Drilling gas extraction sealing device

Abstract

The invention discloses a drilling gas extraction sealing device, and belongs to the technical field of gas extraction sealing. Two sealing air bags are fixed to an extraction pipe of the extraction sealing device, rotating assemblies are arranged in the sealing air bags, adjusting assemblies are arranged on one sides of the rotating assemblies, supporting plates are arranged in the sealing air bags at equal angles, and the adjusting assemblies are connected with the supporting plates. The top ends of the supporting plates are slidably connected with elastic plates; through the rotating assembly and the adjusting assembly, the supporting plate in the sealing air bag is driven to be opened, a gap formed after the supporting plate is opened is filled, and tight sealing of the sealing air bag to a drill hole is achieved; an extendable fixing piece is arranged on one side of the sealing air bag and used for fixing the position of the sealing air bag; according to the invention, slurry and gas leakage can be effectively prevented, and the gas extraction sealing performance is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of gas drainage sealing, and particularly relates to a borehole gas drainage sealing device. Background Art

[0002] Gas drainage sealing is a key step in the coal mine gas drainage system. Its core function is to seal the connection area between the borehole and the drainage pipeline to prevent external air from infiltrating or gas from leaking, thereby ensuring the drainage efficiency and safety. When using a borehole gas drainage sealing device, the "two-block-one-injection" method is usually adopted. First, the drainage pipe is inserted into the borehole to a predetermined depth, and the capsule is located in the borehole sealing section. Then, compressed air or liquid is injected into the capsule through a control valve. After the capsule expands, it clings to the borehole wall to form a primary seal. Then, cement slurry is injected through a grouting pipe to fill the fine gap between the capsule and the borehole wall to form a secondary seal. Finally, after the sealing material solidifies, the drainage pipe is connected to the ground drainage pipeline, and negative pressure drainage is started. Gas enters the pipeline system through the intake hole of the drainage pipe.

[0003] When using a traditional borehole gas drainage sealing device, the sealing airbag needs to fit tightly with the borehole diameter to effectively seal. If there are phenomena such as uneven borehole diameter, local hole enlargement or shrinkage (such as in a coal seam fracture zone) in the borehole, the capsule may not be able to fill the gap after expansion, resulting in slurry leakage or air leakage. The capsule requires a greater expansion force to fit the hole wall, which may cause the overloading of the inflation system or excessive stretching and damage of the capsule. Moreover, when filling with cement, the lateral pressure generated by the cement flow may cause the position of the sealing airbag to shift. Especially when the sealing airbag is not firmly fixed or the spacing is not adjusted properly, it is easy to cause uneven space between the two groups of sealing airbags, resulting in uneven cement filling thickness, and may form local weak areas, reducing the overall support strength.

[0004] In view of the above problems, it is urgent to improve on the basis of the original borehole gas drainage sealing device. Summary of the Invention

[0005] The invention overcomes the deficiencies of the prior art and provides a borehole gas drainage sealing device. The invention is realized through the following technical solutions: A borehole gas drainage sealing device includes a drainage pipe. A conveying pipe for draining gas is arranged at the central axis inside the drainage pipe. Two sealing airbags are fixed on the outer wall of the drainage pipe. A rotating assembly is arranged inside the sealing airbag. An adjusting assembly is arranged on one side of the rotating assembly. Support plates are arranged at equal angles inside the sealing airbag. The adjusting assembly is connected to the support plates. An elastic plate is slidably connected to the top of the support plate. The rotating assembly drives the adjusting assembly to drive the support plates inside the sealing airbag to expand. At the same time, the elastic plate at the top of the support plate slides out of the support plate to fill the gap after the support plate expands, and together they push the outer layer of the sealing airbag to deform, adaptively filling the borehole gap to achieve tight sealing. A circle of fixing parts is arranged around one side of the sealed airbag at equal angles. A fixing component is connected between the fixing parts and the rotating component. A plurality of positioning pins are evenly fixed at the top of the fixing parts. The fixing parts arranged around one side of the sealed airbag are driven by the fixing component to move, so that the positioning pins at the top of the fixing parts are inserted into the coal seam to fix the position of the sealed airbag.

[0006] Further, the rotating component includes a pressing column arranged at the central axis of the extraction pipe. The pressing column is slidably sleeved on the outer wall of the conveying pipe. A rotating column is sleeved on the outer wall of the pressing column. A thread groove is opened on the inner wall of the rotating column. A fixing block matched with the thread groove is fixed on the outer wall of the pressing column. Two rotating rings are fixed at one end of the rotating column. The two rotating rings respectively correspond to a sealed airbag. The rotating ring is connected with the adjusting component.

[0007] Further, the adjusting component includes a fixing ring located on one side of the rotating ring. One side of the fixing ring is fixedly connected with the extraction pipe. One end of the fixing ring is slidably connected with a sliding plate at equal angles. A fixing column is fixed on the side of the sliding plate close to the rotating ring. An arc groove matched with the fixing column is opened on the rotating ring. The side of the sliding plate away from the rotating ring is connected with the bottom of the support plate.

[0008] Further, a cavity for the sliding of the sliding plate is opened on the fixing ring. A first rack is fixed on one side in the cavity. A first gear meshing with the first rack is fixed inside the sliding plate. A belt is rotatably connected at the rotating shaft of the first gear. The other end of the belt is rotatably connected with a first bevel gear. A second bevel gear is meshed at the top of the first bevel gear. A second gear is connected to the top of the second bevel gear through a connecting shaft. A second rack is meshed on one side of the second gear. The top of the second rack is fixed with a connecting plate. The top of the connecting plate is fixedly connected with an elastic plate. A cavity for the movement of the second rack and the connecting plate is opened inside the support plate.

[0009] Further, a cavity for the sliding of the elastic plate is opened at the top of the support plate. Limiting blocks are fixed on both sides of the elastic plate. A cavity matched with the limiting blocks is opened on the support plate. An arc-shaped rubber pad is fixed at the top of the support plate.

[0010] Further, a cavity for placing the first bevel gear and the second bevel gear is opened inside the sliding plate. A cavity for placing the second gear is opened inside the support plate.

[0011] Further, the fixing component includes fixing rods fixed on one side of the pressing column at equal angles. The fixing rods penetrate and are connected with a moving seat. The moving seat is composed of a high-level plane, an inclined plane and a low-level plane. A roller is slidably connected to one side of the moving seat. A sliding rod is arranged outside the roller. The top of the sliding rod is fixed with a fixing part. The sliding rod penetrates the extraction pipe and the sealed airbag.

[0012] Further, an annular plate is fixed to the outer wall of the sliding rod, and a cavity for the annular plate and the sliding rod to move in cooperation is provided in the extraction pipe, and a spring is arranged in the cavity for the annular plate and the sliding rod to move in cooperation; one end of the spring is fixedly connected to the annular plate on the outer wall of the sliding rod, and the other end is fixed to the inner wall of the cavity of the extraction pipe.

[0013] Further, a connecting ring is fixed to the outside of one of the sealing air bags close to the drill hole, and the connecting ring is fixedly connected to the extraction pipe, and a positioning seat is sleeved on the outer wall of the connecting ring in a threaded manner.

[0014] The beneficial effects of the present invention compared with the prior art are as follows: 1. In the present invention, the sliding plate drives the first gear inside it to move synchronously, and then drives the first gear to rotate through the first rack. The rotation of the first gear drives the first bevel gear to rotate through the belt, thereby driving the meshing second bevel gear to rotate, and then driving the second gear to rotate synchronously. The second gear meshes with the second rack to drive the second rack to move, thereby driving the elastic plate to slide outwards in the support plate, filling the gap between every two support plates when the support plate expands outwards, so that the support plate and the elastic plate push the rubber on the outer layer of the sealing air bag to expand outwards, filling the gap between the drill hole after local reaming and the sealing air bag, achieving the effect that the sealing air bag needs to be closely attached to the drill hole diameter when the drill hole diameter changes, effectively preventing slurry leakage and air leakage, and improving the gas extraction sealing performance.

[0015] 2. In the present invention, the pressing column drives the fixing rod to move synchronously, and then drives the moving seat to move. The moving seat drives the sliding rod to move, thereby driving the fixing member to move synchronously, so that the positioning pin arranged on the fixing member pierces into the coal seam to form a stable anchor point, achieving the effect of fixing the position of the sealing air bag; when filling cement, it prevents the situation that the side pressure generated by the flowing cement may cause the position of the sealing air bag to shift, ensuring uniform cement filling and stable support strength. Description of the Drawings

[0016] Figure 1 It is a three-dimensional structure schematic diagram of the present invention.

[0017] Figure 2 It is a side sectional view of the three-dimensional structure schematic diagram of the present invention.

[0018] Figure 3 It is a structure schematic diagram of the connection between the rotating column and the rotating ring of the present invention.

[0019] Figure 4 It is a structure schematic diagram of the connection between the support plate and the elastic plate of the present invention.

[0020] Figure 5 It is a structure schematic diagram of the connection between the fixing column and the sliding plate of the present invention.

[0021] Figure 6 For the present inventionFigure 5 Schematic enlarged view of the structure at location A.

[0022] Figure 7 Schematic structural diagram of the connection between the first gear and the belt of the present invention.

[0023] Figure 8 For the present invention Figure 7 Schematic enlarged view of the structure at location B.

[0024] Figure 9 Schematic structural diagram of the connection between the pressing column and the fixing rod of the present invention.

[0025] Figure 10 For the present invention Figure 9 Schematic enlarged view of the structure at location C.

[0026] Figure 11 Schematic structural diagram of the connection between the sliding rod and the fixing member of the present invention.

[0027] In the figure: 1. Drainage pipe; 2. Sealing airbag; 301. Pressing column; 302. Rotating column; 303. Rotating ring; 401. Arc groove; 402. Fixed column; 403. Fixed ring; 404. Sliding plate; 405. First rack; 406. First gear; 407. Belt; 408. First bevel gear; 409. Second bevel gear; 410. Second gear; 411. Second rack; 412. Connecting plate; 5. Support plate; 6. Elastic plate; 701. Fixed rod; 702. Moving seat; 703. Roller; 704. Sliding rod; 705. Spring; 8. Fixing member; 9. Delivery pipe; 10. Connecting ring; 11. Positioning seat. Detailed implementation manners

[0028] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention will be further described in detail below in conjunction with the embodiments and the drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. The technical solutions of the present invention will be described in detail below in conjunction with the embodiments and the drawings, but the protection scope is not limited thereby.

[0029] See Figures 1 to 11, this embodiment provides a sealing device for borehole gas drainage, including a drainage pipe 1. Two sealing airbags 2 are fixed on the outer wall of the drainage pipe 1. A rotating assembly is arranged inside the sealing airbag 2. An adjusting assembly is arranged on one side of the rotating assembly. A circle of support plates 5 is arranged at equal angles inside the sealing airbag 2. The adjusting assembly is connected to the support plate 5; Four arc-shaped rubber pads are fixed at the top of the support plate 5. An elastic plate 6 is slidably connected to the top of the support plate 5. A cavity for the elastic plate 6 to slide is opened at the top of the support plate 5. Limit blocks are fixed on both sides of the elastic plate 6. Cavities matching the limit blocks are opened on the support plate 5. A circle of fixing parts 8 is arranged at equal angles around one side of the sealing airbag 2. A plurality of positioning pins are evenly fixed at the top of the fixing part 8. A conveying pipe 9 for draining gas is arranged at the central axis inside the drainage pipe 1. A fixing assembly is connected between the fixing part 8 and the rotating assembly; Among them, a connecting ring 10 is fixed on the outer side of one of the sealing airbags 2 close to the borehole, and the connecting ring 10 is fixedly connected to the drainage pipe 1. A positioning seat 11 is sleeved on the outer wall of the connecting ring 10 in a threaded manner.

[0030] In specific implementation, first, the drainage pipe 1 is positioned and fixed in the borehole through the positioning seat 11 on the outer wall of the connecting ring 10, so that the two sealing airbags 2 are in the target position. Then, the sealing airbags 2 are inflated to make them expand and initially adhere to the hole wall. When encountering situations such as local reaming of the borehole, the rotating assembly drives the adjusting assembly to drive the support plate 5 inside the sealing airbag 2 to expand. At the same time, the elastic plate 6 at the top of the support plate 5 slides in the cavity inside the support plate 5 to fill the gap after the support plate 5 expands. The two jointly push the outer rubber of the sealing airbag 2 to deform and adaptively fill the borehole gap to achieve tight sealing. When injecting cement slurry between the two sealing airbags 2, if the side pressure may cause the sealing airbag 2 to shift, the fixing assembly drives the fixing part 8 arranged around one side of the sealing airbag 2 to move, so that the positioning pins at the top of the fixing part 8 are inserted into the coal seam to fix the position of the sealing airbag 2 and ensure the sealing effect.

[0031] As a further implementation scheme of the present invention, the rotating assembly includes a pressing column 301 arranged at the central axis of the drainage pipe 1. The pressing column 301 is slidably sleeved on the outer wall of the conveying pipe 9; A rotating column 302 is sleeved on the outer wall of the pressing column 301. A threaded groove is opened on the inner wall of the rotating column 302. A fixing block matching the threaded groove is fixed on the outer wall of the pressing column 301. Two rotating rings 303 are fixed at one end of the rotating column 302. The two rotating rings 303 respectively correspond to one sealing airbag 2; The rotating ring 303 is connected to the adjusting assembly.

[0032] In specific implementation, when manually or using other equipment to push the pressing column 301 to move along the central axis direction of the drainage pipe 1, the fixing block on its outer wall cooperates with the threaded groove on the inner wall of the rotating column 302 to drive the rotating column 302 to rotate around the axis, and then drive the rotating ring 303 fixed at one end to rotate synchronously. The rotating ring 303 rotates and realizes the transmission control of the adaptive expansion of the sealing airbag 2 through the adjusting assembly.

[0033] As a further embodiment of the present invention, the adjusting assembly includes a fixed ring 403 located on one side of the rotating ring 303, and one side of the fixed ring 403 is fixedly connected to the extraction pipe 1. One end of the fixed ring 403 is slidably connected with a circle of sliding plates 404 at equal angles. A fixed column 402 is fixed on the side of the sliding plate 404 close to the rotating ring 303. The rotating ring 303 is provided with an arc-shaped groove 401 that matches the fixed column 402. The side of the sliding plate 404 away from the rotating ring 303 is connected to the bottom of the support plate 5.

[0034] The fixed ring 403 is provided with a cavity for the sliding plate 404 to slide. A first rack 405 is fixed on one side of the cavity. A first gear 406 meshing with the first rack 405 is fixed inside the sliding plate 404. A belt 407 is rotatably connected to the rotating shaft of the first gear 406. The other end of the belt 407 is rotatably connected to a first bevel gear 408. A second bevel gear 409 is meshed with the top of the first bevel gear 408. The top of the second bevel gear 409 is connected to a second gear 410 through a connecting shaft. A second rack 411 is meshed with one side of the second gear 410.

[0035] In specific implementation, when the rotating ring 303 is driven to rotate, its arc-shaped groove 401 forms a sliding fit with the fixed column 402 on the sliding plate 404, converting the circular motion of the rotating ring 303 into the trajectory motion of the fixed column 402 along the arc-shaped groove 401, and then pushing the sliding plate 404 to perform a linear sliding in the cavity of the fixed ring 403, realizing the mechanical transmission control of the adjusting assembly.

[0036] When the rotating ring 303 rotates, it drives the sliding plates 404 arranged at equal angles on one side of the fixed ring 403 to slide in its cavity. The first gear 406 inside the sliding plate 404 meshes with the first rack 405 fixed in the cavity of the fixed ring 403 and is driven to rotate during the sliding process. The first gear 406 transmits power to the first bevel gear 408 through the belt 407. The first bevel gear 408 then meshes with and drives the second bevel gear 409 to rotate. The second gear 410 connected to the top of the second bevel gear 409 rotates synchronously. Finally, the second gear 410 converts the rotation into a linear motion through meshing with the second rack 411, realizing the drive of the subsequent structure.

[0037] As a further embodiment of the present invention, a connecting plate 412 is fixed to the top end of the second rack 411. The top end of the connecting plate 412 is fixedly connected to the elastic plate 6. A cavity for the second rack 411 and the connecting plate 412 to move is provided inside the support plate 5.

[0038] In specific implementation, the second rack 411 generates a linear movement driven by the second gear 410 meshing with it. The connecting plate 412 fixed to the top of the second rack 411 moves synchronously, and then drives the elastic plate 6 connected thereto to slide in the cavity pre - opened inside the support plate 5, thereby realizing the filling of the gap between every two adjacent support plates 5 by the elastic plate 6.

[0039] As a further implementation scheme of the present invention, a cavity for placing the first bevel gear 408 and the second bevel gear 409 is opened inside the sliding plate 404, and a cavity for placing the second gear 410 is opened inside the support plate 5.

[0040] In specific implementation, specific cavities are opened inside the sliding plate 404 and the support plate 5 for placing the first bevel gear 408, the second bevel gear 409 and the second gear 410 respectively. By providing a housing space for the gears, the stable operation of the gear transmission system is ensured, enabling each gear to complete actions such as rotation and meshing in the corresponding cavity, and realizing the effective transmission and conversion of mechanical power.

[0041] The fixing component includes a fixing rod 701 fixed on one side of the pressing column 301 at equal angles. The fixing rod 701 is connected through a moving seat 702, and the moving seat 702 is composed of a high - level plane, an inclined plane and a low - level plane. A roller 703 is slidably connected to one side of the moving seat 702. A sliding rod 704 is arranged outside the roller 703. A fixing member 8 is fixed at the top of the sliding rod 704, and the sliding rod 704 penetrates through the extraction pipe 1 and the sealing airbag 2.

[0042] In specific implementation, when the pressing column 301 moves, it drives the fixing rod 701 to move synchronously, causing the moving seat 702 penetrating it to move accordingly. Due to the special structure of the moving seat 702 with a high - level plane, an inclined plane and a low - level plane, its movement drives the roller 703 slidably connected to it to switch positions between different planes, and then drives the external sliding rod 704 to move axially. The fixing member 8 fixed at the top of the sliding rod 704 moves synchronously, and the sliding rod 704 penetrates through the extraction pipe 1 and the sealing airbag 2. Finally, the fixing member 8 extends or retracts to complete the fixing of the position of the sealing airbag 2.

[0043] As a further implementation scheme of the present invention, an annular plate is fixed on the outer wall of the sliding rod 704. The extraction pipe 1 is provided with a cavity for the movement of the annular plate and the sliding rod 704, and a spring 705 is arranged in the cavity; one end of the spring 705 is fixedly connected to the annular plate on the outer wall of the sliding rod 704, and the other end is fixed to the inner wall of the cavity of the extraction pipe 1.

[0044] In specific implementation, the annular plate fixed to the outer wall of the sliding rod 704 is adapted to the cavity formed in the extraction pipe 1. When the sliding rod 704 moves, the annular plate slides in the cavity accordingly, guiding and limiting the sliding rod 704. Meanwhile, the spring 705 arranged in the cavity interacts with the annular plate. After the sliding rod 704 is driven to move by an external force, the spring 705 can provide an elastic restoring force to make the sliding rod 704 return to its initial position.

[0045] When the sliding rod 704 drives the annular plate to move, the spring 705 is compressed or stretched to generate an elastic force, which acts on the sliding rod 704 through the annular plate, realizing the automatic reset of the sliding rod 704 after the external force is withdrawn and maintaining the repeatable operation of the fixing assembly.

[0046] The working principle of the borehole gas extraction sealing device described in this embodiment is as follows: When using this borehole gas extraction sealing device, first use a drilling device to open a hole in the gas extraction area, then place the extraction sealing device into the borehole, and determine the position of the sealing airbag 2 in the borehole through the scale fixed to the outer wall of the connecting ring 10. When the sealing airbag 2 reaches the hole sealing position, rotate the positioning seat 11 to fix one end of the extraction pipe 1 to the end of the opened hole. Then, after the fixation is completed, inflate the sealing airbag 2 through an air pump to make it expand and closely adhere to the hole wall to form a sealing boundary. Finally, inject a highly fluid hole sealing material (such as polyurethane, cement slurry or composite slurry) into the annular gap between the two plugging ends through the grouting pipe, and use the grouting pressure to push the material to penetrate into the coal seam fissures around the borehole to form a continuous and dense sealing body, so as to conduct gas extraction through the delivery pipe 9.

[0047] In a soft coal seam, the borehole is prone to deformation resulting in local reaming. After the sealing airbag 2 expands, it may not be able to fill the gap. At this time, push the pressing column 301 to move inside the extraction pipe 1. When the pressing column 301 moves, it will cooperate with the arc-shaped groove 401 formed inside the rotating column 302 through the fixing block on its outer wall and drive the rotating column 302 to rotate (the rotating column 302 is limited to rotate inside the extraction pipe 1). The rotation of the rotating column 302 drives the rotating ring 303 to rotate, and the arc-shaped groove 401 is arranged at equal angles on the rotating ring 303; the rotation of the rotating ring 303 drives the fixed column 402 inside it to move through the arc-shaped groove 401, thereby driving the sliding plate 404 fixedly connected to the fixed column 402 to slide in the cavity formed in the fixed ring 403. The sliding of the sliding plate 404 drives the support plate 5 fixedly connected to its top end to move, and further drives the outer layer rubber of the sealing airbag 2 to expand through the support plate 5 (when the support plate 5 drives the outer layer rubber of the sealing airbag 2 to expand, due to the increase in the circular diameter of the outer layer rubber, only the middle part of the support plate 5 is closely attached to the rubber layer, and the gap between the support plate 5 and the rubber layer at this time is filled by the arc-shaped rubber pad arranged at the top end of the support plate 5), so as to adaptively cooperate with the enlarged borehole.

[0048] When the sliding plate 404 slides, it drives the first gear 406 inside it to move synchronously. By means of the first rack 405 meshing with the first gear 406 and arranged in the cavity opened in the fixed ring 403, the first gear 406 is driven to rotate. The rotation of the first gear 406 drives the first bevel gear 408 to rotate through the belt 407, thereby driving the meshing second bevel gear 409 to rotate. The rotation of the second bevel gear 409 drives the second gear 410 at its top to rotate synchronously, and further drives the second rack 411 meshing with it to move. The movement of the second rack 411 drives the elastic plate 6 to slide outwards in the support plate 5 through the connecting plate 412, filling the gap between every two support plates 5. And due to the elastic property of the elastic plate 6, when the elastic plate 6 slides out of the support plate 5, it will automatically fit the rubber layer on its top. Thus, through the close fit of the support plate 5 and the elastic plate 6 with the rubber layer, the rubber layer is pushed to fill the gap between the sealing airbag 2 and the drilling hole. And through the arrangement of the support plate 5 and the elastic plate 6, when the sealing airbag 2 is squeezed or in an irregular drilling hole, it can automatically deform to provide uniform supporting force and keep the shape and position of the sealing airbag 2 stable.

[0049] Since when the grouting pipe injects cement into the annular gap between the two plugging ends, the lateral pressure generated by the flow of the cement may cause the position of the sealing airbag 2 to shift. When the pressing column 301 is pushed, it drives the fixed rod 701 fixedly connected to one side of it to move synchronously (a cavity for the movement of the fixed rod 701 is opened inside the rotating column 302). The movement of the fixed rod 701 drives the moving seat 702 to move. At this time, the roller 703 slidably connected to one side of it slides from the low plane of the moving seat 702 to the high plane, thereby driving the sliding rod 704 to move outwards of the extraction pipe 1. The movement of the sliding rod 704 drives the fixing member 8 to move synchronously, thereby driving the positioning pin arranged on the fixing member 8 to pierce into the coal seam to fix the position of the sealing airbag 2 (the sliding rod 704 penetrates through the extraction pipe 1 and the end of the sealing airbag 2), effectively offsetting the influence of the grouting lateral pressure, and the sliding rod 704 is reset through the spring 705.

[0050] The above content is a further detailed description of the present invention in combination with specific preferred embodiments. It cannot be determined that the specific embodiments of the present invention are limited to this. For those of ordinary skill in the technical field to which the present invention belongs, without departing from the premise of the present invention, several simple deductions or substitutions can still be made, and all should be regarded as belonging to the patent protection scope determined by the claims submitted by the present invention.

Claims

1. A drilling gas drainage sealing device, comprising a drainage pipe (1), a conveying pipe (9) for draining gas is arranged at the central axis inside the drainage pipe (1), and two sealing air bags (2) are fixed on the outer wall of the drainage pipe (1), and it is characterized in that, A rotating assembly is arranged inside the sealed airbag (2). An adjusting assembly is arranged on one side of the rotating assembly. Support plates (5) are arranged at equal angles inside the sealed airbag (2). The adjusting assembly is connected to the support plates (5). An elastic plate (6) is slidably connected to the top of the support plate (5). The rotating assembly drives the adjusting assembly to drive the support plates (5) inside the sealed airbag (2) to expand. At the same time, the elastic plate (6) at the top of the support plate (5) slides out of the support plate (5) to fill the gap after the support plate (5) expands, and they jointly push the outer layer of the sealed airbag (2) to deform, adaptively filling the drilling gap to achieve tight sealing. A circle of fixing pieces (8) are arranged at equal angles around one side of the sealed airbag (2). A fixing assembly is connected between the fixing pieces (8) and the rotating assembly. A plurality of positioning pins are evenly fixed at the top of the fixing pieces (8). The fixing assembly drives the fixing pieces (8) arranged around one side of the sealed airbag (2) to move, so that the positioning pins at the top of the fixing pieces (8) are inserted into the coal seam to fix the position of the sealed airbag (2).

2. The gas drainage sealing device for borehole extraction according to claim 1, characterized in that, The rotating assembly includes a pressing column (301) arranged at the central axis of the extraction pipe (1). The pressing column (301) is slidably sleeved on the outer wall of the conveying pipe (9). A rotating column (302) is sleeved on the outer wall of the pressing column (301). Thread grooves are formed on the inner wall of the rotating column (302). Fixing blocks are fixed on the outer wall of the pressing column (301) and are matched with the thread grooves. Two rotating rings (303) are fixed at one end of the rotating column (302). The two rotating rings (303) respectively correspond to a sealed airbag (2). The rotating ring (303) is connected to the adjusting assembly.

3. The gas drainage sealing device for borehole extraction according to claim 2, characterized in that, The adjusting assembly includes a fixing ring (403) located on one side of the rotating ring (303). One side of the fixing ring (403) is fixedly connected to the extraction pipe (1). One end of the fixing ring (403) is slidably connected with sliding plates (404) at equal angles. A fixing column (402) is fixed on the side of the sliding plate (404) close to the rotating ring (303). An arc-shaped groove (401) matched with the fixing column (402) is formed on the rotating ring (303). The side of the sliding plate (404) away from the rotating ring (303) is connected to the bottom of the support plate (5).

4. The gas drainage sealing device for borehole extraction according to claim 3, characterized in that, The fixing ring (403) is provided with a cavity for the sliding plate (404) to slide. A first rack (405) is fixed on one side inside the cavity. A first gear (406) meshing with the first rack (405) is fixed inside the sliding plate (404). A belt (407) is rotatably connected to the rotating shaft of the first gear (406). The other end of the belt (407) is rotatably connected to a first bevel gear (408). A second bevel gear (409) is meshed with the top of the first bevel gear (408). A second gear (410) is connected to the top of the second bevel gear (409) through a connecting shaft. A second rack (411) is meshed with one side of the second gear (410). The top of the second rack (411) is fixed with a connecting plate (412). The top of the connecting plate (412) is fixedly connected to the elastic plate (6). Cavities for the second rack (411) and the connecting plate (412) to move are formed inside the support plate (5).

5. The gas drainage sealing device for borehole extraction according to claim 4, characterized in that The top of the support plate (5) is provided with a cavity for the elastic plate (6) to slide. Both sides of the elastic plate (6) are fixed with limit blocks, and the support plate (5) is provided with a cavity that matches the limit blocks; an arc-shaped rubber pad is fixed to the top of the support plate (5).

6. The gas drainage sealing device for borehole according to claim 4, characterized in that, A cavity for placing the first bevel gear (408) and the second bevel gear (409) is provided inside the sliding plate (404), and a cavity for placing the second gear (410) is provided inside the support plate (5).

7. The borehole gas drainage sealing device according to claim 2, characterized in that, The fixed component includes fixed rods (701) fixed on one side of the pressing column (301) at equal angles. The fixed rods (701) are connected through a moving seat (702), and the moving seat (702) is composed of a high-level plane, an inclined plane, and a low-level plane. A roller (703) is slidably connected to one side of the moving seat (702). A sliding rod (704) is arranged outside the roller (703). A fixing member (8) is fixed to the top of the sliding rod (704), and the sliding rod (704) penetrates through the extraction pipe (1) and the sealing airbag (2).

8. The gas drainage sealing device for borehole extraction according to claim 7, wherein An annular plate is fixed to the outer wall of the sliding rod (704). The extraction pipe (1) is provided with a cavity for the annular plate and the sliding rod (704) to move. A spring (705) is arranged in the cavity for the annular plate and the sliding rod (704) to move; one end of the spring (705) is fixedly connected to the annular plate on the outer wall of the sliding rod (704), and the other end is fixed to the inner wall of the cavity of the extraction pipe (1).

9. A gas drainage sealing device for borehole extraction according to claim 1, characterized in that, A connecting ring (10) is fixed to the outside of one of the sealing airbags (2) close to the drilling hole, and the connecting ring (10) is fixedly connected to the extraction pipe (1). A positioning seat (11) is sleeved on the outer wall of the connecting ring (10) in a threaded manner.

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