Hydraulic servo variable load loading test bench

Abstract

The invention discloses a hydraulic servo variable-load loading test bench, belongs to the field of mechanical hydraulic pressure, and relates to a fatigue test bench using an electro hydraulic servo system and being capable of realizing pressure and displacement feedback double closed loop control. The test bench consists of a control system and four loading mechanisms in parallel connection, wherein two of the four loading mechanisms in parallel connection are used for loading in the axial direction, and the other two of the four loading mechanisms in parallel connection are used for loading in the radial direction. In the control system, an industrial personal computer and a controller are connected through a data wire; and a displacement sensor and large and small force sensors are connected to the controller through data transmission wires. The loading test bench is fixed on the ground; the large force sensor for loading in the axial direction is mounted at the front end of one servo hydraulic cylinder; and the small force sensor for loading in the radial direction is mounted at the front end of the other servo hydraulic cylinder. Four control channels of the hydraulic servo variable-load loading test bench can work together; and the test bench has the advantages of simple structure, clear principle, low cost, stable long-term operation and high efficiency, and can synchronously carry out the fatigue loading for a plurality of samples.

Description

technical field [0001] The invention belongs to the field of mechanical hydraulics, and relates to a fatigue test bench which uses an electro-hydraulic servo system and can realize double closed-loop control of pressure and displacement. Background technique [0002] In construction machinery, many mechanical parts work under cyclic and alternating load conditions, and their working stress is often lower than the yield strength of the material. Under such cyclic and alternating loads, components are prone to fatigue damage after a long period of operation, which has a significant impact on the safety performance of the structure. In order to ensure the reliability of these components, they must be tested before they are put into use. The electro-hydraulic servo loading test bench is a special equipment for testing these components. [0003] In recent years, great attention has been paid to the dynamic and static fatigue experiments of materials or structures. Fatigue test e...

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Problems solved by technology

But its response is slow, and the output load range is small, etc.

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