Air cylinder friction force testing device and method

Abstract

The invention provides an air cylinder friction force testing device and method. The air cylinder friction force testing device comprises an installation platform, a motion transmission part, a connecting assembly, a tested part, a supporting part and an air cylinder pressure control system. Three air cylinders with the same piston acting areas of rod cavities and rodless cavities are selected; the two air cylinders are oppositely arranged; and the rod cavities and rodless cavities of the two air cylinders are communicated with each other and externally connected with an air tank. With a normally-closed quick switch valve, the pressure of the air tank is made to be a constant value based on a corresponding control algorithm; pressures applied to the pistons of the two cylinders by compressed air can be cancelled mutually; and a force measured directly by a tension and pressure sensor is the sum of friction forces of two cylinders. On the basis of the same method, the sums of cylinder friction forces under relative installation of two of the three cylinders are measured three times. And then a ternary linear equation set is solved to calculate friction forces of all cylinders. The air cylinder friction force testing device and method have high measurement precision and universality.

Description

technical field [0001] The invention relates to the field of cylinder friction test, in particular to a cylinder friction test device and method. Background technique [0002] The pneumatic system uses air as the working medium, which has many advantages such as low pollution, low cost, simple structure and good adaptability to the working environment. Therefore, pneumatic technology has been rapidly developed and widely used in contemporary times. The cylinder is the most commonly used actuator in the pneumatic system. The friction force of the cylinder is an important index to evaluate the performance of the cylinder. The friction force of the cylinder will directly affect the positioning accuracy, speed control accuracy and stability of the motion process of the cylinder. [0003] In order to accurately measure the friction force of the cylinder under working conditions, people have designed various experimental devices for testing the friction force of the cylinder. The...

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Problems solved by technology

However, due to the large proportion of the gas pressure acting on the piston included in the resultant force, its error will seriously affect the accuracy of the friction force

In addition, during the movement of the cylinder, due to the volume change of the two chambers of the cylinder, the precision pressure reducing valve cannot respond in time, and the air pressure in each chamber will also change, so the friction force will be affected accordingly

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