Calibration device for calibration of rock circumferential deformation extensometer

Abstract

The invention relates to a calibration device for calibration of a rock circumferential deformation extensometer. The calibration device comprises a fixed connection part, a vertical sliding block, a transverse sliding disc and a tray, wherein an extending part is arranged at the lower end of the fixed connection part; a central hole is formed on the fixed connection part; the vertical sliding block comprises a conical platform; the axis of the fixed connection part is superposed with the axis of the central hole; the tray is positioned below the extending part; a through hole suitable for the conical platform to pass through is formed in the center of the tray; the transverse sliding disc is positioned between the extending part and the tray and is formed by splicing a plurality of fan-shaped blocks; the inner end face of each fan-shaped block is an inclined surface; the inclined angle of the inclined surface is as same as the inclined angle of the conical surface of the conical platform; a guide groove is formed in the center of each fan-shaped block along the radial direction; a guide block is arranged in the guide groove; the guide block is fixedly connected to the tray and the extending part; the width of the guide groove is as same as the width of the guide block; the length of the guide groove is more than the length of the guide block; and when all the fan-shaped blocks radially slide to the innermost end, the outer diameter of the transverse sliding disc is as same as the diameter of a rock test sample, and the inner end faces of the fan-shaped blocks and the conical face of the conical platform form contact interference.

Description

technical field [0001] The invention relates to an extensometer calibration device, in particular to a calibration device for directly calibrating a rock circumferential deformation extensometer. Background technique [0002] In the compression test of rock and soil materials, the circumferential extensometer is usually used to accurately measure the circumferential or radial deformation of the rock and soil materials. On the outer ring of the rock sample, when the rock sample expands and expands outward, the opening displacement between the knife edges at both ends of the chain is measured, which is the change in the perimeter of the cross-section of the rock sample. In order to ensure the accuracy and reliability of the measured value, the extensometer needs to be calibrated in advance. [0003] In the prior art, there is no device directly used for calibrating the extensometer of the rock circumferential deformation. Generally, the knife edge of the extensometer can only...

AI Technical Summary

Problems solved by technology

[0004] The invention provides a calibration device for calibrating a rock circumferential deformation extensometer, which solves the problem in the prior art that the circumferential deformation extensometer cannot be directly calibrated and affects measurement accuracy

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