WO2016019920A1

WO2016019920A1 - Expansion fastening connection structure and connection method, and expansion fastening connection assembly

Info

Publication number: WO2016019920A1
Application number: PCT/CN2015/086420
Authority: WO
Inventors: 杨东佐
Original assignee: 杨东佐
Priority date: 2014-08-08
Filing date: 2015-08-07
Publication date: 2016-02-11

Abstract

An expansion fastening connection structure and connection method, and an expansion fastening connection assembly. The expansion fastening connection structure comprises an expansion fastening connection assembly, and connected pieces. The expansion fastening connection assembly comprises a driving core piece, and an expansion sleeve consisting of expansion pieces. Tapered surfaces for expansion are provided on the expansion pieces. A driving tapered surface is provided on the driving core piece. The expansion pieces comprise positioning holding portions and holding convex portions. The positioning holding portions on the expansion sleeve only form an independent ring disconnected at an expansion piece linking position, and the holding convex portions on the expansion sleeve only form an independent ring disconnected at the expansion piece linking position. When the expansion sleeve is in a fully expanded state, the connected pieces are held in the axial direction by the positioning holding portions on one side and by the holding convex portions on the other side, and the expansion sleeve connects and fixes the more than two connected pieces together. The advantages of the present invention are that a connection will not fail even in adverse situations such as those having an especially large load, or especially heavy vibrations, and a reliable connection is ensured.

Description

Expansion fastening connection structure and connection method, expansion fastening connection assembly

Technical field:

The invention relates to an expansion fastening connection structure and a connection method, an expansion fastening connection assembly, and a detachable mechanical static connection, which can replace two or more objects mechanically and statically, such as a screw connection and an expansion screw connection. High requirements and harsh environments on key parts of aircraft, ships, equipment, aerospace equipment, aircraft carriers, spacecraft, rockets, engines, nuclear reactors, trains, high-speed rail, railroad tracks, steel structures, steel bridges, automobiles, etc. Or an expansion joint structure and a connection method for connecting mechanical parts with a large load, and an expansion fastening joint assembly.

Background technique:

The existing detachable mechanical static joints are generally threaded connections, keyed connections, pinned connections, expanded screw connections, etc., the most widely used being threaded connections.

The threaded connections need to be tightened. The connection force between the threaded nut and the bolt is mainly manifested by the static friction generated by the pre-tightening force when tightening the thread and the bolt. Therefore, for the threaded connection of key objects, the preload force must be controlled to ensure the reliability of the work.

Referring to the analysis of the article "Invalidation and Cause Analysis of Threaded Connections" published by Lian Zuzu, the failure form and cause analysis of the threaded connection are as follows:

One is the failure of the threaded connection due to excessive load. When the threaded bolts and nuts are tightened, the bolts are stretched due to the tensile force, causing the threads near the nut bearing surface to be subjected to a large load, and the compressive load on the nut also produces the same load concentration. When the external load increases, the bolt continues to elastically elongate, the compression deformation of the joint is reduced correspondingly (ie, the tightening force is reduced), or even disappears; or because the bolt elongation (strain) exceeds the elastic limit, permanent due to plastic yielding Deformation, which reduces the pre-tightening force, resulting in connection failure (distortion, breakage, loss of tightness, etc.).

The second is the failure of the threaded connection caused by common fatigue damage. The threaded connection is subjected to an alternating load and the pre-tightening force in the connection causes the connection to be loose. When the cyclic alternating load acts on the bolts that are only connected, the bolts are fatigue cracked or even broken due to the large alternating stress. Fatigue failure usually occurs in areas where stress concentration is severe, such as: screw head, thread closing end, thread at the screw support plane, and transition corners of the screw.

The third is the creep that causes the threaded connection to fail at high temperatures. Creep refers to the slow plastic deformation of a metal material over a long period of time under constant temperature and constant stress. Creep can occur at stresses that are less than the yield limit of the material. At low temperatures, the creep is not obvious, and only when a certain temperature (about 3/10 of the melting temperature of the material) is reached becomes significant. Creep can cause failure of the threaded connection at high temperatures. In order to eliminate creep, compensation measures are taken when the connection is assembled at room temperature, such as increasing the preload, or pre-tightening the bolts.

Fourth, fretting wear causes failure of the threaded connection. Fretting wear is caused by a surface that is subjected to heavy loads and with little relative motion on the other surface. Threaded connections that carry vibration are most susceptible to fretting wear.

The existing anti-loosening of the threaded connection is to prevent loosening by using additional static friction force, such as adding a spring washer, or using the top effect of the two nuts in the case of low speed heavy load, that is, the top nut is loosened, or in the nut. Embedding with nylon ring, etc.; second, using special anti-loose components, or materials such as anti-loose glue; third is the most important anti-loose method, which is to improve the tensile strength of bolts and nuts, from 4.9, 8.8, 10.9, Levels 12.9 and 14.9 have been continuously improved. Although there are many ways to improve the connection effect of the threaded connection, the connection between the objects relies on static friction, which cannot fundamentally solve the failure of the above-mentioned threaded connections, such as screw breaking, broken ends, thread crushing and shearing. , after the wear of the slider, etc.

The mechanical static connection between objects has some bolts broken at key parts, safety problems caused by failure of threaded connections and safety accidents. It is often encountered in the world, and it is also a common problem faced by technicians in the field. Unresolved issues. Small bolts, large accidents, and frequent major accidents due to bolt breakage, such as the collapse of the connecting rod bolts of the engine of the automobile; the accident of 1 death and 4 injuries caused by the break of the bolts of Harbin tower crane on April 18, 2009; Taiwan's media reported that the No. 1 reactor of the No. 2 Plant of the Nuclear Power Plant detected 7 anchor bolt breaks and damages that may cause nuclear safety accidents; the guidance of the No. 5 cockpit support system occurred at 16:45 on June 29, 2012 Fatigue fracture of stud bolts caused a serious safety accident in which 6 people were killed and 10 people were injured in the "Space Trek" entertainment project in OCT East Shenzhen. As a representative manufacturer of high-end vehicles, the BMW engine was broken due to technical problems that could not solve the screw break. The loss of power and flameout at the moment of the break led to the recall of 230,000 vehicles (BMW (China) Automobile Trading Co., Ltd., BMW Brilliance Automotive Co., Ltd. decided to recall 230,000 vehicles since June 18, 2014), and the manufacturers were greatly affected. Economic losses and loss of goodwill, more serious, will result in the safety of the owner's life and property, etc. There are many safety accidents caused by the failure of threaded connections every year in the world, and the examples are numerous.

The existing expansion screw is composed of a screw and an expansion tube, and the tail of the screw is conical, and the outer diameter of the cone is larger than the inner diameter of the expansion tube. When the nut is tightened, the screw cone moves toward the expansion tube, and the conical portion is moved by the axial movement of the thread, thereby forming a large positive pressure on the outer circumferential surface of the expansion tube to deform the expansion tube, and the deformation portion and the connecting object are inflated. Therefore, friction is self-locked between the connected objects, thereby achieving a fixing effect. The fixing of the expansion thread connection is to use the wedge-shaped inclination to promote the expansion to generate static friction, and achieve the fixing effect. Generally, it is used for fastening the protective fence, awning, air conditioner and the like on the inconvenient tapping material such as cement and brick; Its fixing is not very reliable. If the load has a large vibration, looseness may occur. Therefore, it is not recommended to install a ceiling fan. The expansion screw is generally not used for the connection of mechanical parts.

In the utility model patent No. 92205294.8, a multifunctional expansion bolt for fastening members or as a built-in nut is disclosed, which is composed of an expansion plug body, an expansion core rod and a punching rod; the upper part of the expansion plug body There is a cap; the end of the expansion plug has a cross-shaped slit; the center of the expansion plug has a cylindrical threaded core hole, and the punch rod is threaded or unthreaded. The expansion fastening connection structure comprises a light blind hole on the connection portion of the female body, an optical through hole on the attachment portion of the attachment body, and the optical expansion hole of the expansion plug body extending through the optical through hole on the attachment portion of the attachment body to the connection portion of the female body Inside, when the punching rod is struck along the core hole, the expansion core rod is pushed into the wall, and the tail end is expanded, and the expansion plug body connects the female body connecting portion and the attached body connecting portion. The connection method of the expansion fastening structure comprises: when the punching rod is struck along the core hole, pushing the expansion core rod into the wall, the tail end is expanded, and the fastening function can be used; or the embedded nut can be embedded as a built-in nut In the wall, screwing into different shapes of the screw can be used for different mounting and fixing functions. The disassembly method of the expansion fastening structure includes: if the multi-purpose expansion bolt needs to be removed, only the expansion core rod is punched over the tail end of the expansion plug body, and then the expansion plug body is pulled out by the pull pin, and when disassembled, Simply drill the cap with a drill. The expansion bolt of this structure is embedded in the mother body by the deformation of the tail end of the expanded expansion plug. The expansion screw, expansion fastening structure and connection method of the patent mainly have the following disadvantages: First, the hardness of the material of the matrix is much lower than the hardness of the material of the expansion plug, and the tail end of the expansion plug can be embedded. In the mother body, the scope of use is limited. It is suitable for the fastening installation of the brick, tile, cement, wood structure and other inconvenient tapping components or the use of the insert nut. It is not suitable for the connection of mechanical parts, especially metal mechanical parts. Mainly relying on the expansion and deformation of the tail end of the expansion plug to generate a large radial static pressing force on the inner wall of the mother wall hole, the static friction force generated by the radial pressing force and the resisting force after the deformation of the tail end of the expansion plug will expand. The plug body, the mother body and the appendage body are connected together to achieve the purpose of preventing loosening; since the inner diameter of the wall hole pre-drilled in the mother body is usually matched with the diameter of the expansion plug body, the amplitude of the expansion end of the expansion plug body can be expanded. The amount is small, and the static friction force generated by the radial pressing force with the inner wall of the wall hole of the mother body exists only in the tail end section of the expansion plug body; when the load is large or used for vibration, the expansion plug body and the mother body A small amount of sliding friction occurs between the walls of the hole. As the time increases, the amount of sliding increases, and there is a possibility that a safety accident may occur due to the loosening of the expansion bolt, or the expansion plug is subjected to a large axial direction. When the load is applied, the tail end of the expansion plug will be deformed under the force of the mother body, so that the static friction force between the tail end of the expansion plug body and the mother body and the resisting force after the deformation of the expansion plug body are greatly reduced, so the expansion plug body is subjected to Under the action of a large axial force, the static friction between the tail end of the expansion plug and the mother body and the resisting force after the deformation of the tail end of the expansion plug body are pulled out, and the expansion plug body is pulled out from the mother body, resulting in easy failure; The expansion bolt of this structure is not suitable for occasions with large load or large vibration. It is not suitable for the case where the expansion bolt installed under the parent body is subjected to a large axial load, and it is not recommended. The expansion bolt is used to fasten the ceiling fan and the like; the third is that although the expansion bolt is detachable, the expansion core rod needs to be rushed over the tail end of the expansion plug body, and then the expansion plug body is pulled out by the pin puller. When unloading, it is only necessary to drill the cap with an electric drill; on the one hand, the disassembly is troublesome, on the other hand, the expansion bolt is completely destroyed after disassembly, and can not be reused, especially because the end of the expansion plug is deformed by the expansion more than the parent body. Holes, which can seriously damage the mother when disassembled.

Patent No. 201220208899.2 discloses an expansion screw comprising a screw (1), a wedge nut (2) and a decorative sleeve (6). The screw (1) is provided with a wedge sleeve (5) and a wedge nut. (2) The wedge sleeve (5) and the wedge nut (2) are provided with two half jackets (3) opposite to each other, and a spring (4) is wound between the two half jackets (3). The structure of the expansion fastening structure, the two half-shells are completely installed in the mother body, through the tapered portion of the wedge sleeve through the attachment body, and then through the screw sleeve through the tapered sleeve and the wedge nut fixed to connect the attachment body to the parent body Together. The connecting method and the disassembling method of the expansion fastening structure include the following steps: drilling a hole as large as a cylindrical outer casing on a wall or a ground, inserting the expansion screw into the prefabricated hole, because the triangular wedge on the wedge nut is two and a half When the jacket is tightened, when the screw is tightened, the wedge nut is close to the wedge sleeve, and the two half sleeves are opened and the prefabricated hole is expanded to achieve the purpose of fastening; when the screw is loosened, the wedge nut is away from the wedge sleeve, and the two half jackets are The expansion screw can be removed by shrinking together under the action of the spring. The expansion screw, expansion fastening structure and connection method of the patent, although the expansion screw and the mother body are not damaged during disassembly, still have the following disadvantages: First, the connection force between the two half jackets and the mother body is still inflated. Tightening friction, The connection force between the attached body and the mother body is the pre-tightening static friction force between the screw and the wedge nut, so the force in the axial direction is small, the disadvantage of the thread connection is reflected at any time; the second is the two-semi-sheath in the mother body Cannot be positioned axially inside.

Patent No. 201210245807.2 discloses a method for opening a wall hole fixing object on a building and an expansion bolt and a special cooker used in the method. The method mainly comprises the following steps: drilling a blind according to a conventional method Hole; use a special cookware to pry the reaming hole with a diameter larger than the diameter of the blind hole at the bottom of the blind hole and form a stepped surface; the expansion bolt is inserted into the blind hole; the fixed object is installed; after the washer is put on, the nut is tightened with a wrench. During the tightening process, the tail of the screw gradually presses the flap of the tail of the expansion sleeve to gradually bend outward, and finally forms a flange which is hooked to the step surface. The invention patent, although the sliding static friction force generated by the radial pressing force between the flap of the expansion sleeve and the concrete is changed into the axial resistance of the valve to the concrete, by thickening the thickness of the flap, further The method of improving the anti-dropping performance of the expansion bolt and preventing the object from falling, the method for opening the wall hole fixing object on the building and the expansion bolt and the special cooking utensil used in the method have the following disadvantages: First, the expansion sleeve tail portion The flap is formed by the deformation and the reaming, and cannot be precisely matched with the reaming. In particular, the flap of the tail of the expansion sleeve is in line contact with the reaming, and the position of the flap at the end of the expansion sleeve and the reaming line are generated. A large stress concentration causes the breakage at this point, and the expansion sleeve cannot be made into a high strength and is easily broken due to the need for deformation, and therefore the sliding static friction force generated by the radial pressing force between the flap of the expansion sleeve tail and the concrete It becomes the axial resistance of the valve to the concrete, but the fixing is still very unreliable; the second is to ream the hole in the building, the building is made of concrete material, and the tail of the expansion sleeve The large stress generated by the line contact position of the flap causes the concrete to fall off, and a large axial gap is easily generated between the parent body, the attached body and the expansion bolt, which seriously affects the fixing effect; the third is between the attached body and the parent body. The connection force or the threaded connection pre-tightening static friction, the shortcomings of the threaded connection will be reflected at any time.

Patent No. 201120031423.1 discloses a rapid expansion anchor bolt, and a plurality of outer sleeve anti-skid projections are arranged on the outer sleeve tensioning blade, and the anti-slip projection only acts to increase static friction, and there is no The function of the resistance is also a threaded connection with all the disadvantages of the threaded connection.

Summary of the invention

The technical problem to be solved by the present invention is to overcome the problems in the threaded connection technology of the detachable mechanical static joint which is widely used in the world. That is, ordinary screws and ordinary bolts rely on static friction to connect objects together. Expansion bolts and expansion rely on static friction, or rely on the deformation of the expansion sleeve to resist the connection of objects, so that the load is large, especially the axial load is large or In the harsh situation such as large vibration or high temperature or high and low temperature cross change, the connection of the above structure is liable to failure and cause an accident.

In order to solve the above technical problems, the present invention provides an expansion fastening joint assembly, an expansion fastening connection structure and a connection method, which are connected to two or more connected members by a monolithic structure in the axial direction, and rely on surface and surface resistance. The force connects two or more connected parts together, even if the load is particularly large, especially the axial load is particularly large, or the vibration is particularly large, or the high temperature or high temperature cross change changes, the connection will not fail, the connection is very reliable.

An expansion fastening connection structure embodying the present invention includes an expansion fastening connection assembly and two or more connected members; and a through hole is disposed on the connected member;

The expansion fastening connection assembly comprises a drive core member and two or more expansion members; the expansion member constitutes an expansion sleeve for holding the drive core member;

Providing an expansion cone for driving the expansion sleeve to expand on each of the expansion members;

a driving core member accommodating space is disposed in the expansion sleeve, and the expansion cone surface is disposed on the wall of the driving core member accommodating space;

Providing a driving cone surface on the driving core member that cooperates with the expansion taper on each of the expansion sleeves;

The utility model is characterized in that: the expansion member comprises an expansion member body, a positioning abutting portion radially protruding from one end of the expansion member body, a resisting convex portion protruding radially at the other end of the expansion member body; positioning the resisting portion to the expansion member shaft The distance of the heart is greater than the distance from the convex portion to the axis of the expansion body;

The positioning resisting portion on the expansion sleeve forms only one ring of independent ring that is broken at the joint position of the expansion member, and the abutting protrusion portion on the expansion sleeve forms only a ring of independent ring that is broken at the joint position of the expansion member;

The driving core member is installed in the driving core member accommodating space, and the expansion sleeve is provided with one end of the protruding convex portion passing through the through hole of all the connected members, and the positioning resisting portion of the expansion sleeve radially protrudes the through hole of the connected member, and The abutting convex portion of the expansion sleeve protrudes axially from the connecting member, and the expansion member body is installed in the through hole of the connected member; in the fully expanded state of the expansion sleeve, the convex portion is radially protruded and connected The through hole of the piece resists the axial direction of the connected piece through the surface abutting surface, and the side of the connecting piece facing the positioning abutting portion is axially resisted by the positioning resisting portion, and the side of the connecting piece facing the resisting convex portion The expansion sleeves are axially resisted by the abutting projections, and the expansion sleeves are connected and fixed together by two or more connected members.

As an improvement of the first embodiment, the outer peripheral surface of the expansion member body is a cylindrical curved surface, and the positioning resisting portion is formed to protrude radially along the outer peripheral surface of the one end portion of the expansion member body, and the outer periphery of the convex portion along the other end portion of the expansion member body is resisted. The surface is radially convexly formed; the outer diameter of the outer peripheral surface of the expansion member body is equal to or smaller than the diameter of the through hole of the connected member; and the outer circumferential surface of the corresponding expansion member body on the expansion sleeve is distributed in the same state in the fully expanded state of the expansion sleeve On the circumferential surface, the hole wall of the circular hole on the parent member is tightly fitted by the surface-to-surface contact or uniformly with the hole wall of the circular hole on the parent member, and the outer peripheral surface of the resisting convex portion is distributed on the same circumferential surface, and the positioning resisting portion is positioned. The outer peripheral surface is distributed on the same circumferential surface, and the outer peripheral surface of the protruding convex portion, the expansion member body and the positioning resisting portion are concentric, and the resisting convex portion is formed on only one ring of the ring in which the adjacent two expansion members are coupled, and the positioning is resisted. The portion forms a ring of only one turn that is broken at the joint position of the adjacent two expansion members. The expansion member of the structure is convenient to process and has a simple structure; the expansion sleeve and the connected member have good matching effect, and the bearing effect is good, and can withstand greater axial load.

As a modification of the first embodiment, in the state in which the expansion sleeve is fully expanded, the outer circumferential surface of the corresponding expansion member body on the expansion sleeve is distributed on the same circumferential surface, and the hole wall of the circular hole on the parent member is tightly matched by the surface-to-surface contact or The hole wall of the round hole on the parent member is uniformly gap-fitted. The outer peripheral surface of the corresponding expansion member body on the expansion sleeve is distributed on the same circumferential surface, and on the one hand, it can be tightly matched with the surface of the hole of the circular hole on the female member through surface-to-surface contact; more importantly, the wedge-shaped resisting portion can be completely or circumferentially Uniformly enters into the wedge-shaped abutment groove to maximize the contact area between the wedge-shaped abutting portion and the wedge-shaped abutting groove, so that the axial force that the expansion sleeve can bear is maximized. The hole wall of the circular hole on the structural parent member is tightly matched by the surface-to-surface contact or uniformly with the hole wall of the circular hole on the parent member, which means an ideal state, and there may be a little bit in the presence of machining errors and assembly errors. deviation.

As an improvement of the first solution, a wave spring or an elastic washer which is sleeved on the expansion body of the expansion sleeve and eliminates the axial gap is installed, and the wave spring or the elastic washer is installed between the positioning abutting portion and the connected member, and/or resists Between the convex portion and the connected member. The wave spring or the elastic washer can eliminate the axial gap between the positioning resisting portion on the expansion sleeve and the connected member, and resist the error between the convex portion and the connected member due to the cooperation requirement or the processing error, so that the expansion sleeve is connected The parts have no axial clearance and the connection effect is better.

As an improvement of the first solution, the utility model further comprises a rigid washer sleeved on the expansion body of the expansion sleeve, the rigid washer is installed between the positioning abutting portion and the connected member, and/or between the resisting portion and the connected member, the rigid washer The thickness of the sleeve is matched to the axial distance between the positioning abutting portion of the expansion sleeve and the opposite surface of the abutting projection and then subtracts the sum of the thicknesses of the two or more connected members to be joined. When the expansion fastening joint assembly is designed as a standard part, when a certain type of expansion fastening joint assembly is selected, the axial distance between the positioning resisting portion of the expansion sleeve and the opposite surface of the resisting convex portion is fixed. The thickness of the two or more connected members is varied, and a rigid washer is added, and the expansion sleeve can be designed as a standard member. When the wave spring or the elastic washer for eliminating the axial gap is not disposed on the expansion body of the expansion sleeve, the axial distance between the positioning abutting portion of the expansion member and the opposite surface of the resisting convex portion is greater than or equal to two connected to be connected. The expansion member of the sum of the thicknesses of the above connected members does not need to be a rigid washer when it is equal to, and a rigid washer is added when it is larger than the thickness of the rigid sleeve. The thickness of the rigid sleeve is equal to the axis between the positioning resist of the expansion sleeve and the opposite surface of the resisting projection. The distance is further subtracted from the sum of the thicknesses of the two or more connected members to be joined. When the wave spring or the elastic washer for eliminating the axial gap is sleeved on the expansion body of the expansion sleeve, the axial distance between the positioning resisting portion of the expansion member and the opposite surface of the resisting convex portion is greater than or equal to two or more connections to be connected. The thickness of the expansion member plus the thickness of the connected member plus the thickness of the wave spring or the elastic washer is equal to the need to add a rigid washer. When it is larger, the rigid washer is added. The thickness of the rigid washer is equal to the positioning resisting portion and the resisting convex portion of the expansion sleeve. The axial distance between the opposing faces is subtracted from the sum of the thicknesses of the two or more connected members to be joined, and the thickness of the wave spring or the elastic washer is subtracted.

As an improvement of the fifth option, the specification of the thickness of the rigid gasket includes one unit length, two unit lengths, and five unit lengths. The specification of the thickness of the rigid washer includes one unit length, two unit lengths, and five unit lengths, so that the axial distance between the positioning resisting portion of the expansion sleeve and the opposite surface of the resisting convex portion is fixed, regardless of the two The above needs to be changed by the thickness of the connected parts, and the combination of rigid washers of different specifications can meet the needs.

As an improvement of the first aspect, a guide portion is provided on a side of the abutting convex portion toward the connected member. During the expansion of the expansion sleeve, the guiding portion on the convex portion is more favorable for resisting the radial direction of the convex portion toward the surface of the connected member and smoothly resisting the axial direction of the connected member through the through hole of the connected member, thereby reducing the processing of the expansion member. Precision.

As an improvement of the first solution, the driving core member comprises a driving core rod, and the driving core rod is provided with a driving cone surface; the driving core rod further comprises a straight light rod portion connected to the big end of the driving cone surface, wherein the axial length of the straight light rod portion is greater than The axial length of the driving cone surface; in the fully expanded state of the expansion sleeve, there is a set distance between the driving cone surface on the driving core rod and the corresponding expansion cone surface on the expansion sleeve in the axial direction. During the expansion process of the drive core driving expansion sleeve, the driving taper surface slides along the expansion taper surface; in the fully expanded state of the expansion sleeve, the beginning end of the straight rod portion of the driving core rod passes over the small end of the expansion taper surface to drive the taper surface There is a set distance between the expansion cones on the expansion sleeve in the axial direction. Therefore, it can be set to fully expand in the expansion sleeve. After expansion, the drive core rod continues to slide over a distance on the expansion sleeve. With this structure, in the working state, with the working state of such a structure, even if the driving core rod is partially displaced in a direction opposite to the moving direction in which the driving core rod drives the expansion sleeve to expand, the expansion sleeve will continue to be in an expanded state, thereby being Ensure that the expansion sleeve remains fully expanded in the harsh working environment. That is, it is ensured that the positioning abutting portion and the abutting convex portion are maintained in a state of maintaining the axial direction against the connected member, so that the use is very reliable, and there is no safety accident in which the connection of the expansion fastening connection assembly fails.

As an improvement of the eighth embodiment, in the fully expanded state of the expansion sleeve, the straight light rod portion is tightly fitted with the expansion sleeve at the connection position of the two adjacent connected members. In the connection position of the two adjacent connected members, the straight beam portion of the driving core rod has no clearance fit with the expansion sleeve, and the driving core rod is not deformed by the torque at the connection position, and is installed horizontally side by side for more than two connected members. In the case, the performance of the driving core rod is greatly increased.

As an improvement of the first solution, the driving core member includes a driving core rod; the expansion fastening connection assembly further includes a limiting mechanism, the limiting mechanism is a circlip and a card slot, and the card slot is disposed in the expansion sleeve to cooperate with the circlip; In the fully expanded state, the circlip is installed in the card slot, and the circlip locks the surface of the driving core rod away from the connected member, so that the driving core rod remains at the position where the expansion sleeve is fully expanded. The expansion fastening assembly further includes a limiting mechanism that completely ensures that the driving core member is in a fully expanded state of the expansion sleeve during use, thereby completely ensuring that the expansion sleeve is fully expanded during use, and the wedge of the expansion sleeve is resisted. The portion is resisted in the wedge-shaped abutting groove of the connected member, and the connection of the expansion and fastening connection assembly to the connected member and the connected member is ensured to be reliable, so that it is foolproof.

As an improvement of the first solution, the driving core member includes a driving core rod and a driving nut threadedly coupled to the driving core rod; the expansion fastening connection assembly further includes a limiting mechanism, the limiting mechanism, the rotating thread portion and the rotation nut structure, and the rotation stop The threaded portion is disposed at an end of the driving core rod protruding from the expansion sleeve; in the fully expanded state of the expansion sleeve, the rotation preventing nut is screwed on the rotation preventing thread portion, and the rotation preventing nut abuts against the end surface of the expansion sleeve to keep the driving core rod in The position of the expansion sleeve is completely expanded.

As a modification of the first embodiment, a corresponding strip is formed at a corresponding position on the expansion member of the valve member to form a driving core receiving space, and a convex taper surface is provided on the protruding strip or the recessed portion of the expanding member; The member is provided with a recess corresponding to the ridge on each of the expansion members, or a rib that cooperates with the recess on each of the expansion members, and a drive cone is provided on the rib or the recess of the drive core. a rib having a taper surface for expansion is provided on the expansion member, and a recessed portion with a driving taper surface is disposed on the drive core member, and the hole diameter of the through hole on the two or more connected members is constant. The rib on the expansion member is equivalent to the addition of the rib, thereby greatly increasing the axial load that the expansion sleeve can bear; the drive core member is provided with a rib with a driving cone surface, and the expansion member is provided with a cone for expansion The concave portion of the surface can greatly increase the thickness of the expansion member when the diameters of the through holes of the two or more connected members are constant, thereby greatly increasing the axial load that the expansion sleeve can bear.

Axial load to be subjected to.

As an improvement of the first solution, the driving core member comprises a driving core rod or a core rod, and the driving core rod or the core rod is provided with a limit state in which the expansion sleeve is fully expanded, and the expansion sleeve axially resists the axial direction against the expansion sleeve. Convex. A limiting protrusion is arranged on the driving core rod or the core rod, and on the one hand, the expansion fastening joint assembly can be installed in the correct position without the need of technology, and the expansion sleeve can be ensured to be in a fully expanded state, and on the other hand, the expansion sleeve can be completely completed. After expansion, it is ensured that there is a set distance between the drive taper on the drive mandrel and the corresponding expansion taper on the expansion sleeve in the axial direction.

As an improvement of the first solution, the expansion fastening assembly further includes a cap; the cap includes an inner cavity, a buckle is protruded from a bottom surface of the inner cavity; a resisting groove is provided on the expansion sleeve or the driving core; and the expansion sleeve is fully expanded. The cap is fastened to the abutment groove by a snap fit to the expansion sleeve or the drive core member, and the expansion sleeve protruding from the connector or the expansion sleeve and the drive core protruding from the connector are housed in the cap Inside the cavity.

As an improvement of the first solution, the expansion fastening assembly further includes a cap; the cap includes an inner cavity, a protrusion on the bottom surface of the inner cavity, a threaded hole in the protrusion; and a convex expansion sleeve on the driving core The threaded portion of the cap is screwed onto the driving core rod, and the expansion sleeve protruding from the connecting member or the expansion sleeve and the driving core member protruding from the connecting member are housed in the inner cavity of the cap. The cap is provided to cover the expansion sleeve and the driving core member, and the appearance is not only beautiful, but also dustproof, waterproof, anti-sunlight, etc., which greatly reduces the damage of the expansion fastening component to the external environment, and greatly improves the expansion tightness. Connection reliability and service life of solid connection components. Caps can be placed only on the side facing the environment, such as outdoors. If the environment on both sides is bad, caps should be provided on both sides.

A connection method for an expansion fastening structure, the connection method comprising:

Providing an expansion fastening assembly comprising a drive core member and two or more expansion members; the expansion member forming an expansion sleeve for holding the drive core member;

Providing two or more connected members that need to be coupled, and having through holes on the connected members;

The expansion member includes an expansion member body, a positioning abutting portion radially protruding from one end of the expansion member body, and a resisting convex portion radially protruding at the other end of the expansion member body;

The driving core member is installed in the driving core member accommodating space, and the expansion sleeve is provided with one end of the protruding convex portion through the through hole of all the connected members, and the positioning resisting portion of the expansion sleeve radially protrudes the through hole of the connected member And being connected to resist positioning, the resisting protrusion of the expansion sleeve protrudes axially from the connecting member and is axially resisted by the connecting member, and the expanding member body is installed in the through hole of the connected member; the driving core member drives the expansion sleeve to expand, The radial movement of each of the expansion members resists the convex portion radially protruding from the through hole of the connecting member, and the abutting convex portion abuts against the axial direction of the connected member through the surface and the surface, and the side of the connecting member facing the positioning resisting portion is The positioning resisting portion axially resists, and the side of the connecting member facing the resisting convex portion is axially resisted by the resisting convex portion;

The expansion sleeve secures the two or more connected members together.

As a modification of the sixteenth embodiment, after the expansion sleeve is fully expanded, the expansion sleeve no longer moves in the radial direction and remains in the fully expanded state, and the driving core rod continues to move to the set position relative to the axial direction of the expansion sleeve.

As an improvement of the sixteenth embodiment, the expansion cone for driving the expansion sleeve is provided on each of the expansion members; the driving core housing space is disposed in the expansion sleeve, and the expansion cone is disposed in the driving core housing space a drive cone on the drive core member that cooperates with the expansion taper on each of the expansion sleeves; during the expansion of the drive core member to drive the expansion sleeve, the drive cone faces slide along the expansion cone to drive Each flap expands radially.

As a modification of the sixteenth aspect, the driving core member comprises a driving core rod, and the driving core rod is provided with a driving cone surface; the driving core rod further comprises a straight light rod portion connected to the large end of the driving cone surface, and the axial length of the straight light rod portion Greater than the axial length of the drive cone;

After the driving core member drives the expansion sleeve to fully expand, the driving core member continues to move, and the end portion of the driving straight rod portion of the driving rod and the large end of the driving cone surface continues to move to the set position beyond the small end of the expanding tapered surface.

As an improvement of the sixteenth aspect, the expansion fastening structure further comprises a limiting mechanism; the driving core member drives the expansion sleeve to expand, and the expansion sleeve completely expands when the expansion sleeve no longer generates radial movement; and the driving core member is fully expanded in the expansion sleeve. Stop the movement or continue the movement to the set position, and then install the upper limit mechanism; the limiting mechanism limits the surface of the driving core rod away from the connected member, so that the driving core rod keeps the position of the expansion sleeve fully expanded.

As a modification of the sixteenth aspect, the driving core member comprises a driving core rod, a driving nut matched with the driving core rod; the driving core rod comprises a small rod provided with a thread, and a first driving cone formed by the driving cone surface connected to the small end end a first straight light rod portion connected to the big end of the first driving cone; the driving core housing accommodating space further includes a nut accommodating groove matched with the driving nut; the driving nut is installed in the nut accommodating groove to drive the core rod The small rod extends into the driving nut and cooperates with the driving nut thread, and the driving core rod is installed in the expansion sleeve;

The positioning resisting portion of the expansion sleeve is axially resisted by the connecting member, and the rotary driving core rod moves the first driving cone toward the axial direction of the driving nut, and the driving nut has no axial movement, the first driving cone and the expansion sleeve The expansion slides relative to the cone and the expansion sleeve expands.

As a modification of the sixteenth aspect, the driving core member includes a driving core rod including a small end of the light rod, a driving cone which is connected to the small end and cooperates with the expansion cone surface in the expansion sleeve, and is formed by the driving cone surface, a straight light rod portion connected to the big end of the driving cone, connected to the straight light rod portion and radially protruding from the resisting portion of the straight light rod portion, and a thread portion connected to the resisting portion;

The driving core rod is tapped into the expansion sleeve, the positioning resisting portion of the expansion sleeve is axially resisted and positioned by the connecting member, the expansion sleeve has no axial movement, the driving cone and the expansion sleeve expand relative to the tapered surface, and the expansion sleeve expands. The resisting portion of the driving core rod is resisted by the expansion sleeve, and the driving core rod is mounted in position.

As a modification of the sixteenth aspect, the driving core member includes a driving core rod, a driving nut that cooperates with the driving core rod; the driving nut includes a driving cone formed by the driving cone surface, and a threaded hole disposed at the axial center position; the driving core rod includes a small end of the threaded portion that cooperates with the threaded hole of the drive nut, and is connected to the small end and cooperates with the expansion cone in the expansion sleeve, and the driving cone formed by the driving cone surface is connected to the big end of the driving cone a straight light rod portion connected to the straight light rod portion and radially protruding from the resisting portion of the straight light rod portion; the small rod driving the core rod is threadedly fitted with the driving nut, and the driving nut is installed in the driving core member receiving space;

The positioning resisting portion of the expansion sleeve is axially resisted by the connecting member, and the expansion sleeve has no axial movement. The driving nut is screwed with the driving core rod, and the driving core rod is rotated to drive the driving nut and the driving cone to synchronously move relative to each other. The expansion of the body and the expansion sleeve is relatively slid with the tapered surface, and the expansion sleeve is expanded; the abutting portion of the driving core rod is resisted by the expansion sleeve, and the driving core rod is mounted in position.

As a modification of the sixteenth aspect, the driving core member comprises a core rod, a driving nut and a driving member; the core rod comprises a core rod body provided with a threaded end, a core rod resisting portion radially protruding from the core rod body and away from the threaded end; driving The nut comprises a nut body, and the driving cone surface is arranged on the nut body; the driving component comprises a driving component body, the through hole of the driving component body is axially penetrated, and the driving cone surface is arranged on the driving component body;

a threaded end of the core rod passes through a through hole in the driving member, the core rod resisting portion axially abuts the driving member, and the threaded end of the core rod is screwed with the threaded hole of the driving nut;

The positioning resisting portion of the expansion sleeve is axially resisted by the connecting member, and the expansion sleeve has no axial movement, and the threaded end of the core rod is threadedly engaged with the threaded hole of the driving nut, and the rotating core rod makes the driving nut and the driving member synchronously Movement, the driving cone on the driving member slides relative to the expansion on the expansion sleeve, and the expansion sleeve expands; the resisting portion of the driving core rod is resisted by the expansion sleeve, and the driving core rod is mounted in position.

As a modification of the sixteenth aspect, a rigid washer sleeved on the expansion body of the expansion sleeve is further included;

The connection method also includes:

Provide a rigid gasket;

The expansion member is selected according to the sum of the thicknesses of the two or more connected members to be connected, and the axial distance between the positioning resisting portion of the expansion member and the opposite surface of the resisting convex portion is greater than or equal to two or more connected members to be connected. The sum of the thicknesses;

When the axial distance between the positioning resisting portion of the expansion member and the opposite surface of the resisting convex portion is greater than the sum of the thicknesses of the two or more connected members to be connected, according to the positioning resisting portion of the expansion sleeve and the opposing surface of the resisting convex portion Selecting the thickness of the rigid gasket by subtracting the sum of the thicknesses of the two or more connected members to be joined;

A rigid gasket is mounted between the positioning abutment and the connected member, and/or between the convex portion and the connected member.

As an improvement of the twenty-fifth aspect, the specification for providing the thickness of the rigid gasket includes one unit length, two unit lengths, and five unit lengths;

Selecting a thickness of rigid washer or a rigid washer of different thickness according to the axial distance between the positioning resisting portion of the expansion sleeve and the opposite surface of the resisting convex portion minus the thickness of the two or more connected members to be joined The combination.

An expansion fastening assembly comprising a drive core member and two or more expansion members; the expansion member forming an expansion sleeve for holding the drive core member;

Providing a driving cone on the driving core member that cooperates with the expansion taper on each of the expansion sleeves;

Each of the expansion members includes an expansion member body that cooperates with two or more holes in the connected member, and is provided at one end of the expansion member body for axially positioning the expansion sleeve, for resisting the fixed member, and radially protruding a positioning abutting portion of the expansion member body, and at the other end of the expansion member body, a resisting convex portion for abutting and fixing the connected member and radially protruding the expansion member body;

The maximum distance between the positioning abutting portion and the axis of the expansion body is greater than the maximum distance from the convex portion to the axis of the expansion body.

As an improvement of the twenty-seventh aspect, the outer peripheral surface of the expansion member body is a cylindrical curved surface, and the positioning resisting portion is formed to protrude radially along the outer peripheral surface of the one end portion of the expansion member body, and the convex portion is abutted along the other end portion of the expansion member body. The outer peripheral surface is formed to be radially convex; the outer peripheral surface of the expander body has an outer diameter equal to or smaller than the diameter of the through hole of the connected member.

As a modification of the twenty-seventh aspect, the spring further comprises a spring receiving groove radially on the outer peripheral surface of each of the expansion members, and the expansion members of the two or more petals are held together by the spring to form an expansion sleeve, and the spring is completely accommodated. The spring is accommodated in the groove; in the unexpanded state of the expansion sleeve, the expansion cone on the expansion sleeve is hung on the driving cone surface; the positioning resisting portion on the expansion sleeve is circumferentially distributed to form a broken independent ring, and the expansion sleeve is The circumferential distribution of the resisting projections forms a broken independent ring shape. The driving core member is installed in the accommodating space of the driving core member, and then the expansion members of the two lobes or more are assembled by the spring to form the expansion sleeve so as not to be separated, and the expansion fastening assembly is assembled at the factory, and during transportation. It won't spread out, it's more convenient, fast and easy to use.

As an improvement of the twenty-seventh aspect, the driving core member comprises a driving core rod, a driving nut matched with the driving core rod; the driving core rod comprises a small rod provided with a thread, and the first driving formed by the driving cone surface connected to the small end end a cone, a first straight rod portion connected to the big end of the first driving cone; a driving core housing accommodating space in an unexpanded state of the expansion sleeve, a small rod for driving the core rod, a first driving cone, and a first straight rod portion The driving core housing accommodating space further comprises a nut accommodating groove matched with the driving nut; the driving nut is installed in the nut accommodating groove, and the small rod of the driving core rod extends into the driving nut and cooperates with the driving nut thread to drive the core rod Installed in the expansion sleeve. When the core rod is rotationally driven, the positioning abutting portion of the expansion sleeve is axially resisted by the connecting member, and the expansion sleeve has no axial movement, and the driving core rod causes the first driving cone to generate axial movement toward or away from the direction of the driving nut. The driving core rod causes the first driving cone to generate an axial movement toward the driving nut, and the first driving cone of the driving core rod and the expansion cone of the expansion sleeve slide relative to each other, and the expansion sleeve expands. Compared with the overall threaded connection structure, the connection force is the axial abutting force of the abutting portion of the expansion sleeve against the connected member and the axial abutting force of the positioning portion of the expansion sleeve against the connected member. The drive mandrel is not directly connected to more than two connected members and is only used to drive the expansion sleeve expansion. The driving core rod has a small force, so although the threaded engagement between the driving core rod and the driving nut is not easy to cause the connection failure of the sliding wire.

As a modification of the thirtieth aspect, the second driving cone formed by the driving cone surface is further included; the driving core rod further includes a connecting cone whose big end is connected to the first straight beam portion, and the second connecting the small end of the connecting cone a straight light rod portion, a small end connected to the second straight rod portion, a second driving cone formed by the driving cone surface, and a third straight rod portion connected to the large end of the second driving cone, the driving core housing space is also The connecting cone, the second straight rod portion, the second driving cone, and a portion of the third straight rod portion cooperate. The expansion fastening assembly of the structure, the first driving cone and the second driving cone on the driving core rod are used to drive the expansion sleeve expansion, and the expansion sleeve expands more evenly due to the expansion mode of the double driving, and the expansion effect is more Ok, so that the connection works better.

As a modification of the twenty-seventh, the driving core member is a driving core rod, and the driving core rod includes a small end of the light rod, and the driving cone formed by the driving cone surface is connected with the small end and cooperates with the expansion cone surface in the expansion sleeve. a straight light rod portion connected to the large end of the driving cone, a resisting portion connected to the straight light rod portion and radially protruding the straight light rod portion, a core member pulling mechanism disposed on the end surface of the resisting portion; and a driving core member in an unexpanded state The accommodating space includes a first accommodating space that cooperates with a small rod driving the core rod, a driving cone, and a part of the straight light rod portion; and further includes limiting a surface of the driving core rod resisting portion away from the connected member to keep the driving core rod A limiting mechanism in which the expansion sleeve is fully expanded. When the connection is realized, the driving core rod is directly knocked into the expansion sleeve to fully expand the expansion sleeve, and the resisting portion limits the position of the driving core rod into the expansion sleeve. The limit mechanism ensures that the drive mandrel remains in the expanded position during operation. When disassembly is required, the limit mechanism is first removed, and the drive core rod is directly pulled out by a tool that cooperates with the threaded portion. The expansion and fastening connection assembly of this structure has a simple structure and low cost.

As an improvement of the twenty-seventh, the driving core member comprises a driving core rod, a driving nut matched with the driving core rod; the driving nut comprises a driving cone formed by the driving cone surface, a threaded hole disposed at the axial center position; the driving core rod The utility model comprises a small end provided with a threaded portion which cooperates with a threaded hole of the driving nut, and a driving cone which is connected with the small end and cooperates with the expansion cone in the expansion sleeve and is formed by the driving cone surface, and is connected with the big end of the driving cone The straight light rod portion is connected to the straight light rod portion and radially protrudes from the resisting portion of the straight light rod portion; in the unexpanded state of the expansion sleeve, the driving core housing receiving space and the driving nut, the small end portion of the driving core rod, the driving cone The partial straight rod portion and the resisting portion are matched; the small rod of the driving core rod is screwed and fitted with the driving nut, and the driving nut is installed in the driving core member accommodating space. The rotary drive core rod can drive the driving cone of the driving core rod and the driving cone of the driving nut to slide relative to the corresponding expansion cone of the expansion sleeve to realize the expansion of the driving expansion sleeve. Since two expansion cones with opposite taper angles are arranged in the expansion sleeve, the two-direction multi-drive expansion is realized, so that the expansion process of the expansion sleeve is more balanced and the expansion effect is better, so that the connection effect is better.

As an improvement of the twenty-seventh, the driving core member comprises a driving core rod; the driving core rod comprises a driving core rod body protruding from the driving core rod body for driving the expansion and contraction expansion and contraction of the expansion sleeve; A driving taper surface for driving the expansion sleeve expansion is disposed on a side of the protruding portion facing away from the positioning abutting portion, and a contracting conical recess portion for contracting the expansion sleeve is formed on a side of the protruding portion facing the positioning resisting portion, and is driven. The driving taper surface on the core rod is aligned with the taper direction of the conical recessed portion for contraction; the driving core member accommodating space includes an expansion and contraction accommodating groove that cooperates with the expansion and contraction projection portion of the driving core rod, and is used for expansion and contraction. The accommodating groove forms a taper surface for expansion corresponding to the driving taper surface of the driving core rod toward the groove wall of the positioning resisting portion, and forms a contracting taper with the driving core rod in the groove wall of the expansion and contraction accommodating groove facing away from the positioning abutting portion The constricted portion of the recessed portion is tapered. The conical recessed portion for contraction and the tapered taper surface are provided. When disassembling, the conical recessed portion of the driving core rod is engaged with the conical taper on the expansion sleeve, so that the expansion sleeve is gathered and the sleeve is expanded. The positioning resisting portion and the resisting convex portion are completely automatically disengaged from the connected member, and the disassembly is easier and more reliable, ensuring that the expansion sleeve is not damaged during the disassembly process.

As a modification of the twenty-seventh aspect, the corresponding position of the driving core receiving space on each of the expansion members is provided with a ridge or a recess, and the convex or concave portion of the expansion member is provided with a tapered surface for expansion; The driving core member is provided with a recessed portion that cooperates with the ridge on each of the inflating members, or a rib that cooperates with the recessed portion of each of the inflating members, and a driving cone is provided on the rib or the recess of the driving core member. surface.

As a modification of the twenty-seventh, the driving core member comprises a core rod, a driving nut and a driving member; the core rod comprises a core rod body provided with a threaded end, and a core rod resisting portion radially protruding from the core rod body and away from the threaded end; The driving nut comprises a nut body, a rib disposed axially on the nut body, axially penetrating the threaded hole of the nut body, and a driving cone surface is arranged on the rib of the driving nut; the driving component comprises a driving body, and the axial direction is arranged at a rib on the driving body body axially penetrates the through hole of the driving body body, and a driving cone surface is arranged on the rib of the driving member; and the first recessed portion is matched with the corresponding rib on the driving nut on the expansion member a second recessed portion that cooperates with a corresponding rib on the driving member; the threaded end of the core rod passes through the through hole in the driving member, and the core rod resisting portion axially resists the driving member, the threaded end of the core rod and the driving nut The threaded hole is threaded; in the unexpanded state of the expansion sleeve, the driving core receiving space cooperates with the connected driving body and the ribs thereon, the core body, the driving nut body and the ribs thereon. Rotating the core rod, the driving cone surface on the rib of the driving member can slide relative to the expansion cone surface of the second recessed portion of the expansion sleeve, thereby driving the driving cone surface on the rib of the nut to the opposite expansion sleeve The expansion of the first recess is slid with a tapered surface such that the expansion sleeve expands. Two expansion cones with opposite taper angles are arranged in the expansion sleeve, and the expansion sleeve is expanded from the double-drive expansion sleeve, the expansion is more balanced, and the expansion effect is better, so that the connection effect is better. The driving core member comprises a core rod, a driving nut and a driving member, and the core rod is convenient to process because the driving cone surface is not provided on the core rod. The drive nut and the drive member can be designed as standard parts with the same structural form except for the central aperture, and the core rod can be directly used in the form of standard bolts, which can greatly reduce the cost by standardization.

As a modification of the twenty-seventh, the driving core member comprises a core rod, a driving nut and a driving member; the core rod comprises a core rod body provided with a threaded end, and a core rod resisting portion radially protruding from the core rod body and away from the threaded end; The driving nut comprises a nut body axially extending through the threaded hole of the nut body, and a driving cone surface is arranged on the driving nut; the driving component comprises a driving component body, the through hole of the driving component body is axially penetrated, and the driving cone is arranged on the driving component The threaded end of the core rod passes through the through hole in the driving member, the core rod resisting portion axially resists the driving member, and the threaded end of the core rod is screwed with the threaded hole of the driving nut; in the unexpanded state of the expansion sleeve, the driving core The accommodating space is matched with the driving member, the core body and the driving nut which are connected together.

As an improvement of the twenty-seventh aspect, the positioning resisting portion is tapered, and a tapered receiving hole that completely accommodates the positioning resisting portion is provided on the connected member near the positioning resisting portion.

The expansion fastening assembly of this structure, on the one hand, expands and fastens the connection assembly without protruding the connector, which is more aesthetically pleasing, and on the other hand eliminates axial play.

As an improvement of the twenty-seventh aspect, the expansion fastening joint assembly further includes a cap; the cap includes an expansion sleeve for accommodating the protruding member, or an inner sleeve for accommodating the expansion sleeve of the connected member and the driving core member, The bottom surface of the inner cavity is convexly provided with a buckle; and the expansion sleeve or the driving core member is provided with a resisting groove matched with the buckle.

As a modification of the twenty-seventh aspect, further comprising a rigid washer sleeved on the expansion member body of the expansion sleeve; between the positioning abutting portion of the expansion member and the expansion member body, and/or between the resisting projection portion and the expansion member body of the expansion member Chamfering or rounding is provided; a chamfer is provided on the rigid washer to cooperate with the chamfer on the expansion member, or a rounding is provided on the rigid washer to cooperate with the rounding on the expansion member.

The chamfering or rounding is provided on the expansion member, which greatly reduces the stress concentration of the expansion sleeve composed of the expansion member, greatly improves the axial connection force of the expansion sleeve composed of the expansion member and the reliability of the connection; and is provided on the rigid washer The chamfering or rounding with it does not need to be chamfered on the connected parts. When the expansion fastening assembly can be designed as a standard part, the processing cost is reduced.

The beneficial effects of the invention are:

First, in the fully expanded state of the expansion sleeve, the side of the connecting member facing the positioning resisting portion is axially resisted by the positioning resisting portion, and the side of the connecting member facing the resisting convex portion is axially resisted by the resisting convex portion, and the expansion sleeve will be two. More than one connected pieces are connected and fixed together.

The expansion fastening structure of the invention ensures that the bearing structure of the bearing structure is a resisting structure between the face and the face, and the connecting force of the expansion fastening connection component and the connected component is mainly an axially integrated expansion member pair The above-mentioned resisting force of the connected member, rather than relying on the pre-tightening static friction of the threaded connection or the expansion static friction of the expansion screw.

The expansion fastening structure of the present invention can withstand very large connection forces. Compared with the threaded connection, there is no axial preload between the expansion sleeve and the two or more connected members, so it can be used in a large load, especially in an environment with large axial load, large vibration, high temperature, etc. It can cause the connection to fail, and it can also avoid the failure of the threaded connection caused by the pre-tightening force being too large or too small due to the non-standard operation.

Compared with the case where the mechanical static connection using the screw and bolt structure is connected by the pre-tightening and the static frictional connection by the connected member, the present invention has the greater advantage of completely overcoming the creep due to excessive load, fatigue damage and high temperature. Several common forms of connection failure caused by fretting wear.

Compared with the use of expansion screws or expansion bolts, it relies only on expansion to generate a large radial static pressing force on the inner wall of the wall of the connecting member, and the static friction force generated by the radial pressing force has greater advantages, and the load is larger. In the case of vibration, the connection will not be broken due to slight sliding friction.

The invention completely breaks the static friction force of the existing screw-connected screw or bolt by the pre-tightening, the mechanical static connection of the expansion screw or the expansion bolt, the expansion static friction force generated by the expansion or the deformation caused by the expansion sleeve deformation. Force to connect the inertial thinking of the object.

Second, the positioning resisting portion and the resisting convex portion of the expansion sleeve are previously processed, rather than being formed by expansion deformation of the expansion sleeve. The expansion sleeve is designed to have two lobes (in which the expansion sleeve has the best effect of three lobes), and the expansion sleeve does not deform during the expansion process. First, the thickness and shape of the positioning resisting portion and the resisting convex portion can be freely according to the force. The design can be subjected to a large external force as needed and the connection is reliable. Secondly, in the unexpanded state of the expansion sleeve, the expansion fastening assembly is placed in more than two connected parts, and the positioning sleeve of the expansion sleeve is convex. The hole in the connected piece is resisted by the connected piece, so the expansion sleeve is completely axially positioned, so that the expansion sleeve moves in the radial direction during the expansion of the expansion sleeve. It is very convenient and easy to install, and does not require special operation skills, which greatly reduces the operator's operation requirements. Moreover, the positioning resisting portion and the resisting convex portion are in surface contact with the connected member to resist each other, thereby greatly reducing stress concentration. Third, the use range is wide. The hardness of the material that does not need to be connected is much lower than the material hardness of the expansion sleeve, and does not require a large friction coefficient between the expansion sleeve and the connected member. It can be used as a substitute for screws or bolts, and can be used for aircraft and ships. , equipment, aerospace equipment, aircraft carriers, spacecraft, rockets, engines, nuclear reactors, trains, high-speed rail, railroad tracks, steel structures, steel bridges, automobiles, etc. are subject to large loads, especially axial loads, or very high The temperature or the hot and cold cross-change temperature, or the connection of mechanical parts of key parts in a working environment such as large vibration. Compared with the existing integral expansion bolt or expansion screw structure with an expansion sleeve structure, such as the invention patent of 201210245807.2, the patent discloses a method for opening a wall hole fixing object on a building and the method The expansion bolt and the special cooker are used by firstly using a special cooker to pry a reaming hole having a diameter larger than the diameter of the blind hole at the bottom of the blind hole and forming a stepped surface, and then driving the tail end of the core rod during the expansion process. The flap of the tail of the expansion sleeve is gradually squeezed to gradually bend outward, and finally a flange that is hooked to the step surface is formed. The expansion bolt adopting such a structure is produced by the deformation of the driving core rod and the reaming and the flange is deformed, and the specific deformation thereof cannot be accurately calculated, so that the flanged fitting after the deformation and the deformation cannot be performed in advance in the connected member. The shape of the reaming, so that the deformed portion of the flange and the reaming is only a fatal defect of the line fit; and the expansion sleeve cannot achieve high-strength heat treatment and hardening, and cannot design and expand on the connected member. The precise fitting of the flange after the expansion of the tail portion and the reaming of the surface of the resisting portion block the technical suggestion of those skilled in the art from the technical solutions disclosed in the patent to realize the technical solution claimed in the patent. An expansion bolt or an expansion screw of the prior art expansion sleeve is a valve structure, such as an expansion screw disclosed in the utility model patent No. 201220208899.2, the two half jackets are mounted on the connected member without axial resistance positioning. During the expansion process, the two half-shells move in the axial direction in the connected member, and the axial resistance of the two or more connected members cannot be achieved, which blocks the patent from those skilled in the art. The disclosed technical solution realizes the technical enlightenment of the technical solution claimed in this patent.

Thirdly, the expansion sleeve and the connected piece will not loosen the wire (will not be reversed and loosened). The connected piece will not be damaged by the threaded sliding wire, and the positioning resisting portion and the resisting convex portion of the expansion sleeve are damaged during the working process. Almost zero, so it is very reliable to connect more than two connected parts by the expansion fastening assembly; the drive core only serves to drive the expansion of the expansion sleeve, not through the fastening connection with the drive core. More than one connected member is fixed to the other connected member, and the force of driving the core member in the fully expanded state of the expansion sleeve is very small, and even if the driving core member is screwed, it is almost impossible to cause the screw connection to fail, so The expansion of the expansion sleeve fully drives the core member and the expansion sleeve to be very reliable, and it is also easy to achieve that the drive core member never falls off and is fixed on the expansion sleeve, thereby realizing the connection of two or more connected members under working conditions. Never fall off.

Fourthly, it is also a very important advantage of the present invention. The expansion member of the present invention has a simple structure, and in particular, it is not necessary to machine grooves, threads, etc. on the connection, which greatly reduces the processing cost. The expansion fastening joint assembly of the present invention can be used in the case where it is required to be fastened by bolts and nuts, and the reliability and the axial load of the expansion joint assembly of the present invention are unmatched by the bolt and nut structure. . Since the expansion sleeve is not deformed during the expansion process, the expansion sleeve is not embedded in the connected member to cause deformation of the connected member, and the expansion sleeve and the connected member have almost no radial connection force, and there is no damage such as thread slip in the working state. The phenomenon of being connected. When disassembling, the drive core member only needs to be disengaged from the expanded position, and the expansion fastening connection assembly can be taken out from the connected member without a large force, and the expansion and fastening connection assembly is not damaged when disassembled, and the damage is not damaged. The connecting member, not only the expansion fastening assembly, can be reused many times, and the connected member is not damaged or scrapped due to damage to the position where the expansion fastening assembly is connected.

Fifthly, in the present invention, the cooperation between the driving taper surface and the expansion taper surface only needs to have the same taper of the driving taper surface and the expansion taper surface to realize the function of driving the core member to drive the expansion sleeve expansion, and the curvature thereof may be different. .

DRAWINGS

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a front elevational view showing an expansion-fastening connection structure according to a first embodiment of the present invention in an unexpanded state of an expansion sleeve.

Fig. 2 is a cross-sectional view taken along line A-A of Fig. 1;

Fig. 3 is a perspective view showing the expansion fastening assembly with a wave spring according to Embodiment 1 of the present invention.

4 is a perspective exploded view of the expansion fastening assembly with a circlip and a wave spring according to Embodiment 1 of the present invention.

Fig. 5 is a front elevational view showing the expansion-fastening connection structure of the first embodiment of the present invention in a state in which the expansion sleeve is fully expanded.

Fig. 6 is a cross-sectional view taken along line B-B of Fig. 5;

Figure 7 is a cross-sectional view showing the center position of one of the expansion members of the expansion joint of the embodiment 2 of the present invention in an unexpanded state of the expansion sleeve.

Figure 8 is a perspective exploded view of the expansion fastening assembly with a circlip and a wave spring according to Embodiment 2 of the present invention.

Figure 9 is a cross-sectional view showing the center position of one of the expansion members of the expansion joint of the embodiment 3 of the present invention in an unexpanded state of the expansion sleeve.

Figure 10 is a cross-sectional view showing the center position of one of the expansion members of the expansion joint of the embodiment 4 of the present invention in an unexpanded state of the expansion sleeve.

Figure 11 is a perspective exploded view of the expansion fastening assembly with a circlip and a wave spring according to Embodiment 4 of the present invention.

Figure 12 is a cross-sectional view showing the center position of one of the expansion members of the expansion joint of the embodiment 5 of the present invention in a state in which the expansion sleeve is fully expanded.

Figure 13 is a perspective view showing the expansion fastening assembly with a wave spring and a rotation nut according to Embodiment 5 of the present invention.

Figure 14 is a cross-sectional view showing the center position of one of the expansion members of the expansion joint of the embodiment 6 of the present invention in a state in which the expansion sleeve is fully expanded.

Figure 15 is a cross-sectional view showing the center position of one of the expansion members of the expansion joint of the embodiment 7 of the present invention in an unexpanded state of the expansion sleeve.

Figure 16 is a perspective exploded view of the expansion fastening assembly of Embodiment 7 of the present invention.

Figure 17 is a perspective exploded view of the expansion fastening assembly of the eighth embodiment of the present invention.

Figure 18 is a cross-sectional view showing the center position of one of the expansion members of the expansion joint of the embodiment 8 of the present invention in an unexpanded state of the expansion sleeve.

Figure 19 is a cross-sectional view showing the center position of one of the expansion members of the expansion joint of the embodiment 9 of the present invention in an unexpanded state of the expansion sleeve.

detailed description

Example 1

As shown in FIG. 1 , FIG. 2 and FIG. 3 , an expansion fastening connection structure includes an expansion fastening assembly, a connected member 1, a connected member 2, a rotation nut 3, a

wave spring

4, and 2 unit lengths. Rigid washer 5, 1 unit length rigid washer 6, 5 unit length rigid washer 7.

As shown in FIG. 2, a circular through hole 8 is provided in the connected member 1, and a circular through hole 9 is provided in the connected member 2.

As shown in FIG. 3 and FIG. 4, the expansion fastening assembly includes a driving core member, and an expansion sleeve 11, a spring 12, and a spring 13 which are assembled by the expansion member 10 having the same three-valve structure to hold the driving core member.

As shown in FIG. 2 and FIG. 4, the expansion member 10 includes an expansion member body 14 whose outer peripheral surface is engaged with the circular through hole 8 on the connector member 1 and has a cylindrical curved surface, and the outer peripheral surface diameter along one end portion of the expansion member body 14. The positioning abutting portion 16 which is convexly disposed toward the outer peripheral surface of the other end portion of the expander body 14 and which is axially positioned to the expansion sleeve 11 and axially resists the connected member 2 is disposed on the protruding resisting projection 15 The spring receiving groove 17 on the outer circumferential surface of the positioning resisting portion 16 is provided on the spring receiving groove 18 that abuts against the outer circumferential surface of the convex portion 15. The outer peripheral surfaces of the abutting convex portion 15, the expander body 14, and the positioning abutting portion 16 are concentric. The outer diameter of the expansion body 14 is equal to the diameter of the circular through hole 8, and the maximum distance from the outer periphery of the positioning abutting portion 16 to the axial center of the expansion body 14 is greater than the maximum distance from the outer periphery of the convex portion 15 to the axial center of the expansion body 14. A drive core housing accommodation space is provided in the expansion sleeve 11.

As shown in FIGS. 2 and 4, the drive core member includes a drive core rod 19, a drive nut 20 that cooperates with the drive core rod 19.

The drive nut 20 includes a driving cone 21, a cylindrical straight rod portion 22 connected to the small end of the driving cone 21, and a cylindrical straight rod portion 23 connected to the large end of the driving cone 21, connected to the straight rod portion 23, and radially A cylindrical resisting portion 24 projecting from the straight rod portion 23, a threaded hole 25 provided at the axial center position, and an adjacent two-lobed expansion member 10 disposed on the outer peripheral surface of the driving cone 21 and the straight rod portion 23 and the expansion sleeve 11 The combination of the gap-fitted anti-rotation ribs 26.

The drive core rod 19 includes a small rod 27 provided with a threaded portion that cooperates with the threaded hole 25 of the drive nut 20, a drive cone 28 connected to the small rod 27, and a cylindrical straight rod portion connected to the large end of the drive cone 28 29. The threaded portion 30 connected to the straight rod portion 29 is provided with an inner hexagonal hole 31 on the end surface of the threaded portion 30. The axial length of the straight rod portion 23 is larger than the axial length of the driving cone 21, and the axial length of the straight rod portion 29 is equal to the axial length of the straight rod portion 23, and the axial length of the driving cone 28 and the driving cone 21 are driven. The axial lengths are equal so that synchronous relative direction drive is achieved.

As shown in FIG. 1 and FIG. 2, in the unexpanded state of the expansion sleeve 11, the driving core housing accommodation space includes a first accommodating space and a second accommodating space. The first accommodating space includes a cylindrical curved surface 32 of a portion of the straight rod portion 23 of the accommodating drive nut 20, a conical surface 33 for a large end that is in contact with the cylindrical curved surface 32, and a converging driving cone 21, and a conical surface 33 for expansion. The cylindrical curved surface 34 of the straight rod portion 22 of the small end end that is in contact with the drive nut 20, the expansion tapered surface 35 of the driving cone 28 that is in contact with the cylindrical curved surface 34 and the driving core rod 19, and the tapered surface for expansion The large end of the 35 is connected to the cylindrical curved surface 36 of the straight rod portion 29 and the partial thread portion 30. The second receiving space is for receiving the resisting portion 24 and the cylindrical curved surface 32. A through-hole recessed portion 37. The diameter of the straight rod portion 23 is equal to the diameter of the cylindrical curved surface 34, and the diameter of the straight rod portion 29 is equal to the diameter of the cylindrical curved surface 34.

All of the cylindrical curved surfaces on the expansion sleeve 11 and the expansion taper and counterbore recesses 37 are broken at the joint positions of the adjacent two expansion members 10. The outer diameter of the wave spring 4 is larger than the outer diameter of the circular through hole 9, so that the wave spring can be restrained between the positioning abutment portion 16 and the connected member 2 when the expansion sleeve 11 is not expanded.

In the unexpanded state of the expansion sleeve 11, the threaded hole 25 of the drive nut 20 is screwed onto the threaded portion of the small rod 27 of the drive core rod 19, and the drive cone 21 of the drive nut 20 is pushed to the drive cone of the drive core rod 19 The axial distance between the small ends of 28 is less than the axial length of the cylindrical curved surface 34. The three-lobed expansion member 10 is hug on the drive nut 20 and the drive core rod 19. The rotation-preventing rib 26 of the drive nut 20 is mounted in the joint gap of the adjacent two-valve expansion member 10, and is held by the expansion cone 31. The positioning expansion member 10 on the driving cone 21 is engaged with the driving nut 20 and the expansion taper 35 on the driving cone 28 to position the expansion member 10 and the driving core rod 19. The three-valve expansion member 10 is not automatically separated from the drive nut 20 and the drive core rod 19 by the spring 12, the spring 13 and the drive core rod 19 to complete the connection of the expansion fastening assembly. The spring 12 is completely accommodated in the spring receiving groove 17, the spring 13 is completely accommodated in the spring receiving groove 18. The rigid washer 7, the rigid washer 6, the rigid washer 5, and the wave spring 4 are passed through the expansion sleeve 11 and one end of the resisting projection 15 is fitted over the expansion body 14 of the expansion sleeve 11. The expansion sleeve 11 is provided with a circular through hole 9 through which the one end of the abutting projection 15 passes through the connected member 2 and the circular through hole 8 on the connected member 1. The expansion member body 14 is mounted on the circular through hole 8 and the detached portion of the connected member 1. In the circular through hole 9 in the connecting member 2, the positioning resisting portion 16 of the expansion sleeve 11 protrudes from the circular through hole 9 in the connecting member 2, and is axially resisted by the connecting member 2 through the wave spring 4, and the expansion sleeve 11 is resisted. The convex portion 15 is axially protruded from the connected member 2.

As shown in FIG. 5 and FIG. 6, in the fully expanded state of the expansion sleeve 11, the resisting convex portion 15 radially protrudes from the circular through hole 8 of the connecting member 1, and the abutting convex portion 15 abuts against the connected member 2 through the surface and the surface. To resist, the connected member 1 is axially resisted by the resisting projection 15; the connected member 2 is axially resisted by the rigid washer 7, the rigid washer 6 is axially resisted by the rigid washer 7, and the rigid washer 6 is axially resisted by the rigid washer 5, The rigid washer 5 is axially resisted by the wave spring 4, the wave spring 4 is axially resisted by the positioning resisting portion 16, and the connecting member 2 is axially resisted by the positioning resisting portion 16; the expansion sleeve 11 is connected to the connected member 1 by the connecting member 2. Fixed together. Since the diameter of the straight rod portion 23 is equal to the diameter of the cylindrical curved surface 34, the diameter of the straight rod portion 29 is equal to the diameter of the cylindrical curved surface 34, and the cylindrical curved surface 34 and the straight rod portion 23 are brought into contact by the surface-to-surface contact, and straight The polished rod portion 29 abuts against the surface by surface contact. The resisting portion 24 is completely housed in the counterbore recess 37. The wave spring 4 is used to eliminate the axial gap of the expansion connection fastening structure. The outer peripheral surface of the corresponding expansion member body 14 on the expansion sleeve 11 is distributed on the same circumferential surface, and is tightly fitted to the surface of the hole of the circular through hole 8 on the connected member 1 by surface-to-surface contact. The outer circumferential surfaces of the abutting projections 15 of the expansion sleeve 11 are distributed on the same circumferential surface, and the outer circumferential surfaces of the positioning abutting portions 16 are distributed on the same circumferential surface, and the outer circumferential surfaces of the convex portion 15, the expansion member body 14, and the positioning abutting portion 16 are resisted. The abutting convex portion 15 is formed in only one ring of the ring in which the adjacent two expansion members 10 are coupled to each other, and the positioning resisting portion 16 is formed in only one ring of the ring in which the adjacent two expansion members 10 are disconnected.

In a state where the drive nut 20 and the drive core rod 19 have been completely mounted in position (i.e., the resisting portion 24 of the drive nut 20 abuts against the bottom surface of the counterbore recess 37), the straight rod portion 23 of the drive nut 20 has passed over the expansion cone The small end of the face 33 has a set distance that cooperates with the cylindrical curved surface 34, and the resisting portion 24 is resisted by the bottom surface of the counterbore recess 37; the straight beam portion 29 of the drive core 19 has passed over the small end of the expansion taper 35 The set distance is matched with the cylindrical curved surface 34. At the connection position of the connected member 1 and the connected member 2, the straight rod portion 29 is tightly fitted to the expansion sleeve 11. The rotation-rotating nut 3 is screwed onto the threaded portion 30, and the rotation-rotating nut 3 prevents the drive core rod 19 from being reversed, and the rotation-rotating nut 3 abuts against the end surface of the expansion sleeve 11 facing away from the connected member 1, ensuring that the drive core rod 19 is held in the expansion sleeve 11 The position of full expansion does not change. The rotation nut 3 and the threaded portion 30 cooperate to form a limit mechanism.

As shown in FIG. 2 and FIG. 6, a connection method of an expansion fastening structure, the connection method comprises the following steps:

The threaded hole 25 of the drive nut 20 is screwed onto the small rod 27 of the drive core rod 19, and the axial distance between the small end of the drive cone 21 of the drive nut 20 to the small end of the drive cone 28 of the drive core rod 19 is less than The axial length of the cylindrical curved surface 34;

The three-lobed expansion member 10 is hug on the driving nut 20 and the driving core rod 19. The rotation preventing rib 26 of the driving nut 20 extends into the coupling slit of the adjacent two-valve expansion member 10, and abuts against the expansion tapered surface 33. Positioning the expansion member 10 on the drive cone 21 and the drive nut 20, the expansion cone 35 against the drive cone 28 to position the expansion member 10 and the drive core rod 19;

The spring 12 is mounted in the spring receiving groove 17, and the spring 13 is mounted in the spring receiving groove 18, and the three-valve expansion member 10 is not automatically separated from the driving nut 20 and the driving core rod 19 to complete the expansion fastening assembly. Connection;

The rigid washer 7, the rigid washer 6, the rigid washer 5, the wave spring 4 is passed through the expansion sleeve 11 and one end of the resisting convex portion 15 is sleeved on the expander body 14;

The expansion sleeve 11 is provided with one end of the resisting convex portion 15 through the circular through hole 9 on the connected member 2 and the circular through hole 8 on the connected member 1;

The force applied to the expansion sleeve 11 in the axial direction of the connected member 2 is abutted against the connected member 1 by the connecting member 2, the positioning resisting portion 16 abuts against the rigid washer 7, and the rigid washer 7 abuts against the rigid washer 6 The rigid washer 6 abuts against the rigid washer 5, the rigid washer 5 abuts against the wave spring 4, and the wave spring 4 abuts against the connected member 2, and the expansion sleeve 11 is axially resisted by the connecting member 2 by the positioning resisting portion 16, and is inflated. The resisting protrusion 15 on the sleeve 11 axially protrudes from the connected member 1;

Rotating the driving mandrel 19, the driving nut 20 is synchronously moved by the screwing engagement with the driving core rod 19, and the driving cone 21 of the driving nut 20 slides on the expansion taper 33, and the driving cone 28 of the driving core rod 19 is expanded. The expansion sleeve 11 is slidably driven by the sliding surface 35, and the expansion member 10 is radially moved. The abutting convex portion 15 radially protrudes from the circular through hole 8 of the connecting member 1, and the convex portion 15 passes through the surface of the connected member 1 and The surface is resisted against the axial direction; the connected member 2 is axially resisted by the positioning resisting portion 16, and the connected member 1 is axially resisted by the resisting convex portion 15;

After the expansion sleeve 11 is fully expanded, the expansion sleeve 11 is no longer moved in the radial direction and remains in the fully expanded state. The drive core rod 19 is continuously rotated, and the drive nut 20 and the drive core rod 19 continue to move relative to the axial direction of the expansion sleeve 11, and the nut is driven. The straight rod portion 23 of 20 passes over the small end of the expansion taper 33 until the resist portion 24 is resisted by the bottom surface of the counterbore recess 37, and the straight rod portion 29 of the drive core rod 19 passes over the small end of the expansion taper 35 to drive The nut 20 and the driving core rod 19 have been completely installed in position, the rotation of the driving core rod 19 is stopped, and the driving core member stops driving;

The expansion sleeve 11 will be connected and fixed by the connecting member 2 and the connected member 1;

The rotation nut 3 is screwed onto the threaded portion 30, and the rotation nut 3 abuts against the end face of the connected member 1 against the expansion sleeve 11.

To disassemble, the rotation nut 3 and the threaded portion 30 are first reversed and detached, and then the core rod 19 is driven in the reverse direction.

Example 2

As shown in FIG. 7 and FIG. 8, different from the first embodiment, the driving core member is a driving core rod 61. The driving core rod 61 includes a small rod 62 of a polished rod, a driving cone 63 connected to the small rod 62, and a driving. The straight rod portion 64, to which the large end of the cone 63 is connected, is connected to the straight rod portion 64 and radially protrudes from the resisting portion 65 of the straight rod portion 64. In the unexpanded state of the expansion sleeve 82, the driving core housing accommodating space includes a cylindrical curved surface 67 which is closed by the small holding rod 62, a small end which is in contact with the cylindrical curved surface 67, and a conical surface 68 for expansion of the driving cone 63, and expansion. The first accommodating space formed by the cylindrical curved surface 69 of the straight light rod portion 64 and the second accommodating space 70 for accommodating the resisting portion 65 is fully expanded in the expansion sleeve 82. In a state (not shown), the resisting portion 65 is completely accommodated in the second accommodating space 70.

The expansion fastening assembly further includes a limit mechanism that limits the surface of the drive core rod 61 against the surface of the connector 78 and maintains the drive core 61 in a fully expanded position of the expansion sleeve 82. The limiting mechanism includes a snap spring 72 and a card slot 73. The retaining spring 72 is a broken ring. The card slot 73 is disposed on the wall of the second accommodating space 70 and cooperates with the circlip 72.

In a state in which the expansion sleeve 82 is not inflated, a portion of the straight rod portion 64 that drives the core rod 61 and the abutting portion 65 protrude from the positioning resist portion 83 of the expansion sleeve 82. The diameter of the straight rod portion 64 is equal to the diameter of the cylindrical curved surface 67. In the fully expanded state of the expansion sleeve 82, the straight rod portion 64 and the wall of the cylindrical curved surface 67 are fitted together by the surface to face. When the snap spring 72 is mounted in the card slot 73, the retaining spring 72 limits the resisting portion 65.

Connection methods include:

The three-lobed expansion member 84 is hug on the driving core rod 61, and is hung on the driving cone 63 by the expansion taper 68 to position the expansion member 84 and the driving core rod 61;

The three-valve expansion member 84 and the driving core rod 61 are not automatically separated by the spring 74 and the spring 71;

The wave spring 85 is sleeved on the expansion body 75 of the expansion sleeve 82;

The expansion sleeve 82 is provided with one end of the abutting convex portion 80 through the circular through hole 77 on the connecting member 76 and the circular through hole 79 on the connected member 78;

A force is applied to the expansion sleeve 82 in the axial direction of the connected member 76, the connecting member 76 abuts against the connected member 78, the wave spring 85 abuts against the connected member 76, and the positioning resist portion 83 abuts against the wave spring 85. , the expansion sleeve 82 is axially resisted by the connecting member 76 by the positioning member 83, the resisting projection 80 on the expansion sleeve 82 axially protrudes from the connected member 78;

Hammering or pressing the driving core rod 61, the driving core rod 61 is axially moved relative to the expansion sleeve 82, and the driving sleeve 63 is slidably driven on the expansion taper surface 68 to drive the expansion sleeve 82 to expand, and each of the valve expansion members 84 moves radially to resist The convex portion 80 is axially resisted by the connecting member 78 through the surface and the surface abutting direction, the connecting member 76 is axially resisted by the wave spring 85, and the wave spring 85 is axially resisted by the positioning resisting portion 83;

After the expansion sleeve 82 is fully expanded, the expansion sleeve 82 is no longer moved in the radial direction and remains in the fully expanded state, the drive core rod 61 continues to move relative to the axial direction of the expansion sleeve 82, and the straight rod portion 64 passes over the small rod of the expansion cone 68. 62 until the resisting portion 65 is resisted by the bottom surface of the second accommodating space 70, and the driving core rod 61 stops driving;

The connecting member 76 is axially resisted by the positioning resisting portion 83, and the connecting member 78 is axially resisted by the resisting convex portion 80, and the expansion sleeve 82 is connected and fixed by the connecting member 76 and the connected member 78;

The clip spring 72 is mounted in the card slot 73.

To disassemble, the circlip 72 is first detached from the slot 73, and then an axial force is applied from the side of the resisting projection 80 toward the driving core 61 toward the positioning resisting portion 83 so that the expanding core rod faces the positioning. The portion 83 is axially moved, and the expansion sleeve 82 is detachable from the connected member 78 and the connected member 76.

Example 3

As shown in FIG. 9, unlike the first embodiment, the driving core member includes a driving core rod 141 and a driving nut 142 that cooperates with the driving core rod 141. The driving core rod 141 includes a small rod 143 provided with a thread, a first driving cone 145 connected to the small rod 143 for driving the expansion of the expansion sleeve 144, and a cylindrical first straight connected to the large end of the first driving cone 145. The light rod portion 146 has a connecting cone 147 with a large end connected to the first straight rod portion 146, a cylindrical second straight rod portion 148 connected to the small end of the connecting cone 147, and a small end connected to the second straight rod portion 148. a second driving cone 149 for driving the expansion sleeve 144 to expand, a cylindrical third straight rod portion 150 connected to the large end of the second driving cone 149, disposed at an axial position of the end surface of the third straight rod portion 150, and being expanded in installation a hexagonal blind hole 151 fitted with the wrench when fastening the connecting assembly and disassembling the expansion fastening connection assembly, and six even distributions disposed on the end surface of the third straight beam portion 150 and penetrating the circumference of the third straight rod portion 150 Stop groove 152. The drive nut 142 includes a cylindrical drive nut body 153, and a rotation preventing protrusion 154 disposed at an end surface of the drive nut body 153 and engaging with a coupling slit of the adjacent two-valve expansion member 164 of the expansion sleeve 144 is disposed at the drive nut 142. A threaded hole 155 of the shaft center. The axial length of the first optical rod portion 146 is greater than the axial length setting distance of the first driving cone 145, and the axial length of the third straight optical rod portion 150 is greater than the axial length of the first straight optical rod portion 146, and the second driving The axial length of the cone 149 is equal to the axial length of the first drive cone 145.

The driving core housing accommodating space in the unexpanded expansion sleeve 144 includes a cylindrical curved surface 156 of the partial small rod 143 of the accommodating driving core rod 141, a first expansion tapered surface 157 of the first driving cone 145, and a first holding angle a cylindrical curved surface 158 of the straight rod portion 146, a connecting tapered surface 159 of the joint connecting cone 147, a cylindrical curved surface 160 that accompanies the second straight rod portion 148, and a second expanding tapered surface 161 that embraces the second driving cone 149, A cylindrical curved surface 162 of the third straight light rod portion 150 is engaged with a driving nut receiving groove 163 which is disposed on the wall of the cylindrical curved surface 156 and cooperates with the driving nut 142.

The small rod 143 of the driving core rod 141 extends into the threaded hole 155 of the driving nut 142 and is threadedly engaged with the driving nut 142. The axial distance of the end surface of the driving nut 142 to the small rod 143 of the first driving cone 145 is greater than the driving nut receiving groove. 163 to the axial distance of the first expansion taper 157 small rod 143. The expansion member 164 is hugged outside the driving core rod 141 and the driving nut 142. The driving nut 142 is mounted in the driving nut receiving groove 163. The rotation preventing convex portion 154 of the driving nut 142 extends into the joint seam of the adjacent two-valve expansion member 164. .

The connection method is different from that of Embodiment 1:

The threaded hole 155 of the driving nut 142 is screwed onto the small rod 143 of the driving core rod 141, and the axial distance of the end surface of the driving nut 142 to the small rod 143 of the first driving cone 145 is greater than the driving nut receiving groove 163 to the first The axial distance of the expansion cone 157 small rod 143;

The three-lobed expansion member 164 is hug on the driving nut 142 and the driving core rod 141, and is mounted in the nut receiving groove 163 by the driving nut 142. The rotation preventing convex portion 154 of the driving nut 142 extends into the adjacent two-valve expansion member 164. The expansion member 164 is completely positioned in the joint gap with the driving nut 142 and the driving core rod 141;

Until the end face of the third straight rod portion 150 of the driving core rod 141 passes over the card slot 165 of the expansion sleeve 144, the driving nut 142 and the driving core rod 141 are completely mounted in position, the rotation of the driving core rod 141 is stopped, and the driving core member stops driving.

Example 4

As shown in FIG. 10 and FIG. 11, different from the first embodiment, the driving core rod includes a driving core body 191, and the resisting portion 192 protruding from the outer periphery of the driving core rod body 191 and the two structures have the same expansion and contraction. With the protruding portion 193, the threaded portion 195 of the driving nut 194 is disposed at one end of the driving core rod body 191 away from the resisting portion 192, is disposed on the end surface of the resisting portion 192, and is mounted with the expansion fastening assembly and the disassembly expansion fastening connection. The assembly has a hexagonal blind hole 196 that fits the wrench and six evenly distributed anti-rotation grooves 197 that are disposed on the end surface of the abutting portion 192 and extend through the circumferential surface of the abutting portion 192.

The expansion and contraction projection 193 is used to expand and contract the expansion sleeve 198. The expansion and contraction projection 193 includes a driving cone 199 disposed on a side facing away from the abutting portion 192 for driving the expansion sleeve 198 to expand, and is disposed at the facing end portion. One side of the 192, a constricting recessed portion 200 for contracting the expansion sleeve 198, a cylindrical light rod portion 201 connecting the driving cone 199 and the constricting recessed portion 200, the driving cone 199 and the conical taper The taper directions of the recessed portions 200 are uniform.

The driving core housing accommodating space includes a first accommodating space formed by the cylindrical curved surface 202 of the accommodating driving core body 191, and a second accommodating space 203 for accommodating the resisting portion 192. In the fully expanded state of the expansion sleeve 198 (not shown), the second accommodation space 203 cooperates with the abutting portion 192 and completely accommodates the abutting portion 192. A nut accommodating groove 204 that is engaged with the driving nut 194 and two expansion and contraction accommodating grooves 205 that are respectively engaged with the two expansion and contraction projections 193 are provided on the wall of the cylindrical curved surface 202. The expansion and contraction accommodating groove 205 faces away from the groove wall of the connected member 207 to form an expansion taper 206 for driving the expansion sleeve 198 to expand and cooperate with the drive cone 199 of the drive core rod, and the expansion and contraction accommodating groove 205 is oriented toward The groove wall of the connecting member 207 is formed with a shrinking tapered surface 208 for contracting the expansion sleeve 198, and a contracting conical recessed portion 200 for driving the core rod, and a conical taper surface 206 and a constricting tapered surface 208, and a polished rod. The cylindrical surface 209 of the portion 201 is matched.

Example 5

As shown in FIGS. 12 and 13, the expansion fastening structure is different from that of the first embodiment in that the expansion sleeve 350 is formed by the two-valve expansion member 351. Only the wave spring 352 is attached between the positioning abutting portion 353 of the expansion sleeve 350 and the member to be connected 354.

The expansion fastening assembly also includes a cap 357. The cap 357 includes a lumen 358, and a buckle 359 is protruded from a bottom surface of the inner cavity 358. An abutment groove 360 that cooperates with the buckle 359 is disposed on an outer circumference of the resisting portion 356 of the driving nut 355.

In the fully expanded state of the expansion sleeve 350, the resisting portion 356 of the driving nut 355 is abutted against the end surface of the expansion sleeve 350 away from the positioning resisting portion 353, and the cap 357 is fastened to the resisting groove 360 by the buckle 359 to be mounted with the driving nut 355. A portion of the small rod 365 of the drive core 362 that protrudes from the connector 361 and the abutment portion 356 of the drive nut 355 are completely received within the inner cavity 358 of the cap 357.

The connection method is different from that of Embodiment 1 in that after the expansion sleeve 350 is fully expanded, when the resisting portion 356 of the driving nut 355 is resisted by the end surface of the expansion sleeve 350, the driving nut 355 and the driving core rod 362 are completely mounted in position, and the driving core rod is driven. The rotation stop 363 is screwed onto the rotation preventing screw portion 364, and the rotation preventing nut 363 abuts against the positioning abutting portion 353 of the expansion sleeve 350. The buckle 359 of the cap 357 is snapped into the abutment groove 360 of the drive nut 355.

To disassemble, the rotation nut 363 is first separated from the rotation preventing screw portion 364 of the driving core rod 362, the cap 357 is separated from the driving nut 355, and the core rod 362 is driven in the reverse direction.

Example 6

As shown in FIG. 14, the expansion fastening structure differs from Embodiment 1 in that the expansion fastening connection assembly includes a cap 380 and a cap 381. The cap 380 includes an inner cavity 382. The bottom surface of the inner cavity 382 is provided with a stud 383. The stud 383 is provided with a threaded hole 384. The driving core 385 is provided with a threaded portion 386 protruding from the expansion sleeve 390. The cap 381 includes a cavity 387. The bottom surface of the inner cavity 387 is provided with a stud 388. The stud 388 is provided with a threaded hole 389. The driving core 385 is provided with a threaded portion 391 protruding from the expansion sleeve 390. Portion 391 is also used to connect the stop nut 392. In the fully expanded state of the expansion sleeve 390, the threaded hole 384 of the cap 380 is threadedly coupled to the threaded portion 386 of the drive spindle 385, and the resisting portion 395 of the drive nut 394 of the connector 393 is projected, and the portion of the threaded portion 386 is received in the cap. The inner cavity 382 of the 380 is inside. In the fully expanded state of the expansion sleeve 390, the threaded hole 389 of the cap 381 is screwed onto the threaded portion 391 of the driving core rod 385, and the wave spring 397 of the connected member 396, the positioning resisting portion 398 of the expansion sleeve 390, and the partial thread portion are protruded. 391. The anti-rotation nut 392 is received in the inner cavity 387 of the cap 381.

The connection method is different from that of the embodiment 11 in that the cap 380 is screwed onto the threaded portion 386; the rotation nut 392 is screwed onto the threaded portion 391, and the cap 381 is screwed onto the threaded portion 391.

To be disassembled, the cap 380 is separated from the threaded portion 386 of the drive mandrel 385; the cap 381 is separated from the threaded portion 391 of the drive mandrel 385, and the stop nut 392 is separated from the threaded portion 391 of the drive mandrel 385; The core rod 385 can be driven in the reverse direction.

Example 7

As shown in FIG. 15 and FIG. 16, the driving core rod 422 includes a driving cone 431, and a cylindrical straight rod portion 432 connected to the large end of the driving cone 431, which is connected to the straight rod portion 432 and radially protrudes from the straight rod portion 432. a cylindrical resisting portion 433, a cylindrical straight rod portion connected to the small end of the driving cone 431, a threaded portion connected to the straight rod portion, and three convex portions protruding on the outer circumference of the driving cone 431 and the cylindrical straight rod portion The outer peripheral surface of the rib is coplanar with the outer peripheral surface of the cylindrical straight rod portion 432. A recessed portion that cooperates with a ridge is provided on the expansion member.

The limiting mechanism is a circlip and a card slot. The circlip includes a heart-ring that is disconnected in the middle, and a one that is away from the disconnected position from the heart-shaped ring A block-shaped rotation stop that protrudes from the side. a groove corresponding to the heart-shaped ring is disposed on the inner circumferential surface of the expansion sleeve, and a rotation stop groove that cooperates with the rotation preventing convex portion of the circlip is provided on the end surface of the driving nut

A first rib 437 that mates with a corresponding recess 430 on the drive nut 421 and a second rib 438 that mates with a corresponding recess 435 on the drive core 422 are provided on the expansion member 436. The first ribs 437 and the second ribs 438 are coplanar on both sides, and are connected as a whole.

In the unexpanded state of the expansion sleeve 439, the driving core housing accommodation space includes a first accommodating space and a second accommodating space. The first accommodating space includes a cylindrical curved surface 440 of a portion of the straight rod portion 427 of the entangled drive nut 421, a tapered surface 441 that is joined to the cylindrical curved surface 440 at the large end, and that converges the driving cone 425, and a tapered surface 441 for expansion. The cylindrical curved surface 442 of the straight rod portion 426 of the small end end and the holding nut 421 is joined, and the small end is in contact with the cylindrical curved surface 442 and the expansion tapered surface 443 of the driving cone 431 of the driving core rod 422 is engaged with the expansion surface. The tapered surface 443 is joined at the large end, and the cylindrical curved surface 444 of the straight rod portion 432 of the driving member 422 is clamped. The second accommodating space includes a counterbore-shaped recess 445 communicating with the cylindrical curved surface 440 for accommodating the resisting portion 428 of the driving nut 421, and a resisting portion communicating with the cylindrical curved surface 444 for accommodating the driving core rod 422 A counterbore recess 446 of 433. In the fully expanded state of the expansion sleeve 439, the resisting portion 428 is completely received in the counterbore-shaped recessed portion 445, and the resisting portion 433 is completely received in the counterbore-shaped recessed portion 446.

The core body 423 of the core rod 420 is threadedly coupled to the threaded hole 429 of the drive nut 421 through the through hole 434 of the drive core rod 422. In a state where the abutting portion 433 of the driving core rod 422 abuts against the core rod resisting portion 424, the axial distance between the small end of the driving cone 425 of the driving nut 421 to the small end of the driving cone 431 of the driving core rod 422 is slightly smaller than that of the cylinder. The axial length of the curved surface 442. The three-lobed expansion member 436 is hugged on the drive nut 421 and the drive core rod 422. The first rib 437 of the expansion member 436 is mounted in a corresponding recess 430 of the drive nut 421, and the expansion member 436 and the drive nut 421 are positioned against the drive cone 425 by the expansion tapered surface 441. The second ribs 438 of the expansion member 436 are mounted in corresponding recesses 435 of the drive mandrel 422, and the expansion member 436 and the drive mandrel 422 are positioned against the drive cone 431 by the expansion taper 443. The three-valve expansion member 436 is not automatically separated from the drive nut 421, the drive core rod 422, and the core rod 420 by the spring 447 and the spring 448.

When the expansion sleeve 439 is fully expanded, and the driving nut 421, the driving core rod 422, and the core rod 420 are completely mounted in position, the resisting portion 428 of the driving nut 421 is resisted by the bottom surface of the counterbore recess 445, and the driving core rod is driven. The abutting portion 433 of the 422 is resisted by the bottom surface of the counterbore recess 446.

A connection method for an expansion fastening structure, the connection method comprising the following steps:

The core body 423 of the core rod 420 is threadedly connected to the threaded hole 429 of the driving nut 421 through the through hole 434 of the driving core rod 422, and is driven in a state in which the resisting portion 433 of the driving core rod 422 abuts against the core rod resisting portion 424. The axial distance between the small end of the driving cone 425 of the nut 421 to the driving cone 431 of the driving core rod 422 is slightly smaller than the axial length of the cylindrical curved surface 442;

The three-lobed expansion member 436 is hug on the drive nut 421 and the drive core rod 422. The first rib 437 of the expansion member 436 extends into the corresponding recessed portion 430 of the drive nut 421, and the second rib 438 of the expansion member 436 extends. Inserting into the corresponding recessed portion 435 of the driving core rod 422, and positioning the expansion member 436 and the driving nut 421 and the expanding tapered surface 443 against the driving cone 431 by the expansion tapered surface 441 against the driving cone 425 Positioning the expansion member 436 and the driving core rod 422;

The three-valve expansion member 436 and the driving nut 421, the driving core rod 422, and the core rod 420 are not automatically separated by the spring 447 and the spring 448 to complete the connection of the expansion fastening assembly;

The above steps are generally completed at the factory;

The wave spring 449 is sleeved on the expansion body 450 of the expansion sleeve 439;

The expansion sleeve 439 is provided with one end of the abutting convex portion 456 through the circular through hole 452 of the connected member 451 and the circular through hole 454 of the connected member 453;

A force toward the axial direction of the connected member 451 is applied to the positioning resisting portion 455 of the expansion sleeve 439, and the connecting member 451 abuts against the connected member 453, the positioning resisting portion 455 abuts against the wave spring 449, and the wave spring 449 is The connecting member 451 abuts, the expansion sleeve 439 is axially resisted by the connecting member 451 by the positioning member 451, the resisting convex portion 456 on the expansion sleeve 439 axially protrudes the connected member 453;

The rotating core rod 420, the driving nut 421, and the driving core rod 422 are synchronously moved in synchronization, and the driving cone 425 of the driving nut 421 slides on the expansion tapered surface 441, and the driving cone 431 of the driving core rod 422 is in the expansion tapered surface 443. The upper sliding drive expansion sleeve 439 is expanded, and each of the expansion members 436 is moved radially, and the abutting convex portion 456 radially protrudes from the circular through hole 454 of the connecting member 453, and the abutting convex portion 456 abuts the connected member 453 through the surface and the surface abutting shaft To resist, the connected member 451 is axially resisted by the wave spring 449, and the wave spring 449 is positioned to resist axially against the blocking portion 455;

After the expansion sleeve 439 is fully expanded, the expansion sleeve 439 is no longer moved in the radial direction and remains in the fully expanded state. The core rod 420 is continuously rotated, and the driving nut 421 and the core rod 420 continue to move relative to the axial direction of the expansion sleeve 439, and the nut 421 is driven. The straight rod portion 427 passes over the small end of the expansion tapered surface 441 until the resist portion 428 is resisted by the bottom surface of the counterbore recess portion 445, and the small end portion of the straight rod portion 432 of the driving core rod 422 over the expansion tapered surface 443 is reached until the resist portion 433 is resisted by the bottom surface of the counterbore recess 446, and the driving nut 421, the driving core rod 422, and the core rod 420 are completely mounted in position, the rotating core rod 420 is stopped, and the driving core member stops driving.

To disassemble the expansion fastening assembly, rotate the core rod 420 in the opposite direction.

Example 8

As shown in FIGS. 17 and 18, unlike the first embodiment, the driving core 480 includes a driving cone 481, a cylindrical polished rod portion 482 connected to the large end of the driving cone 481, and the driving cone. A cylindrical optical rod portion 483 connected to the small end of the body 481, a screw portion 484 connected to the optical rod 483, and three ribs 485 protruding on the outer peripheral surface of the driving cone 481 and the optical rod 483, and a cylinder protruding radially from the optical rod portion 482 Shape resisting portion 486.

Example 9

As shown in FIG. 19, unlike the first embodiment, the driving core rod includes a small end 521 provided with a threaded hole 520 of the driving nut, a driving cone 522 connected to the small end 521, and a driving cone 522. The cylindrical straight rod portion 523, which is connected at the large end, radially protrudes from the cap 524 of the straight rod portion 523, and the receiving chamber 525 is formed on the side of the cap 524 facing the expansion sleeve 526.

In the fully expanded state of the expansion sleeve 526, the cap 524 abuts against the connected member 527, and the wave spring 528 protruding from the connector 527 and the positioning abutment portion 529 of the expansion sleeve 526 are received in the receiving cavity 525 of the cap 524.

Claims

An expansion fastening connection structure comprising an expansion fastening connection assembly and two or more connected parts;

Through holes are provided on the connected parts;

The expansion fastening connection assembly comprises a drive core member, two or more expansion members; the expansion member constitutes an expansion sleeve for holding the drive core member;

Providing an expansion cone for driving the expansion sleeve to expand on each of the expansion members;

a driving core member accommodating space is disposed in the expansion sleeve, and the expansion cone surface is disposed on a wall of the driving core member accommodating space;

Providing a driving cone surface on the driving core member that cooperates with the expansion taper on each of the expansion sleeves;

The expansion member comprises an expansion member body, a positioning abutting portion radially protruding from one end of the expansion member body, a protruding convex portion protruding radially at the other end of the expansion member body; positioning the resisting portion to expand The distance from the axis of the piece is greater than the distance from the abutting protrusion to the axis of the body of the expansion member;

The positioning resisting portion on the expansion sleeve forms only one ring of independent ring that is broken at the joint position of the expansion member, and the abutting protrusion portion on the expansion sleeve forms only a ring of independent ring that is broken at the joint position of the expansion member;

The driving core member is installed in the driving core member accommodating space, and the expansion sleeve is provided with one end of the protruding convex portion passing through the through hole of all the connected members, and the positioning resisting portion of the expansion sleeve radially protrudes the through hole of the connected member, and The abutting convex portion of the expansion sleeve protrudes axially from the connecting member, and the expansion member body is installed in the through hole of the connected member; in the fully expanded state of the expansion sleeve, the convex portion is radially protruded and connected The through hole of the piece resists the axial direction of the connected piece through the surface abutting surface, and the side of the connecting piece facing the positioning abutting portion is axially resisted by the positioning resisting portion, and the side of the connecting piece facing the resisting convex portion The expansion sleeves are axially resisted by the abutting projections, and the expansion sleeves are connected and fixed together by two or more connected members.
The expansion fastening joint structure according to claim 1, wherein the outer peripheral surface of the expansion member body is a cylindrical curved surface, and the positioning abutting portion is radially along the outer peripheral surface of the one end end of the expansion member body. Forming a convex portion, wherein the resisting convex portion is formed to protrude radially along an outer peripheral surface of the other end portion of the expander body; an outer diameter of the outer peripheral surface of the expander body is equal to or smaller than an aperture of the through hole of the connected member; The expansion sleeve is fully expanded, and the outer circumferential surface of the corresponding expansion member body on the expansion sleeve is distributed on the same circumferential surface, and the hole wall of the circular hole on the parent member is tightly matched by the surface-to-surface contact or the round hole on the parent member. The hole walls are uniformly gap-fitted, and the outer peripheral surface of the resisting convex portion is distributed on the same circumferential surface, and the outer peripheral surface of the positioning resisting portion is distributed on the same circumferential surface, and the outer peripheral surface of the convex portion, the expansion member body and the positioning resisting portion are concentric. The resisting convex portion is formed by only one ring of the ring which is disconnected at the joint position of the adjacent two expansion members, and the positioning abutting portion is formed by only one ring of the ring which is disconnected at the joint position of the adjacent two expansion members.
The expansion fastening joint structure according to claim 1, wherein in the state in which the expansion sleeve is fully expanded, the outer circumferential surface of the corresponding expansion member body on the expansion sleeve is distributed on the same circumferential surface, and the female member member The hole wall of the circular hole is tightly fitted by the surface-to-surface contact or uniformly with the hole wall of the circular hole on the parent member.
The expansion fastening structure according to claim 1, further comprising a wave spring or an elastic washer sleeved on the expansion body of the expansion sleeve to eliminate the axial gap, and the wave spring or the elastic washer is mounted on the positioning resisting portion. Between and with the connected member, and/or between the convex portion and the connected member.
The expansion fastening structure of claim 1 further comprising a rigid gasket overlying the expansion member body of the expansion sleeve, the rigid gasket being mounted between the positioning abutment and the connected member, and/or resisting Between the convex portion and the connected member, the thickness of the rigid gasket is matched with the axial distance between the positioning abutting portion of the expansion sleeve and the opposite surface of the resisting convex portion, and then the sum of the thicknesses of the two or more connected members to be connected is matched. .
The expansion fastening joint structure according to claim 5, wherein said rigid gasket thickness specification comprises one unit length, two unit lengths, and five unit lengths.
The expansion fastening structure according to claim 1, wherein a guide portion is provided on a side of the abutting projection toward the member to be connected.
The expansion fastening structure according to claim 1, wherein said driving core member comprises a driving core rod, said driving cone surface being provided on said driving core rod; said driving core rod further The utility model comprises a straight light rod portion connected to the big end of the driving cone surface, the axial length of the straight light rod portion is larger than the axial length of the driving cone surface; in the fully expanded state of the expansion sleeve, the driving cone on the driving core rod There is a set distance between the face and the corresponding expansion taper on the expansion sleeve in the axial direction.
The expansion fastening structure according to claim 8, wherein in the fully expanded state of the expansion sleeve, the straight light rod portion is tightly fitted to the expansion sleeve at the connection position of the two adjacent connected members.
The expansion fastening structure according to claim 1, wherein the driving core member comprises a driving core rod; the expansion fastening connection structure further comprises a limiting mechanism, wherein the limiting mechanism is a circlip and a card slot. The card slot is set in the expansion sleeve and The circlip fit; in the fully expanded state of the expansion sleeve, the circlip is installed in the card slot, and the circlip locks the surface of the drive core rod away from the connected member, so that the drive core rod remains at the position where the expansion sleeve is fully expanded.
An expansion fastening joint structure according to claim 1, wherein said drive core member comprises a drive core rod and a drive nut threadedly coupled to the drive core rod; said expansion fastening connection structure further comprising a limit The mechanism, the limiting mechanism rotates the threaded portion and the rotation nut structure, and the rotation preventing screw portion is disposed at an end portion of the driving core rod protruding from the expansion sleeve; in the fully expanded state of the expansion sleeve, the rotation preventing nut is screwed to the rotation preventing thread portion Upper, the anti-rotation nut resists the end surface of the expansion sleeve, so that the driving core rod remains in the position where the expansion sleeve is fully expanded.
The expansion fastening joint structure according to claim 1, wherein a corresponding position of the driving core member accommodating space is formed on each of the valve expansion members, and a protruding strip or a recessed portion is provided in the expansion member. The convex strip or the concave portion is provided with the expansion taper surface; the driving core member is provided with a concave portion that cooperates with the convex strip on each of the expansion members, or cooperates with the concave portion on each of the expansion members. The rib is provided with the driving taper on the ridge or recess of the driving core.
The expansion fastening structure according to claim 1, wherein said driving core member comprises a driving core rod or a core rod, and said driving core rod or core rod is provided with a fully expanded state of the expansion sleeve. The expansion sleeve axially resists the limiting protrusion of the axial direction against the expansion sleeve.
The expansion fastening joint structure according to claim 1, wherein said expansion fastening joint assembly further comprises a cap; said cap comprises an inner cavity, and a buckle is protruded from a bottom surface of the inner cavity; Or the driving core member is provided with a resisting groove; in the fully expanded state of the expansion sleeve, the cap is fastened to the abutting groove by the snap-fit and is mounted with the expansion sleeve or the driving core member, and protrudes from the expansion sleeve of the connected member or protrudes The expansion sleeve and the drive core of the connected member are housed in the inner cavity of the cap.
The expansion fastening joint structure according to claim 1, wherein said expansion fastening joint assembly further comprises a cap; said cap comprises an inner cavity, and a convex column is provided on a bottom surface of said inner cavity, on said stud a threaded hole is provided; a threaded portion of the protruding expansion sleeve is arranged on the driving core rod; the threaded hole of the cap is screwed on the driving core rod, and the expansion sleeve of the connected piece protrudes or the expansion sleeve of the connected piece protrudes And driving the core member is received in the inner cavity of the cap.
A connection method for an expansion fastening structure, characterized in that the connection method comprises:

Providing an expansion fastening connection assembly comprising a drive core member, two or more expansion members; the expansion member constituting an expansion sleeve for holding the drive core member;

Providing two or more connected members that need to be coupled, and having through holes on the connected members;

The expansion member includes an expansion member body, a positioning abutting portion radially protruding from one end of the expansion member body, and a resisting convex portion radially protruding at the other end of the expansion member body;

The driving core member is installed in the driving core member accommodating space, and the expansion sleeve is provided with one end of the protruding convex portion through the through hole of all the connected members, and the positioning resisting portion of the expansion sleeve radially protrudes the through hole of the connected member And being connected to resist positioning, the resisting protrusion of the expansion sleeve protrudes axially from the connecting member and is axially resisted by the connecting member, and the expanding member body is installed in the through hole of the connected member; the driving core member drives the expansion sleeve to expand, The radial movement of each of the expansion members resists the convex portion radially protruding from the through hole of the connecting member, and the abutting convex portion abuts against the axial direction of the connected member through the surface and the surface, and the side of the connecting member facing the positioning resisting portion is The positioning resisting portion axially resists, and the side of the connecting member facing the resisting convex portion is axially resisted by the resisting convex portion;

The expansion sleeve secures the two or more connected members together.
The method for connecting an expansion fastening structure according to claim 16, wherein after the expansion sleeve is fully expanded, the expansion sleeve no longer moves in a radial direction and remains in a fully expanded state, and the driving core rod continues to be opposite to the expansion sleeve axis. Move in the direction to the set position.
The method for connecting an expansion fastening structure according to claim 16, wherein a expansion cone for driving the expansion sleeve is provided on each of the expansion members;

a driving core member accommodating space is disposed in the expansion sleeve, and the expansion cone surface is disposed on a wall of the driving core member accommodating space;

Providing a driving cone surface on the driving core member that cooperates with the expansion taper on each of the expansion sleeves;

During the expansion of the drive core drive expansion sleeve, the drive cone slides along the expansion cone to drive the radial movement of each of the expansion members.
A method of connecting an expansion fastening structure according to claim 16, wherein said driving core member comprises a driving core rod, said driving cone surface being provided on said driving core rod; The driving core rod further includes a straight light rod portion connected to the large end of the driving cone surface, the axial length of the straight light rod portion is larger than the axial length of the driving cone surface; the driving core member drives the expansion sleeve to achieve full expansion Thereafter, the driving core member continues to move, and the end portion of the driving straight rod portion of the driving rod and the large end of the driving tapered surface continues to move to the set position beyond the small end of the expanding tapered surface.
The method for connecting an expansion fastening structure according to claim 16, wherein the expansion fastening structure further comprises a limiting mechanism; the driving core member drives the expansion sleeve to expand, and the expansion sleeve no longer generates radial movement Expansion sleeve completely Expansion; in the fully expanded state of the expansion sleeve, the driving core member stops moving or continues to move to the set position, and then the upper limit mechanism is installed; the limiting mechanism limits the driving core rod away from the surface of the connected member, so that the driving core rod is maintained The position of the expansion sleeve is completely expanded.
A method of connecting an expansion fastening structure according to claim 16, wherein said driving core member comprises a driving core rod, a driving nut matched with the driving core rod; and the driving core rod comprises a small threaded portion. a rod, a first driving cone formed by the driving cone surface connected to the small end, and a first straight light rod portion connected to the large end of the first driving cone; the driving core housing accommodating space further includes a nut accommodating groove matched with the driving nut; the driving nut is installed in the nut accommodating groove, the small rod of the driving core rod extends into the driving nut and is threadedly engaged with the driving nut, and the driving core rod is installed in the expansion sleeve; the positioning of the expansion sleeve The resisting portion is axially resisted and positioned by the connecting member, and the rotating driving core rod moves the first driving cone toward the axial direction of the driving nut, the driving nut has no axial direction movement, and the first driving cone and the expansion sleeve expand the cone The face slides relatively and the expansion sleeve expands.
The method for connecting an expansion fastening structure according to claim 16, wherein the driving core member comprises a driving core rod, and the driving core rod comprises a small end of the light rod, and is connected to the small end portion and in the expansion sleeve. a taper surface for expansion, a driving cone formed by the driving cone surface, a straight light rod portion connected to the large end of the driving cone, and a straight portion of the straight light rod portion and radially protruding from the resisting portion of the straight light rod portion, a threaded portion connected to the resisting portion;

The driving core rod is tapped into the expansion sleeve, the positioning resisting portion of the expansion sleeve is axially resisted and positioned by the connecting member, the expansion sleeve has no axial movement, the driving cone and the expansion sleeve expand relative to the tapered surface, and the expansion sleeve expands. The resisting portion of the driving core rod is resisted by the expansion sleeve, and the driving core rod is mounted in position.
A method of connecting an expansion fastening structure according to claim 16, wherein said driving core member comprises a driving core rod, a driving nut engaged with said driving core rod; and a driving nut comprising said a driving cone formed by the driving taper surface, a threaded hole disposed at the axial center position; the driving core rod includes a small end portion provided with a threaded portion that cooperates with the threaded hole of the driving nut, and is connected to the small end end and expands in the expansion sleeve a tapered surface, a driving cone formed by the driving cone surface, a straight beam portion connected to the large end of the driving cone, connected to the straight beam portion and radially protruding from the resisting portion of the straight beam portion; The small rod of the driving core rod is screw-fitted with the driving nut, and the driving nut is installed in the driving core receiving space;

The positioning resisting portion of the expansion sleeve is axially resisted by the connecting member, and the expansion sleeve has no axial movement. The driving nut is screwed with the driving core rod, and the driving core rod is rotated to drive the driving nut and the driving cone to synchronously move relative to each other. The expansion of the body and the expansion sleeve is relatively slid with the tapered surface, and the expansion sleeve is expanded; the abutting portion of the driving core rod is resisted by the expansion sleeve, and the driving core rod is mounted in position.
A method for connecting an expansion fastening structure according to claim 16, wherein said driving core member comprises a core rod, a driving nut and a driving member; and the core rod comprises a core rod body provided with a threaded end, radial a core rod resisting portion protruding from the core rod body and away from the threaded end; the driving nut includes a nut body, and the driving cone surface is disposed on the nut body; the driving member includes a driving member body and is axially driven through a through hole of the body of the piece, the driving cone surface is disposed on the driving body;

a threaded end of the core rod passes through a through hole in the driving member, the core rod resisting portion axially abuts the driving member, and the threaded end of the core rod is screwed with the threaded hole of the driving nut;

The positioning resisting portion of the expansion sleeve is axially resisted by the connecting member, and the expansion sleeve has no axial movement, and the threaded end of the core rod is threadedly engaged with the threaded hole of the driving nut, and the rotating core rod makes the driving nut and the driving member synchronously Movement, the driving cone on the driving member slides relative to the expansion on the expansion sleeve, and the expansion sleeve expands; the resisting portion of the driving core rod is resisted by the expansion sleeve, and the driving core rod is mounted in position.
The method of connecting an expansion fastening structure according to claim 16, further comprising: a rigid washer sleeved on the expansion body of the expansion sleeve;

The connection method also includes:

Provide a rigid gasket;

The expansion member is selected according to the sum of the thicknesses of the two or more connected members to be connected, and the axial distance between the positioning resisting portion of the expansion member and the opposite surface of the resisting convex portion is greater than or equal to two or more connected members to be connected. The sum of the thicknesses;

When the axial distance between the positioning resisting portion of the expansion member and the opposite surface of the resisting convex portion is greater than the sum of the thicknesses of the two or more connected members to be connected, according to the positioning resisting portion of the expansion sleeve and the opposing surface of the resisting convex portion Selecting the thickness of the rigid gasket by subtracting the sum of the thicknesses of the two or more connected members to be joined;

A rigid gasket is mounted between the positioning abutment and the connected member, and/or between the convex portion and the connected member.
A method of joining an expansion fastening structure according to claim 25, wherein the specification for providing the thickness of the rigid gasket comprises one unit length, two unit lengths, and five unit lengths;

Selecting a thickness of rigid washer or a rigid washer of different thickness according to the axial distance between the positioning resisting portion of the expansion sleeve and the opposite surface of the resisting convex portion minus the thickness of the two or more connected members to be joined The combination.
An expansion fastening assembly comprising a drive core member and two or more expansion members; the expansion member forming an expansion sleeve for holding the drive core member;

Providing an expansion cone for driving the expansion sleeve to expand on each of the expansion members;

a driving core member accommodating space is disposed in the expansion sleeve, and the expansion cone surface is disposed on a wall of the driving core member accommodating space;

Providing a driving cone on the driving core member that cooperates with the expansion taper on each of the expansion sleeves;

The utility model is characterized in that: the per-valve expansion member comprises an expansion member body that cooperates with two or more holes in the connected member, and the one end of the expansion member body is axially positioned to the expansion sleeve, and the connected member is resisted and fixed. And radially locating the positioning abutting portion of the expansion member body, and at the other end of the expansion member body, there is further provided a resisting convex portion for abutting and fixing the connected member and radially protruding the expansion member body;

The positioning resisting portion on the expansion sleeve forms only one ring of independent ring that is broken at the joint position of the expansion member, and the abutting protrusion portion on the expansion sleeve forms only a ring of independent ring that is broken at the joint position of the expansion member;

The maximum distance between the positioning abutting portion and the axis of the expansion body is greater than the maximum distance from the convex portion to the axis of the expansion body.
The expansion fastening joint assembly according to claim 27, wherein the outer peripheral surface of the expansion member body is a cylindrical curved surface, and the positioning abutting portion is radially along the outer peripheral surface of the one end portion of the expansion member body. The protruding protrusion is formed to protrude radially along the outer peripheral surface of the other end portion of the expander body; the outer peripheral surface of the expander body has an outer diameter equal to or smaller than an aperture of the through hole of the connected member.
An expansion fastening joint assembly according to claim 27, further comprising a spring, a spring receiving groove is radially provided on an outer peripheral surface of each of the expansion members, and the expansion members of the two or more petals are held by the spring Forming the expansion sleeve together, the spring is completely accommodated in the spring receiving groove; in the unexpanded state of the expansion sleeve, the expansion cone on the expansion sleeve is huged on the driving cone surface; The positioning resisting portions are circumferentially distributed to form a broken independent ring shape, and the resisting convex portions on the expansion sleeve are circumferentially distributed to form a broken independent ring shape.
An expansion fastening joint assembly according to claim 27, wherein said drive core member comprises a drive core rod, a drive nut that cooperates with the drive core rod; the drive core rod includes a small rod provided with a thread, and a first driving cone formed by the driving cone surface connected to the small end, a first straight light rod portion connected to the large end of the first driving cone; the driving core housing accommodating space in an unexpanded state of the expansion sleeve Cooperating with the small rod driving the core rod, the first driving cone and the first straight light rod portion, the driving core housing accommodating space further comprises a nut receiving groove matched with the driving nut; the driving nut is installed in the nut receiving groove Inside, the small rod of the driving core rod extends into the driving nut and is threadedly engaged with the driving nut, and the driving core rod is installed in the expansion sleeve.
30. An expansion fastening assembly according to claim 30, further comprising a second drive cone formed by said drive cone;

The driving core rod further includes a connecting cone connected to the first straight beam portion at a large end, a second straight rod portion connected to the small end of the connecting cone, and the small end is connected to the second straight rod portion, a second driving cone formed by the driving cone surface, a third straight beam portion connected to the large end of the second driving cone, the driving core receiving space and the connecting cone and the second straight beam portion The second driving cone and a portion of the third straight beam portion cooperate.
30. An expansion fastening assembly according to claim 27, wherein said drive core member is a drive core rod, and the drive core rod includes a small end of the light rod, connected to the small end end and expanded for expansion within the expansion sleeve. a tapered surface, a driving cone formed by the driving cone surface, a straight light rod portion connected to the large end of the driving cone, and a resisting portion connected to the straight light rod portion and radially protruding from the straight light rod portion are disposed in the resisting portion a core member detaching mechanism on the end surface of the portion; the driving core member accommodating space in the unexpanded state includes a first accommodating space that cooperates with a small rod of the driving core rod, a driving cone, and a part of the straight light rod portion; The limiting mechanism that drives the core rod resisting portion away from the surface limit of the connected member and keeps the driving core rod in a position where the expansion sleeve is fully expanded.
An expansion fastening joint assembly according to claim 27, wherein said drive core member comprises a drive core rod, a drive nut mated with said drive core rod; and a drive nut comprising said drive cone surface a driving cone formed, a threaded hole disposed at a position of the shaft; the driving core rod includes a small end provided with a threaded portion that cooperates with a threaded hole of the driving nut, and is coupled to the small end and cooperates with a taper surface for expansion in the expansion sleeve a driving cone formed by the driving cone surface, a straight beam portion connected to the large end of the driving cone, connected to the straight beam portion and radially protruding from the resisting portion of the straight beam portion; the expansion sleeve is not expanded a state in which the driving core member accommodating space is engaged with a driving nut, a small end portion of the driving core rod, a driving cone, a partial straight light rod portion, and a resisting portion; the small rod of the driving core rod is screw-fitted with the driving nut Together, the drive The nut is mounted in the drive core housing space.
An expansion fastening joint assembly according to claim 27, wherein said drive core member comprises a drive core rod; and the drive core rod comprises a drive core rod body projecting on the drive core rod body for driving expansion a sleeve-expanding and contracting expansion-contracting projection; the driving taper surface for driving the expansion sleeve expansion is disposed on a side of the projection portion facing away from the positioning abutting portion, and the orientation of the projection portion is resisted One side of the portion forms a constricting recessed portion for contracting the expansion sleeve, and the driving taper surface on the driving core rod coincides with the taper direction of the conical recessed portion for contraction; the driving core member housing space includes the driving core The expansion and contraction of the rod is formed by the expansion and contraction accommodating groove in which the projection is fitted, and the expansion and contraction groove is formed in the expansion and contraction accommodating groove toward the groove wall of the positioning abutting portion, and the expansion taper surface is engaged with the drive taper surface of the drive core rod. The expansion and contraction accommodating groove faces away from the groove wall of the positioning abutting portion to form a contracting conical surface that engages with the conical recessed portion of the drive core rod.
An expansion fastening joint assembly according to claim 27, wherein a corresponding position of said drive core member accommodating space is formed on each of the valve expansion members, and a ridge or a recess portion is provided. The convex strip or the recessed portion of the expansion member is provided with the expansion taper surface; the drive core member is provided with a recess portion matching with the ridge on each of the expansion members, or a recess portion on each of the expansion members The mating ribs are provided with the drive taper on the rib or recess of the drive core.
An expansion fastening joint assembly according to claim 27, wherein said drive core member comprises a core rod, a drive nut and a drive member; and the core rod comprises a core rod body provided with a threaded end, radially protruding a core rod resisting portion on the core body away from the threaded end; the driving nut includes a nut body, a rib axially disposed on the nut body, axially penetrating the threaded hole of the nut body, on the rib of the driving nut The driving component comprises a driving component body, a protruding strip axially disposed on the driving component body, and a through hole extending through the driving component body in an axial direction, and is disposed on the protruding strip of the driving component The driving taper surface; the first recessed portion that cooperates with a corresponding rib on the driving nut, and the second recessed portion that cooperates with a corresponding rib on the driving member are disposed on the expansion member The threaded end of the core rod passes through the through hole in the driving member, the core rod resisting portion axially resists the driving member, and the threaded end of the core rod is screwed with the threaded hole of the driving nut; in the unexpanded state of the expansion sleeve, the driving core Included space and connected in one Ribs and the driving body, the stem body, the ribs on the drive nut and its mating body.
An expansion fastening joint assembly according to claim 27, wherein said drive core member comprises a core rod, a drive nut and a drive member; and the core rod comprises a core rod body provided with a threaded end, radially protruding a core rod resisting portion on the core rod body away from the threaded end; the driving nut includes a nut body axially penetrating the threaded hole of the nut body, and the driving cone surface is disposed on the driving nut; the driving member includes a driving member a body extending axially through the through hole of the driving body, wherein the driving cone is provided on the driving member; the threaded end of the core rod passes through the through hole in the driving member, and the core rod resisting portion axially resists The driving member, the threaded end of the core rod is screwed with the threaded hole of the driving nut; in the unexpanded state of the expansion sleeve, the driving core member accommodating space is matched with the driving member, the core rod body and the driving nut which are coupled together.
An expansion fastening joint assembly according to claim 27, wherein said positioning abutting portion has a tapered shape, and a tapered receiving portion for completely accommodating the positioning abutting portion is provided on the connected member adjacent to the positioning abutting portion. Set the hole.
An expansion fastening joint assembly according to claim 27, wherein said expansion fastening joint assembly further comprises a cap; said cap includes an expansion sleeve for receiving the projection member, or a receiving projection An expansion sleeve of the connector and a cavity of the driving core member are protruded from the bottom surface of the inner cavity, and a snap groove is formed on the expansion sleeve or the driving core member.
The expansion fastening structure of claim 27 further comprising a rigid gasket overlying the expansion member body of the expansion sleeve; between the positioning abutment portion of the expansion member and the expansion member body, and/or in expansion a chamfering or rounding between the resisting protrusion and the expansion body; a chamfering on the rigid washer matched with the chamfer on the expansion member, or a rounding on the rigid washer and the expansion member Rounding of the fit.