Leakage-proof device for coal mine gas extraction

Abstract

The invention relates to a leakage-proof device for coal mine gas extraction, and belongs to the field of gas extraction. The device comprises a sealing cylinder and a sealing sleeve arranged on the sealing cylinder in a sleeving mode, the sealing cylinder is inserted into the gas hole, and the sealing sleeve covers an orifice of the gas hole; a lifting block which ascends and descends in the axial direction of the sealing cylinder is arranged in the sealing cylinder, and a plurality of arc-shaped expansion rings are arranged on the side wall, inserted into the gas hole, of the sealing cylinder and connected with the lifting block; the expansion ring is constructed to move from a first position to a second position along the radial direction of the sealing cylinder under the pushing of the lifting block, and the expansion ring is embedded into the side wall of the sealing cylinder at the first position; at the second position, the expansion ring abuts against the hole wall of the gas hole to block the gas hole. The device can adapt to gas holes of different sizes, sealing flexibility and reliability are improved, residual gas around the gas holes can be adsorbed and removed, and the risk of gas leakage is further reduced.

Description

Technical Field

[0001] The invention belongs to the field of gas extraction and relates to a coal mine gas extraction leakage prevention device. Background Art

[0002] Coal mine gas extraction refers to the technical measures of extracting gas from coal seams, rock formations and goafs using special equipment and pipelines. Its main purpose is to reduce the gas content underground in coal mines and reduce safety risks such as gas explosions and gas outbursts. At the same time, the extracted gas can also be used, such as for power generation and heating, to achieve comprehensive utilization of resources.

[0003] In the process of coal mining, the presence of gas is a major safety hazard. Gas is mainly methane, which is flammable and explosive. Therefore, effective management and control of gas is an important part of ensuring safe production in coal mines. Gas extraction technology reduces the gas concentration underground by extracting gas from coal seams, thereby reducing the risk of gas accidents.

[0004] However, after gas extraction is completed, there may be some residual gas in the gas holes. If these gas holes are not effectively blocked and protected, the residual gas may gradually leak into the mine, thereby increasing the gas concentration again and posing a safety hazard. In addition, long-term unblocked gas holes may also cause problems such as surface collapse, affecting the normal production and environmental safety of coal mines. Summary of the invention

[0005] In view of this, an object of the present invention is to provide a coal mine gas extraction leakage prevention device that can effectively block and absorb residual gas in the gas holes.

[0006] To achieve the above-mentioned purpose, the present invention provides the following coal mine gas extraction leakage prevention device, including a sealing cylinder and a sealing sleeve mounted on the sealing cylinder, the sealing cylinder is inserted into the gas hole, and the sealing sleeve covers the orifice of the gas hole; a plurality of arc-shaped expansion rings are arranged on the side wall of the sealing cylinder inserted into the gas hole; the expansion ring is constructed to move from a first position to a second position along the radial direction of the sealing cylinder, wherein, in the first position, the expansion ring is embedded in the side wall of the sealing cylinder; in the second position, the expansion ring presses against the hole wall of the gas hole to seal the gas hole.

[0007] Optionally, a lifting block which is lifted and lowered along the axial direction of the sealing cylinder is provided in the sealing cylinder, each expansion ring is connected to the lifting block through a push rod, the mounting block is fixed on the inner wall of the sealing cylinder, and the push rod is slidably arranged in the mounting block; the side surface of the lifting block is constructed to be inclined toward the center of the sealing cylinder in the direction close to the gas hole, one end of the push rod is slidably connected to the side surface of the lifting block, and the other end passes through the sealing cylinder and is fixedly connected to the expansion ring; the lifting block descends to push the push rod to move outside the sealing cylinder, thereby driving the expansion ring to move from the first position to the second position along the radial direction of the sealing cylinder.

[0008] Optionally, an airbag groove is provided on the expansion ring, and the airbag is received in the airbag groove.

[0009] Optionally, an air pump is provided on the mounting block, and an air guide tube of the air pump is embedded in the push rod and penetrates into the expansion ring along the push rod to communicate with the airbag, so as to inflate the airbag to expand it, or extract air from the airbag to compress it.

[0010] Optionally, a guide screw is arranged in the sealing cylinder along its axial direction; a first motor is arranged on the top of the sealing cylinder, and an output end of the first motor is connected to the guide screw; and the lifting block is slidably arranged on the guide screw.

[0011] Optionally, the lifting block is a truncated pyramid, and its side surface is constructed to be inclined toward the center of the sealing cylinder in a direction close to the gas hole; each side surface of the lifting block is provided with a guide inclined groove, and the push rod is slidably arranged in the guide inclined groove.

[0012] Optionally, the sealing sleeve is a hollow sleeve, and its lower surface is configured as a filter screen; a plurality of adsorption plates are arranged in the sealing sleeve in a circumferential motion along the sealing sleeve to absorb gas overflowing from the orifice of the gas hole.

[0013] Optionally, a rotating ring is arranged on the surface of the sealing tube and is located inside the sealing tube, and is configured to rotate around the sealing tube; a second motor is arranged on the upper surface of the sealing tube, and the output end of the second motor is inserted into the sealing tube, and a transmission gear is fixed on the output end of the second motor; a plurality of gear blocks meshing with the transmission gear are arranged on the rotating ring, and a plurality of adsorption plates are arranged on the rotating ring; the rotating ring is driven by the second motor to rotate, thereby driving the adsorption plate to move circumferentially along the sealing tube.

[0014] Optionally, a connecting rod is rotatably provided on the side of the adsorption plate close to the sealing cylinder, and the adsorption plate is connected to the swivel through the connecting rod; a guide slide rod is fixedly provided on the side of the adsorption plate close to the side wall of the sealing sleeve, and a guide slide groove matching the guide slide rod is provided on the side wall of the sealing sleeve; the swivel drives the adsorption plate to move circumferentially along the sealing sleeve, and the guide slide rod rolls in the guide ring groove to drive the adsorption plate to rotate around the connecting rod.

[0015] Optionally, an inner bevel gear is arranged at the notch of the guide ring groove, and a bevel gear meshing with the inner bevel gear is arranged at the end of the guide slide rod.

[0016] Optionally, the upper surface of the lifting block is provided with a plurality of guide columns extending radially along the sealing cylinder, and the inner wall of the sealing cylinder is provided with a plurality of guide grooves cooperating with the guide columns.

[0017] Optionally, a limit baffle is provided at one end of the push rod close to the lifting block, and a spring is sleeved on the rod body of the push rod located between the limit baffle and the mounting block.

[0018] Optionally, a plurality of fixing pins are provided on the outer edge of the lower surface of the sealing sleeve to enhance the connection stability between the sealing sleeve and the gas hole surface.

[0019] The beneficial effects of the present invention are:

[0020] The present invention provides a coal mine gas extraction leakage prevention device, which is inserted into the gas hole through a sealing cylinder and is arranged on the gas hole through a sealing sleeve, thereby realizing effective sealing of the gas hole. A gas plugging assembly (mainly a push rod and an expansion ring) is provided in the sealing cylinder, and a gas absorption assembly (mainly a rotating ring adsorption plate) is provided in the sealing sleeve, and the two together constitute a dynamic sealing system. The gas plugging assembly can adapt to gas holes of different sizes, which not only improves the flexibility of the seal, but also ensures the reliability of the seal, and further reduces the possibility of gas leakage. The gas adsorption assembly can adsorb and remove the residual gas around the gas hole, further reducing the risk of gas leakage and improving safety. The gas plugging assembly and the gas absorption assembly can effectively prevent gas from leaking from the orifice and reduce the gas concentration, which is of great significance for reducing safety risks such as gas explosions.

[0021] Other advantages, objectives and features of the present invention will be described in the following description to some extent, and to some extent, will be obvious to those skilled in the art based on the following examination and study, or can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be described in detail below in conjunction with the accompanying drawings, wherein:

[0023] Figure 1 The structure of the coal mine gas extraction and leakage prevention device proposed by the present invention is shown in FIG. Figure 1 ;

[0024] Figure 2 The structure of the coal mine gas extraction and leakage prevention device proposed by the present invention is shown in FIG. Figure 2 ;

[0025] Figure 3 The structure of the coal mine gas extraction and leakage prevention device proposed by the present invention is shown in FIG. Figure 3 ;

[0026] Figure 4 This is a structural schematic diagram of the lifting block in the coal mine gas extraction and leakage prevention device proposed by the present invention;

[0027] Figure 5 This is a schematic diagram of the structure of the sealing sleeve in the coal mine gas extraction and leakage prevention device proposed by the present invention;

[0028] Figure 6 This is a schematic diagram of the structure of the rotating ring in the coal mine gas extraction and leakage prevention device proposed by the present invention;

[0029] Figure 7 This is a schematic diagram of the structure of the gas adsorption component in the coal mine gas extraction and leakage prevention device proposed by the present invention;

[0030] Figure 8 for Figure 2 A partial enlarged view of point A in the middle.

[0031] Reference numerals:

[0032] 1-sealing cylinder; 101-guide groove; 102-annular groove; 11-handle; 12-first motor; 13-guide screw rod; 14-swivel ring; 15-tooth block; 16-connecting rod; 17-adsorption plate; 18-guide slide rod; 19-bevel gear; 2-sealing sleeve; 201-annular groove; 21-filter screen; 22-fixing nail; 23-inner bevel gear; 24-second motor; 25-transmission rod; 26-transmission gear; 3-lifting block; 301-guide inclined groove; 31-guide screw rod; 4-mounting block; 41-gas concentration sensor; 42-air pump; 43-air guide pipe; 5-push rod; 51-guide block; 52-limit baffle; 53-spring; 6-expansion ring; 601-airbag groove; 61-airbag. DETAILED DESCRIPTION

[0033] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments only illustrate the basic concept of the present invention in a schematic manner, and the following embodiments and features in the embodiments can be combined with each other without conflict.

[0034] Among them, the drawings are only used for illustrative explanations, and they only represent schematic diagrams rather than actual pictures, and should not be understood as limitations on the present invention. In order to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of actual products. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0035] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "front", "rear", etc. indicate the orientation or position relationship, they are based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0036] In the process of coal mining, the presence of gas is a major safety hazard. Gas is mainly methane, which is flammable and explosive. Therefore, effective management and control of gas is an important part of ensuring safe production in coal mines. Gas extraction technology reduces the gas concentration underground by extracting gas from the coal seam, thereby reducing the risk of gas accidents. However, after the gas extraction is completed, there may be a certain amount of residual gas in the gas holes. If these gas holes are not effectively blocked and protected, the residual gas may gradually leak into the mine, thereby increasing the gas concentration again and posing a safety hazard. In addition, gas holes that have not been blocked for a long time may also cause problems such as surface collapse, affecting the normal production and environmental safety of coal mines.

[0037] To this end, the present invention discloses a coal mine gas extraction leakage prevention device, which aims to solve the problem of incomplete sealing of gas holes and easy leakage in the prior art.

[0038] Reference Figure 1 to Figure 4 As shown, the coal mine gas extraction and leakage prevention device mainly includes a sealing cylinder 1 inserted into the gas hole and a sealing sleeve 2 sleeved in the middle of the sealing cylinder 1. The sealing cylinder 1 is provided with a gas blocking component, and the sealing sleeve 2 is provided with a gas absorption component. The sealing cylinder 1 and the sealing sleeve 2 cooperate with each other to ensure the effective sealing of the gas hole, and perform an unsealing operation when necessary.

[0039] The sealing cylinder 1 is inserted into the gas hole to be treated, and serves as the basic anti-leakage component of the entire coal mine gas extraction and anti-leakage device. Its main function is to provide preliminary physical isolation to prevent untreated gas from escaping directly to the external environment. Specifically, the sealing cylinder 1 is a hollow cylindrical structure, and a guide screw 13 is arranged along its axial direction, and a plugging assembly for plugging the gas hole is slidably arranged on the guide screw 13. The first motor 12 is arranged at the top of the sealing cylinder 1 away from the gas hole, and its output end is fixedly connected to the guide screw 13, and the lifting block 3 is slidably arranged on the guide screw 13, and the lifting rod 3 is threadedly connected to the guide screw 13. When the first motor 12 is started, it can drive the guide screw 13 to rotate, thereby prompting the lifting block 3 to move axially along the sealing cylinder 1.

[0040] The lifting block 3 is constructed as a four-sided truncated pyramid, the area of ​​the upper surface of which is larger than that of the lower surface, and the side surfaces thereof gradually shrink into the sealing cylinder 1 in the direction close to the gas hole. In order to ensure that the lifting block 3 moves smoothly and accurately in the sealing cylinder 1, a plurality of guide posts 31 extending along the radial direction of the sealing cylinder 1 are provided on the upper surface of the lifting block 3, preferably 4 guide posts 31 are arranged along the diagonal direction of the upper surface of the lifting block 3, and correspondingly, a plurality of guide grooves 101 cooperating with the guide posts 31 are provided on the inner wall of the sealing cylinder 1, and the guide grooves 101 extend along the axial direction of the sealing cylinder 1, and the guide posts 31 are slidably arranged in the guide grooves 101. When the lifting block 3 moves along the axial direction of the sealing cylinder 1, the guide posts 31 slide in the guide grooves 101, so that the lifting block 3 can be stably lifted and lowered in the sealing cylinder 1.

[0041] Further, refer to Figure 3 , Figure 4 , Figure 5 As shown, a guide chute 301 is provided on the side of the lifting block 3, and a plurality of gas blocking components are slidably arranged in the guide chute 301. As the lifting block 3 moves downward, the gas blocking components are gradually released to completely close the air flow passage of the gas hole.

[0042] Specifically, the gas plugging assembly includes a mounting block 4 fixed on the inner wall of the sealing cylinder 1 and a push rod 5 radially slidingly arranged in the mounting block 4 along the sealing cylinder 1. One end of the push rod 5 is bent upward to form a guide block 51 and inserted into the guide chute 301. The inclination angle of the guide block 51 matches the inclination angle of the guide chute 301, so that the guide block 51 can slide smoothly in the guide chute 301. The other end of the push rod 5 extends radially outward along the sealing cylinder 1 through the mounting block 4 and finally passes through the side wall of the sealing cylinder 1, and an expandable expansion ring 6 is arranged at the end. Furthermore, the mounting block 4 is fixed between two adjacent lifting grooves 101 on the inner wall of the sealing cylinder 1 to correspond to the position of the guide chute 301 on the side of the lifting block 3. The expansion ring 6 is an arc as a whole, and an airbag groove 601 is opened along its circumference, and the airbag 61 is installed in the airbag groove 601. The expansion rings 6 of the multiple gas blocking assemblies are combined to form a circular ring with multiple breakpoints, and the gaps between the expansion rings 6 are filled by the inflated air bags 61 in the expansion rings 6 .

[0043] The mounting block 4 is provided with a gas concentration sensor 41 and an air pump 42. The outlet of the air pump 42 is connected with an air guide tube 43. The air guide tube 43 is embedded in the push rod 53 and extends to the air bag groove 601 to communicate with the air bag 61, so as to inflate the air bag 61 and expand it, or extract the air in the air bag 61 to compress it. The air bag 61 is flexibly attached to the inner wall of the gas hole. Even if there are tiny protrusions or cracks on the inner wall of the gas hole, the air bag 61 filled with high-pressure gas can fully adapt to the inner wall of the gas hole, thereby completely blocking the gas hole.

[0044] When using the coal mine gas extraction and leakage prevention device of the present invention, first insert the sealing cylinder 1 into the gas hole, and start the first motor 12 to drive the guide screw 13 to rotate, so that the lifting block 3 moves downward. In the initial state, the guide block 51 of the push rod 5 is located at the bottom of the guide chute 301 of the lifting rod 3, the expansion ring 6 is located in the wall of the guide cylinder 1, and the airbag 61 is contracted in the airbag groove 601. As the lifting block 3 moves downward, the guide block 51 moves upward along the guide chute 301, so that the push rod 5 is pushed out, and the expansion ring 6 moves outward and abuts against the inner wall of the gas hole. When the gas concentration sensor 41 detects that the gas concentration in the gas hole exceeds the preset safety threshold, it immediately triggers an alarm and automatically activates the air pump 42 above the mounting block 4, and injects compressed air into the airbag 61 through the air guide tube 43, causing it to expand rapidly. After the airbag 61 expands, it is tightly attached to the gas hole, completely closing the air flow channel of the gas hole.

[0045] In some optional embodiments, a limit baffle 52 is provided near the guide block 51 of the push rod 5, and a spring 53 is sleeved between the limit baffle 52 and the mounting block 4. When the push rod 5 is extended, the spring 53 is compressed, which not only helps to keep the push rod 5 in a proper tension state, but also enables the expansion ring 6 to have a certain elastic buffering capacity, so that it can have better adaptability in the process of contacting with the inner wall of the gas hole.

[0046] In some optional embodiments, the gas blocking assembly is disposed at the lower portion of the sealing cylinder 1 .

[0047] Further, refer to Figure 2 , Figure 6 , Figure 7 , Figure 8 As shown, the sealing sleeve 2 is sleeved in the middle of the sealing cylinder 1, the cylinder of the sealing cylinder 1 located below the sealing sleeve 2 is inserted into the gas hole, and the sealing sleeve 2 covers the gas hole. A gas absorption component is arranged in the sealing sleeve 2 to prevent gas from flowing out of the gas hole from the lower part of the sealing cylinder 1. The lower surface of the sealing sleeve 2 is configured as a filter screen 21 to effectively prevent larger particles from entering the interior of the device and causing wear or damage to the components.

[0048] Specifically, the sealing sleeve 2 is a hollow sleeve, and the gas absorption component is arranged on the surface of the sealing cylinder 1 in a manner of sliding along the circumferential direction of the sealing sleeve 2. The gas absorption component mainly includes a rotating ring 14 and a plurality of absorption plates 17 arranged on the rotating ring 14. The rotating ring 14 is sleeved on the surface of the sealing cylinder 1 and is located near the upper surface of the sealing sleeve 2. It is configured to rotate around the sealing cylinder 1 as the center, and the plurality of absorption plates 17 rotate around the sealing cylinder 1 with the rotating ring 14. Further, a second motor 24 is arranged on the upper surface of the sealing sleeve 2, and the output end of the second motor 24 penetrates downward into the sealing sleeve 2, and a transmission gear 26 is fixed at the end thereof. A plurality of tooth blocks 15 cooperating with the transmission gear 26 are arranged on the surface of the rotating ring 14. When the second motor 24 drives the transmission gear 26 to rotate, the transmission gear 26 meshes with the tooth block 15 to drive the rotating ring 14 to rotate, thereby driving the plurality of absorption plates 17 to rotate around the sealing cylinder 1 in the sealing sleeve 2.

[0049] Furthermore, a Z-shaped connecting rod 16 is rotatably provided on the side of the adsorption plate 17 close to the sealing tube 1, and the adsorption plate 17 is connected to the rotating ring 14 through the connecting rod 16. A guide slide bar 18 is fixedly provided on the side of the adsorption plate 17 close to the side wall of the sealing sleeve 2, and a guide ring groove 201 matching the guide slide bar 18 is provided on the side wall of the sealing sleeve 2. The guide slide bar 18 rolls in the guide ring groove 201, so that the adsorption plate 17 can stably move along the circumference of the sealing sleeve 2 and rotate around the connecting rod 16 at the same time. Even if a small amount of gas overflows the orifice, it can be captured and absorbed by the adsorption plate 17 that constantly changes its position, thereby improving the sealing effect.

[0050] In some optional embodiments, in order to further ensure the connection stability between the adsorption plate 17 and the guide ring groove 201 of the sealing sleeve 2 and the rotation stability of the adsorption plate 17, an inner bevel gear 23 is provided at the opening of the guide ring groove 201, and a bevel gear 19 matching the inner bevel gear 23 is provided at the end of the guide slide bar 18. When the guide slide bar 18 slides along the guide ring groove 201, the bevel gear 19 meshes with the inner bevel gear 23, thereby ensuring the rotation stability of the adsorption plate 17, further increasing the chance of the adsorption plate 17 contacting with the gas, and improving the adsorption efficiency.

[0051] In some optional embodiments, a receiving ring groove 102 is provided at the lower portion of the outer surface of the sealing cylinder 1, and the expansion ring 6 is initially received in the receiving ring groove 102. In order to facilitate actual operation, handles 11 for easy gripping are respectively provided on both sides of the upper portion of the sealing cylinder 1. A plurality of fixing pins 22 are arranged at the bottom of the sealing sleeve 2 to enhance the gripping force of the lower portion of the sealing sleeve 2 on the surface of the gas hole, so that the leak-proof device can be firmly fixed in the gas hole.

[0052] In summary, the present invention provides a coal mine gas extraction leakage prevention device, which is inserted into the gas hole through the sealing tube 1 and covered on the gas hole through the sealing sleeve 2, thereby realizing effective sealing of the gas hole. The present invention forms a dynamic sealing system through the gas blocking component and the gas absorption component. The gas blocking component can adapt to gas holes of different sizes, which not only improves the flexibility of the seal, but also ensures the reliability of the seal, and further reduces the possibility of gas leakage. The gas absorption component can adsorb and remove the residual gas around the gas hole, further reducing the risk of gas leakage and improving safety. The gas blocking component and the gas absorption component can effectively prevent gas from leaking from the hole mouth and reduce the gas concentration, which is of great significance for reducing safety risks such as gas explosions.

[0053] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution, which should be included in the scope of the claims of the present invention.

Claims

1. A coal mine gas extraction leakage prevention device, characterized in that: It comprises a sealing cylinder (1) and a sealing sleeve (2) sleeved on the sealing cylinder (1), wherein the sealing cylinder (1) is inserted into the gas hole, and the sealing sleeve (2) covers the opening of the gas hole; wherein: A plurality of arc-shaped expansion rings (6) are arranged on the side wall of the sealing cylinder (1) inserted into the gas hole, and the expansion ring (6) is constructed to move from a first position to a second position along the radial direction of the sealing cylinder (1), wherein, in the first position, the expansion ring (6) is embedded in the side wall of the sealing cylinder (1); and in the second position, the expansion ring (6) is pressed against the hole wall of the gas hole to seal the gas hole.

2. The coal mine gas extraction leakage prevention device according to claim 1, characterized in that: The sealing cylinder (1) is provided with a lifting block (3) which is lifted and lowered along the axial direction of the sealing cylinder (1); each of the expansion rings (6) is connected to the lifting block (3) via a push rod (5); a mounting block (4) is fixedly arranged on the inner wall of the sealing cylinder (1); and the push rod (5) is slidably arranged in the mounting block (4); wherein: The side surface of the lifting block (3) is constructed to be inclined toward the center of the sealing cylinder (1) in a direction close to the gas hole; one end of the push rod (5) is slidably connected to the side surface of the lifting block (3), and the other end passes through the sealing cylinder (1) and is fixedly connected to the expansion ring (6); the lifting block (3) descends to push the push rod (5) to move outside the sealing cylinder (1), thereby driving the expansion ring (6) to move from the first position to the second position along the radial direction of the sealing cylinder (1).

3. The coal mine gas extraction leakage prevention device according to claim 2, characterized in that: The expansion ring (6) is provided with an airbag groove (601), and the airbag (61) is received in the airbag groove (601).

4. A coal mine gas extraction leakage prevention device according to claim 3, characterized in that: An air pump (42) is provided on the mounting block (4), and an air guide tube (43) of the air pump (42) is embedded in the push rod (5) and penetrates into the expansion ring (6) along the push rod (5) to communicate with the air bag (61), so as to inflate the air bag (61) to expand it, or to extract air from the air bag (61) to compress it.

5. A coal mine gas extraction leakage prevention device according to claim 1, characterized in that: A guide screw (13) is arranged in the sealing cylinder (1) along its axial direction; a first motor (12) is arranged at the top of the sealing cylinder (1), and its output end is connected to the guide screw (13); the lifting block (3) is slidably arranged on the guide screw (13).

6. The coal mine gas extraction leakage prevention device according to claim 2, characterized in that: The lifting block (3) is a truncated pyramid, and its side surface is constructed to be inclined toward the center of the sealing cylinder (1) in a direction close to the gas hole; each side surface of the lifting block (3) is provided with a guide inclined groove (301), and the push rod (5) is slidably arranged in the guide inclined groove (301).

7. The coal mine gas extraction leakage prevention device according to claim 1, characterized in that: The sealing sleeve (2) is a hollow sleeve, the lower surface of which is configured as a filter screen (21); a plurality of adsorption plates (17) are arranged in the sealing sleeve (2) in a manner of circumferential movement along the sealing sleeve (2) to absorb gas overflowing from the orifice of the gas hole.

8. The coal mine gas extraction leakage prevention device according to claim 7, characterized in that: The rotating ring (14) is sleeved on the surface of the sealing cylinder (1) and is located inside the sealing sleeve (2), and is configured to rotate around the sealing cylinder (1); a second motor (24) is provided on the upper surface of the sealing sleeve (2), the output end of the second motor (24) penetrates into the sealing sleeve (2), and a transmission gear (26) is fixedly provided on the output end of the second motor (24); a plurality of tooth blocks (15) meshing with the transmission gear (26) are provided on the rotating ring (14), and a plurality of adsorption plates (17) are provided on the rotating ring (14); the second motor (24) drives the rotating ring (14) to rotate, thereby driving the adsorption plates (17) to move along the circumferential direction of the sealing sleeve (2).

9. The coal mine gas extraction leakage prevention device according to claim 8, characterized in that: A connecting rod (16) is rotatably provided on the side of the adsorption plate (17) close to the sealing tube (1), and the adsorption plate (17) is connected to the rotating ring (14) through the connecting rod (16); a guide slide bar (18) is fixedly provided on the side of the adsorption plate (17) close to the side wall of the sealing sleeve (2), and a guide slide groove matching with the guide slide bar (18) is provided on the side wall of the sealing sleeve (2); the rotating ring (14) drives the adsorption plate (17) to move circumferentially along the sealing sleeve (2), and the guide slide bar (18) rolls in the guide ring groove (102) to drive the adsorption plate (17) to rotate around the connecting rod (16).

10. A coal mine gas extraction leakage prevention device according to claim 9, characterized in that: An inner bevel gear (23) is arranged at the notch of the guide ring groove (102), and a bevel gear (19) meshing with the inner bevel gear (23) is arranged at the end of the guide slide rod (18).

Images