Electronic universal testing machine encounters an unstable approach
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In the course of the test, if the pointer does not move due to deformation of the specimen or reaches the yield point, the causes of intermittent, regressive or wobbling movements and their elimination are as follows:
(1) There is air in the universal tester's oil circuit, the hydraulic pump can be started, the return valve can be closed and the delivery valve can be opened to lift the piston for a certain distance, then the oil return valve can be opened to return oil, and the pipeline can be repeatedly used several times. The air discharge;
(2) The viscosity of the oil used in the electronic universal tester is low (too dilute) and the viscosity of the oil must be adjusted;
(3) There is dirt in the delivery valve, and the delivery valve is cleaned as described above;
(4) Dirt in the return valve of the electronic universal testing machine is excluded by referring to the above method. Failure to tighten the oil return valve during loading can also cause the pointer to move unsteadily, so be sure to tighten the return valve before loading.
More details about the hydraulic universal testing machine, electronic universal testing machine, spring testing machine, and tensile testing machine are available at Jinan Yinuo Century Test Instruments Co., Ltd. For more information, please visit our website.