Remote control device and method for hydraulic fracturing coal and rock mass in underground coal mine

Abstract

The invention provides a remote control device and method for coal and rock mass hydraulic fracturing of an underground coal mine, and relates to the technical field of hydraulic fracturing. The remote control device comprises a fracturing rod, a hole packer, a hole packer water injection pipe, a fracturing water injection pipe, a high-pressure water supply end, a control unit, a communication base station and an upper computer. According to the remote control device and method for the hydraulic fracturing coal and rock mass of the underground coal mine, remote control construction of the hydraulic fracturing technology is achieved, construction technicians do not need to conduct construction in a roadway for a long time, practicability and operability are high, construction complexity is greatly reduced, construction cost is low, construction efficiency is high, construction safety is high, and the method is suitable for popularization and application. And the ground stress and the fracture position of the coal rock mass can be accurately obtained, and accurate data support is provided for subsequent mining construction.

Description

Technical Field

[0001] The invention relates to the technical field of hydraulic fracturing, and in particular to a remote control device and method for hydraulic fracturing of coal and rock masses in underground coal mines. Background Art

[0002] As the depth of coal mining increases, the ground stress level in the coal rock mass gradually increases, resulting in increased safety risks in the coal mine production process. In the process of coal mining, the ground stress is measured by hydraulic fracturing of the coal rock mass, and the coal rock mass is depressurized to ensure the safety of coal mining construction and improve resource recovery. Hydraulic fracturing technology injects high-pressure water into the underground coal rock mass, observes the expansion of cracks related to water pressure, and thus measures the distribution and size of ground stress, and depressurizes the coal rock mass by fracturing the coal rock mass with high-pressure water. In recent years, hydraulic fracturing coal rock mass technology has made continuous breakthroughs, including optimization of control systems, improvement of testing equipment, and improvement of data processing methods. These technological advances have provided more powerful support for coal mine safety production. However, in the construction process of hydraulic fracturing technology, multiple construction technicians are still required to carry out on-site construction, the construction cost is high, and the probability of rock burst in high-stress tunnels is high. Long-term construction in high-stress tunnels is highly dangerous. Summary of the invention

[0003] The object of the present invention is to provide a remote control device and method for hydraulic fracturing of coal and rock masses in underground coal mines, so as to realize remote control construction of hydraulic fracturing technology.

[0004] In order to achieve the above object, the technical solutions adopted by the present invention are as follows:

[0005] A remote control device for hydraulic fracturing of coal and rock mass in a coal mine, comprising a fracturing rod, a hole sealer, a water injection pipe for the hole sealer, a fracturing water injection pipe, a high-pressure water supply end, a control unit, a communication base station and a host computer;

[0006] At least two hole sealers are arranged on the fracturing rod, and adjacent hole sealers are spaced at a set distance;

[0007] The hole sealer water injection pipe is connected to a plurality of hole sealer water injection branches, each of which is connected to a hole sealer;

[0008] The fracturing water injection pipe is connected to a plurality of fracturing water injection branch pipes, and the end of each fracturing water injection branch pipe is located between adjacent hole sealers;

[0009] The input end of the hole sealer water injection pipe is provided with a first electromagnetic stop valve and a first pressure gauge, and the input end of the fracturing water injection pipe is provided with a second electromagnetic stop valve and a second pressure gauge;

[0010] The sealing device water injection pipe and the fracturing water injection pipe are connected to one end of the water injection pipe through a tee, and the other end of the water injection pipe is connected to the high-pressure water supply end;

[0011] A flow meter is provided on the water injection main pipe;

[0012] The control unit is signal-connected to the first electromagnetic stop valve, the first pressure gauge, the second electromagnetic stop valve, the second pressure gauge and the flow meter;

[0013] The control unit is connected to the host computer via a communication base station.

[0014] Furthermore, each sealing device water injection branch pipe is provided with a third electromagnetic stop valve, each fracturing water injection branch pipe is provided with a fourth electromagnetic stop valve, and the control unit signal connects the third electromagnetic stop valve and the fourth electromagnetic stop valve.

[0015] Furthermore, the high-pressure water supply end includes a pressurizer, a pump station and a high-pressure air duct, the water inlet end of the pressurizer is connected to the pump station, the water outlet end of the pressurizer is connected to the other end of the water injection pipe, the air inlet end of the pressurizer is connected to the high-pressure air duct, and the control unit signal is connected to the pump station control end.

[0016] Furthermore, a third pressure gauge is provided on the high-pressure air duct, and the control unit signal is connected to the third pressure gauge.

[0017] Furthermore, a fifth electromagnetic stop valve is provided on the high-pressure air duct, and the control unit signal is connected to the fifth electromagnetic stop valve.

[0018] Furthermore, a fifth electromagnetic stop valve is provided on the high-pressure air duct.

[0019] Furthermore, it also includes a water outlet pipe, the water outlet pipe is connected to the water injection main pipe, a sixth electromagnetic stop valve is arranged on the water outlet pipe, and the control unit signal is connected to the sixth electromagnetic stop valve.

[0020] Furthermore, it also includes a temperature measuring optical fiber, which is located between adjacent hole sealers, and is arranged along the axial direction of the fracturing rod, and the control unit signal is connected to the temperature measuring optical fiber.

[0021] A method for remotely controlling hydraulic fracturing of coal and rock mass in a coal mine, using the above-mentioned remotely controlling device for hydraulic fracturing of coal and rock mass in a coal mine, comprises the following steps:

[0022] Step 1: Drilling holes into the surrounding coal rock mass using a drilling rig;

[0023] Step 2: Insert the fracturing rod into the borehole;

[0024] Step 3, open the first electromagnetic stop valve, and inject high-pressure water from the high-pressure water supply end through the hole sealer water injection pipe into the two adjacent hole sealers in sequence to make the hole sealers expand and fit the inner wall of the borehole. After the first pressure gauge monitors that the set pressure value is reached, close the first electromagnetic stop valve, and the first pressure gauge monitors the pressure value and uploads it to the control unit in real time;

[0025] Step 4, open the second electromagnetic stop valve, and inject high-pressure water from the high-pressure water supply end into the adjacent hole sealers through the fracturing water injection pipe in sequence, and monitor the pressure value by the second pressure gauge and upload it to the control unit in real time, and monitor the flow value by the flow meter and upload it to the control unit in real time;

[0026] Step 5, the control unit determines whether the pressure value of the first pressure gauge is within the set range during step 4; if the pressure value of the first pressure gauge is not within the set range, repeat steps 3 and 4; if the pressure value of the first pressure gauge is within the set range, the control unit records the time t0 corresponding to the flow value decreasing to zero and then increasing instantaneously, and the pressure value monitored by the second pressure gauge corresponding to time t0 is the ground stress;

[0027] Step 6: Use the temperature measuring optical fiber to measure the temperature at different positions of the borehole between adjacent sealers. The position where the temperature suddenly rises is the coal rock fracture position.

[0028] Further, a plurality of sealers are arranged along the axial direction of the borehole, and the position of the fracturing rod remains unchanged during the entire method process;

[0029] In step 3, the third electromagnetic stop valve on the water injection branch pipe corresponding to the two adjacent hole sealers is opened;

[0030] In step 4, the fourth electromagnetic stop valve on the corresponding fracturing water injection branch pipe between two adjacent hole sealers is opened.

[0031] Furthermore, it also includes step 7, stopping the high-pressure water supply end from injecting high-pressure water into adjacent hole sealers, opening the sixth electromagnetic stop valve, releasing the high-pressure water between adjacent hole sealers through the water outlet pipe, closing the second electromagnetic stop valve, opening the first electromagnetic stop valve, and releasing the high-pressure water in the adjacent hole sealers through the water outlet pipe.

[0032] The beneficial technical effects of the present invention are:

[0033] The invention discloses a remote control device and method for hydraulic fracturing of coal and rock mass in underground coal mines. The host computer realizes communication control with the control unit via a communication base station. The control unit controls the first electromagnetic stop valve to open, and opens the third electromagnetic stop valve on the water injection branch pipe corresponding to two adjacent hole sealers, injects high-pressure water into the two adjacent hole sealers to make the hole sealers expand and fit the inner wall of the borehole. After the first pressure gauge monitors and reaches the set pressure value, the first electromagnetic stop valve is closed, and the pressure value is monitored by the first pressure gauge and uploaded to the control unit in real time; the control unit controls the second electromagnetic stop valve to open, and opens the fourth electromagnetic stop valve on the fracturing water injection branch pipe corresponding to the two adjacent hole sealers, injects high-pressure water into the space between the adjacent hole sealers, and the pressure value is monitored by the second pressure gauge and uploaded to the control unit in real time, and the flow meter monitors the flow value and uploads it to the control unit in real time; in the above process, if the pressure value of the first pressure gauge is within the set range, the control unit records the time t0 corresponding to the instantaneous increase of the flow value after it decreases to zero, and the pressure value monitored by the second pressure gauge corresponding to the time t0 is the ground stress; the temperature at different positions of the borehole between the adjacent hole sealers is measured by the temperature measuring optical fiber to accurately determine the coal and rock mass fracture position. The above process realizes the remote control construction of hydraulic fracturing technology. There is no need for construction technicians to work in the tunnel for a long time. It is practical and operational, greatly reduces the complexity of construction, has low construction costs, high construction efficiency, high construction safety, and can accurately obtain ground stress and coal rock fracture locations, providing accurate data support for subsequent mining and construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 Schematic diagram of the structure of a remote control device for hydraulic fracturing of coal and rock mass in an underground coal mine according to an embodiment of the present invention;

[0035] Figure 2 It is a schematic diagram of the structure of the fracturing rod, the hole sealer and other components in an embodiment of the present invention;

[0036] Figure 3 A schematic diagram of communication arrangement according to an embodiment of the present invention;

[0037] Figure 4 This is a graph showing changes in pressure values ​​monitored by the second pressure gauge of the embodiment of the present invention over time;

[0038] Figure 5 This is a graph showing the change of flow value monitored by the flow meter over time according to an embodiment of the present invention. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical scheme and beneficial effects of the present invention more clearly understood, the present invention is further described in detail below in combination with specific embodiments and with reference to the accompanying drawings. Certain embodiments of the present invention will be described more comprehensively with reference to the accompanying drawings, in which some but not all embodiments will be shown. In fact, the various embodiments of the present invention can be implemented in many different forms and should not be construed as being limited to the embodiments described herein; rather, these embodiments are provided so that the present invention meets applicable legal requirements.

[0040] In the description of the present invention, it should be noted that the terms "inside", "outside", "upper", "lower", "front", "back" and the like indicate directions or positional relationships based on directions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0041] In an embodiment of the present invention, a remote control device for hydraulic fracturing of coal and rock mass in a coal mine is provided. Figures 1 to 5 shown.

[0042] A remote control device for hydraulic fracturing of coal and rock mass in underground coal mines comprises a fracturing rod 1, a sealer 2, a sealer water injection pipe 31, a fracturing water injection pipe 32, a high-pressure water supply end, a control unit 4, a communication base station and a host computer.

[0043] A plurality of sealers 2 are arranged on the fracturing rod 1. The sealers 2 are sac-shaped structures made of soft materials. Adjacent sealers 2 are spaced at a set distance.

[0044] The sealer water injection pipe 31 is connected to a plurality of sealer water injection branches 311, the number of which is equal to the number of sealers 2, and each sealer water injection branch 311 is connected to one sealer 2. High-pressure water is injected from the sealer water injection pipe 31 and enters the sealer 2 through the sealer water injection branch 311, so that the sealer 2 expands and fits the inner wall of the borehole. The adjacent sealers 22 expand and fit the inner wall of the borehole, so as to form a closed space between the adjacent sealers 2 and the inner wall of the borehole.

[0045] The fracturing water injection pipe 32 is connected to a plurality of fracturing water injection branches 321, and the end of each fracturing water injection branch 321 is located between adjacent hole sealers 2. High-pressure water is injected from the fracturing water injection pipe 32, and enters the adjacent hole sealers 2 and the inner wall of the borehole through the fracturing water injection branch 321 to form a closed space.

[0046] The input end of the hole sealer water injection pipe 31 is provided with a first electromagnetic stop valve 511 and a first pressure gauge 521. The first electromagnetic stop valve 511 is used to conduct or cut off the hole sealer water injection pipe 31, and the first pressure gauge 521 is used to monitor the pressure of high-pressure water in the hole sealer water injection pipe 31. The input end of the fracturing water injection pipe 32 is provided with a second electromagnetic stop valve 512 and a second pressure gauge 522. The second electromagnetic stop valve 512 is used to conduct or cut off the fracturing water injection pipe 32, and the second pressure gauge 522 is used to monitor the pressure of high-pressure water in the fracturing water injection pipe 32.

[0047] The sealing device water injection pipe 31 and the fracturing water injection pipe 32 are connected to one end of the water injection pipe 33 through a tee, and the other end of the water injection pipe 33 is connected to the high-pressure water supply end.

[0048] A flow meter 53 is provided on the water injection pipe 33 , and is used to monitor the high-pressure water flow rate flowing through the water injection pipe 33 , in conjunction with the first electromagnetic stop valve 511 being closed and the second electromagnetic stop valve 512 being opened, so as to monitor the high-pressure water flow rate flowing through the fracturing water injection pipe 32 .

[0049] The control unit 4 is connected to the first electromagnetic stop valve 511, the first pressure gauge 521, the second electromagnetic stop valve 512, the second pressure gauge 522 and the flow meter 53. The control unit 4 reads the data uploaded by the first pressure gauge 521, the second pressure gauge 522 and the flow meter 53 in real time, and controls the opening and closing of the first electromagnetic stop valve 511 and the second electromagnetic stop valve 512.

[0050] The control unit 4 is connected to the host computer via the mine-used communication base station to achieve communication between the control unit 4 and the host computer.

[0051] A third electromagnetic stop valve 513 is provided on each hole sealer water injection branch pipe 311, and the third electromagnetic stop valve 513 is used to conduct or cut off the hole sealer water injection branch pipe 311. A fourth electromagnetic stop valve 514 is provided on each fracturing water injection branch pipe 321, and the fourth electromagnetic stop valve 514 is used to conduct or cut off the fracturing water injection branch pipe 321.

[0052] The control unit 4 signals connect the third electromagnetic stop valve 513 and the fourth electromagnetic stop valve 514. The control unit 4 controls the opening and closing of the third electromagnetic stop valve 513 to connect or cut off the sealer water injection branch 311. The control unit 4 controls the opening and closing of the fourth electromagnetic stop valve 514 to connect or cut off the fracturing water injection branch 321.

[0053] The high-pressure water supply end includes a pressurizer, a pump station and a high-pressure air duct. The water inlet end 61 of the pressurizer is connected to the pump station, the water outlet end 62 of the pressurizer is connected to the other end of the water injection pipe 33, and the air inlet end 63 of the pressurizer is connected to the high-pressure air duct. The pressurizer increases the water pressure of the high-pressure water delivered to the water injection pipe 33 through the high-pressure air delivered by the high-pressure air duct.

[0054] The control unit 4 is connected to the pump station control terminal to control the opening and closing of the pump station.

[0055] The high-pressure air duct is provided with a third pressure gauge 523, and the control unit 4 is signal-connected to the third pressure gauge 523. The control unit 4 reads the data uploaded by the third pressure gauge 523 in real time to monitor whether the wind pressure of the high-pressure air is stable.

[0056] The high-pressure air duct is provided with a fifth electromagnetic stop valve, and the control unit 4 is connected to the fifth electromagnetic stop valve by a signal. The control unit 4 controls the opening and closing of the fifth electromagnetic stop valve to conduct or cut off the high-pressure air duct.

[0057] The water outlet pipe 34 is connected to the water injection main pipe 33 , and a sixth electromagnetic stop valve is arranged on the water outlet pipe 34 . The control unit 4 is connected to the sixth electromagnetic stop valve by a signal. The control unit 4 controls the opening and closing of the sixth electromagnetic stop valve to conduct or cut off the water outlet pipe 34 .

[0058] The temperature measuring optical fiber 7 is located between adjacent hole sealers 2, and is arranged along the axial direction of the fracturing rod 1. The control unit 4 is connected to the temperature measuring optical fiber 7. After hydraulic fracturing of the coal rock mass, the temperature at different positions of the borehole between adjacent hole sealers 2 is measured by the temperature measuring optical fiber 7, and the position where the temperature suddenly rises is the coal rock mass fracture position.

[0059] A method for remotely controlling hydraulic fracturing of coal and rock mass in a coal mine, using the above-mentioned remote control device for hydraulic fracturing of coal and rock mass in a coal mine, comprises the following steps:

[0060] Step 1: Use a drilling rig to drill a hole 8 into the surrounding coal rock mass.

[0061] Step 2: Insert the fracturing rod 1 and its components into the borehole 8.

[0062] Step 3, open the first electromagnetic stop valve 511, and inject high-pressure water from the high-pressure water supply end through the hole sealer water injection pipe 31 into the two adjacent hole sealers 2 in turn to make the hole sealers 2 expand and fit the inner wall of the borehole 8. After the first pressure gauge 521 monitors that the set pressure value is reached, close the first electromagnetic stop valve 511, and the first pressure gauge 521 monitors the pressure value and uploads it to the control unit 4 in real time.

[0063] Step 4, open the second electromagnetic stop valve 512, and inject high-pressure water from the high-pressure water supply end through the fracturing water injection pipe 32 into the adjacent hole sealers (a closed space is formed between adjacent hole sealers 2 and the inner wall of the borehole), and the second pressure gauge 522 monitors the pressure value and uploads it to the control unit 4 in real time, and the flow meter 53 monitors the flow value and uploads it to the control unit 4 in real time.

[0064] Step 5, the control unit 4 determines whether the pressure value of the first pressure gauge 521 is within the set range (8-12MPa) during step 4; whether the pressure value of the first pressure gauge 521 is within the set range (8-12MPa), it can ensure that high-pressure water will not leak too much water from between the sealer 2 and the inner wall of the borehole 8 during the hydraulic fracturing between adjacent sealers (a closed space is formed between adjacent sealers 2 and the inner wall of the borehole) in step 4, so as to improve the monitoring accuracy.

[0065] If the pressure value of the first pressure gauge 521 is not within the set range (8-12MPa), repeat steps 3 and 4; if the pressure value of the first pressure gauge 521 is within the set range (8-12MPa), the control unit 4 records the time t0 corresponding to the flow value dropping to zero and then rising instantaneously, and the pressure value monitored by the second pressure gauge 522 corresponding to time t0 is the magnitude of the ground stress.

[0066] Step 6: Use the temperature measuring optical fiber 7 to measure the temperature at different positions of the borehole 8 between adjacent sealers 2. The position where the temperature suddenly rises is the coal rock fracture position. During the coal rock fracture process, the expansion of the cracks causes friction between rock particles, and the frictional heat increases the temperature of the fracture position.

[0067] Among them, multiple sealers 2 are arranged along the axial direction of the borehole 8, and the position of the fracturing rod 1 remains unchanged during the whole method process; in step 3, the third electromagnetic stop valve 513 on the water injection branch 311 corresponding to the two adjacent sealers 2 is opened; in step 4, the fourth electromagnetic stop valve 514 on the fracturing water injection branch 321 corresponding to the two adjacent sealers 2 is opened. In this way, during the whole method process, after the construction technician places the fracturing rod 1 in the borehole 8 at the initial time, the construction technician does not need to move the fracturing rod 1 in the subsequent process to switch different fracturing areas in the borehole 8. It is only necessary to open the third electromagnetic stop valve 513 on the water injection branch 311 corresponding to the two adjacent sealers 2 at the fracturing area position and the fourth electromagnetic stop valve 514 on the fracturing water injection branch 321 corresponding to the two adjacent sealers 2. In this way, the remote control of the "switching different fracturing areas in the borehole 8" operation is realized.

[0068] Step 7, stop the high-pressure water supply end from injecting high-pressure water between adjacent hole sealers 2, open the sixth electromagnetic stop valve, release the high-pressure water between adjacent hole sealers 2 through the water outlet pipe 34, close the second electromagnetic stop valve 512, open the first electromagnetic stop valve 511, and release the high-pressure water in the adjacent hole sealers 2 through the water outlet pipe 34.

[0069] So far, the present embodiment has been described in detail in conjunction with the accompanying drawings. Based on the above description, those skilled in the art should have a clear understanding of the remote control device and method for hydraulic fracturing of coal and rock masses in coal mines underground of the present invention. The remote control device and method for hydraulic fracturing of coal and rock masses in coal mines underground of the present invention are implemented by the host computer through the communication base station to realize communication control with the control unit 4. The control unit 4 controls the first electromagnetic stop valve 511 to open, and opens the third electromagnetic stop valve 513 on the water injection branch pipe 311 corresponding to the two adjacent sealers 2, and injects high-pressure water into the two adjacent sealers 2 to make the sealers 2 expand and fit the inner wall of the borehole 8. After the first pressure gauge 521 monitors that the set pressure value has been reached, the first electromagnetic stop valve 511 is closed, and the pressure value is monitored by the first pressure gauge 521 and uploaded to the control unit 4 in real time; the control unit 4 controls the second electromagnetic stop valve 512 to open, and opens the two adjacent sealers 2. The fourth electromagnetic stop valve 514 on the fracturing water injection branch pipe 321 corresponding to the sealing device 2 injects high-pressure water between the adjacent sealing devices 2, and the second pressure gauge 522 monitors the pressure value and uploads it to the control unit 4 in real time, and the flow meter 53 monitors the flow value and uploads it to the control unit 4 in real time; in the above process, if the pressure value of the first pressure gauge 521 is within the set range, the control unit 4 records the time t0 corresponding to the flow value decreasing to zero and then increasing instantaneously, and the pressure value monitored by the second pressure gauge 522 corresponding to time t0 is the ground stress; the temperature measuring optical fiber 7 measures the temperature at different positions of the borehole 8 between the adjacent sealing devices 2 to accurately determine the fracture position of the coal rock mass. The above process realizes the remote control construction of hydraulic fracturing technology, does not require construction technicians to work in the tunnel for a long time, has strong practicality and operability, greatly reduces the complexity of construction, has low construction cost, high construction efficiency, high construction safety, and can accurately obtain the ground stress and the fracture position of the coal rock mass, so as to provide accurate data support for subsequent mining and excavation construction.

[0070] Of course, the specific embodiments described above further illustrate the purpose, technical solutions and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, 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 remote control device for hydraulic fracturing of coal and rock mass in underground coal mines, characterized by: It includes a fracturing rod, a hole sealer, a hole sealer water injection pipe, a fracturing water injection pipe, a high-pressure water supply end, a control unit, a communication base station and a host computer; At least two hole sealers are arranged on the fracturing rod, and adjacent hole sealers are spaced at a set distance; The hole sealer water injection pipe is connected to a plurality of hole sealer water injection branches, each of which is connected to a hole sealer; The fracturing water injection pipe is connected to a plurality of fracturing water injection branch pipes, and the end of each fracturing water injection branch pipe is located between adjacent hole sealers; The input end of the hole sealer water injection pipe is provided with a first electromagnetic stop valve and a first pressure gauge, and the input end of the fracturing water injection pipe is provided with a second electromagnetic stop valve and a second pressure gauge; The sealing device water injection pipe and the fracturing water injection pipe are connected to one end of the water injection pipe via a tee, and the other end of the water injection pipe is connected to the high-pressure water supply end; A flow meter is provided on the water injection main pipe; The control unit is signal-connected to the first electromagnetic stop valve, the first pressure gauge, the second electromagnetic stop valve, the second pressure gauge and the flow meter; The control unit is connected to the host computer via a communication base station.

2. The remote control device for hydraulic fracturing of coal and rock mass in underground coal mines according to claim 1, characterized in that: A third electromagnetic stop valve is arranged on each hole sealer water injection branch pipe, and a fourth electromagnetic stop valve is arranged on each fracturing water injection branch pipe. The control unit signal connects the third electromagnetic stop valve and the fourth electromagnetic stop valve.

3. A remote control device for hydraulic fracturing of coal and rock mass in a coal mine according to claim 1 or 2, characterized in that: The high-pressure water supply end includes a pressurizer, a pump station and a high-pressure air duct. The water inlet end of the pressurizer is connected to the pump station, the water outlet end of the pressurizer is connected to the other end of the water injection pipe, the air inlet end of the pressurizer is connected to the high-pressure air duct, and the control unit signal is connected to the pump station control end.

4. A remote control device for hydraulic fracturing of coal and rock mass in underground coal mines according to claim 3, characterized in that: The high-pressure air duct is provided with a third pressure gauge, and the control unit signal is connected to the third pressure gauge.

5. The remote control device for hydraulic fracturing of coal and rock mass in underground coal mines according to claim 3, characterized in that: The high-pressure air duct is provided with a fifth electromagnetic stop valve, and the control unit signal is connected to the fifth electromagnetic stop valve.

6. The remote control device for hydraulic fracturing of coal and rock mass in underground coal mines according to claim 1, characterized in that: It also includes a water outlet pipe, which is connected to the water injection main pipe. A sixth electromagnetic stop valve is arranged on the water outlet pipe, and the control unit signal is connected to the sixth electromagnetic stop valve.

7. The remote control device for hydraulic fracturing of coal and rock mass in underground coal mines according to claim 1, characterized in that: It also includes a temperature measuring optical fiber, which is located between adjacent hole sealers and arranged along the axial direction of the fracturing rod. The control unit signal is connected to the temperature measuring optical fiber.

8. A method for remote control of hydraulic fracturing of coal and rock mass in a coal mine, using the remote control device for hydraulic fracturing of coal and rock mass in a coal mine as claimed in any one of claims 1 to 7, characterized in that: The steps include: Step 1: Drilling holes into the surrounding coal rock mass using a drilling rig; Step 2: Insert the fracturing rod into the borehole; Step 3, open the first electromagnetic stop valve, and inject high-pressure water from the high-pressure water supply end through the hole sealer water injection pipe into the two adjacent hole sealers in sequence to make the hole sealers expand and fit the inner wall of the borehole. After the first pressure gauge monitors that the set pressure value is reached, close the first electromagnetic stop valve, and the first pressure gauge monitors the pressure value and uploads it to the control unit in real time; Step 4, open the second electromagnetic stop valve, and inject high-pressure water from the high-pressure water supply end into the adjacent hole sealers through the fracturing water injection pipe in sequence, and monitor the pressure value by the second pressure gauge and upload it to the control unit in real time, and monitor the flow value by the flow meter and upload it to the control unit in real time; Step 5, the control unit determines whether the pressure value of the first pressure gauge is within the set range during step 4; if the pressure value of the first pressure gauge is not within the set range, repeat steps 3 and 4; if the pressure value of the first pressure gauge is within the set range, the control unit records the time t0 corresponding to the flow value decreasing to zero and then increasing instantaneously, and the pressure value monitored by the second pressure gauge corresponding to time t0 is the ground stress; Step 6: Use the temperature measuring optical fiber to measure the temperature at different positions of the borehole between adjacent sealers. The position where the temperature suddenly rises is the coal rock fracture position.

9. A remote control method for hydraulic fracturing of coal and rock mass in a coal mine according to claim 8, characterized in that: A plurality of sealers are arranged along the axial direction of the borehole, and the position of the fracturing rod remains unchanged during the whole method process; In step 3, the third electromagnetic stop valve on the water injection branch pipe corresponding to the two adjacent hole sealers is opened; In step 4, the fourth electromagnetic stop valve on the corresponding fracturing water injection branch pipe between two adjacent hole sealers is opened.

10. A remote control method for hydraulic fracturing of coal and rock mass in a coal mine according to claim 8, characterized in that: The method also includes step 7, stopping the high-pressure water supply end from injecting high-pressure water into adjacent hole sealers, opening the sixth electromagnetic stop valve, releasing the high-pressure water between adjacent hole sealers through the water outlet pipe, closing the second electromagnetic stop valve, opening the first electromagnetic stop valve, and releasing the high-pressure water in the adjacent hole sealers through the water outlet pipe.

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