CN114151432A

CN114151432A - Anti-loosening riveting bolt and corresponding riveting tool

Info

Publication number: CN114151432A
Application number: CN202111414499.7A
Authority: CN
Inventors: 殷春阳; 贺贤娟; 陈纪平; 王光泰
Original assignee: Shanghai Pansheng Fastening Technology Co ltd; Shanghai Wharton Industrial Co ltd; Jiangsu Hooke Fastening System Technology Co ltd
Current assignee: Shanghai Pansheng Fastening Technology Co ltd; Shanghai Wharton Industrial Co ltd; Jiangsu Hooke Fastening System Technology Co ltd
Priority date: 2021-11-25
Filing date: 2021-11-25
Publication date: 2022-03-08
Anticipated expiration: 2041-11-25
Also published as: CN114151432B

Abstract

The invention relates to the technical field of connection of threaded fasteners, in particular to a loosening-preventing riveting bolt, wherein the diameters of all the lengths of bolt rods of the bolt are consistent; the bolt shaft has opposite thread sections in the length engaging the rivet lock ring at the projecting end. The riveting tool for riveting the bolt is formed by driving an extrusion die of an outer cylinder and a tension sleeve of an inner cylinder to axially move by hydraulic power, the inner wall of the front end part of the extrusion die is matched with the shape of the locking ring containing the flange, and the inner wall of the front end of the tension sleeve is provided with a section of thread which is the same as that of the outer side of the extending end of the bolt rod. Never loosening can be achieved theoretically. Riveting extrusion force can be increased, the riveting bolt with the same shape, quality and weight can provide larger tensile load, the size can be reduced, the material consumption is reduced, the weight of the riveting bolt is reduced, and the cost is reduced. The riveting tool does not need the three-jaw collet chuck in the prior art, and has the advantages of simple structure, low cost, convenient use, few faults and easy popularization.

Description

Anti-loosening riveting bolt and corresponding riveting tool

Technical Field

The invention relates to the technical field of connection of threaded fasteners, in particular to a structure of a riveting bolt and a corresponding tool for riveting.

Background

The fastener is the most extensive mechanical part of application occasion, relates to machinery, chemical industry, petroleum, building, traffic, bridge, car, boats and ships, space flight and aviation, military national defence and almost everywhere do not use in not having the field.

The fastener is a generic name of a type of mechanical parts used when two or more parts (or members) are fastened and connected as a whole, and is also referred to as a standard part in the market. The most common is a bolt connection structure, and a bolt is a fastener consisting of a head and a screw (a cylinder with external threads), and needs to be matched with a nut for fastening and connecting two parts with through holes. This type of connection is known as a bolted connection and when it is desired to separate two parts, the two parts can be easily separated by unscrewing the nut from the bolt.

This approach is the most traditional and uses the most structure. However, in a long history of use, the user feels dissatisfied in some occasions, and as the screw of the bolt is provided with the thread, the nut naturally loosens along the thread direction after fastening and using for a long time, so that the gasket and the spring gasket are improved to some extent, and the looseness caused by vibration can be resisted and reduced properly.

In some cases of fastening, the fastening is performed in a one-time and permanent manner without unscrewing after the fastening, for example, in the assembly of buildings and the construction of bridges, the engagement is desired to be durable, the tension cover is preferably tightened, and the rivet connection is not required to be disassembled and split open, and thus, a rivet connection mode has been invented, and the most of the structures are rivets. However, the preload of conventional rivets is relatively low and the preload of a set of rivets is widely discrete and does not meet the requirements of a friction type connection of steel structures.

In order to overcome the defects of the traditional rivet, people think of a riveting bolt connecting mode, a bolt penetrates two parts with through holes of a connecting belt to be fastened and then is exposed for a section, a metal locking ring is sleeved, the periphery of the metal locking ring is extruded and deformed by an extrusion force mode, the inner wall of the metal locking ring and the grains of the bolt are embedded with each other to form inner grains, and the locking ring and the bolt are tightly gripped together and tightly fastened without falling. The inner wall of the metal lock ring is deformed by cold work, and due to the characteristic of cold work hardening of metal materials, the hardness and the strength of the lines are obviously improved, so that the metal lock ring has a good occlusion effect and very strong fastening force. However, the common threaded connection can be loosened to different degrees over time, the riveting mode opens a new idea for people, the bolt is formed by sleeving, extruding and deforming at a later stage, the defects of the bolt can be completely corrected, the bolt is not provided with the spiral threads, and a circle of annular grooves which are arranged in a sequential mode are arranged during design, so that the shape structure can effectively avoid the threaded connection from being loosened due to vibration and further connection failure.

However, the requirement of people for products is endless, and further improvement and promotion are further desired on the basis of the original requirement.

It is analyzed that the effective cross-sectional area of the ring groove shaped rivet is calculated according to the minimum diameter of the ring groove, which is smaller than the nominal cross-sectional area of the bolt of the same diameter, and therefore, the minimum tensile load is also small.

After a bolt for riveting the bolt penetrates through a through hole of a fastened piece, the other side is sleeved with a locking ring for riveting (the locking ring is equivalent to a nut after riveting), the used riveting tool is composed of two cylindrical parts which can slide mutually in the axial direction, an inner cylinder pulls an extending end of the bolt to pull outwards, an outer cylinder pushes against the end part of the locking ring, the outer cylinder extrudes the outer cylinder of the locking ring to press the material on the inner wall of the locking ring into a thread groove of the bolt under the drive of a hydraulic system to form a female ring groove, and the female ring groove is fastened together with a male ring groove on the bolt in an occluded manner similar to a nut.

In order to pull one end of the bolt, the bolt head of the riveting bolt of the prior art must have a short tail with a section of male ring groove with reduced diameter, so that the inner wall of the end part of the inner cylinder of the riveting tool also has a section of female ring groove with consistent diameter for matching and pulling outwards. The reason for this diameter reduction is that, in order to set up the three-jaw collet chuck mechanism in the annular groove that the end of the bolt should be grasped and clamped in the end of the inner cylinder, open the three-jaw collet chuck during clamping, then close up again, this mechanism must be held in the outer cylinder after closing up again, do not influence each other and move axially, therefore have to reduce the diameter of the end of the bolt, however this reduction brings very big drawback, has greatly reduced the minimum tensile load of the whole bolt, namely make the pretightening force after the bolt riveting reduce, near the lower limit of the national standard specified value, this state will reduce the bolt connection pair antifatigue ability after installing, theory and practice prove, the larger the pulling force that the bolt receives while riveting, the clamping force that the lock ring locks after riveting is also larger, this has not only improved the antifatigue ability after installing, improved the stability of the structure at the same time. The tension that the bolt can bear depends on the diameter of the bolt and on the minimum diameter, and due to the structure of the riveting tool, the riveting bolt has to adopt a structure that the tension of the bolt with the same diameter cannot be exerted, a larger extrusion force can be given, and the fastening force cannot be fully exerted, which is also a heavy loss and a heavy cost.

The connection mode of the riveting bolt has been proposed for decades, and the industry people do not have any improvement and change for about eighty years since the second war, and the technical personnel in the field do not apply force to weaken the fastening tight joint degree in the axial direction when selecting the ring groove to install, and have loosening risk and hidden trouble when selecting the thread. Sometimes the bulk and weight have to be increased or other means have to be used, which of course also have other undesirable consequences. In addition, in some occasions, such as large-scale overpasses, rails, viaducts and aerospace flight vehicles, the technical value, the economic value, the scientific value, the social value and the market value of the flyover vehicles are slightly improved, the technical value, the economic value, the scientific value, the social value and the market value of the flyover vehicles cannot be measured, people wander for decades, methods and measures for solving and improving the flyover vehicles are expected, and riveting tools for realizing corresponding riveting bolts can be provided.

Disclosure of Invention

The invention aims to provide a riveting bolt connecting structure which has strong tensile strength and can prevent looseness caused by vibration or natural factors over time and a tool used for riveting the riveting bolt connecting structure.

The purpose of the invention is realized by the following technical scheme:

a loosening-proof riveting bolt is composed of a bolt body,

the through-hole is seted up to two or more than two workpieces that supply fastening connection, and the bolt penetrates the through-hole from one side, and the fastening face of bolt head supports the outer wall of through-hole one side, its characterized in that:

the bolt rod of the bolt extends out of the outer wall of the other side, and the diameters of all the lengths of the bolt rods of the bolt are consistent;

the length of the extended end of the bolt rod which is occluded with the riveting lock ring is provided with a thread section with two opposite rotation directions;

the locking ring with the bottom turned outwards is sleeved at the extending end of the bolt rod, the bottom surface of the locking ring is tightly attached to the outer wall of the other side of the locking ring, and the locking ring is extruded, deformed, formed and occluded on the thread of the bolt rod through a riveting tool and fastened on the outer wall of the other side of the locking ring.

After the technical scheme is adopted for riveting, the material of the locking ring is simultaneously extruded into the thread grooves of the left-handed threads and the right-handed threads, so that the locking ring and the bolt are tightly combined together and cannot be displaced mutually.

It is well known to those skilled in the art that when the locking ring is engaged with a length of thread segments having opposite handedness, the direction of the force and the direction of the breaking force caused by the thread direction are opposite, so that it is impossible to generate the problem of loosening over time and over time after the riveting operation.

According to the technical scheme, the end of the bolt rod is not provided with a section with a reduced diameter, so that the problem that the axial weakening of the bearing tension load is avoided in riveting, the extrusion force of riveting can be increased, and the associated benefits are brought.

Further: the length of the extending end of the bolt rod meshed with the riveting lock ring is provided with thread sections with the same length and opposite screwing directions.

Further: and a transition region with the diameter not smaller than the diameter of the blank for manufacturing the threads is arranged between the two opposite-turning threads at the extending end of the bolt rod.

And further: the axial width of the bolt rod in the transition area is less than or equal to one thread pitch.

Further: the inner diameter of the locking ring is larger than or equal to the outer diameter of the bolt rod.

The riveting tool is formed by an extrusion die of an outer cylinder and a tension sleeve of an inner cylinder which are forced by hydraulic power to axially extrude and move mutually, the shape of the inner wall of the end part of the extrusion die is consistent with that of a lock ring with the bottom part turned outwards, the inner wall of the end part of the tension sleeve is provided with threads which are the same as the rotation direction and the nominal parameters of the outermost section of the extending end of the bolt rod, can rotate and can move axially along with the rotation and the thread matching.

By adopting the technical scheme, on the basis of the structure of the anti-loosening riveting bolt, two or more workpieces for fastening connection are provided with through holes, the bolt penetrates into the through holes from one side, the fastening surface of the bolt head is propped against the outer wall of one side of the through holes, the bolt rod of the bolt extends out of the outer wall of the other side, and the diameters of all the lengths of the bolt rod are consistent; a locking ring containing a flange is sleeved at the extending end of the bolt rod, and the flange surface is tightly attached to the outer wall of the other side.

The invention relates to a riveting tool front sleeve for a loosening-proof riveting bolt, wherein a tension sleeve rotates, threads on the inner wall of the front end are meshed and connected with threads on the extending end of a bolt rod, at the moment, hydraulic power is started to push an extrusion die forwards to form axial relative extrusion movement with the tension sleeve, the inner wall of the front end part of the extrusion die is matched with the shape of a locking ring with a flange, materials on the inner wall of the locking ring are extruded and pressed into a thread groove of the bolt by extruding an outer cylinder of the locking ring to form corresponding threads, and the nut is fastened with the meshes on the bolt like a nut, but has bidirectional threads and cannot be loosened forever without damaging the nut.

Further: the pull sleeve is driven to rotate by a motor.

The technical scheme has the advantages and beneficial effects.

As the extended end of the bolt rod is meshed with the riveting lock ring, the threaded section with the opposite two rotation directions is arranged in a section of length, the common knowledge deduces that the bolt rod can never loosen theoretically.

The end of the bolt rod is not provided with a section with a reduced diameter, so that the problem that the axial weakening of the bearing tension load is avoided in riveting, the extrusion force of riveting can be increased, and the technical advantages brought by the structure are different. Thereby:

the riveting bolt with the same shape, mass and weight can provide larger tensile load, and has great use amount for aviation, spaceflight, overhead bridges and other occasions and very high value in terms of weight.

Under the condition of needing the same tensile force and fastening force, the size can be reduced, the material consumption is reduced, the weight of the riveting bolt is reduced, the cost is reduced, and the riveting bolt has competitive advantages in any occasions.

One kilogram of the manned spacecraft is reduced in weight, so that one hundred thousand of dollars can be saved, and a large number of fasteners are used in the manufacturing process, so that the manned spacecraft has the advantages of structural change, light weight, enhanced fastening force and great significance.

The patent has the value of market value, popularization and application value, wide application occasions and great creativity and contribution to the patent.

Although the structure is a small change, the effect is significant and the significance is particularly great, the structure of riveting the bolt in a threaded mode has been published for decades, but the professional always stays in the original structural form, and the patent appearing after a long time is difficult to see and is not obvious at all, and the creative characteristics of the patent are met.

The riveting tool does not need a three-jaw spring chuck in the prior art, has simple structure, low cost, convenient use, less faults and easy popularization, and completely achieves the function of riveting that the diameters of all the lengths of a bolt rod are consistent, and a threaded section anti-loosening riveting bolt pair with opposite rotation directions is arranged in a section of length meshed with a riveting locking ring on the bolt rod.

Drawings

FIG. 1 is a view showing a structure of a loosening-preventing rivet bolt, a bolt shank and a lock ring in a disengaged state according to the present invention;

FIG. 2 is a view showing the structure of a locking bolt, a bolt shank and a lock ring in a state of being screwed together with a riveting tool according to the present invention;

FIG. 3 is a view of FIG. 2 showing a state in which the extrusion die is screwed with the protruding end of the bolt shank, and the locking ring is extruded by being pulled axially outward;

FIG. 4 is a view of a prior art stud having a reduced diameter section at the end of the bolt of the clinching bolt;

FIG. 5 is a schematic structural view of a riveting tool three-jaw collet in an open state for a riveting bolt short tail nail of the prior art;

FIG. 6 is a schematic structural view showing a state that a three-jaw collet chuck of a riveting tool is closed to press a lock ring in a riveting bolt short-tail nail in the prior art.

In the figure, 1 is the bolt shank, 12 is the transition zone, 11 is one-way thread, 13 is another-way thread, 2 is the lock ring, 3 is the workpiece, 4 is the tension sleeve, 5 is the extrusion die.

Detailed Description

The structure of the present invention will be described in further detail below with reference to the accompanying drawings.

A loosening-proof riveting bolt is composed of a bolt body,

the through-hole is seted up to two or more than two work pieces 3 that supply fastening connection, and the bolt penetrates the through-hole from one side, and the fastening face of bolt head supports the outer wall of through-hole one side, its characterized in that:

a bolt rod 1 of the bolt extends out of the outer wall of the other side, and the diameters of all the lengths of the bolt rod 1 are consistent;

a locking ring 2 containing a flange is sleeved at the extending end of the bolt rod 1, the flange surface is tightly attached to the outer wall of the other side, is extruded and deformed by a riveting tool, is formed and occluded on the thread of the screw rod 1, and is tightly pressed on the outer wall of the other side;

the threaded

sections

11 and 13 with opposite screwing directions are arranged in a length of the protruding end of the bolt rod 1 meshed with the riveting lock ring 2; the good effect is that the two sections have the same or similar length and are loaded by the close tension, which is beneficial to the service life of the screw.

A transition region 12 with the diameter not smaller than the diameter of a raw material for manufacturing the threads is arranged between two opposite threads in the rotating direction at the extending end of the bolt rod 1, and the axial width is smaller than or equal to one thread pitch. The transition area 12 is arranged between the two opposite-turning-direction threads, so that the screw is convenient and beneficial to manufacture and use according to the requirement.

The inner diameter of the locking ring 2 is larger than or equal to the outer diameter of the bolt 1, and the locking ring 2 moves and slides on the outer surface of the bolt 1 in the riveting process, so that the technical requirement exists that the larger gap is about 0.2-0.4 mm for the bolt with the diameter of about 10 mm. Even in correspondence with the projections 21, it is necessary to be able to smoothly rotate the axial entry connection.

A riveting tool for the anti-loosening riveting bolt is formed by an extrusion die 5 of an outer cylinder and a tension sleeve 4 of an inner cylinder, wherein the extrusion die 5 and the tension sleeve 4 are forced to move axially by hydraulic power, the shape of the inner wall of the end part of the extrusion die 5 is matched with that of a lock ring 2 containing a flange, the inner wall of the end part of the tension sleeve 4 is provided with threads which have the same rotating direction and nominal parameters as those of a section of the outer side of the extending end of a bolt rod, and the tension sleeve 4 can be rotatably connected and moves axially.

The pull sleeve 4 is driven to rotate by a motor. The pull sleeve is convenient to rotate and is in threaded connection with a section of the outer side of the extending end of the bolt rod, synchronous movement is provided along with axial movement of the pull sleeve 4, and relative extrusion movement opposite to that of the extrusion die 5 is generated. The pull sleeve 4 can be rotated by hand, but as a special tool, the pull sleeve is more convenient and simpler to drive by adopting a motor.

The present invention is not limited to the above embodiments, and based on the technical solutions disclosed in the present invention, those skilled in the art can make some substitutions and modifications to some technical features without creative efforts, and these substitutions and modifications are all within the protection scope of the present invention.

Claims

1. A loosening-proof riveting bolt is composed of a bolt body,

the through-hole is seted up to two or more than two work pieces (3) that supply fastening connection, and the bolt penetrates the through-hole from one side, and the fastening face of bolt head supports the outer wall of through-hole one side, its characterized in that:

a bolt rod (1) of the bolt extends out of the outer wall of the other side, and the diameters of all the lengths of the bolt rods (1) are consistent;

a locking ring (2) containing a flange is sleeved at the extending end of the bolt rod (1), the flange surface is tightly attached to the outer wall of the other side, is extruded, deformed, formed and occluded on the thread of the screw rod (1) through a riveting tool, and is tightly pressed on the outer wall of the other side;

and the length of the protruding end of the bolt rod (1) meshed with the riveting lock ring (2) is provided with thread sections (11, 13) with opposite rotation directions.

2. The loosening-resistant clinch bolt of claim 1, wherein:

the length of the protruding end of the bolt rod (1) meshed with the riveting lock ring (2) is provided with thread sections (11, 13) with the same length and opposite two rotation directions.

3. The loosening-resistant clinch bolt of claim 1, wherein: a transition region (12) with the diameter not smaller than the diameter of a thread blank is arranged between two opposite-turning threads at the extending end of the bolt rod (1), and the axial width is smaller than or equal to one thread pitch.

4. The loosening-resistant clinch bolt of claim 1, wherein: the inner diameter of the locking ring is larger than or equal to the outer diameter of the bolt (1).

5. A riveting tool for riveting a loosening-resistant rivet bolt according to claim 1, wherein: the riveting tool is formed by driving an extrusion die (5) of an outer cylinder and a tension sleeve (4) of an inner cylinder to axially move by hydraulic power, the inner wall of the front end part of the extrusion die (5) is matched with the shape of the lock ring (2) containing the flange, the inner wall of the front end of the tension sleeve (4) is provided with threads which have the same rotating direction and nominal parameters as those of a section of the outer side of the extending end of the bolt rod, and the tension sleeve (4) can be rotatably connected and axially moves along with the tension sleeve.

6. Riveting tool according to claim 5, wherein the pull sleeve (4) is rotated by a motor.