Electromagnetic recyclable gas extraction borehole sealing device and use method

Abstract

The application discloses an electromagnetic recyclable gas extraction drilling hole sealing device and a use method thereof. The device comprises a gas extraction pipe sleeved with an electromagnetic sealing bag, a grouting protection device is sleeved outside the electromagnetic sealing bag, a material injection pipe is wrapped on the grouting protection device, and the electromagnetic sealing bag is connected with a circuit. After power-on, opposite magnetism is obtained between the magnetic ring bodies, the adjacent magnetic ring bodies are attracted to each other, the sealing bag becomes round from a long strip, and then the sealing bag is supported to the drilling hole wall surface, the sealing of the drilling hole is completed, the gas extraction operation is performed after material injection is completed, the circuit is disconnected when the gas concentration is lower than 4%, the electromagnetic sealing bag returns to the original shape, the short and thick bag is controlled to discharge high-pressure energy, and the volume of the bag is reduced, and then the gas extraction pipe sleeved with the electromagnetic sealing bag is taken out. The application not only realizes the recyclability of the gas extraction device, but also solves the problem of the sealing bag sealing the hole not tightly, and is favorable for the promotion and development of the mine gas extraction operation.

Description

Technical Field

[0001] This invention belongs to the field of coal mine gas extraction, and particularly relates to an electromagnetic recyclable gas extraction borehole sealing device and its usage method. Background Technology

[0002] Borehole gas extraction is a crucial technical measure for coal seam outburst mitigation and a vital guarantee for ensuring safe production in underground coal mines. However, existing gas extraction and sealing devices primarily employ a "two-plug-one-injection" principle for gas extraction from boreholes. For example, the existing technology in patent application CN 218376404 U, entitled "A Gas Extraction Borehole Sealing Structure," involves sealing both ends of the borehole with two bags to form a closed area, then sealing the closed area with an injection pipe before gas extraction. The bags and the closed area are mainly filled with cement mortar, and after sealing the borehole, the entire device is buried in the coal seam, limiting its use to a single purpose. This increases the wear and tear on the gas extraction device and hinders the sustainable development of mine gas extraction operations. Furthermore, existing bag sealing devices also suffer from incomplete sealing, leading to low extraction efficiency.

[0003] Therefore, in order to solve the problems of single-use gas extraction and sealing devices and inadequate sealing of gas bags, there is an urgent need for a new type of gas extraction borehole sealing device to meet the needs of coal mine gas extraction. Summary of the Invention

[0004] The purpose of this invention is to address the problems of non-recoverable gas drainage borehole sealing devices and inadequate bag sealing in coal mines, by providing an electromagnetic recoverable gas drainage borehole sealing device and its usage method.

[0005] To solve the above problems, the present invention adopts the following technical solution:

[0006] An electromagnetic recyclable gas extraction borehole sealing device, characterized in that it comprises: an electromagnetic sealing bag, a grouting protection device, a suction pipe, a material injection pipe, and a power supply line. The electromagnetic sealing bag is composed of an outer bag and an inner magnetic ring structure. The outer bag consists of a long, thin bag in the middle and short, thick bags on both sides. The inner magnetic ring is composed of magnetic ring one, magnetic ring two, magnetic ring three, a locking body, and an elastic cloth bag connected together. Its structure matches the structure of the outer bag, including a magnetic structure one in the middle and magnetic structures two on both sides. Magnetic structure one includes magnetic ring two at both ends of the long, thin bag and two magnetic ring three symmetrically arranged at a certain distance from magnetic ring two. Magnetic structure two includes magnetic ring three located on both sides of the short, thick bag. The device comprises magnetic ring 2 and magnetic ring 1, and a locking body located in the middle of magnetic ring 2 and magnetic ring 1. Magnetic ring 2 at both ends of the long, thin bag is integrally set close to magnetic ring 2 on both sides of the short, thick bag. Each magnetic ring and locking body is connected by an elastic cloth bag. When energized, the magnetism of magnetic ring 2 is opposite to that of magnetic ring 1 and magnetic ring 3. The internal magnetic ring structure is sleeved on the suction pipe, and the inner diameter of each magnetic ring and locking body is slightly larger than the outer diameter of the suction pipe. Magnetic ring 1 and magnetic ring 2 can slide on the suction pipe, while magnetic ring 3 and the locking body are fixed on the suction pipe. The grouting isolation device is sleeved on the outside of the electromagnetic sealing bag and wraps the grouting pipe on it, which plays a role in isolating and protecting the electromagnetic sealing bag. The electromagnetic sealing bag is connected to the power supply line.

[0007] Furthermore, the magnetic ring body one and the magnetic ring body two are respectively provided with a circular ring fastening device for connecting and fastening the ports of the long thin bag and the short thick bag respectively.

[0008] Furthermore, the magnetic ring body and the locking body are provided with threads on the inner side, and threads are also provided at the corresponding positions on the outer side of the extraction tube. The magnetic ring body and the locking body are fixed on the extraction tube by thread matching.

[0009] Furthermore, the inner side of the magnetic ring body and the card slot body is divided into four symmetrical areas, one set of opposite areas is smooth, and the other set of opposite areas is threaded. The corresponding position on the outside of the extraction tube is also set with threads in the same way.

[0010] Furthermore, the short, thick bladder is equipped with a wireless smart valve, which can be remotely controlled to open and close via a wireless control device, thereby releasing the high-pressure energy from the short, thick bladder and facilitating the removal of the device.

[0011] Furthermore, the structure of the grouting isolation device matches the structure of the electromagnetic sealing bag, and consists of an isolation tube, an isolation bag one, an isolation bag two, a closing elastic band one, a closing elastic band two, a semi-circular clamp tube one, a semi-circular clamp tube two, and a long magnetic plate. The isolation tube consists of two semi-circular tubes located in the middle area of ​​the grouting isolation device, with its two ends connected to the isolation bag one and the isolation bag two, respectively. The outer ends of the isolation bag one and the isolation bag two are fitted with the closing elastic band one, and the inner ends are fitted with the closing elastic band. Second, the first elastic band can wrap the outer end of the protective bag around the air extraction pipe to prevent the protective bag from folding and falling off when the device touches the coal wall during drilling. The second elastic band can wrap the inner end of the protective bag around the protective pipe. The two ends of the semi-circular clamps are equipped with oppositely shaped long magnetic plates, which attract each other to firmly clamp the inner end of the protective bag onto the protective pipe. The joint of the two semi-circular pipes is provided with a tight-fitting groove to ensure the tightness of the protective pipe joint.

[0012] Furthermore, the length of the protective tube matches the length between the two magnetic rings, and is used to fit the portion between the two magnetic rings on the long, thin bag. The protective bag one and the protective bag two have the same structure, both consisting of the portion fitted with the short, thick bag and the portion fitted between the magnetic rings two and three on the long, thin bag.

[0013] Furthermore, the first protective bag is provided with a hole for the injection tube to pass through. After the injection tube passes through the first protective bag, it is fastened to the first protective bag by a spring clip.

[0014] Furthermore, the spring clip body is composed of a spring body, a clip body tube wall, and a core. The core is fixed at the bottom center of the clip body tube wall, and the spring body is wrapped around the core. Its two wings extend to the top of the clip body tube wall. The inner wall of the clip body tube wall is circular, with the same diameter as the outer wall of the injection tube. The upper arc surface of its outer wall is consistent with the arc surface of the inner wall of the drill hole, and the lower arc surface can achieve maximum contact area with the short, thick, drum-shaped bag, thereby ensuring good sealing of the short, thick bag to the drill hole. The spring body is located inside the clip body tube wall. After the spring clip body opens, its two wings close around the core under the elastic force of the spring clip body. All the edges and corners of the spring clip body are blunted to avoid damage to other devices.

[0015] The present invention also provides a method for using the above-mentioned electromagnetic recyclable gas extraction borehole sealing device, characterized by comprising the following steps:

[0016] a. Pass the extraction tube through each magnetic ring and locking body of the electromagnetic sealing bag. When the extraction tube passes through each magnetic ring and locking body, the smooth surface of the extraction tube should face the threaded surface of the magnetic ring and locking body. After passing through completely, when it is inserted into the appropriate position in the borehole, rotate the extraction tube so that the threaded surface of the extraction tube matches the threaded surface of the magnetic ring and locking body, thereby securing the magnetic ring and locking body to the extraction tube, and then securing the electromagnetic sealing bag to the extraction tube.

[0017] b. Pass the injection tube through the first diaphragm bag, then insert the spring clip into the first diaphragm bag, press the injection tube tightly against the outer wall of the first diaphragm bag, open the spring clip, and clamp the first diaphragm bag and the injection tube together, thereby fixing the position of the injection tube on the first diaphragm bag, making it convenient for the injection tube to be sent into the borehole together with other devices.

[0018] c. Wrap the grouting isolation device with spring clip and injection pipe around the electromagnetic sealing bag. The specific operation is as follows: put the two semi-circular tubes together, wrap the part between the two magnetic rings of the long thin bag in the middle to form the isolation tube, pass the isolation bag one and isolation bag two with spring clip and injection pipe through the short thick bag respectively, and wrap the closing rubber band one and closing rubber band two around the air extraction pipe and the opening of the isolation tube respectively. At the same time, use semi-circular clamp one and semi-circular clamp two to reinforce the inner ports of isolation bag one and isolation bag two on the isolation tube, so that the injection pipe opening is located in the grout sealing area.

[0019] d. Connect the power supply line and the electromagnetic sealing bag, and send the air extraction pipe containing the electromagnetic sealing bag and the grouting isolation device into the borehole;

[0020] e. After energization, magnetic ring 1, magnetic ring 2, and magnetic ring 3 acquire opposite magnetism, causing magnetic ring 1 to move towards magnetic ring 2 and magnetic ring 2 to move towards magnetic ring 3. This forces the long, thin bag and the short, thick bag to become round and bulging from their long strip shape. When magnetic ring 1 approaches the locking body and magnetic ring 2 approaches magnetic ring 3, the elastic band 1 wrapped around the suction pipe breaks and falls off. The outer ends of the protective bags 1 and 2 open. At this time, the electromagnetic sealing bags reach their maximum round and bulging shape, pushing the protective bags 1 and 2 against the borehole wall. The long, thin bag also pushes against the protective tube, completing the sealing of the borehole.

[0021] f. The sealing grout is delivered into the borehole sealing area through the injection pipe. The closed area formed by the electromagnetic sealing bag supporting the grouting isolation device to the inner wall of the borehole provides good conditions for pressurized grouting.

[0022] g. After the sealing grout has solidified, gas extraction operations will be carried out;

[0023] h. When the gas concentration is below 4%, disconnect the circuit connection. The magnetic rings lose their mutual attraction and, under the tension of the electromagnetic sealing bags, the magnetic rings move apart, causing the long, thin bags and the short, thick bags to return to their original shapes.

[0024] i. Operate the wireless control device to open the wireless smart valve, and the high-pressure energy in the short and thick bag will be discharged, and the volume will be reduced to make it easier for the short and thick bag to pass through the protective tube.

[0025] j. Remove the extraction pipe containing the electromagnetic sealing bag to complete the recovery of the gas extraction device.

[0026] Beneficial effects

[0027] Compared with existing technologies, this invention utilizes electromagnetic principles and a grouting isolation device, while replacing traditional grouting bags with high-pressure airbags. It cleverly combines traditional bag sealing and grouting sealing, overcoming the problem of inadequate bag sealing leading to low extraction efficiency, and solving the problem of non-recyclable sealing and extraction devices caused by grouting sealing. It can also effectively solve the problem of slurry and reduce process costs. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of the device of the present invention.

[0029] Figure 2 This is a schematic diagram of the structure of the electromagnetic sealing bag of the present invention.

[0030] Figure 3 This is a schematic diagram of the grouting isolation device of the present invention before and after being powered on.

[0031] Figure 4 This is a schematic diagram of the structure of the spring clip body of the present invention.

[0032] Figure 5 This is a schematic diagram showing the effect of the device of the present invention before and after power-on and material injection.

[0033] Figure 6 This is a schematic diagram of the magnetic ring body or the locking body of the present invention being fixed to the extraction tube.

[0034] Figure 7 This is a flowchart of the installation process of the grouting isolation device of the present invention.

[0035] In the diagram: 1. Coal seam, 2. Borehole, 3. Suction pipe, 4. Electromagnetic sealing bag, 4-1. Long, thin bag, 4-2. Short, thick bag, 4-3. Magnetic ring one, 4-4. Magnetic ring two, 4-5. Magnetic ring three, 4-6. Clamping body, 4-7. Wireless intelligent valve, 4-8. Wireless control device, 4-9. Elastic cloth bag, 5. Grouting isolation device, 5-1. Isolation pipe, 5-2. Isolation bag one, 5-3. Isolation bag two, 5-4. Closing elastic band one, 5-5. Closing elastic band two, 5-6. Semi-circular clamp one, 5-7. Semi-circular clamp two, 5-8. Long magnetic plate, 6. Injection pipe, 7. Power supply line, 8. Sealing slurry, 9. Spring clamp body, 9-1. Spring body, 9-2. Clamp body wall, 9-3. Core, 10. Thread. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0037] It should also be noted that, in order to avoid obscuring the present invention with unnecessary details, only the structures and processing steps closely related to the present invention are shown in the accompanying drawings, while other details that are not closely related to the present invention are omitted.

[0038] Example 1

[0039] like Figures 1-7As shown, this invention provides an electromagnetic recyclable gas extraction borehole sealing device, comprising: an electromagnetic sealing bag 4, a grouting protection device 5, an extraction pipe 3, a material injection pipe 6, and a power supply line 7. The electromagnetic sealing bag 4 is composed of an outer bag and an inner magnetic ring structure. The outer bag includes a long, thin bag 4-1 located in the middle and short, thick bags 4-2 located on both sides. The inner magnetic ring is composed of a magnetic ring 4-3, a magnetic ring 4-4, a magnetic ring 4-5, a locking body 4-6, and an elastic cloth bag 4-9 connected together. Its structure matches the structure of the outer bag, including a magnetic structure 1 located in the middle and magnetic structures 2 located on both sides. The magnetic structure 1 includes magnetic ring 4-4 ​​located at both ends of the long, thin bag and two magnetic rings 4-5 symmetrically arranged at a certain distance from magnetic ring 4-4. The magnetic structure 2 includes magnetic rings 4-5 located at the two ends of the long, thin bag and two magnetic rings 4-5 symmetrically arranged at a certain distance from magnetic ring 4-4. The magnetic rings 4-4 and 4-3 on both sides of the short, thick bag, and the locking body 4-6 located in the middle of the magnetic rings 4-4 and 4-3, and the magnetic rings 4-4 at both ends of the long, thin bag are respectively integrated with the magnetic rings 4-4 on both sides of the short, thick bag. The magnetic rings and locking bodies 4-6 are connected by an elastic cloth bag 4-9. When energized, the magnetism of the magnetic ring 4-4 ​​is similar to that of the magnetic ring 4-3. The magnetic properties of magnetic ring 4-5 are opposite, causing magnetic ring 4-3 to move towards magnetic ring 4-4 ​​while magnetic ring 4-4 ​​moves towards magnetic ring 4-5. This causes the long, thin bag 4-1 and the short, thick bag 4-2 to become rounded and bulging, thus sealing the protective tube 5-1 and the drill hole 2. The locking body 4-6 is used to prevent magnetic ring 4-3, which is affected by the magnetic force, from moving further towards magnetic ring 4-4.

[0040] The internal magnetic ring structure is sleeved on the suction pipe 3, and the inner diameter of each magnetic ring and the locking body 4-6 is slightly larger than the outer diameter of the suction pipe 3. Magnetic ring 1 4-3 and magnetic ring 2 4-4 can slide on the suction pipe 3, and magnetic ring 3 4-5 and locking body 4-6 are fixed on the suction pipe 3. The grouting isolation device 5 is sleeved on the outside of the electromagnetic sealing bag 4, and the injection pipe 6 is wrapped on it, which plays a role in isolating and protecting the electromagnetic sealing bag 4. The electromagnetic sealing bag 4 is connected to the power supply line 7.

[0041] Furthermore, the magnetic ring body 4-3 and the magnetic ring body 4-4 are respectively provided with a circular ring fastening device for connecting and fastening the ports of the long thin bag and the short thick bag respectively.

[0042] Furthermore, the magnetic ring body 3 4-5 and the locking body 4-6 are provided with threads 10 on their inner sides, and threads 10 are also provided at the corresponding positions on the outer side of the extraction pipe 3. The magnetic ring body 3 and the locking body are fixed on the extraction pipe through thread matching.

[0043] Furthermore, the inner sides of the magnetic ring body 4-5 and the locking body 4-6 are divided into four symmetrical regions, one set of opposite regions being smooth and the other set being threaded. The corresponding positions on the outer side of the extraction tube are also threaded in the same way.

[0044] Furthermore, the short, thick bladder is equipped with a wireless smart valve 4-7, which can be remotely controlled to open and close via a wireless control device 4-8, thereby releasing the high-pressure energy from the short, thick bladder and facilitating the removal of the device.

[0045] Furthermore, the structure of the grouting isolation device matches the structure of the electromagnetic sealing bag, consisting of an isolation tube 5-1, an isolation bag one 5-2, an isolation bag two 5-3, a closing elastic band one 5-4, a closing elastic band two 5-5, a semi-circular clamp tube one 5-6, a semi-circular clamp tube two 5-7, and a long magnetic plate 5-8. The isolation tube 5-1 consists of two semi-circular tubes located in the middle area of ​​the grouting isolation device, with its two ends connected to the isolation bag one 5-2 and the isolation bag two 5-3, respectively. The outer ends of the isolation bags one 5-2 and the isolation bag two 5-3 are fitted with the closing elastic band one 5-4, and the inner ends... The sleeve has a second elastic band 5-5, and a first elastic band 5-4 can wrap the outer end of the protective bag around the air extraction pipe 3 to prevent the protective bag from flipping and falling off when the device touches the coal wall during drilling. The second elastic band 5-5 can wrap the inner end of the protective bag around the protective pipe 5-1. The two ends of the semi-circular clamp pipe 5-6 and the second semi-circular clamp pipe 5-7 are provided with opposite long magnetic plates 5-8, which attract each other to firmly clamp the inner end of the protective bag onto the protective pipe 5-1. The joint of the two semi-circular pipes is provided with a tight groove to ensure the tightness of the joint of the protective pipe 5-1.

[0046] Furthermore, the length of the protective tube 5-1 matches the length between the two magnetic rings 4-5, and is used to fit the part between the two magnetic rings on the long thin bag. The protective bag 5-2 and the protective bag 5-3 have the same structure, both consisting of the part fitted with the short thick bag and the part fitted with the long thin bag between the magnetic rings 4-4 and 4-5.

[0047] Furthermore, the protective bag 5-2 is provided with a hole for the injection tube 6 to pass through. After the injection tube 6 passes through the protective bag 5-2, it is fastened to the protective bag 5-2 by a spring clip.

[0048] Furthermore, the spring clip 9 is composed of a spring body 9-1, a clip tube wall 9-2, and a core 9-3. The core 9-3 is fixed at the bottom center of the clip tube wall 9-2. The spring body 9-1 is wrapped around the core, and its two wings extend to the top of the clip tube wall 9-2. The inner wall of the clip tube wall 9-2 is circular, with the same diameter as the outer wall of the injection tube. The upper arc surface of its outer wall is consistent with the arc surface of the inner wall of the drill hole, and the lower arc surface can achieve maximum contact area with the short, thick, drum-shaped bag, thereby ensuring good sealing of the short, thick bag to the drill hole. The spring body 9-1 is located inside the clip tube wall 9-2. After the spring clip 9 is opened, its two wings close around the core under the elastic force of the spring clip 9. All the edges and corners of the spring clip 9 are blunted to avoid damage to other devices.

[0049] Example 2

[0050] The second embodiment of the present invention provides a method for using an electromagnetic recyclable gas extraction borehole sealing device, comprising the following steps:

[0051] a. Pass the extraction pipe 3 through each magnetic ring and locking body 4-6 of the electromagnetic sealing bag 4. When the extraction pipe 3 passes through each magnetic ring and locking body, the smooth surface of the extraction pipe 3 faces the threaded surface of the magnetic ring and locking body. After passing through completely, when it is inserted into the appropriate position in the borehole 2, rotate the extraction pipe 3 so that the threaded surface of the extraction pipe matches the threaded surface of the magnetic ring 4-5 and locking body 4-6, thereby making the magnetic ring 4-5 and locking body 4-6 fit into the extraction pipe 3, and then the electromagnetic sealing bag 4 fits into the extraction pipe.

[0052] b. Pass the injection tube 6 through the diaphragm bag 5-2, then insert the spring clip 9 into the diaphragm bag 5-2, press the injection tube 6 tightly against the outer wall of the diaphragm bag, open the spring clip 9, and clamp the diaphragm bag and the injection tube together. This can fix the position of the injection tube on the diaphragm bag, making it convenient for the injection tube to be sent into the borehole together with other devices.

[0053] c. Wrap the grouting isolation device 5 with spring clip 9 and injection pipe 6 around the electromagnetic sealing bag. The specific operation is as follows: put the two semi-circular tubes together, wrap the part between the two magnetic rings 4-5 of the long thin bag in the middle to form the isolation tube 5-1, and pass the isolation bag 1 5-2 and isolation bag 2 5-3 with spring clip and injection pipe through the short thick bag 4-2 respectively. Wrap the closing elastic band 1 5-4 and closing elastic band 2 5-5 around the air extraction pipe 3 and the opening of the isolation tube 5-1 respectively. At the same time, use semi-circular clamp 1 5-6 and semi-circular clamp 2 5-7 to reinforce the inner ports of isolation bag 1 5-2 and isolation bag 2 5-3 on the isolation tube 5-1 so that the injection pipe opening is located in the grout sealing area.

[0054] d. Connect the power supply line 7 and the electromagnetic sealing bag 4, and send the air extraction pipe 3, which is fitted with the electromagnetic sealing bag 4 and the grouting isolation device 5, into the coal seam borehole 2;

[0055] e. After energization, magnetic ring 1 (4-3), magnetic ring 2 (4-4), and magnetic ring 3 (4-5) acquire opposite magnetism, causing magnetic ring 1 (4-3) to move towards magnetic ring 2 (4-4) and magnetic ring 2 (4-4) towards magnetic ring 3 (4-5). This forces the long, thin bag and the short, thick bag to become rounded and bulging. When magnetic ring 1 (4-3) approaches the locking body 4-6 and magnetic ring 2 (4-4) approaches magnetic ring 3 (4-5), the elastic band 1 (5-4) wrapped around the suction pipe breaks and falls off. The outer ends of the protective bags 1 (5-2) and 2 (5-3) open. At this time, the electromagnetic sealing bags reach their maximum rounded shape, pushing protective bags 1 and 2 against the borehole wall. The long, thin bag also pushes against the protective tube, completing the sealing of the borehole.

[0056] f. The sealing slurry 8 is delivered into the borehole sealing area through the injection pipe 6. The closed area formed by the electromagnetic sealing bag supporting the grouting isolation device to the inner wall of the borehole provides good conditions for pressurized grouting.

[0057] g. After the sealing grout 8 has solidified, gas extraction operations will be carried out;

[0058] h. When the gas concentration is below 4%, disconnect the line connection. The magnetic rings lose their magnetic attraction to each other. Under the tension of the electromagnetic sealing bag 4 itself, the magnetic rings move apart, causing the long thin bag and the short thick bag to return to their original shape.

[0059] i. Operate the wireless control device 4-8 to open the wireless smart valve 4-7, and the high-pressure energy in the short and thick bag is discharged, and the volume is reduced, making it easier for the short and thick bag to pass through the protective tube 5-1.

[0060] j. Remove the extraction pipe 3 containing the electromagnetic sealing bag to complete the recovery of the gas extraction device.

[0061] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Any equivalent structures or equivalent transformations made based on the content of the present invention specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of the present invention.

Claims

1. An electromagnetic recyclable gas extraction borehole sealing device, characterized in that, include: The system includes an electromagnetic sealing bag, a grouting isolation device, an extraction pipe, a material injection pipe, and a power supply line. The electromagnetic sealing bag consists of an outer bag and an internal magnetic ring structure. The outer bag includes a long, thin bag in the middle and short, thick bags on both sides. The internal magnetic ring structure is composed of magnetic ring one, magnetic ring two, magnetic ring three, a locking body, and an elastic cloth bag connected together. Its structure matches the structure of the outer bag. It includes a magnetic structure one in the middle and magnetic structures two on both sides. Magnetic structure one includes magnetic ring two at both ends of the long, thin bag and two magnetic ring threes symmetrically arranged at a certain distance from magnetic ring two. Magnetic structure two includes a magnetic ring two on the side of the short, thick bag near the long, thin bag, a magnetic ring one on the side of the short, thick bag away from the long, thin bag, and a magnetic ring three on the side of the short, thick bag and the magnetic ring three on the side of the long, thin bag. The magnetic ring body 1 is positioned between the locking body, and the magnetic ring body 2 at the end of the long, thin bag and the magnetic ring body 2 at the end of the short, thick bag are integrally set close to each other. The magnetic ring body 1 and the locking body, the magnetic ring body 2 and the locking body, the magnetic ring body 2 and the magnetic ring body 3, and the two magnetic ring bodies 3 are all connected by elastic cloth bags. When energized, the magnetic properties of the magnetic ring body 2 are opposite to those of the magnetic ring body 1 and the magnetic ring body 3. The internal magnetic ring structure is sleeved on the air extraction pipe, and the inner diameter of each magnetic ring body and the locking body is slightly larger than the outer diameter of the air extraction pipe. The magnetic ring body 1 and the magnetic ring body 2 can slide on the air extraction pipe, and the magnetic ring body 3 and the locking body are fixed on the air extraction pipe. The grouting isolation device is sleeved on the outside of the electromagnetic sealing bag and wraps the grouting pipe on it, which plays a role in isolating and protecting the electromagnetic sealing bag. The electromagnetic sealing bag is connected to the power supply line.

2. The electromagnetic recyclable gas extraction borehole sealing device according to claim 1, characterized in that, The first magnetic ring is provided with a circular ring fastening device for connecting and fastening the port of the short and thick sac, and the second magnetic ring is provided with a circular ring fastening device for connecting and fastening the ports of the long and thin sac and the short and thick sac.

3. The electromagnetic recyclable gas extraction borehole sealing device according to claim 1, characterized in that, The magnetic ring body and the locking body are provided with threads on the inner side, and the corresponding position on the outer side of the extraction tube is also provided with threads. The magnetic ring body and the locking body are fixed on the extraction tube by thread matching.

4. The electromagnetic recyclable gas extraction borehole sealing device according to claim 3, characterized in that, The inner side of the magnetic ring body and the card slot body is divided into four symmetrical areas, one set of opposite areas is smooth, and the other set of opposite areas is threaded. The corresponding position on the outside of the extraction tube is also set with threads in the same way.

5. The electromagnetic recyclable gas extraction borehole sealing device according to claim 1, characterized in that, The short, thick bladder is equipped with a wireless smart valve, which can be remotely controlled to open and close via a wireless control device, releasing the high-pressure energy from the bladder and facilitating the removal of the device.

6. The electromagnetic recyclable gas extraction borehole sealing device according to claim 1, characterized in that, The grouting isolation device structure matches the structure of the electromagnetic sealing bag, consisting of an isolation tube, an isolation bag I, an isolation bag II, a closing elastic band I, a closing elastic band II, a semi-circular clamp tube I, a semi-circular clamp tube II, and a long magnetic plate. The isolation tube consists of two semi-circular tubes located in the middle area of ​​the grouting isolation device, with its two ends connected to isolation bag I and isolation bag II respectively. The outer ends of isolation bag I and isolation bag II are fitted with closing elastic band I, and the inner ends are fitted with closing elastic band II. One elastic band can wrap the outer end of the protective bag around the air extraction pipe to prevent the protective bag from flipping and falling off when the device touches the coal wall during drilling. The other elastic band can wrap the inner end of the protective bag around the protective pipe. The two semi-circular clamps are equipped with oppositely shaped long magnetic plates at both ends, which attract each other to firmly clamp the inner end of the protective bag onto the protective pipe. The joint of the two semi-circular pipes is provided with a tight-fitting groove to ensure the tightness of the protective pipe joint.

7. The electromagnetic recyclable gas extraction borehole sealing device according to claim 6, characterized in that, The length of the protective tube matches the length between the two magnetic rings, and is used to fit the part between the two magnetic rings on the long, thin bag. The protective bag one and the protective bag two have the same structure, both consisting of the part fitted with the short, thick bag and the part fitted between the magnetic rings two and three on the long, thin bag.

8. The electromagnetic recyclable gas extraction borehole sealing device according to claim 6, characterized in that, The first protective bag is provided with a hole for the injection tube to pass through. After the injection tube passes through the first protective bag, it is fastened to the first protective bag by a spring clip.

9. The electromagnetic recyclable gas extraction borehole sealing device according to claim 7, characterized in that, The spring clip consists of a spring body, a clip tube wall, and a core. The core is fixed at the bottom center of the clip tube wall, and the spring body is wrapped around the core. Its two wings extend to the top of the clip tube wall. The inner wall of the clip tube wall is circular, with the same diameter as the outer wall of the injection tube. The upper arc surface of its outer wall is consistent with the arc surface of the inner wall of the drill hole, and the lower arc surface can achieve maximum contact area with the short, thick, drum-shaped bag, thereby ensuring good sealing of the short, thick bag to the drill hole. The spring body is located inside the clip tube wall. After the spring clip opens, its two wings close around the core under the elastic force of the spring clip. All the edges and corners of the spring clip are blunted to avoid damage to other devices.

10. A method of using an electromagnetic recyclable gas extraction borehole sealing device according to any one of claims 6-9, characterized in that, Includes the following steps: a. Pass the extraction tube through the electromagnetic plugging bag. When passing through the electromagnetic plugging bag, the smooth surface of the extraction tube should face the threaded surface of the magnetic ring body and the locking body. After passing through completely, when it is inserted into the appropriate position in the borehole, rotate the extraction tube so that the threaded surface of the extraction tube matches the threaded surface of the magnetic ring body and the locking body, thereby securing the magnetic ring body and the locking body to the extraction tube, and then securing the electromagnetic plugging bag to the extraction tube. b. Pass the injection tube through the first diaphragm bag, then insert the spring clip into the first diaphragm bag, press the injection tube tightly against the outer wall of the first diaphragm bag, open the spring clip, and clamp the first diaphragm bag and the injection tube together, thereby fixing the position of the injection tube on the first diaphragm bag, making it convenient for the injection tube to be sent into the borehole together with other devices. c. Wrap the grouting isolation device with spring clip and injection pipe around the electromagnetic sealing bag. The specific operation is as follows: put the two semi-circular tubes together, wrap the part between the two magnetic rings of the long thin bag in the middle to form the isolation tube, pass the isolation bag one with spring clip and injection pipe and the isolation bag two through the short thick bag respectively, and wrap the first set of closing rubber bands around the air extraction pipe, and wrap the second set of closing rubber bands around the opening of the isolation tube. At the same time, use the first and second semi-circular clamps to reinforce the inner ports of the first and second isolation bags to the isolation tube, so that the opening of the injection pipe is located in the grout sealing area. d. Connect the power supply line and the electromagnetic sealing bag, and send the air extraction pipe containing the electromagnetic sealing bag and the grouting isolation device into the borehole; e. After energization, magnetic ring 1, magnetic ring 2, and magnetic ring 3 acquire opposite magnetism, causing magnetic ring 1 to move towards magnetic ring 2 and magnetic ring 2 towards magnetic ring 3. This forces the long, thin bag and the short, thick bag to become rounded and bulging from their long, thin shape. When magnetic ring 1 approaches the locking body and magnetic ring 2 approaches magnetic ring 3, the elastic band 1 wrapped around the suction pipe breaks and falls off. The outer ends of the protective bags 1 and 2 open, and the electromagnetic sealing bags reach their maximum rounded shape. This pushes the protective bags 1 and 2 against the borehole wall, and the long, thin bag also pushes against the protective tube, completing the sealing of the borehole. f. The sealing grout is delivered into the borehole sealing area through the injection pipe. The closed area formed by the electromagnetic sealing bag supporting the grouting isolation device to the inner wall of the borehole provides good conditions for pressurized grouting. g. After the sealing grout has solidified, proceed with gas extraction. h. When the gas concentration is below 4%, disconnect the circuit connection. Magnetic ring one, magnetic ring two and magnetic ring three lose their mutual attraction and, under the tension of the electromagnetic sealing bag itself, drive the long thin bag and the short thick bag to return to their original shape. i. Operate the wireless control device to open the wireless smart valve, and the high-pressure energy in the short and thick bag will be discharged, and the volume will be reduced, making it easier for the short and thick bag to pass through the protective tube; j. Remove the extraction pipe fitted with the electromagnetic sealing bag to complete the recovery of the gas extraction device.

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