CN116971728A - Coal mine reaming device - Google Patents

Abstract

The application provides a coal mine reaming device, which comprises: the drill rod body is rotatably arranged; the hole-enlarging structure comprises a hole-enlarging drill rod and a hole-enlarging drill bit arranged on the hole-enlarging drill rod, wherein the diameter of the hole-enlarging drill bit is directly larger than that of the hole-enlarging drill rod and that of the drill rod body, the hole-enlarging drill rod is arranged at one end of the drill rod body, the drill rod body drives the hole-enlarging drill rod to rotate, and the hole-enlarging drill bit is used for enlarging a coal mine via hole; the first water hole drill rods are arranged on the drill rod body at intervals and are used for flushing and discharging rock scraps generated after reaming of the reaming bit. According to the technical scheme provided by the application, the problem that rock scraps cannot be removed in time when a coal mine reaming device in the prior art reams holes can be solved.

Description

Coal mine reaming device

Technical Field

The application relates to the technical field of drilling engineering in coal mine areas, in particular to a coal mine reaming device.

Background

Nowadays, with the continuous expansion of the transverse mining area of the coal mine and the continuous increase of the mining depth in the longitudinal direction, the workload of water supply and drainage, gas pumping and drainage, ventilation, material supply and the like among different levels and different trays in the coal mine are gradually increased. Only by using the traditional well tunnel as a conveying channel, the cost investment and the safety risk of tunnel tunneling, pipeline laying along the way, daily maintenance and the like are increased. By adopting the ground laying pipeline, the pipeline laying system is possibly limited by the ground morphology and the influence of buildings, and meanwhile, the external influence factors such as occupation of land, green occupation, coordination of the relationships of workers and farmers, environmental protection, safety and the like are more, so that the ground objective condition is limited, and the pipeline cannot be laid. However, with the progress and development of the underground long-distance horizontal directional drilling technology of the coal mine, different roadways can be accurately penetrated through by the underground directional drilling technology of the coal mine, and the purposes of water supply and drainage, gas drainage, ventilation, material supply and the like can be further achieved. In order to ensure the conveying capability and the service life of the long-distance horizontally oriented through hole, the hole diameter of the through hole is enlarged, and the through hole is reamed and the inside of the through hole is sleeved with a fixed pipe.

At present, when the long-distance near-horizontal through hole is subjected to reaming operation, normal flushing fluid circulation is difficult to form in a drilled hole, broken rock fragments of a reaming bit are difficult to flow back into a discharge hole, meanwhile, the broken rock fragments are easy to accumulate on the front side and the rear side of the advancing direction of the reaming bit, the accumulated rock fragments are easy to cause repeated breaking of the rock fragments of the reaming bit, the drilling efficiency is seriously affected, meanwhile, the accumulated rock fragments cannot be cleared in time, and complex working conditions such as jamming, drilling tool breakage and the like are easy to cause.

Disclosure of Invention

The application provides a coal mine reaming device, which aims to solve the problem that rock scraps cannot be cleared in time when the coal mine reaming device in the prior art reams holes.

In order to solve the above problems, the present application provides a coal mine reaming device comprising: the drill rod body is rotatably arranged; the hole-enlarging structure comprises a hole-enlarging drill rod and a hole-enlarging drill bit arranged on the hole-enlarging drill rod, the diameter of the hole-enlarging drill bit is larger than that of the hole-enlarging drill rod and that of the drill rod body, the hole-enlarging drill rod is arranged at one end of the drill rod body, the drill rod body drives the hole-enlarging drill rod to rotate, and the hole-enlarging drill bit is used for enlarging a coal mine via hole; the first water hole drill rods are arranged on the drill rod body at intervals and are used for flushing and discharging rock scraps generated after reaming of the reaming bit.

Further, the reaming bit includes bit body and a plurality of broken piece, and bit body's one end has a plurality of reaming teeth, and a plurality of reaming teeth are along bit body's circumference distribution, and bit body sets up on the reaming drilling rod, and a plurality of broken pieces are along bit body outer peripheral face's circumference interval distribution, and the reaming teeth is used for reaming the colliery via hole, and broken piece is used for breaking the detritus that the reaming teeth reamed and produced.

Further, the crushing piece comprises a blade and a plurality of diamond composite sheet teeth, the blade is arranged on the outer peripheral surface of the drill bit body, the plurality of diamond composite sheet teeth are arranged on the blade, the blade is of a spiral structure, and the blade and the diamond composite sheet teeth are used for crushing rock scraps generated by reaming of reaming teeth.

Further, the spiral direction of the blade is the same as the rotation direction of the drill rod body, and the spiral angle of the blade is 30-60 degrees.

Further, the first water hole drill rod comprises a first rod body, a thread groove and a plurality of first liquid guide holes, the first rod body is arranged on the drill rod body, the thread groove is arranged on the outer peripheral surface of the first rod body, the spiral direction of the thread groove is the same as the rotation direction of the drill rod body, the spiral angle of the thread groove is 30-60 degrees, the plurality of first liquid guide holes are distributed on the outer peripheral surface of the first rod body at intervals, the first liquid guide holes are used for flushing rock scraps generated after reaming of the reaming bit, and the thread groove is used for discharging the rock scraps generated after reaming of the reaming bit.

Further, the wall thickness of the first rod body is H, and the wall thickness of the drill rod body is H, wherein h=2h.

Further, the coal mine reaming device further comprises a drilling machine, the reaming structure further comprises a guide head, the coal mine reaming device has a positive circulation propulsion working condition, the drilling machine is in driving connection with the other end of the drill rod body under the positive circulation propulsion working condition, the drilling machine drives the drill rod body to rotate, reaming teeth are located on one side, deviating from the first water hole drill rod, of the drill bit body, and the guide head is connected with the reaming drill rod.

Further, the guide head comprises a guide rod body and a plurality of guide teeth, the guide teeth are distributed along the circumferential direction of the guide rod body, and the guide rod body is in threaded connection with the reaming drill rod.

Further, the coal mine reaming device comprises a second water hole drill rod and a drilling machine, the coal mine reaming device is provided with a reverse circulation pull-back working condition, the second water hole drill rod is in threaded connection with the reaming drill rod under the reverse circulation pull-back working condition, the drilling machine is in driving connection with the other end of the drill rod body, the drilling machine is used for driving the drill rod body to rotate, reaming teeth are located on one side of the drill bit body, facing the first water hole drill rod, of the second water hole drill rod, and rock scraps generated after reaming of the reaming drill bit are washed and discharged.

Further, the second water hole drill rod comprises a second rod body, a propeller blade and a plurality of second liquid guide holes, the second rod body is in threaded connection with the reaming drill rod, the propeller blade surrounds the second rod body, the plurality of second liquid guide holes are distributed on the outer peripheral surface of the second rod body at intervals, the second liquid guide holes are used for flushing rock scraps generated after reaming of the reaming bit, and the propeller blade is used for discharging the rock scraps generated after reaming of the reaming bit.

By applying the technical scheme of the application, the application provides a coal mine reaming device, which comprises: the drill rod body is rotatably arranged; the hole-enlarging structure comprises a hole-enlarging drill rod and a hole-enlarging drill bit arranged on the hole-enlarging drill rod, wherein the diameter of the hole-enlarging drill bit is directly larger than that of the hole-enlarging drill rod and that of the drill rod body, the hole-enlarging drill rod is arranged at one end of the drill rod body, the drill rod body drives the hole-enlarging drill rod to rotate, and the hole-enlarging drill bit is used for enlarging a coal mine via hole; the first water hole drill rods are arranged on the drill rod body at intervals and are used for flushing and discharging rock scraps generated after reaming of the reaming bit. By adopting the scheme, the diameter of the reaming bit is set to be larger than the diameter of the reaming drill rod and the diameter of the drill rod body, and the first water hole drill rods are arranged on the drill rod body at intervals, so that when the reaming bit is used for reaming, flushing fluid can be sprayed out from the first water hole drill rods, and rock scraps generated after the reaming of the reaming bit are timely flushed and discharged into a roadway, the rock scraps are prevented from being accumulated and repeatedly crushed by the reaming bit, the problem that the rock scraps cannot be timely removed when the coal mine reaming device is used for reaming in the prior art is effectively solved, and the conditions that the reaming bit is jammed, broken and the like in the operation process can be prevented.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:

fig. 1 shows a schematic structural diagram of a coal mine reaming drill pipe under a forward circulation propulsion working condition according to an embodiment of the application;

fig. 2 shows a schematic structural diagram of a coal mine reaming drill pipe under a reverse circulation pullback working condition according to an embodiment of the present application;

FIG. 3 shows a schematic view of the reaming structure of FIG. 1 in a forward-cycle propulsion mode;

FIG. 4 is a schematic view showing the structure of the reaming structure of FIG. 2 in a reverse-circulation pullback condition;

fig. 5 shows a schematic view of the first water hole drill pipe of fig. 1.

Wherein the above figures include the following reference numerals:

10. a drill rod body;

20. a reaming structure; 21. reaming a drill pipe; 22. reaming bit; 221. a bit body; 2211. reaming teeth; 222. a crushing member; 2221. a blade; 2222. diamond composite sheet teeth; 23. a guide head; 231. a guide rod body; 232. guide teeth;

30. the first water hole drill rod; 31. a first rod body; 32. a thread groove; 33. a first liquid guiding hole;

40. a drilling machine;

50. the second water hole drill rod; 51. a second rod body; 52. a propeller blade; 53. a second liquid guiding hole;

61. coal mine via holes.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. It will be apparent that the described embodiments are only some, but not all, embodiments of the application. The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the application, its application, or uses. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

As shown in fig. 1 to 5, an embodiment of the present application provides a coal mine reaming device, comprising: a drill rod body 10 rotatably provided; the reaming structure 20 comprises a reaming drill pipe 21 and a reaming bit 22 arranged on the reaming drill pipe 21, wherein the diameter of the reaming bit 22 is larger than that of the reaming drill pipe 21 and that of the drill pipe body 10, the reaming drill pipe 21 is arranged at one end of the drill pipe body 10, the drill pipe body 10 drives the reaming drill pipe 21 to rotate, and the reaming bit 22 is used for reaming a coal mine through hole 61; the first water hole drill rods 30 are arranged on the drill rod body 10 at intervals, and the first water hole drill rods 30 are used for flushing and discharging rock fragments generated after reaming of the reamer bit 22.

By adopting the scheme, the diameter of the reaming bit 22 is set to be larger than the diameters of the reaming drill rod 21 and the drill rod body 10, and the first water hole drill rods 30 are arranged on the drill rod body 10 at intervals, so that when the reaming bit 22 is in the reaming operation process, the first water hole drill rods 30 can spray flushing fluid, so that rock scraps generated after the reaming of the reaming bit 22 are timely flushed and discharged into a roadway, the rock scraps are prevented from being accumulated and the situation that the reaming bit 22 repeatedly breaks the rock scraps is avoided, the problem that the rock scraps cannot be timely cleared when a coal mine reaming device in the prior art is used for reaming is effectively solved, and the situation that the reaming bit 22 is jammed, broken and the like in the operation process can be prevented.

The reamer bit 22 includes a bit body 221 and a plurality of breaking members 222, one end of the bit body 221 has a plurality of reamer teeth 2211, the plurality of reamer teeth 2211 are distributed along the circumference of the bit body 221, the bit body 221 is disposed on the reamer rod 21, the plurality of breaking members 222 are distributed along the circumference of the outer circumferential surface of the bit body 221 at intervals, the reamer teeth 2211 are used for reaming the coal mine via hole 61, and the breaking members 222 are used for breaking rock fragments generated by reaming the reamer teeth 2211.

So arranged, the plurality of reaming teeth 2211 are distributed along the circumference of the bit body 221, such that reaming can be performed through the plurality of reaming teeth 2211; the plurality of crushing members 222 are circumferentially spaced along the outer peripheral surface of the drill body 221, and the plurality of crushing members 222 can crush rock fragments generated by reaming the reamer teeth 2211.

Further, the crushing member 222 includes a blade 2221 and a plurality of diamond compact teeth 2222, the blade 2221 is disposed on the outer circumferential surface of the drill bit body 221, the plurality of diamond compact teeth 2222 are disposed on the blade 2221 at intervals, the blade 2221 is in a spiral structure, and the blade 2221 and the diamond compact teeth 2222 are all used for crushing rock debris generated by reaming the reaming teeth 2211.

The blades 2221 are arranged to crush rock scraps generated by reaming of the reaming teeth 2211; the plurality of diamond compact teeth 2222 are arranged on the blade 2221 at intervals, so that rock fragments can be rapidly crushed, the formed drilling hole is good in circularity, and subsequent casing pipes can be conveniently and smoothly put into the through holes.

In this embodiment, the helical direction of the blade 2221 is the same as the rotational direction of the drill rod body 10, and the helical angle of the blade 2221 is 30 ° -60 °.

By adopting the above arrangement, the broken rock fragments of the reamer bit 22 can be effectively completely discharged back to the rear side of the reamer bit 22 in the advancing direction.

Specifically, the first water hole drill rod 30 includes a first rod body 31, a thread groove 32 and a plurality of first liquid guiding holes 33, the first rod body 31 is arranged on the drill rod body 10, the thread groove 32 is arranged on the outer circumferential surface of the first rod body 31, the spiral direction of the thread groove 32 is the same as the rotation direction of the drill rod body 10, the spiral angle of the thread groove 32 is 30 ° -60 °, the plurality of first liquid guiding holes 33 are distributed on the outer circumferential surface of the first rod body 31 at intervals, the first liquid guiding holes 33 are used for flushing rock scraps generated after reaming the reamer bit 22, and the thread groove 32 is used for discharging the rock scraps generated after reaming the reamer bit 22.

By the arrangement mode, broken rock fragments can be effectively driven to rotate along the thread grooves 32 to move out of the coal mine through holes 61, and finally the rock fragments are accumulated in the roadway. Meanwhile, by combining the design of the spiral direction and the spiral angle of the blade 2221, the rock scraps which are discharged back to the rear side of the advancing direction of the reamer bit can be effectively removed out of the coal mine through hole 61, and further the repeated breaking of the rock scraps by the reamer bit can be effectively reduced.

Wherein the wall thickness of the first rod body 31 is H, and the wall thickness of the drill rod body 10 is H, wherein h=2h.

The wall thickness H of the first rod body 31 is limited within the above range, so that the loss of the torsional strength, the compressive strength, the tensile strength and other strength of the first water hole drill rod 30 caused by the arrangement of the plurality of first liquid guide holes 33 can be prevented, and the working conditions of preventing the fatigue damage of the first water hole drill rod 30 from generating drill fracture and the like can be achieved.

As shown in fig. 1, in this embodiment, the coal mine reaming device further includes a drilling machine 40, the reaming structure 20 further includes a guide head 23, the coal mine reaming device has a forward-circulation propulsion working condition, under the forward-circulation propulsion working condition, the drilling machine 40 is in driving connection with the other end of the drill pipe body 10, the drilling machine 40 drives the drill pipe body 10 to rotate, the reaming teeth 2211 are located on one side, away from the first water hole drill pipe 30, of the drill bit body 221, and the guide head 23 is connected with the reaming drill pipe 21.

So set up, under forward circulation propelled operating mode, when the high-pressure large discharge capacity flushing fluid flows through the interior runner of first water hole drilling rod 30, from a plurality of first drain holes 33 high-speed sprays and go out, the flushing fluid that high-speed sprays and destroy the detritus bed that the broken detritus of reamer bit 22 formed, and can reduce the sticky degree of the broken detritus of reamer bit 22 simultaneously, and then make broken detritus more easily rotate along with the rotation of first water hole drilling rod 30, broken detritus is discharged more smoothly outside colliery via hole 61, and then reach the complicated operating mode such as prevention card bores, drilling tool fracture.

It should be noted that: the drill rod body 10, the first water hole drill rod 30 and the reaming bit 22 are tightly connected through a thread pin and a thread box, and the design of the threaded connection between the two is continuously strengthened along with the rotation power direction output by the drilling machine 40.

Wherein the design guide head 23 can limit the whole forward circulation pushing working condition under-reaming drilling operation to always advance along the pre-drilled coal mine through hole 61.

The guide head 23 includes a guide rod 231 and a plurality of guide teeth 232, the plurality of guide teeth 232 are distributed along a circumferential direction of the guide rod 231, and the guide rod 231 is in threaded connection with the reamer rod 21.

The plurality of guide teeth 232 are distributed along the circumferential direction of the guide rod body 231 so that the guide teeth 232 can function as guides.

As shown in fig. 2, the coal mine reaming device comprises a second water hole drill pipe 50 and a drilling machine 40, the coal mine reaming device has a reverse circulation pull-back working condition, under the reverse circulation pull-back working condition, the second water hole drill pipe 50 is in threaded connection with the reaming drill pipe 21, the drilling machine 40 is in driving connection with the other end of the drill pipe body 10, the drilling machine 40 drives the drill pipe body 10 to rotate, reaming teeth 2211 are located on one side of a drill bit body 221, facing the first water hole drill pipe 30, and the second water hole drill pipe 50 is used for flushing and discharging rock scraps generated after reaming of the reaming bit 22.

By the arrangement, under the reverse circulation pull-back working condition, broken rock scraps of the reamer bit 22 can be effectively discharged back to the rear side of the forward direction of the reamer bit. The blades 2221 of the reamer bit 22 are embedded with diamond composite sheet teeth 2222, which can quickly crush rock strata and ensure that the formed drill holes have better circularity, thereby facilitating the subsequent casing to smoothly go into the through holes.

The second water hole drill rod 50 comprises a second rod body 51, a propeller blade 52 and a plurality of second liquid guide holes 53, the second rod body 51 is in threaded connection with the reaming drill rod 21, the propeller blade 52 surrounds the second rod body 51, the plurality of second liquid guide holes 53 are distributed on the outer circumferential surface of the second rod body 51 at intervals, the second liquid guide holes 53 are used for flushing rock scraps generated after reaming of the reaming bit 22, and the propeller blade 52 is used for discharging the rock scraps generated after reaming of the reaming bit 22.

So set up, the screw direction of screw blade oar 52 is opposite with rig 40 normal rotation output power direction, and the screw angle of screw blade oar 52 is 30 ~ 60, and screw blade oar 52 and the welding of second water hole drilling rod 50, joint strength is higher, can effectively with piling up the rotatory stirring of the detritus of reverse circulation pull back reamer bit 22 forward direction drill bit rear side, simultaneously along screw blade oar 52 back row outside colliery via hole 61, in the final detritus piles up the tunnel. Meanwhile, by combining the design of the reamer bit 22, rock scraps which are discharged back to the rear side of the advancing direction of the reamer bit 22 can be effectively removed out of the coal mine via holes 61, complex working condition risks such as drill sticking and drilling tool breakage are effectively reduced, and repeated breaking of the rock scraps by the reamer bit 22 is effectively reduced.

Optionally, the second water hole drill rod 50, the reaming bit 22, the drill rod body 10 and the first water hole drill rod 30 are tightly connected through a thread pin and a thread box, and the design of the threaded connection between the two is continuously strengthened along with the rotation power direction output by the drilling machine.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.

The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present application unless it is specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective parts shown in the drawings are not drawn in actual scale for convenience of description. Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but should be considered part of the specification where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.

In the description of the present application, it should be understood that the azimuth or positional relationships indicated by the azimuth terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal", and "top, bottom", etc., are generally based on the azimuth or positional relationships shown in the drawings, merely to facilitate description of the present application and simplify the description, and these azimuth terms do not indicate and imply that the apparatus or elements referred to must have a specific azimuth or be constructed and operated in a specific azimuth, and thus should not be construed as limiting the scope of protection of the present application; the orientation word "inner and outer" refers to inner and outer relative to the contour of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "upper surface at … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

In addition, the terms "first", "second", etc. are used to define the components, and are only for convenience of distinguishing the corresponding components, and the terms have no special meaning unless otherwise stated, and therefore should not be construed as limiting the scope of the present application.

The above description is only of the preferred embodiments of the present application and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims (10)

1. A coal mine reaming device, comprising:

a drill rod body (10) rotatably provided;

the reaming structure (20), reaming structure (20) include reaming drilling rod (21) and set up reaming bit (22) on reaming drilling rod (21), the diameter of reaming bit (22) is greater than reaming drilling rod (21) the diameter of drilling rod body (10), reaming drilling rod (21) set up in one end of drilling rod body (10), drilling rod body (10) drive reaming drilling rod (21) rotate, reaming bit (22) are used for reaming colliery via hole (61);

the drill rod assembly comprises a drill rod body (10), a plurality of first water hole drill rods (30) and a plurality of first water hole drill rods (30), wherein the first water hole drill rods (30) are arranged on the drill rod body (10) at intervals, and the first water hole drill rods (30) are used for flushing and discharging rock scraps generated after reaming of a reaming bit (22).

2. The coal mine reaming device according to claim 1, wherein the reaming bit (22) comprises a bit body (221) and a plurality of breaking members (222), one end of the bit body (221) is provided with a plurality of reaming teeth (2211), the plurality of reaming teeth (2211) are distributed along the circumference of the bit body (221), the bit body (221) is arranged on the reaming rod (21), the plurality of breaking members (222) are distributed at intervals along the circumference of the outer circumferential surface of the bit body (221), the reaming teeth (2211) are used for reaming the coal mine through holes (61), and the breaking members (222) are used for breaking rock fragments generated by reaming the reaming teeth (2211).

3. The coal mine reaming device of claim 2, wherein the breaking member (222) comprises a blade (2221) and a plurality of diamond compact teeth (2222), the blade (2221) is disposed on an outer circumferential surface of the drill bit body (221), the plurality of diamond compact teeth (2222) are disposed on the blade (2221) at intervals, the blade (2221) is in a spiral structure, and the blade (2221) and the diamond compact teeth (2222) are both used for breaking rock debris generated by reaming the reaming teeth (2211).

4. A coal mine reaming apparatus according to claim 3, characterised in that the helical direction of the blades (2221) is the same as the direction of rotation of the drill rod body (10), the helix angle of the blades (2221) being 30 ° -60 °.

5. The coal mine reaming device according to claim 2, wherein the first water hole drill pipe (30) comprises a first rod body (31), a thread groove (32) and a plurality of first liquid guide holes (33), the first rod body (31) is arranged on the drill pipe body (10), the thread groove (32) is arranged on the outer circumferential surface of the first rod body (31), the spiral direction of the thread groove (32) is the same as the rotation direction of the drill pipe body (10), the spiral angle of the thread groove (32) is 30-60 degrees, the plurality of first liquid guide holes (33) are distributed on the outer circumferential surface of the first rod body (31) at intervals, the first liquid guide holes (33) are used for flushing rock scraps generated after reaming of the drill bit (22), and the thread groove (32) is used for discharging the rock scraps generated after reaming of the drill bit (22).

6. The coal mine reaming device of claim 5, wherein the wall thickness of the first rod body (31) is H, the wall thickness of the drill pipe body (10) is H, and H = 2H.

7. The coal mine reaming device according to claim 2, further comprising a drilling machine (40), wherein the reaming structure (20) further comprises a guide head (23), the coal mine reaming device has a forward circulation propulsion working condition, the drilling machine (40) is in driving connection with the other end of the drill rod body (10) under the forward circulation propulsion working condition, the drilling machine (40) drives the drill rod body (10) to rotate, the reaming teeth (2211) are located on one side, away from the first water hole drill rod (30), of the drill bit body (221), and the guide head (23) is connected with the reaming drill rod (21).

8. The coal mine reaming device of claim 7, wherein the guide head (23) comprises a guide rod body (231) and a plurality of guide teeth (232), the plurality of guide teeth (232) being distributed along a circumferential direction of the guide rod body (231), the guide rod body (231) and the reaming rod (21) being threadedly connected.

9. The coal mine reaming device according to claim 2, characterized in that the coal mine reaming device comprises a second water hole drill pipe (50) and a drilling machine (40), the coal mine reaming device has a reverse circulation back-pull type working condition, the second water hole drill pipe (50) is in threaded connection with the reaming drill pipe (21) under the reverse circulation back-pull type working condition, the drilling machine (40) is in driving connection with the other end of the drill pipe body (10), the drilling machine (40) drives the drill pipe body (10) to rotate, the reaming teeth (2211) are located on one side of the drill bit body (221) facing the first water hole drill pipe (30), and the second water hole drill pipe (50) is used for flushing and discharging rock debris generated after reaming of the reaming bit (22).

10. The coal mine reaming device according to claim 9, wherein the second water hole drill pipe (50) comprises a second rod body (51), a propeller blade (52) and a plurality of second liquid guide holes (53), the second rod body (51) is in threaded connection with the reaming drill pipe (21), the propeller blade (52) surrounds the second rod body (51), the plurality of second liquid guide holes (53) are distributed on the outer peripheral surface of the second rod body (51) at intervals, the second liquid guide holes (53) are used for flushing rock scraps generated after reaming of the reaming bit (22), and the propeller blade (52) is used for discharging the rock scraps generated after reaming of the reaming bit (22).