CN209969579U

CN209969579U - Composite air floatation main shaft

Info

Publication number: CN209969579U
Application number: CN201920785646.3U
Authority: CN
Inventors: 杨娟
Original assignee: Guangzhou Benson Consulting Service Co Ltd
Current assignee: Guangzhou Benson Consulting Service Co Ltd
Priority date: 2019-05-29
Filing date: 2019-05-29
Publication date: 2020-01-21
Anticipated expiration: 2029-05-29

Abstract

The utility model provides a compound air supporting main shaft, include: the rotary shaft is connected with the rear end shell through bolts, the rotary shaft penetrates between the front end shell and the rear end shell, an air bearing is installed on the front end portion of the rotary shaft, the thrust bearing is nested in the middle of the rotary shaft, the vacuum adsorption bearing is nested in the rotary shaft and located between the air bearing and the thrust bearing, and the rotary motor is installed at the tail portion of the rotary shaft. The composite air-floatation main shaft is simple in structure and ingenious in design, can keep a certain moving shrinkage amount of the rotating shaft in the axial direction, can rotate without friction, can lock the rotating shaft by introducing negative pressure into the vacuum adsorption bearing, and achieves the purpose of locking, so that the rotating shaft can be positioned and stopped at high precision.

Description

Composite air floatation main shaft

Technical Field

The utility model relates to a motion platform, concretely relates to compound air supporting main shaft.

Background

The traditional machine tool spindle mainly comprises a spindle taking a rolling bearing as a supporting element, a magnetic suspension spindle, a hydrostatic spindle and a aerostatic spindle. The main shaft using the rolling bearing as a supporting element is the most common main shaft, and has the advantages of low manufacturing cost, high rigidity and bearing capacity, large abrasion, short service life and low precision. The magnetic suspension spindle has high precision, small abrasion, high rigidity and high bearing capacity, but the magnetic suspension spindle has high manufacturing cost and difficult control, so the magnetic suspension spindle is less in application. In contrast, the hydrostatic spindle and the aerostatic spindle are moderate in manufacturing cost, high in precision and high in speed. However, the hydrostatic bearing spindle generates heat more seriously due to the excessive viscosity of the hydraulic oil, so that a cooling mechanism and a hydraulic station are required to be arranged, the operation cost is high, and the aerostatic spindle is a preferable choice in terms of economy, manufacturing and using feasibility.

The gas static pressure main shaft adopts a frameless torque motor to drive the rotor to rotate, so that the frameless torque motor of the gas static pressure main shaft is integrated with the main shaft structurally, and the traditional intermediate links such as gear transmission and belt transmission are not needed in transmission, so that the machine tool main shaft system realizes zero-clearance transmission. However, when the spindle needs to be stopped, the existing aerostatic spindle is generally not provided with a brake device, and the spindle stops rotating by means of the stopping rotation of the motor, so that the spindle cannot be stopped at a precise fixed point.

SUMMERY OF THE UTILITY MODEL

The utility model provides a not enough to prior art, the utility model provides a compound air supporting main shaft can realize that the high-accuracy location of pivot stops.

In order to realize the above technical scheme, the utility model provides a compound air supporting main shaft, include: the front end shell, the rotating shaft and the rear end shell are connected through bolts, the rotating shaft penetrates between the front end shell and the rear end shell, an air bearing is installed on the front end portion of the rotating shaft, the thrust bearing is nested in the middle of the rotating shaft, the vacuum adsorption bearing is nested in the rotating shaft and located between the air bearing and the thrust bearing, and the rotating motor is installed at the tail portion of the rotating shaft.

In the technical scheme, the air bearing is matched with the rotating shaft to form a radial bearing of the air-floating main shaft, when a certain equivalent amount of gas is introduced into the air bearing and the thrust bearing, the rotating shaft can have a certain moving shrinkage amount in the axial direction, and the rotating shaft can be driven to rotate at a high speed by the driving of the rotating motor. When the rotating shaft is required to stop, the rotating motor stops rotating, and meanwhile the vacuum adsorption bearing is introduced with negative pressure to lock the rotating shaft, so that the purpose of a band-type brake is achieved, and the high-precision positioning stop of the rotating shaft can be realized.

Preferably, the middle part of the rotating shaft is provided with a thrust bearing shaft sleeve, the thrust bearing shaft sleeve is arranged at the contact position of the butt joint surface of the front end shell and the rear end shell, and the thrust bearing is arranged in the thrust bearing shaft sleeve so as to ensure the stable operation of the thrust bearing.

Preferably, the rotating electrical machine comprises a rotor and a stator, the rotor is fixed on the rotating shaft, the stator is fixed inside the rear end shell and wraps the rotor, and the rotor is rotated and driven to rotate by matching between the stator and the rotor.

Preferably, the circle grating subassembly is installed to the rear end of rotating electrical machines, the circle grating subassembly includes circle grating and reading head, the circle grating is fixed in the pivot and is located the rear end of rotating electrical machines active cell, and the reading head is installed on the rear end casing and just to the circle grating setting, through the cooperation between reading head and the circle grating, can realize the accurate count to the pivot, is convenient for to rotating electrical machines's accurate control.

The utility model provides a pair of compound air supporting main shaft's beneficial effect lies in: the composite air-floatation main shaft is simple in structure and ingenious in design, can keep a certain moving shrinkage amount of the rotating shaft in the axial direction, can rotate without friction, can lock the rotating shaft by introducing negative pressure into the vacuum adsorption bearing, and achieves the purpose of locking, so that the rotating shaft can be positioned and stopped at high precision.

Drawings

Fig. 1 is a front view of the present invention.

Fig. 2 is a cross-sectional view of the present invention.

In the figure: 1. a front end housing; 2. a rotating shaft; 3. a thrust bearing; 4. a thrust bearing sleeve; 5. a rotating electric machine; 6. an air bearing; 7. vacuum adsorption bearing; 8. a rear end housing; 9. a circular grating assembly.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by a person skilled in the art without any inventive step are within the scope of the present invention.

Example (b): a composite air-floating main shaft.

Referring to fig. 1 and 2, a composite air spindle includes: the front end shell 1, the rotating shaft 2 and the rear end shell 8 are connected through bolts, the rotating shaft 2 penetrates between the front end shell 1 and the rear end shell 8, the front end part of the rotating shaft 2 is provided with an air bearing 6, the air bearing 6 is embedded on the rotating shaft 2 and is positioned in the front end shell 1, the middle part of the rotating shaft 2 is provided with a thrust bearing shaft sleeve 4, the thrust bearing shaft sleeve 4 is arranged at the butt joint surface contact part of the front end shell 1 and the rear end shell 8, the thrust bearing 3 is arranged in the thrust bearing shaft sleeve 4 and is embedded in the middle part of the rotating shaft 2 so as to ensure that the thrust bearing 3 runs stably, the vacuum adsorption bearing 7 is embedded on the rotating shaft 2 and is positioned between the air bearing 6 and the thrust bearing 3, the rotating motor 5 is arranged at the tail part of the rotating shaft 2, the rotating motor 5 comprises a rotor and a stator, the rotor is fixed on the rotating, the stator is fixed inside 8 rear end casings and wraps up the active cell, and through the cooperation between stator and the active cell, it is rotatory to realize the rotation of active cell and drive pivot 2, and circle grating subassembly 9 is installed to the rear end of rotating electrical machines 5, circle grating subassembly 9 includes circle grating and reading head, circle grating is fixed on pivot 2 and is located the rear end of 5 active cells of rotating electrical machines, and the reading head is installed on rear end casing 8 and just to the circle grating setting, through the cooperation between reading head and the circle grating, can realize the accurate count to 2 of counter shafts, is convenient for to the accurate control of rotating electrical machines 5.

In this embodiment, the air bearing 6 cooperates with the rotating shaft 2 to form a radial bearing of the air-floating spindle, when a certain equivalent amount of gas is introduced into the air bearing 6 and the thrust bearing 3, the rotating shaft 2 can have a certain moving shrinkage in the axial direction, and the rotating shaft 2 can be driven to rotate at a high speed by the driving of the rotating motor 5. When the rotating shaft 2 is required to stop, the rotating motor 5 stops rotating, and meanwhile the vacuum adsorption bearing 7 is filled with negative pressure to lock the rotating shaft 2, so that the purpose of locking is achieved, and the high-precision positioning stop of the rotating shaft 2 can be realized.

This compound air supporting main shaft simple structure, design benefit both can realize that pivot 2 keeps certain removal shrinkage in the axial, can realize the frictionless rotation of pivot 2 again to can be through letting in the negative pressure in to vacuum adsorption bearing 7, with pivot 2 lock, realize that the high-accuracy location of pivot 2 stops.

The above description is a preferred embodiment of the present invention, but the present invention should not be limited to the disclosure of the embodiment and the accompanying drawings, and therefore, all equivalents and modifications that can be accomplished without departing from the spirit of the present invention are within the protection scope of the present invention.

Claims

1. A composite air bearing spindle comprising: front end casing, pivot and rear end casing, through bolted connection between front end casing and the rear end casing, the pivot runs through between front end casing and rear end casing, its characterized in that: the front end part of the rotating shaft is provided with an air bearing, the thrust bearing is nested in the middle of the rotating shaft, the vacuum adsorption bearing is nested in the rotating shaft and is positioned between the air bearing and the thrust bearing, and the rotating motor is arranged at the tail part of the rotating shaft.

2. The composite air-bearing spindle of claim 1, wherein: the middle part of the rotating shaft is provided with a thrust bearing shaft sleeve, the thrust bearing shaft sleeve is arranged at the contact position of the butt joint surface of the front end shell and the rear end shell, and the thrust bearing is arranged in the thrust bearing shaft sleeve.

3. The composite air-bearing spindle of claim 1, wherein: the rotating motor comprises a rotor and a stator, the rotor is fixed on the rotating shaft, and the stator is fixed inside the rear end shell and wraps the rotor.

4. The composite air-bearing spindle according to claim 3, wherein: the utility model discloses a rotary electric machine, including the rotary electric machine, the rear end of rotary electric machine is installed the circle grating subassembly, the circle grating subassembly includes circle grating and reading head, the circle grating is fixed in the pivot and is located the rear end of rotary electric machine active cell, and the reading head is installed on the rear end casing and just to the setting of circle grating.