A Displacement Loading System Applied to a Strain Calibration Device

Abstract

The invention discloses a displacement loading system applied to a strain calibration device. The system includes a strain assembly unit, a displacement loading unit and a displacement control unit, wherein the strain assembly unit includes a support cylinder, a calibration beam, a beam fixing piece and a beam centering piece , The displacement loading unit includes a loading rod, a transmission mechanism, a high-precision stepping motor and a dynamic seal, and the displacement control unit includes a laser displacement sensor, a transmitter, a controller and a host computer. The beam fixing parts and beam centering parts designed by this system ensure the vertical centering accuracy of the calibration beam installation, the designed dynamic seals can realize displacement loading under high temperature and high pressure, and the high-precision stepping motor is used for displacement loading and The real-time measurement and feedback control of the laser displacement sensor can realize the accurate displacement loading of the calibration device under high temperature and high pressure conditions.

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. Usually, strain gauges are used to measure 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 for setting, and the measured strain has good authenticity and reliability. However, in aviation, aerospace, nuclear power and other...

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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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