A safety control mechanism for servo valve pilot oil and main oil circuit

Abstract

This utility model discloses a safety control mechanism for the pilot oil and main oil circuit of a servo valve, relating to the field of hydraulic control technology. It includes a pilot oil control module, a main oil circuit control module, and a monitoring and feedback module. The pilot oil control module includes a pilot oil flow sensor and a pilot oil pressure regulating valve. The pilot oil flow sensor is used to monitor the flow rate of the pilot oil in real time. The main oil circuit control module includes a main oil circuit solenoid directional valve, a main oil circuit relief valve, and a main oil circuit pressure sensor. Through the coordinated operation of the pilot oil flow sensor and the pilot oil pressure regulating valve, the pressure and flow rate of the pilot oil are monitored and dynamically adjusted in real time, providing precise control signals to the servo valve. This solves the problem of deviations in servo valve action caused by control signal fluctuations in traditional mechanisms, making the control of servo valve spool displacement and other aspects more precise. The main oil circuit pressure sensor is installed close to the servo valve, enabling timely capture of pressure changes and rapid directional switching in conjunction with the main oil circuit solenoid directional valve.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic control technology, and in particular to a safety control mechanism for the pilot oil and main oil circuit of a servo valve. Background Technology

[0002] The servo valve pilot oil and main oil circuit safety control mechanism, as a key component of the hydraulic system, relies on hydraulic control principles to precisely regulate pilot oil pressure and flow, as well as the on / off state and pressure unloading of the main oil circuit. This ensures stable operation of the servo valve and is widely used in hydraulic systems for engineering machinery, precision machine tools, and industrial automation. In practical applications, this mechanism typically integrates the following core structures to work collaboratively:

[0003] 1. Pilot oil control assembly: includes a pilot oil pressure regulating valve for precise adjustment of pilot oil pressure; and a pilot oil flow sensor to monitor pilot oil flow in real time, ensuring a stable control signal for the servo valve.

[0004] 2. Main oil circuit control components: There is a main oil circuit pressure sensor to continuously monitor the main oil circuit pressure; a main oil circuit solenoid directional valve to switch the oil circuit on and off according to pressure changes; and a main oil circuit relief valve as a safety unloading device after the pressure exceeds the limit.

[0005] 3. Monitoring and Feedback Components: Centered on the controller, these components receive and process signals from various sensors and output control commands. Paired with a monitoring box, they enable parameter display and threshold setting, thus constructing closed-loop control logic.

[0006] Currently, to improve the safety and accuracy of servo valve control, the industry employs various control mechanism design approaches. Some mechanisms focus on monitoring a single parameter (such as focusing only on the main oil circuit pressure) and rely on passive protection such as relief valves; others have attempted to integrate sensors, but these suffer from signal processing lag and poor control coordination.

[0007] However, existing technologies still have significant shortcomings: in terms of pressure response and control accuracy, traditional mechanisms struggle to cope with abnormal system pressure fluctuations, and the pilot oil and main oil circuit cannot respond in a timely manner, easily leading to system failures and equipment damage. Furthermore, the monitoring and adjustment capabilities for multi-parameter collaborative monitoring and precise adjustment of the pilot oil and main oil circuit are insufficient, making it difficult to meet the stringent requirements of high-precision hydraulic systems for control accuracy and response speed. This application proposes a solution to address these issues by integrating multiple devices to construct a closed-loop control system encompassing "monitoring-adjustment-protection," achieving precise regulation of pilot oil pressure and flow. It provides dual-level protection against abnormal pressure fluctuations in the main oil circuit through active shut-off by the electromagnetic directional valve and passive unloading by the relief valve. Relying on the controller's intelligent coordination of various components, it significantly improves the adaptability and reliability of the mechanism to complex working conditions, meeting the safety and stable operation requirements of high-precision hydraulic systems. Utility Model Content

[0008] To address the shortcomings of existing technologies, this utility model provides a safety control mechanism for the pilot oil and main oil circuit of a servo valve. This mechanism solves the problems that traditional mechanisms struggle to cope with abnormal system pressure fluctuations and fail to respond promptly to pressure changes and control precision, which can easily lead to system failures and equipment damage. Furthermore, the traditional mechanism lacks the ability to monitor and adjust multiple parameters of the pilot oil and main oil circuit in a coordinated and precise manner, making it difficult to meet the stringent requirements of high-precision hydraulic systems for control accuracy and response speed.

[0009] To achieve the above objectives, this utility model provides the following technical solution:

[0010] A servo valve pilot oil and main oil circuit safety control mechanism includes a pilot oil control module, a main oil circuit control module, and a monitoring feedback module. The pilot oil control module includes a pilot oil flow sensor and a pilot oil pressure regulating valve. The pilot oil flow sensor is used to monitor the pilot oil flow rate in real time. The main oil circuit control module includes a main oil circuit solenoid directional valve, a main oil circuit relief valve, and a main oil circuit pressure sensor. The monitoring feedback module includes a controller and a monitoring box. The monitoring box is connected to the controller. The outlet of the pilot oil flow sensor is connected to the inlet of the pilot oil pressure regulating valve. The outlet of the pilot oil pressure regulating valve is used to connect to the pilot oil interface of the servo valve. The inlet of the main oil circuit solenoid directional valve is used to connect to the main oil circuit hydraulic source. The outlet of the main oil circuit solenoid directional valve is used to connect to the main oil circuit interface of the servo valve. The main oil circuit relief valve is connected in parallel between the inlet and return ports of the main oil circuit solenoid directional valve. The main oil circuit pressure sensor is installed on the main oil circuit on the outlet side of the main oil circuit solenoid directional valve. The pilot oil pressure regulating valve is a proportional pressure valve. The pilot oil pressure regulating valve receives electrical signals from the controller and dynamically adjusts the pilot oil pressure.

[0011] Preferably, the pilot oil flow sensor is an electromagnetic flow sensor, and the main oil circuit pressure sensor is a piezoresistive pressure sensor.

[0012] Preferably, the main oil circuit solenoid directional valve is an electromagnetically controlled two-position three-way valve, the controller drives the valve core to open or close the main oil circuit, the main oil circuit relief valve is a direct-acting relief valve, and the monitoring box is equipped with a display screen and operation buttons.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] 1. By utilizing a pilot oil flow sensor and a pilot oil pressure regulating valve in synergy, the pressure and flow of the pilot oil are monitored and dynamically adjusted in real time. This provides a stable and precise control signal for the servo valve, solving the problem of deviations in servo valve action caused by control signal fluctuations in traditional mechanisms. This significantly improves the control accuracy of the servo valve, making the control of valve core displacement and other aspects more precise. The main oil circuit pressure sensor is installed close to the servo valve, which can promptly capture pressure changes. In conjunction with the main oil circuit solenoid directional valve, it can quickly switch directions and cut off the oil circuit in the instant of pressure abnormality, avoiding pressure shocks from affecting the servo valve and the system, and ensuring the timeliness and accuracy of main oil circuit pressure control.

[0015] 2. The main oil circuit is equipped with dual-stage protection: an active shut-off using a solenoid directional valve and a passive unloading using a relief valve. Abnormal pressure first triggers the solenoid directional valve to quickly cut off the flow. If the pressure is not relieved, the relief valve automatically unloads. Compared with traditional single relief valve protection, this is more effective in preventing equipment damage such as servo valve jamming and pipeline rupture due to pressure runaway. The three modules—pilot oil control, main oil circuit control, and monitoring feedback—are connected through standardized pipelines and electrical signals. The structure is clear and the functions are relatively independent. When a module fails, the controller can trigger a degradation mode to prevent complete system failure. Compared with traditional integrated mechanisms, this design offers higher reliability, and the modular design makes maintenance more convenient and reduces operating costs. Attached Figure Description

[0016] The above description is only an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, the preferred embodiments of this utility model are described in detail below with reference to the accompanying drawings.

[0017] Figure 1 This is an overall structural diagram of the present invention;

[0018] Figure 2 This is an overall plan view of the present invention;

[0019] Figure 3 This is a structural diagram of the controller of this utility model;

[0020] Figure 4 This is a structural diagram of the main oil circuit electromagnetic directional valve of this utility model.

[0021] Legend: 1. Pilot oil flow sensor; 2. Pilot oil pressure regulating valve; 3. Main oil circuit solenoid directional valve; 4. Main oil circuit overflow valve; 5. Controller; 6. Main oil circuit pressure sensor; 7. Monitoring box. Detailed Implementation

[0022] This application provides a servo valve pilot oil and main oil circuit safety control mechanism, which effectively solves the problems of traditional mechanisms in terms of pressure response and control accuracy. These mechanisms are unable to cope with abnormal system pressure fluctuations, and the pilot oil and main oil circuit cannot respond in a timely manner, which can easily lead to system failures and equipment damage. Furthermore, the traditional mechanisms lack the ability to monitor and adjust multiple parameters of the pilot oil and main oil circuit in a coordinated manner, making it difficult to adapt to the stringent requirements of high-precision hydraulic systems for control accuracy and response speed. By integrating multiple devices, a closed-loop control system of "monitoring-adjustment-protection" is constructed, which realizes precise regulation of pilot oil pressure and flow. It provides dual-level protection against abnormal fluctuations in main oil circuit pressure through active shut-off of the electromagnetic directional valve and passive unloading of the relief valve. Relying on the intelligent coordination of various components by the controller, the mechanism's adaptability and reliability to complex working conditions are greatly improved, meeting the requirements of safe and stable operation of high-precision hydraulic systems. Example

[0023] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the technical solution in this application embodiment effectively solves the technical problems of traditional mechanisms being unable to cope with abnormal system pressure fluctuations in terms of pressure response and control accuracy, the pilot oil and main oil circuit failing to respond in a timely manner, which can easily lead to system failures and equipment damage, and the insufficient monitoring and adjustment capabilities for multi-parameter coordinated monitoring and precise adjustment of the pilot oil and main oil circuit, making it difficult to adapt to the stringent requirements of high-precision hydraulic systems for control accuracy and response speed. The overall approach is as follows:

[0024] To address the problems existing in the prior art, this utility model provides a safety control mechanism for the pilot oil and main oil circuit of a servo valve, including a pilot oil control module, a main oil circuit control module, and a monitoring and feedback module. The pilot oil control module includes a pilot oil flow sensor 1 and a pilot oil pressure regulating valve 2. The pilot oil flow sensor 1 is used to monitor the pilot oil flow rate in real time. The main oil circuit control module includes a main oil circuit solenoid directional valve 3, a main oil circuit overflow valve 4, and a main oil circuit pressure sensor 6. The monitoring and feedback module includes a controller 5 and a monitoring box 7. The monitoring box 7 is connected to the controller 5. The oil outlet of the pilot oil flow sensor 1 is connected to the oil inlet of the pilot oil pressure regulating valve 2. The oil outlet of the pilot oil pressure regulating valve 2 is used to connect to the pilot oil interface of the servo valve. The main oil circuit... The inlet of the solenoid directional valve 3 is used to connect to the main hydraulic power source. The outlet of the solenoid directional valve 3 is used to connect to the main hydraulic interface of the servo valve. The main hydraulic relief valve 4 is connected in parallel between the inlet and outlet of the solenoid directional valve 3. The main hydraulic pressure sensor 6 is installed on the main hydraulic line on the outlet side of the solenoid directional valve 3. The pilot oil pressure regulating valve 2 is a proportional pressure valve. The pilot oil pressure regulating valve 2 receives electrical signals from the controller 5 to dynamically adjust the pilot oil pressure. The pilot oil output from the hydraulic power source first passes through the pilot oil flow sensor 1. The sensor captures the pilot oil flow data in real time and transmits it to the controller 5. The pilot oil then enters the pilot oil pressure regulating valve 2. The controller 5 sends electrical signals to the pressure regulating valve according to system requirements or preset parameters. The system dynamically adjusts the valve opening and precisely controls the pilot oil pressure to ensure a stable control oil source for the servo valve. The pilot oil, after pressure and flow regulation, is delivered to the pilot control port of the servo valve through pipelines, driving the servo valve spool to actuate and realize the basic control logic of the main oil circuit. The hydraulic oil from the main oil circuit hydraulic source enters the main oil circuit solenoid directional valve 3. The initial state of the valve port is determined by the system's standby / working mode. The main oil circuit pressure sensor 6 monitors the pressure near the servo valve in real time and feeds back the pressure signal to the controller 5. When the pressure is abnormal and exceeds a set threshold, the controller 5 sends a command to the main oil circuit solenoid directional valve 3 to drive the spool to switch, quickly disconnecting the main oil circuit from the servo valve and preventing abnormal pressure transmission. If the main oil circuit pressure continues to rise... When the pressure reaches the set pressure of the main oil circuit overflow valve 4, the overflow valve automatically opens, guiding the overpressured oil back to the oil tank through the return oil line to relieve the load and prevent the system from being damaged by high pressure. The controller 5, as the core unit, continuously collects the monitoring data of the pilot oil flow sensor 1 and the main oil circuit pressure sensor 6. Combined with the system's preset pressure and flow thresholds, which can be set / displayed through the monitoring box 7, it performs logical calculations and judgments. If the pilot oil pressure / flow is detected to deviate from the set value, the controller 5 immediately adjusts the control signal of the pilot oil pressure regulating valve 2 to correct the pilot oil parameters. If the main oil circuit pressure is abnormal, the main oil circuit solenoid directional valve 3 is triggered to open and close simultaneously, and the main oil circuit overflow valve 4 is unloaded, realizing closed-loop coordination of monitoring, judgment and control to ensure system safety.

[0025] Pilot oil flow sensor 1 is an electromagnetic flow sensor, main oil circuit pressure sensor 6 is a piezoresistive pressure sensor, and main oil circuit solenoid directional valve 3 is an electromagnetically controlled two-position three-way valve. Controller 5 drives the valve core to open and close the main oil circuit. Main oil circuit relief valve 4 is a direct-acting relief valve. The monitoring box 7 is equipped with a display screen and operation buttons. With the cooperation of pilot oil flow sensor 1 and pilot oil pressure regulating valve 2, the pressure and flow of pilot oil are monitored and dynamically adjusted in real time, providing a stable and accurate control signal for the servo valve. This solves the problem of deviation in servo valve action caused by control signal fluctuations in traditional mechanisms, significantly improving the control accuracy of the servo valve and making the control of valve core displacement and other aspects more precise. The main oil circuit pressure sensor 6 is installed close to the servo valve to promptly capture pressure changes and quickly switch directions in conjunction with the main oil circuit solenoid directional valve 3. The oil circuit is cut off instantly in case of abnormal pressure to avoid pressure shock affecting the servo valve and system, ensuring the timeliness and accuracy of main oil circuit pressure control. The main oil circuit is equipped with dual-stage protection: the main oil circuit solenoid directional valve 3 actively cuts off the flow and the main oil circuit relief valve 4 passively unloads the pressure. Abnormal pressure first triggers the solenoid directional valve to quickly cut off the flow. If the pressure is not relieved, the relief valve automatically unloads the pressure. Compared with traditional single relief valve protection, it can more effectively prevent equipment damage such as servo valve jamming and pipeline rupture due to pressure loss of control. The three major modules of pilot oil control, main oil circuit control and monitoring feedback are connected through standardized pipelines and electrical signals. The structure is clear and the functions are relatively independent. When a certain module fails, the controller 5 can trigger the degradation mode to avoid complete system failure. Compared with traditional integrated mechanisms, it has higher reliability, and the modular design makes maintenance more convenient and reduces operation and maintenance costs.

[0026] Working principle:

[0027] The pilot oil output from the hydraulic power source first passes through the pilot oil flow sensor 1. The sensor captures the pilot oil flow data in real time and transmits it to the controller 5. The pilot oil then enters the pilot oil pressure regulating valve 2. The controller 5 sends an electrical signal to the pressure regulating valve according to system requirements or preset parameters to dynamically adjust the valve opening and precisely control the pilot oil pressure, ensuring a stable control oil source for the servo valve. After pressure and flow regulation, the pilot oil is delivered to the pilot control port of the servo valve through the pipeline, driving the servo valve spool to move and realize the basic control logic of the main oil circuit. The hydraulic oil from the main oil circuit hydraulic power source enters the main oil circuit solenoid directional valve 3. The initial state of the valve port is determined by the system standby / working mode. The main oil circuit pressure sensor 6 monitors the pressure of the main oil circuit near the servo valve in real time and transmits the pressure signal. The signal is fed back to controller 5. When the pressure is abnormal and exceeds the set threshold, controller 5 sends a command to the main oil circuit solenoid directional valve 3 to drive the valve core to switch, quickly disconnecting the connection between the main oil circuit and the servo valve to prevent the transmission of abnormal pressure. If the pressure in the main oil circuit continues to rise and reaches the set pressure of the main oil circuit relief valve 4, the relief valve will automatically open, guiding the overpressured oil back to the oil tank through the return oil line to relieve the load and prevent the system from being damaged by high pressure. Controller 5, as the core unit, continuously collects monitoring data from pilot oil flow sensor 1 and main oil circuit pressure sensor 6. Combined with the system's preset pressure and flow thresholds, which can be set / displayed through monitoring box 7, it performs logical operations and judgments. If the pilot oil pressure / flow rate is detected to deviate from the set value, controller 5 immediately adjusts the pilot oil pressure regulating valve. The control signal 2 corrects the pilot oil parameters. If the main oil circuit pressure is abnormal, the main oil circuit solenoid directional valve 3 is triggered to open and close simultaneously, and the main oil circuit relief valve 4 is unloaded, realizing closed-loop coordination of monitoring, judgment, and control to ensure system safety. With the cooperation of pilot oil flow sensor 1 and pilot oil pressure regulating valve 2, the pressure and flow of the pilot oil are monitored and dynamically adjusted in real time, providing a stable and accurate control signal for the servo valve. This solves the problem of deviation in servo valve action caused by control signal fluctuations in traditional mechanisms, significantly improving the control accuracy of the servo valve and making the control of servo valve core displacement more precise. The main oil circuit pressure sensor 6 is installed close to the servo valve to promptly capture pressure changes and, in conjunction with the main oil circuit solenoid directional valve 3, quickly switches direction, cutting off the oil circuit instantly in case of pressure abnormalities, preventing... Pressure surges affect servo valves and the system. To ensure the timeliness and accuracy of main oil circuit pressure control, the main oil circuit is equipped with dual-stage protection: an active shut-off main oil circuit solenoid directional valve 3 and a passive unloading main oil circuit relief valve 4. Abnormal pressure first triggers the solenoid directional valve to quickly cut off the flow. If the pressure is not relieved, the relief valve automatically unloads. Compared with traditional single relief valve protection, this is more effective in preventing equipment damage such as servo valve jamming and pipeline rupture due to pressure runaway. The three modules—pilot oil control, main oil circuit control, and monitoring feedback—are connected through standardized pipelines and electrical signals, with a clear structure and relatively independent functions. When a module fails, the controller 5 can trigger a degradation mode to prevent complete system failure. Compared with traditional integrated mechanisms, this offers higher reliability, and the modular design makes maintenance more convenient.Reduce operation and maintenance costs.

[0028] Finally, it should be noted that the above embodiments are merely examples for clearly illustrating the present invention and are not intended to limit the implementation. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A safety control mechanism for the pilot oil and main oil circuit of a servo valve, characterized in that, It includes a pilot oil control module, a main oil circuit control module, and a monitoring feedback module; the pilot oil control module includes a pilot oil flow sensor (1) and a pilot oil pressure regulating valve (2), the pilot oil flow sensor (1) is used to monitor the flow rate of the pilot oil in real time; the main oil circuit control module includes a main oil circuit solenoid directional valve (3), a main oil circuit overflow valve (4), and a main oil circuit pressure sensor (6); the monitoring feedback module includes a controller (5) and a monitoring box (7), the monitoring box (7) is connected to the controller (5); Among them, the oil outlet of the pilot oil flow sensor (1) is connected to the oil inlet of the pilot oil pressure regulating valve (2), the oil outlet of the pilot oil pressure regulating valve (2) is used to connect to the pilot oil interface of the servo valve, the oil inlet of the main oil circuit solenoid directional valve (3) is used to connect to the main oil circuit hydraulic source, the oil outlet of the main oil circuit solenoid directional valve (3) is used to connect to the main oil circuit interface of the servo valve, the main oil circuit overflow valve (4) is connected in parallel between the oil inlet and the return port of the main oil circuit solenoid directional valve (3), and the main oil circuit pressure sensor (6) is installed on the main oil circuit on the oil outlet side of the main oil circuit solenoid directional valve (3).

2. The servo valve pilot oil and main oil circuit safety control mechanism as described in claim 1, characterized in that: The pilot oil pressure regulating valve (2) is a proportional pressure valve; The pilot oil pressure regulating valve (2) receives an electrical signal from the controller (5) and dynamically adjusts the pilot oil pressure.

3. The servo valve pilot oil and main oil circuit safety control mechanism as described in claim 1, characterized in that: The pilot oil pressure regulating valve (2) is a proportional pressure valve; The pilot oil pressure regulating valve (2) receives an electrical signal from the controller (5) and dynamically adjusts the pilot oil pressure.

4. The servo valve pilot oil and main oil circuit safety control mechanism as described in claim 1, characterized in that: The main oil circuit pressure sensor (6) is a piezoresistive pressure sensor.

5. The servo valve pilot oil and main oil circuit safety control mechanism as described in claim 1, characterized in that: The main oil circuit solenoid directional valve (3) is an electromagnetically controlled two-position three-way valve; The controller (5) controls the main oil circuit by driving the valve core to operate.

6. The servo valve pilot oil and main oil circuit safety control mechanism as described in claim 1, characterized in that: The main oil circuit relief valve (4) is a direct-acting relief valve; The monitoring box (7) is equipped with a display screen and operation buttons.

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