Air leakage stoppage device for drainage hole in coal mine goaf

Abstract

The invention relates to the technical field of coal mine production, in particular to a coal mine goaf drainage hole air leakage stopping device which comprises a fixing disc fixedly installed at an opening of a drainage hole. The sealing disc is installed below the fixed disc, a connecting cylinder is fixedly installed above the sealing disc, the upper portion of the connecting cylinder is connected with the bottom of the fixed disc, a sealed space is formed between the fixed disc and the sealing disc, and a first water drainage hole and a second water drainage hole are formed in the fixed disc and the sealing disc respectively; the sealing assembly is used for sealing the first water drainage hole and the second water drainage hole and comprises a first sealing disc and a second sealing disc which are vertically distributed in a spaced mode, a connecting shaft is coaxially arranged between the first sealing disc and the second sealing disc, the connecting shaft is installed in the connecting cylinder in a vertical sliding mode, and the top of the connecting shaft extends out of the first sealing disc; and a lifting assembly is fixedly mounted above the fixed disc. The states of the first water drainage hole and the second water drainage hole can be adjusted according to actual requirements, and the requirements of the water drainage hole in different working states are met.

Description

Technical Field

[0001] The invention relates to the technical field of coal mine production, and in particular to a device for plugging air leakage through a drainage hole in a coal mine goaf area. Background Art

[0002] During the coal mining process, the overlying rocks lose their support due to the mining of coal seams, and finally goafs are formed. There are rich hydrogeological conditions inside the goafs, and coal mining will destroy these conditions, resulting in increased water pressure inside the goafs. In order to prevent the water pressure inside the goafs from continuing to rise, to allow the groundwater in the goafs to be reasonably discharged, and to reduce the occurrence of geological disasters, drainage holes need to be excavated during coal mining; in order to prevent the drainage holes from becoming air leakage channels after drainage, affecting the ventilation system and safe production of the mines, coal mines usually use air leakage plugging devices to close the drainage holes.

[0003] However, the conventional drainage hole plugging device only plugs the drainage hole. When drainage is needed again, the installed drainage hole plugging device needs to be disassembled, and it cannot be opened conveniently and timely, and the working state of the drainage hole plugging device cannot be flexibly adjusted according to the actual use environment of the coal mine. Summary of the invention

[0004] Technical issues solved

[0005] In view of the above-mentioned shortcomings of the prior art, the present invention provides a device for plugging air leakage through drainage holes in coal mine goaf areas, which can effectively solve the problem that the device for plugging air leakage through drainage holes in the prior art only plugs the drainage holes, and when drainage is needed again, the installed device for plugging air leakage through drainage holes needs to be disassembled and cannot be opened conveniently and promptly.

[0006] Technical Solution

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0008] The present invention provides a device for plugging air leakage in a drainage hole in a coal mine goaf, comprising a fixed plate fixedly installed at the opening of the drainage hole;

[0009] The sealing disk is installed below the fixed disk, and a connecting tube is fixedly installed above the fixed disk. The upper part of the connecting tube is connected to the bottom of the fixed disk, and a sealed space is formed between the fixed disk and the sealing disk. The fixed disk and the sealing disk are respectively provided with a first water outlet hole and a second water outlet hole;

[0010] A sealing assembly is used to seal the first water hole and the second water hole, and includes a first sealing plate and a second sealing plate that are spaced apart from each other. A connecting shaft is coaxially arranged between the first sealing plate and the second sealing plate. The connecting shaft is slidably installed up and down inside the connecting tube. The top of the connecting shaft extends out of the first sealing plate. A lifting assembly for driving the connecting shaft to move up and down is fixedly installed above the fixed plate.

[0011] Furthermore, a protruding plate is fixedly mounted on the outer side of the fixed plate, and a cylindrical structure inserted into the drain hole is formed below the fixed plate.

[0012] Furthermore, a mounting frame is arranged on the outer side of the sealing disk, an annular groove is formed on the outer peripheral surface of the mounting frame, and a sealing airbag is arranged inside the annular groove.

[0013] Furthermore, a sliding piston is fixedly installed on the outer side of the connecting shaft, and the outer peripheral surface of the sliding piston is sealed and slidably connected to the inner wall of the connecting cylinder. An extrusion space is formed between the connecting shaft and the connecting cylinder, and a connecting pipe is provided at the bottom of the pressurized space. The connecting pipe is used to fill gas into the sealed airbag.

[0014] Among them, the sliding piston and the connecting pipe are both provided with a one-way valve that only allows the air inside the extrusion space to flow into the sealed airbag, and the sealed airbag is also provided with an electromagnetic control valve for exhausting gas; in the process of using the equipment to seal the drain hole, by driving the connecting shaft to move up and down, the sliding piston can compress the air inside the extrusion space, and the high-pressure air can enter the sealed airbag, so that the sealed airbag is fully inflated, and has a better sealing effect.

[0015] Furthermore, the connecting cylinder is provided with guide openings on all sides, the connecting shaft is fixedly provided with connecting arms extending out of the guide openings on all sides, and the first sealing disk is connected to the connecting shaft via the connecting arms.

[0016] Furthermore, a plurality of raised blocks are fixedly installed above the first sealing plate and the second sealing plate, and the shapes of the raised blocks correspond to the shapes of the first drain hole and the second drain hole respectively. When the first sealing plate and the second sealing plate block the first drain hole and the second drain hole, the raised blocks above the first sealing plate and the second sealing plate pass through the first drain hole and the second drain hole respectively.

[0017] Furthermore, a limiting groove is arranged on the side of the raised block of the first sealing disk, a limiting plate for being clamped on the limiting groove is arranged on the fixed disk, and a sliding rod for driving the limiting plate to be clamped in the limiting groove is arranged on the side of the limiting plate.

[0018] Furthermore, a plurality of guide grooves are radially arranged on the fixed disk, and the guide grooves are used to guide the sliding rods to slide radially on the fixed disk. Each group of the limit plates has two limit plates, and the backs of the two limit plates are installed opposite to each other. An elastic member for driving the two limit plates to approach each other is arranged between the two limit plates, and the middle part of the elastic member is fixedly installed inside the guide groove. In the process of each sliding rod moving away from the center of the fixed disk, the two limit plates of each group of limit plates are driven away from each other, and the limit plates are driven to be stuck in the limit grooves.

[0019] Furthermore, a first wedge block is provided on the upper end surface of the limit plate, and second wedge blocks are provided on both sides of the sliding rod. The inclined surfaces of the first wedge block and the second wedge block are parallel to each other, and a pushing component is provided on the side of the connecting shaft for driving the sliding rod to move away from the center of the fixed disk.

[0020] Furthermore, a plurality of mounting grooves are provided on the side of the connecting shaft, the pushing assembly is installed inside the mounting groove, the pushing assembly includes a pushing block and an elastic component, the elastic component is fixedly installed inside the mounting groove, and one end of the elastic component is fixedly connected to the pushing block.

[0021] Beneficial Effects

[0022] Compared with the known public technology, the technical solution provided by the present invention has the following beneficial effects:

[0023] In the present invention, a fixed plate and a sealing plate are arranged inside the drain hole, and after water is introduced between the fixed plate and the sealing plate, a sealed space is formed between the fixed plate and the sealing plate, so that the drain hole can be closed to prevent the drain hole from becoming an air leakage channel after drainage. At the same time, a first drain hole and a second drain hole are arranged on the fixed plate and the sealing plate, and a first sealing plate and a second sealing plate that can close or open the first drain hole and the second drain hole are arranged below the first drain hole and the second drain hole. During use, the states of the first drain hole and the second drain hole can be adjusted according to actual needs, and can be adjusted in time according to actual work needs to meet the needs of the drain hole under different working states.

[0024] In the present invention, the sliding piston and the connecting pipe are both provided with a one-way valve that only allows the air inside the extrusion space to flow into the sealed airbag, and the sealed airbag is also provided with an electromagnetic control valve for exhausting gas; in the process of using the equipment to block the drain hole, by driving the connecting shaft to move up and down, the sliding piston can compress the air inside the extrusion space, and the high-pressure air can enter the sealed airbag, so that the sealed airbag is fully inflated, and has a better sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0026] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0027] Figure 2 It is a schematic diagram of the structure of the present invention from a bottom-up perspective;

[0028] Figure 3 It is a schematic diagram of the overall structure of the present invention without the sealing component;

[0029] Figure 4 It is a schematic diagram of the overall structure of the sealing assembly of the present invention;

[0030] Figure 5 It is a schematic diagram of a half-section structure of the present invention;

[0031] Figure 6 It is a side view of a half-section structure of the present invention;

[0032] Figure 7 For the present invention Figure 6 A local enlarged structural schematic diagram;

[0033] Figure 8 It is an exploded view of the top installation structure of the fixing plate of the present invention;

[0034] Fig. 9 For the present invention Figure 8 Schematic diagram of the local enlarged structure at point B.

[0035] The numbers in the figure represent:

[0036] 1. Fixed plate; 101. First water discharge hole; 102. Guide groove; 11. Extending plate; 12. Sliding rod; 13. Limiting plate; 14. Elastic member; 2. Connecting tube; 201. Guide opening;

[0037] 3. Sealing plate; 301. Second water discharge hole; 31. Mounting frame; 32. Sealing airbag; 33. Connecting pipe;

[0038] 4. Sealing assembly; 41. First sealing plate; 4101. Mounting through hole; 42. Second sealing plate; 4201. Limiting groove; 43. Connecting shaft; 4301. Mounting groove; 431. Sliding piston; 4311. One-way valve; 432. Pushing block; 433. Elastic component;

[0039] 5. Lifting assembly; 51. Hydraulic telescopic rod; 52. Support frame. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are 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 creative work are within the scope of protection of the present invention.

[0041] The present invention will be further described below in conjunction with the embodiments.

[0042] When using the leakage plugging device for the drainage hole in the goaf area of ​​a coal mine, in order to prevent the drainage hole from becoming an air leakage channel after drainage, a leakage plugging device is usually used to close the drainage hole.

[0043] To this end, an embodiment of the present invention provides a device for plugging air leakage in drainage holes in goaf areas of coal mines, the purpose of which is at least to, by arranging a fixed plate 1 and a sealing plate 3 inside the drainage hole, after water is introduced between the fixed plate 1 and the sealing plate 3, a sealed space is formed between the fixed plate 1 and the sealing plate 3, the drainage hole can be closed, and the drainage hole is prevented from becoming an air leakage channel after drainage, and at the same time, by arranging a first drainage hole 101 and a second drainage hole 301 on the fixed plate 1 and the sealing plate 3, and arranging a first sealing plate 41 and a second sealing plate 42 below the first drainage hole 101 and the second drainage hole 301, which can close or open the first drainage hole 101 and the second drainage hole 301, during use, the states of the first drainage hole 101 and the second drainage hole 301 can be adjusted according to actual needs (to close the drainage hole to prevent air leakage or to open the drainage hole to drain water), and can be adjusted in time according to actual work needs to meet the needs of the drainage hole under different working conditions.

[0044] Embodiment: A device for plugging air leakage in water leakage holes in coal mine goaf, such as Figure 1-Figure 4 As shown, it includes a fixing plate 1, which is fixedly installed at the opening of the drain hole;

[0045] The sealing disk 3 is installed below the fixed disk 1, and a connecting tube 2 is fixedly installed above the fixing disk 1. The upper part of the connecting tube 2 is connected to the bottom of the fixing disk 1, and a sealed space is formed between the fixing disk 1 and the sealing disk 3. The fixing disk 1 and the sealing disk 3 are respectively provided with a first water hole 101 and a second water hole 301;

[0046] The sealing assembly 4 is used to seal the first water hole 101 and the second water hole 301, and includes a first sealing plate 41 and a second sealing plate 42 that are spaced apart from each other. A connecting shaft 43 is coaxially arranged between the first sealing plate 41 and the second sealing plate 42. The connecting shaft 43 is slidably installed inside the connecting tube 2 up and down, and the top of the connecting shaft 43 extends out of the first sealing plate 41. A lifting assembly 5 for driving the connecting shaft 43 to move up and down is fixedly installed above the fixed plate 1; the lifting assembly 5 includes two hydraulic telescopic rods 51 fixedly installed on both sides of the fixed plate 1, and the tops of the two hydraulic telescopic rods 51 are commonly connected to a support frame 52, and the middle part of the support frame 52 is connected to the connecting shaft 43.

[0047] In the present invention, by arranging a fixed plate 1 and a sealing plate 3 inside the drain hole, after water is passed between the fixed plate 1 and the sealing plate 3, a sealed space is formed between the fixed plate 1 and the sealing plate 3, the drain hole can be closed to prevent the drain hole from becoming an air leakage channel after drainage, and at the same time, by arranging a first drain hole 101 and a second drain hole 301 on the fixed plate 1 and the sealing plate 3, and arranging a first sealing plate 41 and a second sealing plate 42 below the first drain hole 101 and the second drain hole 301 that can close or open the first drain hole 101 and the second drain hole 301, during use, the states of the first drain hole 101 and the second drain hole 301 can be adjusted according to actual needs (to close the drain hole to prevent air leakage or to open the drain hole for water drainage), and can be adjusted in time according to actual work needs to meet the needs of the drain hole in different working states; during the drainage process of the coal mine, the drain hole is opened to drain water, and the drain hole is closed in the non-drainage state to avoid air leakage.

[0048] Furthermore, if Figure 1 , Figure 2 As shown, a protruding plate 11 is fixedly mounted on the outer side of the fixing plate 1 , and a cylindrical structure inserted into the drain hole is formed below the fixing plate 1 .

[0049] Among them, by arranging a cylinder inserted into the drain hole under the fixed plate 1, the inner wall of the drain hole can be conveniently supported, which can prevent the opening of the drain hole from collapsing during drainage, thereby ensuring the stability of the installation position of the fixed plate 1.

[0050] Furthermore, if Figure 1 , Figure 2 As shown, a mounting frame 31 is arranged on the outer side of the sealing disk 3, an annular groove is formed on the outer peripheral surface of the mounting frame 31, and a sealing airbag 32 is arranged inside the annular groove.

[0051] Among them, by arranging a sealing airbag 32 on the outside of the mounting frame 31, the sealing airbag 32 directly contacts the inner wall of the drain hole, so that when the drain hole is blocked, water can be conveniently injected into the sealed space to prevent the water in the sealed space from flowing along the outer edge of the mounting frame 31.

[0052] Furthermore, if Figure 3 , Figure 4 As shown, a sliding piston 431 is fixedly installed on the outer side of the connecting shaft 43, and the outer peripheral surface of the sliding piston 431 is sealed and slidably connected to the inner wall of the connecting tube 2. An extrusion space is formed between the connecting shaft 43 and the connecting tube 2. A connecting pipe 33 is provided at the bottom of the pressurized space, and the connecting pipe 33 is used to fill gas into the interior of the sealing airbag 32.

[0053] Among them, the sliding piston 431 and the connecting pipe 33 are both provided with a one-way valve 4311 that only allows the air inside the extrusion space to flow into the sealed airbag 32, and the sealed airbag 32 is also provided with an electromagnetic control valve for exhausting gas; in the process of using the equipment to block the drain hole, by driving the connecting shaft 43 to move up and down, the sliding piston 431 can compress the air inside the extrusion space, and can allow high-pressure air to enter the sealed airbag 32, so that the sealed airbag 32 is fully inflated, and has a better sealing effect.

[0054] Furthermore, if Figure 5 , Figure 6 As shown, the connecting cylinder 2 is provided with guide openings 201 on all sides, the connecting shaft 43 is fixedly provided with connecting arms extending out of the guide openings 201 on all sides, and the first sealing disk 41 is connected to the connecting shaft 43 via the connecting arms.

[0055] When the connecting shaft 43 moves up and down, the first sealing disk 41 can be conveniently driven to move up and down through the connecting arm, and the guide opening 201 can limit the connecting arm so that the first sealing disk 41 can only move up and down.

[0056] Furthermore, if Figure 4 , Figure 5 As shown, a plurality of protruding blocks are fixedly installed above the first sealing plate 41 and the second sealing plate 42, and the shapes of the protruding blocks correspond to the shapes of the first water hole 101 and the second water hole 301 respectively. When the first sealing plate 41 and the second sealing plate 42 block the first water hole 101 and the second water hole 301, the protruding blocks above the first sealing plate 41 and the second sealing plate 42 pass through the first water hole 101 and the second water hole 301 respectively.

[0057] Among them, by fixing a plurality of raised blocks on the first sealing plate 41 and the second sealing plate 42, the first water hole 101 and the second water hole 301 are sealed by the raised blocks passing through the first water hole 101 and the second water hole 301, so that the sealing performance at the first water hole 101 and the second water hole 301 can be improved, thereby preventing the first water hole 101 and the second water hole 301 from leaking when they are blocked.

[0058] In addition, a mounting through hole 4101 is provided on the first sealing disk 41 , and the mounting through hole 4101 is used for the connecting pipe 33 to pass through.

[0059] Furthermore, if Figure 4 As shown, a limiting groove 4201 is arranged on the side of the raised block of the first sealing disk 41, a limiting plate 13 for being clamped on the limiting groove 4201 is arranged on the fixed disk 1, and a sliding rod 12 for driving the limiting plate 13 to be clamped inside the limiting groove 4201 is arranged on the side of the limiting plate 13.

[0060] Among them, by setting a limiting groove 4201 on the side of the raised block of the first sealing disk 41 and using the limiting plate 13 for limiting, the first sealing disk 41 and the second sealing disk 42 can be tightly pressed at the first water hole 101 and the second water hole 301 in the sealing working state. The limiting plate 13 can also support the entire sealing assembly 4, lock the position of the sealing assembly 4, and prevent the sealing assembly 4 from sliding downward under the action of gravity.

[0061] Furthermore, if Figure 8 , Fig. 9 As shown, a plurality of guide grooves 102 are radially arranged on the fixed disk 1, and the guide grooves 102 are used to guide the radial sliding of the sliding rod 12 on the fixed disk 1. Each group of the limit plates 13 has two, and the backs of the two limit plates 13 are installed opposite to each other. An elastic member 14 for driving the two limit plates 13 to approach each other is arranged between the two limit plates 13, and the middle part of the elastic member 14 is fixedly installed inside the guide groove 102. When each sliding rod 12 moves toward and away from the center of the fixed disk 1, the two limit plates 13 of each group of limit plates 13 are driven to move away from each other, and the limit plates 13 are driven to be stuck in the limit groove 4201.

[0062] The sliding rod 12 can synchronously drive the two limiting plates 13 to move away from each other, thereby more quickly locking the position of the first sealing disk 41 and locking the protruding blocks above the two adjacent first sealing disks 41 at the same time.

[0063] Furthermore, if Figure 8 , Fig. 9As shown, a first wedge block 131 is provided on the upper end surface of the limit plate 13, and second wedge blocks 131 are provided on both sides of the sliding rod 12. The inclined surfaces of the first wedge block 131 and the second wedge block 121 are parallel to each other, and a pushing component for driving the sliding rod 12 to move away from the center of the fixed disk 1 is provided on the side of the connecting shaft 43.

[0064] The inclined surfaces of the first wedge block 131 and the second wedge block 121 are parallel to each other. When the sliding rod 12 is pushed, the inclined surface of the second wedge block 121 will press against the inclined surface of the first wedge block 131, driving the two relatively placed limit plates 13 to move away from each other.

[0065] Furthermore, if Figure 7 , Figure 8 , Fig. 9 As shown, a plurality of mounting grooves 4301 are provided on the side of the connecting shaft 43, and the pushing assembly is installed inside the mounting groove 4301. The pushing assembly includes a pushing block 432 and an elastic component 433. The elastic component 433 is fixedly installed inside the mounting groove 4301, and one end of the elastic component 433 is fixedly connected to the pushing block 432.

[0066] Among them, by setting a pushing block 432 on the outer side of the connecting shaft 43, when the pushing block 432 moves downward with the connecting shaft 43, the pushing block 432 is received into the installation groove 4301, and then when the connecting shaft 43 moves upward to the top, the elastic potential energy of the tail of the pushing block 432 is released, and the elastic component 433 at the tail of the pushing block 432 will make the pushing block 432 move toward the direction of the sliding rod 12, thereby pushing the sliding rod 12 to guide the limiting plate 13 to lock the position of the first sealing disk 41.

[0067] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A device for plugging air leakage in water leakage holes in coal mine goaf, characterized in that: include: A fixed plate (1) is fixedly mounted at the opening of the drain hole; The sealing disk (3) is installed below the fixed disk (1), and a connecting tube (2) is fixedly installed above the fixing disk (1). The top of the connecting tube (2) is connected to the bottom of the fixing disk (1), and a sealed space is formed between the fixing disk (1) and the sealing disk (3). The fixing disk (1) and the sealing disk (3) are respectively provided with a first water discharge hole (101) and a second water discharge hole (301); A sealing assembly (4) is used for sealing the first water discharge hole (101) and the second water discharge hole (301), and comprises a first sealing plate (41) and a second sealing plate (42) which are spaced apart from each other in an upper and lower direction, wherein a connecting shaft (43) is coaxially arranged between the first sealing plate (41) and the second sealing plate (42), and the connecting shaft (43) is slidably mounted in the connecting tube (2) in an upper and lower direction, and the top of the connecting shaft (43) extends out of the first sealing plate (41), and a lifting assembly (5) for driving the connecting shaft (43) to move up and down is fixedly mounted above the fixed plate (1).

2. A device for plugging air leakage in water leakage holes in coal mine goaf according to claim 1, characterized in that: A protruding plate (11) is fixedly mounted on the outer side of the fixed plate (1), and a cylindrical structure inserted into the drain hole is formed below the fixed plate (1).

3. The device for plugging air leakage in water leakage holes in coal mine goaf according to claim 1, characterized in that: A mounting frame (31) is arranged outside the sealing disk (3), an annular groove is formed on the outer peripheral surface of the mounting frame (31), and a sealing air bag (32) is arranged inside the annular groove.

4. The device for plugging air leakage in water leakage holes in coal mine goaf according to claim 1, characterized in that: A sliding piston (431) is fixedly mounted on the outer side of the connecting shaft (43), and the outer peripheral surface of the sliding piston (431) is sealingly slidably connected to the inner wall of the connecting cylinder (2). An extrusion space is formed between the connecting shaft (43) and the connecting cylinder (2), and a connecting pipe (33) is provided at the bottom of the pressurized space. The connecting pipe (33) is used to fill gas into the interior of the sealing airbag (32).

5. The device for plugging air leakage in water leakage holes in coal mine goaf according to claim 1, characterized in that: The connecting cylinder (2) is provided with guide openings (201) on all four sides, and the connecting shaft (43) is fixedly provided with connecting arms extending out of the guide openings (201) on all four sides, and the first sealing disk (41) is connected to the connecting shaft (43) via the connecting arms.

6. The device for plugging air leakage in water leakage holes in coal mine goaf according to claim 1, characterized in that: A plurality of protruding blocks are fixedly mounted above the first sealing plate (41) and the second sealing plate (42), and the shapes of the protruding blocks correspond to the shapes of the first water discharge hole (101) and the second water discharge hole (301), respectively. When the first sealing plate (41) and the second sealing plate (42) block the first water discharge hole (101) and the second water discharge hole (301), the protruding blocks above the first sealing plate (41) and the second sealing plate (42) pass through the first water discharge hole (101) and the second water discharge hole (301), respectively.

7. A device for plugging air leakage in water leakage holes in coal mine goaf according to claim 6, characterized in that: A limiting groove (4201) is arranged on the side of the raised block of the first sealing disk (41), a limiting plate (13) for being clamped on the limiting groove (4201) is arranged on the fixed disk (1), and a sliding rod (12) for driving the limiting plate (13) to be clamped inside the limiting groove (4201) is arranged on the side of the limiting plate (13).

8. The device for plugging air leakage in water leakage holes in coal mine goaf according to claim 7, characterized in that: A plurality of guide grooves (102) are radially arranged on the fixed disk (1), and the guide grooves (102) are used to guide the radial sliding of the sliding rod (12) on the fixed disk (1). Each group of the limiting plates (13) has two plates, and the backs of the two limiting plates (13) are mounted opposite to each other. An elastic member (14) is arranged between the two limiting plates (13) for driving the two limiting plates (13) to move closer to each other. The middle part of the elastic member (14) is fixedly installed inside the guide groove (102). When each sliding rod (12) moves away from the center of the fixed disk (1), the two limiting plates (13) of each group of limiting plates (13) are driven to move away from each other, and the limiting plates (13) are driven to be stuck in the limiting groove (4201).

9. A device for plugging air leakage in water leakage holes in coal mine goaf according to claim 8, characterized in that: The upper end surface of the limiting plate (13) is provided with a first wedge block (131), and the two sides of the sliding rod (12) are provided with second wedge blocks (131), and the inclined surfaces of the first wedge block (131) and the second wedge block (121) are parallel to each other. The side surface of the connecting shaft (43) is provided with a pushing component for driving the sliding rod (12) to move away from the center of the fixed plate (1).

10. A device for plugging air leakage at water leakage holes in coal mine goaf according to claim 9, characterized in that: A plurality of mounting grooves (4301) are provided on the side of the connecting shaft (43), the pushing assembly is installed inside the mounting groove (4301), the pushing assembly comprises a pushing block (432) and an elastic component (433), the elastic component (433) is fixedly installed inside the mounting groove (4301), and one end of the elastic component (433) is fixedly connected to the pushing block (432).

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