CN217872677U

CN217872677U - Down-the-hole drill bit

Info

Publication number: CN217872677U
Application number: CN202221432590.1U
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, including down-the-hole drill bit body, rotating tube and heel tube, the heel tube passes through coupling mechanism and is connected with the rotating tube rotation, and the rotating tube can be dismantled coupling assembling and supply the actuating key to insert the keyway of establishing including setting up the actuating key on the rotating tube and setting up on the down-the-hole drill bit body with this body coupling of detachable mode and down-the-hole drill bit through dismantling coupling assembling, be equipped with on the down-the-hole drill bit body with the axial of keyway intercommunication leads to the groove. The down-the-hole drill bit has the advantages of reducing abrasion, being good in reliability and the like.

Description

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.

Background

At present, the pore-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 pore-forming technology is used in a plurality of cast-in-situ bored pile engineering.

In the prior art, a follow pipe is usually sleeved on a down-the-hole drill, a flange is convexly arranged on the outer circumferential wall of the down-the-hole drill, a step is convexly arranged on the inner side wall of the follow pipe, and the flange of the down-the-hole drill abuts against the step of the follow pipe to drive the follow 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 of prior art existence, provide a reducible wearing and tearing, good reliability's down-the-hole drill bit.

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, includes down-the-hole drill bit body, rotating tube and heel pipe, the heel pipe pass through coupling mechanism with the rotating tube rotates to be connected, the rotating tube through can dismantle coupling assembling with detachable mode with this body coupling of down-the-hole drill bit, can dismantle coupling assembling is including setting up driving key and setting on the rotating tube are in supply on the down-the-hole drill bit body the driving key inserts the keyway of establishing, be equipped with on the down-the-hole drill bit body with the axial that the keyway communicates leads to the groove.

Foretell down-the-hole drill bit, it is preferred, the keyway has the edge first horizontal location face, the horizontal location face of second and the vertical location face of connecting first horizontal location face and the horizontal location face of second that the axial interval of down-the-hole drill bit body set up, first horizontal location face and the horizontal location face of second are used for the butt respectively the both ends of drive key are in order to right the drive key is fixed a position, vertical location face is used for the butt one side of drive key is in order to right the drive key is fixed a position, be equipped with the passageway that supplies the drive key to get into the keyway on the down-the-hole drill bit body, the keyway with the passageway intercommunication.

An axial through slot.

In the down-the-hole drill bit, preferably, the depth of the key groove is smaller than that of the axial through groove.

In the down-the-hole drill bit, preferably, the axial through groove is provided with an auxiliary exhaust hole communicated with the exhaust channel of the down-the-hole drill bit body.

Preferably, the down-the-hole drill bit body is provided with an insert hole for mounting the protection teeth on the outer circumferential side wall of the end portion of the down-the-hole drill bit body.

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

the utility model discloses a down-the-hole drill bit, down-the-hole drill bit body pass through the rotating tube and are connected with the heel tube for the down-the-hole drill bit body can drive the heel tube and avoid when creeping into the direction motion with heel tube direct contact, can avoid the heel tube to produce axial pressure to the down-the-hole drill bit body, and can avoid the down-the-hole drill bit body to rotate with the heel tube relatively and produce the friction, reduce down-the-hole drill bit body wearing and tearing, extension down-the-hole drill bit life improves the reliability of down-the-hole drill bit. The rotating pipe is connected with the down-the-hole drill body in a detachable mode, the rotating pipe is convenient to replace, and the rotating pipe can be repeatedly used and is beneficial to saving materials. The detachable connecting assembly is reliable in connection.

Drawings

FIG. 1 is a schematic perspective view of a down-the-hole drill bit.

FIG. 2 is a schematic perspective view of a down-the-hole bit body.

Fig. 3 is a perspective view of the rotating tube (with the tube attached thereto).

Illustration of the drawings:

1. a down-the-hole drill bit body; 11. an axial through slot; 12. a transverse slag discharge groove; 2. rotating the tube; 3. pipe following; 4. a drive key; 5. a keyway; 51. a first lateral positioning surface; 52. a second transverse positioning surface; 53. a longitudinal positioning surface; 6. an auxiliary exhaust hole; 7. inlaying a hole; 8. and a main exhaust hole.

Detailed Description

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

As shown in fig. 1 to 3, the down-the-hole drill bit of this embodiment, including down-the-hole drill bit body 1, rotating tube 2 and heel tube 3, heel tube 3 passes through coupling mechanism and is connected with rotating tube 2 rotation, rotating tube 2 is connected with detachable mode and down-the-hole drill bit body 1 through dismantling coupling assembling, can dismantle coupling assembling and include a plurality of setting drive key 4 and a plurality of setting on rotating tube 2 and supply drive key 4 to insert the keyway 5 of establishing on down-the-hole drill bit body 1, be equipped with the axial that communicates with keyway 5 on the down-the-hole drill bit body 1 and lead to groove 11. The driving keys 4 on the rotating pipe 2 correspond to the key slots 5 on the down-the-hole drill bit body 1 one by one. When installed, the drive key 4 enters the keyway 5 from the axial through slot 11. Coupling mechanism is including setting up recess on the 2 outer walls of rotating-tube and the arch of setting on 3 inner walls of heel tube, and the recess of rotating-tube 2 extends along circumference, and the arch on the heel tube 3 is inserted and is established in the recess on rotating-tube 2 for heel tube 3 can rotate and can be at the drive of rotating-tube 2 to axial motion for rotating-tube 2. The down-the-hole drill bit body 1 is connected with the heel tube 3 through the rotating tube 2, so that the down-the-hole drill bit body 1 can drive the heel tube 3 to move towards the drilling direction and simultaneously avoid direct contact with the heel tube 3, the heel tube 3 can be prevented from generating axial pressure on the down-the-hole drill bit body 1, friction caused by relative rotation of the down-the-hole drill bit body 1 and the heel tube 3 can be avoided, abrasion of the down-the-hole drill bit body 1 is reduced, the service life of the down-the-hole drill bit is prolonged, and the reliability of the down-the-hole drill bit is improved. The rotating pipe 2 is connected with the down-the-hole drill bit body 1 in a detachable mode, the rotating pipe 2 is convenient to replace, and the rotating pipe 2 can be repeatedly used and is beneficial to saving materials. The detachable connecting component is reliable in connection. The utility model discloses an applicable big moment of torsion of down-the-hole drill bit, big vibrating force mechanical equipment and adverse circumstances construction.

In this embodiment, the key groove 5 has a first transverse positioning surface 51, a second transverse positioning surface 52 and a longitudinal positioning surface 53 connecting the first transverse positioning surface 51 and the second transverse positioning surface 52, which are arranged at intervals in the axial direction of the down-the-hole drill bit body 1, the first transverse positioning surface 51 and the second transverse positioning surface 52 are used for respectively abutting against two ends of the driving key 4 to position the driving key 4, and the longitudinal positioning surface 53 is used for abutting against one side of the driving key 4 to position the driving key 4. The first transverse positioning surface 51 and the second transverse positioning surface 52 are abutted against two ends of the driving key 4, so that the driving key 4 can be prevented from moving in the axial direction of the down-the-hole drill bit body 1; the longitudinal locating surface 53 abuts one side of the drive key 4 so that the down-the-hole drill bit body 1 can drive the rotary pipe 2 to rotate. When the rotating tube 2 is installed, the drive key 4 is passed from the passage into the key slot 5. The driving key 4 is reliably connected with the key groove 5, the stability is good, and the dismounting is convenient.

In this embodiment, the down-the-hole drill bit body 1 is provided with a transverse slag discharge groove 12 communicated with the axial through groove 11, and the transverse slag discharge groove 12 is provided with a main exhaust hole 8.

In this embodiment, the depth of the key groove 5 is smaller than the depth of the axial through groove 11.

In this embodiment, the axial through groove 11 is provided with an auxiliary exhaust hole 6 communicated with an exhaust passage of the down-the-hole drill body 1. Improve the slag discharging effect.

In this embodiment, the outer circumferential side wall of the end of the down-the-hole drill body 1 is provided with an insert hole 7 for mounting a protective tooth. The protective teeth are arranged on the inlaid holes 7, the hole diameter of the formed hole can be increased during drilling, friction between the rock wall and the rotating pipe 2 can be reduced, the rotating pipe 2 is protected, and the service life of the rotating pipe 2 is prolonged.

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. For those skilled in the art, the modifications and changes obtained without departing from the technical idea of the present invention shall be considered as the protection scope of the present invention.

Claims

1. A down-the-hole drill bit, comprising: including down-the-hole drill bit body (1), rotating tube (2) and heel tube (3), heel tube (3) through coupling mechanism with rotating tube (2) rotate and connect, rotating tube (2) through can dismantle coupling assembling with detachable mode with down-the-hole drill bit body (1) is connected, can dismantle coupling assembling including setting up driving key (4) and setting on rotating tube (2) are in supply on down-the-hole drill bit body (1) driving key (4) insert keyway (5) of establishing, be equipped with on down-the-hole drill bit body (1) with the axial that keyway (5) communicate leads to groove (11).

2. The down-the-hole drill bit of claim 1, wherein: keyway (5) have along first horizontal locating surface (51), the horizontal locating surface of second (52) and the vertical locating surface (53) of connecting first horizontal locating surface (51) and the horizontal locating surface of second (52) that the axial interval of down-the-hole drill bit body (1) set up, first horizontal locating surface (51) and the horizontal locating surface of second (52) are used for the butt respectively the both ends of drive key (4) are in order to right drive key (4) advance line location, vertical locating surface (53) are used for the butt one side of drive key (4) is in order to right drive key (4) advance line location.

3. The down-the-hole drill bit of claim 2, wherein: the depth of the key groove (5) is smaller than that of the axial through groove (11).

4. The down-the-hole drill bit of claim 2, wherein: and the axial through groove (11) is provided with an auxiliary exhaust hole (6) communicated with an exhaust channel of the down-the-hole drill bit body (1).

5. The down-the-hole drill bit of any one of claims 1 to 4, wherein: and the outer circumferential side wall of the end part of the down-the-hole drill bit body (1) is provided with an inlaying hole (7) for mounting a protection tooth.