Load frequency response test system and method for hydraulic cylinder

Abstract

The invention relates to a load frequency response test system of a hydraulic cylinder and a test method thereof. The technical scheme of the system is as follows: the oil outlet of an oil pump (9) is communicated with the port P of an electro hydraulic servovalve (13), wherein, the opening A or the port B of the electro hydraulic servovalve (13) is communicated with the rodless chamber of a hydraulic cylinder (2) to be tested, and the rod chamber of the hydraulic cylinder (2) to be tested is communicated with an oil tank (11); the hydraulic cylinder (2) to be tested is installed in a closed stander (1); a displacement sensor (3) is installed on the hydraulic cylinder (2) to be tested and is electrically connected with the A / D port of a data collecting card (5) and a PID controller (6); and one end of a servoamplifier (7) is electrically connected with an electromagnet of the electro hydraulic servovalve (13), the other end of the servoamplifier (7) is electrically connected with one end of the PID controller (6), the other end of the PID controller (6) is electrically connected with the D / A port of the data collecting card (5), and the data collecting card (5) and computer-aided test software (4) are installed in a computer. The load frequency response test system has the advantages of simple systematic structure, accurate test and high degree of automation.

Description

technical field [0001] The invention belongs to the technical field of hydraulic component testing. In particular, it relates to a hydraulic cylinder load frequency response testing system and testing method. 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, and its response speed during the load movement has a great influence on the performance of the entire hydraulic system. Therefore, it is very necessary to accurately test the load frequency response characteristics of the hydraulic cylinder. Especially servo hydraulic cylinders for crystallizer vibration, rolling mill hydraulic pressure (AGC) servo hydraulic cylinders, alternating loading hydraulic cylinders for automotive road spectrum fatigue testing machines, etc., which require high response speed, must respond...

AI Technical Summary

Problems solved by technology

The problem with the above test method: the frequency response index of the tested servo hydraulic cylinder includes the frequency response index of the hydraulic cylinder loaded in the closed frame

That is, if the frequency response index of the loaded hydraulic cylinder is higher than that of the tested servo hydraulic cylinder, it has little effect on the test results; if the frequency response index of the loaded servo hydraulic cylinder is lower than the frequency response index of the tested servo hydraulic cylinder , the test result can only reflect the frequency response index of the loaded hydraulic cylinder, thus failing to achieve the test purpose (Edited by Wang Chunxing, Hydraulic Control System, Beijing: Machinery Industry Press, 2007.pp49)

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