Active protection system of hydraulic servo system

Abstract

The invention relates to the technical field of active protection systems of hydraulic servo systems, and discloses an active protection system of a hydraulic servo system, which comprises an overload protection module, a temperature control module, a leakage monitoring module, a vibration suppression module, a redundancy design module and an intelligent control module, the overload protection module comprises a pressure sensor and a servo valve current limiting structure, the temperature control module comprises an oil temperature sensor and a self-adaptive cooling system, the leakage monitoring module comprises a flow meter and a pressure attenuation monitoring unit, and the vibration suppression module comprises an acceleration sensor and an active damping servo valve. The redundancy design module comprises a double-servo-valve parallel structure and double hydraulic pump sets. The intelligent control module comprises a fault diagnosis unit and a dynamic parameter compensation unit. Through the system, a multi-dimensional active protection system can be formed, and the safety, reliability and stability of the hydraulic servo system are improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of active protection systems for hydraulic servo systems, and specifically relates to an active protection system for a hydraulic servo system. Background Art

[0002] A hydraulic servo system is a system that precisely controls the position, speed, and force of a load by adjusting the flow rate and pressure of hydraulic components.

[0003] During the energy transfer process of a hydraulic servo system, there are significant mechanical and thermal energy losses. Especially in traditional valve control systems, relief valves and throttle valves can cause a large amount of energy waste. Moreover, hydraulic oil is vulnerable to particulate contaminants and moisture, which can lead to clogging of the actuator or jamming of the spool. At the same time, the seals of hydraulic pipelines are prone to aging or leakage under high-temperature and high-pressure conditions, polluting the environment and possibly causing fires. On the other hand, the viscosity and bulk modulus of elasticity of hydraulic oil change significantly with temperature. Friction losses increase at low temperatures, and leakage increases and cavitation may occur at high temperatures, directly affecting the system response speed and stability. The system has complex dynamic characteristics such as the non-linearity of the pressure-flow characteristics of the valve and Coulomb friction, which are prone to self-excited oscillation or control errors, and complex compensation algorithms are required to maintain stability. There is a lack of a multi-dimensional active protection system, and the safety, reliability, and stability of the hydraulic servo system are poor. Therefore, we propose an active protection system for a hydraulic servo system. Summary of the Invention

[0004] The purpose of the present invention is: to form a multi-dimensional active protection system and improve the safety, reliability, and stability of the hydraulic servo system. The present application provides an active protection system for a hydraulic servo system.

[0005] The technical solution adopted by the present invention is as follows: An active protection system for a hydraulic servo system, the active protection system includes an overload protection module, a temperature control module, a leakage monitoring module, a vibration suppression module, a redundancy design module, and an intelligent control module; The overload protection module includes a pressure sensor and a servo valve current limiting structure. The temperature control module includes an oil temperature sensor and an adaptive cooling system. The leakage monitoring module includes a flow meter and a pressure decay monitoring unit. The vibration suppression module includes an acceleration sensor and an active damping servo valve. The redundancy design module includes a dual servo valve parallel structure and a dual hydraulic pump group. The intelligent control module includes a fault diagnosis unit and a dynamic parameter compensation unit.

[0006] In a preferred embodiment of the invention, the pressure sensor is installed at the outlet of the hydraulic pump or the highest point of the main oil circuit pressure. The pressure sensor is used to monitor the system pressure in real time and trigger the protection mechanism when the pressure exceeds the set threshold; the flow-limiting structure of the servo valve is integrated at the front end of the inlet port of the servo valve. The flow-limiting structure of the servo valve is used to limit the flow peak and prevent the spool from jamming or being damaged due to sudden increase in flow.

[0007] In a preferred embodiment of the invention, the oil temperature sensor is installed in the hydraulic oil tank or pipeline. The oil temperature sensor is used to continuously detect the oil temperature; the adaptive cooling system is installed on the return oil pipeline of the hydraulic system. The adaptive cooling system is used to cool down the high-temperature oil returned by the actuator.

[0008] In a preferred embodiment of the invention, the number of the flow meters is two, and the two flow meters are respectively installed on the outlet of the hydraulic pump and the inlet pipeline of the hydraulic motor. The flow meters are used for synchronous monitoring of the main oil circuit and the branch oil circuit.

[0009] In a preferred embodiment of the invention, the pressure decay monitoring unit is installed at the front end of the relief valve and the end of the oil supply pipeline of the hydraulic motor. The pressure decay monitoring unit is used to monitor the output pressure stability of the hydraulic pump and the pressure fluctuation before the relief valve operates.

[0010] In a preferred embodiment of the invention, the acceleration sensor is installed at the bearing seat or end cover of the hydraulic pump, motor and actuator. The acceleration sensor is used to capture the high-frequency vibration signal of the rotating components; the active damping servo valve is installed on the oil supply or return pipeline of the hydraulic cylinder. The active damping servo valve is used to achieve dynamic damping control by adjusting the flow. When the acceleration sensor detects abnormal vibration of the hydraulic cylinder, the active damping servo valve can respond quickly to suppress the vibration.

[0011] In a preferred embodiment of the invention, the dual servo valve parallel structure is installed on the oil supply or return pipeline of the hydraulic motor. The dual servo valve parallel structure is used to adjust the flow and pressure through independent channels to achieve redundant control or load sharing; the dual hydraulic pump group is installed in parallel at the inlet of the main oil supply pipeline of the system. The dual hydraulic pump group is used to operate synchronously or alternately to achieve flow superposition or redundant backup to meet the requirements of high pressure and large flow.

[0012] In a preferred embodiment of the invention, the fault diagnosis unit and the dynamic parameter compensation unit are integrated in the control cabinet of the hydraulic servo system. The fault diagnosis unit is used to receive the feedback signals from the acceleration sensor, the flow meter, the pressure sensor and the oil temperature sensor in real time, and compare and analyze them with the preset parameters to quickly identify system anomalies. The dynamic parameter compensation unit is used to adjust parameters such as the servo valve flow and the hydraulic cylinder movement trajectory in real time.

[0013] In summary, due to the adoption of the above technical solutions, the beneficial effects of the present invention are as follows: 1. In the present invention, when the system pressure exceeds the limit and the oil temperature is abnormal at the same time, the intelligent control module can coordinate the actions of current limiting, cooling and flow regulation, avoid the spread of single faults, and form a multi-dimensional active protection system through the integration of overload protection, temperature control, leakage monitoring and vibration suppression, so as to improve the safety, reliability and stability of the hydraulic servo system.

[0014] 2. In the present invention, the pressure, oil temperature, acceleration and flowmeter are all arranged at key monitoring points. Combining with the current limiting structure of the servo valve and the active damping servo valve, rapid anomaly detection and dynamic compensation are realized for real-time monitoring and rapid response.

[0015] 3. In the present invention, the parallel structure of the dual servo valves supports main-backup switching or collaborative flow splitting. When the main valve fails, the standby valve can seamlessly take over to ensure the continuous operation of the actuator; the dual hydraulic pump sets supply oil synchronously or alternately to avoid single pump overload and meet the large flow demand, improving the safety, reliability and stability of the hydraulic servo system. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the active protection system in the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] In order to make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0018] The following will be combined with Figure 1 A detailed description will be given of the active protection system of a hydraulic servo system according to an embodiment of the present invention. Embodiment

[0019] Refer to Figure 1, An active protection system for a hydraulic servo system. The active protection system includes an overload protection module, a temperature control module, a leakage monitoring module, a vibration suppression module, a redundancy design module, and an intelligent control module; the overload protection module includes a pressure sensor and a servo valve flow limiting structure. The pressure sensor is installed at the outlet of the hydraulic pump or the highest point of the main oil circuit pressure. The pressure sensor is used to monitor the system pressure in real time. When the pressure exceeds the set threshold, it triggers a protection mechanism; the servo valve flow limiting structure is integrated at the front end of the servo valve inlet. The servo valve flow limiting structure is used to limit the flow peak and prevent the spool from jamming or being damaged due to a sudden increase in flow; specifically, through the collaborative design of the pressure sensor and the servo valve flow limiting structure in the overload protection module, an integrated control of precise monitoring - dynamic suppression - active protection is achieved, which can significantly reduce the failure rate of the hydraulic system and extend the life of key components.

[0020] Refer to Figure 1 , The temperature control module includes an oil temperature sensor and an adaptive cooling system. The oil temperature sensor is installed in the hydraulic oil tank or pipeline. The oil temperature sensor is used to continuously detect the oil temperature; the adaptive cooling system is installed on the return oil pipeline of the hydraulic system. The adaptive cooling system is used to cool down the high-temperature oil returned by the actuator; specifically, when the system pressure exceeds the limit and the oil temperature is abnormal at the same time, the intelligent control module can coordinate the actions of flow limiting, cooling, and flow regulation to avoid the spread of a single fault. By integrating overload protection, temperature control, leakage monitoring, and vibration suppression, a multi-dimensional active protection system is formed to improve the safety, reliability, and stability of the hydraulic servo system.

[0021] Refer to Figure 1, the leakage monitoring module includes a flowmeter and a pressure decay monitoring unit. The number of flowmeters is two, and the two flowmeters are respectively installed on the hydraulic pump outlet and the inlet pipeline of the hydraulic motor. The flowmeter is used for synchronous monitoring of the main oil circuit and the branch oil circuit; the pressure decay monitoring unit is installed at the front end of the relief valve and the end of the oil supply pipeline of the hydraulic motor. The pressure decay monitoring unit is used for monitoring the output pressure stability of the hydraulic pump and the pressure fluctuation before the relief valve operates; the vibration suppression module includes an acceleration sensor and an active damping servo valve. The acceleration sensor is installed at the bearing seat or end cover of the hydraulic pump, the motor, and the actuator. The acceleration sensor is used for capturing high-frequency vibration signals of the rotating components; the active damping servo valve is installed on the oil supply or return pipeline of the hydraulic cylinder. The active damping servo valve is used for realizing dynamic damping control by adjusting the flow rate. When the acceleration sensor detects abnormal vibration of the hydraulic cylinder, the active damping servo valve can respond quickly to suppress the vibration; specifically, by arranging the pressure sensor, the oil temperature sensor, the acceleration sensor, and the flowmeter at key monitoring points for monitoring. When the pressure sensor detects that the pressure exceeds the set threshold, the flow-limiting structure of the servo valve immediately limits the flow peak value to prevent spool jamming or system overload; when the oil temperature sensor detects that the pressure exceeds the set threshold, the data of the oil temperature sensor triggers the adaptive cooling system to adjust the cooling power and avoid performance degradation caused by overheating of the oil; when the acceleration sensor captures high-frequency vibration signals, the active damping servo valve quickly adjusts the flow rate to suppress the vibration amplitude and reduce equipment fatigue damage; the flowmeter monitors the flow fluctuation, combines with the pressure decay monitoring unit to accurately locate the leakage point or abnormal flow, realizes rapid anomaly detection and dynamic compensation, and conducts real-time monitoring and rapid response.

[0022] Refer to Figure 1 , the redundancy design module includes a dual servo valve parallel structure and a dual hydraulic pump group. The dual servo valve parallel structure is installed on the oil supply or return pipeline of the hydraulic motor. The dual servo valve parallel structure is used for adjusting the flow rate and pressure through independent channels to realize redundancy control or load sharing; the dual hydraulic pump group is installed in parallel at the inlet of the system main oil supply pipeline. The dual hydraulic pump group is used for synchronous or alternating operation to realize flow superposition or redundancy backup to meet the requirements of high pressure and large flow rate; specifically, the dual servo valve parallel structure supports main-backup switching or collaborative flow splitting. When the main valve fails, the standby valve can seamlessly take over to ensure the continuous operation of the actuator; the dual hydraulic pump group supplies oil synchronously or alternately to avoid single pump overload and meet the large flow rate requirement, and improves the safety, reliability, and stability of the hydraulic servo system.

[0023] Refer to Figure 1, the intelligent control module includes a fault diagnosis unit and a dynamic parameter compensation unit. The fault diagnosis unit and the dynamic parameter compensation unit are integrated in the control cabinet of the hydraulic servo system. The fault diagnosis unit is used to receive feedback signals from the acceleration sensor, flowmeter, pressure sensor, and oil temperature sensor in real time, and compare and analyze them with preset parameters to quickly identify system anomalies. The dynamic parameter compensation unit is used to adjust parameters such as the flow rate of the servo valve and the movement trajectory of the hydraulic cylinder in real time. Specifically, the fault diagnosis unit monitors the operating state of the hydraulic system in real time by integrating the feedback signals of the acceleration sensor, flowmeter, pressure sensor, and oil temperature sensor, and compares and analyzes them with preset parameters to quickly identify situations such as overpressure, flow rate fluctuations, or abnormal oil temperature. Moreover, the fault diagnosis unit can classify anomalies such as spool jamming, seal failure, or oil contamination, and trigger priority alarms according to the severity to avoid the spread of faults. The dynamic parameter compensation unit can adjust the PID parameters of the servo valve flow rate in real time according to working condition parameters such as oil temperature and load changes to ensure flow rate stability and avoid system oscillations caused by oil temperature fluctuations or sudden load changes.

[0024] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the existence of additional identical elements in the process, method, article or device comprising the element.

[0025] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. These modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An active protection system for a hydraulic servo system, characterized in that: The active protection system includes an overload protection module, a temperature control module, a leakage monitoring module, a vibration suppression module, a redundancy design module, and an intelligent control module; The overload protection module includes a pressure sensor and a servo valve flow limiting structure. The temperature control module includes an oil temperature sensor and an adaptive cooling system. The leakage monitoring module includes a flow meter and the pressure decay monitoring unit. The vibration suppression module includes an acceleration sensor and an active damping servo valve. The redundancy design module includes a dual servo valve parallel structure and a dual hydraulic pump set. The intelligent control module includes a fault diagnosis unit and a dynamic parameter compensation unit.

2. The active protection system of a hydraulic servo system according to claim 1, characterized in that: The pressure sensor is installed at the outlet of the hydraulic pump or the highest point of the main oil circuit pressure. The pressure sensor is used to monitor the system pressure in real time and trigger a protection mechanism when the pressure exceeds the set threshold. The servo valve flow limiting structure is integrated at the front end of the servo valve inlet. The servo valve flow limiting structure is used to limit the flow peak and prevent the spool from jamming or being damaged due to sudden increase in flow.

3. The active protection system of a hydraulic servo system according to claim 1, characterized in that: The oil temperature sensor is installed in the hydraulic oil tank or pipeline. The oil temperature sensor is used to continuously detect the oil temperature. The adaptive cooling system is installed on the return oil pipeline of the hydraulic system. The adaptive cooling system is used to cool down the high-temperature oil returned by the actuator.

4. The active protection system of a hydraulic servo system according to claim 1, characterized in that: The number of the flow meters is two, and the two flow meters are respectively installed on the outlet of the hydraulic pump and the inlet pipeline of the hydraulic motor. The flow meters are used for synchronous monitoring of the main oil circuit and the branch oil circuit.

5. The active protection system of a hydraulic servo system according to claim 1, characterized in that: The pressure decay monitoring unit is installed at the front end of the overflow valve and the end of the oil supply pipeline of the hydraulic motor. The pressure decay monitoring unit is used to monitor the output pressure stability of the hydraulic pump and the pressure fluctuation before the overflow valve operates.

6. The active protection system of a hydraulic servo system according to claim 1, characterized in that: The acceleration sensor is installed at the bearing seat or end cover of the hydraulic pump, motor, and actuator. The acceleration sensor is used to capture the high-frequency vibration signal of the rotating components. The active damping servo valve is installed on the oil supply or return pipeline of the hydraulic cylinder. The active damping servo valve is used to achieve dynamic damping control by adjusting the flow. When the acceleration sensor detects abnormal vibration of the hydraulic cylinder, the active damping servo valve can quickly respond to suppress the vibration.

7. The active protection system of a hydraulic servo system according to claim 1, characterized in that: The dual servo valve parallel structure is installed on the oil supply or return pipeline of the hydraulic motor. The dual servo valve parallel structure is used to adjust the flow and pressure through independent channels to achieve redundancy control or load sharing. The dual hydraulic pump set is installed in parallel at the inlet of the main oil supply pipeline of the system. The dual hydraulic pump set is used to operate synchronously or alternately to achieve flow superposition or redundancy backup to meet the high-pressure and large-flow requirements.

8. The active protection system of a hydraulic servo system according to claim 1, characterized in that: The fault diagnosis unit and the dynamic parameter compensation unit are integrated in the control cabinet of the hydraulic servo system. The fault diagnosis unit is used to receive the feedback signals from the acceleration sensor, the flow meter, the pressure sensor, and the oil temperature sensor in real time, and compare and analyze them with the preset parameters to quickly identify system abnormalities. The dynamic parameter compensation unit is used to adjust parameters such as the servo valve flow and the hydraulic cylinder movement trajectory in real time.

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