Shield tunneling machine low-speed propelling hydraulic system suitable for wall grinding working condition

Abstract

The invention relates to the technical field of shield tunneling machine construction control, in particular to a shield tunneling machine low-speed propelling hydraulic system suitable for a wall grinding working condition. The system comprises an execution control group, a common-speed propulsion hydraulic control group and a low-speed propulsion hydraulic control group, and is used for controlling a propulsion component of the shield tunneling machine to propel at a speed lower than a common speed according to construction requirements. And the ordinary-speed propulsion hydraulic control group and the low-speed propulsion hydraulic control group are respectively and independently connected with the execution control group and respectively perform single execution switching control. The low-speed propulsion hydraulic control set is specially designed to provide stable low-speed propulsion under special working conditions such as wall grinding, so that the stability and safety of construction are improved, and particularly under complex geological conditions, the normal-speed propulsion hydraulic control set and the low-speed propulsion hydraulic control set are arranged in the system and are respectively responsible for propulsion control at different speeds, so that the construction efficiency is improved. Therefore, the speed of the shield tunneling machine can be flexibly switched according to construction requirements, and the requirements of different working conditions are met.

Description

Technical Field

[0001] The invention relates to the technical field of shield machine construction control, and in particular to a shield machine low-speed propulsion hydraulic system suitable for wall grinding working conditions. Background Art

[0002] The demand for infrastructure construction such as urban rail transit, municipal engineering, water conservancy projects, and power projects is constantly increasing, and shield tunnel construction technology has also achieved rapid development. As an indispensable and important equipment in tunnel construction, the technical level of the shield machine directly affects the construction quality and efficiency of the tunnel project. However, during the shield machine excavation process, especially when cutting underground continuous walls, in order to ensure the stability of the excavation, it is usually necessary to reduce the propulsion speed, which puts higher requirements on the propulsion structure of the shield machine.

[0003] A shield machine is a mechanical device used for tunnel excavation. Its main structure includes a front shield, a middle shield and a rear shield. The front shield has a cutterhead that cuts the soil and is responsible for excavating the tunnel. The middle shield is equipped with a thrust cylinder to provide propulsion for the machine. The rear shield usually contains auxiliary equipment and an operating system. The shield machine excavates by rotating the cutterhead and uses the force of the thrust cylinder to push the equipment forward.

[0004] The hydraulic control valve group is an important component of the hydraulic system, responsible for regulating the flow and pressure of the hydraulic oil. However, the existing hydraulic valve group cannot achieve a smooth transition from normal speed to low speed when switching speed. This shortcoming may lead to unstable operation when the propulsion speed needs to be reduced to ensure excavation stability. The control accuracy of the hydraulic system is limited, and it is difficult to achieve fine speed adjustment under various complex geological conditions. In particular, when cutting underground continuous walls, it cannot meet the strict requirements for low-speed stability. Summary of the Invention

[0005] In order to solve the problem that the existing hydraulic control components cannot meet the low-speed requirements of the shield machine propulsion components and improve the stability of propulsion speed change, the present invention provides a shield machine low-speed propulsion hydraulic system suitable for wall grinding conditions.

[0006] The present invention provides a shield machine low-speed propulsion hydraulic system suitable for wall grinding working conditions, which adopts the following technical solutions: A low-speed propulsion hydraulic system for a shield machine suitable for wall grinding working conditions includes an execution control group that connects and controls the propulsion operation of the shield machine, and further includes: The ordinary speed propulsion hydraulic control group is connected to the execution control group and further connected to the shield machine propulsion component, and is used to control the shield machine propulsion component to advance at ordinary and common speeds; The low-speed propulsion hydraulic control group is connected to the execution control group and further connected to the shield machine propulsion component, and is used to control the shield machine propulsion component to advance at a speed lower than the normal common speed according to construction needs; The conventional speed propulsion hydraulic control group and the low speed propulsion hydraulic control group are respectively connected to the execution control group and perform single execution switching control respectively.

[0007] The low-speed propulsion hydraulic control unit is specifically designed to provide stable low-speed propulsion under special conditions such as wall grinding. This helps reduce friction and vibration between the cutterhead and the tunnel wall, thereby improving construction stability and safety. Especially in complex geological conditions, the system is equipped with a standard-speed propulsion hydraulic control unit and a low-speed propulsion hydraulic control unit, each responsible for propulsion control at different speeds. This allows the shield machine to flexibly switch speeds according to construction needs and meet the requirements of different working conditions. Through the refined control of the low-speed propulsion hydraulic control unit, the shield machine can more efficiently utilize energy at low speeds, reducing unnecessary energy consumption. This not only reduces operating costs but also extends the life of the equipment. In wall grinding conditions, low-speed propulsion effectively reduces equipment wear and damage to key components such as the cutterhead and propulsion cylinder. This improves equipment reliability and maintenance cycles. Through a single execution switch control, standard and low-speed propulsion can be quickly switched, reducing downtime caused by speed adjustments and thus improving overall construction efficiency.

[0008] Furthermore, the conventional speed propulsion hydraulic control group includes a plunger pump, a conventional speed control valve group and a conventional speed detection component. The plunger pump and the conventional speed control valve group are connected to each other through oil pipelines and are commonly connected to the execution control group. The conventional speed detection component is connected to the pipeline connecting the plunger pump and the conventional speed control valve group and the execution control group, and is used to detect the hydraulic parameters inside the pipeline.

[0009] The combination of the plunger pump and the conventional speed control valve group provides the hydraulic system with stable and adjustable hydraulic flow and pressure. Through this combination, the system can maintain precise speed control during conventional speed advancement, ensuring that the shield machine operates efficiently under normal working conditions. The conventional speed detection component can monitor the hydraulic parameters in the system in real time. This real-time monitoring capability provides timely feedback to the system, helping operators to quickly adjust and optimize the advancement process to cope with different construction environments and conditions. Since the conventional speed detection component can quickly detect and feedback hydraulic parameters, the execution control group can quickly respond to any deviations or abnormalities, which improves the overall response speed of the system and reduces the efficiency loss caused by delays in the hydraulic system. Through continuous monitoring of hydraulic parameters, the conventional speed detection component can promptly identify abnormal conditions such as hydraulic overload or leakage, which not only improves the safety of the system, but also prevents potential failures and damage, thereby extending the service life of the equipment. The efficient collaboration between the plunger pump and the control valve group can achieve optimal energy utilization efficiency under conventional speed conditions. Through precise hydraulic control, it ensures that the system consumes energy only when needed, thereby reducing operating costs.

[0010] Furthermore, one end of the oil inlet of the plunger pump is connected to the oil tank through an oil pipeline, and a first filter valve and a first butterfly valve are installed on the pipeline connecting the plunger pump and the oil tank. The first filter valve is used to filter impurities flowing into the plunger pump from the oil tank, and the first butterfly valve is used to control the on-off between the plunger pump and the oil tank. The plunger pump is connected to the conventional motor through a coupling and a reducer.

[0011] By installing the first filter valve on the pipe at the oil inlet end of the plunger pump, the system can effectively filter impurities in the oil flowing into the tank. This filtering mechanism protects the plunger pump and the components of the entire hydraulic system, reduces wear and failure rate, and improves the reliability and service life of the system. The first butterfly valve is installed on the pipe between the plunger pump and the oil tank, allowing operators to easily control the flow of hydraulic oil as needed. This design provides convenience for system startup and maintenance, especially when system maintenance or emergency shutdown is required, the oil flow can be quickly cut off. The plunger pump is connected to the conventional motor through a coupling and a reducer. This design ensures the stability and efficiency of power transmission. The use of the reducer can optimize the output speed and torque of the motor, so that the plunger pump maintains stable performance under different workloads. By effectively filtering impurities and controlling oil flow, the system greatly reduces equipment wear caused by particulate contamination, which not only extends the service life of the pump and related components, but also reduces the frequency and cost of maintenance and replacement.

[0012] Furthermore, the conventional speed control valve group is connected to the oil tank through the first relief valve to form a safety pressure relief oil circuit, and the conventional speed control valve group is connected to the execution control group through the pressure regulating relief valve and the first ball valve. The pressure regulating relief valve is used to adjust and control the oil outlet pressure of the conventional speed control valve group or form an empty load return oil circuit, and the first ball valve is used to control the on-off between the conventional speed propulsion hydraulic control group and the execution control group.

[0013] The normal-speed control valve group is connected to the oil tank through the first relief valve, forming a safety pressure relief circuit. This design effectively relieves excessive pressure in the system, preventing hydraulic system failure or damage due to excessive pressure, and ensuring safe and stable system operation. The pressure-regulating relief valve is connected to the normal-speed control valve group and can adjust the oil output pressure as needed. This flexible pressure regulation mechanism allows operators to adjust the operating state of the hydraulic system according to different work requirements and environmental conditions, ensuring optimal system performance under different load conditions. The no-load return circuit allows the hydraulic system to continue operating when switching operating modes without completely shutting down. This design ensures that the system can quickly resume operation when switching back to the original operating mode, reducing downtime and delays during the switching process, and improving operational efficiency and responsiveness. The formation of the no-load return circuit allows hydraulic oil to circulate back to the tank through the return circuit when operating pressure is not required, preventing pressure buildup in the system. This not only protects hydraulic system components from damage caused by excessive pressure, but also ensures smooth system operation during the switching process. The first ball valve facilitates quick adjustment and switching between normal-speed and low-speed operating modes.

[0014] Furthermore, the conventional speed detection component includes a first pressure gauge and a first pressure sensor. The detection end of the first pressure gauge is connected to the detected pipeline and displays the hydraulic pressure value of the detected flow. The first pressure sensor is installed in the detected pipeline and converts the detected hydraulic data into an electrical signal and sends it to the data monitoring end.

[0015] The first pressure gauge is directly connected to the pipeline being tested and can display the hydraulic pressure value flowing through the pipeline in real time. This allows operators to understand the pressure conditions in the system at any time, ensure that the system operates within the set pressure range, and avoid system failures caused by excessively high or low pressure. The first pressure sensor is installed in the pipeline being tested and provides accurate pressure data collection by converting the detected hydraulic data into electrical signals and sending them to the data monitoring end. This sensor technology improves the accuracy of the data and helps to further analyze and optimize the performance of the hydraulic system.

[0016] Furthermore, the low-speed propulsion hydraulic control group includes a hydraulic pump, a low-speed control valve group and a low-speed detection component. The hydraulic pump and the low-speed control valve group are connected to each other through oil pipelines and are commonly connected to the execution control group. The low-speed detection component is connected to the pipeline connecting the hydraulic pump and the low-speed control valve group and the execution control group, and is used to detect the hydraulic parameters inside the pipeline.

[0017] The design of the low-speed control valve group enables the hydraulic system to achieve precise flow and pressure control in low-speed operation mode. Through the coordination of the hydraulic pump and control valve group, the system can operate according to the predetermined pressure and flow requirements, ensuring the stability and accuracy of the actuator at low speeds. The low-speed detection component is installed in the pipeline connecting the hydraulic pump and control valve group to the actuator control group. It can detect the hydraulic parameters inside the pipeline in real time. This real-time monitoring function helps to promptly detect abnormal pressure or flow and make necessary adjustments to ensure the safety and reliability of the hydraulic system in low-speed operation mode. The low-speed propulsion hydraulic control group achieves efficient energy utilization by optimizing the working state of the hydraulic pump and control valve group. The hydraulic system can flexibly adjust its operating mode under different operating conditions to ensure good operating performance at low speeds. Through real-time detection and control, the hydraulic system can quickly respond to various pressure changes and reduce system instability caused by fluctuations. This stability is crucial to maintaining the reliability of long-term equipment operation and reducing the incidence of failures.

[0018] Furthermore, one end of the hydraulic pump's oil inlet is connected to an oil tank via an oil pipeline, and a second filter valve and a second butterfly valve are installed on the pipeline connecting the hydraulic pump and the oil tank. The second filter valve is used to filter impurities flowing from the oil tank into the hydraulic pump, and the second butterfly valve is used to control the on-off between the hydraulic pump and the oil tank. The hydraulic pump is connected to a low-speed motor via a coupling and a reducer.

[0019] The second filter valve, installed on the pipeline between the oil tank and the hydraulic pump, is used to filter impurities flowing from the oil tank into the hydraulic pump. This filtration process ensures that the hydraulic oil used in the hydraulic system remains clean, reducing wear and damage to the hydraulic pump and other components caused by impurities, thereby extending the service life of the equipment and improving the reliability and performance of the system. The second butterfly valve is used to control the oil flow between the hydraulic pump and the oil tank. This function allows the system to interrupt oil flow when necessary for maintenance or adjustment operations, ensuring the safety and flexibility of the system. By connecting the low-speed motor through a coupling and a reducer, the hydraulic pump can operate under low-speed conditions. This design helps achieve precise speed control to meet specific operating requirements while reducing energy consumption and equipment wear. The low-speed motor drive provides smoother operation for the system, reducing vibration and noise, making it suitable for applications sensitive to noise and vibration. By combining filtering, control valves, and low-speed motor drives, the system can achieve efficient and stable operation. The filter valve ensures the cleanliness of the hydraulic oil, the control valve manages the flow, and the low-speed motor provides smooth power transmission. These functions work together to reduce the incidence of failures and improve the operating efficiency of the system.

[0020] Furthermore, the low-speed control valve group is connected to the oil tank through a second overflow valve and an electromagnetic on-off valve to form a safety pressure relief oil circuit. The second overflow valve and the electromagnetic on-off valve are connected in parallel with each other. The second overflow valve is used to limit and adjust the hydraulic safety pressure output by the normal speed control valve group. The electromagnetic on-off valve controls the normal speed control valve group to form an empty load return oil circuit. The low-speed control valve group is connected to the execution control group through a check valve and a second ball valve. The check valve is used to prevent the execution control group from returning oil to the low-speed propulsion hydraulic control group. The second ball valve is used to control the on-off between the normal speed propulsion hydraulic control group and the execution control group.

[0021] The second relief valve's primary function is to limit and regulate the output hydraulic pressure of the conventional speed control valve group to ensure the system operates within a safe pressure range. By promptly releasing excessive pressure, it prevents system overload or failure, thereby protecting the safety of hydraulic components and extending their service life. The electromagnetic on-off valve design allows the hydraulic system to switch to a no-load state without shutting down. This allows for rapid switching between different operating modes, improving production efficiency and minimizing the impact of switching time on overall operations. This design is particularly important for applications requiring frequent switching between operating modes. By creating a no-load return line, the system can continue operating without taking on load. This flexibility allows operators to maintain equipment operation while making system adjustments or inspections, reducing downtime and improving production continuity. The second ball valve controls the flow between the conventional speed propulsion hydraulic control group and the actuator control group. By opening and closing the flow path, flexible system operation is achieved, allowing for rapid switching between different operating modes to accommodate diverse operational requirements. The coordination of the second relief valve, electromagnetic on-off valve, check valve, and second ball valve enables the hydraulic system to flexibly switch between low-speed and conventional speed operating modes, ensuring stability and reliability under various operating conditions.

[0022] Furthermore, the low-speed detection component includes a second pressure gauge and a second pressure sensor, the detection end of the second pressure gauge is connected to the detected pipeline and displays the hydraulic pressure value of the detected flow, and the second pressure sensor is installed in the detected pipeline and converts the detected hydraulic data into an electrical signal and sends it to the data monitoring end.

[0023] The detection end of the second pressure gauge is connected to the pipeline being tested and can display the hydraulic pressure value in the pipeline in real time. The operator can visually observe the system pressure through the pressure gauge, promptly understand the system's operating status, and ensure that the hydraulic system is operating within the normal operating range. The second pressure sensor is installed in the pipeline being tested and can accurately detect the hydraulic pressure and convert the detected pressure data into electrical signals. These electrical signals are sent to the data monitoring end for further analysis and processing. High-precision pressure data acquisition helps improve the monitoring and control accuracy of the system.

[0024] Furthermore, the execution control group includes a secondary filter valve group and a one-way valve, which are connected in series. The secondary filter valve group is used to filter hydraulic oil impurities flowing into the shield machine propulsion component from the conventional speed propulsion hydraulic control group or the low speed propulsion hydraulic control group, and the one-way valve is used to prevent the shield machine propulsion component from returning oil to the conventional speed propulsion hydraulic control group or the low speed propulsion hydraulic control group.

[0025] The secondary filtration valve group is used to filter impurities in the hydraulic oil flowing into the shield machine propulsion component from the conventional speed propulsion hydraulic control group or the low speed propulsion hydraulic control group. Through secondary filtration, particulate matter and other impurities in the hydraulic oil can be effectively removed to ensure the cleanliness of the hydraulic oil. This can prevent impurities from entering the hydraulic system and causing damage to system components, extend the service life of the hydraulic system, and reduce the frequency of maintenance and replacement of components. The one-way valve is used to prevent the return oil of the shield machine propulsion component from flowing back to the conventional speed propulsion hydraulic control group or the low speed propulsion hydraulic control group. This can prevent impurities or contaminants in the return oil from entering the hydraulic control group, maintaining the cleanliness and efficient operation of the entire hydraulic system. In addition, the one-way valve can also prevent pressure fluctuations and backflow in the hydraulic system, protecting the normal operation of the system.

[0026] In summary, the present invention has the following beneficial technical effects: 1. The system can switch between normal and low-speed propulsion modes to adapt to different construction needs. The normal-speed propulsion hydraulic control group is used for routine propulsion operations, while the low-speed propulsion hydraulic control group is suitable for wall grinding conditions that require more precise control.

[0027] 2. The first filter valve, second filter valve and secondary filter valve group in the system work together to ensure that the hydraulic oil flowing into the hydraulic pump and shield machine propulsion components is clean, remove impurities, protect the hydraulic system, and reduce wear and maintenance costs.

[0028] 3. Various relief valves, electromagnetic on-off valves, ball valves and other components ensure that the pressure of the hydraulic system can be effectively managed within a safe range, avoiding the risk of system damage caused by overpressure.

[0029] 4. The design of the one-way valve and check valve prevents the impact of return oil on the hydraulic system, ensures the consistency of the hydraulic oil flow direction, avoids system failure caused by backflow, and improves the reliability and safety of the system.

[0030] 5. The normal speed and low speed detection components provide real-time monitoring of hydraulic parameters. The data is converted into electrical signals and sent to the monitoring end, which facilitates monitoring and fault diagnosis and improves the transparency and controllability of system operation.

[0031] 6. Through precise hydraulic control and effective filtration and pressure management, the system can maintain a stable operating state, improve the efficiency and accuracy of propulsion operations, especially under complex working conditions.

[0032] 7. The modular design of the system makes the connection and switching between components more convenient, facilitates daily maintenance and troubleshooting, and improves the maintainability of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of the hydraulic connection of the present invention.

[0034] Description of reference numerals: 1. Normal speed propulsion hydraulic control group, 11. Piston pump, 111. First filter valve, 112. First butterfly valve, 113. Normal speed motor, 12. Normal speed control valve group, 121. First relief valve, 122. Pressure regulating relief valve, 123. First ball valve, 13. Normal speed detection assembly, 131. First pressure gauge, 132. First pressure sensor, 2. Low speed propulsion hydraulic control group, 21. Hydraulic pump, 211. Second filter valve, 212. Second butterfly valve, 213. Low speed motor, 22. Low speed control valve group, 221. Second relief valve, 222. Solenoid on-off valve, 223. Check valve, 224. Second ball valve, 23. Low speed detection assembly, 231. Second pressure gauge, 232. Second pressure sensor, 3. Execution control group, 31. Secondary filter valve group, 32. One-way valve. DETAILED DESCRIPTION

[0035] The following will be combined with the Figure 1 The technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0036] In the description of the present invention, it should be understood that the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" and the like to indicate orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0037] Example 1: The embodiment of the present invention discloses a low-speed propulsion hydraulic system for a shield machine suitable for wall grinding working conditions, referring to Figure 1 , including an execution control group 3, which connects and controls the shield machine's propulsion operation, and also includes: Normal speed propulsion hydraulic control group 1, connected to the execution control group 3 and further connected to the shield machine propulsion component, is used to control the shield machine propulsion component to advance at normal and common speeds; The low-speed propulsion hydraulic control group 2 is connected to the execution control group 3 and further connected to the shield machine propulsion component, and is used to control the shield machine propulsion component to advance at a speed lower than the normal common speed according to construction needs; The conventional speed propulsion hydraulic control group 1 and the low speed propulsion hydraulic control group 2 are separately connected to the execution control group 3 and perform single execution switching control respectively.

[0038] Ensure that all hydraulic systems and actuator control group 3 are in normal working condition.

[0039] Check whether the pressure and temperature of the hydraulic oil are within the normal range.

[0040] Make sure all connecting lines and connections are free of leaks and obstructions.

[0041] Select the required propulsion mode (normal speed or low speed) through the control panel or operation interface of execution control group 3.

[0042] The current mode is displayed on the control panel so the operator can confirm the selection.

[0043] Parameters of propulsion hydraulic cylinders in the propulsion system of the earth pressure balance shield machine: φ260 / φ220-2100, a total of 22 cylinders.

[0044] When the normal speed propulsion mode is selected, the execution control group 3 activates the normal speed propulsion hydraulic control group 1, and the normal speed propulsion hydraulic control group 1 starts to provide hydraulic power to the shield machine propulsion components, supporting the shield machine to propel at normal speed, and monitoring the propulsion speed and hydraulic pressure in real time to ensure stable operation of the system.

[0045] When low-speed propulsion is required, the execution control group 3 is switched to the low-speed propulsion hydraulic control group 2. The execution control group 3 closes the normal-speed propulsion hydraulic control group 1 and activates the low-speed propulsion hydraulic control group 2. The low-speed propulsion hydraulic control group 2 starts to provide hydraulic power to the shield machine propulsion components, supporting the shield machine to propel at a speed lower than the normal speed, adjusting the hydraulic pressure to adapt to the needs of low-speed propulsion, and ensuring the smoothness and accuracy of the propulsion process.

[0046] In the execution control group 3, ensure that the switching between the normal speed propulsion hydraulic control group 1 and the low speed propulsion hydraulic control group 2 is executed separately, that is, only one control group is working at any time.

[0047] Use logic control or software programming to ensure the reliability of the switching process and avoid simultaneous activation of two control groups.

[0048] Through sensors and monitoring systems, the advancement status of the shield machine and the operating status of the hydraulic system are continuously tracked.

[0049] The current working mode and related parameter information are displayed in real time on the control panel to provide timely feedback to the operator.

[0050] Example 2: On the basis of Example 1, the following is added: Reference Figure 1 The conventional speed propulsion hydraulic control group 1 includes a plunger pump 11, a conventional speed control valve group 12 and a conventional speed detection component 13. The plunger pump 11 and the conventional speed control valve group 12 are connected to each other through oil pipelines and are commonly connected to the execution control group 3. The conventional speed detection component 13 is connected to the pipeline connecting the plunger pump 11 and the conventional speed control valve group 12 and the execution control group 3, and is used to detect the hydraulic parameters inside the pipeline.

[0051] The maximum displacement of the plunger pump 11 is 130 mL / r.

[0052] Reference Figure 1 The oil inlet end of the plunger pump 11 is connected to the oil tank through an oil pipeline. A first filter valve 111 and a first butterfly valve 112 are installed on the pipeline connecting the plunger pump 11 and the oil tank. The first filter valve 111 is used to filter impurities flowing into the plunger pump 11 from the oil tank. The first butterfly valve 112 is used to control the on-off between the plunger pump 11 and the oil tank. The plunger pump 11 is connected to a conventional speed motor 113 through a coupling and a reducer.

[0053] Reference Figure 1 The conventional speed control valve group 12 is connected to the oil tank through the first relief valve 121 to form a safety pressure relief oil circuit. The conventional speed control valve group 12 is connected to the execution control group 3 through the pressure regulating relief valve 122 and the first ball valve 123. The pressure regulating relief valve 122 is used to adjust the oil outlet pressure of the conventional speed control valve group 12 or form an empty load return oil circuit. The first ball valve 123 is used to control the on-off between the conventional speed propulsion hydraulic control group 1 and the execution control group 3.

[0054] Reference Figure 1 The conventional speed detection component 13 includes a first pressure gauge 131 and a first pressure sensor 132. The detection end of the first pressure gauge 131 is connected to the detected pipeline and displays the hydraulic pressure value of the detected flow. The first pressure sensor 132 is installed in the detected pipeline and converts the detected hydraulic data into an electrical signal and sends it to the data monitoring end.

[0055] Check the hydraulic oil level in the tank to ensure it meets operating requirements.

[0056] The first filter valve 111 and the first butterfly valve 112 are in an open state to allow the hydraulic oil to flow freely.

[0057] Start the normal speed motor 113 so that it drives the plunger pump 11 through the coupling and the reducer to start working.

[0058] The hydraulic oil flows from the oil tank into the plunger pump 11 through a pipeline.

[0059] The first filter valve 111 filters impurities in the hydraulic oil to ensure that clean hydraulic oil enters the plunger pump 11, thereby ensuring the normal operation and life of the system.

[0060] The plunger pump 11 pressurizes the hydraulic oil and delivers the high-pressure hydraulic oil to the normal speed control valve group 12 through the oil pipeline.

[0061] The normal speed control valve group 12 adjusts the pressure and flow of the hydraulic oil to meet the propulsion requirements of the shield machine.

[0062] The conventional speed control valve group 12 adjusts the output pressure of the hydraulic oil through the pressure regulating relief valve 122 to ensure that the output pressure is within the safety range of the system design.

[0063] At the same time, the first relief valve 121 provides a safe pressure relief channel to return excess pressure oil to the oil tank to prevent system overload.

[0064] The first pressure gauge 131 in the normal speed detection component 13 displays the hydraulic pressure value in the pipeline in real time, which is convenient for operators to monitor.

[0065] The first pressure sensor 132 converts the detected hydraulic data into an electrical signal and sends it to the data monitoring terminal for real-time data analysis and recording.

[0066] The normal speed control valve group 12 controls the connection with the execution control group 3 through the first ball valve 123 to start or stop the hydraulic supply to the shield machine propulsion component.

[0067] After receiving the hydraulic power, the execution control group 3 controls the shield machine propulsion component to advance at a normal speed.

[0068] Operators monitor the system's operating status through data monitoring terminals and on-site instruments, and adjust system parameters in a timely manner to maintain stable operation.

[0069] Adjust the working status of the conventional propulsion hydraulic control group 1 according to construction needs and site conditions to ensure the efficiency and safety of the propulsion operation.

[0070] Example 3: On the basis of Example 1, the following is added: Reference Figure 1 The low-speed propulsion hydraulic control group 2 includes a hydraulic pump 21, a low-speed control valve group 22 and a low-speed detection component 23. The hydraulic pump 21 and the low-speed control valve group 22 are connected to each other through oil pipelines and are commonly connected to the execution control group 3. The low-speed detection component 23 is connected to the pipeline connecting the hydraulic pump 21 and the low-speed control valve group 22 and the execution control group 3, and is used to detect the hydraulic parameters inside the pipeline.

[0071] The hydraulic pump 21 has a displacement of 16 mL / r, a rated working pressure of 40 MPa, and a peak pressure of up to 45 MPa, which meets the propulsion pressure of 35 MPa required for low-speed propulsion.

[0072] Reference Figure 1 The oil inlet end of the hydraulic pump 21 is connected to the oil tank through an oil pipeline. A second filter valve 211 and a second butterfly valve 212 are installed on the pipeline connecting the hydraulic pump 21 and the oil tank. The second filter valve 211 is used to filter impurities flowing into the hydraulic pump 21 from the oil tank. The second butterfly valve 212 is used to control the on-off between the hydraulic pump 21 and the oil tank. The hydraulic pump 21 is connected to a low-speed motor 213 through a coupling and a reducer.

[0073] The low-speed motor 213 adopts a 7.5kW variable frequency motor, and the speed range is 106r / min~265r / min to meet the flow demand. By adjusting the variable frequency controller of the low-speed motor 213, the frequency value is 3.65-9Hz to achieve the low-speed propulsion requirement of 2-5mm / min.

[0074] Reference Figure 1 The low-speed control valve group 22 is connected to the oil tank through the second relief valve 221 and the electromagnetic on-off valve 222 to form a safety pressure relief oil circuit. The second relief valve 221 and the electromagnetic on-off valve 222 are connected in parallel with each other. The second relief valve 221 is used to limit and adjust the hydraulic safety pressure output by the normal speed control valve group 12. The electromagnetic on-off valve 222 controls the normal speed control valve group 12 to form an empty load return oil circuit. The low-speed control valve group 22 is connected to the execution control group 3 through the check valve 223 and the second ball valve 224. The check valve 223 is used to prevent the execution control group 3 from returning oil to the low-speed propulsion hydraulic control group 2. The second ball valve 224 is used to control the on-off between the normal speed propulsion hydraulic control group 1 and the execution control group 3.

[0075] Reference Figure 1 The low-speed detection component 23 includes a second pressure gauge 231 and a second pressure sensor 232. The detection end of the second pressure gauge 231 is connected to the detected pipeline and displays the hydraulic pressure value of the detected flow. The second pressure sensor 232 is installed in the detected pipeline and converts the detected hydraulic data into an electrical signal and sends it to the data monitoring end.

[0076] Reference Figure 1 The execution control group 3 includes a secondary filter valve group 31 and a one-way valve 32. The secondary filter valve group 31 and the one-way valve 32 are connected in series. The secondary filter valve group 31 is used to filter the hydraulic oil impurities flowing into the shield machine propulsion component of the conventional speed propulsion hydraulic control group 1 or the low speed propulsion hydraulic control group 2. The one-way valve 32 is used to prevent the shield machine propulsion component from returning oil to the conventional speed propulsion hydraulic control group 1 or the low speed propulsion hydraulic control group 2.

[0077] Check the hydraulic oil level in the tank to ensure it meets operating requirements.

[0078] Ensure that the second filter valve 211 and the second butterfly valve 212 are in the open state to allow the hydraulic oil to flow freely.

[0079] The low-speed motor 213 is started to drive the hydraulic pump 21 through the coupling and the reducer to start working.

[0080] Hydraulic oil flows from the oil tank into the hydraulic pump 21 through a pipe.

[0081] The second filter valve 211 filters impurities in the hydraulic oil to ensure that clean hydraulic oil enters the hydraulic pump 21, thereby ensuring the normal operation and life of the system.

[0082] The hydraulic pump 21 pressurizes the hydraulic oil and delivers the high-pressure hydraulic oil to the low-speed control valve group 22 through the oil pipeline.

[0083] The low-speed control valve group 22 adjusts the pressure and flow of the hydraulic oil to meet the low-speed propulsion requirements of the shield machine.

[0084] The low-speed control valve group 22 adjusts the output pressure of the hydraulic oil through the second relief valve 221 to ensure that the output pressure is within the safety range of the system design. At the same time, the excess pressure oil is returned to the oil tank to prevent the system from overloading.

[0085] The second pressure gauge 231 in the low-speed detection component 23 displays the hydraulic pressure value in the pipeline in real time, which is convenient for operators to monitor.

[0086] The second pressure sensor 232 converts the detected hydraulic data into an electrical signal and sends it to the data monitoring terminal for real-time data analysis and recording.

[0087] The low-speed control valve group 22 controls the connection with the execution control group 3 through the second ball valve 224 to start or stop the hydraulic supply to the shield machine propulsion component.

[0088] After receiving the hydraulic power, the execution control group 3 controls the shield machine propulsion component to advance at a low speed.

[0089] The check valve 223 prevents the return oil in the execution control group 3 from entering the low-speed propulsion hydraulic control group 2, thereby ensuring the stability of the system.

[0090] Operators monitor the system's operating status through data monitoring terminals and on-site instruments, and adjust system parameters in a timely manner to maintain stable operation.

[0091] According to construction needs and site conditions, adjust the working status of the low-speed propulsion hydraulic control group 2 to ensure the efficiency and safety of the propulsion operation.

[0092] The specific operations for switching from normal speed to low speed include: On first boot: Confirm that the current normal speed propulsion operating conditions are stable and ensure that there are no abnormal pressure or flow fluctuations.

[0093] Notify relevant operators of the upcoming switchover operation so that they can prepare.

[0094] Gradually close the output of the normal speed propulsion hydraulic control group 1 and reduce the flow of the normal speed control valve group 12.

[0095] Monitor the pressure data of the normal speed detection component 13 to ensure that the pressure gradually drops to a safe level.

[0096] Close the first ball valve 123 connected to the execution control group 3 to stop the supply of normal speed hydraulic oil.

[0097] Verify that the pressure of the conventional system has returned to the tank or safe storage state.

[0098] Check the hydraulic oil level of the low speed propulsion hydraulic control group 2 to ensure there is sufficient oil in the tank.

[0099] Ensure that the second filter valve 211 and the second butterfly valve 212 are in an open state to allow the hydraulic oil to flow.

[0100] The low-speed motor 213 is started to drive the hydraulic pump 21 through the coupling and the reducer to start working.

[0101] The flow of the low-speed control valve group 22 is gradually increased, and the pressure is adjusted to the required low-speed working level through the second relief valve 221.

[0102] The hydraulic pressure is monitored by the low speed detection component 23 to ensure that the system is within a safe pressure range.

[0103] The second ball valve 224 between the low-speed control valve group 22 and the execution control group 3 is opened to start providing hydraulic power to the execution control group 3 .

[0104] Confirm that the check valve 223 is working properly to prevent oil backflow.

[0105] Monitor the system pressure and flow to ensure stable operation of low-speed propulsion hydraulic control group 2.

[0106] Observe the pressure gauge and sensor feedback of the low-speed detection component 23 to ensure that the low-speed propulsion system is stable.

[0107] Confirm that the shield machine propulsion components are operating normally at low speed.

[0108] During subsequent switching, there is no need to stop the normal speed motor 113 and the low speed motor 213 , and only the first ball valve 123 and the second ball valve 224 need to be switched.

[0109] Report the successful completion of the switch to the relevant personnel and record it in the operation log.

[0110] The above content is merely an example and explanation of the structure of the present invention. Those skilled in the art may make various modifications or additions to the described specific embodiments or replace them in a similar manner. As long as they do not deviate from the scope defined by the structure of the invention, they should all fall within the scope of protection of the present invention.

Claims

1. A shield machine low-speed propulsion hydraulic system suitable for wall grinding working conditions, comprising an execution control group (3), wherein the execution control group (3) is connected to and controls the shield machine propulsion operation, characterized in that: Also includes: A normal speed propulsion hydraulic control group (1) is connected to the execution control group (3) and further connected to the shield machine propulsion component, and is used to control the shield machine propulsion component to propel at a normal speed; A low-speed propulsion hydraulic control group (2) is connected to the execution control group (3) and further connected to the shield machine propulsion component, and is used to control the shield machine propulsion component to propel at a speed lower than the normal common speed according to construction needs; The conventional propulsion hydraulic control group (1) and the low-speed propulsion hydraulic control group (2) are respectively connected to the execution control group (3) and respectively perform single execution switching control.

2. A shield machine low-speed propulsion hydraulic system suitable for wall grinding conditions according to claim 1, characterized in that: The conventional speed propulsion hydraulic control group (1) comprises a plunger pump (11), a conventional speed control valve group (12) and a conventional speed detection component (13), wherein the plunger pump (11) and the conventional speed control valve group (12) are connected to each other through an oil pipeline and are connected to the execution control group (3), and the conventional speed detection component (13) is connected to the pipeline connecting the plunger pump (11) and the conventional speed control valve group (12) and the execution control group (3), and is used to detect hydraulic parameters inside the pipeline.

3. The low-speed propulsion hydraulic system for a shield machine suitable for wall grinding conditions according to claim 2, characterized in that: One oil inlet end of the plunger pump (11) is connected to an oil tank via an oil pipeline. A first filter valve (111) and a first butterfly valve (112) are installed on the pipeline connecting the plunger pump (11) and the oil tank. The first filter valve (111) is used to filter impurities flowing from the oil tank into the plunger pump (11). The first butterfly valve (112) is used to control the on-off between the plunger pump (11) and the oil tank. The plunger pump (11) is connected to a conventional motor (113) via a coupling and a reducer.

4. The shield machine low-speed propulsion hydraulic system suitable for wall grinding conditions according to claim 2, characterized in that: The conventional speed control valve group (12) is connected to the oil tank via the first relief valve (121) to form a safety pressure relief oil circuit. The conventional speed control valve group (12) is connected to the execution control group (3) via the pressure regulating relief valve (122) and the first ball valve (123). The pressure regulating relief valve (122) is used to regulate the oil outlet pressure of the conventional speed control valve group (12) or to form an empty load return oil circuit. The first ball valve (123) is used to control the on-off between the conventional speed propulsion hydraulic control group (1) and the execution control group (3).

5. The low-speed propulsion hydraulic system for a shield machine suitable for wall grinding conditions according to claim 2, characterized in that: The conventional speed detection component (13) comprises a first pressure gauge (131) and a first pressure sensor (132), wherein the detection end of the first pressure gauge (131) is connected to the detected pipeline and displays the hydraulic pressure value of the detected flow, and the first pressure sensor (132) is installed in the detected pipeline and converts the detected hydraulic data into an electrical signal and sends it to the data monitoring end.

6. The shield machine low-speed propulsion hydraulic system suitable for wall grinding conditions according to claim 1, characterized in that: The low-speed propulsion hydraulic control group (2) comprises a hydraulic pump (21), a low-speed control valve group (22) and a low-speed detection component (23). The hydraulic pump (21) and the low-speed control valve group (22) are connected to each other through an oil pipeline and are commonly connected to the execution control group (3). The low-speed detection component (23) is connected to the pipeline connecting the hydraulic pump (21) and the low-speed control valve group (22) and the execution control group (3) and is used to detect hydraulic parameters inside the pipeline.

7. The shield machine low-speed propulsion hydraulic system suitable for wall grinding conditions according to claim 6, characterized in that: An oil inlet end of the hydraulic pump (21) is connected to an oil tank via an oil pipeline. A second filter valve (211) and a second butterfly valve (212) are installed on the pipeline connecting the hydraulic pump (21) and the oil tank. The second filter valve (211) is used to filter impurities flowing from the oil tank into the hydraulic pump (21). The second butterfly valve (212) is used to control the on-off between the hydraulic pump (21) and the oil tank. The hydraulic pump (21) is connected to a low-speed motor (213) via a coupling and a reducer.

8. The shield machine low-speed propulsion hydraulic system suitable for wall grinding conditions according to claim 6, characterized in that: The low-speed control valve group (22) is connected to the oil tank through the second relief valve (221) and the electromagnetic on-off valve (222) to form a safety pressure relief oil circuit. The second relief valve (221) and the electromagnetic on-off valve (222) are connected in parallel with each other. The second relief valve (221) is used to limit and adjust the hydraulic safety pressure output by the normal speed control valve group (12). The electromagnetic on-off valve (222) controls the normal speed control valve group (12) to form an empty load return oil circuit. The low-speed control valve group (22) is connected to the execution control group (3) through the check valve (223) and the second ball valve (224). The check valve (223) is used to prevent the execution control group (3) from returning oil to the low-speed propulsion hydraulic control group (2). The second ball valve (224) is used to control the on-off between the normal speed propulsion hydraulic control group (1) and the execution control group (3).

9. The shield machine low-speed propulsion hydraulic system suitable for wall grinding conditions according to claim 6, characterized in that: The low-speed detection component (23) comprises a second pressure gauge (231) and a second pressure sensor (232), wherein the detection end of the second pressure gauge (231) is connected to the detected pipeline and displays the hydraulic pressure value of the detected flow, and the second pressure sensor (232) is installed in the detected pipeline and converts the detected hydraulic data into an electrical signal and transmits it to the data monitoring end.

10. The shield machine low-speed propulsion hydraulic system suitable for wall grinding conditions according to claim 1, characterized in that: The execution control group (3) includes a secondary filter valve group (31) and a one-way valve (32), wherein the secondary filter valve group (31) and the one-way valve (32) are connected in series with each other, wherein the secondary filter valve group (31) is used to filter impurities in the hydraulic oil flowing into the shield machine propulsion component from the normal speed propulsion hydraulic control group (1) or the low speed propulsion hydraulic control group (2), and the one-way valve (32) is used to prevent the shield machine propulsion component from returning oil to the normal speed propulsion hydraulic control group (1) or the low speed propulsion hydraulic control group (2).

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