Follow-up multi-point contact type hoop strain measurement device

Abstract

The present invention provides a follow-up multi-point contact type hoop strain measurement device. The device comprises a connecting ring, a fixing device and an LVDT sensor. A plurality of mounting members are evenly distributed to pass through the sidewall of the connecting ring, wherein the mounting members are square and are provided with circular through holes. The fixing device and the LVDT sensor are alternately arranged in the through holes through connecting pieces. The fixing device comprises a fixing rod having the telescopic function, and end caps arranged at the two ends of the fixing rod, wherein one end cap in contact with a sample at the center of the connecting ring is an arc-shaped end cap. The arc shape of the arc-shaped end cap is matched with the outer periphery of the sample. A fixing device spring is sleeved onto the fixing rod. The two ends of the spring of the fixing device are respectively fixed onto the arc-shaped end cap and the mounting members. The probe of the LVDT sensor is arranged towards the sample. A sensor spring is sleeved onto the fixing rod of the LVDT sensor. The two ends of the sensor spring are respectively fixed on a probe base and the mounting members.

Description

technical field [0001] The invention relates to a follow-up multi-point contact ring strain measuring device, which belongs to the technical field of geotechnical engineering. Background technique [0002] There are many types of rocks with complex properties, and the experimental research on the mechanical properties of rocks started relatively late. At present, the indoor test to measure the hoop strain of (like) rocks usually uses resistance strain gauges or improved resistance strain gauges. The existing method can only measure the local strain at the location of the strain gauge, the measurement range is small, and the operation is complicated; other improved resistance strain gauges have low sensitivity, short life, large measurement errors, and inconvenient operation. It has become a constraint in the study of rock characteristics. Therefore, there is a need for an instrument device and method that can accurately and easily test the flatness and verticality of the en...

AI Technical Summary

Problems solved by technology

The existing method can only measure the local strain at the location of the strain gauge, the measurement range is small, and the operation is complicated; some other improved resistance strain gauges have low sensitivity, short life, large measurement errors, and inconvenient operation. It has become a constraint in the study of rock characteristics. Therefore, there is a need for an instrument device and method that can accurately and easily test the flatness and verticality of the end face of rock-like samples to solve such problems.

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