A reaming device for coal mine geological exploration

Abstract

The application belongs to the technical field of coal mines, and discloses a reaming device for coal mine geological exploration, which comprises a supporting frame and further comprises: a reaming assembly, which is arranged at the bottom of the supporting frame through a transmission assembly, and the transmission assembly is used for adjusting the inner diameter of the reaming assembly. The height of the adjusting circular table in the supporting part is adjusted through the transmission assembly. Since the inner wall of the crushing part is attached to the outer part of the adjusting circular table, and the adjusting circular table is in the shape of a circular table, the height of the adjusting circular table is adjusted, and the outer diameter of the crushing part is controlled under the action of the outer diameter of the adjusting circular table. The motor drives the drill rod and the drill bit to drill and sample the coal mine geology. The crushing teeth on the outer part of the crushing part are in contact with the soil during the drilling process, and the inner wall of the crushing part is in contact with the outer part of the adjusting circular table, so that the crushing part is prevented from being deformed and damaged after being subjected to the resistance of the soil or rock, and the stability and service life of the reaming of the crushing part are improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of coal mines, and particularly relates to a reaming device for coal mine geological exploration. BACKGROUND

[0002] Coal mine geological exploration refers to a professional work of providing scientific basis for coal resource evaluation, development design and safety production by comprehensively studying geological structure, coal seam distribution, coal quality characteristics, hydrogeological conditions and mining technical conditions of a coal mine area through systematic geological investigation, geophysical detection, drilling sampling and experimental analysis and the like. A core target thereof is to find out occurrence state and economic value of coal resources and reduce mining risk. In the coal mine geological exploration, drilling sampling reaming refers to a process of expanding a diameter on the basis of an original drill hole by drilling equipment for a coal seam or surrounding rock to meet specific requirements (such as increasing a sampling amount, installing a monitoring device or improving a hole wall stability).

[0003] A geological exploration reaming device disclosed in Chinese Patent Application No. CN118273658A includes a support frame, two sides of the support frame are fixedly connected with the ground, a lifting device is arranged on the support frame, a drilling device includes a drill rod and a driving motor, the driving motor is arranged on the lifting device, the drill rod is vertically arranged, the top of the drill rod is fixedly connected with an output shaft of the driving motor and the driving motor is used for driving the drill rod to rotate, a drill bit for advancing is arranged at the bottom of the drill rod, a reaming device is arranged at the upper portion of the drill bit, the reaming device is connected with the support frame through a connecting piece, the reaming device is connected with the drill rod in a sleeve manner, a locking device is arranged between the reaming device and the drill rod, the reaming device includes a plurality of reaming discs, the diameters of the plurality of reaming discs are different, each of the plurality of reaming discs includes a connecting column and a plurality of reaming arms which are uniformly distributed in a radial manner around the connecting column. The reaming device can select the reaming disc with a required diameter according to requirements, is convenient to use and has high working efficiency.

[0004] The prior art disclosed above supports the reaming disc by the hydraulic telescopic rod, and the reaming disc and the drill bit of the drill rod rotate to achieve the purpose of reaming. Since the reaming disc is in a cross shape, the end support is poor, the reaming disc and the hydraulic telescopic rod are subjected to large torsion in the reaming process, and if the reaming encounters a large rock hardness, the reaming disc is prone to deformation and the hydraulic telescopic rod is prone to damage, thereby affecting subsequent use and increasing maintenance cost of the equipment. Therefore, the reaming device for coal mine geological exploration is provided. SUMMARY

[0005] To solve the problems in the background art, the reaming device for coal mine geological exploration is provided, and the problems of poor support of the existing reaming device and easy deformation and damage of the reaming device when encountering rocks are solved.

[0006] To achieve the above object, the present application provides the following technical scheme: A reaming device for coal mine geological exploration, comprising a support frame, further comprising:

[0007] A reaming assembly is arranged at the bottom of the support frame through a transmission assembly, which is used to adjust the inner diameter of the reaming assembly;

[0008] The reaming assembly comprises a motor mounted at the top of the support frame, and the output end of the motor is provided with a transmission rod, and the bottom of the transmission rod is fixedly provided with a drill bit;

[0009] A support member is fixedly arranged at the top of the drill bit outside the transmission rod, and a sliding groove is formed in the outer part of the support member, and a crushing member is slidably arranged in the sliding groove;

[0010] An adjusting circular table is fixedly arranged outside the transmission assembly, which is located inside the support member, and the inner wall of the crushing member is attached to the outside of the adjusting circular table;

[0011] The adjusting circular table is in the shape of a circular table, and the outer part of the crushing member is provided with crushing teeth.

[0012] Preferably, the outer diameter of the support member gradually decreases from top to bottom, and the outer diameter of the bottom of the support member is smaller than the outer diameter of the drill bit, and the outer wall of the support member is provided with crushing teeth.

[0013] Preferably, the transmission assembly comprises a threaded rod fixedly arranged at the bottom of the support frame, a nut is threadedly sleeved outside the threaded rod, a connecting member is movably sleeved at the bottom of the nut, and a connecting rod is fixedly arranged at the bottom of the connecting member.

[0014] Preferably, the connecting rod is sleeved outside the transmission rod, and the adjusting circular table is movably sleeved outside the transmission rod;

[0015] A guide rod for vertical movement of the connecting member is fixedly arranged at the bottom of the support frame;

[0016] Rotating the nut moves up and down along the surface of the threaded rod, and the connecting rod and the adjusting circular table are synchronously moved up and down through the connecting member.

[0017] Preferably, the tamping assembly comprises a fixing member fixedly arranged outside the connecting rod, and two lugs are arranged in an array outside the fixing member;

[0018] A pushing plate is movably arranged on the crushing member, and an elastic member is arranged on the crushing member to support the pushing plate.

[0019] Preferably, a transmission member is fixedly arranged at the side of the pushing plate, and the thickness of the fixing member and the external lugs is greater than the height of the transmission member;

[0020] The side of the transmission member is rounded;

[0021] The transmission member is driven by the elastic member, and the rotation of the transmission member extrudes the elastic member to the outer end along the lug outside the fixing member.

[0022] Preferably, the middle part of the crushing member is movably provided with a rammer block, and the inside of the rammer block is movably provided with a valve plate, and the valve plate is fixedly connected with the push plate.

[0023] Preferably, the water injection assembly comprises a flow distribution box movably arranged outside the connecting rod, and the flow distribution box is in contact with the inner wall of the support member through a movable frame.

[0024] The top of the flow distribution box is provided with a connecting pipe penetrating through the top of the support member, and the connecting pipe is connected with a water injection pump to inject water into the flow distribution box.

[0025] Preferably, a fixed pipe is fixed on the crushing member, the fixed pipe is communicated with the flow distribution box through a butt joint pipe, and the butt joint pipe is slidably arranged at the bottom of the flow distribution box through a butt joint ring.

[0026] The valve plate is fixedly provided with a movable pipe communicated with the inside of the rammer block, the end of the movable pipe is sleeved outside the fixed pipe, and the end of the fixed pipe is provided with a water passing hole communicated with the movable pipe.

[0027] Preferably, the bottom of the rammer block is provided with a first drainage hole, and the bottom of the support member is provided with a second drainage hole communicated with the first drainage hole.

[0028] Compared with the prior art, the beneficial effects of the present application are as follows:

[0029] The present application adjusts the height of the adjusting circular table in the support member through the transmission assembly, the inner wall of the crushing member is attached to the outside of the adjusting circular table, and the adjusting circular table is in the shape of a circular table, the height of the adjusting circular table is adjusted, the outer diameter of the crushing member is controlled under the action of the outer diameter of the adjusting circular table, the motor drives the drill rod and the drill bit to drill and sample the coal mine geology, the crushing teeth on the outside of the crushing member are in contact with the soil during the drilling process, the inner wall of the crushing member is in contact with the outside of the adjusting circular table, the crushing member is prevented from being deformed and damaged after being subjected to the resistance of the soil or rock, and the stability and service life of the crushing member are improved.

[0030] The application is characterized in that the transmission member moves outwardly to the outer end of the lug of the fixed member during the rotation of the support member and the breaking member, thereby pushing the valve plate and the movable pipe to move outwardly, so that the water hole is disconnected with the movable pipe, at this time, water cannot enter the ramming block, meanwhile, the first drainage hole is blocked by the bottom during the movement of the valve plate, so that the water in the ramming block cannot be discharged, at this time, the transmission member can push the valve plate and the ramming block to move outwardly synchronously, and the ramming block applies pressure to the inner wall of the hole, so that the collapse of the hole is avoided;

[0031] When the transmission member is separated from the contact with the lug of the fixed member, the elastic member pushes the push plate, the valve plate and the ramming block to reset, at this time, water can enter the distribution box and the ramming block, and is discharged through the second drainage hole, in this process, intermittent water spraying occurs, so that the collapse phenomenon caused by excessive water is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 It is a schematic diagram of the overall appearance structure of the application;

[0033] Figure 2 It is a schematic diagram of the appearance structure of the hole expanding assembly of the application;

[0034] Figure 3 It is a schematic diagram of the cooperation structure of the hole expanding assembly and the ramming assembly of the application;

[0035] Figure 4 It is a schematic diagram of the top view sectional structure of the hole expanding assembly and the ramming assembly of the application;

[0036] Figure 5 It is a schematic diagram of the internal sectional structure of the application;

[0037] Figure 6 It is a schematic diagram of the internal sectional structure of the application; Figure 5 It is a schematic diagram of the enlarged structure at A of the application;

[0038] Figure 7 It is a schematic diagram of the enlarged structure at B of the application; Figure 5 It is a schematic diagram of the enlarged structure at B of the application;

[0039] Figure 8 It is a schematic diagram of the enlarged structure at C of the application. Figure 5 It is a schematic diagram of the enlarged structure at C of the application.

[0040] In the diagram: 1. Support frame; 2. Transmission assembly; 21. Nut; 22. Connector; 23. Threaded rod; 24. Connecting rod; 3. Water injection assembly; 31. Connecting pipe; 32. Diverter box; 33. Connecting ring; 34. Connecting pipe; 35. Movable pipe; 36. Fixed pipe; 37. Water passage hole; 4. Hole expansion assembly; 41. Support component; 42. Breaking component; 43. Transmission rod; 44. Sliding groove; 45. Adjusting frustum; 5. Compaction assembly; 51. Compaction block; 52. Valve plate; 53. Push plate; 54. Transmission component; 55. Fixing component; 56. Elastic component; 511. First drainage hole; 512. Second drainage hole. Detailed Implementation

[0041] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0042] like Figures 1 to 8 As shown, the present invention provides a borehole enlargement device for coal mine geological exploration, including a support frame 1, and further comprising:

[0043] The hole-expanding assembly 4 is mounted on the bottom of the support frame 1 via the transmission assembly 2. The transmission assembly 2 is used to adjust the inner diameter of the hole expanded by the hole-expanding assembly 4.

[0044] The hole-reaming assembly 4 includes a motor mounted on the top of the support frame 1, and a transmission rod 43 is provided at the output end of the motor. A drill bit is fixedly mounted at the bottom of the transmission rod 43.

[0045] A support member 41 is fixedly installed on the outside of the transmission rod 43 and on the top of the drill bit. A sliding groove 44 is provided on the outside of the support member 41, and a hole-expanding crushing member 42 is slidably arranged inside the sliding groove 44.

[0046] An adjusting frustum 45 is fixedly mounted on the outside of the transmission assembly 2. The adjusting frustum 45 is located inside the support member 41, and the inner wall of the crushing member 42 is in contact with the outside of the adjusting frustum 45.

[0047] The adjusting frustum 45 is frustum shaped, and the crushing component 42 is provided with crushing teeth on its exterior.

[0048] The height of the adjusting circular platform 45 in the support 41 is adjusted by the transmission assembly 2. Since the inner wall of the crushing member 42 is attached to the outer part of the adjusting circular platform 45, and the adjusting circular platform 45 is in the shape of a circular platform, the height of the adjusting circular platform 45 is adjusted, and the outer diameter of the adjusting circular platform 45 controls the outward movement of the crushing member 42. The motor drives the drill rod and the drill bit to drill and sample the coal mine geology. During the drilling process, the crushing teeth on the outer part of the crushing member 42 are in contact with the soil, and the inner wall of the crushing member 42 is in contact with the outer part of the adjusting circular platform 45, which prevents the crushing member 42 from being damaged by the resistance of the soil or rock. This improves the stability and service life of the crushing member 42.

[0049] As shown in Figure 1 With Figure 2 the outer diameter of the support 41 gradually decreases from top to bottom, and the outer diameter of the bottom of the support 41 is smaller than the outer diameter of the drill bit. The outer wall of the support 41 is provided with crushing teeth.

[0050] During the reaming process by rotating the drill rod and the drill bit driven by the motor, the drill bit continuously penetrates into the soil. Since the outer diameter of the support 41 gradually decreases from top to bottom, the support 41 is more easily penetrated into the soil, thereby reducing the resistance of the drill bit moving downward and reducing the power of the motor.

[0051] As shown in Figure 1 the transmission assembly 2 includes a threaded rod 23 fixed to the bottom of the support frame 1. The outer part of the threaded rod 23 is threadedly sleeved with a nut 21. The bottom of the nut 21 is movably sleeved with a connecting member 22. The bottom of the connecting member 22 is fixed with a connecting rod 24.

[0052] The connecting rod 24 is sleeved on the outside of the transmission rod 43, and the adjusting circular platform 45 is movably sleeved on the outside of the transmission rod 43.

[0053] The bottom of the support frame 1 is fixed with a guide rod for vertical movement of the connecting member 22.

[0054] Rotating the nut 21 moves up and down along the surface of the threaded rod 23, and the connecting rod 24 and the adjusting circular platform 45 move up and down synchronously through the connecting member 22.

[0055] When the outer diameter of the support 41 needs to be adjusted, the nut 21 is rotated to move up and down along the outside of the threaded rod 23. Since the nut 21 is movably connected with the connecting member 22, the connecting rod 24 and the adjusting circular platform 45 are moved by the up and down movement of the nut 21, so that the outer diameter of the crushing member 42 can be adjusted. At the same time, the connecting member 22 moves vertically under the action of the guide rod during the up and down movement, so as to avoid the rotating phenomenon.

[0056] As shown in Figures 3-5 the tamping assembly 5 includes a fixing member 55 fixed to the outside of the connecting rod 24, and the outside of the fixing member 55 is arrayed with two lugs.

[0057] A push plate 53 is movably provided on the crushing component 42, and an elastic element 56 is provided on the crushing component 42 to support the push plate 53.

[0058] A transmission component 54 is fixedly mounted on the side of the push plate 53, and the thickness of the fixing component 55 and the external lug is greater than the height of the transmission component 54.

[0059] The side of the transmission component 54 is rounded.

[0060] Under the action of the elastic member 56, the transmission member 54 rotates and presses the elastic member 56 outward along the lug outside the fixed member 55.

[0061] A compaction block 51 is movably disposed in the middle of the crushing component 42, and a valve plate 52 is movably disposed inside the compaction block 51. The valve plate 52 is fixedly connected to the push plate 53.

[0062] The motor drives the transmission rod 43, support member 41 and crushing member 42 to rotate to perform hole enlargement. The transmission member 54 rotates synchronously with the crushing member 42 and is pushed outward by the lug of the fixing member 55 to push the transmission member 54 and the push plate 53 and compress the elastic member 56. At the same time, the push plate 53 pushes the compaction block 51 to move outward.

[0063] This explains that during the up-and-down adjustment of the adjusting frustum 45 and the fixed member 55 via the transmission assembly 2, the transmission member 54 is always in contact with the lug on the outside of the fixed member 55 during its rotation, and is pushed outward by the lug.

[0064] like Figures 5-8 As shown, the water injection assembly 3 includes a diversion box 32 movably disposed outside the connecting rod 24, and the diversion box 32 contacts the inner wall of the support member 41 through a movable frame;

[0065] The top of the diversion box 32 is provided with a connecting pipe 31 that passes through the top of the support member 41, and the water pump is connected to the connecting pipe 31 to inject water into the diversion box 32.

[0066] A fixed pipe 36 is fixedly installed on the crushing component 42. The fixed pipe 36 is connected to the diversion box 32 through the connecting pipe 34. The connecting pipe 34 slides at the bottom of the diversion box 32 through the docking ring 33.

[0067] A movable pipe 35 that communicates with the inside of the compaction block 51 is fixedly mounted on the valve plate 52. The end of the movable pipe 35 is sleeved on the outside of the fixed pipe 36. A water passage hole 37 that communicates with the movable pipe 35 is opened at the end of the fixed pipe 36.

[0068] The bottom of the compacted block 51 is provided with a first drainage hole 511, and the bottom of the support member 41 is provided with a second drainage hole 512 that communicates with the first drainage hole 511.

[0069] The support 41 and the crushing piece 42 are rotated by the motor to carry out the reaming process, water is injected into the distribution box 32 by the water pump and the connecting pipe 31, and then enters the valve plate 52 through the butt joint pipe 34, the fixed pipe 36, the water passage 37 and the movable pipe 35, and is discharged through the first drainage hole 511 and the second drainage hole 512, so that the reaming efficiency is improved, and the service life of the drill bit is improved;

[0070] When the support 41 and the crushing piece 42 rotate, the transmission member 54 moves outward under the action of the external lug of the fixing member 55, so as to push the valve plate 52 and the movable pipe 35 to move outward, so that the water passage 37 is disconnected from the movable pipe 35, at this time, water cannot enter the ramming block 51, and at the same time, the valve plate 52 is blocked at the bottom of the first drainage hole 511 during movement, so that the water in the ramming block 51 cannot be discharged, at this time, the transmission member 54 can push the valve plate 52 and the ramming block 51 to move outward synchronously, and the ramming block 51 can apply pressure to the inner wall of the hole to avoid the collapse of the hole;

[0071] When the transmission member 54 is disconnected from the external lug of the fixing member 55, the elastic member 56 pushes the push plate 53, the valve plate 52 and the ramming block 51 to reset, at this time, water can enter the distribution box 32 and the ramming block 51, and be discharged through the second drainage hole 512, in this process, intermittent water spraying occurs to avoid the collapse phenomenon caused by excessive water, and the support 41 is arranged outside the second drainage hole 512 and on both sides of the second drainage hole 512, and the rotating process avoids soil from blocking the second drainage hole 512 by the soil retaining plate.

[0072] The working principle and use process of the present application are as follows:

[0073] The nut 21 moves up and down along the outside of the threaded rod 23, the nut 21 is movably connected with the connecting piece 22, the connecting rod 24 and the adjusting circular table 45 are driven to move by the up and down movement of the nut 21, so that the outer diameter of the crushing piece 42 can be adjusted, and the connecting piece 22 moves vertically under the action of the guide rod during the up and down movement, the inner wall of the crushing piece 42 is attached to the outside of the adjusting circular table 45, and the adjusting circular table 45 is in the shape of a circular table, the height of the adjusting circular table 45 is adjusted, and the outer diameter of the adjusting circular table 45 controls the outward movement of the crushing piece 42, the motor drives the drill rod and the drill bit to carry out the drilling and sampling process on the coal mine geology, the crushing teeth on the outside of the crushing piece 42 contact the soil during drilling, and the inner wall of the crushing piece 42 abuts against the outside of the adjusting circular table 45, so that the crushing piece 42 will not be damaged due to deformation under the resistance of the soil or rock;

[0074] The support 41 and the breaking piece 42 are driven to rotate by the motor to perform the reaming process, water is injected into the distribution box 32 through the water pump and the connecting pipe 31, and then enters the valve plate 52 through the butt joint pipe 34, the fixed pipe 36, the water passage 37 and the movable pipe 35, and is discharged through the first drainage hole 511 and the second drainage hole 512, thereby improving the reaming efficiency and the service life of the drill bit.

[0075] When the support 41 and the breaking piece 42 rotate, the transmission member 54 moves outward under the action of the external lug of the fixing member 55, thereby pushing the valve plate 52 and the movable pipe 35 to move outward, so that the water passage 37 is disconnected from the movable pipe 35, at this time, water cannot enter the ramming block 51, and at the same time, the valve plate 52 blocks the first drainage hole 511 during movement, so that water in the ramming block 51 cannot be discharged, at this time, the transmission member 54 can push the valve plate 52 and the ramming block 51 to move outward synchronously, and the ramming block 51 can apply pressure to the inner wall of the hole to avoid the collapse of the hole.

[0076] When the transmission member 54 is disconnected from the external lug of the fixing member 55, the elastic member 56 pushes the push plate 53, the valve plate 52 and the ramming block 51 to reset, at this time, water can enter the distribution box 32 and the ramming block 51, and be discharged through the second drainage hole 512, in this process, intermittent water spraying occurs to avoid the collapse phenomenon caused by excessive water.

[0077] It should be noted that in this text, relationship terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between the entities or operations. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment.

[0078] Although the embodiments of the present application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to the embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A borehole enlargement device for coal mine geological exploration, comprising a support frame (1), characterized in that: Also includes: Hole-expanding assembly (4), the hole-expanding assembly (4) is disposed at the bottom of the support frame (1) via a transmission assembly (2), the transmission assembly (2) is used to adjust the inner diameter of the hole-expanding assembly (4); The hole-reaming assembly (4) includes a motor mounted on the top of the support frame (1), and a transmission rod (43) is provided at the output end of the motor. A drill bit is fixedly mounted at the bottom of the transmission rod (43). A support member (41) is fixedly installed on the outside of the transmission rod (43) and on the top of the drill bit. A sliding groove (44) is provided on the outside of the support member (41), and a hole-expanding breaker (42) is slidably arranged inside the sliding groove (44). An adjusting frustum (45) is fixedly mounted on the outside of the transmission assembly (2). The adjusting frustum (45) is located inside the support member (41), and the inner wall of the crushing member (42) is in contact with the outside of the adjusting frustum (45). The adjusting frustum (45) is frustum shaped, and the crushing component (42) is provided with crushing teeth on its exterior; The transmission assembly (2) includes a threaded rod (23) fixedly mounted on the bottom of the support frame (1). A nut (21) is fitted on the outer thread of the threaded rod (23). A connector (22) is movably fitted on the bottom of the nut (21). A connecting rod (24) is fixedly mounted on the bottom of the connector (22). The connecting rod (24) is sleeved on the outside of the transmission rod (43), and the adjusting frustum (45) is movably sleeved on the outside of the transmission rod (43); The bottom of the support frame (1) is fixed with a guide rod for the vertical movement of the connector (22); Rotating the nut (21) causes it to move up and down along the surface of the threaded rod (23), which in turn drives the connecting rod (24) and the adjusting platform (45) to move up and down synchronously through the connector (22); The tamping component (5) includes a fastener (55) fixed to the outside of the connecting rod (24), and the fastener (55) has two lugs arranged on its outer array. A push plate (53) is movably provided on the crushing component (42), and an elastic element (56) is provided on the crushing component (42) to support the push plate (53).

2. The borehole enlargement device for coal mine geological exploration according to claim 1, characterized in that: The outer diameter of the support member (41) gradually decreases from top to bottom. The outer diameter of the bottom of the support member (41) is smaller than the outer diameter of the drill bit. The outer wall of the support member (41) is provided with breaking teeth.

3. The borehole enlargement device for coal mine geological exploration according to claim 1, characterized in that: The side of the push plate (53) is fixed with a transmission component (54), and the thickness of the fixing component (55) and the external lug is greater than the height of the transmission component (54). The side of the transmission component (54) is rounded; Under the action of the elastic member (56), the transmission member (54) rotates and moves outward along the lug outside the fixed member (55) to squeeze the elastic member (56).

4. The borehole enlargement device for coal mine geological exploration according to claim 3, characterized in that: A compaction block (51) is movably disposed in the middle of the crushing component (42), and a valve plate (52) is movably disposed inside the compaction block (51). The valve plate (52) is fixedly connected to the push plate (53).

5. The borehole enlargement device for coal mine geological exploration according to claim 4, characterized in that: The water injection assembly (3) includes a diversion box (32) movably disposed outside the connecting rod (24), the diversion box (32) contacting the inner wall of the support member (41) via a movable frame; The top of the diversion box (32) is provided with a connecting pipe (31) that passes through the top of the support (41), and the water pump connected to the connecting pipe (31) injects water into the diversion box (32).

6. The borehole enlargement device for coal mine geological exploration according to claim 5, characterized in that: A fixed pipe (36) is fixedly installed on the crushing component (42). The fixed pipe (36) is connected to the diversion box (32) through a connecting pipe (34). The connecting pipe (34) slides on the bottom of the diversion box (32) through a connecting ring (33). The valve plate (52) is fixedly equipped with a movable pipe (35) that communicates with the inside of the compaction block (51). The end of the movable pipe (35) is sleeved on the outside of the fixed pipe (36). The end of the fixed pipe (36) is provided with a water passage hole (37) that communicates with the movable pipe (35).

7. The borehole enlargement device for coal mine geological exploration according to claim 6, characterized in that: The bottom of the compaction block (51) is provided with a first drainage hole (511), and the bottom of the support member (41) is provided with a second drainage hole (512) that communicates with the first drainage hole (511). The support member (41) is provided with a retaining plate on the outside, which is located on both sides of the second drainage hole (512).

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