The Servo Cylinder Features Test System Developed

In the steel rolling production line, hydraulic AGC(Automatic Gauge Control) control system is a very important equipment. The active components -- servo-cylinders affect the performance of the systems, which characteristics need to be tested before installation.According to the standards and principles of normal cylinder characteristics test, the hydraulic principium systems of leakage characteristics, the compression resistance, the friction characteristics and the dynamic characteristics test of the servo-cylinder are designed. The parameters of the key components are calculated and the key componentsare selected, improving the existing test systems of the servo-cylinders.The friction characteristics and the dynamic characteristics of the servo-cylinder are two important characteristics owned by servo-cylinder which are different from normal cylinder. According to the development of hydraulic components as well as advances in test technology, the proportional throttle valve is used to simulate loading pressure to get the friction characteristics. In order to analyze the dynamic characteristics of the servo-cylinder more accurately, loading system which simulate the roll forces is designed basing on the idea of the load simulator.For further analyzing of the characteristics of the loading system, the simulation is made under Matlab environment. During the simulation, the reasons of redundant forces and the methods to overcome them are given. The method of using parallel dampers to overcome the redundant force is adopted, and the PI controller is used to expand thesystem bandwidth.Basing on the hydraulic principium system, the PXI-controller based test system is built for the servo-cylinder, and some of the key sensors, the data acquirement modules are selected.Finally, the experimental of leakage characteristics, the friction characteristics are accomplished in our laboratory, using proportional position control system and PXI controller, verifying the principles proposed in this paper.