Coal mine underground gas circulation pumping drainage device

Abstract

The invention relates to an underground coal mine gas circulation pumping drainage device, and belongs to the field of coal mine gas drainage. The device comprises a fan module, a motor driving module, a belt transmission module, a guide moving module, a gas collection tank module and an installation adjusting module. The fan module is fixedly installed on one side of the box body, and the motor driving module is fixedly installed on the box body and comprises a motor and a rotating rod connected to the corresponding position of the motor; the belt transmission module is fixedly connected to the rotating rod and comprises a driving belt wheel and a transmission belt. The guide moving module is fixedly connected into the box body; the gas collection box module is fixedly connected to the bottom end in the box body and comprises a gas collection box and a round pipe; the installation adjusting module is fixedly connected to the side wall of the box body. By optimizing the design of the spraying system, the two atomizing nozzles can reciprocate up and down and left and right during spraying, and the contact area and the contact uniformity of water mist and gas are improved, so that the filtering quality and the filtering efficiency of the gas are remarkably improved.

Description

Technical Field

[0001] The invention belongs to the field of coal mine gas emission, and relates to a coal mine underground gas circulation extraction device. Background Art

[0002] Coal mining is a complex and high-risk operation that involves digging underground mines to extract coal resources. During the mining process, gas, as a common byproduct, will penetrate through the coal layer into the mine. These gases contain toxic carbon monoxide, which poses a serious threat to the life and safety of miners. In addition, methane and other components in gas are very likely to cause fires and explosions when the concentration increases, posing a great challenge to the safety of mine operations.

[0003] Since the gas outflow in coal mines is usually large, it is difficult to effectively dilute and remove the gas by relying solely on the ventilation system. Therefore, the use of gas extraction technology has become a necessary measure. Gas extraction technology mainly extracts gas from coal seams or goafs to the ground through the coordinated work of drilling holes, tunnels, pipelines and vacuum pumps.

[0004] However, the extraction devices in the prior art have certain limitations when used. These devices usually require a vacuum pump to be connected to an exhaust pipe, which serves as a power source to extract gas from the inside of the mine through the exhaust pipe. During the gas transportation process, the filter tube and spray system inside the extraction device perform multiple filtrations on the gas. However, the existing atomizing nozzles often present a fixed-point spray pattern when spraying water mist, which limits the expansion of the spray coverage area, resulting in insufficient contact area between the water mist and the gas, affecting the uniform contact between the gas and the spray, thereby reducing the gas filtering effect. Summary of the invention

[0005] In view of this, the purpose of the present invention is to provide a coal mine underground gas circulation extraction device, which aims to effectively increase the coverage area of ​​water mist, improve the contact area and uniformity between gas and water mist, and thus improve the filtration quality and efficiency of gas by optimizing the design of the spray system.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A coal mine underground gas circulation extraction device comprises: a fan module, fixedly mounted on one side of a casing, comprising a first fan and a second fan; a motor drive module, fixedly mounted on the casing, comprising a motor and a rotating rod connected at a corresponding position thereto; a belt transmission module, fixedly connected to the rotating rod, comprising a driving pulley and a transmission belt, the driving pulley is driven to rotate by a gear connected to the transmission rod; a water mist spray module, comprising an atomizing nozzle, arranged in the casing via a guide moving module, the position of the atomizing nozzle in the casing being adjusted via the guide moving module; an air collecting box module, arranged on the bottom surface of the casing, and connected to the installation adjustment module via a round pipe.

[0008] Optionally, a water inlet pipe is fixedly connected to the box body at a position corresponding to the bottom end of the motor. The water inlet pipe passes through the outer wall of the box body and is fixedly connected to two telescopic tubes. Atomizing nozzles are fixedly connected to opposite sides of the telescopic tubes.

[0009] Optionally, a connection block is fixedly connected to the atomizing nozzle, and a pressure wheel is provided at the bottom end of the connection block, and the pressure wheel cooperates with the guide moving module.

[0010] Optionally, the guide moving module includes a guide frame fixedly connected to the box body, a symmetrically arranged moving block is slidably connected inside the guide frame, one end of the moving block is fixedly connected to a telescopic rod, the top of the telescopic rod is fixedly connected to a linkage frame, a transverse plate is fixedly connected to the position of the guide frame at the inside of the box body corresponding to the bottom end of the guide frame, the top of the transverse plate is fixedly connected to a symmetrically arranged mounting block, and the moving block is driven to slide in the guide frame by the movement of the linkage frame.

[0011] Optionally, an air collecting box is fixedly connected to the bottom end of the box body, symmetrically arranged circular tubes are fixedly connected to the side walls of the air collecting box, a mounting plate is slidably connected to the side walls of the box body near the bottom end, a rotating ring is rotatably connected to the middle position of the mounting plate, symmetrically arranged springs are fixedly connected inside the rotating ring, limiting blocks are slidably connected to corresponding spring positions on the rotating ring, a plurality of symmetrically arranged extrusion rods are fixedly connected to the side walls of the mounting plate, symmetrically arranged filter tubes are fixedly connected at the same horizontal position of the side walls of the mounting plate and the rotating ring, the air collecting box module is connected to the installation and adjustment module through the circular tube, the circular tube is fixedly connected to the side walls of the air collecting box, and the installation and adjustment module is connected to the box body through the filter tube.

[0012] Optionally, the cross-section of the moving block is T-shaped.

[0013] Optionally, a symmetrically arranged driven rod is rotatably connected to the box body at the same horizontal position as the rotating rod, and a driven pulley is fixedly connected to the driven rod at the position corresponding to the driving pulley. One end of the driven rod is fixedly connected to a transmission rod, and the top end of the transmission rod is circular and slidably connected to the linkage frame.

[0014] Optionally, the top end of the connecting block is fixedly connected to the bottom end of the telescopic rod output end, the L-shaped portion of the atomizing nozzle and the water inlet pipe are rigid tube bodies, and the telescopic tube is a flexible tube body.

[0015] Optionally, an extrusion groove is provided on the mounting block, the extrusion groove is V-shaped, the pressure wheels are located inside the extrusion groove at a middle position on the mounting block, and the springs are fixedly connected to the limit blocks.

[0016] Optionally, one end of the limit block is arc-shaped, the arc-shaped position of the limit block is in contact with the extrusion rod, the limit block is in contact with the inner wall of the box, one end of the rotating ring is fixedly connected to a rotating handle, one side of the filter tube is sleeved on a round tube, and a sealing layer is provided at the connection between the round tube and the filter tube and at the connection between the mounting plate and the box.

[0017] The beneficial effects of the present invention are:

[0018] The present invention achieves up-down and left-right reciprocating motion of the two atomizing nozzles during spraying by coordinated use of various components, thereby effectively expanding the coverage area of ​​the spray, increasing the contact area and contact uniformity between the water mist and the gas, and thus significantly improving the filtration quality and filtration efficiency of the gas.

[0019] The present invention realizes the coordinated operation of various components by rotating the rotating ring, so that the limit block no longer abuts against the filter box wall, which facilitates the removal and cleaning of the filter tube, thereby simplifying the operation process and improving the maintenance convenience of the equipment.

[0020] Other advantages, objectives and features of the present invention will be described in the following description to some extent, and to some extent, will be obvious to those skilled in the art based on the following examination and study, or can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be described in detail below in conjunction with the accompanying drawings, wherein:

[0022] Figure 1 The front view provided by the present invention;

[0023] Figure 2 A partial structural diagram of the box provided by the present invention;

[0024] Figure 3 The internal structure diagram of the box provided by the present invention;

[0025] Figure 4 A structural diagram of a box provided by the present invention with part of it cut away;

[0026] Figure 5 A structural diagram of the separation of the mounting plate and the box provided by the present invention;

[0027] Figure 6 The present invention provides Figure 5 The structure diagram at A is enlarged;

[0028] Figure 7 A diagram showing the separation structure of the limit block and the spring and the rotating ring provided by the present invention;

[0029] Figure 8 This is a specific structural diagram of the connection block provided by the present invention.

[0030] In the figure: 1. box body; 2. first fan; 3. second fan; 4. motor; 5. rotating rod; 6. driving pulley; 7. belt; 8. gear; 9. driven rod; 10. driven pulley; 11. transmission rod; 12. water inlet pipe; 13. telescopic pipe; 14. atomizing nozzle; 15. connecting block; 16. pressure wheel; 17. guide frame; 18. moving block; 19. telescopic rod; 20. linkage frame; 21. transverse plate; 22. mounting block; 23. extrusion groove; 24. air collecting box; 25. round tube; 26. mounting plate; 27. rotating ring; 28. spring; 29. ​​limit block; 30. extrusion rod; 31. filter tube; 32. partition; 33. rotating handle; 34. sealing layer. DETAILED DESCRIPTION

[0031] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments only illustrate the basic concept of the present invention in a schematic manner, and the following embodiments and features in the embodiments can be combined with each other without conflict.

[0032] Among them, the drawings are only used for illustrative explanations, and they only represent schematic diagrams rather than actual pictures, and should not be understood as limitations on the present invention. In order to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of actual products. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0033] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "front", "rear", etc. indicate the orientation or position relationship, they are based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0034] See also Figures 1 to 8 ,like Figure 1-Figure 8 As shown, the coal mine underground gas circulation extraction device described in the present invention comprises a box body 1, a first fan 2 and a second fan 3 are fixedly installed on one side of the box body 1, a motor 4 is fixedly installed on the box body 1, a symmetrically arranged rotating rod 5 is rotatably connected at a position corresponding to the motor 4 on the box body 1, a driving pulley 6 is fixedly connected to the rotating rod 5, a belt 7 is transmission-connected to the driving pulley 6, a gear 8 is fixedly connected to the rotating rod 5 at a position adjacent to the driving pulley 6, a symmetrically arranged driven rod 9 is rotatably connected at the same horizontal position as the rotating rod 5 on the box body 1, a driven pulley 10 is fixedly connected to the driven rod 9 at a position corresponding to the driving pulley 6, a transmission rod 11 is fixedly connected to one end of the driven rod 9, and a bottom position of the box body 1 corresponding to the motor 4 is fixedly connected to the driven rod 9. A water inlet pipe 12 is fixedly connected at the position, and the water inlet pipe 12 passes through the outer wall of the box body 1 and is fixedly connected to two telescopic pipes 13, and the opposite sides of the telescopic pipes 13 are fixedly connected to atomizing nozzles 14, and the atomizing nozzles 14 are fixedly connected to connecting blocks 15, and the bottom ends of the connecting blocks 15 are provided with pressure wheels 16, and a guide frame 17 is fixedly connected inside the box body 1, and a symmetrically arranged moving block 18 is slidably connected inside the guide frame 17, and one end of the moving block 18 is fixedly connected to a telescopic rod 19, and the top of the telescopic rod 19 is fixedly connected to a linkage frame 20, and a transverse plate 21 is fixedly connected to the bottom end of the guide frame 17 inside the box body 1, and a symmetrically arranged mounting block 22 is fixedly connected to the top of the transverse plate 21, and an extrusion groove 23 is provided on the mounting block 22;

[0035] An air collecting box 24 is fixedly connected to the bottom end of the box body 1, and a symmetrically arranged round tube 25 is fixedly connected to the side wall of the air collecting box 24. A mounting plate 26 is slidably connected to the side wall of the box body 1 near the bottom end, and a rotating ring 27 is rotatably connected to the middle position of the mounting plate 26. A symmetrically arranged spring 28 is fixedly connected inside the rotating ring 27, and a limiting block 29 is slidably connected to the corresponding position of the spring 28 on the rotating ring 27. A plurality of symmetrically arranged extrusion rods 30 are fixedly connected to the side wall of the mounting plate 26, and a symmetrically arranged filter tube 31 is fixedly connected to the side wall of the mounting plate 26 at the same horizontal position as the rotating ring 27.

[0036] There are two gears 8, one of which is meshed with the other gear 8, and the other end of the belt 7 is connected to the driven pulley 10 for transmission, so that one gear 8 is convenient for driving the other gear 8 to rotate, and the driving pulley 6 is convenient for driving the driven pulley 10 to rotate through the belt 7, and the output end of the motor 4 is fixedly connected to one end of one of the rotating rods 5, so that the motor 4 is convenient for driving one of the rotating rods 5 to rotate, and the specific shape of the moving block 18 is T-shaped, and the top round rod part of the transmission rod 11 is sliding. The connecting block 15 is connected to the inside of the linkage frame 20. When the transmission rod 11 rotates following the driven rod 9, it is convenient to squeeze the inner wall of the linkage frame 20, thereby driving the linkage frame 20 to move. The top of the connecting block 15 is fixedly connected to the bottom end of the output end of the telescopic rod 19. The L-shaped part of the atomizing nozzle 14 and the water inlet pipe 12 are hard tube bodies, and the telescopic tube 13 is a soft tube body. When the connecting block 15 rises or falls, it is convenient to drive the output end of the telescopic rod 19 to retract and extend. The specific shape of the extrusion groove 23 is a V-shaped setting, and the pressure wheel 16 is Located inside the extrusion groove 23 at the middle position on the mounting block 22, the pressure wheel 16 is convenient for completing the rising action through the driven extrusion of the extrusion groove 23 when moving. A partition 32 is fixedly connected to the inside of the box body 1. The outlet pipe of the first fan 2 passes through the side wall of the box body 1 and the partition 32 and is connected to the air collecting box 24 inside the box body 1. The first fan 2 is convenient for sending gas into the inside of the air collecting box 24 through the outlet pipe. The spring 28 is fixedly connected to the limit block 29. One end of the limit block 29 is set in an arc shape, and the arc position of the limit block 29 is connected to the extrusion The rod 30 is in contact, and the limit blocks 29 are in contact with the inner wall of the box body 1. One end of the rotating ring 27 is fixedly connected to a rotating handle 33. One side of the filter tube 31 is sleeved on the round tube 25. The connection between the round tube 25 and the filter tube 31 and the connection between the mounting plate 26 and the box body 1 are both provided with a sealing layer 34. The spring 28 is convenient for driving the limit block 29 to reset and move. The limit block 29 is in contact with the extrusion rod 30 so that the extrusion rod 30 can squeeze the limit block 29 to slide toward the inside of the rotating ring 27. The sealing layer 34 can prevent air leakage from occurring in the box body 1 and the air collecting box 24.

[0037] When in use, the exhaust pipe of the first fan 2 can be connected with the coal mine, and the bottom end of the exhaust pipe is located at the top position inside the coal mine, so that the first fan 2 can extract the gas inside the coal mine through the exhaust pipe. The gas supply pipe of the second fan 3 can be connected with the coal mine, and the bottom end of the gas supply pipe is located at the top position of the head of the staff inside the coal mine, so that the second fan 3 can input fresh air into the coal mine through the gas supply pipe. At this time, the first fan 2 and the second fan 3 are in working state at the same time, and the air density sent into the coal mine by the second fan 3 is less than that of the gas, so the air will flow downward in the coal mine, and the gas will gather in the top part of the coal mine. At this time, the exhaust pipe of the first fan 2 is in a negative pressure exhaust state, and the gas supply pipe of the second fan 3 is in a high-pressure air supply state. A pressure difference is formed, thereby forming a circulating airflow, which has the effect of increasing the gas extraction speed. The gas extracted by the first fan 2 will be sent to the interior of the air collecting box 24 through the exhaust pipe and the air outlet pipe, and then sent to the interior of the filter tube 31 through the air collecting box 24 and the two round tubes 25. It flows into the interior of the box body 1 through the filtration of the filter tube 31. At this time, water is transported to the interior of the telescopic tube 13 and the atomizing nozzle 14 through the water inlet pipe 12, and the water is converted into water mist through the atomizing nozzle 14 to slowly spray the interior of the box body 1. Then, the motor 4 is started, and the motor 4 will drive one of the rotating rods 5 to rotate, and one of the rotating rods 5 will drive the driving pulley 6 and the gear 8 to rotate, and the gear 8 will drive the other rotating rod 5 and the driving pulley 6 to rotate. At this time, both driving pulleys 6 are driven by the belts. The belt 7 drives the driven pulley 10 to rotate, and the driven pulley 10 will drive the driven rod 9 to rotate, and the driven rod 9 will drive the transmission rod 11 to rotate. The top round rod of the transmission rod 11 will squeeze the inner wall of the linkage frame 20. At this time, the inner wall of the linkage frame 20 will be squeezed and will move passively. At this time, the two linkage frames 20 move toward the middle direction at the same time, which will drive the telescopic rod 19 to move. The telescopic rod 19 will drive the moving block 18 to slide inside the guide frame 17. At the same time, the telescopic rod 19 will also drive the connecting block 15 to move. The connecting block 15 will drive the atomizing nozzle 14 and the pressure wheel 16 to move toward the middle direction, and the telescopic tube 13 will deform with the movement of the atomizing nozzle 14 to adapt to the movement of the atomizing nozzle 14. The movement of the pressure wheel 16 will be with the squeezing The inner wall of the pressure groove 23 abuts, and the abutment force of the movement of the pressure wheel 16 will make the inner wall of the extrusion groove 23 passively squeeze the pressure wheel 16. At this time, the pressure wheel 16 will also move upward in the process of moving toward the middle direction, and the upward movement of the pressure wheel 16 will also drive the atomizing nozzle 14 to move upward, and the upward movement of the atomizing nozzle 14 will drive the connecting block 15 to move upward, and the upward movement of the connecting block 15 will retract the output end of the telescopic rod 19 into the telescopic rod 19. When both pressure wheels 16 move out of the extrusion groove 23 in the middle position, they will move smoothly on the top of the mounting block 22, and then move to the inside of the extrusion groove 23 on the side of the mounting block 22 to complete the downward movement. The process is the same. When the transmission rod 11 rotates to a position opposite to the initial rotation angle,The linkage frame 20 will be driven to move back to the direction of the initial movement. At this time, the atomizing nozzle 14 will still move along. At this time, the atomizing nozzle 14 has completed the process of moving up and down and on both sides, so that the spray range of the atomizing nozzle 14 is effectively expanded, thereby increasing the contact area and uniformity of the water mist and the gas, thereby effectively improving the filtration quality and filtration efficiency of the gas;

[0038] When the filter tube 31 needs to be removed, the rotating ring 27 can be rotated by turning the handle 33. The rotating ring 27 will drive the two limit blocks 29 to rotate. The two limit blocks 29 will abut against the extrusion rod 30 during the following rotation. The force of the limit blocks 29 following the rotation will cause the extrusion rod 30 to passively squeeze the limit blocks 29. At this time, the limit blocks 29 will retract toward the inside of the rotating ring 27 during the following rotation. The retraction of the limit blocks 29 will squeeze and shrink the spring 28. When the rotating ring 27 has rotated ninety degrees, the limit blocks 29 no longer abut against the inner wall of the box body 1. At this time, the mounting plate 26 can be pulled away from the box body 1 by turning the handle 33. At this time, the mounting plate 26 will drive the filter tube 31 to move, so that the filter tube 31 and the round tube 25 complete the separation action. At this time, the filter tube 31 is disassembled, and the installation of the filter tube 31 is similar, so as to achieve the purpose of facilitating the disassembly of the filter tube 31 and facilitating the cleaning of the filter tube 31.

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution, which should be included in the scope of the claims of the present invention.

Claims

1. A gas circulation extraction device for underground coal mines, characterized in that: include: A fan module is fixedly mounted on one side of the box body (1), and comprises a first fan (2) and a second fan (3); A motor drive module is fixedly mounted on the box body (1), comprising a motor (4) and a rotating rod (5) connected at a corresponding position thereof; The belt transmission module is fixedly connected to the rotating rod (5), and comprises a driving pulley (6) and a transmission belt (7), and drives the driving pulley (6) to rotate via a gear (8) connected to the transmission rod (5); A water mist spray module, comprising an atomizing nozzle (14), which is arranged in the box (1) via a guide moving module, and the position of the atomizing nozzle (14) in the box (1) is adjusted via the guide moving module; The air collecting box module is arranged on the inner bottom surface of the box body (1) and is connected to the mounting regulating module via a round pipe.

2. The underground coal mine gas circulation extraction device according to claim 1, characterized in that: A water inlet pipe (12) is fixedly connected to the box body (1) at a position corresponding to the bottom end of the motor (4). The water inlet pipe (12) passes through the outer wall of the box body (1) and is fixedly connected to two telescopic pipes (13). Atomizing nozzles (14) are fixedly connected to the opposite sides of the telescopic pipes (13).

3. The underground coal mine gas circulation extraction device according to claim 2, characterized in that: The atomizing nozzles (14) are all fixedly connected with connecting blocks (15), and the bottom ends of the connecting blocks (15) are all provided with pressure wheels (16), and the pressure wheels (16) are matched with the guide moving modules.

4. The underground coal mine gas circulation extraction device according to claim 3, characterized in that: The guide moving module comprises a guide frame (17) fixedly connected to the inside of the box body (1), a symmetrically arranged moving block (18) is slidably connected to the inside of the guide frame (17), one end of the moving block (18) is fixedly connected to a telescopic rod (19), the top of the telescopic rod (19) is fixedly connected to a linkage frame (20), a transverse plate (21) is fixedly connected to the inside of the box body (1) at a position corresponding to the bottom end of the guide frame (17), the top of the transverse plate (21) is fixedly connected to a symmetrically arranged mounting block (22), and the moving block (18) is driven to slide in the guide frame (17) by the movement of the linkage frame (20).

5. The underground coal mine gas circulation extraction device according to claim 4, characterized in that: The bottom end of the box body (1) is fixedly connected to a gas collecting box (24), and the side wall of the gas collecting box (24) is fixedly connected to a symmetrically arranged circular tube (25). A mounting plate (26) is slidably connected to the side wall of the box body (1) near the bottom end. A rotating ring (27) is rotatably connected to the middle position of the mounting plate (26). A symmetrically arranged spring (28) is fixedly connected to the inside of the rotating ring (27), and a limiting block (29) is slidably connected to the corresponding position of the spring (28) on the rotating ring (27). A plurality of symmetrically arranged extrusion rods (30) are fixedly connected to the side wall of the mounting plate (26). A symmetrically arranged filter tube (31) is fixedly connected to the side wall of the mounting plate (26) at the same horizontal position as the rotating ring (27). The gas collecting box module is connected to the installation and adjustment module through the circular tube (25). The circular tube (25) is fixedly connected to the side wall of the gas collecting box (24), and the installation and adjustment module is connected to the box body (1) through the filter tube (31).

6. The underground coal mine gas circulation extraction device according to claim 4, characterized in that: The cross section of the moving block (18) is T-shaped.

7. The underground coal mine gas circulation extraction device according to claim 4, characterized in that: A driven rod (9) symmetrically arranged is rotatably connected at the same horizontal position as the rotating rod (5) on the box body (1), and a driven pulley (10) is fixedly connected to the driven rod (9) at a position corresponding to the driving pulley (6). A transmission rod (11) is fixedly connected to one end of the driven rod (9). The top end of the transmission rod (11) is circular and slidably connected to the linkage frame (20).

8. The underground coal mine gas circulation extraction device according to claim 4, characterized in that: The top end of the connection block (15) is fixedly connected to the bottom end of the output end of the telescopic rod (19); the L-shaped portion of the atomizing nozzle (14) and the water inlet pipe (12) are rigid pipe bodies; and the telescopic pipe (13) is a flexible pipe body.

9. The underground coal mine gas circulation extraction device according to claim 5, characterized in that: The mounting blocks (22) are each provided with an extrusion groove (23), the extrusion groove (23) being V-shaped, the pressure wheels (16) being each located inside the extrusion groove (23) at a middle position on the mounting blocks (22), and the springs (28) being each fixedly connected to the limit blocks (29).

10. The underground coal mine gas circulation extraction device according to claim 5, characterized in that: One end of the limit block (29) is arc-shaped, and the arc-shaped position of the limit block (29) is in contact with the extrusion rod (30). The limit block (29) is in contact with the inner wall of the box body (1). One end of the rotating ring (27) is fixedly connected to a rotating handle (33). One side of the filter tube (31) is sleeved on the round tube (25). The connection between the round tube (25) and the filter tube (31) and the connection between the mounting plate (26) and the box body (1) are both provided with a sealing layer (34).

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