Coal mine gas extraction device

Abstract

The invention relates to the technical field of gas extraction, and discloses a coal mine gas extraction device which comprises a bottom plate, a base is fixedly connected to the top face of the bottom plate, a gas temporary storage tank is fixedly connected to the base, and a plurality of rotating wheels are installed on the bottom face of the bottom plate; the extraction assembly comprises two mounting plates fixedly connected with the bottom plate, the two mounting plates are located on the side of the gas temporary storage tank, a supporting plate is mounted between the two mounting plates, an extraction pump is fixedly connected to the supporting plate, one end of the extraction pump communicates with the gas temporary storage tank, and the other end of the extraction pump communicates with an extraction pipe; the plugging assembly is located on the peripheral side of the extraction pipe; and the lifting assembly is located between the bottom plate and the supporting plate, and the lifting assembly is used for adjusting the height of the extraction pipe. The device is simple in structure, convenient to use, capable of improving the overall plugging performance and convenient to control.

Description

Technical Field

[0001] This invention relates to the field of gas extraction technology, and in particular to a coal mine gas extraction device. Background Technology

[0002] Gas drainage refers to drilling into coal seams and gas accumulation areas, connecting the boreholes to dedicated pipelines, and using drainage equipment to extract gas from the coal seams and goaf to the surface for utilization or discharge into the main return airflow. It is not only an important measure to reduce gas emissions during mining, prevent gas exceedances and accumulation, and prevent gas explosions and coal and gas outbursts, but it can also turn harm into benefit by developing and utilizing gas as a resource associated with coal. To a certain extent, it can also improve the utilization rate of coal resources and reduce the impact on the environment.

[0003] Existing gas extraction devices lack a sealing function, allowing surrounding air to easily enter the extraction hole, resulting in low extraction concentration. Some existing technologies install airbags at the end of the extraction pipe, requiring an air pump to control the airbag's state, making the gas extraction process more complex and cumbersome, and difficult to control. Therefore, a coal mine gas extraction device is proposed. Summary of the Invention

[0004] The purpose of this invention is to provide a coal mine gas extraction device, which aims to solve or improve at least one of the above-mentioned technical problems.

[0005] To achieve the above objectives, the present invention provides the following solution: The present invention provides a coal mine gas extraction device, comprising... A base plate, on the top surface of which a base is fixedly connected, and on the base a gas storage tank is fixedly connected, and several wheels are installed on the bottom surface of the base plate; The extraction assembly includes two mounting plates fixedly connected to the base plate. The two mounting plates are located on the side of the gas storage tank. A support plate is installed between the two mounting plates. An extraction pump is fixedly connected to the support plate. One end of the extraction pump is connected to the gas storage tank, and the other end of the extraction pump is connected to an extraction pipe. A plugging assembly located around the extraction tube; A lifting assembly is located between the base plate and the support plate, and the lifting assembly is used to adjust the height of the extraction tube.

[0006] Preferably, the blocking assembly includes a moving plate located around the extraction pipe and slidably connected to the extraction pipe. A blocking plate corresponding to the extraction hole is fixedly connected to the side of the moving plate. The extraction pipe slidably passes through the blocking plate. A rotating sleeve is fitted on the extraction pipe and threadedly connected to the extraction pipe. An adjusting plate is provided on the extraction pipe. The rotating sleeve passes through the adjusting plate and is rotatably connected to the adjusting plate. A plurality of limiting rods are fixedly connected to the side of the moving plate away from the blocking plate. The ends of the limiting rods slidably pass through the adjusting plate and are fixedly connected to limiting blocks. A plurality of compression springs are fixedly connected between the moving plate and the blocking plate. The compression springs are located around the limiting rods.

[0007] Preferably, the extraction tube is provided with a sealing assembly, the sealing assembly including an inflatable airbag fixedly installed on the periphery of the end of the extraction tube, a fixed seat fixedly connected to the side of the adjusting plate, the rotating sleeve passing through the fixed seat and rotatably connected to the fixed seat, a receiving groove provided in the fixed seat, the receiving groove being annular, an annular plate slidably connected in the receiving groove, a plurality of connecting columns fixedly connected between the moving plate and the annular plate, the connecting columns being slidably disposed through the side wall of the receiving groove, a flexible tube communicating between the side of the receiving groove away from the connecting columns and the inflatable airbag, the flexible tube passing through the side wall of the extraction tube.

[0008] Preferably, the end of the hose near the fixing seat is spiral-shaped.

[0009] Preferably, the support plate is slidably connected to the mounting plate, a first connecting pipe is fixedly installed on the extraction pump, and a second connecting pipe is connected to the top of the gas storage tank. The end of the first connecting pipe is slidably located within the vertical section of the second connecting pipe.

[0010] Preferably, the lifting assembly includes two rotatably connected connecting rods, one of which is rotatably connected to the support plate, and the other is rotatably connected to the top surface of the base plate. A push rod is rotatably connected at the connection point of the two connecting rods. A threaded rod is provided through the base and is threadedly connected to the base. One end of the threaded rod is rotatably connected to the push rod, and the other end of the threaded rod is fixedly connected to an adjusting nut.

[0011] Preferably, a sealing ring is installed between the moving plate and the extraction tube.

[0012] Preferably, the inflatable airbag is made of silicone rubber or polyurethane rubber.

[0013] Preferably, a sealing gasket is fixedly installed inside the sealing plate.

[0014] The present invention discloses the following technical effects: This invention utilizes a lifting assembly to move a support plate up and down between mounting plates, adjusting the height of the extraction pipe during insertion to ensure it is aligned with the extraction hole in complex road conditions. The sealing assembly seals the extraction hole during extraction, preventing external air from entering and gas from leaking out through the gap between the extraction pipe and the hole. Simultaneously, the sealing assembly automatically inflates the air bladder within the sealing component, achieving a seal on the extraction pipe end without additional control, further improving sealing performance. This invention features a simple structure, ease of use, and improved overall sealing performance, while also being easy to control. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the structure of the coal mine gas extraction device of the present invention; Figure 2 for Figure 1 A magnified view of part A in the image; Figure 3 for Figure 1 A magnified view of part B in the image; Figure 4 This is a schematic diagram of the filter component structure of the present invention.

[0017] Figure 5 This is a schematic diagram showing the positions of the inclined rod and the motion frame during the upward movement of the mounting ring in this invention; Figure 6 This is a schematic diagram showing the positions of the inclined rod and the motion frame during the downward movement of the mounting ring in this invention; The components include: 1. Base plate; 2. Base; 3. Gas storage tank; 4. Rotary wheel; 501. Mounting plate; 502. Support plate; 503. Extraction pump; 504. Extraction pipe; 505. First connecting pipe; 506. Second connecting pipe; 601. Moving plate; 602. Sealing plate; 603. Rotating sleeve; 604. Adjusting plate; 605. Limiting rod; 606. Compression spring; 701. Inflatable airbag; 702. Fixed base. 703. Receiving groove; 704. Annular plate; 705. Connecting column; 706. Hose; 801. Connecting rod; 802. Push rod; 803. Threaded rod; 804. Adjusting nut; 9. Opening; 10. Collection box; 11. Rotating shaft; 12. Rotating frame; 13. Mounting ring; 14. Filter screen; 15. Rotating rod; 16. Diagonal rod; 17. Gear; 18. Moving frame; 19. Baffle; 20. Return spring. Detailed Implementation

[0018] 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.

[0019] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0020] Reference Figures 1-6 This invention provides a coal mine gas extraction device, comprising: A base plate 1 is fixedly connected to a base 2 on the top surface of the base plate 1. A gas storage tank 3 is fixedly connected to the base 2. Several wheels 4 are installed on the bottom surface of the base plate 1. The extraction assembly includes two mounting plates 501 fixedly connected to the base plate 1. The two mounting plates 501 are located on the side of the gas storage tank 3. A support plate 502 is installed between the two mounting plates 501. An extraction pump 503 is fixedly connected to the support plate 502. One end of the extraction pump 503 is connected to the gas storage tank 3, and the other end of the extraction pump 503 is connected to an extraction pipe 504. The plugging assembly is located on the periphery of the extraction pipe 504. The lifting assembly is located between the base plate 1 and the support plate 502. The lifting assembly is used to adjust the height of the extraction pipe 504.

[0021] The lifting assembly drives the support plate 502 to move up and down between the mounting plates 501, which can adjust the height of the extraction pipe 504 during insertion, ensuring that the extraction pipe 504 is aligned with the extraction hole in the complex road surface of the well. The sealing assembly can seal the extraction hole during the extraction process, ensuring that external air does not enter the hole and that gas inside the hole does not leak out from the gap between the extraction pipe 504 and the extraction hole. At the same time, the sealing assembly can also drive the inflation bladder 701 in the sealing assembly to open during operation, so that it can automatically inflate during operation without additional control, thereby sealing the end of the extraction pipe 504 and further improving the sealing performance.

[0022] The scheme was further optimized by installing a one-way valve in the horizontal section of the extraction pipe 504 to prevent gas backflow.

[0023] The scheme is further optimized. The blocking component includes a moving plate 601 located around the extraction pipe 504 and slidably connected to the extraction pipe 504. A blocking plate 602 corresponding to the extraction hole is fixedly connected to the side of the moving plate 601. The extraction pipe 504 is slidably connected through the blocking plate 602. A rotating sleeve 603 is sleeved on the extraction pipe 504 and threadedly connected to the extraction pipe 504. An adjusting plate 604 is provided on the extraction pipe 504. The rotating sleeve 603 passes through the adjusting plate 604 and is rotatably connected to the adjusting plate 604. Several limiting rods 605 are fixedly connected to the side of the moving plate 601 away from the blocking plate 602. The end of the limiting rod 605 slides through the adjusting plate 604 and is fixedly connected to a limiting block. Several compression springs 606 are fixedly connected between the moving plate 601 and the blocking plate 602. The compression springs 606 are located around the limiting rods 605. During the insertion of the extraction tube 504, the sealing plate 602 first contacts the outer wall at the opening of the extraction hole. As the extraction tube 504 continues to penetrate deeper, the sealing plate 602 compresses the compression spring 606. The reaction force of the compression spring 606 tightly adheres to the outer wall at the opening of the extraction hole, achieving sealing. The rotating sleeve 603 is threadedly engaged with the extraction tube 504. Rotation of the rotating sleeve 603 adjusts its lateral position, thereby changing the relative position between the sealing plate 602 and the end of the extraction tube 504, thus adjusting according to the insertion depth of the extraction tube 504.

[0024] The scheme is further optimized by installing a sealing assembly on the extraction pipe 504. The sealing assembly includes an inflatable airbag 701 fixedly installed on the periphery of the end of the extraction pipe 504. A fixed seat 702 is fixedly connected to the side of the adjusting plate 604. A rotating sleeve 603 passes through the fixed seat 702 and is rotatably connected to the fixed seat 702. A receiving groove 703 is opened in the fixed seat 702. The receiving groove 703 is annular. An annular plate 704 is slidably connected in the receiving groove 703. Several connecting columns 705 are fixedly connected between the moving plate 601 and the annular plate 704. The connecting columns 705 are slidably installed through the side wall of the receiving groove 703. A hose 706 is connected between the side of the receiving groove 703 away from the connecting columns 705 and the inflatable airbag 701. The hose 706 passes through the side wall of the extraction pipe 504. During the process of inserting the extraction pipe 504 to achieve the sealing function, the sealing plate 602 moves close to the rotating sleeve 603, thereby pushing the annular plate 704 to move through the connecting column 705. The annular plate 704 compresses the air into the inflatable airbag 701, causing the inflatable airbag 701 to inflate and achieve a seal at the end of the extraction pipe 504, further increasing the sealing performance and preventing external air from entering and internal gas from leaking.

[0025] The design is further optimized so that the end of the hose 706 near the fixed base 702 is spiral-shaped. This ensures that the hose 706 remains connected while the moving sleeve 603 drives the moving plate 601 and the sealing plate 602.

[0026] In a further optimized design, the support plate 502 is slidably connected to the mounting plate 501, a first connecting pipe 505 is fixedly installed on the extraction pump 503, and a second connecting pipe 506 is connected to the top of the gas storage tank 3. The end of the first connecting pipe 505 is slidably located within the vertical section of the second connecting pipe 506.

[0027] The scheme is further optimized. The lifting assembly includes two rotatably connected connecting rods 801. One connecting rod 801 is rotatably connected to the support plate 502, and the other connecting rod 801 is rotatably connected to the top surface of the base plate 1. A push rod 802 is rotatably connected at the connection point of the two connecting rods 801. A threaded rod 803 is threaded through the base 2 and threadedly connected to the base 2. One end of the threaded rod 803 is rotatably connected to the push rod 802, and the other end of the threaded rod 803 is fixedly connected to an adjusting nut 804. By adjusting the nut 804, the threaded rod 803 is rotated, which in turn drives the push rod 802 to move. During the movement, the push rod 802 pushes the two connecting rods 801 to move, causing an angle change between the two connecting rods 801. This, in turn, lifts the extraction pump 503 through the support plate 502, thereby adjusting the height of the extraction pipe 504 so that it is aligned with the extraction hole, facilitating the insertion of the extraction pipe 504.

[0028] The design was further optimized by installing a sealing ring between the moving plate 601 and the extraction pipe 504. This improves the sealing performance between the moving plate 601 and the extraction pipe 504, preventing gas leakage.

[0029] Further optimization of the design: the inflatable airbag 701 is made of silicone rubber or polyurethane rubber. Using special rubber materials such as silicone rubber or polyurethane rubber provides wear resistance, antistatic properties, and flame retardancy, making it suitable for underground coal mine environments. It can be repeatedly inflated and reused, and can withstand high temperatures (-60 degrees Celsius to 250 degrees Celsius), enabling long-term sealing of gas.

[0030] The design was further optimized by incorporating a sealing gasket within the sealing plate 602. This provides elasticity to the sides of the sealing plate 602, allowing for better contact with the outer wall of the extraction hole opening and ensuring sealing performance.

[0031] Further optimization of the scheme also includes a filter assembly. The filter assembly includes an opening 9 located at the end of the horizontal section of the extraction pipe 504 near the extraction pump 503. A collection box 10 is fixedly connected to one side of the extraction pipe 504. The collection box 10 is an open-top box. A rotating shaft 11 is rotatably connected inside the collection box 10. A rotating frame 12 is fixedly connected to the rotating shaft 11. Several mounting rings 13 are fixedly connected to the circumference of the rotating frame 12. The mounting rings 13 are adapted to the diameter of the extraction pipe 504. A filter screen 14 is fixedly connected inside the mounting ring 13. Any mounting ring 13 is located inside the opening 9 and connected to the extraction pipe 504. That is, when the mounting ring 13 moves to the opening 9 and connects to the extraction pipe 504, it ensures that the gas will not leak from the opening 9. The filter screen 14 is used to filter the gas drawn in, preventing particulate matter from moving into the pipeline or the gas storage tank 3.

[0032] In a further optimized design, several pairs of rotating rods 15 are rotatably connected through the side wall of the collection box 10. Each pair of rotating rods 15 is correspondingly set with any mounting ring 13 and located on both sides of the mounting ring 13. An inclined rod 16 is fixedly connected to the end of the rotating rod 15. The inclined rod 16 is inclined along the rotation direction of the mounting ring 13. A gear 17 is fixedly connected to the other end of the rotating rod 15. A motion frame 18 is slidably connected to the outer wall of the collection box 10. A rack that matches the gear 17 is provided on the inner wall of the motion frame 18. A baffle 19 is fixedly connected to the outer wall of the collection box 10. A return spring 20 is fixedly connected between the baffle 19 and the motion frame 18. The baffle 19 and the return spring 20 are located on the side of the motion frame 18 opposite to the rotation direction of the mounting ring 13. A control motor that controls the intermittent rotation of the rotating shaft 11 is fixedly installed on the outer wall of the collection box 10. The rotating shaft 11 is periodically driven by a control motor, which in turn drives the rotating frame 12 to rotate several mounting rings 13. This causes the filter screen 14, which is covered with adhering particles, to move out from the opening 9. As the filter screen 14 passes through the two inclined rods 16, the frame of the mounting rings 13 and the mesh of the filter screen 14 press against the inclined rods 16. This causes the inclined rods 16 to drive the rotating rod 15 to rotate, which in turn drives the gear 17 to rotate. This, in turn, drives the moving frame 18 to move through the rack. The moving frame 18 then returns to its initial position under the action of the return spring 20. The gear 17 then drives the rotating rod 15 to rotate back, which in turn drives the inclined rods 16 to return to their initial position. As the mounting rings 13 and the filter screen 14 rotate, they continuously press against the inclined rods 16. The inclined rods 16 continuously return to their original position, causing them to collide with the filter screen 14. This causes the dust particles and other debris adhering to the filter screen 14 to fall into the collection box 10 for centralized processing.

[0033] To further optimize the design, a collection port is provided at the bottom of the collection box 10, making it easy to remove debris from the collection box 10.

[0034] For details on the installation positions of the diagonal brace 16, the motion frame 18, and the baffle 19, please refer to [link / reference]. Figure 5 as well as Figure 6 .by Figure 5 For example, when the mounting ring 13 passes through the inclined rod 16 and moves upward, the inclined rod 16 is tilted upward, and the baffle 19 ( Figure 5 (Not shown in the image) Located below the motion frame 18, during the upward movement of the mounting ring 13, the mounting ring 13 and the mesh of the filter screen 14 continuously push and squeeze the inclined rod 16. The inclined rod 16 drives the motion frame 18 downward through the gear 17, squeezing the return spring 20. At the same time, the motion frame 18 will move upward under the action of the return spring 20, and through the gear 17, it will drive the inclined rod 16 to move closer to the filter screen 14. This ensures that during the movement, the mounting ring 13 continuously pushes and squeezes the inclined rod 16, and the inclined rod 16 continuously approaches and hits the filter screen 14, thus ensuring that the dust particles on the filter screen 14 fall into the collection box 10. Figure 6Similarly, when the mounting ring 13 moves downward, the diagonal rod 16 is tilted downward, and the baffle 19 ( Figure 6 (Not shown in the text) Located above the motion frame 18, the mounting ring 13 will also continuously squeeze the inclined rod 16 during the movement process, and the inclined rod 16 will continuously hit the filter screen 14 during the process of the return spring 20.

[0035] The working process of this invention is as follows: In use, the entire extraction device is pushed to the designated position. Then, by rotating the adjusting nut 804, the threaded rod 803 is rotated, which in turn drives the push rod 802 to move. During this movement, the push rod 802 pushes the two connecting rods 801 to change their angle, thereby lifting the support plate 502 and the extraction pump 503, thus adjusting the height of the extraction pipe 504 so that it is aligned with the extraction hole for easy insertion. During insertion, the sealing plate 602 first contacts the outer wall of the extraction hole opening. As it continues to enter, the sealing plate 602 compresses the compression spring 606. The reaction force of the compression spring 606 seals the extraction hole opening with the sealing plate 602. Simultaneously, during the compression of the spring 606 by the sealing plate 602, the sealing plate 602 and the extraction pipe 504 move relative to each other. This movement is achieved by the connecting column 705 pushing the annular plate 704, causing the annular plate 704 to compress the air inside the receiving groove 703. This air is then forced through the hose 706 into the inflation bladder 701, causing the inflation bladder 701 to inflate and seal the end of the extraction pipe 504. When the insertion depth of the extraction pipe 504 needs to be adjusted, only the rotating sleeve 603 needs to be rotated. The rotating sleeve 603 moves laterally under the action of the threads, thereby driving the adjusting plate 604 and the moving plate 601 to move, thus achieving position adjustment.

[0036] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0037] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. For those skilled in the art, other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A coal mine gas extraction device, characterized in that... :include A base plate (1) is fixedly connected to a base (2) on its top surface. A gas storage tank (3) is fixedly connected to the base (2). Several wheels (4) are installed on the bottom surface of the base plate (1). The extraction assembly includes two mounting plates (501) fixedly connected to the base plate (1). The two mounting plates (501) are located on the side of the gas storage tank (3). A support plate (502) is installed between the two mounting plates (501). An extraction pump (503) is fixedly connected to the support plate (502). One end of the extraction pump (503) is connected to the gas storage tank (3), and the other end of the extraction pump (503) is connected to an extraction pipe (504). A plugging assembly located around the extraction tube (504); A lifting assembly is located between the base plate (1) and the support plate (502), and the lifting assembly is used to adjust the height of the extraction pipe (504).

2. The coal mine gas extraction device according to claim 1, characterized in that: The sealing assembly includes a moving plate (601) located around the extraction pipe (504) and slidably connected to the extraction pipe (504). A sealing plate (602) corresponding to the extraction hole is fixedly connected to the side of the moving plate (601). The extraction pipe (504) is slidably connected through the sealing plate (602). A rotating sleeve (603) is sleeved on the extraction pipe (504) and threadedly connected to the extraction pipe (504). An adjusting plate (604) is provided on the extraction pipe (504). The rotating sleeve (603) passes through the adjusting plate (604) and is rotatably connected to the adjusting plate (604). A plurality of limiting rods (605) are fixedly connected to the side of the moving plate (601) away from the sealing plate (602). The end of the limiting rod (605) slides through the adjusting plate (604) and is fixedly connected to a limiting block. A plurality of compression springs (606) are fixedly connected between the moving plate (601) and the sealing plate (602). The compression springs (606) are located around the limiting rods (605).

3. The coal mine gas extraction device according to claim 2, characterized in that: A sealing assembly is provided on the extraction pipe (504). The sealing assembly includes an inflatable airbag (701) fixedly installed on the periphery of the end of the extraction pipe (504). A fixing seat (702) is fixedly connected to the side of the adjusting plate (604). The rotating sleeve (603) passes through the fixing seat (702) and is rotatably connected to the fixing seat (702). A receiving groove (703) is provided in the fixing seat (702). The receiving groove (703) is annular. An annular plate (704) is slidably connected inside the groove (703). Several connecting columns (705) are fixedly connected between the moving plate (601) and the annular plate (704). The connecting columns (705) are slidably connected through the side wall of the receiving groove (703). A hose (706) is connected between the side of the receiving groove (703) away from the connecting column (705) and the inflatable airbag (701). The hose (706) passes through the side wall of the extraction tube (504).

4. The coal mine gas extraction device according to claim 3, characterized in that: The end of the hose (706) near the fixed base (702) is spiral-shaped.

5. The coal mine gas extraction device according to claim 1, characterized in that: The support plate (502) is slidably connected to the mounting plate (501), a first connecting pipe (505) is fixedly installed on the extraction pump (503), and a second connecting pipe (506) is connected to the top of the gas storage tank (3). The end of the first connecting pipe (505) is slidably located in the vertical section of the second connecting pipe (506).

6. The coal mine gas extraction device according to claim 5, characterized in that: The lifting assembly includes two rotatably connected connecting rods (801), one of which is rotatably connected to the support plate (502), and the other is rotatably connected to the top surface of the base plate (1). A push rod (802) is rotatably connected at the connection point of the two connecting rods (801). A threaded rod (803) is provided through the base (2). The threaded rod (803) is threadedly connected to the base (2). One end of the threaded rod (803) is rotatably connected to the push rod (802), and the other end of the threaded rod (803) is fixedly connected to an adjusting nut (804).

7. The coal mine gas extraction device according to claim 2, characterized in that: A sealing ring is installed between the moving plate (601) and the extraction tube (504).

8. The coal mine gas extraction device according to claim 3, characterized in that: The inflatable airbag (701) is made of silicone rubber or polyurethane rubber.

9. The coal mine gas extraction device according to claim 2, characterized in that: A sealing gasket is fixedly installed inside the sealing plate (602).

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