Displacement loading system applied to strain calibration device

Abstract

The invention discloses a displacement loading system applied to a strain calibration device. The system comprises a strain assembly unit, a displacement loading unit and a displacement control unit,wherein the strain assembling unit comprises a supporting cylinder, a calibration beam, a beam fixing piece and a beam centering piece, the displacement loading unit comprises a loading rod, a transmission mechanism, a high-precision stepping motor and a dynamic sealing piece, and the displacement control unit comprises a laser displacement sensor, a transmitter, a controller and an upper computer. The beam fixing piece and the beam centering piece are designed in the system. The vertical centering precision of calibration beam installation is ensured, the designed dynamic sealing piece can achieve displacement loading under high temperature and high pressure, the adopted high-precision stepping motor carries out displacement loading and real-time measurement and feedback control of the laser displacement sensor, and accurate displacement loading of the calibration device under the working conditions of high temperature and high pressure can be achieved.

Description

technical field [0001] The invention relates to the technical field of high temperature and high pressure strain calibration, in particular to a displacement loading system applied to a strain calibration device. Background technique [0002] In recent years, with the rapid development of science and technology and the unprecedented increase in productivity, higher requirements have been placed on measurement accuracy and data reliability. Strain refers to the local relative deformation of the structure under the action of external force or non-uniform temperature field and other factors, and strain gauges are usually used to test the structural strain. Therefore, strain gauges are widely used in the detection of structural deformation. [0003] Under normal temperature and pressure, the sensitivity parameters provided by the strain gauge manufacturer are used to set, and the measured strain has good authenticity and reliability. However, in aviation, aerospace, nuclear po...

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is that the existing strain calibration device has the following deficiencies: only high temperature is considered, high pressure environment is not considered, let alone the sealing of the loading system; the force loading system under high temperature is relatively simple to realize, and the load loss is comparatively relatively Serious; the displacement loading system is only manual loading in a high temperature environment, which is greatly affected by human factors, and the loading progress is poor

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