Mining pressure-resistant coal seam water injection hole packer and hole sealing method

Abstract

The invention relates to the technical field of hole sealing devices, and provides a mining pressure-resistant coal seam water injection hole sealing device and a hole sealing method.The mining pressure-resistant coal seam water injection hole sealing device comprises a water injection pipe, a sliding sleeve mechanism, a water injection taper pipe, a rotating separation mechanism and a coil pipe barrel; the sliding sleeve mechanism is sleeved with an expansion rubber sleeve, the water injection taper pipe is internally provided with a one-way valve assembly and enters a coal seam through a one-way valve, the rotating separation mechanism is used for detachably connecting the water injection pipe and the water injection taper pipe, the coil pipe barrel is arranged at the end, away from the water injection taper pipe, of the water injection pipe, and the expansion pipe mechanism is wound around the water injection pipe. The expansion pipe mechanism penetrates through the sliding sleeve mechanism to be communicated with the expansion rubber sleeve, the expansion pipe mechanism is used for being separated from the expansion rubber sleeve after the water injection pipe and the water injection taper pipe are separated, and through the technical scheme, the problem that in the prior art, when a drill hole needs to be plugged, the water injection hole packer and a pipeline are left in the drill hole, and the cost is high is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of hole sealers, and in particular to a mine-used pressure-resistant coal seam water injection hole sealer and a hole sealing method. Background Art

[0002] Coal seam water injection is a key technology in coal mine safety production. It mainly injects high-pressure water into the coal seam. After the water penetrates the coal seam, it can moisten the inside of the coal seam and reduce the generation of dust during mining. At the same time, the water injection makes the coal mine moist and expand, promotes the desorption of gas and brings the gas out through the water flow. The high-pressure water will also fracture the coal seam, reduce the hardness of the coal body, and facilitate mining. After drilling a hole in the coal seam and inserting the water injection sealer into the borehole, the expansion cavity is expanded and thickened by injecting water into the expansion cavity, blocking the borehole. Then the high-pressure water is transported to the coal seam through the water pipe on the sealer.

[0003] Depending on the needs, when long-term water injection is required or the geological conditions are complex, the hole sealer is not convenient to remove and it is necessary to leave the hole sealer in the borehole for sealing to prevent water from spraying out of the coal seam. The traditional method is to disconnect the water pipe and leave the hole sealer and the water pipe as a whole in the borehole. However, the depth of water injection is generally between one and fifty meters. At a deeper depth, the length of the pipeline lost is longer, and the cost of leaving the water injection hole sealer as a whole in the borehole is also higher. Summary of the Invention

[0004] The present invention provides a mine-used pressure-resistant coal seam water injection hole sealer and a hole sealing method, which are used to solve the problem in the prior art of high cost of leaving the water injection hole sealer and pipeline in the borehole when the borehole needs to be sealed.

[0005] The technical solutions of the present invention are as follows:

[0006] A pressure-resistant coal seam water injection sealer for mining, comprising a water injection pipe, a sliding sleeve mechanism, a water injection cone, a rotating separation mechanism and a coil barrel, wherein the sliding sleeve mechanism is slidingly sleeved on the water injection pipe, an expansion rubber sleeve is sleeved on the sliding sleeve mechanism, and the expansion rubber sleeve expands with water injection to seal the borehole, the water injection cone is fixedly connected to the sliding sleeve mechanism, the water injection cone is configured to be conical, a one-way valve assembly is provided in the water injection cone, water can enter the water injection cone through the water injection pipe and enter the coal seam through the one-way valve, and the rotating separation mechanism is configured to be It is arranged between the water injection cone and the water injection pipe, and the rotating separation mechanism is used to detachably connect the water injection pipe and the water injection cone, the coil barrel is fixedly connected to the water injection pipe, and the coil barrel is arranged on one end of the water injection pipe away from the water injection cone, and an expansion tube mechanism is provided in the coil barrel, and the expansion tube mechanism is wound around the water injection pipe, and the expansion tube mechanism passes through the sliding sleeve mechanism and is connected with the expansion rubber sleeve, and the expansion tube mechanism is used to separate from the expansion rubber sleeve after the water injection pipe and the water injection cone are separated.

[0007] The sliding sleeve mechanism includes sleeve 1 and sleeve 2, sleeve 1 is fixedly connected to the water injection cone, the water injection pipe passes through sleeve 1, sleeve 2 is slidingly sleeved on the water injection pipe, and the two ends of the expansion rubber sleeve are fixedly connected to sleeve 1 and sleeve 2 respectively.

[0008] When the expansion rubber sleeve expands, the expansion rubber sleeve pulls the second sleeve to slide toward the first sleeve. A cover tube is provided on one end of the first sleeve close to the second sleeve. When the second sleeve slides toward the first sleeve, it can extend into the cover tube.

[0009] The expansion tube mechanism includes a connecting tube, a quick-release joint and an expansion tube. The connecting tube passes through the second sleeve and is connected to the expansion rubber sleeve. The quick-release joint is fixedly installed on the connecting tube. The expansion tube is fixedly connected to the quick-release joint. The expansion tube is wrapped around the water injection tube. Both the expansion tube and the water injection tube pass through the coil barrel.

[0010] The connection between the expansion tube and the quick-release joint is bent into a zigzag shape, a break line is fixedly connected between the zigzag part of the expansion tube and the second sleeve, a traction rope is fixedly connected to the quick-release handle on the quick-release joint and the zigzag shape on the expansion tube, and the length of the traction rope is greater than the break line.

[0011] The rotation separation mechanism includes a docking sleeve, a rotating tube, a rotating slot and a docking block. The docking sleeve is fixedly installed on the water injection cone tube. The docking sleeve is fixedly connected to the sleeve. The rotating tube is rotatably set on the water injection pipe. The rotating tube passes through the docking sleeve. There are multiple rotating slots. Multiple rotating slots are circumferentially opened inside the docking sleeve. The docking blocks correspond to the rotating slots one by one. Multiple docking blocks are fixedly connected to the rotating tube. The docking blocks are slidably set in the rotating slots.

[0012] The rotating slot is set to an M shape, the docking block can be separated from the rotating slot, a plurality of arc grooves are provided on the side of the docking sleeve close to the water injection pipe, a plurality of spring sheets are fixedly connected to the rotating tube, the spring sheets pull the docking sleeve and the rotating tube closer to each other, the spring sheets are detachably connected to the arc groove, and when the rotating tube and the docking sleeve are relatively rotated and separated, the spring is separated from the arc groove.

[0013] A positioning hole is provided on the water injection cone tube, and a positioning pin is detachably provided on the positioning hole. The positioning pin is detachably connected to the rotating tube.

[0014] A method for sealing a hole with water injection in a pressure-resistant coal seam for mining, using the above-mentioned pressure-resistant coal seam water injection sealing device for mining, comprises the following steps:

[0015] Step 1: Inserting the hole sealer: inserting the hole sealer into the drilled hole, and connecting the expansion pipe and the water injection pipe to the external high-pressure water pipe;

[0016] Step 2: Expansion sealing: water in the expansion tube is fed into the expansion rubber sleeve, the expansion rubber sleeve expands and contacts the borehole wall, the expansion tube pulls the second sleeve to slide toward the first sleeve, and the second sleeve slides into the cover tube;

[0017] Step 3, high-pressure water injection: The water in the water injection pipe passes through the rotating pipe, the docking sleeve and the water injection cone in sequence, and the water squeezes the one-way valve assembly open, and the water enters the coal seam. After the water pressure passes through the one-way valve assembly, it encounters resistance, causing the water injection pipe and the water injection cone to move away from each other;

[0018] Step 4: Rotational separation: After water injection is completed, the water pressure in the water injection pipe is reduced, the spring sheet pulls the docking sleeve and the rotating tube closer to each other, and then high-pressure water injection is performed. The water pressure pushes the docking sleeve and the rotating tube away from each other, and the rotating tube rotates on the docking sleeve;

[0019] Step 5: Docking and separation: As the tube rotates, the spring sheet separates from the arc-shaped groove, and the docking sleeve and the rotating tube separate;

[0020] Step 6: stretching the expansion tube: after the docking block is separated from the rotating tube, the water injection tube slides in a direction away from the water injection cone, and the water injection tube pulls the expansion tube to move;

[0021] Step 7: Separating the expansion tube: the expansion tube pulls the breaking wire, the breaking wire breaks, the zigzag portion on the expansion tube stretches out, the expansion tube pulls the traction rope, and the quick-release connector separates.

[0022] The working principle and beneficial effects of the present invention are:

[0023] 1. In the present invention, by providing a quick-release joint and an expansion tube, the wound expansion tube satisfies the requirement of constantly injecting water into the expansion sleeve when the expansion sleeve expands and pulls the sleeve 2. At the same time, the traction rope is protected by breaking the line, and the expansion tube is separated by pulling the traction rope, which is very simple to separate.

[0024] 2. In the present invention, by providing a docking sleeve and a rotating pipe, the docking sleeve and the rotating pipe will not affect the water flow during normal use. At the same time, no additional control circuit or other devices are required, which is suitable for the environment in the coal seam. The separation is controlled by the change of water pressure in the water injection pipe during water injection, which simplifies the equipment and reduces the risk of failure. At the same time, the length and number of vertical rails are used to provide a redundant design to avoid erroneous disconnection during use.

[0025] 3. In the present invention, by setting up an expansion tube mechanism, the expansion tube can be conveniently separated and adapted to the sliding conditions of the sliding sleeve mechanism. By setting up a rotating separation mechanism, separation can be performed by controlling the water pressure, making the separation operation simpler. At the same time, the water pipe and the water injection pipe can be used multiple times, which saves a lot of money. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0028] Figure 2 Schematic diagram of the internal structure of the coil barrel in the present invention;

[0029] Figure 3 Schematic diagram of the cross-sectional internal structure of the sliding sleeve mechanism of the present invention;

[0030] Figure 4 Schematic diagram of the internal structure of the water injection cone in the present invention;

[0031] Figure 5 This is a schematic structural diagram of the docking sleeve and the rotating tube in the present invention;

[0032] Figure 6 It is a schematic diagram of the separated cross-sectional structure of the docking sleeve and the rotating tube in the present invention;

[0033] Figure 7 It is a schematic cross-sectional structural diagram of the cooperation between the rotating slot and the docking block in the present invention.

[0034] In the figure: 1. Water injection pipe; 2. Expansion rubber sleeve; 3. Water injection cone; 4. One-way valve assembly; 5. Coil barrel; 6. Sleeve 1; 7. Sleeve 2; 8. Cover tube; 9. Connecting pipe; 10. Quick-release connector; 11. Expansion pipe; 12. Break wire; 13. Towing rope; 14. Docking sleeve; 15. Rotating pipe; 16. Rotating slot; 17. Docking block; 18. Arc groove; 19. Spring sheet; 20. Positioning hole; 21. Positioning pin. DETAILED DESCRIPTION

[0035] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0036] Example 1

[0037] like Figures 1 to 7 As shown, this embodiment proposes a mine-used pressure-resistant coal seam water injection sealer, including a water injection pipe 1, a sliding sleeve mechanism, a water injection cone 3, a rotating separation mechanism and a coil barrel 5. The sliding sleeve mechanism is slidingly sleeved on the water injection pipe 1, and an expansion rubber sleeve 2 is sleeved on the sliding sleeve mechanism. The expansion rubber sleeve 2 is expanded by water injection to seal the borehole. The water injection cone 3 is fixedly connected to the sliding sleeve mechanism. The water injection cone 3 is set to be conical. A one-way valve assembly 4 is provided in the water injection cone 3. Water can enter the water injection cone 3 through the water injection pipe 1 and enter the coal seam through the one-way valve. The rotating separation mechanism is set between the water injection cone 3 and the water injection pipe 1. The rotating separation mechanism is used In order to make a detachable connection between the water injection pipe 1 and the water injection cone 3, the coil barrel 5 is fixedly connected to the water injection pipe 1, and the coil barrel 5 is arranged on the end of the water injection pipe 1 away from the water injection cone 3. An expansion tube 11 mechanism is provided in the coil barrel 5, and the expansion tube 11 mechanism is wound around the water injection pipe 1. The expansion tube 11 mechanism passes through the sliding sleeve mechanism and is connected with the expansion rubber sleeve 2. The expansion tube 11 mechanism is used to separate from the expansion rubber sleeve 2 after the water injection pipe 1 and the water injection cone 3 are separated. The coil barrel 5 is connected to the expansion rubber sleeve 2. When the sealer is sent into the borehole, the coil barrel 5 can protect the expansion tube 11 wrapped around the water injection pipe 1 to avoid the influence of coal mine fragments on it.

[0038] like Figures 1 to 3As shown, the sliding sleeve mechanism includes sleeve 1 6 and sleeve 2 7. Sleeve 1 6 is fixedly connected to the water injection cone 3. The water injection pipe 1 passes through sleeve 1 6. Sleeve 2 7 is slidingly sleeved on the water injection pipe 1. The two ends of the expansion rubber sleeve 2 are respectively fixedly connected to sleeve 1 6 and sleeve 2 7. When the expansion rubber sleeve 2 expands, the expansion rubber sleeve 2 pulls sleeve 2 7 to slide toward sleeve 1 6. A cover tube 8 is provided on the end of sleeve 1 6 close to sleeve 2 7. When sleeve 2 7 slides toward sleeve 1 6, it can extend into the cover tube 8. Sleeve 1 6 and sleeve 2 7 can support the expansion rubber sleeve 2 inside the expansion rubber sleeve 2. By providing the cover tube 8, it can avoid extrusion damage to the expansion rubber sleeve 2 when sleeve 1 6 and sleeve 2 7 are close to each other. At the same time, after the water injection pipe 1 is separated, sleeve 1 6 and sleeve 2 7 support the expansion rubber sleeve 2.

[0039] like Figures 1 to 3 As shown, the expansion tube 11 mechanism includes a connecting tube 9, a quick-release joint 10 and an expansion tube 11. The connecting tube 9 passes through the sleeve 2 7 and is connected to the expansion rubber sleeve 2. The quick-release joint 10 is fixedly installed on the connecting tube 9. The expansion tube 11 is fixedly connected to the quick-release joint 10. The expansion tube 11 is wrapped around the water injection pipe 1. The expansion tube 11 and the water injection pipe 1 both pass through the coil barrel 5. The connection between the expansion tube 11 and the quick-release joint 10 is bent into a zigzag shape. A break wire 12 is fixedly connected between the zigzag part on the expansion tube 11 and the sleeve 2 7. A traction rope 13 is fixedly connected to the quick-release handle on the quick-release joint 10 and the zigzag on the expansion tube 11. The length of the traction rope 13 is greater than the break wire 1 2. The expansion tube 11 is set in a zigzag shape so that the traction rope 13 and the breaking wire 12 can be effectively stretched when the expansion tube 11 is stretched and straightened. The breaking wire 12 will break when subjected to a large tensile force. Then the expansion tube 11 stretches the traction rope 13, and the traction rope 13 disconnects the quick-release joint 10 by pulling the quick-release handle. The breaking wire 12 is shorter than the traction rope 13 and serves as a protection line for the traction rope 13 to prevent the expansion tube 11 from naturally bending and pulling the quick-release handle. A one-way valve is provided between the quick-release joint 10 and the expansion sleeve 2. When the expansion tube 11 is separated from the expansion sleeve 2, the pressure inside the expansion sleeve 2 is maintained by the one-way valve.

[0040] like Figures 4 to 6As shown, the rotation separation mechanism includes a docking sleeve 14, a rotating tube 15, a rotating slot 16 and a docking block 17. The docking sleeve 14 is fixedly installed on the water injection cone 3, the docking sleeve 14 is fixedly connected to the sleeve 16, the rotating tube 15 is rotatably set on the water injection pipe 1, the rotating tube 15 passes through the docking sleeve 14, and a plurality of rotating slots 16 are provided. A plurality of rotating slots 16 are circumferentially opened inside the docking sleeve 14, and an opening is provided on one side of the docking sleeve 14 close to the rotating tube 15. The opening is connected to the rotating slot 16, and the opening is connected to the rotating slot 16 on one side of the rotation direction of the docking block 17. The docking block 17 corresponds to the rotating slot 16 one by one, and a plurality of docking blocks 17 are fixedly connected to the rotating tube 15. The docking block 17 is slidably set in the rotating slot 1 6, after high-pressure water is sent into through the water injection pipe 1 and contacts the one-way valve assembly 4, the pressure between the one-way valve assembly 4 and the water injection pipe 1 increases, pushing the docking sleeve 14 and the rotating tube 15 away from each other, stretching the spring sheet 19. After the coal seam water injection is completed, the water pressure can be increased, the water pressure can be reduced, and the water pressure can be increased repeatedly to make the docking block 17 slide back and forth in the rotating slot 16 until the docking block 17 moves to the opening on the rotating slot 16. At this time, the docking sleeve 14 and the rotating tube 15 can be separated by high-pressure water injection, and the spring sheet 19 is also separated from the arc groove 18. The water pressure and the external pull on the water pipe can separate the water injection pipe 1 from the water injection cone 3. At the same time, the one-way valve assembly 4 can prevent the water in the coal seam from being discharged through the water injection cone 3.

[0041] like Figures 4 to 7 As shown, the rotating slot 16 is set to an M shape, the docking block 17 can be separated from the rotating slot 16, and a plurality of arc grooves 18 are provided on the side of the docking sleeve 14 close to the water injection pipe 1. A plurality of spring pieces 19 are fixedly connected to the rotating tube 15. The spring pieces 19 pull the docking sleeve 14 and the rotating tube 15 close to each other. The spring pieces 19 are detachably connected to the arc groove 18. When the rotating tube 15 and the docking sleeve 14 are relatively rotated and separated, the spring is separated from the arc groove 18. In this embodiment, the rotating slot 16 is composed of three vertical tracks. The vertical tracks are connected near one end of the water injection pipe 1, and an oblique block is provided at the connection point to allow the docking block 17 to be offset when it contacts it. The side close to the water injection pipe 1 is set to be inclined. When the spring sheet 19 is shortened and the docking block 17 slides to the vertical track connection, it will slide toward the adjacent vertical track under the action of the inclined block. Then when the spring is stretched, the docking block 17 slides toward the water injection cone 3 and will slide to the inside of the adjacent vertical track. The length of the vertical track is set longer. When used under normal water pressure, the water pressure pushes the docking sleeve 14 and the rotating tube 15 away, and the docking block 17 will not slide to the connection point of the vertical track. When the over-expanded rubber sleeve 2 needs to be separated, the docking sleeve 14 and the rotating tube 15 can be separated by introducing a water pressure higher than that during normal use and then reducing the water pressure through alternating reactions.

[0042] like Figure 4 As shown, a positioning hole 20 is provided on the water injection cone 3, and a positioning pin 21 is detachably provided on the positioning hole 20. The positioning pin 21 is detachably connected to the rotating tube 15. After the positioning pin 21 is inserted into the positioning hole 20, the rotating tube 15 is fixed. The rotating tube 15 cannot rotate relative to the docking sleeve 14, so that the rotating tube 15 and the docking sleeve 14 cannot be separated. The positioning pin 21 can be inserted without leaving the hole sealer in the drilled hole.

[0043] In this embodiment, when the expansion rubber sleeve 2 needs to be separated, the water pressure in the water injection pipe 1 is increased, the docking sleeve 14 and the rotating pipe 15 move away from each other, the docking block 17 slides to the adjacent position of the vertical track, and deviates under the action of the inclined block. At this time, the rotating pipe 15 rotates, and then the water pressure is reduced. The one-way valve assembly 4 is used to prevent the water pressure in the coal seam from affecting the pressure in the water injection pipe 1. The spring sheet 19 pulls the docking sleeve 14 and the rotating pipe 15 closer to each other, and the docking block 17 slides to the vertical track. , and so on, until the docking block 17 slides to the vertical track with an opening, and the docking block 17 slides to the outside of the rotating slot 16 through the opening. As the rotating tube 15 rotates, the spring piece 19 rotates and separates from the arc groove 18. At this time, the water injection pipe 1 is separated from the water injection cone 3 under the action of water pressure and tension, and the expansion tube 11 is pulled. After the breaking line 12 is broken, the traction rope 13 is pulled to disconnect the quick-release joint 10. At this time, the expansion rubber sleeve 2 remains in the borehole, and the one-way valve assembly 4 blocks the water in the coal seam.

[0044] Example 2

[0045] A method for sealing a hole with water injection in a pressure-resistant coal seam for mining, using the above-mentioned pressure-resistant coal seam water injection sealing device for mining, comprises the following steps:

[0046] Step 1: Insert the hole sealer: insert the hole sealer into the drilled hole, and connect the expansion pipe 11 and the water injection pipe 1 to the external high-pressure water pipe;

[0047] Step 2: Expansion sealing: The water in the expansion tube 11 is fed into the expansion rubber sleeve 2. The expansion rubber sleeve 2 expands and contacts the borehole wall. The expansion tube 11 pulls the sleeve 2 7 to slide toward the sleeve 1 6. The sleeve 2 7 slides into the cover tube 8.

[0048] Step 3: High-pressure water injection: The water in the water injection pipe 1 passes through the rotating pipe 15, the docking sleeve 14, and the water injection cone 3 in sequence. The water squeezes the one-way valve assembly 4 open and the water enters the coal seam. After the water pressure passes through the one-way valve assembly 4, it encounters resistance, causing the water injection pipe 1 and the water injection cone 3 to move away from each other.

[0049] Step 4: Rotational separation: After water injection is completed, the water pressure in the water injection pipe 1 is reduced, and the spring sheet 19 pulls the docking sleeve 14 and the rotating tube 15 closer to each other. Then, high-pressure water injection is performed, and the water pressure pushes the docking sleeve 14 and the rotating tube 15 away from each other, and the rotating tube 15 rotates on the docking sleeve 14;

[0050] Step 5: Docking and separation: As the tube 15 rotates, the spring piece 19 separates from the arc groove 18, and the docking sleeve 14 and the rotating tube 15 separate;

[0051] Step 6: Stretch the expansion tube 11: After the docking block 17 is separated from the rotating tube 15, the water injection tube 1 slides in a direction away from the water injection cone 3, and the water injection tube 1 pulls the expansion tube 11 to move;

[0052] Step 7: Separation of the expansion tube 11: The expansion tube 11 pulls the breaking wire 12, the breaking wire 12 is disconnected, the zigzag portion of the expansion tube 11 stretches out, the expansion tube 11 pulls the traction rope 13, and the quick-release connector 10 is separated.

[0053] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A mine-used pressure-resistant coal seam water injection sealer, comprising a water injection pipe (1), characterized in that: Also includes: A sliding sleeve mechanism, the sliding sleeve being arranged on the water injection pipe (1), an expansion rubber sleeve (2) being arranged on the sliding sleeve mechanism, and the expansion rubber sleeve (2) being expanded by water injection to seal the borehole; A water injection cone (3) is fixedly connected to the sliding sleeve mechanism, the water injection cone (3) is configured to be conical, and a one-way valve assembly (4) is provided in the water injection cone (3), so that water can enter the water injection cone (3) through the water injection pipe (1) and enter the coal seam through the one-way valve; a rotating separation mechanism, arranged between the water injection cone (3) and the water injection pipe (1), the rotating separation mechanism being used to detachably connect the water injection pipe (1) and the water injection cone (3); A coil barrel (5) is fixedly connected to the water injection pipe (1). The coil barrel (5) is arranged on one end of the water injection pipe (1) away from the water injection cone (3). An expansion pipe (11) mechanism is arranged in the coil barrel (5). The expansion pipe (11) mechanism is wound around the water injection pipe (1). The expansion pipe (11) mechanism passes through the sliding sleeve mechanism and is connected to the expansion rubber sleeve (2). The expansion pipe (11) mechanism is used to separate from the expansion rubber sleeve (2) after the water injection pipe (1) and the water injection cone (3) are separated.

2. A mine-used pressure-resistant coal seam water injection sealer according to claim 1, characterized in that: The sliding sleeve mechanism comprises: Sleeve 1 (6) is fixedly connected to the water injection cone (3), and the water injection pipe (1) passes through the sleeve 1 (6); The second sleeve (7) is slidably mounted on the water injection pipe (1), and the two ends of the expansion rubber sleeve (2) are fixedly connected to the first sleeve (6) and the second sleeve (7) respectively.

3. A mine-used pressure-resistant coal seam water injection sealer according to claim 2, characterized in that: When the expansion rubber sleeve (2) expands, the expansion rubber sleeve (2) pulls the second sleeve (7) to slide toward the first sleeve (6), and a cover tube (8) is provided on one end of the first sleeve (6) close to the second sleeve (7). When the second sleeve (7) slides toward the first sleeve (6), it can extend into the cover tube (8).

4. A mine-used pressure-resistant coal seam water injection sealer according to claim 3, characterized in that: The expansion tube (11) mechanism comprises: A connecting pipe (9) passes through the second sleeve (7) and is connected to the expansion rubber sleeve (2); A quick-release connector (10) is fixedly mounted on the connecting pipe (9); An expansion tube (11) is fixedly connected to the quick-release joint (10), the expansion tube (11) is wound around the water injection tube (1), and both the expansion tube (11) and the water injection tube (1) pass through the coil barrel (5).

5. A mine-used pressure-resistant coal seam water injection sealer according to claim 4, characterized in that: The connection between the expansion tube (11) and the quick-release joint (10) is bent into a zigzag shape, a breaking wire (12) is fixedly connected between the zigzag portion on the expansion tube (11) and the second sleeve (7), a traction rope (13) is fixedly connected between the quick-release handle on the quick-release joint (10) and the zigzag portion on the expansion tube (11), and the length of the traction rope (13) is greater than the breaking wire (12).

6. A mine-used pressure-resistant coal seam water injection sealer according to claim 5, characterized in that: The rotation separation mechanism comprises: A docking sleeve (14) is fixedly mounted on the water injection cone (3), and the docking sleeve (14) is fixedly connected to the sleeve 1 (6); A rotating pipe (15) is rotatably arranged on the water injection pipe (1), and the rotating pipe (15) passes through the docking sleeve (14); A plurality of rotating slots (16) are provided, wherein the plurality of rotating slots (16) are circumferentially opened inside the docking sleeve (14), and an opening is provided on a side of the docking sleeve (14) close to the rotating tube (15), and the opening is communicated with the rotating slots (16); The docking blocks (17) correspond to the rotating slots (16) one by one. A plurality of the docking blocks (17) are fixedly connected to the rotating tube (15). The docking blocks (17) are slidably arranged in the rotating slots (16).

7. A mine-used pressure-resistant coal seam water injection sealer according to claim 6, characterized in that: The rotating slot (16) is set to be M-shaped, the docking block (17) can be separated from the rotating slot (16), a plurality of arc grooves (18) are set on the side of the docking sleeve (14) close to the water injection pipe (1), and a plurality of spring pieces (19) are fixedly connected to the rotating tube (15). The spring pieces (19) pull the docking sleeve (14) and the rotating tube (15) closer to each other. The spring pieces (19) are detachably connected to the arc grooves (18). When the rotating tube (15) and the docking sleeve (14) are relatively rotated and separated, the springs are separated from the arc grooves (18).

8. A mine-used pressure-resistant coal seam water injection sealer according to claim 7, characterized in that: A positioning hole (20) is provided on the water injection cone (3), a positioning pin (21) is detachably provided on the positioning hole (20), and the positioning pin (21) is detachably connected to the rotating tube (15).

9. A method for sealing a pressure-resistant coal seam with water injection, using the pressure-resistant coal seam water injection sealing device according to claim 8, characterized in that: The following steps are involved: S1. Inserting the hole sealer: inserting the hole sealer into the drilled hole, and connecting the expansion pipe (11) and the water injection pipe (1) to an external high-pressure water pipe; S2, expansion and sealing: water in the expansion tube (11) is fed into the expansion rubber sleeve (2), the expansion rubber sleeve (2) expands and contacts the borehole wall, the expansion tube (11) pulls the second sleeve (7) to slide toward the first sleeve (6), and the second sleeve (7) slides into the cover tube (8); S3, high-pressure water injection: the water in the water injection pipe (1) passes through the rotating pipe (15), the docking sleeve (14) and the water injection cone (3) in sequence, the water squeezes the one-way valve assembly (4) to open, and the water enters the coal seam. After the water pressure passes through the one-way valve assembly (4), it encounters resistance, causing the water injection pipe (1) and the water injection cone (3) to move away from each other; S4, rotation separation: after the water injection is completed, the water pressure in the water injection pipe (1) is reduced, the spring sheet (19) pulls the docking sleeve (14) and the rotating tube (15) closer to each other, and then high-pressure water injection is performed, the water pressure pushes the docking sleeve (14) and the rotating tube (15) away from each other, and the rotating tube (15) rotates on the docking sleeve (14); S5, docking and separation: as the tube (15) rotates, the spring sheet (19) separates from the arc groove (18), and the docking sleeve (14) and the rotating tube (15) separate; S6, the expansion tube (11) is stretched: after the docking block (17) is separated from the rotating tube (15), the water injection tube (1) slides in a direction away from the water injection cone (3), and the water injection tube (1) pulls the expansion tube (11) to move; S7, the expansion tube (11) is separated: the expansion tube (11) pulls the breaking wire (12), the breaking wire (12) is broken, the zigzag portion on the expansion tube (11) stretches out, the expansion tube (11) pulls the traction rope (13), and the quick-release connector (10) is separated.

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