Gas extraction device

Abstract

The utility model discloses a gas extraction device, which is characterized in that an extraction hole plugging piece is arranged at the bottom of an extraction hole mounting piece, a plug is vertically connected with the bottom of the extraction hole mounting piece in a sliding manner, and a sealing sleeve assembly is connected to the top of the extraction hole mounting piece through a connecting lantern ring; one end of the extraction head assembly is connected with a suction pipeline, the other end of the extraction head assembly penetrates through the interior of the sealing sleeve assembly, and an extraction hole is formed in the lower surface of the extraction head assembly. Through the arrangement of the sealing sleeve assembly and the extraction head assembly, one end of the extraction head assembly pushes the plug to be separated from the extraction hole installation piece, an extraction channel is opened, and extraction is carried out under the action of the gas suction pump; after extraction operation is completed, the extraction head assembly moves to the direction away from the extraction hole installation piece relative to the sealing sleeve assembly, the plug also returns to the state of being attached to the extraction hole installation piece, and after the extraction hole installation piece of the device is installed in the hole, additional plugging does not need to be conducted after extraction is completed.

Description

Technical Field

[0001] The utility model relates to the technical field of gas extraction, in particular to a gas extraction device. Background Art

[0002] Gas extraction is to drill into coal seams and gas-accumulated areas, connect the boreholes to special pipelines, and use extraction equipment to extract the gas in coal seams and goafs to the ground for utilization. Gas extraction is not only an important measure to reduce the amount of gas outburst during the mining process, prevent gas exceeding the limit and accumulation, and prevent gas explosions and coal and gas outburst accidents, but it can also turn harm into benefit and be developed and utilized as a resource associated with coal.

[0003] The gas extraction device in the existing technology does not have the function of sealing the extraction holes. After the extraction is completed, after disassembling the connection structure between the extraction device and the extraction position, an additional sealing operation of the hole is required. The sealing process alone may cause partial leakage of gas, affecting the safety of the extraction operation. Utility Model Content

[0004] The purpose of the present utility model is to provide a gas extraction device to solve the problem that the above-mentioned prior art gas extraction device proposed in the above-mentioned background technology does not have the function of sealing the extraction holes. After the extraction is completed, after the connection structure between the extraction device and the extraction position is disassembled, an additional sealing operation of the hole opening is required. The process of sealing alone may cause partial leakage of gas, affecting the safety of the extraction operation.

[0005] In order to achieve the above-mentioned purpose, the present invention provides the following technical solutions: a gas extraction device, comprising an extraction hole mounting part, an extraction hole plugging part, a sealing sleeve assembly and an extraction head assembly, wherein the extraction hole plugging part is arranged at the bottom of the extraction hole mounting part, the extraction hole plugging part comprises a plug, the plug is vertically slidably connected to the bottom of the extraction hole mounting part, the outer diameter of the plug matches the inner diameter of the through hole of the extraction hole mounting part, the plug and the top of the extraction hole mounting part are in the same plane, and the sealing sleeve assembly is connected by a connecting ring. Connected to the top of the extraction hole mounting piece, the bottom of the sealing sleeve assembly abuts against the surface of the extraction hole mounting piece. The sealing sleeve assembly is a cylindrical structure. One end of the extraction head assembly is connected to the suction pipe, and the other end passes through the interior of the sealing sleeve assembly, and the bottom of the extraction head assembly at this end abuts against the bottom of the sealing sleeve assembly. An extraction hole is set on the lower surface of the extraction head assembly. The sealing sleeve assembly includes a second rubber ring, which is set between the upper edge of the sealing sleeve assembly and the extraction head assembly.

[0006] Preferably, the sealing sleeve assembly also includes a top ring, a connecting tube and a bottom ring. The top ring is arranged on the inner side of the connecting sleeve, and the top ring and the bottom ring are fixedly connected by the connecting tube. The extraction head assembly includes an extraction tube, a limit seat, a movable seat and a second spring. An extraction hole is provided on the surface of the extraction tube. The top of the extraction tube is fixedly connected to the movable seat, and the bottom of the extraction tube is fixedly connected to the limit seat. The sealing sleeve assembly is sleeved on the outside of the extraction tube and is located between the limit seat and the movable seat. A second spring is provided between the movable seat and the top ring.

[0007] Preferably, when the sealing sleeve assembly is outside the extraction tube and close to one side of the movable seat, the movable seat is fixedly connected to the top ring screw.

[0008] Preferably, when the sealing sleeve assembly is outside the extraction tube and close to the limit seat, the outer diameter of the bottom ring is larger than the outer diameter of the top of the plug, and the limit seat matches the groove at the bottom of the bottom ring.

[0009] Preferably, a second sealing gasket is provided at the bottom of the bottom ring, and a third sealing gasket is provided on the upper surface of the limiting seat other than the extraction tube, and the third sealing gasket fits tightly against the bottom ring.

[0010] Preferably, the connecting ring is rotatably connected to the top ring circumference of the sealing sleeve assembly, and a threaded positioning ring is provided on the upper surface of the extraction hole mounting piece. The threaded positioning ring and the center of the extraction hole mounting piece are on the same axis, and the threaded positioning ring is threadedly connected to the connecting ring.

[0011] Preferably, a convex edge is provided on the peripheral side of the top ring, and a groove is provided on the inner side of the through hole at the top of the connecting collar, and the convex edge and the groove correspond in position and size.

[0012] Preferably, the extraction hole plugging member further includes a support rod, a base and a movable member, the support rod is fixedly connected to the bottom of the extraction hole mounting member, the bottom of the support rod is fixedly connected, and the plug is vertically slidably connected to the base through the movable member.

[0013] Preferably, the movable part includes a positioning rod, a first spring and a movable rod, the positioning rod is fixedly connected above the base, the positioning rod is sleeved on the outside of the movable rod, one end of the movable rod is connected to the positioning rod through the first spring, and the other end of the movable rod is fixedly connected to the plug.

[0014] Preferably, a first sealing gasket is provided on the peripheral side of the plug, and the first sealing gasket is tightly fitted with the through hole of the extraction hole mounting piece.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] The utility model pushes the extraction head assembly toward the extraction hole mounting part through the arrangement of the sealing sleeve assembly and the extraction head assembly. The extraction head assembly moves relative to the sealing sleeve assembly. One end of the extraction head assembly pushes the plug to separate from the extraction hole mounting part, opening the extraction channel. Under the action of the gas suction pump, the extraction hole at this end of the extraction head assembly allows underground gas to be extracted toward the suction pipe through the extraction hole mounting part. After the extraction operation is completed, the extraction head assembly moves relative to the sealing sleeve assembly to a direction away from the extraction hole mounting part, thereby canceling the squeezing of the plug by the extraction head assembly, and the plug also returns to a state of being in contact with the extraction hole mounting part, completing the sealing of the extraction hole mounting part. The device can not only extract gas, but also has the function of sealing the extraction holes after the extraction is completed. Through the connection structure of the sealing sleeve assembly, the extraction head assembly and the extraction hole mounting part, after the extraction hole mounting part of the device is installed in the hole, there is no need for additional sealing after the extraction is completed. Therefore, throughout the entire process until the end of extraction, the device can ensure that there will be no gas leakage, thereby ensuring the safety of the extraction operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic structural diagram of the gas extraction device of the present utility model.

[0018] Figure 2 This is a schematic diagram of the structure of the extraction hole plugging piece of the utility model.

[0019] Figure 3 This is a schematic diagram of the structure of the movable parts of the utility model.

[0020] Figure 4 This is a schematic diagram of the position distribution of the plugs of the present utility model.

[0021] Figure 5 This is a schematic diagram of the plug structure of the present utility model.

[0022] Figure 6 This is a schematic structural diagram of the sealing sleeve assembly of the present utility model.

[0023] Figure 7 This is a schematic diagram of the extraction head assembly structure of the present utility model.

[0024] Figure 8 This is a schematic diagram of the connection structure between the sealing sleeve assembly and the extraction head assembly of the utility model.

[0025] Figure 9 This is a schematic diagram of the cross-sectional structure showing the position distribution of the sealing sleeve assembly, the extraction head assembly and the extraction hole mounting piece of the present invention.

[0026] Figure 10 This is a schematic diagram of the cross-sectional structure of the sealing sleeve assembly and the connecting ring of the present invention.

[0027] Figure 11 This is a schematic diagram of the cross-sectional structure of the position distribution of the sealing sleeve assembly and the extraction head assembly of the present utility model.

[0028] In the figure: 1. extraction hole mounting part; 11. hole tube; 111. first rubber ring; 12. threaded positioning ring; 2. extraction hole plugging part; 21. support rod; 22. base; 23. movable part; 231. positioning rod; 232. first spring; 233. movable rod; 24. plug; 241. first sealing gasket; 3. connecting ring; 31. groove; 4. sealing sleeve assembly; 41. top ring; 411. convex edge; 42. connecting tube; 43. bottom ring; 431. second sealing gasket; 44. second rubber ring; 5. extraction head assembly; 51. extraction tube; 511. extraction hole; 52. limit seat; 521. third sealing gasket; 53. movable seat; 54. second spring; 6. suction pipe. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0030] An embodiment provided by the present invention: Figure 1 As shown, a gas extraction device includes an extraction hole mounting member 1, an extraction hole plugging member 2, a connecting collar 3, a sealing sleeve assembly 4, an extraction head assembly 5 and a suction pipe 6.

[0031] like Figure 2 As shown, the extraction hole plugging member 2 is arranged at the bottom of the extraction hole mounting member 1. The extraction hole plugging member 2 also includes a support rod 21, a base 22, a movable member 23 and a plug 24. The plug 24 is vertically slidably connected to the bottom of the extraction hole mounting member 1. The support rod 21 is fixedly connected to the bottom of the extraction hole mounting member 1. The bottom of the support rod 21 is fixedly connected, and the plug 24 is vertically slidably connected to the base 22 through the movable member 23.

[0032] Before extracting underground gas, first install the extraction hole mounting part 1 and the extraction hole plugging part 2 at the position of the drilled hole. The hole tube 11 of the extraction hole mounting part 1 matches the size of the hole drilled during gas extraction, and a first rubber ring 111 is provided between the hole tube 11 and the drilled hole wall for sealing. During the extraction operation, after installing the connecting sleeve 3 and the sealing sleeve assembly 4 on the extraction hole mounting part 1, the position of the plug 24 can be changed to open the channel on the extraction hole mounting part 1; after removing and installing the connecting sleeve 3 and the sealing sleeve assembly 4, the plug 24 returns to its original position to close the channel on the extraction hole mounting part 1. The presence of the extraction hole mounting part 1 and the extraction hole plugging part 2 does not completely seal the hole, which facilitates repeated extraction work at the location and simplifies the operating steps.

[0033] like Figure 2 and Figure 3 As shown, the movable member 23 includes a positioning rod 231, a first spring 232, and a movable rod 233. The positioning rod 231 is fixedly connected to the top of the base 22, and the positioning rod 231 is sleeved on the outside of the movable rod 233. One end of the movable rod 233 is connected to the positioning rod 231 through the first spring 232, and the other end of the movable rod 233 is fixedly connected to the plug 24. When pressure is applied to the top of the plug 24, the movable rod 233 moves toward the positioning rod 231, the first spring 232 is compressed, and the plug 24 moves to a position relatively separated from the extraction hole mounting member 1, completing the connection between the extraction hole mounting member 1 and the channel; when the pressure applied to the top of the plug 24 is removed, the first spring 232 is released, pushing the plug 24 back into the through hole of the extraction hole mounting member 1, completing the closure of the extraction hole mounting member 1 to the channel.

[0034] like Figure 4 and Figure 5 As shown, plug 24 is a truncated cone with a smaller diameter on its upper base than on its lower base. The outer diameter of plug 24 matches the inner diameter of the through-hole of extraction hole mounting member 1. A first sealing gasket 241 is provided around plug 24, which fits tightly against the through-hole of extraction hole mounting member 1. Plug 24 and the top of extraction hole mounting member 1 are flush with each other. Under the action of first spring 232, the inclined surface of plug 24 improves the fit between extraction hole mounting member 1 and plug 24. At the same time, the action of first sealing gasket 241 increases the contact area between extraction hole mounting member 1 and plug 24, improving the sealing effect and preventing gas leakage when extraction hole mounting member 1 closes the passage.

[0035] like Figure 6 As shown, the sealing sleeve assembly 4 also includes a top ring 41 , a connecting tube 42 , a bottom ring 43 and a second rubber ring 44 . The top ring 41 is arranged on the inner side of the connecting sleeve 3 , and the top ring 41 and the bottom ring 43 are fixedly connected by the connecting tube 42 .

[0036] like Figure 7As shown, the extraction head assembly 5 includes an extraction tube 51, a limiting seat 52, a movable seat 53 and a second spring 54. An extraction hole 511 is set on the surface of the extraction tube 51. The top of the extraction tube 51 is fixedly connected to the movable seat 53, and the bottom of the extraction tube 51 is fixedly connected to the limiting seat 52. A second spring 54 is set between the movable seat 53 and the top ring 41.

[0037] like Figure 8-11 As shown, the sealing sleeve assembly 4 is connected to the top of the extraction hole mounting member 1 through the connecting collar 3. The connecting collar 3 is rotatably connected to the circumference of the top ring 41 of the sealing sleeve assembly 4. A convex edge 411 is provided on the circumference of the top ring 41. A groove 3131 is provided on the inner side of the through hole at the top of the connecting collar 3. The convex edge 411 and the groove 3131 correspond in position and size. A threaded positioning ring 12 is provided on the upper surface of the extraction hole mounting member 1. The threaded positioning ring 12 and the center of the extraction hole mounting member 1 are on the same axis. The interior of the connecting collar 3 is provided with a thread, and the exterior of the threaded positioning ring 12 is provided with a thread. The threaded positioning ring 12 is threadedly connected to the connecting collar 3 to fix the connecting collar 3 on the extraction hole mounting member 1.

[0038] When extracting underground gas, the connecting collar 3, which is connected to the sealing sleeve assembly 4 of the extraction head assembly 5, can be installed on the threaded positioning ring 12 of the extraction hole mounting member 1 to connect the extraction hole mounting member 1 with the suction pipe 6. When the extraction operation is completed, the connecting collar 3 is removed from the extraction hole mounting member 1, leaving the extraction hole mounting member 1 and the extraction hole plugging member 2 in their original positions.

[0039] like Figure 8-11 As shown, the sealing sleeve assembly 4 is a cylindrical structure, one end of the extraction head assembly 5 is connected to the suction pipe 6, and the other end passes through the inside of the sealing sleeve assembly 4. The sealing sleeve assembly 4 is sleeved on the outside of the extraction pipe 51, and is located between the limit seat 52 and the movable seat 53. The second rubber ring 44 is arranged at a position between the upper edge of the inside of the sealing sleeve assembly 4 and the extraction head assembly 5. An extraction hole 511 is provided on the lower surface of the extraction head assembly 5. The sealing sleeve assembly 4 and the extraction head assembly 5 form a relatively movable structure, and the second rubber ring 44 enables the top of the extraction head assembly 5 and the bottom end of the sealing sleeve assembly 4 to form a connecting structure, ensuring that during the extraction process, gas can only enter the extraction pipe 51 through the extraction hole 511 after entering from the bottom end of the sealing sleeve assembly 4, and then be transmitted to the suction pipe 6 at the top of the extraction head assembly 5, effectively avoiding gas leakage at the connection between the sealing sleeve assembly 4 and the extraction head assembly 5.

[0040] When the connecting ring 3 is tightened on the threaded positioning ring 12 on the extraction hole mounting part 1, the outer diameter of the bottom ring 43 is larger than the plug 24 and smaller than the inner diameter of the threaded positioning ring 12. The lower surface of the bottom ring 43 at the bottom of the sealing sleeve assembly 4 abuts against the surface of the extraction hole mounting part 1. A second sealing gasket 431 is provided at the bottom of the bottom ring 43, and the second sealing gasket 431 fits tightly with the extraction hole mounting part 1. When the connecting ring 3 is tightened, the bottom ring 43 covers the surface of the extraction hole mounting part 1 and forms a sealed connection, ensuring that when the plug 24 is opened, the inner side of the extraction hole mounting part 1 forms a connecting structure with the sealing sleeve assembly 4 and the extraction head assembly 5. The gas inside the extraction hole mounting part 1 enters the interior of the sealing sleeve assembly 4 through the channel between the plug 24, avoiding gas leakage between the bottom ring 43 and the extraction hole mounting part 1.

[0041] Under the action of the connecting ring 3, the sealing sleeve assembly 4 and the extraction head assembly 5, the connection between the extraction hole mounting part 1 and the suction pipe 6 is completed, and the next step of gas extraction can be carried out. The movable seat 53 of the extraction head assembly 5 is pushed toward the extraction hole mounting part 1. The sealing sleeve assembly 4 is on the side of the movable seat 53 outside the extraction pipe 51, and the distance between the movable seat 53 and the top ring 41 is reduced. The second spring 54 is compressed and the movable seat 53 and the top ring 41 are fixedly connected by screws. At this time, the extraction hole 511 of the extraction pipe 51 exceeds the position of the bottom ring 43 of the sealing sleeve assembly 4. At the same time, the movable seat 53 also pushes the plug 24 to separate from the extraction hole mounting part 1, opening the extraction channel. Under the action of the gas suction pump, the underground gas is extracted toward the suction pipe 6 through the extraction hole mounting part 1.

[0042] After the extraction operation is completed, the screws connecting the movable seat 53 and the top ring 41 are removed. Under the action of the second spring 54, the extraction head assembly 5 as a whole moves in the direction away from the extraction hole mounting part 1. The distance between the movable seat 53 and the top ring 41 increases, and the sealing sleeve assembly 4 is close to the side of the limit seat 52 outside the extraction tube 51. Since the outer diameter of the limit seat 52 is larger than the extraction tube 51, the outer diameter of the limit seat 52 is larger than the inner diameter of the through hole of the bottom ring 43 and smaller than the inner diameter of the groove 31 at the bottom of the bottom ring 43. The limit seat 52 at the bottom of the extraction head assembly 5 is consistent with the groove 31 at the bottom of the bottom ring 43, and the limit seat 52 abuts the groove 31 at the bottom of the bottom ring 43 of the sealing sleeve assembly 4. The limit seat 52 returns to the groove 31 of the bottom ring 43 of the sealing sleeve assembly 4, so that the squeeze of the movable seat 53 on the plug 24 is cancelled, and the plug 24 also returns to the state of being in contact with the extraction hole mounting part 1. The sum of the heights of the limit seat 52 and the third sealing gasket 521 is less than or equal to the height of the groove 31 at the bottom of the bottom ring 43, ensuring that the plug 24 has completed the sealing of the extraction hole installation part 1 before the connecting ring 3 is removed to separate the extraction hole installation part 1 from the sealing sleeve assembly 4. Finally, the connecting ring 3 is removed from the extraction hole installation part 1 to complete the gas extraction operation. The third sealing gasket 521 is set on the upper surface of the limit seat 52 other than the extraction tube 51. The third sealing gasket 521 fits tightly against the bottom ring 43. The third sealing gasket 521 forms a seal between the limit seat 52 and the bottom ring 43, which can ensure that after being removed from the extraction hole installation part 1, the gas in the suction pipe 6 is not easy to leak from between the limit seat 52 and the bottom ring 43.

[0043] The device can not only extract gas, but also has the function of sealing the extraction holes after the extraction is completed. Through the matching use of the sealing sleeve assembly 4, the extraction head assembly 5 and the connection structure of the extraction hole mounting part 1, after the extraction hole mounting part 1 of the device is installed in the hole, there is no need for additional sealing after the extraction is completed, so that the device can ensure that there will be no gas leakage during the entire process until the end of extraction, thereby ensuring the safety of the extraction operation; at the same time, the sealing sleeve assembly 4 and the extraction head assembly 5 can be respectively connected to the extraction hole mounting parts 1 at different positions to perform extraction work, thereby improving the gas extraction efficiency.

[0044] The above are only embodiments of the present invention, and common knowledge such as the specific structures and characteristics of the scheme are not described in detail here. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes that fall within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any figure mark in the claims should not be regarded as limiting the claim involved.

Claims

1. A gas extraction device, characterized in that: The invention comprises an extraction hole mounting part (1), an extraction hole plugging part (2), a sealing sleeve assembly (4) and an extraction head assembly (5), wherein the extraction hole plugging part (2) is arranged at the bottom of the extraction hole mounting part (1), the extraction hole plugging part (2) comprises a plug (24), the plug (24) is vertically slidably connected to the bottom of the extraction hole mounting part (1), the outer diameter of the plug (24) matches the inner diameter of the through hole of the extraction hole mounting part (1), the plug (24) and the top of the extraction hole mounting part (1) are in the same plane, and the sealing sleeve assembly (4) is connected to the top of the extraction hole mounting part (1) through a connecting ring (3). The bottom of the sealing sleeve assembly (4) abuts against the surface of the extraction hole mounting member (1); the sealing sleeve assembly (4) is a cylindrical structure; one end of the extraction head assembly (5) is connected to the suction pipe (6); the other end passes through the interior of the sealing sleeve assembly (4); and the bottom of the extraction head assembly (5) at this end abuts against the bottom of the sealing sleeve assembly (4); an extraction hole (511) is provided on the lower surface of the extraction head assembly (5); the sealing sleeve assembly (4) includes a second rubber ring (44); and the second rubber ring (44) is provided at a position between the upper edge of the interior of the sealing sleeve assembly (4) and the extraction head assembly (5).

2. A gas extraction device according to claim 1, characterized in that: The sealing sleeve assembly (4) further comprises a top ring (41), a connecting sleeve (42) and a bottom ring (43); the top ring (41) is arranged on the inner side of the connecting sleeve (3); the top ring (41) and the bottom ring (43) are fixedly connected by the connecting sleeve (42); the extraction head assembly (5) comprises an extraction tube (51), a limiting seat (52), a movable seat (53) and a second spring (54); an extraction hole (511) is arranged on the surface of the extraction tube (51); the top of the extraction tube (51) is fixedly connected to the movable seat (53); the bottom of the extraction tube (51) is fixedly connected to the limiting seat (52); the sealing sleeve assembly (4) is sleeved on the outside of the extraction tube (51) and is located between the limiting seat (52) and the movable seat (53); a second spring (54) is arranged between the movable seat (53) and the top ring (41).

3. A gas extraction device according to claim 2, characterized in that: The sealing sleeve assembly (4) is in a state where it is located outside the extraction tube (51) and close to one side of the movable seat (53), and the movable seat (53) is fixedly connected to the top ring (41) by screws.

4. A gas extraction device according to claim 2, characterized in that: When the sealing sleeve assembly (4) is in a state outside the extraction tube (51) and close to the side of the limit seat (52), the outer diameter of the bottom ring (43) is larger than the outer diameter of the top of the plug (24), and the limit seat (52) is consistent with the groove at the bottom of the bottom ring (43).

5. A gas extraction device according to claim 2, characterized in that: A second sealing gasket (431) is provided at the bottom of the bottom ring (43), and a third sealing gasket (521) is provided on the upper surface of the limiting seat (52) other than the extraction tube (51), and the third sealing gasket (521) is tightly fitted to the bottom ring (43).

6. A gas extraction device according to claim 2, characterized in that: The connecting collar (3) is rotatably connected to the circumferential side of the top ring (41) of the sealing sleeve assembly (4); a threaded positioning ring (12) is provided on the upper surface of the extraction hole mounting member (1); the threaded positioning ring (12) and the center of the extraction hole mounting member (1) are on the same axis; the threaded positioning ring (12) is threadedly connected to the connecting collar (3).

7. A gas extraction device according to claim 6, characterized in that: A convex edge (411) is provided on the circumferential side of the top ring (41), and a groove (31) is provided on the inner side of the through hole at the top of the connecting collar (3). The convex edge (411) and the groove (31) correspond in position and have matching sizes.

8. The gas extraction device according to claim 1, characterized in that: The extraction hole plugging member (2) further comprises a support rod (21), a base (22) and a movable member (23), wherein the support rod (21) is fixedly connected to the bottom of the extraction hole mounting member (1), the bottom of the support rod (21) is fixedly connected, and the plug (24) is vertically slidably connected to the base (22) via the movable member (23).

9. A gas extraction device according to claim 8, characterized in that: The movable member (23) comprises a positioning rod (231), a first spring (232) and a movable rod (233); the positioning rod (231) is fixedly connected above the base (22); the positioning rod (231) is sleeved on the outside of the movable rod (233); one end of the movable rod (233) is connected to the positioning rod (231) via the first spring (232); and the other end of the movable rod (233) is fixedly connected to the plug (24).

10. The gas extraction device according to claim 1, characterized in that: A first sealing gasket (241) is provided on the peripheral side of the plug (24), and the first sealing gasket (241) is tightly fitted with the through hole of the extraction hole mounting member (1).

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