A downhole gas extraction pipe

Abstract

This invention discloses a gas extraction pipeline technology, specifically an underground gas extraction pipeline, comprising an installation plate, with hydraulic cylinders installed in the middle of both sides of the upper surface of the installation plate. An extraction pipe is slidably installed on the inner side of the fixed cylinder in the vertical direction. A filter is installed at the lower end of the inner annular surface of the extraction pipe. A matching airbag is fixed on the inner side of the protective pad. A connected external threaded pipe is fixed on the upper surface of the extraction pipe, and a connected extraction pump is installed at the upper end of the external threaded pipe. This invention helps to seal the borehole at the underground gas extraction location with the fixed cylinder, preventing gas leakage from the borehole at the extraction location, thus preventing environmental impact and safety risks to workers due to gas leakage.

Description

Technical Field

[0001] This invention relates to the field of extraction pipeline technology, specifically to an underground gas extraction pipeline. Background Technology

[0002] Gas is formed from the decomposition of cellulose and organic matter by anaerobic bacteria during the early stages of coal formation from ancient plants. In the coal mining industry, gas is generally referred to as a general term for toxic and harmful gases, mainly methane. The main component of underground gas is methane, which is a mixed gas released from coal seams, rock strata, and goafs during the underground mining process.

[0003] Underground gas extraction refers to the process of extracting methane gas from coal seams or goaf areas in underground coal mines using specialized equipment and techniques, and transporting it to the surface or other safe locations for treatment. When extracting underground gas, it is necessary to first drill holes at the extraction location, and then use extraction pumps and extraction pipelines to extract the underground gas.

[0004] However, when existing extraction pipelines are in use, the sealing between the borehole at the underground gas extraction location and the extraction pipeline cannot be guaranteed, which can easily lead to gas leakage in the borehole at the gas extraction location. Gas leakage will not only affect the environment, but also the safety of the workers.

[0005] Therefore, we propose an underground gas extraction pipeline. Summary of the Invention

[0006] In view of the problems existing in the above and / or existing underground gas extraction pipelines, the present invention is proposed.

[0007] Therefore, the purpose of this invention is to provide an underground gas extraction pipeline. By improving the existing extraction pipeline, the problem that the sealing between the borehole and the extraction pipeline at the underground gas extraction location cannot be guaranteed in the prior art, which easily leads to gas leakage in the borehole at the gas extraction location, and gas leakage will affect the environment and the safety of workers.

[0008] To address the aforementioned technical problems, according to one aspect of the present invention, the present invention provides the following technical solution:

[0009] An underground gas extraction pipeline includes an installation plate with a placement hole in the middle. Hydraulic cylinders are installed in the middle of both sides of the upper surface of the installation plate. The output rods of the hydraulic cylinders face upwards and are fitted with first connecting plates. A fixing ring is fixed between adjacent sides of the first connecting plates. A fixing cylinder is fixed to the inner ring surface of the fixing ring. An extraction pipe is slidably installed on the inner side of the fixing cylinder in a vertical direction. A filter is installed at the lower end of the inner ring surface of the extraction pipe. A protective pad is fixed to the outer side of the outer ring surface of the fixing cylinder, located below the fixing ring. A matching airbag is fixed to the inner side of the protective pad. A connected external threaded pipe is fixed to the upper surface of the extraction pipe, and a connected extraction pump is installed at the upper end of the external threaded pipe.

[0010] As a preferred embodiment of the underground gas extraction pipeline of the present invention, wherein: a first connecting pipe communicating with the inside of the airbag is installed on the top of one side of the outer ring surface of the protective pad; a second connecting pipe communicating with the inside of the airbag is installed on the top of the side of the outer ring surface of the protective pad away from the first connecting pipe; second connecting plates are fixed on both sides of the outer ring surface of the fixing ring corresponding to the first connecting pipe and the second connecting pipe, respectively; the end of the first connecting pipe away from the protective pad passes through the upper and lower surfaces of the corresponding positions on the second connecting plate; an air pump is installed at the end of the first connecting pipe away from the protective pad; the first connecting pipe can connect the air pump and the inside of the airbag; the end of the second connecting pipe away from the protective pad passes through the upper and lower surfaces of the corresponding positions on the second connecting plate; and a solenoid valve is installed at the end of the second connecting pipe away from the protective pad.

[0011] As a preferred embodiment of the underground gas extraction pipeline of the present invention, wherein: a fixing rod is fixed to the center of each of the four sides of the upper surface of the fixing ring, the fixing rods are all in a vertical state, a limit ring is fixed together between the upper surfaces of the fixing rods, the fixing rods can fix and limit the limit ring, a rotating ring is rotatably installed on the inner side of the inner ring surface of the limit ring through a bearing, the external threaded pipe is in a vertical state, the external threaded pipe passes through the top and bottom of the inner side of the rotating ring, and the outer side of the external threaded pipe is threadedly connected to the inner side of the rotating ring.

[0012] As a preferred embodiment of the underground gas extraction pipeline of the present invention, wherein: an external gear ring is fixed at the top of the outer ring surface of the rotating ring above the limiting ring, a rotating motor is installed in the middle of the upper surface of the first connecting plate on one side, the output shaft of the rotating motor faces upward, and a matching gear is installed on the outer side of the upper end of the outer ring surface of the rotating motor output shaft corresponding to the external gear ring, so that the rotating motor can drive the gear to rotate, and the gear and the side of the external gear ring that are close to each other are in a matching meshing state.

[0013] As a preferred embodiment of the underground gas extraction pipeline described in this invention, the gas outlet of the extraction pump faces upward and is connected to a conveying pipe. The conveying pipe is vertical, and the upper end of the conveying pipe is connected to external equipment for storing gas. The extraction pump facilitates the extraction of gas.

[0014] As a preferred embodiment of the underground gas extraction pipeline of the present invention, the second connecting plate is in a horizontal state, and a limit rod is fixed in the middle of the side of the lower surface of the second connecting plate away from the fixed ring. The second connecting plate can fix and limit the limit rod. The limit rod is in a vertical state, and a limit cylinder is slidably sleeved on the outer side of the outer ring surface of the limit rod in the vertical direction.

[0015] As a preferred embodiment of the underground gas extraction pipeline of the present invention, the limiting cylinders are all vertical, the inner ring surface of the limiting cylinders are matched and fitted with the outer ring surface of the corresponding limiting rod, the lower end surface of the limiting cylinders are fixedly connected with the corresponding position on the upper surface of the corresponding mounting plate, and the mounting plate can fix and limit the limiting cylinders.

[0016] As a preferred embodiment of the underground gas extraction pipeline of the present invention, the inner annular surface of the airbag and the protective pad corresponding to the first through pipe is provided with matching grooves, and the inner annular surface of the airbag and the protective pad corresponding to the second through pipe is provided with matching grooves, and the second through pipe helps to discharge the gas in the airbag.

[0017] As a preferred embodiment of the underground gas extraction pipeline of the present invention, the extraction pipe is in a vertical state, and there are locking blocks fixed around the outer ring surface of the extraction pipe. The inner ring surface of the fixed cylinder is provided with matching slots corresponding to the locking blocks. The locking blocks are slidably connected with the corresponding slots on the fixed cylinder in the vertical direction. The slots and locking blocks help to limit the movement between the fixed cylinder and the extraction pipe.

[0018] As a preferred embodiment of the underground gas extraction pipeline of the present invention, the retention hole penetrates the upper and lower surfaces of the middle part of the mounting plate, and bolts are threaded into the four corners of the mounting plate in the vertical direction. The bolts are all vertical and penetrate the upper and lower surfaces of the corresponding positions on the mounting plate. The bolts help to install and limit the mounting plate.

[0019] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0020] 1. In this invention, the enlarged airbag and protective pad will compress and seal the borehole where gas extraction is required and the fixed cylinder. When in use, it helps to seal the borehole at the gas extraction location and the fixed cylinder, which can prevent gas leakage from the borehole at the gas extraction location, thus preventing environmental impact and safety risks to workers caused by gas leakage.

[0021] 2. In this invention, the airbag can be inflated by the air pump and the first connecting pipe, and the airbag can be vented by the solenoid valve and the second connecting pipe, so as to adjust the size of the airbag and the protective pad. The protective pad can protect the outside of the airbag and prevent the airbag from being damaged. When the rotating ring rotates, the external threaded pipe that is threaded to the rotating ring will move in the vertical direction. When the external threaded pipe moves, it can drive the extraction pipe to move in the vertical direction.

[0022] 3. In this invention, the output rod of the hydraulic cylinder can drive the first connecting plate to move in the vertical direction. When the first connecting plate moves, it can drive the second connecting plate and the fixed cylinder to move in the vertical direction through the fixed ring. When the second connecting plate moves, it can drive the limiting rod to move in the vertical direction along the inner side of the corresponding limiting cylinder. The mounting plate can limit the fixed ring through the limiting cylinder, the limiting rod and the second connecting plate, which helps to move the fixed ring stably. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of the present invention;

[0024] Figure 2 This is a schematic diagram of the mounting plate structure of the present invention;

[0025] Figure 3 This is a schematic diagram of the externally threaded pipe structure of the present invention;

[0026] Figure 4 for Figure 3 A magnified view of part A in the middle;

[0027] Figure 5 This is a schematic diagram of the first connecting plate structure of the present invention;

[0028] Figure 6 for Figure 5 A magnified view of part B in the middle section;

[0029] Figure 7 This is a schematic diagram of the second connecting plate structure of the present invention;

[0030] Figure 8 This is a schematic diagram of the limiting rod structure of the present invention.

[0031] In the diagram: 1. Mounting plate; 2. Bolt; 3. Dwelling hole; 4. Hydraulic cylinder; 5. Limiting cylinder; 6. Limiting rod; 7. First connecting plate; 8. Second connecting plate; 9. Fixing ring; 10. Fixing cylinder; 11. Extraction pipe; 12. Clamping block; 13. Clamping groove; 14. Filter; 15. Airbag; 16. Protective pad; 17. First through pipe; 18. Second through pipe; 19. Air pump; 20. Solenoid valve; 21. External threaded pipe; 22. Fixing rod; 23. Limiting ring; 24. Rotating ring; 25. External gear ring; 26. Rotating motor; 27. Gear; 28. Extraction pump; 29. ​​Delivery pipe. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0033] This invention provides an underground gas extraction pipeline that helps to seal the borehole at the underground gas extraction location and the fixed cylinder, thereby preventing gas leakage from the borehole at the gas extraction location and preventing environmental impact and safety risks to workers caused by gas leakage.

[0034] Please see Figure 1-8 A type of underground gas extraction pipeline includes an installation plate 1. An insertion hole 3 is provided in the center of the installation plate 1. Hydraulic cylinders 4 are installed in the center of both sides of the upper surface of the installation plate 1. The output rods of the hydraulic cylinders 4 are both upward-facing and mounted with first connecting plates 7. A fixing ring 9 is fixed between adjacent sides of the first connecting plates 7. A fixing cylinder 10 is fixed to the inner ring surface of the fixing ring 9. An extraction pipe 11 is slidably installed on the inner side of the fixing cylinder 10 in the vertical direction. A filter 14 is installed at the lower end of the inner ring surface of the extraction pipe 11. A protective pad 16 is fixed to the outer side of the outer ring surface of the fixing cylinder 10, located below the fixing ring 9. The inner side of the protective pad 16 is fixed... A matching airbag 15 is provided, and a connected external threaded pipe 21 is fixed to the upper surface of the extraction pipe 11. An extraction pump 28 is installed at the upper end of the external threaded pipe 21. After the airbag 15 and the protective pad 16 are enlarged, they will squeeze and seal the borehole where gas extraction is required and the fixed cylinder 10. When in use, it helps to seal the borehole at the gas extraction location and the fixed cylinder 10, which can prevent gas leakage in the borehole at the gas extraction location, prevent the impact on the environment due to gas leakage, and prevent the safety of workers due to gas leakage.

[0035] The protective pad 16 has a first tube 17 connected to the airbag 15 on the top of one side of its outer ring surface. A second tube 18 connected to the airbag 15 is installed on the top of the side of the protective pad 16 away from the first tube 17. Second connecting plates 8 are fixed to both sides of the outer ring surface of the fixing ring 9, corresponding to the first tube 17 and the second tube 18 respectively. The end of the first tube 17 away from the protective pad 16 passes through the upper and lower surfaces of the corresponding positions on the second connecting plate 8. An inflation pump 19 is installed at the end of the first tube 17 away from the protective pad 16, allowing communication between the inflation pump 19 and the airbag 15. The second tube 18 is located away from the protective pad. One end of the second pipe 16 passes through the upper and lower surfaces of the corresponding positions on the second connecting plate 8. A solenoid valve 20 is installed at the end of the second pipe 18 away from the protective pad 16. Fixing rods 22 are fixed in the middle of the four sides of the upper surface of the fixing ring 9. The fixing rods 22 are all in a vertical state. The upper surfaces of the fixing rods 22 are fixed together with a limit ring 23. The fixing rods 22 can fix and limit the limit ring 23. A rotating ring 24 is rotatably installed on the inner side of the inner ring surface of the limit ring 23 through a bearing. The external threaded pipe 21 is in a vertical state. The external threaded pipe 21 passes through the top and bottom of the inner side of the rotating ring 24. The outer side of the external threaded pipe 21 is threadedly connected to the inner side of the rotating ring 24.

[0036] An external gear ring 25 is fixed at the top of the outer ring surface of the rotating ring 24 above the limiting ring 23. A rotating motor 26 is installed in the middle of the upper surface of the first connecting plate 7 on one side. The output shaft of the rotating motor 26 faces upward. A matching gear 27 is installed on the outer side of the upper end of the outer ring surface of the output shaft of the rotating motor 26 corresponding to the external gear ring 25. The rotating motor 26 can easily drive the gear 27 to rotate. The gear 27 and the side of the external gear ring 25 that are close to each other are in a matching meshing state. The gas outlet of the extraction pump 28 faces upward and is connected to a conveying pipe 29. The conveying pipe 29 is in a vertical state. The upper end of the conveying pipe 29 is connected to the external equipment used for gas storage. The extraction pump 28 helps to extract gas.

[0037] The second connecting plate 8 is horizontal. Limiting rods 6 are fixed to the middle of the lower surface of the second connecting plate 8 on the side away from the fixing ring 9. The second connecting plate 8 can fix and limit the limiting rods 6. The limiting rods 6 are all vertical. Limiting cylinders 5 are slidably sleeved on the outer side of the outer ring surface of the limiting rods 6 in the vertical direction. The limiting cylinders 5 are all vertical. The inner ring surface of the limiting cylinders 5 is matched and fitted with the outer ring surface of the corresponding limiting rod 6. The lower end surface of the limiting cylinders 5 is fixedly connected to the corresponding position on the upper surface of the mounting plate 1. The mounting plate 1 can fix and limit the limiting cylinders 5. Matching slots are opened on the inner ring surfaces of the first through-tube 17 on the airbag 15 and the protective pad 16, and matching slots are opened on the inner ring surfaces of the second through-tube 18 on the airbag 15 and the protective pad 16. The second through-tube 18 helps to discharge gas from the airbag 15.

[0038] The extraction pipe 11 is in a vertical position. All four sides of the outer ring of the extraction pipe 11 are fixed with locking blocks 12. All four sides of the inner ring of the fixing cylinder 10 are provided with matching locking grooves 13 corresponding to the locking blocks 12. The locking blocks 12 are slidably connected with the corresponding locking grooves 13 on the fixing cylinder 10 in the vertical direction. The locking grooves 13 and locking blocks 12 help to limit the position between the fixing cylinder 10 and the extraction pipe 11. The placement hole 3 penetrates the upper and lower surfaces of the middle part of the mounting plate 1. Bolts 2 are threaded into the four corners of the mounting plate 1 in the vertical direction. The bolts 2 are all in a vertical position and penetrate the upper and lower surfaces of the corresponding positions on the mounting plate 1. The bolts 2 help to install and limit the position of the mounting plate 1.

[0039] The working principle of this invention is as follows: During use, an external drilling device is used to drill a hole at the location where gas extraction is required in the well. The lower surface of the mounting plate 1 is then aligned with the location where gas extraction is required after drilling. The mounting plate 1 is then installed between the external location where gas extraction is required using bolts 2. The bolts 2 can support and limit the mounting plate 1 and the various components mounted on the mounting plate 1, which helps to stably use the mounting plate 1 and the various components mounted on the mounting plate 1.

[0040] The hydraulic cylinder 4 on the upper surface of the mounting plate 1 is further opened. The mounting plate 1 can fix and limit the hydraulic cylinder 4, which facilitates the stable use of the hydraulic cylinder 4. When the hydraulic cylinder 4 is open, the output rod of the hydraulic cylinder 4 can drive the first connecting plate 7 to move downward. When the first connecting plate 7 moves downward, it can drive the fixing ring 9 to move downward. When the fixing ring 9 moves downward, it can drive the second connecting plate 8 and the fixing cylinder 10 to move downward. When the second connecting plate 8 moves downward, it can drive the limiting rod 6 to move downward along the inner side of the corresponding limiting cylinder 5. The mounting plate 1 can limit the fixing ring 9 through the limiting cylinder 5, the limiting rod 6 and the second connecting plate 8, which helps to move the fixing ring 9 stably.

[0041] When the fixed cylinder 10 moves downward, it can drive the airbag 15 and the protective pad 16 downward, so that the fixed cylinder 10, airbag 15 and protective pad 16 move downward into the borehole where gas extraction is required. Then, the air pump 19 is opened. When the air pump 19 is opened, the air pump 19 can inflate the airbag 15 through the first pipe 17, so that the airbag 15 and the protective pad 16 become larger. After the airbag 15 and the protective pad 16 become larger, they will squeeze and seal the borehole where gas extraction is required and the fixed cylinder 10, which can prevent gas leakage from occurring in the borehole where gas extraction is required.

[0042] The rotating motor 26 on the upper surface of the first connecting plate 7 is further opened. The first connecting plate 7 can fix and limit the rotating motor 26, which helps to use the rotating motor 26 stably. When the rotating motor 26 is open, the output shaft of the rotating motor 26 can drive the gear 27 to rotate. When the gear 27 rotates, it can drive the matching meshing external gear ring 25 to rotate. When the external gear ring 25 rotates, it can drive the rotating ring 24 to rotate. The fixing ring 9 can fix and limit the fixing rod 22. The fixing rod 22 can fix and limit the limiting ring 23, which facilitates the stable use of the limiting ring 23. The limiting ring 23 can limit the rotating ring 24, which helps to rotate the rotating ring 24 stably. When the rotating ring 24 rotates, the external threaded pipe 21 that is threadedly connected to the rotating ring 24 will move downward in the vertical direction. When the external threaded pipe 21 moves downward, it can drive the extraction pipe 11 to move downward.

[0043] When the extraction pipe 11 moves downward, it can drive the locking block 12 to move downward along the locking groove 13 on the fixed cylinder 10. The fixed cylinder 10 can limit the extraction pipe 11 through the locking groove 13 and the locking block 12, so as to facilitate the stable movement of the extraction pipe 11. After the lower end of the extraction pipe 11 is moved to the corresponding position in the borehole where gas extraction is required, the upper end of the conveying pipe 29 is installed between the external equipment for gas collection. The extraction pump 28 is then turned on. With the extraction pump 28 turned on, the extraction pump 28 can extract the gas in the borehole where gas extraction is required through the external threaded pipe 21, the extraction pipe 11 and the filter 14. The extracted gas passes through the filter 14, the extraction pipe 11, the external threaded pipe 21, the extraction pump 28 and the conveying pipe 29 into the external equipment for gas collection. The filter 14 can filter the impurities carried in the gas to facilitate gas extraction and collection.

[0044] After the gas extraction is completed, the solenoid valve 20 is opened to allow the gas in the gasbag 15 to be discharged through the second pipe 18 and the solenoid valve 20. This allows the gasbag 15 and the protective pad 16 to be deflated and reduced in size. The protective pad 16 protects the outside of the gasbag 15, preventing it from rupturing and facilitating its use. After the gasbag 15 and the protective pad 16 are deflated and reduced in size, the fixed cylinder 10 can be moved upwards, which facilitates the disassembly of the extraction pipe 11 and makes it easier to use.

[0045] During use, it helps to seal the borehole at the underground gas extraction location with the fixed cylinder 10, which can prevent gas leakage from the borehole at the gas extraction location, thus preventing environmental impact and safety risks to workers caused by gas leakage.

[0046] Although the present invention has been described above with reference to embodiments, various modifications can be made and components can be replaced with equivalents without departing from the scope of the invention. In particular, as long as there is no structural conflict, the features in the disclosed embodiments can be combined with each other in any manner. The lack of an exhaustive description of these combinations in this specification is merely for the sake of brevity and resource conservation. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. An underground gas extraction pipeline, comprising an mounting plate (1), characterized in that, The mounting plate (1) has a retention hole (3) in the middle. Hydraulic cylinders (4) are installed in the middle of both sides of the upper surface of the mounting plate (1). The output rods of the hydraulic cylinders (4) are all facing upward and are installed with a first connecting plate (7). A fixing ring (9) is fixed between the sides of the first connecting plate (7) that are close to each other. A fixing cylinder (10) is fixed on the inner ring surface of the fixing ring (9). A sampling pipe (11) is slidably installed on the inner side of the fixing cylinder (10) in the vertical direction. A filter (14) is installed at the lower end of the inner ring surface of the sampling pipe (11). A protective pad (16) is fixed on the outer side of the outer ring surface of the fixing cylinder (10) below the fixing ring (9). A matching airbag (15) is fixed on the inner side of the protective pad (16). A connected external threaded pipe (21) is fixed on the upper surface of the sampling pipe (11). A connected sampling pump (28) is installed at the upper end of the external threaded pipe (21). The top of one side of the outer ring surface of the protective pad (16) is equipped with a first tube (17) that communicates with the inside of the airbag (15). The top of the outer ring surface of the protective pad (16) away from the first tube (17) is equipped with a second tube (18) that communicates with the inside of the airbag (15). The two sides of the outer ring surface of the fixing ring (9) are respectively fixed with a second connecting plate (8) corresponding to the first tube (17) and the second tube (18). The end of the first tube (17) away from the protective pad (16) passes through the upper and lower surfaces of the corresponding positions on the second connecting plate (8). The end of the first tube (17) away from the protective pad (16) is equipped with a connected air pump (19). The end of the second tube (18) away from the protective pad (16) passes through the upper and lower surfaces of the corresponding positions on the second connecting plate (8). The end of the second tube (18) away from the protective pad (16) is equipped with a connected solenoid valve (20). A fixing rod (22) is fixed in the middle of the four sides of the upper surface of the fixing ring (9). The fixing rods (22) are all vertical. A limit ring (23) is fixed between the upper surfaces of the fixing rods (22). A rotating ring (24) is rotatably installed on the inner side of the inner ring surface of the limit ring (23) through a bearing. The external threaded tube (21) is vertical. The external threaded tube (21) passes through the top and bottom of the inner side of the rotating ring (24). The outer side of the external threaded tube (21) is threadedly connected to the inner side of the rotating ring (24). The extraction tube (11) is in a vertical state. All four sides of the outer ring of the extraction tube (11) are fixed with a locking block (12). All four sides of the inner ring of the fixing cylinder (10) are provided with matching slots (13) corresponding to the locking blocks (12). The locking blocks (12) are slidably connected to the corresponding slots (13) on the fixing cylinder (10) in the vertical direction.

2. The underground gas extraction pipeline according to claim 1, characterized in that, The top of the outer ring surface of the rotating ring (24) is fixed with an external gear ring (25) on the upper side of the limiting ring (23). A rotating motor (26) is installed in the middle of the upper surface of the first connecting plate (7) on one side. The output shaft of the rotating motor (26) faces upward. A matching gear (27) is installed on the outer side of the upper end of the outer ring surface of the output shaft of the rotating motor (26) corresponding to the external gear ring (25). The gear (27) and the side of the external gear ring (25) that are close to each other are in a matching meshing state.

3. The underground gas extraction pipeline according to claim 2, characterized in that, The gas outlet of the extraction pump (28) faces upward and is connected to a conveying pipe (29). The conveying pipe (29) is vertical and its upper end is connected to an external device for storing gas.

4. The underground gas extraction pipeline according to claim 3, characterized in that, The second connecting plate (8) is in a horizontal state. Limiting rods (6) are fixed in the middle of the side of the lower surface of the second connecting plate (8) away from the fixing ring (9). The limiting rods (6) are all in a vertical state. Limiting cylinders (5) are slidably sleeved on the outer side of the outer ring surface of the limiting rods (6) in the vertical direction.

5. The underground gas extraction pipeline according to claim 4, characterized in that, The limiting cylinders (5) are all in a vertical state. The inner ring surface of the limiting cylinder (5) is matched and fitted with the outer ring surface of the corresponding limiting rod (6). The lower end surface of the limiting cylinder (5) is fixedly connected with the corresponding position on the upper surface of the corresponding mounting plate (1).

6. The underground gas extraction pipeline according to claim 5, characterized in that, The airbag (15) and the protective pad (16) have matching slots on the inner ring surface corresponding to the first through pipe (17), and the airbag (15) and the protective pad (16) have matching slots on the inner ring surface corresponding to the second through pipe (18).

7. The underground gas extraction pipeline according to claim 6, characterized in that, The placement hole (3) penetrates the upper and lower surfaces of the middle part of the mounting plate (1). Bolts (2) are threaded into the four corners of the mounting plate (1) in the vertical direction. The bolts (2) are all vertical and penetrate the upper and lower surfaces of the corresponding positions on the mounting plate (1).

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