2023-12-11
Electric controlled system can be divided into telegraph servo system and electric power school proportional control system. According to the electro-hydraulic control valve used, the electro-hydraulic servo valve is used for the electro-hydraulic servo system, and the electro-hydraulic proportional valve is used for the electro-hydraulic proportional control system. Most of the testing machines use electro-hydraulic servo system. The main function of the control amplifier is to integrate, compare, correct, and amplify the power purchase signal of the input system. For the convenience of use, it often includes the regulated power supply and forehead signal generator required by the controller. Matching with the electric parking servo valve, the control amplifier is called the servo controller.The electro-hydraulic control valve is a component that converts the currentized input number of the control amplifier into hydraulic energy, and its performance greatly affects the entire system. It is a key component in the electro-hydraulic control system. There are two types of electro-hydraulic control valve: electro-hydraulic servo valve and electro-hydraulic proportional valve. Electro-hydraulic servo valves are widely used in testing machines. Electro-hydraulic proportional valves have begun to be used in universal testing machines for static performance tests and rebound hydraulic cylinders. The hydraulic cylinder accepts the pressure oil output by the servo valve to make the piston reciprocate as required. The test piece is generally installed at the end of the piston rod, and the high-pressure hydraulic pressure of the rebound hydraulic cylinder exerts a force on the test piece. The detection element includes a sensor and its amplifier. The size of the small accused is detected by the detection element. According to the question of the accused star, the sensors can be displacement sensors, force sensors, pressure sensors, acceleration sensors, etc.
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