Self-lubricating self-sealing graphite gas-floatation electrostatic pressure spindle structure

Abstract

The invention relates to a self-lubricating self-sealing graphite gas-floatation electrostatic pressure spindle structure. The spindle structure comprises a spindle, a thrust collar arranged on the end part of the spindle, a sleeve arranged outside the spindle in a sleeving manner, a motor stator and a motor rotor, wherein a front bearing bush and a rear bearing bush which are made of a porous material are arranged between the sleeve and the spindle; the front bearing bush is arranged on the front end of an inner hole of the sleeve; the rear bearing bush is arranged on the rear end of the inner hole of the sleeve; a front end cover and a rear end cover are respectively arranged on both ends of the spindle. Because a porous bearing which has good radial rigidity and thrust rigidity is adopted and a throttler and the bearing are integrated into a whole, the cost of the throttler is saved; the front bearing bush and the rear bearing bush are made of the porous graphite material, and because graphite is a solid lubricant per se and a gas membrane is a gas lubricant per se while floating, the spindle does not easily undergo bearing shoe grinding and has good self-lubricating property when the rotating stability is relatively poor; the spindle structure disclosed by the invention also has the advantages of simple structure, relatively stable sealing property, difficulty in inclination of the spindle, stable swinging operation and the like.

Description

technical field [0001] The invention belongs to the field of manufacturing, and relates to a porous gas static pressure spindle structure suitable for precision and ultra-precision processing technology, in particular to a self-lubricating and self-sealing graphite air-floating static pressure spindle structure. Background technique [0002] Gas hydrostatic bearing is a kind of hydrostatic bearing, which is a sliding bearing that uses a pressure pump to forcibly pump pressure lubricant into the tiny gap between the bearing and the shaft. The structure and working principle of gas hydrostatic bearings are similar to those of liquid sliding bearings, except that gas (mostly air) is used as the lubricating medium. When the external compressed gas enters the bearing gap through the restrictor, a layer of lubricating gas film with a certain bearing capacity and rigidity will be formed in the gap, and the shaft will float in the bearing by the lubricating support of the gas film. ...

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Problems solved by technology

[0005] In view of the defects in the above-mentioned prior art, the purpose of the present invention is to provide a self-lubricating and self-sealing graphite air-floating hydrostatic spindle structure, which solves the problem of complex structure, unstable sealing performance and easy tilting of the spindle in the prior art. And other issues

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