WO2020019742A1

WO2020019742A1 - On-line controllable hybrid bearing and control method therefor

Info

Publication number: WO2020019742A1
Application number: PCT/CN2019/079169
Authority: WO
Inventors: 李伟; 叶湘涛
Original assignee: 贵州伟昭科技有限责任公司
Priority date: 2018-07-27
Filing date: 2019-03-22
Publication date: 2020-01-30
Also published as: CN108775333A; CN108775333B

Abstract

Disclosed is an on-line controllable hybrid bearing, comprising a main shaft (7), a radial adjustment ring (1), a shaft sleeve (2) and a bearing bush (3). The shaft sleeve (2) is installed on the periphery of the main shaft (7) in a matching manner, the radial adjustment ring (1) is installed on the periphery of the shaft sleeve (2) in a matching manner, and a rotary cavity (4) is formed on the inner side of the radial adjustment ring (1). A bearing bush mounting groove is formed in the shaft sleeve (2). The bearing bush (3) is mounted in the bearing bush mounting groove and is tangent to a sidewall of the rotary cavity (4). The width of the rotary cavity (4) gradually decreases in the counterclockwise direction. Further disclosed is a control method for the on-line controllable hybrid bearing. The on-line controllable hybrid bearing and the control method therefor can solve the problem that the existing hybrid bearing cannot normally work due to the fact that the hybrid bearing cannot adjust the clearance between a journal and the bearing bush (3) at different rotation speeds of the main shaft (7), online control is achieved, and the on-line controllable hybrid bearing and the control method therefor are capable of adapting to different working conditions.

Description

Dynamic and static pressure bearing capable of being controlled online and control method thereof

Technical field

The invention relates to the technical field of mechanical transmission fluid bearings, in particular to a dynamic and static pressure bearing which can be controlled online and a control method thereof.

Background technique

Dynamic and static pressure bearings are sliding bearings that can work under both hydrostatic and hydrodynamic lubrication. The dynamic speed change of dynamic and static pressure bearings will affect the oil film temperature and oil film pressure. The change in oil temperature will cause the viscosity of the oil to change. Among them, the gap between the journal of the main shaft and the bearing shell is very important for the formation of the oil film under dynamic pressure. , And changes with the operating conditions. Due to the different types of workpieces and the amount of grinding in actual production, it is required that the gap between the journal and the bush can adapt to a large change in the spindle speed, and to ensure the accuracy and stability of the spindle rotation. However, the current journal and The bearing bush clearance is fixed at the factory. Such dynamic and static pressure bearings can only have good dynamic pressure performance in a small speed range. The change of the spindle speed will change the oil film formation conditions, resulting in bearing failure. Normal operation, that is, the current dynamic and static pressure bearings are difficult to adapt to different working conditions.

Therefore, it is necessary to design a dynamic and static pressure bearing that can adjust the gap between the journal and the bearing shell (the size of the oil gap).

Summary of the Invention

The object of the present invention is to provide a dynamic and static pressure bearing capable of controlling the size of an oil gap online and a control method thereof, so as to solve the existing dynamic and static pressure bearings that can form a stable and reliable dynamic pressure oil film in a large speed change.

In order to achieve the above object, the technical solution of the present invention is to provide an online-controllable dynamic and static pressure bearing. The online-controllable dynamic and static pressure bearing includes a main shaft, a radial adjusting ring, a shaft sleeve and a bearing bush. The main shaft is embedded in A shaft sleeve, which is embedded in a radial adjustment ring, a rotating cavity is provided on the inner side of the radial adjustment ring, a bearing bush mounting groove is provided on the sleeve, and the bearing bush is installed in the bearing bush mounting groove and The inner wall of the rotating cavity is tangent, and the height of the rotating cavity gradually decreases in a counterclockwise direction.

As a preferred technical solution, an oil cavity is formed between the inner arc surface of the bearing pad and the main shaft, and the outer arc surface of the bearing pad is in contact with the inner side wall of the rotating cavity.

As a preferred technical solution, an oil inlet hole is provided on the bearing pad, and the oil inlet hole is in communication with an oil cavity.

As a preferred technical solution, an inner wall of the rotating cavity is an Archimedean spiral surface.

As a preferred technical solution, the radial adjustment ring is connected to a rotating block in a rotating oil cylinder through a connecting pin.

As a preferred technical solution, the shaft sleeve is connected to the rotary oil cylinder through a positioning pin.

As a preferred technical solution, the bearing pad mounting grooves are uniformly distributed in the circumference of the shaft sleeve, and the bearing pad mounting grooves correspond to the bearing pads, the bearing pads, and the rotating cavity one to one.

Provided is a method for controlling a hydrostatic bearing that can be controlled online. The control method includes: a rotating block in a rotating oil cylinder drives a radial adjustment ring to rotate at a rated speed, and a main shaft rotates under power driving; The lubricating oil forms an oil film under the condition of relative movement; when the radial adjustment ring is rotated clockwise by the rotating oil cylinder, the contact point between the bearing pad and the rotating cavity moves counterclockwise, because the height of the rotating cavity follows the counterclockwise direction The distance between the bearing pad and the main shaft gradually decreases, and the thickness of the oil film decreases accordingly. When the radial adjustment ring rotates counterclockwise under the driving of the rotating cylinder, the contact point between the bearing pad and the rotating cavity moves clockwise. The width of the rotating cavity gradually increases in a clockwise direction, the gap between the bearing pad and the main shaft becomes larger, and the thickness of the oil film becomes correspondingly larger.

The invention has the following advantages:

(1) An on-line controllable dynamic and static pressure bearing provided by the present invention can realize the on-line control of the gap between the bearing pad and the main shaft, and the on-line adjustment of the oil film thickness and oil film pressure;

(2) The on-line controllable dynamic and static pressure bearing provided by the present invention can be applied to working conditions with different spindle speeds and grinding amounts, and has strong applicability;

(3) The on-line controllable dynamic and static pressure bearing provided by the present invention has the characteristics of high life, high accuracy and high stability;

(4) The dynamic and static pressure bearings provided by the present invention can achieve the technological requirements of online adjustment of the spindle and bearing gap after changing the oil film viscosity due to changes in speed or temperature;

(5) The dynamic and static pressure bearings provided by the present invention can ensure that the radial position of the main shaft remains unchanged when the oil film thickness is adjusted online.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a radial sectional view of an on-line controllable dynamic and static pressure bearing provided by the present invention.

FIG. 2 is an axial sectional view of an on-line controllable dynamic and static pressure bearing provided by the present invention.

In the picture: 1-radial adjustment ring, 2-shaft sleeve, 3-bearing, 4-rotor cavity, 5-oil inlet, 6-oil cavity, 7-spindle, 8-rotating cylinder, 9-position pin, 10 -Swivel block, 11-connecting pin.

detailed description

The following examples are used to illustrate the present invention, but not to limit the scope of the present invention.

Example 1

Referring to FIG. 1, this embodiment provides an on-line controllable dynamic and static pressure bearing, which includes a main shaft 7, a radial adjustment ring 1, a shaft sleeve 2 and a bearing pad 3. The main shaft 7 is embedded in the shaft sleeve 2, and the shaft sleeve 2 is embedded in Radial adjusting ring 1, a rotating cavity 4 is provided on the inner side of the radial adjusting ring 1, a bearing pad mounting groove is provided on the shaft sleeve 2, the bearing pad 3 is installed in the bearing pad mounting groove and is tangent to the inner wall of the rotating cavity 4, this implementation The number of bearing pads 3 in the example includes, but is not limited to four.

Further, referring to FIG. 2, the shaft sleeve 2 is installed on the equipment frame, the radial adjustment ring 1 is connected to the rotary block 10 in the rotary oil cylinder 8 through the connecting pin 11, and the shaft sleeve 2 is connected to the rotary oil cylinder 8 through the positioning pin 9. As a result, the radial adjustment ring 1 can be rotated with the rotation of the rotary block 10 in the rotary cylinder 8.

Further, the width of the rotating cavity 4 gradually decreases in a counterclockwise direction. The inner wall of the rotating cavity 4 is an Archimedean spiral surface. The Archimedean spiral surface is composed of numerous Archimedean spirals. The Archimedes spiral is also called "constant velocity spiral", that is, when a point P moves at a constant rate along a moving ray OP, the ray rotates around point O at a constant angular velocity. The trajectory of point P is called For Archimedes spiral, this design can ensure that the position of the main shaft 7 does not change while the gap between the bearing shell 3 and the main shaft 7 is changed, and the adjustment stability is improved.

Further, an oil cavity 6 is formed between the inner arc surface of the bearing shell 3 and the main shaft 7. An oil inlet hole 5 is provided on the bearing shell 3, and the oil inlet hole 5 communicates with the oil cavity 6, for ensuring the amount of lubricant in the bearing. The outer arc surface of 3 is in contact with the inner side wall of the rotating cavity 4, so that the bearing pad 3 can move with the rotation of the radial adjustment ring 1, thereby reducing or increasing the gap between the bearing pad 3 and the main shaft 7.

Further, the bearing shoe mounting grooves are evenly distributed in the circumference of the shaft sleeve 2, and the bearing shoe mounting grooves correspond to the bearing shoe 3, the bearing shoe 3 and the rotating cavity 4, and are arranged symmetrically and uniformly to ensure uniform distribution of oil film pressure and thickness.

This embodiment provides a method for controlling a dynamic and static pressure bearing that can be controlled online, including:

The rotating block 10 in the rotating oil cylinder 8 drives the radial adjustment ring 1 to rotate at the rated speed, and the main shaft 7 rotates under power driving; the lubricating oil between the bearing pad 3 and the main shaft 7 forms an oil film under the condition of relative movement; when the radial adjustment When the ring 1 is rotated clockwise by the rotary cylinder 8, the contact point between the bearing pad 3 and the rotating cavity 4 moves counterclockwise. As the width of the rotating cavity 4 gradually decreases in the counterclockwise direction, the bearing pad 3 and the main shaft 7 The gap between them becomes smaller, and the thickness of the oil film becomes smaller accordingly. When the radial adjustment ring 1 is rotated counterclockwise by the rotary cylinder 8, the contact point between the bearing pad 3 and the rotation chamber 4 moves clockwise. The width of the bearing gradually increases in a clockwise direction, the gap between the bearing pad 3 and the main shaft 7 becomes larger, and the thickness of the oil film becomes correspondingly larger. At the same time, the oil film pressure also changes with the change of the gap between the bearing pad 3 and the main shaft 7, which truly achieves online control and achieves high precision, high stability and long life of dynamic and static pressure bearings.

Although the present invention has been described in detail with the general description and specific embodiments, it is obvious to those skilled in the art that some modifications or improvements can be made based on the present invention. Therefore, these modifications or improvements made without departing from the spirit of the present invention belong to the scope of protection of the present invention.

Claims

An on-line controllable dynamic and static pressure bearing is characterized in that the on-line controllable dynamic and static pressure bearing comprises a main shaft (7), a radial adjustment ring (1), a shaft sleeve (2) and a bearing shell (3). The main shaft (7) is embedded in a shaft sleeve (2), the shaft sleeve (2) is embedded in a radial adjustment ring (1), and a rotating cavity (4) is provided on the inner side of the radial adjustment ring (1), The shaft sleeve (2) is provided with a bearing pad mounting groove, the bearing pad (3) is installed in the bearing pad mounting groove and is tangent to the inner wall of the rotating cavity (4), and the width of the rotating cavity (4) is along the Gradually decrease counterclockwise.
The online-controllable dynamic and static pressure bearing according to claim 1, characterized in that an oil chamber (6) is formed between the inner arc surface of the bearing pad (3) and the main shaft (7), and an outer arc of the bearing pad (3) is formed. The surface is in contact with the inner wall of the rotating cavity (4).
The online-controllable dynamic and static pressure bearing according to claim 2, characterized in that the bearing shell (3) is provided with an oil inlet hole (5), and the oil inlet hole (5) is in communication with the oil cavity (6) .
The on-line controllable dynamic and static pressure bearing according to claim 1, wherein the inner wall of the rotating cavity (4) is an Archimedean spiral surface.
The on-line controllable dynamic and static pressure bearing according to claim 1, characterized in that the radial adjustment ring (1) is connected to the rotating block (10) in the rotating oil cylinder (8) through a connecting pin (11).
The on-line controllable dynamic and static pressure bearing according to claim 1, wherein the shaft sleeve (2) is connected to the rotary oil cylinder (8) through a positioning pin (9).
The online-controllable dynamic and static pressure bearing according to claim 1, characterized in that the bearing pad mounting grooves are evenly distributed within the circumference of the shaft sleeve (2), and the bearing pad mounting grooves and the bearing pads (3) and The bearing pads (3) correspond to the rotating cavity (4) one-to-one.
The control method for an on-line controllable dynamic and static pressure bearing according to any one of claims 1-7, wherein the control method comprises:

The rotating block (10) in the rotating cylinder (8), the rotating block (10) drives the radial adjustment ring (1) to rotate at a rated speed within a certain range, and the main shaft (7) is driven by power; the bearing pad (3) The lubricating oil between the shaft and the main shaft (7) forms a dynamic pressure oil film under the condition of relative movement; when the radial adjustment ring (1) rotates clockwise under the drive of the rotating oil cylinder (8), the bearing pad (3) and the rotating cavity (4) The contact point moves counterclockwise. As the width of the rotating cavity (4) gradually decreases in the counterclockwise direction, the gap between the bearing pad (3) and the main shaft (7) becomes smaller, and the thickness of the oil film becomes smaller accordingly. ; When the radial adjustment ring (1) is rotated counterclockwise by the rotating oil cylinder (8), the contact point between the bearing shell (3) and the rotating cavity (4) moves clockwise, due to the width of the rotating cavity (4) Increasing gradually in a clockwise direction, the gap between the bearing pad (3) and the main shaft (7) becomes larger, and the thickness of the oil film becomes correspondingly larger.