Load-sensing proportional control valve: key technology to achieve millisecond-level dynamic response and system stability
Publish Time: 2024-12-03
In modern industrial automation control systems, load-sensing proportional control valves (hereinafter referred to as "load sensing valves") play a vital role. Faced with rapidly changing load signals, load sensing valves can respond within milliseconds while maintaining the overall stability of the system, which is of great significance for improving production efficiency, ensuring equipment safety and optimizing energy consumption. This article will explore in depth the working principle, key technologies and applications of load sensing valves in achieving high-speed response and maintaining system stability.The core of the load sensing valve lies in its built-in load sensing mechanism and proportional control mechanism. The load sensing mechanism can monitor the changes in load in real time and convert these changes into electrical or hydraulic signals and transmit them to the proportional controller. The proportional controller adjusts the position of the valve core according to the received signal, thereby accurately controlling the flow and pressure of the hydraulic oil and achieving fast and accurate control of the actuator.To achieve millisecond-level dynamic response, the load sensing valve needs to have a highly sensitive sensor and a high-speed controller. Modern load sensing valves usually use advanced pressure sensors and displacement sensors, which are not only highly accurate but also fast in response, and can capture small changes in load in a very short time. At the same time, the proportional controller uses a high-speed digital signal processor (DSP) or a programmable logic controller (PLC), which has powerful computing power and fast algorithm execution capabilities, and can respond quickly after receiving the sensor signal and adjust the valve core position.However, it is not enough to rely solely on high-speed sensors and controllers. Load sensing valves also need to have excellent dynamic characteristics and stability. To achieve this goal, load sensing valves usually use advanced valve core design and fluid dynamics optimization technology. In terms of valve core design, load sensing valves use precision-machined valve cores and valve seats to ensure that the valve core has extremely low friction resistance and good sealing performance during movement. Fluid dynamics optimization technology reduces the vortex and resistance of the fluid in the valve by optimizing the design of the flow channel in the valve, and improves the flow efficiency and stability of the fluid.In addition, load sensing valves also usually use a closed-loop control system to monitor the actual position and speed of the actuator in real time through a feedback mechanism and compare it with the set value. When there is a deviation between the actual value and the set value, the closed-loop control system will immediately adjust the position of the valve core to eliminate the deviation, thereby ensuring the stability and accuracy of the system.In practical applications, load sensing valves are widely used in various hydraulic systems that require high precision and fast response, such as injection molding machines, excavators, cranes, etc. These equipment need to change the load frequently during operation, and the load changes in a large range and at a fast speed. The load sensing valve can quickly adapt to these changes to ensure the stable operation and efficient operation of the equipment.In summary, the load-sensing proportional control valve achieves millisecond-level dynamic response and system stability through key technologies such as high-sensitivity sensors, high-speed controllers, excellent valve core design and fluid dynamics optimization technology, and closed-loop control systems.
