Gas film pressure vector control device for aerostatic bearing

Abstract

The invention provides a gas film pressure vector control device for an aerostatic bearing. The control device comprises a main shaft and a bearing, wherein the bearing is arranged outside the main shaft, an air film is formed in a gap area between the main shaft and the bearing, and throttling holes are uniformly distributed in the bearing; an air chamber coat sleeves outside the bearing, a closed area formed between the air chamber coat and the bearing is the air chamber, and the throttling holes communicate the air film and the air chamber; a flow control valve is arranged on the wall surface of the air chamber coat opposite to the throttling holes in a penetrating mode, the flow control valve is coaxially arranged with the throttling holes, and the valve element of the flow control valve is used for adjusting the opening degree of the throttling holes; an air inlet hole penetrates through the wall surface of the air chamber coat and is externally connected with an air inlet pipe; awireless pressure sensor is arranged in a groove formed in the inner wall of the bearing, the shape, close to one side of the main shaft, of the wireless pressure sensor is consistent with the shapeof the inner wall surface of the bearing, and namely the wireless pressure sensor and the gas film flow field do not interfere with each other; the flow control valve is connected with a wire collecting terminal through a wire harness; the control device is connected with the wire collecting terminal through an anti-interference bus; and the vector control of the gas film pressure of the aerostatic bearing can be realized.

Description

technical field [0001] The invention relates to the field of small-hole throttling gas static pressure bearings, in particular to a gas film pressure vector control device for gas static pressure bearings. Background technique [0002] Gasostatic bearings have the advantages of high speed, high precision, low friction, high and low temperature resistance, and less pollution. They have extensive and important applications in many high-end equipment fields such as ultra-precision machine tools and precision instruments. An important structural feature of gas hydrostatic bearings that is different from other types of bearings is that the pressure gas film is used as the bearing working medium to realize the gas bearing function. The gas static pressure bearing of the small hole throttling type is a more commonly used type of gas static pressure bearing, and its structure is relatively simple. In order to improve the working adaptability of the gas hydrostatic bearing, the cont...

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Problems solved by technology

However, at present, there is a lack of air film pressure control methods for aerostatic bearings at home and abroad, and the existing control methods often achieve air film pressure control by adjusting external factors of the bearing, such as changing the external air supply pressure

Since the direction and magnitude of the external load force of the gas static pressure bearing will change due to the change of the working environment, it is difficult to achieve the best working performance of the gas static pressure bearing by simply adjusting the gas film pressure, and the adaptability and reliability are insufficient

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