CN217872668U

CN217872668U - Pipe following structure of down-the-hole drill bit

Info

Publication number: CN217872668U
Application number: CN202221432758.9U
Authority: CN
Inventors: 万达
Original assignee: Hunan Xinyanggang Construction Machinery Co ltd
Current assignee: Hunan Xinyanggang Construction Machinery Co ltd
Priority date: 2022-06-09
Filing date: 2022-06-09
Publication date: 2022-11-22
Anticipated expiration: 2032-06-09

Abstract

The utility model discloses a down-the-hole drill bit follow pipe structure, establish connecting pipe and cover on the down-the-hole drill bit and establish the pipe body that follows on the connecting pipe including the cover, follow the pipe body and be connected with connecting pipe pivoted mode and connecting pipe through rotating coupling mechanism with connecting pipe pivoted relatively. The pipe following structure of the down-the-hole drill bit has the advantages of reducing abrasion, being good in reliability and the like.

Description

Pipe following structure of down-the-hole drill bit

Technical Field

The utility model relates to a drill bit technical field, concretely relates to down-the-hole drill bit follow pipe structure.

Background

At present, the hole-forming technology of down-the-hole pipe-following drilling is widely applied to the cast-in-situ bored pile engineering, and the large-aperture down-the-hole hammer pipe-following drilling technology is also widely applied, for example, the large-aperture down-the-hole drill bit full-casing pipe-following drilling hole-forming technology is used in a plurality of cast-in-situ bored pile engineering.

In the prior art, the casing pipe is usually sleeved on a down-the-hole drill bit, the outer circumferential wall of the down-the-hole drill bit is convexly provided with a flange, the inner side wall of the casing pipe is convexly provided with steps, and the flange of the down-the-hole drill bit is abutted against the steps of the casing pipe and can drive the casing pipe to move towards the hole depth direction. When the down-the-hole drill bit is in drilling construction, the contact part of the flange of the down-the-hole drill bit and the step of the pipe-following bears larger axial pressure, and the flange of the down-the-hole drill bit and the step of the pipe-following are mutually rotated to generate friction, so that the down-the-hole drill bit is easily abraded, and the pipe-following effect is influenced.

In view of the above-mentioned wear phenomena, it is necessary for the constructor to repair the worn portion of the down-the-hole drill according to general experience. However, the repair welding method has unsatisfactory effect, and the repair welding of the down-the-hole drill bit in large area wastes time and labor, and has low construction efficiency and high labor intensity.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is to overcome the not enough that prior art exists, provide a reducible wearing and tearing, good reliability's down-the-hole drill's following tube structure.

In order to solve the technical problem, the utility model discloses a following technical scheme:

the utility model provides a down-the-hole drill bit follow tubular construction, establishes including the cover connecting pipe and the cover on the down-the-hole drill bit with establish follow pipe body on the connecting pipe, follow pipe body through rotate coupling mechanism with connecting pipe pivoted mode relatively with the connecting pipe is connected.

Foretell follow pipe structure, it is preferred, it includes that a plurality of settings are in to rotate coupling mechanism annular groove and a plurality of setting on the pipe body inside wall of following are in annular boss on the connecting pipe lateral wall, it is a plurality of annular groove sets up along the axial interval of following the pipe body, and is a plurality of annular boss follows the axial interval of connecting pipe sets up and with the annular groove one-to-one, annular boss inserts and establishes and corresponds just can rotate relatively in the annular groove.

In the pipe following structure, preferably, the connecting pipe comprises a straight cylinder section and an alloy expanding section which are connected with each other, the outer diameter of the expanding section is gradually increased in a direction away from the straight cylinder section, and the pipe following body is sleeved on the straight cylinder section.

In the pipe-following structure, preferably, the end of the free end of the expanding section is provided with a plurality of first insert holes for installing the drill teeth.

In the pipe following structure, preferably, one end of the expanding section, which is far away from the straight cylinder section, is provided with a first conical surface and a second conical surface, the diameter of the first conical surface is gradually increased from the inner side wall to the outer side wall of the connecting pipe, the diameter of the second conical surface is gradually decreased from the inner side wall to the outer side wall of the connecting pipe, and the first embedding hole is formed in each of the first conical surface and the second conical surface.

In the pipe following structure, preferably, a step is arranged at one end of the pipe following body, which is far away from the expanding section.

The pipe-following structure is preferred, and the connecting pipe is provided with a positioning part for abutting against one end of the pipe-following body so as to position the pipe-following body.

Compared with the prior art, the utility model has the advantages of:

the utility model discloses a down-the-hole drill bit's with pipe structure, during drilling construction, the down-the-hole drill bit drives the connecting pipe and rotates, can rotate for the connecting pipe with the pipe body, does not take place to rotate with the pipe body, follows the down-the-hole drill bit under the drive of connecting pipe with the pipe body and moves to the direction of driling. The pipe-following body is connected with the down-the-hole drill bit through the connecting pipe, so that the axial pressure of the pipe-following body on the down-the-hole drill bit can be avoided, the friction caused by the relative rotation of the down-the-hole drill bit and the pipe-following body can be avoided, the abrasion of the down-the-hole drill bit is reduced, the service life of the down-the-hole drill bit is prolonged, the cost is reduced, and the reliability of the down-the-hole drill bit is improved. The down-the-hole drill bit body is less worn, and the repair welding process can be reduced, so that the labor intensity is reduced, and the construction efficiency is improved. The utility model discloses an applicable big moment of torsion of heel pipe, big vibrating force mechanical equipment and adverse circumstances construction.

Drawings

Fig. 1 is a schematic perspective view of a casing structure of a down-the-hole drill bit.

Fig. 2 is a front view of the casing structure of the down-the-hole drill.

Fig. 3 is a schematic cross-sectional view of a casing structure of a down-the-hole drill bit.

Illustration of the drawings:

1. a pipe-following body; 11. an annular groove; 12. a step; 2. a connecting pipe; 21. an annular boss; 22. a positioning part; 23. a diameter expanding section; 231. a first inlay hole; 232. a first conical surface; 233. a second tapered surface.

Detailed Description

The present invention will be described in further detail with reference to the following drawings and specific embodiments.

As shown in fig. 1 to fig. 3, the pipe following structure of the down-the-hole drill bit of the present embodiment includes a connecting pipe 2 sleeved on the down-the-hole drill bit and a pipe following body 1 sleeved on the connecting pipe 2, and the pipe following body 1 is connected with the connecting pipe 2 in a manner of being capable of rotating relative to the connecting pipe 2 by rotating the connecting mechanism. During drilling construction, the down-the-hole drill bit drives the connecting pipe 2 to rotate, the follow pipe body 1 can rotate relative to the connecting pipe 2, the follow pipe body 1 does not rotate, and the follow pipe body 1 moves towards the drilling direction along with the down-the-hole drill bit under the driving of the connecting pipe 2. The pipe-following body 1 is connected with the down-the-hole drill through the connecting pipe 2, so that the axial pressure of the pipe-following body 1 on the down-the-hole drill can be avoided, the friction caused by the relative rotation of the down-the-hole drill and the pipe-following body 1 can be avoided, the abrasion of the down-the-hole drill is reduced, the service life of the down-the-hole drill is prolonged, the cost is reduced, and the reliability of the down-the-hole drill is improved. The down-the-hole drill bit body is less worn, and the repair welding process can be reduced, so that the labor intensity is reduced, and the construction efficiency is improved. The utility model discloses an applicable big moment of torsion of heel pipe, big vibrational force mechanical equipment and adverse circumstances construction.

In this embodiment, rotate coupling mechanism and include a plurality of annular grooves 11 and a plurality of annular boss 21 of setting on the 2 lateral walls of connecting pipe of a plurality of settings on the 1 inside wall of following pipe body, a plurality of annular grooves 11 set up along the axial interval of following pipe body 1, a plurality of annular boss 21 along the axial interval setting of connecting pipe 2 and with annular groove 11 one-to-one, annular boss 21 inserts and establishes in the annular groove 11 that corresponds and can rotate relatively. A plurality of annular boss 21 and a plurality of annular groove 11 interlock each other, annular boss 21 can promote with pipe body 1 to the motion of drilling direction, and pipe body 1 has a plurality of annular groove 11 that can bear the thrust of annular boss 21, and the lifting surface area is big, can strengthen the reliability that pipe body 1 is connected with connecting pipe 2.

In this embodiment, the connecting pipe 2 comprises a straight cylinder section and an alloy expanding section 23 which are connected with each other, the outer diameter of the expanding section 23 gradually increases in the direction away from the straight cylinder section, and the following pipe body 1 is sleeved on the straight cylinder section. The expanded diameter section 23 can be reamed outward to protect the connection tube 2.

In this embodiment, the end of the free end of the expanding section 23 is provided with a plurality of first insert holes 231 for mounting the drill teeth.

In this embodiment, one end of the expanding section 23 away from the straight tube section has a first tapered surface 232 and a second tapered surface 233, the diameter of the first tapered surface 232 gradually increases from the inner side wall to the outer side wall of the connection tube 2, the diameter of the second tapered surface 233 gradually decreases from the inner side wall to the outer side wall of the connection tube 2, and the first tapered surface 232 and the second tapered surface 233 are both provided with first embedding holes 231. The area of the end part of the free end of the expanding section 23 can be increased, so that the number of the drilling teeth on the section of the expanding section 23 can be increased, and the expanding efficiency can be improved.

In this embodiment, a step 12 is provided at one end of the pipe-following body 1 far away from the diameter-expanding section 23.

In this embodiment, the connecting pipe 2 is provided with the positioning portion 22 for positioning the following pipe body 1 by abutting one end of the following pipe body 1. When the following pipe body 1 is installed, the following pipe body 1 is processed through the positioning portion 22, operation is convenient, and installation accuracy can be improved.

The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above-mentioned embodiments. To those skilled in the art, the modifications and changes that can be made without departing from the scope of the present invention shall be considered as the protection scope of the present invention.

Claims

1. The utility model provides a pipe following structure of down-the-hole drill bit which characterized in that: establish connecting pipe (2) and cover on the down-the-hole drill bit including the cover establish with the cover and establish with pipe body (1) on connecting pipe (2), with pipe body (1) through rotate coupling mechanism with connecting pipe (2) pivoted mode relatively with connecting pipe (2) are connected.

2. The casing structure of a down-the-hole drill bit as claimed in claim 1, wherein: rotate coupling mechanism and include that a plurality of settings are in annular groove (11) and a plurality of setting on following pipe body (1) inside wall are in annular boss (21) on connecting pipe (2) lateral wall, it is a plurality of annular groove (11) set up along the axial interval with pipe body (1), and are a plurality of annular boss (21) are followed the axial interval of connecting pipe (2) set up and with annular groove (11) one-to-one, annular boss (21) are inserted and are established and are corresponded just can rotate relatively in annular groove (11).

3. The casing structure of a down-the-hole drill bit as claimed in claim 1, wherein: the connecting pipe (2) comprises a straight cylinder section and an alloy expanding section (23) which are connected with each other, the outer diameter of the expanding section (23) is gradually increased in the direction far away from the straight cylinder section, and the pipe following body (1) is sleeved on the straight cylinder section.

4. The casing structure of a down-the-hole drill bit as claimed in claim 3, wherein: the end part of the free end of the expanding section (23) is provided with a plurality of first mounting holes (231) for mounting the drilling teeth.

5. The casing structure of a down-the-hole drill bit as claimed in claim 4, wherein: one end, far away from the straight cylinder section, of the expanding section (23) is provided with a first conical surface (232) and a second conical surface (233), the diameter of the first conical surface (232) is gradually increased from the inner side wall to the outer side wall of the connecting pipe (2), the diameter of the second conical surface (233) is gradually decreased from the inner side wall to the outer side wall of the connecting pipe (2), and the first embedding hole (231) is formed in each of the first conical surface (232) and the second conical surface (233).

6. The casing structure of a down-the-hole drill bit as claimed in claim 3, wherein: and a step (12) is arranged at one end of the pipe following body (1) far away from the diameter expanding section (23).

7. The casing structure of a down-the-hole drill bit according to any one of claims 1 to 6, wherein: the connecting pipe (2) is provided with a positioning part (22) which is used for abutting against one end of the pipe following body (1) so as to position the pipe following body (1).