Resistor strain type apparatus for measuring diameter and its use method

Abstract

The invention discloses a resistance strain diameter measuring device and a use method thereof. The resistance strain diameter measuring device comprises a resistance strain sensor with a pair of blades and twin cantilever girders, a U-shaped supporting saddle and a resistance strain measuring apparatus. The U-shaped supporting saddle is used for supporting the sensor and providing the locating restriction of a test sample, a cylindrical guide rod is horizontally arranged on the U-shaped supporting saddle, and a locating marble or a V-shaped slot are arranged on the top of the U-shaped supporting saddle. The sensor can be moved on the guide rod, a guide limiting slot is arranged at the bottom of the guide rod, a guide limiting pin is arranged at the bottom of the sensor, and the guide limiting slot and the guide limiting pin are combined, thus leading the blades of the sensor to be located right above the guide rod and rotate around the axial line of the guide rod by small angles; when measuring, the test sample is automatically located between the blades due to self gravity, the cantilever girders are led to generate deflection deformation, and the resistance strain measuring apparatus displays and records the diameter value of the test sample. The resistance strain diameter measuring device of the invention has simple structure, convenient use, high precision and good repeatability, can be conveniently used on line with computers, and consequently is suitable for the digitalizing development requirements of measuring techniques.

Description

technical field [0001] The invention relates to a device and method for measuring diameter, in particular to a resistance strain type diameter measuring device and a method for using the same, which belong to the technical field of measurement technology and mechanical test. Background technique [0002] In the mechanical performance test of materials, it is necessary to measure the cross-sectional size of the sample. For circular cross-section samples, it is necessary to measure the diameter of the sample. For example, the tensile mechanical performance test of metal materials such as carbon steel requires measuring 6 diameter data of 3 different sections within the gauge length of the sample ("Engineering Mechanics Experiment", edited by Fan Qinshan, Higher Education Press, 2006 in May). So far, in the mechanical laboratories of enterprises, schools and scientific research institutions, vernier calipers are generally used to measure the diameter of samples. Although this...

AI Technical Summary

Problems solved by technology

Although this manual measurement method is simple, it also has obvious disadvantages: first, the repeatability is poor, because the data obtained by manual measurement inevitably contain personal errors and random errors related to operating skills; second, when the number of samples is large, , the time-consuming and labor-intensive problems of manual measurement will become serious, which not only affects work efficiency, but also increases random errors, resulting in lower test quality

However, this type of device is relatively expensive, and it is difficult for ordinary users to accept it.

Images