2D force transducer in small measurement range

Abstract

The invention belongs to technique for measuring force. Three consecutive intersectant through holes of two groups are made on elastic body. Left and right strain gauges, and upper and down strain gauges are stuck on two outer surfaces (largest strain occurs) of the said through holes of two groups in elastic body so as to constitute Wheatstone half bridge. One fixed end of protection cover is fit to the fixed end of the elastic body tightly, and the other end is fit to a spacing ring tightly. Cantilever of the elastic body passes through square hole of the spacing ring. Being extended to the square hole on the base seat, the fixed end of the protection cover is pressed on inner sidewall of the square hole by pad through holding screw. There are eight through holes on the base seat. Sensors are fixed on worktable. Features are: simple structure, high rigidity, safety and reliability. The transducer is applicable to biomimetic viscous material.

Description

1. Technical field [0001] The two-dimensional small-range force sensor of the invention belongs to the mechanical testing technology, and is used for the mechanical performance testing of bionic viscous materials, and can also be used for general friction testing. 2. Background technology [0002] In the process of researching bionic adhesive materials (such as polyurethane, etc.) of gecko and bee feet, we need to test three functions of the material: adhesion test in single vertical direction, friction test in single horizontal direction and two-dimensional motion Adhesion and friction tests. Therefore, it is necessary to develop a special two-dimensional force sensor capable of measuring force in the horizontal direction and vertical direction at the same time. [0003] One of the currently known two-dimensional force sensors used for friction tests is a combined sensor, such as the document "A two-dimensional force sensor for friction coefficient testing" [Shi Yan, Diese...

AI Technical Summary

Problems solved by technology

This kind of sensor can perform micro-friction tests in various contact modes, and guarantees test accuracy and resolution. Its disadvantages are that the overall stiffness of the elastic body is small and easy to deform; the natural frequency is low, which is not conducive to dynamic testing; there is no overload protection structure; in 2004 Li Haiwen and others from the Changchun Research Institute of the Chinese Academy of Sciences proposed a new type of silicon micro-force sensor in "Research on Force Sensors for Micro-friction Testers" [Precision Engineering, August 2002, Volume 10, Issue 4]. Formed into a silicon beam with a cantilever beam film and strain gauge resistance, the sensor has a sensitivity of 65V / N, a resolution of 46 microN, and an overall accuracy of 2.3%

This kind of sensor structure adopts micro-mechanical technology, and the processing is more complicated. Although the test resolution and accuracy are high, the measurement range is small.

In this way, the above-mentioned sensors do not meet the requirements of this experiment in terms of structure, stiffness, and force measurement range.

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