Well sealing device for abandoned mine

Abstract

The utility model relates to the technical field of mines, and discloses a waste mine shut-in device which is installed in a mine arranged above a floor, the bottom end of the mine penetrates to the position below the floor, an annular sealing groove is formed in the top end of the mine, and the device comprises an annular sealing ring which is connected in the annular sealing groove in a clamped mode. The top end of the annular sealing ring is fixedly connected with a rubber inner cover, the outer surface of the rubber inner cover is fixedly connected with a well sealing cover, and the inner wall of the mine is fixedly connected with three first rubber rings. The outer side of the annular sealing ring is tightly embedded into the groove of the annular sealing groove, the inner side of the annular sealing ring extends upwards to be attached to the bottom face of the rubber inner cover, and when the well sealing cover is pressed downwards, the annular sealing ring is extruded to generate elastic deformation to fill a tiny gap between the top end of a mine and the rubber inner cover, and underground water is effectively prevented from leaking from the edge of a well mouth.

Description

Technical Field

[0001] This utility model relates to the field of mining technology, and more specifically, to a sealing device for abandoned mines. Background Technology

[0002] A mine is a general term for the underground passages and related chambers that are excavated to connect the surface and the ore body for the purpose of mining underground mineral resources. It is an important infrastructure for mineral resource development. When a mine is depleted or needs to be shut down due to safety, environmental or other factors, the abandoned mine must be sealed to prevent groundwater leakage, the escape of harmful gases, avoid geological disasters and environmental pollution, and protect the surrounding ecology and personnel safety.

[0003] In existing abandoned mine sealing operations, commonly used sealing devices mostly employ simple concrete pouring or single mechanical sealing structures. For example, some devices rely solely on bolted metal sealing plates for sealing. Due to long-term geological activity and erosion from residual media within the mine, the metal sealing plates are prone to rust and sealing failure. Furthermore, the shape of the mine opening may undergo slight deformation due to geological subsidence, making it difficult for a single rigid sealing structure to adapt to such deformation. This results in gaps remaining after sealing, failing to effectively prevent the infiltration and leakage of groundwater and gas, thus affecting the long-term reliability and environmental protection effects of the sealing operation. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] In view of the above situation and to overcome the defects of the prior art, this utility model provides an abandoned mine sealing device, which aims to solve the problems in the background art.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, this application provides the following technical solution: an abandoned mine shaft sealing device, wherein the device is installed in a mine shaft located above the floor, wherein the bottom end of the mine shaft extends to below the floor, and an annular sealing groove is provided at the top end of the mine shaft, the device includes an annular sealing ring, which is snapped into the annular sealing groove, a rubber inner cover is fixedly connected to the top end of the annular sealing ring, a shaft sealing cover is fixedly connected to the outer surface of the rubber inner cover, three first rubber rings are fixedly connected to the inner wall of the mine shaft, a rubber filling block is fixedly connected to the bottom surface of the rubber inner cover, the inner wall of each first rubber ring is in contact with the outer surface of the rubber filling block, and a fixing hanging ring is fixedly connected to the top end of the shaft sealing cover.

[0008] The present invention is further configured such that a second rubber ring and a third rubber ring are fixedly connected to the inner wall of the rubber inner cover, four first infrared methane sensors are fixedly connected to the inner wall of the second rubber ring, and four second infrared methane sensors are fixedly connected to the bottom surface of the third rubber ring. The inner walls of the second rubber ring and the third rubber ring are both in contact with the outer surface of the mine.

[0009] The present invention is further configured such that a fourth rubber ring and a spiral reducing seat are fixedly connected to the bottom surface of the second rubber ring and the upper surface of the third rubber ring, respectively. The inner wall of the fourth rubber ring and the outer surface of the spiral reducing seat are in contact with the outer surface of the mine. The bottom of the fourth rubber ring, the top of the spiral reducing seat, the outer side of the mine and the inside of the rubber inner cover together form a spiral reducing sealing cavity.

[0010] The present invention is further configured such that a connecting pipe is fixedly connected to the inner wall of the spiral decreasing seat, one end of the connecting pipe passes through the rubber inner cover and extends to the outside of the well cover, a reinforcing ring is fixedly connected to the outer surface of the connecting pipe, the outer surface of the reinforcing ring is fixedly connected to the outer surface of the spiral decreasing seat, and a joint is spirally connected to the outer surface of the connecting pipe.

[0011] The present invention is further configured such that a storage box is fixedly connected to the upper surface of the floor, a liquid polysulfide rubber tank is fixedly connected to the inner wall of the storage box, a screw pump is fixedly connected to the upper surface of the liquid polysulfide rubber tank, the input end of the screw pump extends into the interior of the liquid polysulfide rubber tank, and the output end of the screw pump is fixedly connected to a connecting pipe. The end of the connecting pipe away from the screw pump extends to the outside of the storage box and is threadedly connected to the inner wall of the connector.

[0012] The present invention is further configured such that a controller is fixedly connected to the left side of the storage tank, an injection pipe is fixedly connected to the top of the liquid polysulfide rubber tank, one end of the injection pipe extends through to the top of the storage tank, and the controller is electrically connected to the screw pump, the first infrared methane sensor and the second infrared methane sensor respectively through wires.

[0013] (III) Beneficial Effects

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] 1. Through the snap-fit ​​structure of the annular sealing groove and the annular sealing ring, a basic sealing layer can be formed at the top of the mine. The annular sealing ring is made of elastic rubber. Its outer side is tightly embedded in the groove of the annular sealing groove, and its inner side extends upward to fit against the bottom surface of the rubber inner cover. When the well cover is pressed down, the annular sealing ring is squeezed and generates elastic deformation, filling the tiny gaps between the top of the mine and the rubber inner cover, effectively preventing groundwater from seeping from the edge of the well. At the same time, the rubber filling block on the bottom surface of the rubber inner cover and the matching structure of the three first rubber rings on the inner wall of the mine form a multi-layer sealing protection. The rubber filling block is truncated cone-shaped. When it is inserted into the mine, the three first rubber rings are tightly clamped to the outside of the rubber filling block by their own elasticity. Through the interference fit, the gas leakage channel is further blocked. The mine is sealed by the double sealing inside and outside, which can effectively adapt to the slight deformation of the mine caused by geological subsidence, avoid the gap problem caused by deformation of the traditional single rigid sealing structure, and improve the long-term sealing reliability of the well sealing device.

[0016] 2. The fourth and third rubber rings on the inner wall of the rubber inner cover are interference-fitted onto the outside of the mine shaft. Together with the upper part of the spiral decreasing seat, they form a spiral decreasing sealing cavity. This cavity utilizes the structural characteristics of the spiral channel to provide a regular channel for the filling of liquid polysulfide rubber, ensuring that the rubber material is evenly distributed to the sealing gap during injection. Four first infrared methane sensors installed on the inner wall of the second rubber ring are arranged horizontally circumferentially to monitor the gas concentration in the horizontal direction outside the mine shaft in real time. Four second infrared methane sensors on the bottom surface of the third rubber ring are distributed vertically downward to monitor gas leakage in the vertical direction at the top of the mine shaft, forming a multi-directional gas concentration monitoring system. When any sensor detects that the methane concentration exceeds the threshold, the controller immediately starts the screw pump, injecting the sealant from the liquid polysulfide rubber tank into the spiral decreasing sealing cavity through the connecting pipe. The liquid sealant, aided by the pressure of the screw pump, fills the gap between the outer wall of the mine and the inner rubber cover along the spiral channel. The guiding effect of the spiral channel ensures that the sealant covers the entire circumferential sealing surface. After the sealant cures, it forms a continuous sealing layer in the leak area, which can quickly respond to and repair the area where the seal has failed, avoiding the risk of explosion or environmental pollution caused by the leakage of harmful gases. Tests have shown that this mechanism can complete the leak response and sealing compensation within seconds, effectively improving the long-term sealing reliability and environmental safety of the well sealing device. Attached Figure Description

[0017] Figure 1 This is a three-dimensional overall structural diagram of the present invention;

[0018] Figure 2 This is a three-dimensional sectional view of the manhole cover of this utility model;

[0019] Figure 3 This is a three-dimensional structural diagram of the annular sealing groove of this utility model;

[0020] Figure 4 This is a three-dimensional structural diagram of the liquid polysulfide rubber tank of this utility model;

[0021] Figure 5 This is a three-dimensional cross-sectional view of the second rubber ring of this utility model;

[0022] Figure 6 This is a three-dimensional cross-sectional view of the rubber filler block of this utility model;

[0023] Figure 7 This is a three-dimensional structural diagram of the first infrared methane sensor of this utility model;

[0024] Figure 8 This is a three-dimensional structural diagram of the spiral decreasing seat of this utility model.

[0025] In the diagram: 1. Floor; 2. Well cover; 3. Fixing ring; 4. Connecting pipe; 5. Injection pipe; 6. Controller; 7. Storage tank; 8. Connector; 9. Mine shaft; 10. Rubber inner cover; 11. Connecting pipe; 12. Third rubber ring; 13. Spiral decreasing seat; 14. Fourth rubber ring; 15. Second rubber ring; 16. First rubber ring; 17. Annular sealing groove; 18. Liquid polysulfide rubber tank; 19. Screw pump; 20. First infrared methane sensor; 21. Second infrared methane sensor; 22. Rubber filler block; 23. Annular sealing ring; 24. Reinforcing ring. Detailed Implementation

[0026] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0027] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0028] In this utility model, unless otherwise stated, the orientations used, such as "up" and "down", usually refer to the direction shown in the accompanying drawings, or to the vertical, perpendicular, or gravitational direction; similarly, for ease of understanding and description, "left" and "right" usually refer to the left and right shown in the accompanying drawings; "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not used to limit this utility model.

[0029] Please see Figures 1-8The device is installed in a mine shaft 9 located above the floor 1. The bottom of the mine shaft 9 extends to the bottom of the floor 1, and the top of the mine shaft 9 has an annular sealing groove 17. The device includes an annular sealing ring 23, which is snapped into the annular sealing groove 17. A rubber inner cover 10 is fixedly connected to the top of the annular sealing ring 23. A well cover 2 is fixedly connected to the outer surface of the rubber inner cover 10. Three first rubber rings 16 are fixedly connected to the inner wall of the mine shaft 9. A rubber filling block 22 is fixedly connected to the bottom surface of the rubber inner cover 10. The inner wall of each first rubber ring 16 is in contact with the outer surface of the rubber filling block 22. A fixing hanging ring 3 is fixedly connected to the top of the well cover 2.

[0030] Specifically, the mine shaft 9 is supported by the floor 1, and the mine shaft 9 forms a channel through the floor 1. The annular sealing groove 17 at the top of the shaft 9 engages with the annular sealing ring 23. The annular sealing ring 23 is connected to the rubber inner cover 10, and the rubber inner cover 10 fixes the well cover 2. The three first rubber rings 16 on the inner wall of the mine shaft 9 contact the rubber filling block 22 on the bottom surface of the rubber inner cover 10. The fixing hanging ring 3 at the top of the well cover 2 is used for hoisting. During installation, the well cover 2 is pressed down, which moves the rubber inner cover 10 to compress and deform the annular sealing ring 23 to fill the gap in the annular sealing groove 17. The rubber filling block 22 is inserted into the mine shaft 9 and is press-fitted with the three first rubber rings 16 to form a double elastic seal inside and outside. This seal adapts to the slight deformation of the mine shaft 9 caused by geological subsidence, prevents groundwater from seeping from the edge of the well and prevents harmful gases from escaping, solves the problem of gaps caused by deformation in traditional single rigid sealing structures, and improves the long-term sealing reliability of the well sealing device.

[0031] Please see Figures 1-8 The inner wall of the rubber inner cover 10 is fixedly connected to a second rubber ring 15 and a third rubber ring 12. The inner wall of the second rubber ring 15 is fixedly connected to four first infrared methane sensors 20, and the bottom surface of the third rubber ring 12 is fixedly connected to four second infrared methane sensors 21. The inner walls of the second rubber ring 15 and the third rubber ring 12 are in contact with the outer surface of the mine shaft 9.

[0032] Specifically, the second rubber ring 15 and the third rubber ring 12 on the inner wall of the rubber inner cover 10 are fitted onto the outside of the mine shaft 9. The four first infrared methane sensors 20 on the inner wall of the second rubber ring 15 are arranged horizontally around the periphery to monitor the gas concentration in the horizontal direction outside the mine shaft 9 in real time. The four second infrared methane sensors 21 on the bottom surface of the third rubber ring 12 are arranged vertically downward to monitor the gas concentration in the vertical direction at the bottom of the mine shaft 9. When methane or other harmful gases leak around the mine shaft 9, the sensors capture the gas concentration change through the infrared detection principle and transmit an electrical signal to the controller 6, realizing multi-directional real-time monitoring, timely detection of potential leaks, and solving the problem that traditional devices cannot actively monitor gas leaks.

[0033] Please see Figures 1-8The bottom surface of the second rubber ring 15 and the upper surface of the third rubber ring 12 are respectively fixedly connected to the fourth rubber ring 14 and the spiral decreasing seat 13. The inner wall of the fourth rubber ring 14 and the outer surface of the spiral decreasing seat 13 are in contact with the outer surface of the mine 9. The bottom of the fourth rubber ring 14, the top of the spiral decreasing seat 13, the outer side of the mine 9 and the inside of the rubber inner cover 10 together form a spiral decreasing sealing cavity.

[0034] Specifically, the spiral decreasing seat 13 on the upper surface of the fourth rubber ring 14 and the third rubber ring 12 on the bottom surface of the second rubber ring 15, together with the outer side of the mine 9 and the inside of the rubber inner cover 10, forms a spiral decreasing sealing cavity. The fourth rubber ring 14 and the spiral decreasing seat 13 are in interference contact with the outer surface of the mine 9 to form a sealing boundary. The spiral channel of the spiral decreasing sealing cavity has a gradually changing structure with a wider top and a narrower bottom. When gas leaks, the leaked gas forms a directional flow path in the spiral channel, while providing a regular channel for the subsequent injection of liquid polysulfide rubber. This ensures that the rubber material can evenly cover the sealing gap between the outer wall of the mine 9 and the rubber inner cover 10 along the spiral trajectory when injected, solving the problem of inaccurate filling and sealing after leakage in traditional devices and improving the effectiveness of sealing compensation.

[0035] Please see Figures 1-8 A connecting pipe 11 is fixedly connected to the inner wall of the spiral decreasing seat 13. One end of the connecting pipe 11 passes through the rubber inner cover 10 and extends to the outside of the well cover 2. A reinforcing ring 24 is fixedly connected to the outer surface of the connecting pipe 11. The outer surface of the reinforcing ring 24 is fixedly connected to the outer surface of the spiral decreasing seat 13. A connector 8 is spirally connected to the outer surface of the connecting pipe 11.

[0036] Specifically, the connecting pipe 11 on the inner wall of the spiral reducing seat 13 extends through the rubber inner cover 10 to the outside of the well cover 2. The reinforcing ring 24 on the outer surface of the connecting pipe 11 is fixedly connected to the spiral reducing seat 13 to enhance the connection strength. The outer surface of the connecting pipe 11 is connected to the threaded joint 8. The connecting pipe 11 serves as a transmission channel for liquid polysulfide rubber. When sealing compensation is required, the joint 8 is threadedly connected to the connecting pipe 4. The screw pump 19 drives the liquid rubber material to be injected into the spiral reducing sealing cavity through the connecting pipe 11. The reinforcing ring 24 prevents the connection between the connecting pipe 11 and the spiral reducing seat 13 from falling off during rubber injection, solving the problem of inaccurate delivery of rubber material during sealing compensation in traditional devices and ensuring the feasibility of sealing compensation.

[0037] Please see Figures 1-8A storage tank 7 is fixedly connected to the upper surface of the floor 1. A liquid polysulfide rubber tank 18 is fixedly connected to the inner wall of the storage tank 7. A screw pump 19 is fixedly connected to the upper surface of the liquid polysulfide rubber tank 18. The input end of the screw pump 19 extends into the interior of the liquid polysulfide rubber tank 18. A connecting pipe 4 is fixedly connected to the output end of the screw pump 19. The end of the connecting pipe 4 away from the screw pump 19 extends to the outside of the storage tank 7 and is threadedly connected to the inner wall of the connector 8. A controller 6 is fixedly connected to the left side of the storage tank 7. An injection pipe 5 is fixedly connected to the top of the liquid polysulfide rubber tank 18. One end of the injection pipe 5 extends to the top of the storage tank 7. The controller 6 is electrically connected to the screw pump 19, the first infrared methane sensor 20, and the second infrared methane sensor 21 via wires.

[0038] Specifically, a liquid polysulfide rubber tank 18 is placed in the storage box 7 on the floor 1. The input end of the screw pump 19 above it is inserted into the tank, and the output end is connected to the connector 8 through the connecting pipe 4. The controller 6 on the left side of the storage box 7 is electrically connected to the screw pump 19, the first infrared methane sensor 20, and the second infrared methane sensor 21. The injection pipe 5 is used to replenish the liquid polysulfide rubber. When the sensor detects that the methane concentration exceeds the threshold, the controller 6 triggers the screw pump 19 to start, and the rubber material in the liquid polysulfide rubber tank 18 is pressed into the spiral decreasing sealing cavity through the connecting pipe 4 and the connecting pipe 11. The liquid rubber material fills the gaps along the spiral channel and solidifies to form a secondary sealing layer. This solves the problem that traditional devices cannot actively repair sealing failures, avoids the risk of explosion or environmental pollution caused by the leakage of harmful gases, and improves the safety and environmental protection effect of the well sealing device.

[0039] Working principle:

[0040] Mine shaft 9 is supported by floor 1, and it forms a vertically connected passage through floor 1. An annular sealing groove 17 at the top of shaft 9 holds an annular sealing ring 23. A rubber inner cover 10 is fixed to the top of the annular sealing ring 23, and a shaft cover 2 is fixed to the outer surface of the rubber inner cover 10. Three first rubber rings 16 are fixed to the inner wall of mine shaft 9, and a rubber filler block 22 is fixed to the bottom of the rubber inner cover 10. These three components form a double-elastic sealing structure through an interference fit. When the shaft cover 2 is pressed down, the annular sealing ring 23 undergoes elastic deformation under pressure, tightly filling the gaps in the annular sealing groove 17. Simultaneously, the rubber filler block 22 is inserted into mine shaft 9 and tightly fits the three first rubber rings 16. The elastic deformation of the rubber material adapts to the slight deformation of mine shaft 9 caused by geological subsidence, effectively preventing... Groundwater seepage from the wellhead edge and the escape of harmful gases solve the problem of gaps caused by deformation in traditional single rigid sealing structures, improving the long-term sealing reliability of the well sealing device. A second rubber ring 15 and a third rubber ring 12, fixed to the inner wall of the rubber inner cover 10, are fitted onto the outside of the mine 9. Four first infrared methane sensors 20 arranged horizontally circumferentially are fixed to the inner wall of the second rubber ring 15, and four second infrared methane sensors 21 arranged vertically downwards are fixed to the bottom surface of the third rubber ring 12. The sensors monitor the gas concentration in the horizontal direction outside the mine 9 and the vertical direction at the bottom of the mine 9 in real time using infrared detection principles. When methane or other harmful gases leak around the mine 9, the sensors capture the change in gas concentration and transmit the electrical signal to the controller 6, achieving multi-directional real-time monitoring. To promptly detect potential leaks and address the issue of traditional devices being unable to actively monitor gas leaks, the fourth rubber ring 14, fixed to the bottom of the second rubber ring 15, and the spiral decreasing seat 13, fixed to the upper surface of the third rubber ring 12, together with the outer side of the mine shaft 9 and the interior of the rubber inner cover 10, form a spiral decreasing sealing cavity. The fourth rubber ring 14 and the spiral decreasing seat 13 form a sealing boundary with the outer surface of the mine shaft 9 through an interference fit. The spiral channel of the spiral decreasing sealing cavity has a gradually changing structure with a wider top and a narrower bottom. When gas leaks, the leaking gas forms a directional flow path within the spiral channel, while simultaneously providing a regular channel for the subsequent injection of liquid polysulfide rubber. This ensures that the liquid polysulfide rubber can evenly cover the sealing gap between the outer wall of the mine shaft 9 and the rubber inner cover 10 along the spiral trajectory during injection, solving the problem of traditional devices... To address the issue of inaccurate sealing after equipment leakage and improve the effectiveness of sealing compensation, a connecting pipe 11 fixed to the inner wall of the spiral decreasing seat 13 extends through the rubber inner cover 10 to the outside of the well cover 2. A reinforcing ring 24 is fixed to the outer surface of the connecting pipe 11 and connected to the spiral decreasing seat 13 to enhance strength. The outer surface of the connecting pipe 11 is connected to a threaded joint 8. When sealing compensation is required, the joint 8 is threadedly connected to the connecting pipe 4. The screw pump 19 drives liquid polysulfide rubber to be injected into the spiral decreasing sealing cavity through the connecting pipe 11. The reinforcing ring 24 prevents the connection between the connecting pipe 11 and the spiral decreasing seat 13 from falling off during injection, ensuring accurate delivery of liquid polysulfide rubber to the spiral decreasing sealing cavity. This solves the problem of inaccurate rubber delivery during sealing compensation in traditional equipment and guarantees the feasibility of sealing compensation.A liquid polysulfide rubber tank 18 is placed inside a storage tank 7 on floor 1. The input end of a screw pump 19 above it is inserted into the tank, and its output end is connected to a connector 8 via a connecting pipe 4. A controller 6 on the left side of the storage tank 7 is electrically connected to the screw pump 19, a first infrared methane sensor 20, and a second infrared methane sensor 21. An injection pipe 5 is used to replenish the liquid polysulfide rubber. When the first infrared methane sensor 20 or the second infrared methane sensor 21 detects that the methane concentration exceeds a preset threshold, the controller 6 triggers the screw pump 19 to start, pressing the rubber material in the liquid polysulfide rubber tank 18 into the spiral decreasing sealing cavity through the connecting pipe 4 and connecting pipe 11. The liquid rubber material fills the gaps along the spiral channel and solidifies, forming a secondary sealing layer. This responds to leaks and completes sealing repair in a short time, solving the problem that traditional devices cannot actively repair sealing failures, avoiding the risk of explosion or environmental pollution caused by harmful gas leaks, and improving the safety and environmental protection effect of the well sealing device.

[0041] Of all the solutions mentioned above, those involving the connection between two components can be selected according to the actual situation, such as welding, bolt and nut connection, bolt or screw connection, or other known connection methods, which will not be elaborated here. For all the fixed connections mentioned above, welding is preferred. Although embodiments of this utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this utility model. The scope of this utility model is defined by the appended claims and their equivalents.

Claims

1. A sealing device for abandoned mine shafts, characterized in that: The device is installed in a mine shaft (9) above the floor (1). The bottom of the mine shaft (9) extends to the floor (1). An annular sealing groove (17) is provided at the top of the mine shaft (9). The device includes an annular sealing ring (23) which is snapped into the annular sealing groove (17). A rubber inner cover (10) is fixedly connected to the top of the annular sealing ring (23). A well cover (2) is fixedly connected to the outer surface of the rubber inner cover (10). Three first rubber rings (16) are fixedly connected to the inner wall of the mine shaft (9). A rubber filling block (22) is fixedly connected to the bottom surface of the rubber inner cover (10). The inner wall of each first rubber ring (16) is in contact with the outer surface of the rubber filling block (22). A fixed hanging ring (3) is fixedly connected to the top of the well cover (2).

2. The abandoned mine shaft sealing device according to claim 1, characterized in that: The inner wall of the rubber inner cover (10) is fixedly connected to a second rubber ring (15) and a third rubber ring (12). The inner wall of the second rubber ring (15) is fixedly connected to four first infrared methane sensors (20). The bottom surface of the third rubber ring (12) is fixedly connected to four second infrared methane sensors (21). The inner walls of the second rubber ring (15) and the third rubber ring (12) are in contact with the outer surface of the mine (9).

3. The abandoned mine shaft sealing device according to claim 2, characterized in that: The bottom surface of the second rubber ring (15) and the upper surface of the third rubber ring (12) are respectively fixedly connected to the fourth rubber ring (14) and the spiral decreasing seat (13). The inner wall of the fourth rubber ring (14) and the outer surface of the spiral decreasing seat (13) are in contact with the outer surface of the mine (9). The bottom of the fourth rubber ring (14), the top of the spiral decreasing seat (13), the outer side of the mine (9) and the inside of the rubber inner cover (10) together form a spiral decreasing sealing cavity.

4. The abandoned mine shaft sealing device according to claim 3, characterized in that: The inner wall of the spiral decreasing seat (13) is fixedly connected to a connecting pipe (11). One end of the connecting pipe (11) passes through the rubber inner cover (10) and extends to the outside of the well cover (2). A reinforcing ring (24) is fixedly connected to the outer surface of the connecting pipe (11). The outer surface of the reinforcing ring (24) is fixedly connected to the outer surface of the spiral decreasing seat (13). A joint (8) is spirally connected to the outer surface of the connecting pipe (11).

5. The abandoned mine shaft sealing device according to claim 4, characterized in that: A storage tank (7) is fixedly connected to the upper surface of the floor (1). A liquid polysulfide rubber tank (18) is fixedly connected to the inner wall of the storage tank (7). A screw pump (19) is fixedly connected to the upper surface of the liquid polysulfide rubber tank (18). The input end of the screw pump (19) extends into the interior of the liquid polysulfide rubber tank (18). The output end of the screw pump (19) is fixedly connected to a connecting pipe (4). The end of the connecting pipe (4) away from the screw pump (19) extends into the outside of the storage tank (7) and is threadedly connected to the inner wall of the connector (8).

6. The abandoned mine shaft sealing device according to claim 5, characterized in that: A controller (6) is fixedly connected to the left side of the storage tank (7), and an injection pipe (5) is fixedly connected to the top of the liquid polysulfide rubber tank (18). One end of the injection pipe (5) extends through to the top of the storage tank (7). The controller (6) is electrically connected to the screw pump (19), the first infrared methane sensor (20), and the second infrared methane sensor (21) through wires.

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