Coal mine gas extraction device

Abstract

The utility model discloses a coal mine gas extraction device, include: installation pipe, air compressor and negative pressure air pump, installation pipe one end fixedly connected with installation fixed plate, installation pipe passes through installation fixed plate fixed mounting in the extraction channel, installation pipe with installation fixed plate one end outside sleeve has rubber rubber seal ring. The utility model discloses the cooperation of high pressure inlet pipe and air bag, utilize high pressure gas inflation air bag sealed extraction area, make negative pressure suction port only for local area carry out high -efficient extraction, enhance the suction of gas in small gap, simultaneously, electric telescopic link drive high pressure inlet pipe removes, realize sub -region continuous extraction, avoid the problem of suction dispersion because of coal seam gap is many. The design of rubber seal ring and check valve further ensures the leakproofness and gas one -way flow, thereby effectively promotes the thoroughness and security of gas extraction.

Description

Technical Field

[0001] This utility model relates to the field of gas extraction technology, specifically a coal mine gas extraction device. Background Technology

[0002] Methane gas is often generated in coal mines. If the methane gas is not completely extracted before mining operations, it will cause miners to inhale large amounts of methane gas, posing a significant threat to their health. Chinese Patent (Publication No.: CN109184781B) discloses a methane extraction device for coal mining areas, which includes an extraction component, a sealing component, an extraction pipe, and a porous internal support component. Multiple porous internal support components are arranged in a spaced array along the length of the extraction pipe. The extraction pipe extends into a extraction borehole in the coal seam to be extracted. The sealing component is located between the borehole opening and the extraction pipe. The extraction component is connected to the extraction pipe to extract methane gas from the borehole. A high-frequency oscillator is installed inside the internal support component.

[0003] However, existing coal mine gas extraction devices have some drawbacks in use, such as:

[0004] Most existing coal mine gas extraction devices involve drilling holes near the coal seam and then directly extracting gas from those holes using negative pressure equipment. However, if the entire borehole is extracted simultaneously, the suction force of the negative pressure equipment decreases due to the numerous gaps in the coal seam and the rapid air intake per unit time. This results in the inability to completely extract gas remaining in some small gaps. Therefore, a gas extraction device that can extract gas in different areas to enhance suction is needed. Utility Model Content

[0005] The purpose of this utility model is to provide a coal mine gas extraction device to solve the problem that most existing coal mine gas extraction devices directly extract gas from the borehole by drilling near the coal seam using a negative pressure device. However, if the entire borehole is extracted under negative pressure at the same time, the suction force of the negative pressure device on the air in the pores will be reduced due to the large number of gaps in the coal seam and the rapid air intake per unit time, resulting in the inability to completely extract the gas remaining in some small gaps.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A coal mine gas extraction device includes: an installation pipe, an air compressor, and a negative pressure air pump. One end of the installation pipe is fixedly connected to an installation plate, and the installation pipe is fixedly installed within an extraction channel via the installation plate. A rubber sealing ring is fitted around the end of the installation pipe connected to the installation plate to seal the connection between the installation pipe and the extraction channel. An air bladder is wrapped around the installation pipe, and the installation pipe is continuously connected to the air bladder. A high-pressure air outlet is formed on one side of the outer surface of the installation pipe adjacent to the air bladder, and a negative pressure air intake is formed on the other side of the outer surface of the installation pipe adjacent to the air bladder. A high-pressure air inlet pipe is installed inside the installation pipe. A sliding seal is formed between the high-pressure intake pipe and the mounting plate. One end of the high-pressure intake pipe is connected to a high-pressure outlet inside the mounting pipe. A first piston ring is sleeved on the outside of the connection between the high-pressure intake pipe and the high-pressure outlet. A rubber piston is provided on the other side of the high-pressure outlet. The high-pressure outlet corresponds to both the high-pressure outlet port and the air bladder. A high-pressure gas transmission pipe is connected to the end of the high-pressure intake pipe away from the high-pressure outlet. The other end of the high-pressure gas transmission pipe is connected to the gas output port of the air compressor. A negative pressure extraction mechanism is provided on the side of the mounting plate away from the mounting pipe. The negative pressure extraction mechanism is used to extract gas through the negative pressure intake port.

[0008] Furthermore, the negative pressure extraction mechanism includes a negative pressure suction pipe disposed on the inner wall of the high-pressure air inlet pipe. One end of the negative pressure suction pipe located inside the high-pressure air inlet pipe has a suction inlet. The suction inlet extends through the top of the high-pressure air inlet pipe and corresponds to the negative pressure suction port. The suction inlet is located on the side of the first piston ring away from the high-pressure outlet. A second piston ring is disposed on the side of the suction inlet away from the first piston ring, and the second piston ring is sleeved outside the high-pressure air inlet pipe. Both the negative pressure suction port and the suction inlet are disposed between the first piston ring and the second piston ring. A negative pressure air delivery pipe is connected to the end of the negative pressure suction pipe away from the suction inlet, and the other end of the negative pressure air delivery pipe is connected to the suction end of the negative pressure air pump.

[0009] Furthermore, a telescopic mounting plate is fixedly connected to the end of the high-pressure air inlet pipe away from the high-pressure air outlet. The high-pressure air supply pipe passes through the telescopic mounting plate and is connected to the high-pressure air inlet pipe. The negative pressure air supply pipe passes through the telescopic mounting plate and is connected to the negative pressure air intake pipe. The telescopic mounting plate and the mounting fixing plate are parallel to each other. Connecting seats are respectively provided at the four corners of the side of the mounting fixing plate near the telescopic mounting plate. Electric telescopic rods are fixedly installed at the four corners of one side of the telescopic mounting plate. The power output end of the electric telescopic rod is fixedly connected to the mounting fixing plate through the connecting seats. The electric telescopic rod drives the relative movement between the telescopic mounting plate and the mounting fixing plate, causing the high-pressure air inlet pipe to move in the mounting pipe.

[0010] Furthermore, a tail limiting baffle is provided at the end of the electric telescopic rod away from the telescopic mounting plate, and a middle limiting frame is provided in the middle of the electric telescopic rod. The tail limiting baffle and the middle limiting frame are used to limit the relative position between the electric telescopic rods, and handles are fixedly connected to the outer side walls of the middle limiting frame.

[0011] Furthermore, a one-way valve is installed inside the high-pressure intake pipe corresponding to the first piston ring. The one-way valve is used to prevent the gas inside the high-pressure outlet from flowing back into the high-pressure intake pipe.

[0012] Furthermore, a vent hole is provided at the end of the mounting tube away from the mounting plate, and the vent hole is used to ensure the air pressure balance on both sides of the rubber piston.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] This invention utilizes the combination of a high-pressure air intake pipe and an airbag to seal the extraction area by expanding the airbag with high-pressure gas. This allows the negative pressure suction port to efficiently extract gas only from a localized area, enhancing the suction force on gas in small gaps. Simultaneously, an electric telescopic rod drives the high-pressure air intake pipe to move, enabling continuous extraction in different areas and avoiding the problem of dispersed suction force caused by numerous coal seam gaps. The design of the rubber sealing ring and one-way valve further ensures sealing and unidirectional gas flow, thereby effectively improving the thoroughness and safety of gas extraction. Attached Figure Description

[0015] Figure 1 This is a top-view three-dimensional structural diagram of the product in one embodiment of the present utility model;

[0016] Figure 2 This utility model Figure 1 A three-dimensional structural diagram of the product viewed from below in the embodiment;

[0017] Figure 3 This utility model Figure 1 A schematic diagram of the front cross-sectional structure of the product in the embodiment;

[0018] Figure 4 This utility model Figure 1 A three-dimensional structural diagram of the high-pressure air intake pipe of the product in the embodiment.

[0019] Figure label:

[0020] 101. Mounting pipe; 109. Air compressor; 205. Negative pressure air pump; 110. Mounting plate; 300. Rubber sealing ring; 102. Airbag; 103. High-pressure air outlet; 104. Negative pressure air inlet; 105. High-pressure air inlet pipe; 111. High-pressure air outlet end; 107. First piston ring; 106. Rubber piston; 108. High-pressure air supply pipe; 201. Negative pressure air inlet pipe; 203. Air inlet; 202. Second piston ring; 204. Negative pressure air supply pipe; 401. Telescopic mounting plate; 403. Connecting seat; 402. Electric telescopic rod; 501. Tail limit baffle; 502. Middle limit bracket; 503. Handle; 600. One-way valve; 700. Vent hole. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Please refer to the following: Figures 1-4 ,in, Figure 1 This is a top-view three-dimensional structural diagram of the product in one embodiment of the present utility model; Figure 2 This utility model Figure 1 A three-dimensional structural diagram of the product viewed from below in the embodiment; Figure 3 This utility model Figure 1 A schematic diagram of the front cross-sectional structure of the product in the embodiment; Figure 4 This utility model Figure 1 A three-dimensional structural diagram of the high-pressure air intake pipe of the product in the embodiment.

[0023] A coal mine gas extraction device includes: an installation pipe 101, an air compressor 109, and a negative pressure air pump 205. One end of the installation pipe 101 is fixedly connected to an installation fixing plate 110, and the installation pipe 101 is fixedly installed in an extraction channel via the installation fixing plate 110. A rubber sealing ring 300 is fitted externally on the end of the installation pipe 101 connected to the installation fixing plate 110 to seal the connection between the installation pipe 101 and the extraction channel. An air bladder 102 is wrapped around the installation pipe 101, and the installation pipe 101 is continuously connected to the air bladder 102. A high-pressure air outlet 103 is provided on the outer surface of the installation pipe 101 on one side of the air bladder 102, and a negative pressure air intake 104 is provided on the outer surface of the installation pipe 101 on the other side of the air bladder 102. A high-pressure air inlet pipe 105 is installed inside the installation pipe 101. The high-pressure intake pipe 105 is slidably sealed with the mounting plate 110. One end of the high-pressure intake pipe 105 is connected to a high-pressure outlet 111 inside the mounting pipe 101. A first piston ring 107 is sleeved on the outside of the connection between the high-pressure intake pipe 105 and the high-pressure outlet 111. A rubber piston 106 is provided on the other side of the high-pressure outlet 111. The high-pressure outlet 111 is simultaneously provided with the high-pressure outlet 103 and the airbag 102. A high-pressure gas transmission pipe 108 is connected to the end of the high-pressure intake pipe 105 away from the high-pressure outlet 111. The other end of the high-pressure gas transmission pipe 108 is connected to the gas output end of the air compressor 109. A negative pressure extraction mechanism is provided on the side of the mounting plate 110 away from the mounting pipe 101. The negative pressure extraction mechanism is used to extract gas through the negative pressure intake port 104.

[0024] The mounting plate 110 has screw holes. In actual use, the mounting plate 110 can be fixed to the working surface using expansion screws, so that the installation pipe 101 is stably placed in the extraction channel.

[0025] When implementing this coal mine gas extraction device, special attention must be paid to the sealing performance between the installation pipe 101 and the extraction channel. While the rubber sealing ring 300 provides a preliminary seal, during actual installation, it is crucial to ensure the inner wall of the extraction channel opening is smooth and free of debris to prevent scratches on the rubber sealing ring 300 and subsequent seal failure. During installation, a suitable amount of lubricant can be applied to the surface of the rubber sealing ring 300 to reduce frictional resistance and facilitate the smooth entry of the installation pipe 101 into the extraction channel. Furthermore, the fixing screws of the mounting plate 110 should be tightened evenly to prevent uneven force from causing the installation pipe 101 to tilt, which would affect the subsequent expansion effect of the airbag 102. After installation, an airtightness test must be performed by briefly running the negative pressure air pump 205 to check for any air leakage between the rubber sealing ring 300 and the inner wall of the channel, ensuring the sealing effect meets design requirements.

[0026] The expansion control of the airbag 102 is one of the key aspects of the technical solution. The airbag 102 is connected to the high-pressure inlet pipe 105 via the high-pressure outlet 103. When the air compressor 109 starts, high-pressure gas enters the airbag 102 through the high-pressure gas delivery pipe 108, the high-pressure inlet pipe 105, and the high-pressure outlet 111, causing it to expand. In actual operation, the expansion pressure of the airbag 102 needs to be adjusted according to the diameter of the extraction channel to avoid rupture due to excessive pressure or ineffective sealing due to insufficient pressure. The design of the high-pressure outlet 103 should ensure uniform gas distribution, allowing the airbag 102 to expand symmetrically and fit tightly against the inner wall of the channel. Simultaneously, the material of the airbag 102 should possess high wear resistance and pressure resistance to adapt to the complex environment of underground coal mines. During long-term use, the integrity of the airbag 102 needs to be checked regularly; any wear or aging should be promptly addressed by replacement to ensure sealing performance and extraction efficiency.

[0027] Furthermore, the negative pressure extraction mechanism includes a negative pressure suction pipe 201, which is disposed on the inner wall of the high-pressure air inlet pipe 105. One end of the negative pressure suction pipe 201 inside the high-pressure air inlet pipe 105 has a suction inlet 203. The suction inlet 203 extends through the top of the high-pressure air inlet pipe 105 and corresponds to the negative pressure suction port 104. The suction inlet 203 is located on the side of the first piston ring 107 away from the high-pressure outlet end 111. A second piston ring 202 is provided on the side of the air intake 203 away from the first piston ring 107. The second piston ring 202 is sleeved on the outside of the high-pressure air intake pipe 105. The negative pressure air intake port 104 and the air intake 203 are both located between the first piston ring 107 and the second piston ring 202. The negative pressure air intake pipe 201 is connected to a negative pressure air delivery pipe 204 at one end away from the air intake 203. The other end of the negative pressure air delivery pipe 204 is connected to the air intake end of the negative pressure air pump 205.

[0028] When the installation pipe 101 is installed into the extraction channel, since the outer diameter of the rubber sealing ring 300 is slightly larger than the aperture of the extraction channel, the negative pressure air pump 205 can be turned on during installation to draw out the gas inside the extraction channel and generate negative pressure, thereby causing the rubber sealing ring 300 to be sucked into the extraction channel.

[0029] The operation of the negative pressure extraction mechanism requires precise control. The negative pressure suction pipe 201 corresponds to the negative pressure suction port 104 via the suction inlet 203. When the negative pressure air pump 205 starts, methane gas enters the negative pressure suction pipe 201 from the negative pressure suction port 104 and is then discharged through the negative pressure gas delivery pipe 204. In actual operation, it is necessary to ensure good sealing of the first piston ring 107 and the second piston ring 202 to prevent gas leakage from affecting the negative pressure effect. The position of the suction inlet 203 must correspond to the negative pressure suction port 104 to ensure efficient extraction of methane gas. Furthermore, the pumping rate of the negative pressure air pump 205 should be adjusted according to the distribution of coal seam fissures. For areas with many small fissures, the pumping rate can be appropriately reduced to enhance suction and ensure complete extraction of methane gas. Regularly cleaning the dust and impurities inside the negative pressure suction pipe 201 is also an important measure to maintain efficient extraction.

[0030] Furthermore, a telescopic mounting plate 401 is fixedly connected to the end of the high-pressure air inlet pipe 105 away from the high-pressure air outlet end 111. The high-pressure air supply pipe 108 passes through the telescopic mounting plate 401 and is connected to the high-pressure air inlet pipe 105. The negative pressure air supply pipe 204 passes through the telescopic mounting plate 401 and is connected to the negative pressure suction pipe 201. The telescopic mounting plate 401 and the mounting fixing plate 110 are parallel to each other. Connecting seats 403 are respectively provided at the four corners of the side of the mounting fixing plate 110 near the telescopic mounting plate 401. Electric telescopic rods 402 are fixedly installed at the four corners of the side of the telescopic mounting plate 401. The power output end of the electric telescopic rod 402 is fixedly connected to the mounting fixing plate 110 through the connecting seats 403. The electric telescopic rod 402 drives the relative movement between the telescopic mounting plate 401 and the mounting fixing plate 110, causing the high-pressure air inlet pipe 105 to move in the mounting pipe 101.

[0031] The movement control of the electric telescopic mast 402 is the core of achieving zoned sampling. The electric telescopic mast 402 drives the telescopic mounting plate 401 to move, causing the high-pressure air inlet pipe 105 to slide within the mounting pipe 101, thereby changing the positions of the high-pressure air outlet 103 and the negative pressure air intake port 104. In actual operation, the stroke of the electric telescopic mast 402 needs to be reasonably set according to the length of the sampling channel to ensure that the high-pressure air inlet pipe 105 can cover the entire sampling area. The design of the middle limiting frame 502 and the tail limiting baffle 501 is used to limit the movement range of the electric telescopic mast 402, avoiding equipment damage due to excessive stretching or compression. During operation, the position of the electric telescopic mast 402 can be manually adjusted using the handle 503, or a movement program can be preset in the automation system to achieve continuous zoned sampling. Regularly check the lubrication and electrical connections of the electric telescopic mast 402 to ensure its smooth and reliable operation.

[0032] Furthermore, a tail limiting baffle 501 is provided at the end of the electric telescopic rod 402 away from the telescopic mounting plate 401, and a middle limiting frame 502 is provided in the middle of the electric telescopic rod 402. The tail limiting baffle 501 and the middle limiting frame 502 are used to limit the relative position between the electric telescopic rods 402. A handle 503 is fixedly connected to the outer side wall of the middle limiting frame 502.

[0033] The air compressor 109 and the negative pressure air pump 205 can be integrated and installed on the telescopic mounting plate 401. The air compressor 109 and the negative pressure air pump 205 are limited by the tail limit baffle 501 and the middle limit frame 502, which makes it convenient for the user to quickly install the entire device inside the extraction channel using the handle 503. Of course, if the air compressor 109 and the negative pressure air pump 205 are too heavy, they can also be placed on the ground and connected by pipes to transport high-pressure gas and extract negative pressure.

[0034] The selection and installation of the air compressor 109 and negative pressure air pump 205 must be determined based on actual needs. If the air compressor 109 and negative pressure air pump 205 are integrated onto the telescopic mounting plate 401, it is necessary to ensure uniform weight distribution to avoid affecting the movement of the electric telescopic rod 402 due to instability of the center of gravity. For large equipment, it can be placed on the ground and connected to the device by extending the high-pressure air supply pipe 108 and the negative pressure air supply pipe 204 to reduce the load on moving parts. In actual operation, the sealing of the pipe connections should be checked regularly to prevent gas leakage. The output pressure of the air compressor 109 should be adjusted according to the expansion requirements of the air bladder 102, and the pumping capacity of the negative pressure air pump 205 should be matched with the coal seam gas content to ensure extraction efficiency. In addition, the noise and vibration of the equipment during operation must also be controlled within a reasonable range to reduce interference with underground operations.

[0035] Furthermore, a one-way valve 600 is installed inside the high-pressure air inlet pipe 105 corresponding to the first piston ring 107. The one-way valve 600 is used to prevent the gas inside the high-pressure air outlet 111 from flowing back into the high-pressure air inlet pipe 105. A vent hole 700 is opened at the end of the mounting pipe 101 away from the mounting plate 110. The vent hole 700 is used to ensure the air pressure balance on both sides of the rubber piston 106.

[0036] The design of the one-way valve 600 and the vent 700 is crucial to the stability of the device. The one-way valve 600 is installed inside the high-pressure inlet pipe 105 to prevent backflow of gas from the high-pressure outlet 111, ensuring that the air bladder 102 remains continuously inflated. In actual use, the opening and closing flexibility of the one-way valve 600 should be checked regularly to prevent failure due to impurities. The vent 700 is located at the end of the mounting pipe 101 away from the mounting plate 110, used to balance the air pressure on both sides of the rubber piston 106, preventing the rubber piston 106 from being unable to be pulled due to pressure difference. In dusty environments, a filter can be installed at the vent 700 to prevent impurities from entering the mounting pipe 101 and affecting equipment operation.

[0037] In summary, the coal mine gas extraction device provided by this utility model, during operation, firstly, fixes the installation pipe 101 inside the extraction channel using the mounting plate 110. During installation, ensure the inner wall of the extraction channel opening is smooth and free of debris, and apply lubricant to the surface of the rubber sealing ring 300 to reduce friction. After installation, briefly run the negative pressure air pump 205 to check the seal between the rubber sealing ring 300 and the inner wall of the channel, ensuring no air leakage. The negative pressure generated by the air pump 205 then tightly adheres the rubber sealing ring 300 into the extraction channel, completing the seal. After the rubber sealing ring 300 is fully inside the extraction channel, use expansion bolts to evenly fix the mounting plate 110 to the working surface to prevent the installation pipe 101 from tilting.

[0038] Next, the air compressor 109 is started, and high-pressure gas enters the high-pressure inlet pipe 105 through the high-pressure gas delivery pipe 108, and then exits from the high-pressure outlet 103 through the high-pressure outlet end 111, causing the airbag 102 to inflate. After inflating, the airbag 102 tightly adheres to the inner wall of the extraction channel, forming a localized sealed area. Simultaneously, the high-pressure air generated at the high-pressure outlet end 111 exits through the high-pressure outlet 103 and enters the space sealed by the airbag 102, which is located at the deepest point of the extraction channel. At this time, the negative pressure air pump 205 is started to draw air from the other side of the inflated airbag 102 through the negative pressure suction port 104. Since there is a positive pressure area and a negative pressure area on both sides of the inflated airbag 102, the air on the positive pressure area side will enter the negative pressure area through the gaps between the coal seams, thereby completely transferring and extracting the gas in the gaps. The high-pressure inlet pipe 105 is equipped with a one-way valve 600 to prevent high-pressure gas backflow and ensure that the airbag 102 continues to inflate.

[0039] Subsequently, the gas enters the negative pressure suction pipe 201 through the negative pressure suction port 104, and is then extracted and stored by the negative pressure air pump 205 through the negative pressure gas delivery pipe 204. The suction inlet 203 is correspondingly set with the negative pressure suction port 104 to ensure efficient extraction of gas. The sealing performance of the first piston ring 107 and the second piston ring 202 ensures the effectiveness of negative pressure extraction. For areas with many small gaps, the pumping speed of the negative pressure air pump 205 can be appropriately reduced to enhance suction.

[0040] When extraction needs to be performed in other areas, the electric telescopic boom 402 is activated. The electric telescopic boom 402 drives the telescopic mounting plate 401 to move, causing the high-pressure air inlet pipe 105 to slide within the mounting pipe 101. This changes the position of the high-pressure air outlet 111 and the corresponding high-pressure air outlet 103 and negative pressure air inlet 104, allowing the negative pressure air pump 205 to extract gas from the outermost coal seam. The middle limiting frame 502 and the tail limiting baffle 501 are mainly used to enhance the structural strength of the four electric telescopic booms 402, increasing their resistance to damage and preventing equipment damage. The entire device can be lifted using the handle 503, facilitating the insertion of the mounting pipe into the extraction channel.

[0041] Throughout the process, the vent 700 is used to balance the air pressure on both sides of the rubber piston 106, preventing the rubber piston 106 from becoming immobile due to pressure difference. The air compressor 109 and the negative pressure air pump 205 can be integrated onto the telescopic mounting plate 401 or placed on the ground, connected via pipelines, depending on actual needs. Regularly check the sealing of the one-way valve 600, air bladder 102, and pipelines to ensure long-term stable operation of the equipment.

[0042] Finally, after completing gas extraction in all areas, turn off the air compressor 109 and negative pressure air pump 205, and the air bag 102 gradually contracts. Remove the screws on the mounting plate 110 and remove the mounting pipe 101 from the extraction channel. Clean the equipment and check the wear of each component to prepare it for the next use.

[0043] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0044] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A coal mine gas extraction device, comprising: The installation pipe (101), air compressor (109), and negative pressure air pump (205) are characterized in that one end of the installation pipe (101) is fixedly connected to an installation fixing plate (110), the installation pipe (101) is fixedly installed in the extraction channel through the installation fixing plate (110), and a rubber sealing ring (300) is sleeved on the outside of the end of the installation pipe (101) connected to the installation fixing plate (110). The rubber sealing ring (300) is used to secure the installation pipe (101) to the outside of the installation pipe (101). The installation tube (101) is sealed to the extraction channel; an air bag (102) is wrapped around the installation tube (101), and the installation tube (101) is connected to the air bag (102). A high-pressure air outlet (103) is opened through the outer surface of the installation tube (101) on one side of the air bag (102), and a negative pressure air inlet (104) is opened through the outer surface of the installation tube (101) on the other side of the air bag (102). A high-pressure air inlet pipe (105) is installed inside the installation tube (101). The high-pressure air inlet pipe (105) and the mounting plate (110) are slidably sealed. One end of the high-pressure air inlet pipe (105) is located inside the mounting pipe (101) and is connected to a high-pressure air outlet (111). A first piston ring (107) is sleeved on the outside of the connection between the high-pressure air inlet pipe (105) and the high-pressure air outlet (111). A rubber piston (106) is provided on the other side of the high-pressure air outlet (111). The high-pressure air outlet (111) also corresponds to the high-pressure air outlet... The air inlet (103) and the air bag (102) are provided. The high-pressure air inlet pipe (105) is connected to a high-pressure air supply pipe (108) at one end away from the high-pressure air outlet (111). The other end of the high-pressure air supply pipe (108) is connected to the gas output end of the air compressor (109). A negative pressure extraction mechanism is provided on the side of the mounting plate (110) away from the mounting pipe (101). The negative pressure extraction mechanism is used to extract gas through the negative pressure air inlet (104).

2. The coal mine gas extraction device according to claim 1, characterized in that, The negative pressure extraction mechanism includes a negative pressure suction pipe (201), which is disposed on the inner wall of the high-pressure inlet pipe (105). One end of the negative pressure suction pipe (201) inside the high-pressure inlet pipe (105) has a suction inlet (203). The suction inlet (203) extends through the top of the high-pressure inlet pipe (105) and corresponds to the negative pressure suction port (104). The suction inlet (203) is located on the side of the first piston ring (107) away from the high-pressure outlet end (111). A second piston ring (202) is provided on the side of the inlet (203) away from the first piston ring (107). The second piston ring (202) is sleeved on the outside of the high-pressure air inlet pipe (105). The negative pressure air intake port (104) and the air intake port (203) are both located between the first piston ring (107) and the second piston ring (202). The negative pressure air intake pipe (201) is connected to a negative pressure air delivery pipe (204) at one end away from the air intake port (203). The other end of the negative pressure air delivery pipe (204) is connected to the air intake end of the negative pressure air pump (205).

3. A coal mine gas extraction device according to claim 2, characterized in that, The high-pressure air inlet pipe (105) is fixedly connected to a telescopic mounting plate (401) at the end away from the high-pressure air outlet (111). The high-pressure air delivery pipe (108) passes through the telescopic mounting plate (401) and is connected to the high-pressure air inlet pipe (105). The negative pressure air delivery pipe (204) passes through the telescopic mounting plate (401) and is connected to the negative pressure air intake pipe (201). The telescopic mounting plate (401) and the mounting fixing plate (110) are parallel to each other. The mounting fixing plate (110) is close to the telescopic mounting plate (401). 01) Connecting seats (403) are provided at the four corners of one side. Electric telescopic rods (402) are fixedly installed at the four corners of one side of the telescopic mounting plate (401). The power output end of the electric telescopic rod (402) is fixedly connected to the mounting plate (110) through the connecting seats (403). The electric telescopic rod (402) drives the relative movement between the telescopic mounting plate (401) and the mounting plate (110), so that the high-pressure air inlet pipe (105) moves in the mounting pipe (101).

4. A coal mine gas extraction device according to claim 3, characterized in that, The electric telescopic rod (402) is provided with a tail limiting baffle (501) at the end away from the telescopic mounting plate (401), and a middle limiting frame (502) is provided in the middle of the electric telescopic rod (402). The tail limiting baffle (501) and the middle limiting frame (502) are used to limit the relative position between the electric telescopic rods (402). The outer side wall of the middle limiting frame (502) is fixedly connected with a handle (503).

5. A coal mine gas extraction device according to claim 1, characterized in that, A one-way valve (600) is installed inside the high-pressure intake pipe (105) corresponding to the first piston ring (107). The one-way valve (600) is used to prevent the gas inside the high-pressure outlet (111) from flowing back into the high-pressure intake pipe (105).

6. A coal mine gas extraction device according to claim 1, characterized in that, The mounting tube (101) has a vent hole (700) at the end away from the mounting plate (110). The vent hole (700) is used to ensure the air pressure balance on both sides of the rubber piston (106).

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