Test system and test method for hydraulic cylinder with loading friction force characteristic

Abstract

The invention relates to a measuring system and a measuring method of hydraulic cylinder characteristic. The technical solution is following: the oil outlet of the oil pump (9) is connected to the P hole of the electric liquid servo valve (13); A hole or B hole of the electric liquid servo valve (13) are connected to the non-rod cavity of the measured hydraulic cylinder (2); the rod cavity of the measured hydraulic cylinder (2) is connected to the tank (11); the measured hydraulic cylinder (2) is installed in a sealed frame (1); the measured hydraulic cylinder (2) is mounted with a displacement sensor (3); the displacement sensor (3) is electrically connected to the A / D-1 of the data collecting card (6); the A hole or B hole of the electric liquid servo valve (13) are electrically connected to the pressure sensor (4) connected to the measured hydraulic cylinder (2) and the A / D-1 of the data collecting card (6) of the pressure sensor (4); the data collecting card (6) and the computer assistant measuring software (5) are installed in the computer. The invention has the characteristics of simple structure, precise measurement and high level of automation.

Description

technical field [0001] The invention belongs to the technical field of hydraulic component testing. In particular, it relates to a testing system and testing method for the dynamic friction characteristic of a hydraulic cylinder belt. Background technique [0002] The hydraulic system is widely used in important parts of metallurgical production equipment due to its advantages of high power, fast response and high precision. The hydraulic cylinder is the actuator of the hydraulic system. Its friction force during the load movement has a great impact on the performance of the entire hydraulic system. The nonlinear friction force not only brings a dynamic dead zone, but also affects the stability and Bandwidth also has adverse effects, so it is necessary to accurately test the dynamic friction characteristics of the hydraulic cylinder. Especially for low-friction servo hydraulic cylinders, rolling mill hydraulic press (AGC) servo hydraulic cylinders and other demanding servo...

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Problems solved by technology

The test results of this method include the friction force of the loaded hydraulic cylinder, the structure is more complicated, and the test accuracy is also affected

[0005] 2. Existing research and practice on friction test of servo hydraulic cylinder (Zeng Liangcai. Automatic test of friction force of servo cylinder with automatic roll gap control of large rolling mill. Hydraulic and Pneumatic, 2002(1), pp26-28; Luo Fusheng, Zhao Lianli, Zhou Shichang. Research on Sealing and Friction of Hydraulically Pressed Servo Cylinder, 1996 (5), pp15-16), only the test and research of the starting friction of the servo hydraulic cylinder were carried out, but no servo hydraulic cylinder was loaded. Test and Research of Dynamic Friction Force

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