Axial load sensor arranged in tri-axial tester

Abstract

The invention provides an axial load sensor arranged in a tri-axial tester. The axial load sensor comprises: a round pedestal which is fixedly connected with a sensor inductor assembly; an invert concave-shaped round shell, wherein the top of the shell is provided with a plurality of through holes in a uniform interval mode, the shell is fixedly connected with the sensor inductor assembly, the shell is fastened to the pedestal to form a closed space used for accommodating the sensor inductor assembly, and plugs are arranged in the through holes; and an isolation layer connected to the top of the shell, wherein there is a certain gap between the inner diameter of the shell and the outer diameter of the sensor inductor assembly and between the inner diameter of the shell and the outer diameter of the pedestal, and the gap between the shell and the pedestal is fixed in a seal mode through using an annular isolation film seal device. The measure precision of the tri-axial tester is substantially improved through the above structure of the axial load sensor arranged in the tri-axial tester.

Description

technical field [0001] The invention relates to a sensor, in particular to a built-in axial load sensor of a triaxial tester. Background technique [0002] In the geotechnical test, the triaxial tester has become an indispensable common instrument for measuring the strength and deformation index of soil. The axial pressure sensor in the triaxial testing machine is an important part of the triaxial testing machine, and its performance is directly related to the measurement accuracy of the triaxial testing machine. [0003] In the prior art, the axial pressure sensor in the triaxial testing machine is generally placed outside the triaxial pressure chamber. During the triaxial test, the triaxial pressure chamber must maintain a certain pressure (usually 0.1 to 3Mpa), which requires the triaxial piston to not only ensure the up and down movement of the piston shaft, but also to have good sealing (no water leakage). , leak). During the test, when the sample is displaced by for...

AI Technical Summary

Problems solved by technology

Therefore, under the influence of friction force, the triaxial instrument with external sensor is used for geotechnical tests, especially the test under the conditions of low stress and small deformation (small dynamic stress), the test results are particularly affected by friction force, resulting in measurement The accuracy deviation is large, which distorts the test results

In order to eliminate the influence of friction, in the prior art, there has been a technical solution of placing a waterproof and pressure-resistant axial pressure sensor inside the triaxial pressure chamber. The components are integrated structure, the environmental pressure (lateral pressure) will still have a certain impact on the accuracy of the measurement, and produce a lateral effect (increase with the increase of the environmental pressure)

Images