Method for measuring frictional forces of flexible shaft at bending state

Abstract

The invention provides a method for measuring frictional forces of a flexible shaft at a bending state. The method comprises the following steps: A, bending a flexible shaft to be measured according to an actual installation state, constructing a curve segment formed by the bent flexible shaft to a coordinate system, and forming a flexible shaft curve in the coordinate system; B, measuring the frictional forces and positive pressure of the flexible shaft at a stretching state during push-and-pull and rotation, and obtaining a shaft core rotation friction coefficient mu 1 and a shaft core push-and-pull friction coefficient mu 2 through ratios of the frictional forces to the positive pressure, and according to the flexible shaft curve, obtaining a starting point a and a terminal point b of the flexible shaft curve in the coordinate system; and C, based on a flexible shaft bending rotation frictional force measuring and calculating formula and a flexible shaft bending push-and-pull frictional force measuring and calculating formula, obtaining a flexible shaft bending rotation frictional force and a flexible shaft bending push-and-pull frictional force. The measurement calculation method has the advantages of simple calculation and good comprehensiveness.

Description

technical field [0001] The invention relates to the field of engineering measurement and calculation, in particular to a method for measuring the friction force of a flexible shaft in a bending state. Background technique [0002] The flexible shaft is a transmission shaft whose shaft core is steel wire, the shaft sleeve is made of rubber and other materials and can be bent to transmit power. The flexible shaft is mainly used for transmission in a certain space. In this transmission, the driving device and the driven device are often There is relative motion, or their axes cannot be connected by a straight line. The flexible shaft can bend through a variety of other parts in a zigzag manner, and transmit rotary motion over a long distance. It is more suitable for occasions with continuous vibration, and places with relatively small torque and fast speed. [0003] When the flexible shaft is bent and pushed repeatedly or rotated, the shaft core is in contact with the inner wa...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for measuring the friction force of a flexible shaft in a bending state. The measurement and calculation method overcomes the defects of complicated calculation and strong limitation of the calculation method in the prior art, and has the characteristics of simple calculation and good comprehensiveness.

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