Performance detection device and detection method for air float ball bearing

Abstract

The invention discloses a performance detection device and detection method for an air float ball bearing. A prior air float ball bearing performance detection method cannot analyze bearing performance accurately. According to the invention, a pressure measurement hole faces a bearing ball socket. Male threads of a rotary shaft and a pressure guide rod are connected to two symmetric thread holes of a ball respectively. A measurement head of a displacement sensor is arranged on the top part of the ball. When pressure gas is let into the bearing ball socket, a gas membrane gap is formed betweenthe bearing ball socket and the ball so as to support the ball. A loading air cylinder transmits bearing force to the ball through a force sensor, a bearing support and an open-type air float bearingball socket. Pressure gas is let into the open-type air float bearing ball socket, so that a gas membrane gap is formed between the ball socket and the ball. Through combination with a weft-wise rotary table and a warp-wise rotary plate, pressure detection of gas membrane gaps in different positions of the air float ball bearing is realized. According to the invention, a single pressure measurement hole method is adopted, so that flow field distortion caused by multiple pressure measurement holes is avoided. The displacement sensor measures the displacement variation of the ball directly, so that measurement errors caused by indirection measurement can be avoided.

Description

technical field [0001] The invention belongs to the technical field of precision measurement, and in particular relates to a performance detection device and a detection method of an air bearing ball bearing. Background technique [0002] Air bearings have the advantages of high motion accuracy, low frictional resistance and strong adaptability. They are widely used in precision equipment such as air bearing platforms, precision spindles and gyroscopes. They are ideal supports for ultra-precision measuring instruments. [0003] In order to meet the requirements of the application field for the air bearing ball bearing, it is necessary to analyze the influence of each parameter on the bearing performance, and then complete the parameter optimization design. The performance test of the air-floating ball bearing is mainly to measure the static performance indicators such as the load-carrying capacity of the air-floating ball bearing under different air supply pressures and diff...

AI Technical Summary

Problems solved by technology

[0004] At present, in the performance testing of air-floating ball bearings, the load-bearing capacity loading methods mainly adopt weight type, cylinder type and spring type, etc., among which the connection mode between the loading device and the air-floating ball bearing is rigid connection, which makes it impossible to judge during the test Is the air bearing ball bearing in working condition?

When measuring the air film gap, the displacement sensor is used to measure the relative displacement of a certain plane of the bearing. This method is better for the air film gap measurement of the air bearing plane bearing, but for the air bearing ball bearing, when the selected plane occurs When deflecting and tilting, the relative displacement measured by the sensor is not the change of the air film gap, so accurate performance indicators cannot be obtained

For the measurement of the pressure distribution in the air film gap, the method of opening pressure measuring holes is often used to measure the pressure value of each position of the air film gap, which requires opening pressure measuring holes in multiple directions to reflect the distribution of the air film gap more comprehensively However, when there are many pressure measuring holes, the pressure measuring holes will change the flow field characteristics of the gas film gap and distort the pressure distribution

[0005] Due to the lack of the above detection methods, it is impossible to accurately analyze the performance of the bearing, which brings difficulties to the parameter optimization design of the bearing and related theoretical verification.

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