A tunneling machine spray system and method of controlling the same

Abstract

The present disclosure relates to a tunneling machine spraying system and a method for controlling the same. The spraying system comprises: a tunnel water source located at a total water inlet of the spraying system, and a pressure sensor is arranged at the total water inlet; a first branch is branched from the tunnel water source after the pressure sensor, a high-pressure water pump is arranged in the first branch, a pressure reducing valve is arranged upstream of the high-pressure water pump in the first branch, and an overflow water path is arranged downstream of the high-pressure water pump; a second branch is parallel to the first branch, the second branch is branched from the tunnel water source after the pressure sensor, and a second one-way valve is arranged in the second branch; a third branch, the second branch merges into the third branch with the first branch downstream of the overflow water path; and a remote control center, the remote control center controls the motor of the high-pressure water pump according to the measurement values of the pressure sensor, the flow meter and the switch valve. The present disclosure can effectively increase the service life of the motor and the water pump, and reduce the energy consumption of the system.

Description

Technical Field

[0001] This disclosure relates to the field of underground equipment technology in coal mines, and more specifically, to a spray system for a tunneling machine and a method for controlling it. Background Technology

[0002] Coal mine spray systems are extremely important for preventing fires and explosions in coal mines. They dilute the concentration of flammable gases or dust in the coal mine working face and surrounding environment, lower the temperature, and inhibit combustion reactions by spraying water mist or chemical agents, thereby achieving explosion-proof and fire-proof purposes. Simultaneously, they can also be used as an auxiliary measure in coal mine ventilation systems to improve working environment conditions and ensure miners' safety.

[0003] In full-face tunneling machinery used in coal mine roadways, the commonly used spraying system requires the water pump motor to be constantly running during operation. The high-pressure water is depressurized, then repressurized by the pump before being sprayed. During this process, the motor and pump are constantly operating, resulting in shortened component lifespan and high energy consumption.

[0004] The water outlet of the tunnel pipeline is usually located 1 to 2 kilometers underground. The water at the outlet of the tunnel pipeline itself has a high pressure. However, there are many water-using devices in the mine, and the water pressure at the outlet of the tunnel pipeline will fluctuate. Traditional tunneling machine spraying systems use high-pressure water pumps to treat tunnel water of different pressures. The tunnel water under high pressure cannot be effectively utilized, and it is easy to cause the pump to shorten the life of the components. Summary of the Invention

[0005] In view of the above, this disclosure provides a tunneling machine spray system and a method for controlling it, thereby solving or at least mitigating one or more of the above-mentioned problems and other problems existing in the prior art.

[0006] To achieve the aforementioned objectives, a first aspect of this disclosure provides a tunneling machine spray system, wherein the spray system comprises:

[0007] The water source in the tunnel is located at the main inlet of the spray system, and a pressure sensor is installed at the main inlet.

[0008] The first branch is branched off from the water source in the tunnel after the pressure sensor. A high-pressure water pump is installed in the first branch. A pressure reducing valve is installed upstream of the high-pressure water pump in the first branch. An overflow water path is installed downstream of the high-pressure water pump. The overflow water path leads to the water tank through an overflow valve and a first check valve. A pressure gauge is installed at the overflow valve.

[0009] A second branch, the second branch being connected in parallel with the first branch, the second branch branching from the roadway water source after the pressure sensor, and a second one-way valve being provided in the second branch;

[0010] A third branch, the second branch converging with the first branch to the third branch downstream of the overflow water path, the third branch sequentially passing through a flowmeter, a throttle valve and a switching valve and then connecting to the nozzle assembly of the spray system; and

[0011] A remote control center, the pressure sensor, the flowmeter, the switching valve communicating with the remote control center, and the remote control center controlling the motor of the high-pressure water pump according to the measured values of the pressure sensor, the flowmeter, and the switching valve.

[0012] Optionally, in the spray system as described above, the pressure sensor is installed at the roadway water source, and the flowmeter is arranged in the third branch between the confluence point of the first branch and the second branch and the throttle valve.

[0013] Optionally, in the spray system as described above, the spray system is configured such that when the spray system is started, the remote control center sends an open command to the switching valve, and at the same time the real-time monitoring value Q1 of the flowmeter is transmitted to the remote control center and compared with the flow rate set value Q2. After determining that the nozzle assembly, the first branch and the second branch are all normal, an opening command is sent to the motor, where:

[0014] When Q1>Q2, the pressure sensor monitors the pressure P1 of the roadway water source in real time and transmits it to the remote control center, and then compares it with the pressure set value P2 of the remote control center. If P1>P2 and P1 is stable for N minutes and is greater than P2, the remote control center sends a close command to the motor. If P1<P2 and P1 is stable for M minutes and is less than P2, the remote control center sends an opening command to the motor;

[0015] When Q1<Q2, the remote control center determines that the nozzle assembly, the first branch, the second branch and the third branch are abnormal. At this time, the remote control center sends a close command to the motor, and then sends a close command to the switching valve, and the order of the remote control center sending a close command to the motor and sending a close command to the switching valve cannot be reversed.

[0016] Optionally, in the spray system as described above, M is set to 30 minutes and N is set to 30 minutes.

[0017] Optionally, in the spray system as described above, the second one-way valve enables the roadway water source to smoothly reach the nozzle assembly and prevents backflow. Moreover, the opening pressure of the second one-way valve is relatively small with respect to the pressure in the roadway water source, and the second one-way valve has an automatic reset function.

[0018] Optionally, in the spray system as described above, the switching valve is an electronic ball valve, and the electronic ball valve is located downstream of the throttle valve and upstream of the nozzle assembly.

[0019] Optionally, in the spray system as described above, the pressure reducing valve is used to reduce the water pressure of the roadway water source to a pressure range that the high-pressure water pump can withstand, and the high-pressure water pump boosts the water pressure to above the value specified by the coal mine standard.

[0020] Optionally, in the spray system as described above, the pressure range is set to be below 10 bar, and the opening pressure of the second one-way valve is set to 0.5 bar.

[0021] To achieve the foregoing objectives, the second aspect of the present disclosure provides a method for controlling a roadheader spray system as described in any one of the first aspects above.

[0022] Optionally, in the method as described above, when the spray system is started, the remote control center sends an open command to the switching valve. At the same time, the real-time monitoring value Q1 of the flowmeter is transmitted to the remote control center and compared with the flow set value Q2. After determining that the nozzle assembly, the first branch, and the second branch are all normal, an open command is sent to the motor, where:

[0023] When Q1 > Q2, the pressure sensor monitors the pressure P1 of the roadway water source in real time and transmits it to the remote control center, and then compares it with the pressure set value P2 of the remote control center. If P1 > P2 and P1 remains stable for N minutes and is greater than P2, the remote control center sends a close command to the motor. If P1 < P2 and P1 remains stable for M minutes and is less than P2, the remote control center sends an open command to the motor;

[0024] When Q1 < Q2, the remote control center determines that the nozzle assembly, the first branch, the second branch, and the third branch are abnormal. At this time, the remote control center sends a close command to the motor, and then sends a close command to the switching valve. Moreover, the order in which the remote control center sends a close command to the motor and sends a close command to the switching valve cannot be reversed.

[0025] By using the above-described technical solution of this disclosure, a first branch and a second branch are set up in parallel from the water source in the tunnel, along with a corresponding spray system control method. This allows the low-pressure water to enter the first branch and be pressurized by a high-pressure water pump to supply the nozzle assembly for spraying when the water source in the tunnel provides low-pressure water. When the water source in the tunnel provides high-pressure water, the high-pressure water directly enters the third branch from the second branch through a second one-way valve to supply the nozzle assembly for spraying. At this time, the high-pressure water pump in the first branch stops operating, preventing the high-pressure water pump from being overused and thus reducing its lifespan too quickly, effectively saving energy.

[0026] This disclosure establishes a remote control center, enabling staff to monitor the status of the tunneling machine's spray system online and to achieve online fault monitoring and remote one-button start / stop functions.

[0027] Therefore, this disclosure can effectively increase the service life of motors and water pumps, reduce system energy consumption, realize online fault monitoring of the system, and enable remote one-button start / stop function of the spray system. Attached Figure Description

[0028] The disclosure of this invention will become more apparent with reference to the accompanying drawings. It should be understood that these drawings are for illustrative purposes only and are not intended to limit the scope of this disclosure. In the drawings:

[0029] Figure 1 This is a schematic diagram of one embodiment of the tunneling machine spray system disclosed herein;

[0030] Figure 2 This is a schematic flowchart of one embodiment of the tunneling machine spray system control method disclosed herein.

[0031] Reference numerals: 1-Water source for tunnel; 2-Pressure sensor; 3-Pressure reducing valve; 4-High-pressure water pump; 5-Pressure gauge; 6-Overflow valve; 7-First check valve; 8-Water tank; 9-Second check valve; 10-Flow meter; 11-Throttle valve; 12-Switch valve; 13-Nozzle assembly. Detailed Implementation

[0032] Referring to the accompanying drawings and specific embodiments, the structure, composition, features, and advantages of the tunneling machine spray system and the method for controlling it disclosed herein will be described by way of example. However, all descriptions should not be construed as limiting the scope of this disclosure.

[0033] Furthermore, for any single technical feature described or implied in the embodiments mentioned herein, or any single technical feature shown or implied in the various drawings, this disclosure still allows for any combination or deletion of these technical features (or their equivalents) without any technical obstacle, and thus these further embodiments according to this disclosure should also be considered within the scope of this description.

[0034] It should also be noted that the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first," "second," or "third" may explicitly or implicitly include at least one of those features.

[0035] It should also be noted that the terms "upstream," "downstream," etc., indicate the positional relationship based on the positional relationship in the hydraulic flow path of the tunneling machine spray system shown in the accompanying drawings. They are only for the convenience of describing this disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, or be constructed and operated in a specific position. Therefore, they should not be construed as limitations on this disclosure.

[0036] Figure 1 This is a schematic diagram of one embodiment of the tunneling machine spray system disclosed herein.

[0037] like Figure 1 As shown, the tunneling machine spray system in this embodiment may include a tunnel water source 1, a first branch, a second branch, a third branch, and a remote control center.

[0038] In this illustrated embodiment, the water source 1 is located at the main inlet of the spray system, and a pressure sensor 2 is installed at the main inlet to monitor the water pressure value of the water source 1 and transmit it to the control center.

[0039] The tunnel water source 1 is usually located or connected to a depth of one to two kilometers below the surface in the mine. Therefore, the water in the tunnel water source 1 itself has a high pressure and flow rate. When the water consumption of other water-using equipment in the mine, excluding the tunneling machine spray system, is high, the pressure and flow rate of the tunnel water source 1 of the tunneling machine spray system will decrease accordingly. When the water consumption of other water-using equipment in the mine, excluding the tunneling machine spray system, is low, the pressure and flow rate of the tunnel water source 1 of the tunneling machine spray system will increase accordingly.

[0040] It should be noted that the "tunnel water source 1" in this disclosure refers to a water source device connected to the mine's original underground water source, such as a device that provides a main water inlet for the spray system. This water source device can be installed at the tunneling machine and then connected to the mine's deep underground water source via pipeline.

[0041] The spray system's treatment methods for water at different pressures in roadway water source 1 will be described in detail in the control methods section below.

[0042] In this illustrated embodiment, the first branch originates from the tunnel water source 1 after the pressure sensor 2. A high-pressure water pump 4 is installed in the first branch to provide high-pressure water, ensuring the intensity and range of the spray. A pressure reducing valve 3 is installed upstream of the high-pressure water pump 4 in the first branch to reduce the tunnel high-pressure water pressure to a range that the pump can withstand; in this embodiment, this pressure range is chosen to be below 10 bar. A bar is a unit of pressure; 1 bar = 0.1 MPa = 1 kilogram-force.

[0043] An overflow water path is provided downstream of the high-pressure water pump 4. The overflow water path leads to the water tank 8 through the overflow valve 6 and the first check valve 7. A pressure gauge 5 is installed at the overflow valve 6 to set the pressure value of the overflow valve 6 and to serve as a reference value for fault diagnosis. In this embodiment, the pressure gauge 5 can be set on-site. The overflow valve 6 is used to set the maximum total pressure of the spray system and also acts as a safety valve to protect the spray system from high-pressure pulses of water flow, ensuring the safety of all components in the spray system. The first check valve 7 is used to prevent wastewater discharged from the overflow water path from flowing back to the overflow valve 6 and causing damage.

[0044] The spray pipes direct water to the work surface or hazardous area to achieve complete coverage. The control system can automatically adjust the operating status of the spray system based on environmental parameters monitored by sensors.

[0045] In an optional embodiment, pressure reducing valve 3 is used to reduce the pressure of the high-pressure water in the tunnel to a pressure range that the water pump can withstand. For example, pressure reducing valve 3 can reduce the pressure of the high-pressure water in the tunnel to below 10 bar.

[0046] When water from the roadway water source 1 enters the first branch as described above, the pressure reducing valve 3 first reduces the water pressure to below 10 bar. To protect the safety of the pipeline and the high-pressure water pump 4, the water with a pressure below 10 bar is sent to the high-pressure water pump 4. The motor drives the high-pressure water pump 4 to pressurize the water to above 40 bar. The 40 bar is a standard value specified in coal mines to meet the water pressure requirements for the nozzle assembly 13 to spray. Workers can set the pressure value and fault reference value of the overflow valve 6 on-site using the pressure gauge 5. When the water pressure exceeds the preset value of the overflow valve 6, water exceeding the preset value will flow out of the overflow valve 6 and be transported to the water tank 8 via the first one-way valve 7. The first one-way valve 7 is used to prevent wastewater in the return pipe from flowing back to the overflow valve 6, thus preventing damage to the overflow valve 6.

[0047] In this illustrated embodiment, the second branch is connected in parallel with the first branch. The second branch branches off from the tunnel water source 1 after the pressure sensor 2, and a second one-way valve 9 is provided in the second branch to ensure that the tunnel water source 1 can reach the nozzle assembly 13 smoothly and prevent backflow.

[0048] In an optional embodiment, the opening pressure of the second check valve 9 needs to be relatively low, therefore it is set to 0.5 bar and has an automatic reset function. In other embodiments, the valve value can be set according to the needs of the actual working environment.

[0049] Through the second branch as set up above, when the pressure of the tunnel water source 1 monitored in real time by the pressure sensor 2 is greater than the pressure value preset by the remote control center, the water in the tunnel water source 1 will flow directly into the third branch through the second branch.

[0050] In the illustrated embodiment, the second branch merges with the first branch after the overflow valve 6 downstream of the overflow water path, and the third branch connects to the nozzle assembly 13 of the spray system after passing through the flow meter 10, the throttle valve 11 and the switching valve 12 in sequence.

[0051] The flow meter 10 monitors the flow rate of the high-pressure water after the first and second branches merge and transmits it to the remote control center. The throttle valve 11 controls the amount of high-pressure water delivered to the nozzle assembly 13 as needed. The switching valve 12 controls the on / off state of the spray system; in an optional embodiment, the switching valve 12 is connected to the remote control center, allowing operators to remotely control its operation. The nozzle assembly 13 is the outlet for the spray medium, and the spray angle and spray volume can be adjusted as needed. The nozzle assembly 13 atomizes the high-pressure water flow into water mist, which can be used for dust suppression and cooling of the tunneling machine equipment.

[0052] In the embodiment shown in the figure, the nozzle assembly 13 includes eight nozzles: six for internal spraying and two for external spraying. The water pressure for the internal and external sprays is different. In other embodiments, the number of nozzles and the water pressure can be arranged according to actual needs.

[0053] With the third branch as set above, when high-pressure water enters the third branch, the flow meter 10 first monitors the flow rate of the high-pressure water, then the throttle valve 11 controls the delivery volume of the high-pressure water, and finally the switch valve 12 controls the on / off of the high-pressure water. The high-pressure water enters the nozzle assembly 13 through the switch valve 12, and the nozzle assembly 13 atomizes and sprays the high-pressure water to achieve the effects of dust suppression and cooling of the tunneling machine equipment.

[0054] For the remote control center, pressure sensor 2, flow meter 10, and switch valve 12 communicate with the remote control center, and the remote control center controls the motor of high-pressure water pump 4 based on the measured values ​​of pressure sensor 2, flow meter 10, and switch valve 12.

[0055] In an optional embodiment, the pressure sensor 2 is installed on the roadway water source 1. The pressure sensor 2 monitors the pressure value of the roadway water source 1 and transmits it to the remote control center. The flowmeter 10 is arranged on the third branch between the confluence point of the first branch and the second branch and the throttle valve 11. The flowmeter 10 monitors the flow value of the high-pressure water after the confluence of the first and second branches and transmits it to the remote control center.

[0056] In an optional embodiment, the spray system is configured such that when the spray system is started, the remote control center sends an opening instruction to the switching valve 12. At the same time, the real-time monitoring value Q1 of the flowmeter 10 is transmitted to the remote control center and compared with the flow set value Q2. After determining that the nozzle assembly 13 and the branches are normal, an opening instruction is sent to the motor of the high-pressure water pump 4.

[0057] The pipeline of the roadway water supply pipeline will rust and the rust will wash off during the water transmission process. And when other water-using equipment in the mine fails, it is possible that the wastewater will flow back to the roadway water supply pipeline. The rust and impurities in the wastewater will cause blockages in the water circuit and valves in the roadheader spray system, resulting in a low water flow rate in the spray system pipeline. It is necessary to record the flow value Q2 when the spray system operates normally in the remote control center. The flow Q1 is monitored in real time by the flowmeter 10 and compared with Q2. When the value of Q1 is greater than or equal to Q2, it means that the nozzle assembly 13, the first branch and the second branch are all normal and there is no risk of blockage, and it can operate normally; when the value of Q1 is less than Q2, it means that there is a risk of blockage in the nozzle assembly 13, the first branch or the second branch, and the corresponding equipment needs to be shut down and inspected and repaired. The control method of the roadheader spray system after comparing the values of Q1 and Q2 is set as follows:

[0058] When Q1 > Q2, the pressure sensor 2 monitors the pressure P1 of the roadway water source 1 in real time and transmits it to the remote control center, and then compares it with the pressure set value P2 in the remote control center. If P1 > P2 and P1 is stable for N minutes and is greater than P2, the remote control center sends a closing instruction to the motor. If P1 < P2 and P1 is stable for M minutes and is less than P2, the remote control center sends an opening instruction to the motor.

[0059] When the pressure P1 of the roadway water source 1 is greater than the pressure set value P2 in the remote center and can last for N minutes, it means that other water-using equipment in the mine is not using a large amount of water at present, and the pressure of the roadway water source 1 can meet the spraying work of the spray system. The high-pressure water provided by the roadway water source 1 will pass through the second branch and open the second one-way valve 9 and directly enter the third branch to provide the required high-pressure water for the nozzle assembly 13. When the water pressure of the high-pressure water is too high, the water with excess pressure will be discharged from the overflow branch through the overflow valve 6 to keep the pressure in the system stable and ensure that all parts in the spray system are not damaged.

[0060] When Q1 < Q2, the remote control center determines that there is something abnormal with the nozzle assembly 13, the first branch, the second branch, and the third branch. At this time, the remote control center sends a closing instruction to the motor, and then sends a closing instruction to the switching valve 12. Moreover, the order of the remote control center sending a closing instruction to the motor and sending a closing instruction to the switching valve 12 cannot be reversed.

[0061] The remote control center first sends a closing instruction to the motor to stop pressurizing the water in the spray system. After the motor completely stops operating, the switching valve 12 can be closed to maximize the safety of the spray system. If the switching valve 12 is closed first and the motor is not closed in time, the water pressure in the spray system will increase sharply, causing impact damage to each component and even triggering a safety accident.

[0062] Through the roadheader spray system set as above, when the roadway water source 1 provides low-pressure water, the low-pressure water enters the first branch and is pressurized by the high-pressure water pump 4 for the nozzle assembly 13 to spray. When the roadway water source 1 provides high-pressure water, the high-pressure water directly enters the third branch through the second check valve 9 in the second branch for the nozzle assembly 13 to spray. At this time, the high-pressure water pump 4 in the first branch stops operating, preventing the high-pressure water pump 4 from having its lifespan reduced too quickly due to overuse and effectively saving energy.

[0063] In an optional embodiment, the value of M can be set to any value between 10 and 30 minutes according to the actual monitoring of the roadway water source 1, and the value of N can be set to any value between 10 and 30 minutes according to the actual monitoring of the roadway water source 1. In other embodiments, the values of M and N can also be set according to the actual needs.

[0064] In an optional embodiment, the second check valve 9 enables the roadway water source 1 to reach the nozzle assembly 13 smoothly and prevents backflow. Moreover, the opening pressure of the second check valve 9 is relatively small compared to the pressure in the roadway water source 1, and the second check valve 9 has an automatic reset function.

[0065] In an optional embodiment, the switching valve 12 can be an electronic ball valve, and the electronic ball valve is located downstream of the throttle valve 11 and upstream of the nozzle assembly 13.

[0066] In an optional embodiment, the pressure reducing valve 3 is used to reduce the water pressure of the roadway water source 1 to a pressure range that the high-pressure water pump 4 can withstand, and the high-pressure water pump 4 increases the water pressure to above the value specified by the coal mine standard.

[0067] Figure 2 This is a schematic flowchart of an embodiment of the control method for the roadheader spray system of the present disclosure.

[0068] In such as Figure 2In the illustrated embodiment, when the spray system is started, the remote control center sends an open command to the switching valve 12. At the same time, the real-time monitoring value Q1 of the flowmeter 10 is transmitted to the remote control center and compared with the flow rate set value Q2. After determining that the nozzle assembly 13, the first branch, and the second branch are all normal, an opening command is sent to the motor, where:

[0069] When Q1 > Q2, the pressure sensor 2 monitors the pressure P1 of the roadway water source 1 in real time and transmits it to the remote control center, and then compares it with the pressure set value P2 of the remote control center. If P1 > P2 and P1 remains stable for N minutes and is greater than P2, the remote control center sends a shutdown command to the motor. If P1 < P2 and P1 remains stable for M minutes and is less than P2, the remote control center sends an opening command to the motor. Among them, the value of M can be set to any value between 10 and 30 minutes according to the actual monitoring situation of the roadway water source 1, and the value of N can be set to any value between 10 and 30 minutes according to the actual monitoring situation of the roadway water source 1.

[0070] When Q1 < Q2, the remote control center determines that there is a risk of blockage in the nozzle assembly 13, the first branch, the second branch, and the third branch. At this time, the remote control center sends a shutdown command to the motor, and then sends a shutdown command to the switching valve 12. Moreover, the order of the remote control center sending a shutdown command to the motor and sending a shutdown command to the switching valve 12 cannot be reversed.

[0071] The present disclosure realizes the following functions: (1) Through the spray system set as above, the service life of the motor and the water pump can be effectively increased, and the energy consumption of the system can be reduced. By setting the parallel first branch and second branch separated from the roadway water source 1 and the corresponding spray system control method, when the roadway water source 1 provides low-pressure water, the low-pressure water can enter the first branch and be pressurized by the high-pressure water pump 4 for the nozzle assembly 13 to spray. When the roadway water source 1 provides high-pressure water, the high-pressure water directly enters the third branch through the second check valve 9 in the second branch for the nozzle assembly 13 to spray. At this time, the high-pressure water pump 4 in the first branch stops operating, preventing the high-pressure water pump 4 from having its service life reduced too quickly due to excessive use, effectively saving energy. (2) By establishing a remote control center, the staff can monitor the status of the roadheader spray system online, and can realize online fault monitoring and remote one-key start and stop functions.

[0072] The technical scope of the present disclosure is not limited to the content in the above specification. Those skilled in the art can make various deformations and modifications to the above embodiments without departing from the technical idea of the present disclosure, and these deformations and modifications should all fall within the scope of the present disclosure.

Claims

1. A spraying system for a tunneling machine, characterized in that, The spray system includes: A roadway water source (1), which is located at the total water inlet of the spray system, and a pressure sensor (2) is provided at the total water inlet; A first branch, which branches from the roadway water source (1) after the pressure sensor (2). A high-pressure water pump (4) is provided in the first branch. A pressure reducing valve (3) is provided upstream of the high-pressure water pump (4) in the first branch. An overflow water path is provided downstream of the high-pressure water pump (4). The overflow water path leads to a water tank (8) through an overflow valve (6) and a first check valve (7), and a pressure gauge (5) is provided at the overflow valve (6); A second branch, which is parallel to the first branch. The second branch branches from the roadway water source (1) after the pressure sensor (2), and a second check valve (9) is provided in the second branch; A third branch, where the second branch converges with the first branch downstream of the overflow water path to the third branch. The third branch sequentially passes through a flowmeter (10), a throttle valve (11), and a switch valve (12) and then connects to the nozzle assembly (13) of the spray system; and A remote control center. The pressure sensor (2), the flowmeter (10), and the switch valve (12) communicate with the remote control center. The remote control center controls the motor of the high-pressure water pump (4) based on the measured values of the pressure sensor (2), the flowmeter (10), and the switch valve (12); The spray system is configured such that when the spray system is started, the remote control center sends an open command to the switch valve (12). At the same time, the real-time monitoring value Q1 of the flowmeter (10) is transmitted to the remote control center and compared with the flow set value Q2. After determining that the nozzle assembly (13), the first branch, and the second branch are all normal, an open command is sent to the motor. Among them: When Q1>Q2, the pressure sensor (2) monitors the pressure P1 of the roadway water source (1) in real time and transmits it to the remote control center, and then compares it with the pressure set value P2 of the remote control center. If P1>P2 and P1 remains stable for N minutes and is greater than P2, the remote control center sends a close command to the motor, and the water of the roadway water source (1) directly flows into the third branch through the second branch. If P1<P2 and P1 remains stable for M minutes and is less than P2, the remote control center sends an open command to the motor; When Q1<Q2, the remote control center determines that there is something abnormal in the nozzle assembly (13), the first branch, the second branch, and the third branch. At this time, the remote control center sends a close command to the motor, and then sends a close command to the switch valve (12). And the order of the remote control center sending a close command to the motor and sending a close command to the switch valve (12) cannot be reversed.

2. The spray system as described in claim 1, characterized in that, The pressure sensor (2) is installed on the roadway water source (1), and the flowmeter (10) is arranged on the third branch between the confluence point of the first branch and the second branch and the throttle valve (11).

3. The spray system as described in claim 1, characterized in that, M is set to 30 minutes and N is set to 30 minutes.

4. The spray system as described in claim 1, characterized in that, The second check valve (9) enables the roadway water source (1) to reach the nozzle assembly (13) smoothly and prevents backflow. Moreover, the opening pressure of the second check valve (9) is relatively small with respect to the pressure in the roadway water source (1), and the second check valve (9) has an automatic reset function.

5. The spray system as described in claim 1, characterized in that, The switch valve (12) is an electronic ball valve, and the electronic ball valve is located downstream of the throttle valve (11) and upstream of the nozzle assembly (13).

6. The spray system as claimed in claim 1, characterized in that, The pressure reducing valve (3) is used to reduce the water pressure of the roadway water source (1) to a pressure range that the high-pressure water pump (4) can withstand, and the high-pressure water pump (4) increases the water pressure to a value above the coal mine standard.

7. The spray system as described in claim 6, characterized in that, The pressure range is set to below 10 bar, and the opening pressure of the second check valve (9) is set to 0.5 bar.

8. A method for controlling the spray system of a tunneling machine as described in claim 1, characterized in that, When the spray system is started, the remote control center sends an open command to the switch valve (12). At the same time, the real-time monitored value Q1 of the flowmeter (10) is transmitted to the remote control center and compared with the flow set value Q2. After determining that the nozzle assembly (13), the first branch, and the second branch are all normal, an open command is sent to the motor, where: When Q1>Q2, the pressure sensor (2) monitors the pressure P1 of the roadway water source (1) in real time and transmits it to the remote control center, and then compares it with the pressure set value P2 in the remote control center. If P1>P2 and P1 is stable for N minutes and is greater than P2, the remote control center sends a close command to the motor. If P1<P2 and P1 is stable for M minutes and is less than P2, the remote control center sends an open command to the motor; When Q1<Q2, the remote control center determines that the nozzle assembly (13), the first branch, the second branch, and the third branch are abnormal. At this time, the remote control center sends a close command to the motor, and then sends a close command to the switch valve (12). Moreover, the order in which the remote control center sends a close command to the motor and sends a close command to the switch valve (12) cannot be reversed.

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