Spring thermal relaxation testing device

Abstract

The invention discloses a spring thermal relaxation testing device, which comprises a high temperature box, wherein the high temperature box is internally provided with a fixed heating layer and a movable heating layer, the fixed heating layer and the movable heating layer are oppositely arranged, the fixed heating layer and the movable heating layer are internally provided with a heating element;the fixed heating layer and the movable heating layer are provided with hooks, and each spring is hung between two oppositely arranged hooks; the fixed heating layer is fixed with the inner wall of the high temperature box, the movable heating layer is fixed with a pull rod, the pull rod is connected with a tension meter, the tension meter is fixed with a hydraulic pull rod, and the hydraulic pull rod is driven by a hydraulic tank; the movable heating layer is externally provided with a heat preservation layer, and the heat preservation layer and the movable heating layer are fixed into a whole and arranged on a guide rail at the lower part of the high temperature box. The spring thermal relaxation testing device has the advantages that the heating temperature and received tension of thesprings can be controlled due to adoption of a temperature controller and a pressure control device which are controlled by a PLC, time control is performed according to a built-in time controller ofthe PLC, and thus relaxation parameters of the springs can be accurately measured and controlled.

Description

technical field [0001] The invention relates to the technical field of measurement and control, in particular to a spring relaxation measurement and control device. Background technique [0002] The relaxation rate ε of the spring is expressed as a percentage of load loss after the spring test: [0003] [0004] In the formula, F——the spring load measured before the test; [0005] Fi - the spring load determined after the test. [0006] The essence of stress relaxation is that the material produces microplastic deformation under the action of stress, and gradually accumulates it. Under the premise of keeping the strain or displacement constant, it is a phenomenon that the stress decreases with time. Stress relaxation is a fairly common phenomenon. It exists not only in elastic elements or components made of metal materials, but also in components made of non-metallic materials. It is a variety of mechanical springs (such as valve springs and buffer springs, etc.) One o...

AI Technical Summary

Problems solved by technology

These phenomena are not uncommon in daily life, and severe cases will cause huge economic losses

[0007] The device for measuring spring relaxation generally adopts a relatively primitive experimental device, and there is no measurement and control device that can automatically detect springs at different temperatures and under different tension states.

Images