WO2018161404A1

WO2018161404A1 - Shockproof air bearing motor spindle

Info

Publication number: WO2018161404A1
Application number: PCT/CN2017/080233
Authority: WO
Inventors: 张翰乾; 单杰; 吴魁; 汤秀清
Original assignee: 广州市昊志机电股份有限公司
Priority date: 2017-03-07
Filing date: 2017-04-12
Publication date: 2018-09-13
Also published as: CN106891020A

Abstract

A shockproof air bearing motor spindle (100) comprises a motor body assembly (5), a spindle core assembly (6), and a lower air bearing bearing assembly (7). The spindle core assembly (6) sleeves in the lower air bearing bearing assembly (7). The lower air bearing bearing assembly (7) comprises at least one wear-resistant bearing plate (71) and a bearing seat (73). A surface of the spindle core assembly (6) is provided with a recess (63). A coating (61) is embedded in the recess (63) to prevent the spindle core assembly (6) from wearing. The bearing seat (73) is fixedly connected to the motor body assembly (5). The at least one wear-resistant bearing plate (71) is fixed on the bearing seat (73) and located between the bearing seat (73) and the spindle core assembly (6). In the shockproof air bearing motor spindle of the invention, the surface of the spindle core assembly is provided with a recess, the coating is embedded in the recess to prevent the spindle core assembly from wearing, and the wear-resistant bearing plate is fixed on the bearing seat and located between the bearing seat and the spindle core assembly, significantly reducing the probability of the spindle jamming.

Description

Impact resistant air floating electric spindle

Technical field

The present invention relates to an electric spindle, and more particularly to an air floating electric spindle.

Background technique

The air-floating spindle has obvious advantages as a spindle supported by a gas bearing. Its fast running speed, smoothness, cleanliness and high temperature resistance make it suitable for adaptability. The main shaft using the gas bearing as the support is also widely used in the field of precision ultra-precision machining due to its high operational precision. Therefore, from the current international research and use situation, vigorously developing the spindle of gas bearing support has become an important breakthrough to improve machining accuracy and productivity. However, it also has its shortcomings when used. For example, the bearing capacity of the main shaft is lower than that of the ball bearing or the hydraulic supporting main shaft, and it is prone to failures such as shaft core scanning and jamming.

Summary of the invention

In order to overcome the deficiencies of the prior art, it is an object of the present invention to provide an impact resistant air floating electric spindle.

The object of the invention is achieved by the following technical solutions:

An impact resistant air floating electric spindle comprises a body assembly, a shaft core assembly and a lower air bearing assembly, the shaft core assembly is sleeved on the lower air bearing assembly, and the lower air bearing assembly comprises at least a wear-resistant bearing plate and a bearing seat, the surface of the shaft core assembly is provided with a sinking groove, and a coating is embedded in the sinking groove to prevent the shaft core assembly from being worn, the bearing seat and the bearing seat The body assembly is fixedly coupled, and the at least one wear bearing plate is fixed to the bearing seat and located between the bearing housing and the shaft core assembly.

Preferably, the coating is a ceramic coating.

Preferably, the ceramic coating is zirconia.

Preferably, the ceramic coating is tungsten carbide.

Preferably, the surface of the sink is sandblasted.

Preferably, the impact resistant air floating electric spindle further comprises a thrust bearing assembly, the at least one wear bearing plate comprises two wear bearing plates, one of the wear bearing plates is fixed to the bearing seat, and the other The wear bearing plate is fixed to the thrust bearing assembly, the shaft core assembly further comprising a spacer plate between the thrust bearing assembly and the bearing housing and the two wear bearing plates conflict.

Preferably, the impact resistant air floating electric spindle further comprises a plurality of fasteners, and the wear bearing plate is fixed to the bearing housing and the thrust bearing assembly by the plurality of fasteners.

Preferably, the fastener is a set screw.

Preferably, the set screw is made of copper.

Preferably, the lower air bearing assembly further includes a bearing shell fixed to the bearing housing and mounted between the shaft core assembly and the lower air bearing assembly.

Compared with the prior art, the surface of the shaft core assembly of the impact resistant air floating electric spindle of the present invention is provided with a sinking groove, the coating is embedded in the sinking groove to prevent the shaft core assembly from being worn, and the wear bearing plate is fixed to the bearing seat and located Between the bearing housing and the shaft core assembly, the probability of a spindle jam failure is significantly reduced.

DRAWINGS

1 is a schematic structural view of an impact resistant air floating electric spindle of the present invention.

2 is an enlarged view of the impact resistant air floating electric spindle A of FIG. 1.

3 is a schematic structural view of a shaft core assembly of the impact resistant air floating electric spindle of FIG. 1.

4 is a schematic structural view of a lower air bearing assembly of the impact resistant air floating electric spindle of FIG. 1.

FIG. 5 is a schematic view showing an internal structure of the impact resistant floating electric spindle of FIG. 1. FIG.

In the figure: 100, impact resistant air floating electric spindle; 1, cylinder assembly; 2, water jacket; 3, upper air bearing assembly; 4, stator; 5, body components; 6, shaft core assembly; 61, coating; 62, isolation plate; 63, sinking groove; 7, lower air bearing assembly; 71, wear bearing plate; 72, bearing bush; 73, bearing seat; 8, thrust bearing assembly;

detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, but not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

It should be noted that when a component is referred to as being "fixed" to another component, it can be directly on the other component or the component can be present. When a component is considered to "connect" another component, it can be directly connected to another component or possibly a central component. When a component is considered to be "set to" another component, it can be placed directly on another component or possibly with a centered component. Used in this article The terms "vertical", "horizontal", "left", "right" and the like are used for illustrative purposes only.

All technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, unless otherwise defined. The terminology used in the description of the present invention is for the purpose of describing particular embodiments and is not intended to limit the invention. The term "and/or" used herein includes any and all combinations of one or more of the associated listed items.

Referring to FIG. 1 to FIG. 5 , an impact resistant air floating electric spindle 100 includes a cylinder assembly 1 , a water jacket 2 , an upper air bearing assembly 3 , a stator 4 , a body assembly 5 , and a shaft core assembly 6 . A lower air bearing assembly 7, a thrust bearing assembly 8 and a plurality of fasteners 9.

The water jacket 2 is made of aluminum. The surface of the core assembly 6 is provided with a sinking groove 63, and the sinking groove 63 is sandblasted and embedded in the coating layer 61. In an embodiment, the coating 61 is a ceramic coating. The ceramic coating is zirconia or tungsten carbide. The core assembly 6 also includes a spacer 62. The lower air bearing assembly 7 includes two wear bearing plates 71, a bearing bush 72 and a bearing seat 73. Each of the fasteners 9 is a set screw which is made of copper.

When the impact resistant floating electric spindle 100 is assembled, one of the wear bearing plates 71 is fixed to the bearing housing 73 by the fasteners 9, and the other wear bearing plate 71 passes the fasteners. 9 is fixed to the thrust bearing assembly 8. The bearing bush 72 is fixedly mounted to the bearing housing 73. The shaft core assembly 6 is sleeved on the upper air bearing assembly 3, the stator 4 and the lower air bearing assembly 7. The shaft core assembly 6, the upper air bearing assembly 3, the stator 4, and the lower air bearing assembly 7 are collectively housed in the body assembly 5. The coating 61 is set There are a plurality of places where the coating 61 is located in the vertical direction between the lower air bearing assembly 7 and the vertical direction surface of the core assembly 6, near the bearing block 73. Another coating 61 is located in a horizontal direction, and the coating 61 is located between the wear bearing plate 71 and the surface of the core assembly 6, and the coating 61 can effectively protect the core assembly 6, The shaft core assembly 6 is prevented from being worn. The spacer 62 is sleeved on the shaft core assembly 6, and the thrust bearing assembly 8 is mounted on one end of the shaft core assembly 6. At this time, the spacer 62 is located between the bearing housing 73 and the thrust bearing assembly 8 and the edge of the spacer 62 is in contact with the two wear bearing plates 71. The water jacket 2 is fixed to the other end of the upper air bearing bearing assembly 3, and the cylinder assembly 1 is mounted to the water jacket 2.

When the impact resistant air floating electric spindle 100 is used, a pressure air mold is formed between the shaft core assembly 6 and the upper air bearing bearing assembly 3 and the lower air bearing bearing assembly 7 by external air supply, and the shaft core assembly 6 is supported. In the suspended state, the stator 4 drives the shaft core assembly 6 to rotate at a high speed. Under the condition of processing load, the shaft core is inclined by force, there is a risk of impact with the bearing, and the wear bearing plate 71 and the bearing bush 72 are installed. This reduces the risk and the coating 61 reduces the wear of the core assembly 6.

Various other changes and modifications may be made by those skilled in the art in light of the above-described technical solutions and concepts, and all such changes and modifications are intended to fall within the scope of the appended claims.

Claims

An impact resistant air floating electric spindle comprises a body assembly, a shaft core assembly and a lower air bearing assembly, the shaft core assembly is sleeved on the lower air bearing assembly, and the lower air bearing assembly comprises at least a wear-resistant bearing plate and a bearing seat, characterized in that: the surface of the shaft core assembly is provided with a sinking groove, a coating is embedded in the sinking groove to prevent the shaft core assembly from being worn, the bearing seat and the bearing seat The body assembly is fixedly coupled, and the at least one wear bearing plate is fixed to the bearing housing and located between the bearing housing and the shaft core assembly.
The impact resistant air floating electric spindle according to claim 1, wherein the coating is a ceramic coating.
The impact resistant air floating electric spindle according to claim 2, wherein the ceramic coating layer is zirconia.
The impact resistant air floating electric spindle according to claim 2, wherein the ceramic coating is tungsten carbide.
The impact resistant air floating electric spindle according to claim 3 or 4, characterized in that the surface of the sinking groove is subjected to sand blasting.
The impact resistant air floating electric spindle according to claim 1, wherein the impact resistant air floating electric spindle further comprises a thrust bearing assembly, and the at least one wear bearing plate comprises two wear bearing plates, one The wear bearing plate is fixed to the bearing seat, and the other wear bearing plate is fixed to the thrust bearing assembly, the shaft core assembly further includes an insulation plate, and the insulation plate is located at the thrust bearing assembly The bearing seats are in contact with the two wear bearing plates.
The impact resistant air floating electric spindle according to claim 6, wherein the impact resistant air floating electric spindle further comprises a plurality of fasteners, and the wear resistant bearing plate passes through the plurality of A fastener is secured to the bearing housing and the thrust bearing assembly.
The impact resistant air floating electric spindle according to claim 7, wherein the fastener is a set screw.
The impact resistant air floating electric spindle according to claim 8, wherein the set screw is made of copper.
The impact resistant air floating electric spindle according to claim 1, wherein said lower air bearing assembly further comprises a bearing bush, said bearing bush being fixed to said bearing housing and mounted to said shaft core assembly and said Between the lower air bearing components.