Blowout prevention and monitoring system for drill hole

Abstract

The invention discloses a drilling blowout prevention and monitoring system which comprises a drilling mechanism, a blowout prevention sealing assembly, a gas-water separation tank, a current collector, an extraction pipe and a monitoring system, and relates to the technical field of coal mine construction protection. By integrating the blowout prevention sealing assembly and the intelligent methane concentration monitoring system, leakage of harmful gas such as methane is effectively prevented in the drilling operation, especially when the methane concentration reaches a dangerous threshold value, the system can automatically start the blowout prevention sealing device, a gas leakage channel is rapidly sealed through sealing measures, and the safety of the drilling operation is improved. Potential safety hazards possibly caused by manual operation delay are avoided, so that the system greatly improves safety in the drilling operation process and is particularly suitable for mines and other environments with high poisonous and harmful gas risk, the operation response speed and precision are remarkably improved through intelligent control, and especially when emergencies happen, the safety of the system is greatly improved. Measures can be taken quickly, and accidents are effectively prevented.

Description

Technical Field

[0001] The invention relates to the technical field of coal mine construction protection, in particular to a drilling blowout prevention and monitoring system. Background Art

[0002] Drilling operations, especially those in special environments such as mines and oil and gas fields, are high-risk industrial activities. In these operations, harmful gases such as gas and methane may be encountered during the drilling process. Once a gas leak or explosion occurs, it may pose a great threat to the life safety of the operators and the environment. Therefore, ensuring the safety and real-time monitoring of gas leakage during the drilling process is a very important technical requirement.

[0003] In existing drilling equipment, gas leakage is usually prevented by mechanical structures and simple sealing devices. However, these protective measures mostly remain at the level of mechanical sealing protection, and fail to comprehensively consider the monitoring and control of gas leakage, especially the real-time detection and emergency response mechanism for toxic and harmful gases such as methane. They rely on relatively simple alarm systems or manual intervention, and are difficult to meet the safety needs of high-risk operating environments such as modern mines or oil and gas fields.

[0004] To this end, the present invention provides a drilling blowout prevention and monitoring system to solve the above problems. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a drilling blowout prevention and monitoring system to solve the above problems.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0007] A drilling blowout prevention and monitoring system, comprising:

[0008] The drilling mechanism comprises a four-way pipe, a drill rod is rotatably installed in the four-way pipe, one end of the drill rod is fixedly connected to the output end of the external drive motor, a drill bit is fixed to the other end of the drill rod, the top walls of the left and right ends of the four-way pipe are fixedly connected to air guide pipes, a ball valve is installed on the air guide pipe, gate valves are installed at the pipe openings at the upper and lower ends of the four-way pipe, an orifice blowout prevention sleeve is fixed to the left end of the four-way pipe, and fixed bolt rings are symmetrically fixed to the side walls of the four-way pipe;

[0009] A blowout-proof sealing assembly, wherein the blowout-proof sealing assembly is fixed to the right end of the four-way pipe, and a packing box is fixed to the right end of the blowout-proof sealing assembly;

[0010] An air-water separation box, the feed pipe of which is connected to the lower port of the four-way pipe through a high-pressure extraction pipe;

[0011] A current collector, wherein the interface at the bottom of the current collector is connected to the gas outlet pipe on the top wall of the gas-water separation box through a high-pressure extraction pipe;

[0012] The extraction pipe, the interface on the left side of the bottom of the extraction pipe is connected to the upper port of the four-way pipe through the extraction high-pressure pipe, and the interface on the right side of the bottom of the extraction pipe is connected to the outlet pipe on the top of the collector through the extraction high-pressure pipe;

[0013] A monitoring system is provided, wherein the monitoring system is used to monitor the concentration of methane during the drilling process of the drilling mechanism, and to control the working state of the drilling mechanism and the blowout prevention sealing component according to the concentration of methane.

[0014] Preferably, the anti-blowout seal assembly comprises a mounting tube, both ends of which are fixed with mounting flanges, and an air guide ring tube is sleeved on the outer side of the mounting tube;

[0015] The outer wall of the air guide ring tube is fixedly connected with an air intake pipe, and the inner wall of the air guide ring tube is symmetrically fixed with a connecting pipe;

[0016] A sealing bag is symmetrically installed on the inner wall of the installation tube, and the sealing bag is connected with the connecting tube.

[0017] Preferably, the monitoring system includes a monitoring substation, and the monitoring substation is electrically connected to a mine flameproof and intrinsically safe DC power supply, an emergency stop manual power-off controller, a mine environment laser methane sensor, a mine pipeline laser methane sensor, an intrinsically safe electromagnetic control valve and an intrinsically safe power-off control device;

[0018] The mine flameproof and intrinsically safe DC power supply is electrically connected to a comprehensive protection switch;

[0019] The emergency stop manual power-off controller is electrically connected to the mining flameproof and intrinsically safe DC power supply;

[0020] The intrinsically safe power-off control device is electrically connected to an intrinsically safe power-off controller.

[0021] Preferably, the model of the monitoring substation is KJ1042-F, the model of the mining explosion-proof and intrinsically safe DC power supply is KDY600 / 24B, and the model of the mining pipeline laser methane sensor is GJJ100G.

[0022] Preferably, the power interface of the monitoring substation is electrically connected to port No. 5 of the mine-use flameproof and intrinsically safe DC power supply, the emergency stop manual power-off controller is connected in series between port No. 1 of the monitoring substation and port No. 4 of the mine-use flameproof and intrinsically safe DC power supply, and the output end of the comprehensive protection switch is electrically connected to port No. 3 of the mine-use flameproof and intrinsically safe DC power supply.

[0023] Preferably, the signal output end of the mining environment laser methane sensor is electrically connected to port No. 6 of the monitoring substation, and the detection interface at the bottom of the mining environment laser methane sensor is connected to the gas duct on the right side of the four-way pipe through the gas extraction pipe.

[0024] Preferably, the signal output end of the mining pipeline laser methane sensor is electrically connected to port No. 8 of the monitoring substation, and the detection interface at the bottom of the mining pipeline laser methane sensor is connected to the gas guide pipe on the left side of the four-way pipe and the extraction high-pressure pipe between the collector and the extraction pipe through the gas extraction pipe.

[0025] Preferably, a drying box is installed on the gas extraction pipe connecting the mining pipeline laser methane sensor and the air duct on the left side of the four-way pipe.

[0026] Preferably, the signal output end of the intrinsically safe electromagnetic control valve is electrically connected to port No. 6 of the monitoring substation, the air inlet of the intrinsically safe electromagnetic control valve is connected to an external high-pressure device, and the air outlet of the intrinsically safe electromagnetic control valve is connected to the air inlet pipe through a high-pressure pipeline.

[0027] Preferably, port 2 of the intrinsically safe power-off control device is electrically connected to port 7 of the monitoring substation, and ports 3 and 4 of the intrinsically safe power-off control device are electrically connected to the signal input terminal and signal output terminal of the intrinsically safe power-off controller, respectively.

[0028] Beneficial Effects

[0029] The present invention provides a drilling blowout prevention and monitoring system. Compared with the prior art, it has the following beneficial effects:

[0030] (1) The drilling blowout prevention and monitoring system of the present invention effectively prevents the leakage of harmful gases such as methane during drilling operations by integrating the blowout prevention sealing component and the intelligent methane concentration monitoring system. In particular, when the methane concentration reaches the dangerous threshold, the system can automatically start the blowout prevention sealing device and quickly close the gas leakage channel through sealing measures, avoiding the potential safety hazards caused by manual operation delays. Therefore, the system greatly improves the safety of the drilling operation process, and is particularly suitable for mines and other environments with high risks of toxic and harmful gases.

[0031] (2) The present invention uses an intelligent monitoring system and an automated control device to monitor methane concentration in real time and respond promptly. When the methane concentration is detected to be excessive, the system automatically activates the blowout prevention seal assembly for sealing, completely eliminating the shortcomings of traditional drilling operations that rely on manual judgment and intervention. This intelligent control significantly improves the response speed and accuracy of the operation, especially when an emergency occurs, measures can be taken quickly to effectively prevent accidents.

[0032] (3) The drilling blowout prevention and monitoring system of the present invention adopts an integrated design, integrating multiple functional modules such as the blowout prevention seal assembly, methane monitoring device, and gas-water separation device, thereby simplifying the structure and operation process of the system. The integrated design not only reduces the complexity and maintenance cost of the equipment, but also improves the stability and reliability of the system. In addition, the integrated design improves the overall operating efficiency of the equipment, reduces conflicts or redundancies between various parts of the system, and improves the overall efficiency of the drilling operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a three-dimensional diagram of the external structure of the present invention;

[0034] Figure 2 It is a three-dimensional diagram of the external structure of the drilling mechanism of the present invention;

[0035] Figure 3 It is a three-dimensional diagram of the structure of the anti-spray seal assembly of the present invention;

[0036] Figure 4 is a half-section stereoscopic view of a blowout prevention seal assembly of the present invention;

[0037] Figure 5 It is a schematic diagram of the connection structure between the blowout prevention sealing assembly and the intrinsically safe electromagnetic control valve of the present invention;

[0038] Figure 6 It is a stereoscopic diagram of the monitoring system structure of the present invention;

[0039] Figure 7 It is a circuit block diagram of the monitoring system of the present invention.

[0040] In the figure, 1, four-way pipe; 2, drill rod; 3, drill bit; 4, air guide pipe; 5, ball valve; 6, gate valve; 7, blowout prevention seal assembly; 71, mounting pipe; 72, mounting flange; 73, air guide ring pipe; 74, air intake pipe; 75, connecting pipe; 76, sealing bag; 8, packing box; 9, fixing bolt ring; 10, monitoring substation; 11, mine flameproof and intrinsically safe DC power supply; 12, emergency stop manual power-off controller; 13, comprehensive protection switch; 14, mine environment laser methane sensor; 15, mine pipeline laser methane sensor; 16, intrinsically safe electromagnetic control valve; 17, intrinsically safe power-off control device; 18, intrinsically safe power-off controller; 19, gas-water separation box; 20, collector; 21, extraction pipe; 22, extraction high-pressure pipe; 23, orifice blowout prevention casing. DETAILED DESCRIPTION

[0041] 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.

[0042] Embodiment 1:

[0043] See also Figure 1-2 , a drilling blowout prevention and monitoring system, comprising:

[0044] The drilling mechanism includes a four-way pipe 1, a drill rod 2 is rotatably installed in the four-way pipe 1, one end of the drill rod 2 is fixedly connected to the output end of the external drive motor, and a drill bit 3 is fixed to the other end of the drill rod 2. The top walls of the left and right ends of the four-way pipe 1 are fixedly connected with air guide pipes 4, and the air guide pipes 4 are equipped with ball valves 5. The pipe openings of the upper and lower ends of the four-way pipe 1 are equipped with gate valves 6. The left end of the four-way pipe 1 is fixed with an orifice blowout prevention sleeve 23, and the side walls of the four-way pipe 1 are symmetrically fixed with fixed bolt rings 9;

[0045] The blowout-proof sealing assembly 7 is fixed to the right end of the cross-tube 1, and a packing box 8 is fixed to the right end of the blowout-proof sealing assembly 7;

[0046] An air-water separation box 19, the feed pipe of which is connected to the lower port of the cross-tube 1 through a high-pressure extraction pipe 22;

[0047] The current collector 20, the interface at the bottom of the current collector 20 is connected to the gas outlet pipe on the top wall of the gas-water separation box 19 through the extraction high-pressure pipe 22;

[0048] The extraction pipe 21, the interface on the left side of the bottom of the extraction pipe 21 is connected to the upper port of the four-way pipe 1 through the extraction high-pressure pipe 22, and the interface on the right side of the bottom of the extraction pipe 21 is connected to the outlet pipe at the top of the collector 20 through the extraction high-pressure pipe 22;

[0049] The monitoring system is used to monitor the concentration of methane during the drilling process of the drilling mechanism, and control the working status of the drilling mechanism and the blowout prevention sealing component 7 according to the concentration of methane.

[0050] In this embodiment, the drilling mechanism is used for drilling operation. Before the drilling operation, the drilling azimuth and inclination are determined by using a mining intrinsically safe drilling rig hole orientation instrument. The drill rod 2 is used in conjunction with the drill bit 3 for drilling. The orifice blowout prevention casing 23 is used to insert and fix the four-way pipe 1 at the orifice position, while sealing the gas in the hole. The fixed bolt ring 9 is used in conjunction with the pull rope to further fix the drilling mechanism. The blowout prevention sealing assembly 7 is used to cooperate with the monitoring system to achieve intelligent clamping and sealing of the drilling mechanism. The gas-water separation box 19 is connected to the four-way pipe 1, which can separate the gas from the water and slag. Methane is pumped to the collector 20 through the top outlet pipe, and the water slag is discharged through the slag outlet pipe on the right.

[0051] Embodiment 2:

[0052] See also Figure 3-7 This embodiment provides a technical solution based on the first embodiment:

[0053] The anti-blowout seal assembly 7 includes a mounting tube 71, mounting flanges 72 are fixed at both ends of the mounting tube 71, and an air guide ring tube 73 is sleeved on the outer side of the mounting tube 71;

[0054] The outer wall of the air guide ring tube 73 is fixedly connected with an air inlet pipe 74, and the inner wall of the air guide ring tube 73 is symmetrically fixed with a connecting pipe 75;

[0055] A sealing bag 76 is symmetrically mounted on the inner wall of the mounting tube 71 , and the sealing bag 76 is connected to the connecting tube 75 .

[0056] The monitoring system includes a monitoring substation 10, which is electrically connected to a mine flameproof and intrinsically safe DC power supply 11, an emergency stop manual power-off controller 12, a mine environment laser methane sensor 14, a mine pipeline laser methane sensor 15, an intrinsically safe electromagnetic control valve 16 and an intrinsically safe power-off control device 17;

[0057] The mine flameproof and intrinsically safe DC power supply 11 is electrically connected to a comprehensive protection switch 13;

[0058] The emergency stop manual power off controller 12 is electrically connected to the mine flameproof and intrinsically safe DC power supply 11;

[0059] The intrinsically safe power-off control device 17 is electrically connected to an intrinsically safe power-off controller 18 .

[0060] The model of the monitoring substation 10 is KJ1042-F, the model of the mine-use flameproof and intrinsically safe DC power supply 11 is KDY600 / 24B, and the model of the mine-use pipeline laser methane sensor 15 is GJJ100G.

[0061] The power interface of the monitoring substation 10 is electrically connected to port No. 5 of the mine-used flameproof and intrinsically safe DC power supply 11, the emergency stop manual power-off controller 12 is connected in series between port No. 1 of the monitoring substation 10 and port No. 4 of the mine-used flameproof and intrinsically safe DC power supply 11, and the output end of the comprehensive protection switch 13 is electrically connected to port No. 3 of the mine-used flameproof and intrinsically safe DC power supply 11.

[0062] The signal output end of the mine environment laser methane sensor 14 is electrically connected to port 6 of the monitoring substation 10, and the detection interface at the bottom of the mine environment laser methane sensor 14 is connected to the gas guide pipe 4 on the right side of the four-way pipe 1 through the gas extraction pipe.

[0063] The signal output end of the mine pipeline laser methane sensor 15 is electrically connected to port 8 of the monitoring substation 10, and the detection interface at the bottom of the mine pipeline laser methane sensor 15 is connected to the gas guide pipe 4 on the left side of the four-way pipe 1 and the extraction high-pressure pipe 22 between the collector 20 and the extraction pipe 21 through the gas extraction pipe.

[0064] A drying box is installed on the gas extraction pipe that connects the mining pipeline laser methane sensor 15 with the gas guide pipe 4 on the left side of the four-way pipe 1.

[0065] The signal output end of the intrinsically safe electromagnetic control valve 16 is electrically connected to port 6 of the monitoring substation 10, the air inlet of the intrinsically safe electromagnetic control valve 16 is connected to an external high-pressure device, and the air outlet of the intrinsically safe electromagnetic control valve 16 is connected to the air inlet pipe 74 through a high-pressure pipeline.

[0066] Port 2 of the intrinsically safe power-off control device 17 is electrically connected to port 7 of the monitoring substation 10 , and ports 3 and 4 of the intrinsically safe power-off control device 17 are electrically connected to the signal input terminal and signal output terminal of the intrinsically safe power-off controller 18 , respectively.

[0067] In this embodiment, the anti-blowout sealing assembly 7 is used to cooperate with the monitoring system to realize the intelligent clamping and sealing of the drilling mechanism. The mine environment laser methane sensor 14 is used to detect the methane concentration in the drilling site to prevent gas from exceeding the limit. The upper limit of methane concentration is set to 0.5%. The mine pipeline laser methane sensor 15 is connected to the air guide pipe 4 on the left side of the four-way pipe 1 to detect the gas concentration in the hole at any time. The upper limit of methane concentration is set to 1.5%. The mine flameproof and intrinsically safe DC power supply 11 is used to provide 12V DC power to the monitoring substation 10. The emergency stop manual power-off controller 12 is used to manually disconnect the power supply of the drilling rig in emergency situations such as large changes in methane concentration in the hole, spray holes, and mine environment laser methane sensor 14. The set comprehensive protection switch 13 is used to convert the input 1140V AC into 127V AC and input it into the mine flameproof and intrinsically safe DC power supply 11. The intrinsically safe electromagnetic control valve 16 can control the external high-pressure equipment to supply gas to the blowout prevention seal assembly 7 when the detected methane concentration exceeds the preset range. The gas enters the air guide ring tube 73 through the air inlet pipe 74 and then is introduced into the sealing bag 76 through the connecting pipe 75. The sealing bag 76 expands to block the gap between the drill pipe and the installation pipe 71, thereby locking the drill pipe and sealing the device. The intrinsically safe power-off control device 17 can transmit a signal to the monitoring substation 10 and the control device is powered off when a blowout occurs, the concentration of the mining environment laser methane sensor 14 reaches or exceeds 0.5%, and the concentration of the mining pipeline laser methane sensor 15 reaches or exceeds 1.5%.

[0068] Meanwhile, the contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0069] 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.

[0070] 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 drilling blowout prevention and monitoring system, characterized in that: include: A drilling mechanism, the drilling mechanism comprising a four-way pipe (1), a drill rod (2) is rotatably installed in the four-way pipe (1), one end of the drill rod (2) is fixedly connected to the output end of an external drive motor, and a drill bit (3) is fixed to the other end of the drill rod (2); the top walls of the left and right ends of the four-way pipe (1) are fixedly connected to air guide pipes (4), a ball valve (5) is installed on the air guide pipe (4), the pipe openings of the upper and lower ends of the four-way pipe (1) are installed with gate valves (6), the left end of the four-way pipe (1) is fixed with an orifice blowout prevention sleeve (23), and the side walls of the four-way pipe (1) are symmetrically fixed with fixing bolt rings (9); A blowout-proof sealing assembly (7), wherein the blowout-proof sealing assembly (7) is fixed to the right end of the four-way pipe (1), and a packing box (8) is fixed to the right end of the blowout-proof sealing assembly (7); An air-water separation box (19), wherein a feed pipe of the air-water separation box (19) is connected to a lower port of the cross-way pipe (1) via a high-pressure extraction pipe (22); A current collector (20), wherein an interface at the bottom of the current collector (20) is connected to an air outlet pipe on the top wall of the air-water separation box (19) via a high-pressure extraction pipe (22); An extraction pipe (21), wherein the interface on the left side of the bottom of the extraction pipe (21) is connected to the upper port of the four-way pipe (1) through an extraction high-pressure pipe (22), and the interface on the right side of the bottom of the extraction pipe (21) is connected to the outlet pipe at the top of the collector (20) through the extraction high-pressure pipe (22); A monitoring system is provided, wherein the monitoring system is used to monitor the concentration of methane during the drilling process of the drilling mechanism, and to control the working state of the drilling mechanism and the blowout prevention sealing component (7) according to the concentration of methane.

2. A drilling blowout prevention and monitoring system according to claim 1, characterized in that: The anti-blowout seal assembly (7) comprises a mounting tube (71), both ends of the mounting tube (71) are fixed with mounting flanges (72), and the outer side of the mounting tube (71) is sleeved with an air guide ring tube (73); The outer wall of the air guide ring tube (73) is fixedly connected to an air inlet pipe (74), and the inner wall of the air guide ring tube (73) is symmetrically fixed with a connecting pipe (75); A sealing bag (76) is symmetrically mounted on the inner wall of the mounting tube (71), and the sealing bag (76) is in communication with the connecting tube (75).

3. A drilling blowout prevention and monitoring system according to claim 2, characterized in that: The monitoring system comprises a monitoring substation (10), wherein the monitoring substation (10) is electrically connected to a mine flameproof and intrinsically safe DC power supply (11), an emergency stop manual power-off controller (12), a mine environment laser methane sensor (14), a mine pipeline laser methane sensor (15), an intrinsically safe electromagnetic control valve (16) and an intrinsically safe power-off control device (17); The mine flameproof and intrinsically safe DC power supply (11) is electrically connected to a comprehensive protection switch (13); The emergency stop manual power off controller (12) is electrically connected to the mining flameproof and intrinsically safe DC power supply (11); The intrinsically safe power-off control device (17) is electrically connected to an intrinsically safe power-off controller (18).

4. A drilling blowout prevention and monitoring system according to claim 3, characterized in that: The model of the monitoring substation (10) is KJ1042-F, the model of the mining flameproof and intrinsically safe DC power supply (11) is KDY600 / 24B, and the model of the mining pipeline laser methane sensor (15) is GJJ100G.

5. A drilling blowout prevention and monitoring system according to claim 4, characterized in that: The power interface of the monitoring substation (10) is electrically connected to port No. 5 of the mine-used flameproof and intrinsically safe DC power supply (11); the emergency stop manual power-off controller (12) is connected in series between port No. 1 of the monitoring substation (10) and port No. 4 of the mine-used flameproof and intrinsically safe DC power supply (11); and the output end of the comprehensive protection switch (13) is electrically connected to port No. 3 of the mine-used flameproof and intrinsically safe DC power supply (11).

6. A drilling blowout prevention and monitoring system according to claim 4, characterized in that: The signal output end of the mine environment laser methane sensor (14) is electrically connected to port No. 6 of the monitoring substation (10), and the detection interface at the bottom of the mine environment laser methane sensor (14) is connected to the gas guide pipe (4) on the right side of the four-way pipe (1) through a gas extraction pipe.

7. A drilling blowout prevention and monitoring system according to claim 4, characterized in that: The signal output end of the mine pipeline laser methane sensor (15) is electrically connected to port No. 8 of the monitoring substation (10), and the detection interface at the bottom of the mine pipeline laser methane sensor (15) is connected to the gas guide pipe (4) on the left side of the four-way pipe (1) and the extraction high-pressure pipe (22) between the collector (20) and the extraction pipe (21) through the gas extraction pipe.

8. A drilling blowout prevention and monitoring system according to claim 7, characterized in that: A drying box is installed on the gas extraction pipe connecting the mining pipeline laser methane sensor (15) and the air guide pipe (4) on the left side of the four-way pipe (1).

9. A drilling blowout prevention and monitoring system according to claim 4, characterized in that: The signal output end of the intrinsically safe electromagnetic control valve (16) is electrically connected to port No. 6 of the monitoring substation (10), the air inlet of the intrinsically safe electromagnetic control valve (16) is connected to an external high-pressure device, and the air outlet of the intrinsically safe electromagnetic control valve (16) is connected to the air inlet pipe (74) via a high-pressure pipeline.

10. A drilling blowout prevention and monitoring system according to claim 4, characterized in that: Port No. 2 of the intrinsically safe power-off control device (17) is electrically connected to port No. 7 of the monitoring substation (10), and ports No. 3 and No. 4 of the intrinsically safe power-off control device (17) are electrically connected to a signal input end and a signal output end of the intrinsically safe power-off controller (18), respectively.

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