Double-section type drill bit for coal rock sample preparation

Abstract

The utility model discloses a coal rock sample preparation double-section type drill bit which comprises a split cylindrical drill bit rear section and a drill bit front section, a drilling machine connecting part is arranged at the tail end of the drill bit rear section, a zigzag drilling part is arranged at the front end of the drill bit front section, the front end of the drill bit rear section is connected with the drill bit front section in an inserted mode, and the drill bit rear section is connected with the drill bit front section in an inserted mode. The inner side face and the outer side face of the drill bit rear section and the inner side face and the outer side face of the drill bit front section are coplanar, the two inserted ends of the drill bit rear section and the drill bit front section are a socket end and a spigot end respectively, the outer wall of the socket end and the outer side face of the drill bit are coplanar, and the inner wall of the socket end deviates in the direction away from the center in the circumferential direction to form a socket. The outer wall of the socket end is circumferentially deviated towards the center to form a plug, a stop block is arranged on the outer wall of the socket end in a protruding mode, and a stop groove allowing the stop block to be axially guided into the socket and limiting axial sliding of the socket end is formed in the inner wall of the socket end. Two sections of the drill bit are meshed to form a whole, the drill bit can reversely rotate to release meshing after drilling a coal pillar, and the drill bit is divided into two sections to obtain a complete coal pillar.

Description

TECHNICAL FIELD

[0001] The utility model relates to coal rock sample preparation drill string technical field, concretely relates to a coal rock sample preparation double-section drill head. BACKGROUND

[0002] Coal rock nuclear magnetic resonance and reservoir damage analysis is the extremely key experimental link in coal quality detection, wherein, the core of coal rock experiment lies in the preparation of coal column. In the process of drilling coal column, the primary task is to ensure that the coal column can be smoothly drilled to the required length, and then the drill head can be removed, and the coal column is taken out from the drill head. If the coal column cannot reach the specified complete size, it will not accurately represent the characteristics of the coal sample, and thus the whole experiment cannot be smoothly carried out.

[0003] When drilling the coal column, it is necessary to ensure that the complete coal column is accurately taken out at a fixed height. However, since the drill head used for drilling the coal column is a hollow tubular whole structure, the coal column will be completely clamped in the cavity of the drill head after drilling. In the process of trying to take out the coal column, due to the lack of effective force point, it may cause unpredictable damage to the integrity of the coal column. SUMMARY

[0004] The utility model discloses to solve the problem that the whole cavity drill head can contain the coal column completely, and the coal column is clamped in the drill head during the drilling process, resulting in the problem of being unable to take out, and provides a coal rock sample preparation double-section drill head.

[0005] The utility model discloses the technical scheme is: a coal rock sample preparation double-section drill head, including the split type's cylindrical drill head rear section and drill head front section, the tail end of drill head rear section is provided with the drill rig connecting portion, the front end of drill head front section is equipped with the sawtooth shape's drilling part, the front end of drill head rear section is connected with the rear end of drill head front section and is inserted, the drill head inner side of drill head rear section and drill head front section and drill head outer side are all coplanar, and the both ends of insertion are socket end and spigot end respectively, the outer wall of socket end is coplanar with drill head outer side, and the inner wall is circumferentially offset to form socket end and form the plug of the outer wall circumferentially offset to the center direction, the inner wall of spigot end is coplanar with drill head inner side, and the outer wall circumferentially offset to form the plug, and the outer wall of spigot end is projected and is equipped with the stopper, and the inner wall of socket end is equipped with the stop groove for the axial introduction of stopper and the restriction of spigot end axial sliding.

[0006] Further, the stop groove is an internal thread, and the rotation direction of the internal thread is the same as the rotation direction of the drill.

[0007] Further, the shape of the stop groove corresponds to the shape of the stopper, the stopper is contained in the stop groove to limit the axial sliding of the spigot end, and the side of the stop groove away from the rotation direction of the drill is provided with a guide groove for the axial introduction of the stopper into the socket.

[0008] Further, the stopper is long strip-shaped and is vertically spaced.

[0009] Further, the stop block is circumferentially provided with a plurality of.

[0010] Compared with the prior art, the utility model has the beneficial effects as follows:

[0011] The utility model discloses the design is through the drill bit is divided into two parts of cooperation and is connected, make after the coal pillar is drilled successfully, can expose part coal pillar through separating drill bit to take out coal pillar conveniently and completely. This method has reduced the broken rate of coal pillar significantly, has guaranteed the integrity of coal pillar. BRIEF DESCRIPTION OF DRAWINGS

[0012] Fig. 1 It is the exploded view of the utility model;

[0013] Fig. 2 It is the front view of the utility model;

[0014] Fig. 3 It is the plan view of the utility model.

[0015] In the drawing: 1, drill bit rear section;11, drilling machine connecting portion;2, drill bit front section;21, drill in portion;3, socket end;31, stop groove;32, lead-in groove;4, spigot end;41, stop block. DETAILED DESCRIPTION

[0016] In order to better understand the purpose, structure and function of the utility model, the following will be further described in detail in combination with the drawings to the coal rock sample preparation double-section drill bit of the utility model.

[0017] As Figs. 1-3 The utility model discloses a coal rock sample preparation double-section drill bit, including the split type's cylindrical drill bit rear section 1 and drill bit front section 2, the tail end of drill bit rear section 1 is provided with drilling machine connecting portion 11, the front end of drill bit front section 2 is equipped with the sawtooth shape's drill in portion 21, the front end of drill bit rear section 1 is connected with the rear end of drill bit front section 2, and the drill bit inner side surface and the drill bit outer side surface of drill bit rear section 1 and drill bit front section 2 are coplanar, and the two insertion interfaces are socket end 3 and spigot end 4 respectively, the outer wall of socket end 3 is coplanar with the drill bit outer side surface, the inner wall is circumferentially offset to form a socket away from the center direction, the inner wall of spigot end 4 is coplanar with the drill bit inner side surface, and the outer wall is circumferentially offset to form a plug to the center direction, and the outer wall of spigot end 4 is provided with stop block 41, and the inner wall of socket end 3 is provided with stop groove 31 for the axial lead-in socket of stop block 41 and the axial sliding of spigot end 4 is limited. The utility model discloses the single-section drill bit is changed into meshing double-section drill bit, and after drilling coal pillar, it can be smoothly taken out.

[0018] In the embodiment, the stop block 41 is long strip shape, two are vertically spaced, and four groups are circumferentially equiangular. The stop groove 31 corresponds to the shape of the stop block 41, the stop block 41 is contained in the stop groove 31 to limit the axial sliding of the socket end, and the side of the stop groove 31 away from the rotation direction of the drill bit drilling is provided with the guide groove 32 for the axial introduction of the stop block 41 into the socket. The stop block 41 is inserted into the socket through the guide groove 32 and can be twisted to be connected into the stop groove 31.

[0019] In the optional embodiment, the stop groove 31 is an internal thread, and the rotation direction of the internal thread is the same as the rotation direction of the drill bit drilling. The stop block 41 can be screwed into the stop groove 31 to be inserted into the socket.

[0020] Before drilling the coal pillar, the guide groove 32 of the socket end 3 and the stop block 41 of the socket end 4 are aligned, and the socket end 4 is inserted into the socket by pressing the two ends together, and then a drill bit is twisted to make the stop block 41 engage with the stop groove 31, and finally the drill rig connection part 11 is connected to the drill rig to start drilling the column. After the drilling is completed, the drill bit is twisted in the opposite direction to make the stop block 41 enter the guide groove 32 to open the engagement, and the two end drill bit sections are pulled apart, and a part of the coal pillar is located in the rear drill bit section 1 or the front drill bit section 2, and the exposed coal pillar can be removed by applying external force.

[0021] The two sections of the drill bit are engaged to form a whole, and after drilling the coal pillar, the engagement can be disengaged by reversing rotation, and the two sections can be separated to obtain a complete coal pillar.

[0022] It can be understood that the utility model is described through some embodiments, and those skilled in the art know that various changes or equivalent replacements can be made to these features and embodiments without departing from the spirit and scope of the utility model. In addition, under the guidance of the utility model, these features and embodiments can be modified to adapt to specific conditions and materials without departing from the spirit and scope of the utility model. Therefore, the utility model is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of the present application belong to the scope protected by the utility model.

Claims

1. A coal rock sampling double-section drill bit, characterized in that, The application relates to a drill bit rear section (1) and a drill bit front section (2) which are separate, the tail end of the drill bit rear section (1) is provided with a drilling rig connecting part (11), the front end of the drill bit front section (2) is provided with a sawtooth-shaped drilling part (21), the front end of the drill bit rear section (1) is connected with the rear end of the drill bit front section (2) in a plug-in mode, the inner side and the outer side of the drill bit rear section (1) and the drill bit front section (2) are coplanar, the two plug-in ends are a socket end (3) and a plug end (4) respectively, the outer wall of the socket end (3) is coplanar with the outer side of the drill bit, the inner wall is offset in a direction away from the center to form a socket, the inner wall of the plug end (4) is coplanar with the inner side of the drill bit, and the outer wall is offset in a direction towards the center to form a plug, a stop block (41) is protruded on the outer wall of the plug end (4), and a stop groove (31) is arranged on the inner wall of the socket end (3) and used for axially guiding the stop block into the socket and limiting the axial sliding of the plug end (4).

2. The coal rock sample preparation double-section drill bit according to claim 1, characterized in that, The stop groove (31) is internally threaded, and the rotation direction of the internal thread is the same as the rotation direction of the drill bit.

3. The coal rock sample preparation double-section drill bit according to claim 1, characterized in that, The stop groove (31) corresponds to the shape of the stop block (41), the stop block (41) is accommodated in the stop groove (31) to limit the axial sliding of the plug end (4), and the side of the stop groove (31) away from the rotation direction of the drill bit is provided with a guide groove (32) for axially guiding the stop block (41) into the socket.

4. The coal rock sample preparation double-section drill bit according to claim 3, characterized in that, The stop block (41) is long-strip-shaped and vertically spaced.

5. The coal or rock sample preparation double-section drill bit according to claim 3 or 4, characterized in that, The stop block (41) is circumferentially provided with a plurality of stop blocks.

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