WO2022121237A1

WO2022121237A1 - Teeth-embedded motion-stop forward/reverse rotation drill pipe

Info

Publication number: WO2022121237A1
Application number: PCT/CN2021/094347
Authority: WO
Inventors: 辛德忠; 陈航; 万军; 蒲剑; 王清峰; 唐敏; 吕晋军; 刘小华; 杨林; 张始斋; 马振纲; 雷万年; 万园; 梅安平; 周富佳; 秦怡; 李淑健
Original assignee: 中煤科工集团重庆研究院有限公司
Priority date: 2020-12-07
Filing date: 2021-05-18
Publication date: 2022-06-16
Also published as: CN112664147B; AU2021277750A1; CN112664147A

Abstract

Provided is a teeth-embedded motion-stop forward/reverse rotation drill pipe, comprising a pipe body (2); the front end of the pipe body (2) is provided with a male joint (3); the rear end is provided with a female joint (1) which can be threaded into the male joint (3); the pipe body (2), the male joint (3), and the female joint (1) all are hollow structures to form an axially interpenetrating central bore; the central bore is provided with a drive rod (6) slidingly connected thereto; the front end of the drive rod (6) is provided with a drive pin passing through a slide groove (306) disposed on the male joint (3) and connected to a slide sleeve (5) sleeved on the male joint (3); the front end of the slide sleeve (5) has a plurality of tooth embedding teeth which can be fitted with the rear end of the female connector (1) and used for circumferential locking, comprising a long tooth and a plurality of short teeth; the length of engagement of the long tooth is longer by h than the length of engagement of the short teeth, h being less than the pitch p of the male connector (3) fitted with the female connector (1).

Description

A kind of tooth claw stop type forward and reverse drill pipe

technical field

The invention belongs to the technical field of coal mine drilling, and relates to a tooth claw stop type forward and reverse drill pipe.

Background technique

In the current drilling operations of various engineering holes in the well, threaded connections are generally used between the front and rear drill pipes. During the drilling process, the drill pipe can only be rotated in the forward direction, and will be loosened in the reverse direction. During the drilling process, accidents such as sticking and holding of the drill are very likely to occur. At this time, if you try to relieve the sticking and holding of the drill by alternately reversing the forward and reverse directions of the drill pipe, the drill pipe will be tripped and the drill will be lost. From the perspective of drilling technology, through the alternate rotation of the drill pipe and the reciprocating hole sweeping, it is possible to enhance the slag discharge and release the sticking and pressure relief, so as to avoid the occurrence of sticking and holding the drill.

In order to solve the problem of reversal of drill pipe, two kinds of structural forms, such as form connection and spline pair connection, have appeared successively. Most of the joints use "triangular", "hexagonal" and other polyhedral cylindrical surface structures to transfer the positive and negative bidirectional torque, and at the same time combine the pin positioning to bear the axial load of the drill pipe; the spline pair connection adopts the internal , The external spline is matched to transmit the circumferential torque, and the axial load is still positioned by the pin connection. Although the above connection method can realize the forward and reverse bidirectional rotation of the drill pipe, the loading and unloading process is cumbersome and requires manual installation or removal of the pins.

In recent years, the technology and equipment of coal mine automatic drilling rigs have become more and more mature, and the number of applications has increased year by year. Its high degree of automation and good safety have become the development trend of coal mine drilling rigs. During the construction process of the automatic drilling rig, if there are accidents such as drilling or sticking, the automatic drilling rig can automatically judge through the intelligent anti-drilling program, and control the relevant mechanism to drive the drill pipe forward and reverse to realize automatic release of the stuck. To this end, it is necessary to develop a drill pipe with high reliability, automatic make-up and break-out and forward and reverse bidirectional rotation without tripping.

SUMMARY OF THE INVENTION

In view of this, the purpose of the present application is to provide a positive-reversing drill rod of a toothed stop type, so as to solve the problem of thread tripping when the drill rod is rotated in both directions.

To achieve the above object, the present invention provides the following technical solutions:

A positive-reversing drill rod of a tooth-clamping stop type comprises a rod body, the front end of the rod body is provided with a male joint, the rear end is provided with a female joint which can be threadedly connected with the male joint, and the rod body, the male joint and the female joint are all hollow structures to A central hole that penetrates through each other in the axial direction is formed; the central hole is provided with a transmission rod that is slidably connected with it, and the front end of the transmission rod is provided with a transmission through the sliding groove opened on the male joint and connected with the sliding sleeve set on the male joint. pin; the front end of the sliding sleeve has a plurality of teeth cogs that can cooperate with the rear end of the female joint for circumferential locking, including a long tooth and a plurality of short teeth, the meshing length of the long teeth is longer than the meshing length of the short teeth h, h It is less than the pitch p between the male joint and the female joint; when the sliding sleeve is located at the axial limit set on the male joint, the two adjacent drill rods can be tightened and only a pair of long teeth are in contact, and the contact length is h1, 0< h1≤h; the sliding sleeve can move from the axial limit to the front end of the male joint along the axial direction of the male joint, so that the teeth of the two adjacent drill rods are fully meshed with the teeth.

Optionally, the rear end surface of the female joint is provided with inner teeth forward in the axial direction, and the inner teeth cogs include a first long tooth and a plurality of short teeth; the front end surface of the sliding sleeve is arranged axially backward. There are external teeth, which include second long teeth and several short teeth.

Optionally, it also includes a locking mechanism that can lock the transmission rod in a state of full tooth engagement and only long tooth contact.

Optionally, the locking mechanism is an elastic telescopic mechanism located in a limit hole opened on the female connector, including a positioning portion that can extend into a locking groove opened at the rear end of the transmission rod, and the locking mechanism is connected to the lock. When the positions of the locking grooves correspond, the positioning part of the locking mechanism can extend into the locking groove to realize the axial limit of the transmission rod relative to the female joint; the locking groove includes a front locking groove arranged along the axial direction of the transmission rod and The rear locking groove corresponds to the position of the front locking groove when the sliding sleeve is at the axial limit position, and the locking mechanism corresponds to the position of the rear locking groove when the sliding sleeve is fully engaged with the male joint.

Optionally, the front locking groove and the rear locking groove are arc-shaped cross-section grooves around the circumference of the transmission rod.

Optionally, the locking mechanism includes a blocking block, an elastic piece and a positioning piece, the positioning piece is slidably connected to the end of the limiting hole close to the central hole, the blocking block is fixed on the end of the limiting hole away from the central hole, and the elastic piece is located at the end of the limiting hole. between the block and the positioning piece.

Optionally, the limit hole is a stepped hole, and its diameter increases in turn from the inside to the outside along the radial direction of the female joint, including a guide section, a limit section and A fixed segment, a clamping block is fixed in the fixed segment, and a positioning piece is slidably connected in the guide segment; the positioning piece is a stepped shaft, including a guide shaft segment slidingly matched with the guide segment, one end of the guide shaft segment close to the central hole has a positioning portion, and the other end is provided with a positioning portion. One end is provided with a limit shaft section, the limit shaft section is located in the limit section of the limit hole, and the shaft diameter of the limit shaft section is larger than the diameter of the guide section of the limit hole.

Optionally, when two adjacent drill rods are screwed tightly, the front end face of the male joint is in contact with the transmission rod of the other drill rod.

Optionally, the male joint includes a tightening section, a threaded section and a connecting section arranged in sequence, wherein the connecting section is fixedly connected with the rod body, and the circumferential direction of the connecting section is provided with an outer spline matching the inner spline arranged on the sliding sleeve. Splines, the circumferential direction of the threaded section is provided with an external thread that matches the internal thread provided on the female joint. When two adjacent drill rods are screwed tightly, the front end surface of the top tightening section is in contact with the rear end surface of the transmission rod of the other drill rod. .

Optionally, the transmission rod includes a front section, a middle section and a rear section arranged in sequence; the front section is provided with a front water hole communicating with the central hole, and the front water hole includes a front axial opening that opens inward from the front end of the front section. The water hole and the front radial water hole communicated with the front axial water hole and arranged radially along the front section; the rear section is provided with a rear water hole, and the rear water hole includes a rear axle opened inward from the rear end of the rear section The water hole and the rear radial water hole communicated with the rear axial water hole and radially arranged along the rear section.

Optionally, p-h=2˜4 mm.

The beneficial effects of the present invention are:

1. The present invention is easy to achieve accurate meshing of the meshing teeth when the drill rods are connected by setting the long and short teeth that mesh gradually, solves the problem of easy dislocation of the meshing teeth when the drill rods are connected, and further improves the reliability of the meshing when the two drill rods are connected.

2. In the present invention, after the threads of the two drill rods are tightened, the front end surface of the male joint is in contact with the transmission rod of the other drill rod, so as to avoid the loosening of the two drill rods due to the vibration of the drilling process.

3. The present invention realizes the function that the forward and reverse bidirectional rotation threads of the threaded connection drill pipe will not trip; at the same time, the locking and loosening of the tooth cogs are realized by a simple sliding sleeve translation back and forth, which is helpful for The automatic loading and unloading of reversible drill pipes can be realized, which can provide technical support for automatic drilling in coal mines.

Other advantages, objects, and features of the present invention will be set forth in the description that follows, and will be apparent to those skilled in the art based on a study of the following, to the extent that is taught in the practice of the present invention. The objectives and other advantages of the present invention may be realized and attained by the following description.

Description of drawings

In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be preferably described in detail below with reference to the accompanying drawings, wherein:

Fig. 1 is the structure schematic diagram one (stopping state) of the present invention's tooth claw stop type forward-reverse drill pipe;

Fig. 2 is the structural schematic diagram 2 of the tooth claw stop type forward and reverse drill pipe of the present invention;

Fig. 3 is the structural representation of drill pipe body;

Fig. 4 is the structural schematic diagram 1 of the sliding sleeve;

Fig. 5 is the structural schematic diagram 2 of the sliding sleeve;

6 is a schematic structural diagram of a positioning member;

Fig. 7 is the structural representation of the transmission rod;

FIG. 8 is a schematic diagram of a state where the thread is fully screwed in and the long teeth are blocked;

Fig. 9 is the top view of Fig. 8 (claw part);

Fig. 10 is the schematic diagram of the completed state of the upper drill pipe (that is, the initial state of the lower drill);

Fig. 11 is a plan view of Fig. 10 (part of a tooth claw).

Reference signs: female joint 1, rod body 2, male joint 3, rectangular pin 4, sliding sleeve 5, transmission rod 6, positioning member 7, elastic member 8, clamping block 9, front end drill pipe 10, upper drill pipe 11, Drill-down drill pipe 12, internal tooth cog 101, first long tooth 101a, conical internal thread 102, sliding hole 103, limit hole 104, backstop shaft 301, conical external thread 302, water hole 303, jack 304 , external splines 305, sliding grooves 306, shaft shoulders 307, through holes 308, external cogs 501, internal splines 502, fixing holes 503, second long teeth 501a, front mounting section 601, front water holes 602, The rear mounting section 603 , the rear water passage hole 604 , the front locking slot 605 , the rear locking slot 606 , the rectangular slot 607 , the large end 701 and the small end 702 .

Detailed ways

The embodiments of the present invention are described below through specific specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the drawings provided in the following embodiments are only used to illustrate the basic idea of the present invention in a schematic manner, and the following embodiments and features in the embodiments can be combined with each other without conflict.

Among them, the accompanying drawings are only used for exemplary description, and represent only schematic diagrams, not physical drawings, and should not be construed as limitations of the present invention; in order to better illustrate the embodiments of the present invention, some parts of the accompanying drawings will be omitted, The enlargement or reduction does not represent the size of the actual product; it is understandable to those skilled in the art that some well-known structures and their descriptions in the accompanying drawings may be omitted.

The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there are terms “upper”, “lower”, “left” and “right” , "front", "rear" and other indicated orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the indicated device or element must be It has a specific orientation, is constructed and operated in a specific orientation, so the terms describing the positional relationship in the accompanying drawings are only used for exemplary illustration, and should not be construed as a limitation of the present invention. situation to understand the specific meaning of the above terms.

Referring to Figures 1 to 11, a tooth-clamping type forward and reverse drill pipe includes a drill pipe body. The drill pipe body includes a rod body 2. The front end of the rod body 2 is provided with a male joint 3, and the rear end is provided with a male joint that can be connected with the male joint. 3. The threaded connection of the female joint 1, the rod body 2, the male joint 3 and the female joint 1 are all hollow structures to form a central hole that penetrates through each other axially; There is a transmission pin connected to the sliding sleeve 5 sleeved on the male joint 3 through the sliding groove 306 opened on the male joint 3 to realize the axial linkage between the transmission rod 6 and the sliding sleeve 5; the front end of the sliding sleeve 5 has A plurality of tooth cogs that can be mutually matched with the rear end of the female connector 1 for circumferential locking, including a long tooth and a number of short teeth. The pitch p matched by the female joint 1; the male joint 3 is provided with an axial limit for limiting the axial movement position of the sliding sleeve 5. When the sliding sleeve 5 is located at the axial limit position, the two adjacent drill rods can be tightened And there is only one pair of long teeth in contact, the contact length is h1, 0<h1≤h; the sliding sleeve 5 can move from the axial limit to the front end of the male joint 3 along the axial direction of the male joint 3 to make the adjacent two drill pipe teeth Cog full tooth meshing.

The rear end surface of the female joint 1 is provided with inner teeth 101 forward in the axial direction, and the inner teeth 101 include a first long tooth 101a and several short teeth; the front end surface of the sliding sleeve 5 is provided with outer teeth in the axial direction backward The cog 501, the external cog 501 includes a second long tooth 501a and several short teeth.

The sliding groove 306 of the present invention can be provided on one side of the central hole, or can be symmetrically provided on both sides of the central hole, preferably on both sides. The cross section of the drive pin can be circular or polygonal, preferably rectangular.

The present invention also includes a locking mechanism that can lock the transmission rod 6 in a state of full tooth engagement and only long tooth contact. The locking mechanism can be an elastic telescopic mechanism located in the limiting hole 104 opened on the female connector 1, including a positioning portion that can extend into the locking groove opened at the rear end of the transmission rod 6, between the locking mechanism and the locking groove. When the position of the locking mechanism corresponds to the corresponding position, the positioning part of the locking mechanism can automatically extend into the locking groove to realize the axial limit of the transmission rod 6 relative to the female joint 1; The groove 605 and the rear locking groove 606 have the same shape as the front locking groove 605 and the rear locking groove 606. When the sliding sleeve 5 is at the axial limit position, the locking mechanism corresponds to the position of the front locking groove 605. The locking mechanism corresponds to the position of the rear locking groove 606 when the sliding sleeve 5 is fully engaged with the male joint 3 .

The locking mechanism includes a blocking block 9, an elastic member 8 and a positioning member 7. The positioning member 7 is slidably connected to the end of the limiting hole 104 close to the central hole, the blocking block 9 is fixed to the end of the limiting hole 104 away from the central hole, and the elastic member 8 It is located between the block 9 and the positioning member 7; the elastic member 8 can be a compression spring or an elastic column.

Preferably, both the front locking groove 605 and the rear locking groove 606 are arc-shaped sectional grooves around the transmission rod 6 .

Preferably, the limiting hole 104 is a stepped hole, and its diameter increases in turn from the inside to the outside along the radial direction of the female connector 1 , and includes a guide section, a limit section and a fixing section that are sequentially arranged from the inside to the outside along the radial direction of the female connector and have increasing diameters. A block 9 is fixed in the fixed section, and a positioning member 7 is slidably connected in the guiding section; the positioning member 7 is a stepped shaft, including a guiding shaft section slidingly matched with the guiding section, and one end of the guiding shaft section close to the central hole has a positioning part , the other end is provided with a limit shaft section, the limit shaft section is located in the limit section of the limit hole 104 , and the shaft diameter of the limit shaft section is larger than the guide section diameter of the limit hole 104 .

Preferably, when two adjacent drill rods are screwed tightly, the front end of the male joint 3 is in contact with the transmission rod 6 of the other drill rod.

Preferably, the male joint 3 includes a tightening section, a threaded section and a connecting section arranged in sequence, wherein one end of the connecting section is fixedly connected to the rod body 2 , and the circumferential direction of the connecting section is provided with an internal spline 502 arranged on the sliding sleeve 5 . Matching external splines 305, the circumferential direction of the thread segment is provided with an external thread that matches the internal thread provided on the female joint 1. When the two adjacent drill rods are threadedly tightened, the front end surface of the top tightening segment and the rear of the transmission rod 6 are provided. End face contact to prevent loosening due to vibration during drilling.

Preferably, the transmission rod 6 includes a front section, a middle section and a rear section arranged in sequence; the front section is provided with a front water hole 602 communicating with the central hole, and the front water hole 602 includes a front axial opening from the front end of the front section. The water hole and the front radial water hole communicated with the front axial water hole and arranged radially along the front section; the rear section is provided with a rear water hole 604, and the rear water hole 604 includes a rear water hole opened inward from the rear end of the rear section. The rear axial water hole and the rear radial water hole communicated with the rear axial water hole and radially arranged along the rear section.

Preferably, p-h=2˜4 mm.

The invention not only solves the problem that the threaded connection between the drill pipes will be released when the existing drill pipes are reversed, resulting in the loss of the drill, but also realizes the automatic loading and unloading of the drill pipes.

Example

A positive-reversing drill rod of a tooth-clamping stop type, as shown in Figures 1 to 11, includes a female joint 1, a rod body 2, a male joint 3, a rectangular pin 4, a sliding sleeve 5, a transmission rod 6, a positioning member 7, The elastic member 8 and the clamping block 9, wherein the elastic member 8 is a spring.

The female joint 1 and the male joint 3 are respectively connected with the rod body 2 by means of coaxial friction welding to form the drill rod body. As shown in Figure 3.

(1) Female connector 1

The wall thickness of the front end of the female joint is adapted to the rod body 2 to ensure the proper wall thickness of the friction welded pipe. The middle section is provided with a sliding hole 103 matched with the transmission rod 6 , and two stepped limit holes 104 are symmetrically arranged on the hole wall of the sliding hole 103 for installing the positioning member 7 , the spring and the clamping block 9 . The rear section is the conical internal thread 102 (assuming the thread pitch is p) that is matched with the male joint 3 . From the rear end face of the female connector 1, the inner teeth 101 are provided axially forward. The groove width of the inner cog 101 is larger than the tooth width, the inner cog 101 is composed of a first long tooth 101a and several short teeth, the first long tooth 101a is h longer than the other short teeth, and h<p, preferably p-h= 2～4mm).

(2) Male connector 3

The wall thickness of the rear end of the male joint 3 is adapted to the rod body 2 to ensure the proper wall thickness of the friction welded pipe. The rear section of the outer cylindrical surface is provided with a shaft shoulder 307 facing forward to form an axial limit, so as to realize the axial limit of the sliding sleeve 5 . The middle section is provided with an external spline 305, which cooperates with the internal spline 502 of the sliding sleeve 5 to transmit the rotational torque of the drill rod. The front section of the male joint 3 is a conical external thread 302, and there is a stop shaft 301 in front of the external thread. Exit under effect. The male connector 3 is provided with a through hole 308, an insertion hole 304 and a water through hole 303 in sequence from the back to the front. The through hole 308 is used for passing the transmission rod 6, and the insertion hole 304 is used for installing the transmission rod 6 and slidingly connected with it. The hole 303 communicates with the through hole 308, the inner hole of the rod and the front and rear water holes of the transmission rod to form a slag discharge water channel. Two sliding grooves 306 are oppositely provided on the hole walls of the through hole 308 , which are strip-shaped grooves along the axial direction of the drill rod, and are slidably matched with the rectangular pins 4 .

(3) Sliding sleeve 5

The sliding sleeve 5 is made of high-strength seamless thick-walled steel pipe as a whole. The smooth inner holes at the front and rear ends are slidably matched with the corresponding shaft sections of the male joint 3 . The middle section is provided with an inner spline 502 which is matched with the outer spline 305 of the male connector 3 . The front end face is axially rearwardly provided with external teeth 501 matched with the internal teeth 101, and the external teeth 501 are composed of a second long tooth 501a and a plurality of short teeth.

(4) Transmission pin

The transmission pin is a rectangular pin 4 with a rectangular cross-section, and four edges along the length direction are chamfered. The sliding groove 306 of the male joint 3 is fixed in the middle in the rectangular hole of the transmission rod 6 , and the two ends are fixed in the fixing holes 503 of the sliding sleeve 5 . The rectangular pin 4 transmits the movement between the sliding sleeve 5 and the transmission rod 6 .

(5) A locking mechanism composed of a positioning member 7, a spring and a clamping block 9

The positioning member 7 is a stepped pin, including a large end 701 and a small end 702 arranged in sequence, the large end 701 is a limit shaft segment, the small end 702 is a guide shaft segment, and the bottom of the small end 702 is a hemispherical head-shaped positioning portion, It cooperates with the locking groove on the transmission rod 6 to limit the position of the transmission rod 6 . The end surface of the transition between the small end 702 and the big end 701 is matched with the stepped surface of the limiting hole 104 of the female joint 1 to prevent the positioning member 7 from falling into the interior of the drill pipe. The upper end face of the big end 701 is used to support the spring.

The structure of the clamping block 9 is similar to that of the positioning member 7. The bottom of the small end presses the spring to generate a pressing force directed towards the inside of the drill pipe, so that the positioning member 7 extends out of the limiting hole 104 of the female joint 1; Interference fit is adopted at the largest diameter, combined with spot welding to ensure firm installation.

The transmission rod 6 is a shaft structure as a whole, including a front section, a middle section and a rear section arranged in sequence. The front section is the front mounting section 601, which is inserted into the socket 304 of the male connector 3 and forms a moving pair; The front mounting section 601 is provided with a front water passage hole 602 , including a front axial water hole opened inward from the front end and a front radial water hole opened on the pipe wall of the front mounting section 601 . The rear water passage hole 604 is similar to the front water passage hole 602 . A front locking groove 605 and a rear locking groove 606 are provided on the outer cylindrical surface of the rear mounting section 603 , both of which are arc-shaped sectional grooves around the transmission rod 6 . The radial depth of the slot matches the hemispherical head of the small end 702 of the retainer 7 . In the stop working condition, the positioning member 7 is stuck in the rear locking groove 606 ; in the rotatable working condition, the positioning member 7 is stuck in the front locking groove 605 . The rectangular slot 607 is used to install the rectangular pin 4 .

The working principle of this embodiment is as follows:

(1) Stopping principle of drilling

1) Initial state: the front end drill pipe 10 is in a stop state, and the upper drill pipe 11 is in a rotatable state.

2) All the external threads of the male joint 3 of the upper drill rod 11 are screwed into the internal threads of the female joint 1 of the front drill rod 10. At this time, the second long tooth 501a of the sliding sleeve 5 of the upper drill rod 11 is drilled by the front end. The first long tooth 101a of the female connector 1 of the rod 10 is blocked, and the contact length of the two teeth is h, and it cannot rotate in the forward direction. Since the pitch p is greater than h, and the initial positions of the contact surfaces of the two long teeth are in the same plane in space, the contact of the two long teeth must occur after the last thread is tightened, see Figures 8 and 9 .

3) Push the sliding sleeve 5 to move forward so that all the claw teeth are engaged. The sliding sleeve 5 drives the transmission rod 6 to move forward through the transmission pin until all the claw teeth are engaged, and the positioning member 7 is inserted into the rear locking groove 606 . At this time, both forward and reverse rotations cannot be performed to achieve the purpose of stopping. At the same time, the front end surface of the stop shaft 301 of the male joint 3 of the upper drill rod 11 is pressed against the rear end of the transmission rod 6 of the front drill rod 10 to prevent it from loosening due to vibration during the drilling process, see Figure 10 and Figure 11 .

(2) Stopping principle of drilling down

1) Initial state: both the front-end drill rod 10 and the lower drill rod 12 are in a stop state in which all the claw teeth are engaged, see FIG. 10 and FIG. 11 .

2) Push the sliding sleeve 5 of the drill rod 12 backward until the positioning member 7 is inserted into the front locking groove 605 . At this time, only two long teeth are left in contact with each other, and the contact length is h, and the remaining teeth are all out of meshing, see Figure 8 and Figure 9.

3) The lower drill pipe 12 is reversed. Since h<p, after one turn of rotation, the two long teeth are no longer in contact, and the threads of the two drill pipes can be loosened normally.

The invention realizes the function that the forward and reverse bidirectional rotation threads of the threaded connection drill pipe do not trip; at the same time, the locking and loosening of the tooth cogs are realized by a simple sliding sleeve translation back and forth, which is helpful to realize the The automatic loading and unloading of the reverse drill pipe not only provides technical support for automatic drilling in coal mines, but also has good economic benefits.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be Modifications or equivalent replacements, without departing from the spirit and scope of the technical solution, should all be included in the scope of the claims of the present invention.

Claims

A positive-reversing drill rod of a tooth-clamping stop type is characterized in that it comprises a rod body, the front end of the rod body is provided with a male joint, and the rear end is provided with a female joint which can be threadedly connected with the male joint, and the rod body, the male joint and the female joint are all provided with a male joint. It is a hollow structure to form a central hole that penetrates through each other in the axial direction; the central hole is provided with a transmission rod that is slidably connected with it, and the front end of the transmission rod is provided with a sliding groove that passes through the male joint and a sliding groove that is sleeved on the male joint. A transmission pin connected by a sleeve; the front end of the sliding sleeve has a plurality of teeth cogs that can cooperate with the rear end of the female joint for circumferential locking, including a long tooth and a plurality of short teeth, and the meshing length of the long teeth is longer than the meshing length of the short teeth The length h, h is less than the pitch p of the male joint and the female joint; when the sliding sleeve is located at the axial limit set on the male joint, the two adjacent drill rods can be tightened and only a pair of long teeth are in contact, and the contact length is h1, 0<h1≤h; the sliding sleeve can move from the axial limit to the front end of the male joint along the axial direction of the male joint to make the teeth of the two adjacent drill rods fully meshed with the teeth.
The claw-stop type forward-reversing drill pipe according to claim 1, wherein the rear end face of the female joint is provided with inner claw forwardly in the axial direction, and the inner claw includes a first long teeth and a plurality of short teeth; the front end surface of the sliding sleeve is provided with external tooth cogs rearward in the axial direction, and the external teeth cogs include second long teeth and several short teeth.
The tooth-clamping type forward-reversing drill rod according to claim 1, further comprising a locking mechanism capable of locking the transmission rod in a state of full-tooth engagement and only long-tooth contact.
The tooth-clamping type forward-reversing drill rod according to claim 3, wherein the locking mechanism is an elastic telescopic mechanism located in the limit hole opened on the female joint, including The positioning part is opened in the locking groove at the rear end of the transmission rod. When the locking mechanism corresponds to the position of the locking groove, the positioning part of the locking mechanism can extend into the locking groove to realize the axis of the transmission rod relative to the female joint. The locking groove includes a front locking groove and a rear locking groove axially arranged along the transmission rod. When the sliding sleeve is at the position of the axial limit, the locking mechanism corresponds to the position of the front locking groove. The position of the locking mechanism corresponds to the position of the rear locking groove when the sleeve is fully engaged with the male joint.
The tooth-clamping type forward-reversing drill rod according to claim 4, wherein the front locking groove and the rear locking groove are arc-shaped cross-section grooves around the transmission rod.
A positive-reversing drill rod of a tooth-clamping type according to claim 4, wherein the locking mechanism comprises a clamping block, an elastic member and a positioning member, and the positioning member is slidably connected to the limiting hole near the central hole One end of the clamp block is fixed at the end of the limiting hole away from the central hole, and the elastic piece is located between the clamp block and the positioning piece.
The tooth claw stop type forward and reverse drill pipe according to claim 6, wherein the limit hole is a stepped hole, and the diameter of the limit hole increases sequentially from the inside to the outside along the radial direction of the female joint, including The female joint is radially arranged from the inside to the outside and has a guide section, a limit section and a fixed section with increasing diameters, a clamping block is fixed in the fixed section, and a positioning piece is slidably connected in the guide section; the positioning piece is a stepped shaft, including the guide section and the guide section. The sliding-fit guide shaft segment, one end of the guide shaft segment close to the central hole has a positioning part, and the other end is provided with a limit shaft segment, the limit shaft segment is located in the limit segment of the limit hole, and the shaft diameter of the limit shaft segment is larger than The diameter of the guide section of the limit hole.
The tooth claw stop type forward and reverse drill rod according to claim 1, wherein when two adjacent drill rods are screwed tightly, the front end face of the male joint is in contact with the transmission rod of the other drill rod.
A positive-reversing drill rod of the tooth blocking type according to claim 1, wherein the male joint comprises a jacking section, a threaded section and a connecting section arranged in sequence, wherein the connecting section is fixed to the rod body Connection, the circumferential direction of the connecting section is provided with an external spline matching the internal spline set on the sliding sleeve, and the circumferential direction of the threaded section is provided with an external thread matching the internal thread set on the female joint. When tightening, the front end face of the jacking section is in contact with the rear end face of the transmission rod of the other drill rod.
The tooth-clamping type forward-reversing drill rod according to claim 1, characterized in that: the transmission rod comprises a front section, a middle section and a rear section arranged in sequence; The front water hole includes a front axial water hole opened inward from the front end of the front section and a front radial water hole communicated with the front axial water hole and arranged radially along the front section; the rear section is provided with a rear channel The water hole includes a rear axial water hole opened inward from the rear end of the rear section and a rear radial water hole communicated with the rear axial water hole and arranged radially along the rear section.