Safe hydraulic fracturing method and device for coal mine roof

Abstract

The invention relates to the technical field of coal mine hydraulic fracturing, and discloses a coal mine roof safety hydraulic fracturing method and device. The hole sealing mechanism is arranged at one end of the water inlet pipe, and the hole sealing mechanism is used for sealing an open hole in a rock stratum through an expansion bag in the hole sealing mechanism; the water spraying mechanism is installed between every two adjacent hole sealing mechanisms, and the water spraying mechanism sprays water through a water spraying steel pipe in the water spraying mechanism; the supporting mechanism is arranged on the water spraying mechanism; by arranging the water spraying mechanism, when high-pressure water flow is sprayed out from the water spraying holes, blades above the water spraying holes are impacted, the blades are impacted to drive a rotating mounting piece to rotate on a top rotating frame, the rotating mounting piece drives a protection piece to rotate rapidly, the bottom end of the protection piece extends into a water spraying steel pipe, and the water spraying holes can be stirred; impurities injected into liquid are scattered, and the situation that water spraying holes are blocked due to impurity clustering is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of hydraulic fracturing of coal mines, and in particular to a method and a device for safe hydraulic fracturing of a coal mine roof. Background Art

[0002] Hydraulic fracturing of coal mine roof is a technology used to control the stability of coal mine roof in coal mining. This technology is mainly used in fully mechanized mining working faces, especially for those hard roofs that are difficult to collapse. Hydraulic fracturing technology can effectively weaken the roof rock layer. Hydraulic fracturing technology achieves the purpose of weakening the roof by fracturing the roof rock to generate multiple cracks and eventually form a crack network. This method can destroy the integrity of the roof surrounding rock and reduce the strength of the rock mass. When using hydraulic fracturing technology, the water spray pipe is fixedly installed in the opening on the rock formation through an expander and the opening is sealed. The water spray pipe sprays high-pressure water to fracture the opening in the rock formation. During the hydraulic fracturing process, impurities in the high-pressure injected liquid may cause blockage to the water spray port and affect the injection of the liquid. Summary of the invention

[0003] The object of the present invention is to provide a method and device for safe hydraulic fracturing of coal mine roof to solve the problems raised in the above-mentioned background technology.

[0004] To achieve the above object, the present invention provides the following technical solutions: A method and device for safe hydraulic fracturing of a coal mine roof, comprising a water inlet pipe; The sealing mechanism is arranged at one end of the water inlet pipe, and the sealing mechanism seals the opening on the rock formation through the expansion bag therein; A water spraying mechanism, the water spraying mechanism is installed between two adjacent sealing mechanisms, and the water spraying mechanism sprays water through the water spraying steel pipe therein; A support mechanism, wherein the support mechanism is arranged on the water spray mechanism, and the support mechanism positions the position of the water spray mechanism in the opening on the rock formation through a first support plate and a second support plate; The water spraying mechanism includes a water spraying steel pipe, a plurality of water spraying holes, a plurality of bottom rotating frames, a protective tube, a plurality of top rotating frames, a rotating mounting part, a fixed ring, a plurality of blades and a plurality of protective parts, a plurality of the water spraying holes are opened on the outer wall of the water spraying steel pipe, a plurality of the bottom rotating frames are fixedly mounted on the outer wall of the water spraying steel pipe, the protective tube is fixedly mounted on the outer wall of the water spraying steel pipe, a plurality of the top rotating frames are fixedly mounted on the inner wall of the protective tube, the rotating mounting part is rotatably mounted on the inner wall of the top rotating frame, the fixed ring is fixedly mounted on the bottom end of the rotating mounting part, a plurality of the blades are arranged at the bottom of the rotating mounting part, and a plurality of the protective parts are fixedly mounted on the bottom end of the fixed ring.

[0005] Optionally, the rotating mounting member is in a cross shape, and water diversion blocks are fixedly mounted on both ends of the rotating mounting member, and the water diversion blocks are in a triangular shape.

[0006] Optionally, the outer wall of the protective tube is provided with a plurality of holes, the holes correspond to the water spray holes on the water spray steel pipe, the position of the top rotating frame corresponds to the holes, the position of the bottom rotating frame corresponds to the water spray holes, and the protective member is rotatably installed on the top of the bottom rotating frame.

[0007] Optionally, the blade is fixedly mounted on the bottom of the rotating mounting member corresponding to the bottom end of the water diversion block, and the blade is inclinedly arranged on the water diversion block.

[0008] Optionally, the sealing mechanism includes a sealer cylinder, a solenoid valve, an expansion bag, a mounting ring, a protective bag and several damping rings, the expansion bag is fixedly mounted on the outer wall of the sealer cylinder, the solenoid valve is fixedly mounted on the inner wall of the sealer cylinder, and one end of the solenoid valve outlet extends between the expansion bag and the outer wall of the sealer cylinder, the mounting ring is fixedly mounted on both ends of the protective bag, and the mounting ring is fixedly mounted on both ends of the outer wall of the sealer cylinder by screws, and several damping rings are integrally formed with the outer wall of the protective bag.

[0009] Optionally, a plurality of fixing grooves are formed on the inner surface of the protective bag, and a plurality of fixing protrusions are integrally formed on the outer wall of the expansion bag, and the fixing protrusions are engaged with the corresponding fixing grooves.

[0010] Optionally, the hole sealer cylinder and the water inlet pipe connecting end are threadedly connected, and the hole sealer cylinder and the corresponding water spraying steel pipe connecting end are threadedly connected, and one end of one of the hole sealer cylinders is threadedly connected to a top water spraying cylinder.

[0011] Optionally, the supporting mechanism includes an installation frame, a waterproof frame, a motor, a mechanical seal, a screw, two installation blocks, a first support plate, a connecting frame, a second support plate, a connecting piece and a mounting seat, the installation frame is fixedly installed on both sides of the outer wall of the protective tube, the waterproof frame and the mounting seat are fixedly installed on one side of the installation frame, the motor is fixedly installed on the inner wall of the waterproof frame, the motor output end extends to the outside of the waterproof frame, the mechanical seal is arranged at the connection between the motor output end and the waterproof frame, the screw is fixedly installed on the motor output end, and the other end of the screw is rotatably installed on one side of the mounting seat, the two mounting blocks are threadedly connected to the outer wall of the screw through the threaded holes thereon, the first support plate and the second support plate are respectively rotatably installed on one side of the corresponding mounting blocks, the connecting frame is fixedly installed on one end of the first support plate, the connecting piece is fixedly installed on one end of the second support plate, and the connecting piece is rotatably installed on the inner wall of the connecting frame.

[0012] Optionally, the threads at both ends of the screw rod are opposite with the middle as the boundary, and two mounting blocks are respectively arranged at both ends of the screw rod. Mounting grooves are opened on one side of the first support plate and the second support plate. A fixing plate is installed on the wall of the mounting groove by rotation of a torsion spring, and a plurality of clamping blocks are fixedly installed on one side of the fixing plate.

[0013] A method for using a coal mine roof safety hydraulic fracturing device comprises the following steps: S1, the sealing device cylinder and the water spraying steel pipe are inserted into the rock formation opening; S2, the pump body pumps water and injects it between the expansion bag and the outer wall of the sealing device cylinder, so that the expansion bag expands and gets stuck on the inner wall of the hole in the rock formation; S3. The fracturing pump group outputs high-pressure water flow, which is transported to the water spraying steel pipe through the hollow part of the sealer cylinder and sprayed out from the water spraying hole to fractur the opening of the rock formation.

[0014] The present invention has at least the following beneficial effects: (1) This scheme sets a water spray mechanism. When the high-pressure water flow is sprayed out from the water spray hole, it impacts the blades above the water spray hole. The blades are impacted and drive the rotating mounting parts to rotate on the top rotating frame. The rotating mounting parts drive the protective parts to rotate rapidly. The bottom end of the protective parts extends to the inside of the water spray steel pipe, which can stir the water spray hole, break up the impurities in the injected liquid, and reduce the situation where the impurities clumping together blocks the water spray hole. (2) This solution provides a protective bag to protect the expansion bag, and the fixing groove on the protective bag is engaged with the fixing protrusion on the outer wall of the expansion bag, so that the protective bag can be more closely attached to the outer surface of the expansion bag. The protective bag is installed on the cylinder of the hole sealer through a mounting ring, which is convenient for replacing the protective bag; (3) In this solution, the motor starts to drive the screw to rotate, and the screw drives the two mounting blocks to move synchronously in opposite directions. The first support plate and the second support plate are slidably mounted on the inner wall of the mounting frame, and the inner wall of the mounting frame limits the first support plate and the second support plate. The first support plate and the second support plate change the angle between them as the mounting block moves, so that the connection between the first support plate and the second support plate is supported on the inner wall of the rock formation opening, which can better fix the water spraying steel pipe and improve the stability of the water spraying steel pipe; (4) When the connection between the first support plate and the second support plate of the present solution is supported on the inner wall of the rock formation opening, the torsion spring supports the fixing plate to pop out, one side of the fixing plate is attached to the inner wall of the rock formation opening, and the clamping block is inserted into the gap of the inner wall of the rock formation opening, which can increase the fixing effect of the water spraying steel pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 This is a cross-sectional view of the water spray steel pipe of the present invention; Figure 3 This is the installation diagram of the protective element of the present invention; Figure 4 This is the installation diagram of the rotating mounting member of the present invention; Figure 5 This is the installation diagram of the protective bag of the present invention; Figure 6 This is an installation diagram of the first support plate and the second support plate of the present invention.

[0016] In the accompanying drawings, the components represented by the reference numerals are listed as follows: 1. Sealer cylinder; 101. Solenoid valve; 102. Expansion bag; 103. Fixed convex block; 104. Mounting ring; 105. Protective bag; 106. Damping ring; 107. Water inlet pipe; 108. Top water spray barrel; 2. Water spray steel pipe; 201. Water spray hole; 202. Bottom rotating frame; 203. Protective cylinder; 204. Top rotating frame; 3. Rotating mounting part; 301. Water diversion block; 302. Fixed ring; 303. Blade; 304. Protective part; 4. Mounting frame; 401. Waterproof frame; 402. Motor; 403. Mechanical seal; 404. Screw; 405. Mounting block; 406. First support plate; 407. Connecting frame; 408. Second support plate; 409. Connecting part; 410. Mounting seat; 5. Mounting groove; 501. Fixed plate; 502. Block. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments 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 creative work are within the scope of protection of the present invention.

[0018] See also Figure 1-Figure 6The present invention provides a method and device for safe hydraulic fracturing of a coal mine roof, comprising a water inlet pipe 107; a sealing mechanism, the sealing mechanism is arranged at one end of the water inlet pipe 107, and the sealing mechanism seals the opening on the rock formation through the expansion bag 102 therein; a water spraying mechanism, the water spraying mechanism is installed between two adjacent sealing mechanisms, and the water spraying mechanism sprays water through the water spraying steel pipe 2 therein; a supporting mechanism, the supporting mechanism is arranged on the water spraying mechanism, and the supporting mechanism positions the position of the water spraying mechanism in the opening on the rock formation through the first supporting plate 406 and the second supporting plate 408 therein; the water spraying mechanism comprises a water spraying steel pipe 2, a plurality of water spraying holes 201, a plurality of bottom rotating frames 202, a protective tube 203, a plurality of top rotating frames 204, a rotating mounting member 3, a fixing ring 302, a plurality of blades 303 and a plurality of protective members 304, a plurality of water spraying holes 201 are opened on the outer wall of the water spraying steel pipe 2, a plurality of bottom rotating frames 202 ... plurality of top rotating frames 204, a plurality of top rotating frames 204, a plurality of top rotating frames 204, a plurality of top rotating frames 204, a plurality of top rotating frames 204, a plurality of top rotating frames 204, a plurality of top rotating frames 204, a plurality of top rotating frames 204, a plurality of top rotating frames 204, a plurality of top rotating frames 204, a plurality The frame 202 is fixedly installed on the outer wall of the water spraying steel pipe 2, the protective tube 203 is fixedly installed on the outer wall of the water spraying steel pipe 2, a plurality of top rotating frames 204 are fixedly installed on the inner wall of the protective tube 203, the rotating mounting member 3 is rotatably installed on the inner wall of the top rotating frame 204, the fixed ring 302 is fixedly installed on the bottom end of the rotating mounting member 3, a plurality of blades 303 are arranged at the bottom of the rotating mounting member 3, and a plurality of protective members 304 are fixedly installed on the bottom end of the fixed ring 302; by setting up a water spraying mechanism, when the high-pressure water flow is sprayed out from the water spraying hole 201, it impacts the blades 303 above the water spraying hole 201, and the blades 303 are impacted to drive the rotating mounting member 3 to rotate on the top rotating frame 204, and the rotating mounting member 3 drives the protective member 304 to rotate rapidly, and the bottom end of the protective member 304 extends to the inside of the water spraying steel pipe 2, which can stir the water spraying hole 201, break up impurities in the injected liquid, and reduce the situation where impurities clumping and blocking the water spraying hole 201.

[0019] In some embodiments, see Figure 3 The rotating mounting member 3 is in a cross shape, and water diversion blocks 301 are fixedly installed at both ends of the rotating mounting member 3, and the water diversion blocks 301 are triangular; by setting the water diversion blocks 301, the water diversion blocks 301 are triangular, and the impact force of the water flow on the rotating mounting member 3 can be reduced.

[0020] In some embodiments, see Figure 2 , Figure 4 A plurality of holes are provided on the outer wall of the protective tube 203, and the holes correspond to the water spray holes 201 on the water spray steel pipe 2. The position of the top rotating frame 204 corresponds to the holes, and the position of the bottom rotating frame 202 corresponds to the water spray holes 201. The protective member 304 is rotatably mounted on the top of the bottom rotating frame 202, and the blade 303 is fixedly mounted on the bottom end of the corresponding water diversion block 301 at the bottom of the rotating mounting member 3. The blade 303 is inclined on the water diversion block 301; by setting the blade 303, the high-pressure water flow impacts the inclined side of the blade 303, driving the rotating mounting member 3 to rotate.

[0021] In some embodiments, see Figure 5 The sealing mechanism includes a sealing device cylinder 1, a solenoid valve 101, an expansion bag 102, a mounting ring 104, a protective bag 105 and a plurality of damping rings 106. The expansion bag 102 is fixedly mounted on the outer wall of the sealing device cylinder 1, the solenoid valve 101 is fixedly mounted on the inner wall of the sealing device cylinder 1, and one end of the outlet of the solenoid valve 101 extends between the expansion bag 102 and the outer wall of the sealing device cylinder 1, the mounting ring 104 is fixedly mounted on both ends of the protective bag 105, and the mounting ring 104 is fixedly mounted on both ends of the outer wall of the sealing device cylinder 1 by screws. 06 is integrally formed with the outer wall of the protection bag 105, and a plurality of fixing grooves are provided on the inner surface of the protection bag 105. A plurality of fixing protrusions 103 are integrally formed on the outer wall of the expansion bag 102, and the fixing protrusions 103 are engaged with the corresponding fixing grooves. One end of the inlet of the solenoid valve 101 is connected to a connecting pipe, and one end of the connecting pipe is connected to a pump body. Water is pumped by the pump body and injected into the space between the expansion bag 102 and the outer wall of the sealing device cylinder 1, so that the expansion bag 102 expands and is stuck on the inner wall of the hole opened in the rock formation, thereby sealing the hole in the rock formation and fixing the position of the water spraying steel pipe 2.

[0022] In this example, a protective bag 105 is provided to protect the expansion bag 102, and the fixing groove on the protective bag 105 is engaged with the fixing protrusion 103 on the outer wall of the expansion bag 102, so that the protective bag 105 can fit more closely to the outer surface of the expansion bag 102. The protective bag 105 is installed on the sealer cylinder 1 by the mounting ring 104, which facilitates the replacement of the protective bag 105.

[0023] In some embodiments, see Figure 6The sealing device cylinder 1 and the water inlet pipe 107 are connected by threads, and the sealing device cylinder 1 and the corresponding water spraying steel pipe 2 are connected by threads. One end of the sealing device cylinder 1 is threadedly connected with the top water spraying cylinder 108. The supporting mechanism includes a mounting frame 4, a waterproof frame 401, a motor 402, a mechanical seal 403, a screw rod 404, two mounting blocks 405, a first supporting plate 406, a connecting frame 407, a second supporting plate 408, a connecting piece 409 and a mounting seat 410. The mounting frame 4 is fixedly mounted on the waterproof frame 401. On both sides of the outer wall of the casing 203, the waterproof frame 401 and the mounting seat 410 are fixedly installed on one side of the mounting frame 4, the motor 402 is fixedly installed on the inner wall of the waterproof frame 401, the output end of the motor 402 extends to the outside of the waterproof frame 401, the mechanical seal 403 is arranged at the connection between the output end of the motor 402 and the waterproof frame 401, the screw rod 404 is fixedly installed on the output end of the motor 402, and the other end of the screw rod 404 is rotatably installed on one side of the mounting seat 410, and the two mounting blocks 405 are threadedly connected to the screw rod 404 through the threaded holes thereon The outer wall, the first support plate 406 and the second support plate 408 are respectively rotatably installed on one side of the corresponding mounting block 405, the connecting frame 407 is fixedly installed at one end of the first support plate 406, the connecting piece 409 is fixedly installed at one end of the second support plate 408, and the connecting piece 409 is rotatably installed on the inner wall of the connecting frame 407; the motor 402 is waterproofed by setting a waterproof frame 401 and a mechanical seal 403. The motor 402 can be a servo motor. The motor 402 is started to drive the screw rod 404 to rotate, and the screw rod 404 drives the two The mounting block 405 moves in the opposite direction synchronously, and the first support plate 406 and the second support plate 408 are slidably installed on the inner wall of the mounting frame 4, and the inner wall of the mounting frame 4 limits the first support plate 406 and the second support plate 408. The first support plate 406 and the second support plate 408 change the angle between them as the mounting block 405 moves, so that the connection between the first support plate 406 and the second support plate 408 is supported on the inner wall of the rock formation opening, which can better fix the water spraying steel pipe 2 and improve the stability of the water spraying steel pipe 2.

[0024] For further information, please refer again to Figure 6 The threads of the two ends of the screw rod 404 are opposite to each other with the middle as the boundary, and two mounting blocks 405 are respectively arranged at the two ends of the screw rod 404. A mounting groove 5 is opened on one side of the first support plate 406 and the second support plate 408. A fixing plate 501 is installed on the groove wall of the mounting groove 5 by rotating through a torsion spring, and a plurality of clamping blocks 502 are fixedly installed on one side of the fixing plate 501; when the connection between the first support plate 406 and the second support plate 408 is supported on the inner wall of the rock formation opening, the torsion spring supports the fixing plate 501 to pop out, and one side of the fixing plate 501 is attached to the inner wall of the rock formation opening, and the clamping block 502 is inserted into the gap of the inner wall of the rock formation opening, which can increase the fixing effect of the water spraying steel pipe 2.

[0025] The method of using the hydraulic fracturing device of the present invention is as follows: when the sealer cylinder 1 and the water spraying steel pipe 2 are inserted into the rock formation opening, the pump body draws water and injects it between the expansion bag 102 and the outer wall of the sealer cylinder 1, so that the expansion bag 102 expands and is stuck on the inner wall of the rock formation opening, thereby sealing the rock formation opening and fixing the position of the water spraying steel pipe 2. One end of the water inlet pipe 107 is connected to a fracturing pump group in the prior art, and the fracturing pump group outputs a high-pressure water flow, which is transported to the water spraying steel pipe 2 through the hollow part of the sealer cylinder 1 and sprayed out from the water spraying hole 201 to fractur the rock formation opening.

[0026] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0027] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A coal mine roof safety hydraulic fracturing device, characterized in that: include: Water inlet pipe (107); The sealing mechanism is arranged at one end of the water inlet pipe (107), and the sealing mechanism seals the opening on the rock formation through the expansion bag (102) therein; A water spraying mechanism, the water spraying mechanism being installed between two adjacent sealing mechanisms, the water spraying mechanism spraying water through a water spraying steel pipe (2) therein; A support mechanism, the support mechanism being arranged on the water spray mechanism, the support mechanism positioning the position of the water spray mechanism in the opening on the rock formation through a first support plate (406) and a second support plate (408); The water spray mechanism comprises a water spray steel pipe (2), a plurality of water spray holes (201), a plurality of bottom rotating frames (202), a protective tube (203), a plurality of top rotating frames (204), a rotating mounting member (3), a fixing ring (302), a plurality of blades (303) and a plurality of protective members (304), wherein a plurality of the water spray holes (201) are formed on the outer wall of the water spray steel pipe (2), a plurality of the bottom rotating frames (202) are fixedly mounted on the outer wall of the water spray steel pipe (2), and the protective tube (203) is provided on the outer wall of the water spray steel pipe (2). (203) is fixedly mounted on the outer wall of the water spray steel pipe (2), a plurality of the top rotating frames (204) are fixedly mounted on the inner wall of the protective tube (203), the rotating mounting member (3) is rotatably mounted on the inner wall of the top rotating frame (204), the fixing ring (302) is fixedly mounted on the bottom end of the rotating mounting member (3), a plurality of the blades (303) are arranged at the bottom of the rotating mounting member (3), and a plurality of the protective members (304) are fixedly mounted on the bottom end of the fixing ring (302).

2. A coal mine roof safety hydraulic fracturing device according to claim 1, characterized in that: The rotating mounting member (3) is in the shape of a cross, and water diversion blocks (301) are fixedly mounted on both ends of the rotating mounting member (3), and the water diversion blocks (301) are in the shape of a triangle.

3. A coal mine roof safety hydraulic fracturing device according to claim 1, characterized in that: The outer wall of the protective tube (203) is provided with a plurality of holes, the holes corresponding to the water spray holes (201) on the water spray steel pipe (2), the position of the top rotating frame (204) corresponds to the holes, the position of the bottom rotating frame (202) corresponds to the water spray holes (201), and the protective member (304) is rotatably mounted on the top of the bottom rotating frame (202).

4. A coal mine roof safety hydraulic fracturing device according to claim 2, characterized in that: The blade (303) is fixedly mounted on the bottom of the rotating mounting member (3) corresponding to the bottom end of the water diversion block (301), and the blade (303) is arranged obliquely on the water diversion block (301).

5. A coal mine roof safety hydraulic fracturing device according to claim 1, characterized in that: The hole sealing mechanism comprises a hole sealing device cylinder (1), a solenoid valve (101), an expansion bag (102), a mounting ring (104), a protective bag (105) and a plurality of damping rings (106); the expansion bag (102) is fixedly mounted on the outer wall of the hole sealing device cylinder (1); the solenoid valve (101) is fixedly mounted on the inner wall of the hole sealing device cylinder (1), and one end of the outlet of the solenoid valve (101) extends between the expansion bag (102) and the outer wall of the hole sealing device cylinder (1); the mounting ring (104) is fixedly mounted on both ends of the protective bag (105); the mounting ring (104) is fixedly mounted on both ends of the outer wall of the hole sealing device cylinder (1) by screws; and the plurality of damping rings (106) are integrally formed with the outer wall of the protective bag (105).

6. A coal mine roof safety hydraulic fracturing device according to claim 5, characterized in that: The inner surface of the protective bag (105) is provided with a plurality of fixing grooves, and the outer wall of the expansion bag (102) is integrally formed with a plurality of fixing protrusions (103), the fixing protrusions (103) being engaged with the corresponding fixing grooves.

7. A coal mine roof safety hydraulic fracturing device according to claim 1, characterized in that: The hole sealer cylinder (1) and the connecting end of the water inlet pipe (107) are connected by threads, and the hole sealer cylinder (1) and the corresponding connecting end of the water spraying steel pipe (2) are connected by threads, and one end of one of the hole sealer cylinders (1) is threadedly connected to a top water spraying cylinder (108).

8. A coal mine roof safety hydraulic fracturing device according to claim 1, characterized in that: The support mechanism comprises a mounting frame (4), a waterproof frame (401), a motor (402), a mechanical seal (403), a screw (404), two mounting blocks (405), a first supporting plate (406), a connecting frame (407), a second supporting plate (408), a connecting piece (409) and a mounting seat (410); the mounting frame (4) is fixedly mounted on both sides of the outer wall of the protective tube (203); the waterproof frame (401) and the mounting seat (410) are fixedly mounted on one side of the mounting frame (4); the motor (402) is fixedly mounted on the inner wall of the waterproof frame (401); the output end of the motor (402) extends to the outside of the waterproof frame (401); the mechanical seal (403) is arranged on the motor (410); 02) output end and the waterproof frame (401), the screw rod (404) is fixedly mounted on the output end of the motor (402), the other end of the screw rod (404) is rotatably mounted on one side of the mounting seat (410), the two mounting blocks (405) are threadedly connected to the outer wall of the screw rod (404) through the threaded holes thereon, the first support plate (406) and the second support plate (408) are rotatably mounted on one side of the corresponding mounting blocks (405), the connecting frame (407) is fixedly mounted on one end of the first support plate (406), the connecting member (409) is fixedly mounted on one end of the second support plate (408), and the connecting member (409) is rotatably mounted on the inner wall of the connecting frame (407).

9. A coal mine roof safety hydraulic fracturing device according to claim 8, characterized in that: The screw rod (404) has two opposite threads at the middle, and two mounting blocks (405) are respectively arranged at the two ends of the screw rod (404). The first support plate (406) and the second support plate (408) are both provided with mounting grooves (5) on one side. A fixing plate (501) is rotatably mounted on the groove wall of the mounting groove (5) via a torsion spring, and a plurality of clamping blocks (502) are fixedly mounted on one side of the fixing plate (501).

10. A method for using a coal mine roof safety hydraulic fracturing device according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1, a sealing device cylinder (1) and a water spraying steel pipe (2) are inserted into a rock formation opening; S2, the pump body pumps water and injects it between the expansion bag (102) and the outer wall of the hole sealer cylinder (1), so that the expansion bag (102) expands and gets stuck on the inner wall of the hole in the rock formation; S3, the fracturing pump group outputs a high-pressure water flow, which is transported to the water spraying steel pipe (2) through the hollow part of the sealing device cylinder (1), and sprayed out from the water spraying hole (201) to perform fracturing on the opening of the rock formation.

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