Axial pre-tightening force sensor

Abstract

The invention relates to an axial pre-tightening force sensor. The axial pre-tightening force sensor comprises a regulating gasket 2, a left end cover 3, an elastic sensitive element 4, a strain gage 5, a right end cover 6, a thrust ball bearing 7, an axial hole groove 9, a right bolt 10, a fairlead 11, a package shell 12 and a left bolt 13. The regulating gasket is used for regulating the axial position of the sensor on a shaft, the left end cover and the right end cover support the elastic sensitive element through bosses, the elastic sensitive element generates axial strain because of bearing axial force, and the axial force can be measured through the resistance strain effect and a measuring circuit. The axial hole groove 9 in the right end cover 6 of the sensor is matched with the right bolt 10 to be used for preventing the elastic sensitive element from generating circumferential strain in a pre-tightening process, axial displacement of the right end cover 6 and axial strain of the elastic sensitive element 4 are allowed, and the thrust ball bearing is used for insulating circumferential twisting force generated when the pre-tightening force is exerted so that the axial twisting force can be prevented from being transmitted to the elastic sensitive element 4.

Description

technical field [0001] The invention relates to an axial force sensor. The axial force sensor is suitable for measuring axial pressure or axial pretightening force, and is especially suitable for force measurement occasions requiring pre-stretching of ball screws in measuring mechanical equipment. Background technique [0002] The invention belongs to the field of axial force measurement. At present, ball screw pairs are used to drive the moving parts in many high-end equipment. The axial stiffness and thermal expansion of the ball screw have an important impact on the dynamic accuracy of the moving parts. In order to improve the axial stiffness of the ball screw and reduce the influence of thermal elongation on the dynamic accuracy of the moving parts, in practice, the ball screw is usually installed in a pre-tensioned way, and the pre-tension force of the ball screw varies in a large range, from Thousands of cattle to tens of thousands of cattle. Most of the existing axi...

AI Technical Summary

Problems solved by technology

Although the capacitive sensor has the advantages of non-contact measurement and small heating effect, it is easy to cause the nonlinear output of the sensor when measuring the axial preload. At the same time, the existence of parasitic capacitance will reduce the conversion efficiency and cause measurement errors.

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