A pressure maintaining operation monitoring and control system for a shield machine production

Abstract

The utility model discloses a pressure -sustaining operation monitoring control system for shield machine production, including electric cabinet and pipeline system, be equipped with power cord interface, emergency stop switch, main power control switch, pressure -in valve port, pressure -relief valve port, pressure signal input port in electric cabinet, be equipped with air intake regulating valve, pressure -relief valve and pressure sensor on the pipeline system, and the pipeline system still is equipped with N1 interface, N2 interface, N3 interface, N1 interface connects gas source, and N3 interface connects measured equipment, and N2 interface connects pressure -relief valve, and pressure -relief valve connects pressure -relief valve port in electric cabinet, and pressure sensor is connected with pressure signal input port in electric cabinet, and air intake regulating valve is connected with pressure -in valve port in electric cabinet, and emergency stop switch, main power control switch all are connected with power cord interface, the utility model solves the problem of low efficiency, poor safety, inaccurate detection result of pressure -sustaining operation in shield machine production.

Description

Technical Field

[0001] This utility model belongs to the field of tunnel boring machine technology, specifically relating to a pressure-maintaining operation monitoring and control system for tunnel boring machine production. Background Technology

[0002] During the manufacturing process of tunnel boring machines (TBMs), many components, such as sealing chambers and hydraulic system components, require pressure holding operations to verify whether their sealing and pressure resistance meet design requirements. The core of the pressure holding operation is to maintain the pressure of the medium inside the tested component within a set range and to monitor pressure changes in real time to promptly detect any abnormal pressure conditions.

[0003] Currently, pressure monitoring and control in tunnel boring machine (TBM) production largely employs traditional methods. On one hand, pressure monitoring relies heavily on manual reading of pressure gauges, which is not only inefficient but also prone to errors, making it difficult to accurately capture subtle pressure fluctuations. On the other hand, when the pressure exceeds the set range, manual operation is required for pressure release or replenishment, resulting in a delayed response that may damage the tested components due to overpressure or insufficient pressure holding, thus affecting the test results. Furthermore, in emergency situations, the time lag between manual emergency stops and pressure release actions poses a safety hazard. Summary of the Invention

[0004] Therefore, this utility model provides a pressure-holding operation monitoring and control system for tunnel boring machine production, which solves the problems of low efficiency, poor safety, and inaccurate detection results in pressure-holding operations during tunnel boring machine production.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a pressure-maintaining operation monitoring and control system for tunnel boring machine production, comprising an electrical control box and a pipeline system; the electrical control box is equipped with a power line interface, an emergency stop switch, a main power control switch, a pressure inlet valve port, a pressure relief valve port, and a pressure signal input port; the pipeline system is equipped with an air inlet regulating valve, a pressure relief valve, and a pressure sensor, and the pipeline system is also equipped with N1 interface, N2 interface, and N3 interface; the N1 interface is connected to an air source, the N3 interface is connected to the device under test, the N2 interface is connected to the pressure relief valve, and the pressure relief valve is connected to the pressure relief valve port in the electrical control box; the pressure sensor is connected to the pressure signal input port in the electrical control box, and the air inlet regulating valve is connected to the pressure inlet valve port in the electrical control box; the emergency stop switch and the main power control switch are both connected to the power line interface.

[0006] As a preferred solution for the pressure holding operation monitoring and control system for tunnel boring machine production, the electrical control box is also equipped with a touch screen display. The touch screen display is connected to the control unit inside the electrical control box. The touch screen display is used to input the set pressure value, pressure upper and lower limit thresholds, and pressure holding time parameters.

[0007] As a preferred solution for the pressure-holding operation monitoring and control system for tunnel boring machine production, the top of the electrical control box is equipped with a three-color alarm light. The three-color alarm light is electrically connected to the control unit inside the electrical control box. The three-color alarm light is used to issue an alarm signal when the pressure value collected by the pressure sensor exceeds a set threshold.

[0008] As a preferred solution for the pressure-maintaining operation monitoring and control system for tunnel boring machine production, the emergency stop switch is linked to the control unit in the electrical control box. When the emergency stop switch is pressed, the air supply input of the air intake regulating valve is cut off, and the pressure relief valve is opened.

[0009] As a preferred solution for the pressure-maintaining operation monitoring and control system for tunnel boring machine production, the pressure sensor is used to collect real-time pressure signals in the pipeline system, and the pressure sensor transmits the real-time pressure signals to the control unit in the electrical control box through the pressure signal input port.

[0010] As a preferred solution for the pressure-maintaining operation monitoring and control system for tunnel boring machine production, the air intake regulating valve is used to regulate the amount of medium input from the air source to the pipeline system. The regulating action of the air intake regulating valve is controlled by the control unit in the electrical control box through the output command of the pressure valve port.

[0011] As a preferred solution for the pressure-holding operation monitoring and control system for tunnel boring machine production, the pressure relief valve is used to discharge excess medium when the pressure in the pipeline system exceeds the limit. The opening action of the pressure relief valve is controlled by the control unit in the electrical control box through the pressure relief valve port output command.

[0012] As a preferred solution for the pressure-maintaining operation monitoring and control system for tunnel boring machine production, the power cord interface is compatible with 220V AC power.

[0013] The beneficial effects of this utility model are as follows: First, compared to the existing method of relying solely on manual monitoring of pressure holding operations, this utility model, through the linkage design of the electrical control box and the pipeline system, can realize automatic response when the pressure is abnormal. At the same time, the emergency stop switch can directly cut off the air supply input of the air intake regulating valve and trigger pressure relief, effectively avoiding safety accidents such as explosions and object strikes caused by prolonged overpressure or delayed manual response, and significantly reducing the safety risks of pressure holding operations.

[0014] Secondly, this utility model uses a pressure sensor to collect pressure signals in the pipeline system in real time and transmits the signals to the control unit of the electrical control box, replacing the traditional method of manually reading pressure gauges, reducing manual reading errors, and accurately capturing subtle pressure fluctuations; at the same time, the adjustment action of the air intake regulating valve is controlled by the control unit through the output command of the pressure valve port, which can stably maintain the pressure of the tested equipment within the set range, ensuring the accuracy of the pressure holding operation test results and avoiding test deviations caused by unstable pressure control.

[0015] Third, this utility model realizes automated monitoring and control of pressure holding operations, eliminating the need for staff to continuously monitor pressure at close range and manually operate start-stop and pressure relief, thus reducing manual input and labor intensity; at the same time, the overall cost of related equipment and accessories is low, enabling intelligent upgrades of pressure holding operations with less economic investment, which is more in line with the economic needs of tunnel boring machine production scenarios compared to complex and expensive monitoring equipment.

[0016] Fourth, this utility model can be flexibly adjusted according to the form of the pressure-holding material. Only the pressure sensor needs to be replaced to adapt to the monitoring and control requirements of different forms of pressure-holding media. There is no need to configure a complete set of equipment separately for different scenarios, which improves the equipment's versatility and reusability, and meets the diverse pressure-holding detection requirements of different components in the production of tunnel boring machines. Attached Figure Description

[0017] To more clearly illustrate the embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0018] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the implementation conditions of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportional relationships, or adjustments to the size, without affecting the effects and purposes that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model.

[0019] Figure 1 This is a schematic diagram of the mechanical structure of the pressure-holding operation monitoring and control system for tunnel boring machine production provided in this embodiment of the utility model; Figure 2 This is a schematic diagram of the architecture of the pressure-maintaining operation monitoring and control system for tunnel boring machine production provided in this embodiment of the utility model.

[0020] In the diagram: 1. Electrical control box; 2. Piping system; 11. Power cord interface; 12. Emergency stop switch; 13. Main power control switch; 14. Pressure inlet valve port; 15. Pressure relief valve port; 16. Pressure signal input port; 17. Three-color alarm light; 18. Touch screen display; 21. Inlet regulating valve; 22. Pressure relief valve; 23. Pressure sensor; 24. N1 interface; 25. N2 interface; 26. N3 interface. Detailed Implementation

[0021] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0022] See Figure 1 and Figure 2 This utility model provides a pressure-maintaining operation monitoring and control system for tunnel boring machine production, including an electrical control box 1 and a pipeline system 2. The electrical control box 1 is equipped with a power cord interface 11, an emergency stop switch 12, a main power control switch 13, a pressure inlet valve port 14, a pressure relief valve port 15, and a pressure signal input port 16. The pipeline system 2 is equipped with an air inlet regulating valve 21, a pressure relief valve 22, and a pressure sensor 23. The pipeline system 2 is also equipped with an N1 interface 24, an N2 interface 25, and an N3 interface 26. The N1 interface 24 is connected to an air source, the N3 interface 26 is connected to the device under test, the N2 interface 25 is connected to the pressure relief valve 22, and the pressure relief valve 22 is connected to the pressure relief valve port 15 in the electrical control box 1. The pressure sensor 23 is connected to the pressure signal input port 16 in the electrical control box 1, and the air inlet regulating valve 21 is connected to the pressure inlet valve port 14 in the electrical control box 1. The emergency stop switch 12 and the main power control switch 13 are both connected to the power cord interface 11.

[0023] In this system, pipeline system 2 serves as the medium transmission channel, using interfaces N1 24, N2 25, and N3 26 to respectively achieve gas source access, pressure relief, and connection to the device under test, forming a complete pressure-maintaining medium circulation path. The connection between pressure sensor 23 and pressure signal input port 16 of electrical control box 1 provides a real-time pressure data acquisition channel for the system, ensuring the control unit can monitor the pressure status within the pipeline in real time. The connection between inlet regulating valve 21 and pressure inlet valve port 14, and pressure relief valve 22 and pressure relief valve port 15, allows electrical control box 1 to directly control the medium input and pressure relief actions, achieving pressure regulation. The connection between emergency stop switch 12, main power control switch 13, and power line interface 11 ensures the on / off control of system power supply and rapid power-off operation in emergencies, providing basic safety assurance for system operation.

[0024] In this embodiment, the electrical control box 1 is also equipped with a touch screen display 18, which is connected to the control unit inside the electrical control box 1. The touch screen display 18 is used to input the set pressure value, upper and lower pressure thresholds, and pressure holding time parameters. Before the pressure holding operation, the operator can directly input the required pressure value, pressure safety range, and pressure holding duration of the tested equipment through touch operation. These parameters are transmitted to the control unit in real time and stored. During the operation, the control unit monitors and controls the pressure in the pipeline based on these set parameters. When the actual pressure reaches the set pressure value, the control unit controls the air intake regulating valve 21 to adjust the input to maintain pressure stability. At the same time, the touch screen display 18 can also display the pressure data, operation time, and other information fed back by the control unit in real time, allowing the operator to intuitively grasp the operation progress and improve the flexibility and visualization of the system operation.

[0025] In this embodiment, a three-color alarm light 17 is installed on the top of the electrical control box 1. The three-color alarm light 17 is electrically connected to the control unit inside the electrical control box 1. The three-color alarm light 17 is used to issue an alarm signal when the pressure value collected by the pressure sensor 23 exceeds a set threshold. The three-color alarm light 17 is electrically connected to the control unit, which compares the actual pressure value collected by the pressure sensor 23 with the preset upper and lower pressure thresholds in real time. When the actual pressure value is lower than the lower threshold, the control unit outputs a command to make the three-color alarm light 17 light up with the corresponding color, such as yellow indicating insufficient pressure, requiring timely pressure replenishment; when the actual pressure value is higher than the upper threshold, the control unit outputs a command to make the three-color alarm light 17 light up with a warning color, such as red indicating excessive pressure, requiring emergency pressure relief; when the pressure is within the normal range, the alarm light can light up the normal operating color green or remain off. Through different colored light signals, staff can quickly identify the type of pressure abnormality. Even in distant work areas, problems can be detected in time by the alarm light color, avoiding equipment damage or safety accidents caused by failure to detect pressure abnormalities in time.

[0026] In this embodiment, the emergency stop switch 12 is linked to the control unit in the electrical control box 1. Pressing the emergency stop switch 12 cuts off the air supply input to the air intake regulating valve 21 and opens the pressure relief valve 22. In case of an emergency during operation, such as a sudden pressure increase, abnormal equipment noise, or personnel misoperation, the operator presses the emergency stop switch 12, which sends an emergency stop signal to the control unit. Upon receiving this signal, the control unit immediately outputs two sets of control commands: one set is sent to the air intake regulating valve 21 to close it, cutting off the air supply input and preventing further pressure increases due to continued input of media into the pipeline; the other set of commands is sent to the pressure relief valve 22 to open it, quickly discharging excess media from the pipeline and reducing the pipeline pressure to a safe range. This linked action is completed instantly upon pressing the emergency stop switch 12, significantly shortening emergency response time, minimizing the harm to the tested equipment and personnel in emergency situations, and improving the system's safety protection level.

[0027] In this embodiment, pressure sensor 23 is used to collect real-time pressure signals within the pipeline system 2. Pressure sensor 23 transmits these signals to the control unit within the electrical control box 1 via pressure signal input port 16. Since pressure sensor 23 is connected to pressure signal input port 16 of the electrical control box 1, the converted electrical signal is transmitted to the control unit through this port. The control unit is equipped with a signal processing module that converts the received analog signal into a digital signal and performs real-time comparison and analysis with the set pressure threshold input on the touch screen 18. Through this signal acquisition and transmission process, the control unit can continuously and accurately monitor pressure changes within the pipeline, providing precise data for subsequent pressure regulation, abnormal alarms, and emergency pressure relief, ensuring that pressure maintenance operations are always performed within the preset pressure range.

[0028] In this embodiment, the intake regulating valve 21 is used to regulate the amount of medium input from the air source into the pipeline system 2. The regulating action of the intake regulating valve 21 is controlled by the control unit in the electrical control box 1 through the pressure inlet valve port 14. Since the intake regulating valve 21 is connected to the pressure inlet valve port 14 of the electrical control box 1, the control unit can output an electrical signal command to the intake regulating valve 21 through this port to control the valve core to move and adjust the valve opening. In the initial stage of pressure holding operation, if the actual pressure in the pipeline is lower than the set pressure value, the control unit will output a command to increase the opening of the intake regulating valve 21, accelerate the medium input rate, and make the pressure rise quickly to the set value; when the pressure reaches the set value, the control unit will output a command to decrease the opening to maintain a small amount of medium input to compensate for possible minor leakage in the pipeline and ensure that the pressure is stable within the set range; if the pressure fluctuates slightly, the control unit will adjust the valve opening in real time according to the signal fed back by the pressure sensor 23 to achieve dynamic balance control of the pressure and ensure the stability and accuracy of the pressure holding operation.

[0029] In this embodiment, the pressure relief valve 22 is used to discharge excess medium when the pressure in the pipeline system 2 exceeds the limit. The opening action of the pressure relief valve 22 is controlled by the control unit in the electrical control box 1 through the pressure relief valve port 15. The pressure relief valve 22 is connected to the pressure relief valve port 15 of the electrical control box 1. The control unit determines whether the pressure relief valve 22 needs to be opened based on the real-time pressure data fed back by the pressure sensor 23. When the actual pressure value exceeds the preset pressure upper limit threshold, the control unit outputs an opening command to the pressure relief valve 22 through the pressure relief valve port 15, causing the valve structure inside the pressure relief valve 22 to activate, opening the pressure relief channel. The excess pressure-holding medium in the pipeline will flow into the pipeline connected to the N2 interface 25 through the pressure relief valve 22 and be discharged from the system, thereby reducing the pressure in the pipeline. When the pressure drops to a safe range, the control unit outputs a closing command to restore the pressure relief valve 22 to the closed state and stop the pressure relief. In addition, when the emergency stop switch 12 is pressed, the control unit will also simultaneously output an opening command to the pressure relief valve 22 to achieve emergency pressure relief, further ensuring system safety and avoiding damage to the equipment caused by overpressure.

[0030] In this embodiment, the power cord interface 11 is compatible with 220V AC power. 220V AC power is a standard power supply commonly found in industrial production scenarios. The compatibility of the power cord interface 11 with this voltage specification allows the system to be powered directly by connecting to the existing power supply lines at the construction site without requiring additional dedicated power supply equipment, thus lowering the barrier to entry and associated costs. Simultaneously, the 220V AC power supply provides a stable voltage output to the control unit, touch screen 18, tri-color alarm light 17, and other electrical components within the electrical control box 1, ensuring their normal operation. Adapting to a standard voltage also enhances the system's versatility, allowing for flexible deployment in different tunnel boring machine production workshops or construction sites without requiring modifications due to power supply differences, thereby improving the system's practicality and adaptability.

[0031] The working principle of this utility model is as follows: First, connect the N1 interface 24 of pipeline system 2 to the air source and the N3 interface 26 to the equipment under test to be pressure-tested on the tunnel boring machine. Connect the equipment to a 220V AC power source through the power cord interface 11 of the electrical control box 1 and close the main power control switch 13. At this time, the three-color alarm light 17 in the electrical control box 1 will light up, indicating that the system power supply is normal. The operator inputs the pressure-testing operation parameters through the touch screen 18 of the electrical control box 1, including the required pressure setting value for the equipment under test, the upper and lower pressure limits to prevent overpressure or insufficient pressure, and the duration of the pressure-testing operation. These parameters will be transmitted to the control unit in the electrical control box 1 in real time and stored, providing a reference for subsequent operation control.

[0032] After receiving the set parameters, the control unit, during the pressure establishment and dynamic maintenance phase, outputs a control command to the air intake regulating valve 21 of the pipeline system 2 through the pressure inlet valve port 14, opening the air intake regulating valve 21 and adjusting its opening degree. The air source enters the pipeline system 2 through the N1 interface 24, and after the air intake regulating valve 21 controls the medium input rate, it flows to the device under test connected to the N3 interface 26, gradually establishing pressure for the device under test. During this process, the pressure sensor 23 on the pipeline system 2 continuously collects real-time pressure signals within the pipeline, converts the physical pressure signal into a 4-20mA analog electrical signal, and transmits it to the control unit through the pressure signal input port 16. The control unit converts the received analog signal to obtain the actual pressure digital value and compares it with the preset pressure value in real time. If the actual pressure is lower than the preset pressure value, the control unit increases the opening of the air intake regulating valve 21 to accelerate the medium input. If the actual pressure is close to the preset pressure value, the control unit decreases the opening of the air intake regulating valve 21 to slow down the medium input. When the actual pressure reaches the preset pressure value, the control unit controls the air intake regulating valve 21 to maintain a small opening to compensate for possible minor leaks in the pipeline, ensuring that the pressure inside the tested equipment is stable within the set range and entering the pressure holding state.

[0033] During the pressure maintenance phase, the control unit continuously compares the actual pressure value collected by the pressure sensor 23 with the preset upper and lower pressure thresholds to achieve anomaly monitoring and automatic handling. If the actual pressure exceeds the upper pressure threshold (overpressure risk), the control unit immediately sends an opening command to the pressure relief valve 22 through the pressure relief valve port 15, opening the pressure relief valve 22. Excess medium in the pipeline flows through the pressure relief valve 22 to the pipeline connected to the N2 interface 25 for discharge. At the same time, the control unit triggers the three-color alarm light 17 on the top of the electrical control box 1 to light up a red warning signal, indicating to the staff that the pressure has exceeded the limit. When the pressure drops to a safe range (below the upper threshold), the control unit controls the pressure relief valve 22 to close, and the three-color alarm light 17 returns to normal.

[0034] If the actual pressure is lower than the lower pressure threshold (insufficient pressure), the control unit controls the intake regulating valve 21 to increase the opening to replenish the medium and increase the pressure. At the same time, the three-color alarm light 17 is triggered to light up a yellow warning signal. After the pressure returns to the normal range, the alarm light is reset and the intake regulating valve 21 returns to the pressure holding opening.

[0035] If a sudden emergency occurs during operation, the operator can press the emergency stop switch 12 on the electrical control box 1. The emergency stop switch 12 sends an emergency stop signal to the control unit. Upon receiving the signal, the control unit immediately performs two safety actions: first, it controls the intake regulating valve 21 to be completely closed through the pressure inlet valve port 14, cutting off the air supply and preventing the pressure from rising further; second, it controls the pressure relief valve 22 to be fully opened through the pressure relief valve port 15, quickly discharging the medium in the pipeline and reducing the system pressure to a safe value.

[0036] Once the preset pressure holding time has elapsed, the control unit determines that the pressure holding operation is complete. It first closes the intake regulating valve 21 to stop the medium input, and then opens the pressure relief valve 22 to release pressure from the pipeline system 2 and the equipment under test. After the pressure sensor 23 detects that the pressure in the pipeline has dropped to atmospheric pressure, the control unit closes the pressure relief valve 22, ending the pressure holding operation. Simultaneously, the control unit stores the pressure fluctuation curves throughout the entire operation. Personnel can subsequently export the data through relevant interfaces for operation review and quality analysis.

[0037] Although the present invention has been described in detail above with general descriptions and specific embodiments, some modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. A pressure-maintaining operation monitoring and control system for tunnel boring machine production, characterized in that, Includes electrical control box (1) and piping system (2); The electrical control box (1) is equipped with a power cord interface (11), an emergency stop switch (12), a main power control switch (13), an inlet valve port (14), a pressure relief valve port (15), and a pressure signal input port (16); the pipeline system (2) is equipped with an inlet regulating valve (21), a pressure relief valve (22), and a pressure sensor (23); the pipeline system (2) is also equipped with an N1 interface (24), an N2 interface (25), and an N3 interface (26); The N1 interface (24) is connected to the gas source, the N3 interface (26) is connected to the device under test, the N2 interface (25) is connected to the pressure relief valve (22), and the pressure relief valve (22) is connected to the pressure relief valve port (15) in the electrical control box (1). The pressure sensor (23) is connected to the pressure signal input port (16) in the electrical control box (1), and the air intake regulating valve (21) is connected to the pressure inlet valve port (14) in the electrical control box (1); the emergency stop switch (12) and the main power control switch (13) are both connected to the power line interface (11).

2. The pressure-maintaining operation monitoring and control system for tunnel boring machine production according to claim 1, characterized in that, The electrical control box (1) is also equipped with a touch screen (18), which is connected to the control unit inside the electrical control box (1). The touch screen (18) is used to input the set pressure value, pressure upper and lower limit thresholds and pressure holding time parameters.

3. The pressure-maintaining operation monitoring and control system for tunnel boring machine production according to claim 1, characterized in that, The top of the electrical control box (1) is equipped with a three-color alarm light (17), which is electrically connected to the control unit inside the electrical control box (1). The three-color alarm light (17) is used to issue an alarm signal when the pressure value collected by the pressure sensor (23) exceeds the set threshold.

4. The pressure-maintaining operation monitoring and control system for tunnel boring machine production according to claim 1, characterized in that, The emergency stop switch (12) is linked to the control unit in the electrical control box (1). When the emergency stop switch (12) is pressed, the air supply input of the air intake regulating valve (21) is cut off, and the pressure relief valve (22) is opened.

5. The pressure-maintaining operation monitoring and control system for tunnel boring machine production according to claim 1, characterized in that, The pressure sensor (23) is used to collect real-time pressure signals in the pipeline system (2). The pressure sensor (23) transmits the real-time pressure signals to the control unit in the electrical control box (1) through the pressure signal input port (16).

6. The pressure-maintaining operation monitoring and control system for tunnel boring machine production according to claim 1, characterized in that, The intake regulating valve (21) is used to regulate the amount of medium input from the gas source to the pipeline system (2). The regulating action of the intake regulating valve (21) is controlled by the control unit in the electrical control box (1) through the pressure valve port (14).

7. The pressure-maintaining operation monitoring and control system for tunnel boring machine production according to claim 1, characterized in that, The pressure relief valve (22) is used to discharge excess medium when the pressure in the pipeline system (2) exceeds the limit. The opening action of the pressure relief valve (22) is controlled by the control unit in the electrical control box (1) through the pressure relief valve port (15).

8. The pressure-maintaining operation monitoring and control system for tunnel boring machine production according to claim 1, characterized in that, The power cord interface (11) is compatible with 220V AC power.

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