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Electric main shaft supported by hydrostatic integrated gas bearing

A gas bearing, dynamic and static pressure technology, applied in the direction of large fixed members, metal processing machinery parts, maintenance and safety accessories, etc., can solve the problems of complex structure of electric spindle, continuous gas supply, etc., and achieve low friction and gas-saving supply , Strengthen the effect of supporting effect

Inactive Publication Date: 2014-06-11
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to solve the defects in the prior art, to provide an electric spindle supported by a dynamic and static pressure integrated gas bearing, to simplify the structure of the electric spindle support bearing, and to improve The working speed of the electric spindle, while utilizing the respective characteristics of the gas dynamic and static pressure bearings, overcomes the shortcomings of the traditional gas bearing electric spindle with complex structure and the need for continuous gas supply from an external source, reducing costs and simplifying the structure

Method used

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  • Electric main shaft supported by hydrostatic integrated gas bearing
  • Electric main shaft supported by hydrostatic integrated gas bearing
  • Electric main shaft supported by hydrostatic integrated gas bearing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] see figure 1 , the electric spindle supported by the gas bearing integrated with dynamic and static pressure includes rotating shaft 1, front radial dynamic and static pressure integrated gas bearing 2, front thrust gas bearing 11, front air hole 12, front exhaust hole 4, thrust plate 9, rear Thrust gas bearing 13, fastening bolt 14, housing 15, motor rotor 16, motor stator 17, water inlet 18, water outlet 19, cooling water tank 20, rear radial dynamic and static pressure integrated gas bearing 21, sealing ring 23, rear inlet Air hole 24, rear exhaust hole 22, rear end cover 25. It is characterized in that: the motor rotor 16 of the electric spindle is nested on the rotating shaft 1 and rotates together with the rotating shaft 1; the motor stator 17 is fastened and nested on the housing 15; the front and rear ends of the rotating shaft 1 are separated by the front The radial dynamic and static pressure integrated gas bearing 2 and the rear radial dynamic and static pre...

Embodiment 2

[0022] see figure 2 , 3 , 4, 5, the present embodiment is basically the same as Embodiment 1, and the special features are as follows:

[0023] The electric spindle supported by the dynamic and static pressure integrated gas bearing is characterized in that: the front thrust gas bearing 11 and the rear radial dynamic and static pressure integrated gas bearing 21 are respectively processed with air intake holes 12 and 24 to assist the formation of the gas bearing The air film will float the rotating shaft; the part of the rotating shaft 1 that cooperates with the front radial dynamic and static pressure integrated gas bearing 2 and the rear radial dynamic and static pressure integrated gas bearing 21 is processed with spiral grooves 3 and 26 to strengthen the dynamic pressure bearing. The dynamic pressure effect can make the dynamic pressure effect more significant under high-speed working conditions; the front radial dynamic and static pressure integrated gas bearing 2 and t...

Embodiment 3

[0025] see figure 1 , the second embodiment is basically the same, and the special features are as follows:

[0026] The front radial dynamic and static pressure integrated gas bearing 2 is equipped with a plug 6 at the outer end of the processing gas path to prevent air leakage and affect the formation of the gas film; the front air inlet 12 and the rear air inlet 24 are respectively connected to the front and rear radial dynamic Sealing rings 7, 23 are installed at the joints of the pressure-integrated gas bearings 2, 21 to ensure the smoothness and stability of the whole gas circulation.

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Abstract

The invention discloses an electric main shaft supported by a hydrostatic integrated gas bearing. The electric main shaft comprises a revolving shaft, a front radial hydrostatic integrated gas bearing, a front thrust gas bearing, a thrust color, a back thrust gas bearing, a fastening bolt, a shell, a motor rotor, a motor stator, a back radial hydrostatic integrated gas bearing and a back end cover. The electric main shaft is supported by the hydrostatic integrated gas bearing, the hydrostatic gas bearing of the bearing is supplied with air for a certain period of time till the rotor can float, the hydrodynamic effect of a dynamic pressure gas bearing is utilized by increasing the rotating speed to support a load, so that the air supply time of a static pressure gas is shortened on the basis of not changing the bearing structure, the cost is lowered, the hydrodynamic effect of the hydrodynamic gas bearing is used fully for supporting the load, the carrying force and the stability are improved, and the electric main shaft can keep working normally.

Description

technical field [0001] The invention relates to a spindle unit applied to a numerical control machine tool in the field of electromechanical engineering, in particular to an electric spindle supported by a dynamic and static pressure integrated gas bearing. Background technique [0002] The high-speed electric spindle used in CNC machine tools is a functional component that integrates the tool spindle with the drive motor to realize the integration of motor and spindle functions. With the advancement of processing technology, processing machine tools have higher and higher requirements for the speed and precision of the electric spindle unit. However, rolling bearings have high friction and wear, low precision and short life compared to other bearings, so they are gradually no longer suitable for high-speed working conditions; the related technology of magnetic suspension bearings is not yet mature, expensive, complex control structure, and easy to cause electromagnetic poll...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23B19/02B23Q11/12
CPCB23Q1/70B23Q11/12B23Q11/121
Inventor 董玛莉李松生黄小泵
Owner SHANGHAI UNIV
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