Search

CN-121993496-A - Air bearing device capable of preventing axial movement

CN121993496ACN 121993496 ACN121993496 ACN 121993496ACN-121993496-A

Abstract

The invention relates to the technical field of air bearing and discloses an air bearing device for preventing axial movement, which comprises an air supply system, a bearing base body and a rotating roller, wherein a permanent magnet pre-tightening structure and an electromagnetic fine-tuning structure are embedded on the inner wall of the bearing base body, the outer surfaces of the permanent magnet pre-tightening structure and the electromagnetic fine-tuning structure are on the same surface with the inner wall of the bearing base body, the permanent magnet pre-tightening structure at least comprises two groups of permanent magnets which are arranged at intervals, the electromagnetic fine-tuning structure at least comprises two groups of electromagnetic modules, the electromagnetic modules are positioned on the outer sides of the corresponding permanent magnets and cling to the corresponding permanent magnets, the magnetic directions of the electromagnetic modules are opposite to the magnetic directions of the permanent magnets.

Inventors

  • LEI ZHONGXING
  • SHI JUN
  • LOU YONGJIANG

Assignees

  • 廊坊麦逊精密机械有限公司

Dates

Publication Date
20260508
Application Date
20260302

Claims (8)

  1. 1. An air bearing device for preventing axial movement is characterized by comprising an air supply system (100), a bearing base body (200) and a rotating roller (300); The inner wall of the bearing matrix (200) is embedded with a permanent magnet pre-tightening structure (220) and an electromagnetic fine-tuning structure (230), and the outer surfaces of the permanent magnet pre-tightening structure (220) and the electromagnetic fine-tuning structure (230) are coplanar with the inner wall of the bearing matrix (200); The permanent magnet pre-tightening structure (220) at least comprises two groups of permanent magnets (221) which are arranged at intervals, the interval part of the permanent magnets is a female centering part (240), and the magnetic pole directions of the two groups of permanent magnets (221) towards the inner wall of the bearing matrix (200) are the same; The electromagnetic fine-tuning structure (230) at least comprises two groups of electromagnetic modules (231), wherein the electromagnetic modules (231) are positioned outside corresponding permanent magnets (221) and cling to the corresponding permanent magnets (221), and the magnetic direction of the electromagnetic modules (231) is opposite to that of the permanent magnets (221); Two magnetic rings (310) are nested on the rotating roller (300) at intervals, the interval part is a male centering part (320), the lengths and the positions of the male centering part (320) and the female centering part (240) correspond to each other, the magnetic rings (310) are attracted to the permanent magnets (221) and repel the electromagnetic modules (231), and the outer surfaces of the magnetic rings (310) are coplanar with the outer wall of the rotating roller (300); The rotating roller (300) is arranged inside the bearing base body (200), and a gap between the rotating roller (300) and the bearing base body (200) is an air film gap (400).
  2. 2. An air bearing device for preventing axial movement according to claim 1, wherein the bearing base body (200) is formed by splicing a plurality of groups of identical bearing blocks (210), and each group of permanent magnets (221) and each group of electromagnetic modules (231) comprise a plurality of single parts, and the single parts and the bearing blocks (210) are arranged in a staggered manner.
  3. 3. An air bearing device for preventing axial play according to claim 2, characterized in that each single part of the permanent magnet (221) and the electromagnetic module (231) is mounted on the corresponding bearing block (210), and one end of each single part is embedded into the adjacent bearing block (210) for assisting accurate splicing of multiple groups of bearing blocks (210).
  4. 4. An air bearing device for preventing axial movement according to claim 2, wherein a connecting air passage (211) is arranged in the bearing block (210), and the connecting air passage (211) penetrates through the inner wall and two ends of the bearing block (210).
  5. 5. An air bearing device for preventing axial movement according to claim 4, wherein the permanent magnet pre-tightening structure (220) and the electromagnetic fine-tuning structure (230) are provided with a receiving air passage (250) matched with the connecting air passage (211) for enabling air to enter the receiving air passage (250) through the connecting air passage (211) and be discharged.
  6. 6. An air bearing device for preventing axial play according to claim 2, characterized in that the air supply system (100) comprises at least an air supply sleeve (110), the air supply sleeve (110) being sleeved outside the bearing base body (200), on which a plurality of air supply ports are arranged for individually supplying air to a plurality of bearing blocks (210).
  7. 7. The air bearing device for preventing axial movement according to claim 6, wherein the air guide cover (120) is mounted at both ends of the air supply sleeve (110), and the air guide cover (120) is provided with a spiral groove (121) for guiding air ejected from the end of the bearing block (210) and air ejected from the outlet of the air film gap (400) to form a spiral air flow recessed toward the center outside the rotating roller (300) through the spiral groove (121).
  8. 8. An air bearing device for preventing axial play according to claim 1, wherein the permanent magnet (221), the electromagnetic module (231) and the magnetic ring (310) are all in halbach array structure.

Description

Air bearing device capable of preventing axial movement Technical Field The invention relates to the technical field of air bearing, in particular to an air bearing device for preventing axial movement. Background The air bearing is used as a non-contact bearing, and supports moving parts by means of an air film formed by air pressure, has the advantages of small friction resistance, small abrasion, high rotation precision, stable operation and the like, is widely applied to high-end fields such as high-speed precision machining, aerospace, precision measurement and the like, and in the operation process of the air bearing, axial float is one of core problems affecting the positioning precision and the operation stability of the air bearing, and refers to the reciprocating offset phenomenon of a rotating part along the axis direction, once the axial float occurs, the machining precision and the measurement precision of equipment can be reduced, the air film is broken, the parts are worn, even equipment faults are caused, and the service life of the air bearing is shortened. The axial movement solution of the air bearing in the prior art mainly focuses on the following aspects of adopting an external bidirectional opposite-top thrust air bearing structure, arranging thrust discs and thrust bearings at two ends or flange surfaces of a rotating part, forming an opposite-top air film through bidirectional air supply to realize axial limit, adopting a small-hole throttling or porous graphite throttling mode to improve the rigidity of the axial air film and reduce the axial movement, adopting an air static pressure pre-tightening structure to realize non-contact pre-tightening through the air pressure difference of a bidirectional thrust surface and improve the axial positioning precision, and adopting an axial zero-clearance mating process to reduce the movement caused by assembly clearance through tightly controlling the parallelism and the flatness of the thrust discs and the thrust bearings, and adopting an air film displacement sensor to combine an active control circuit in high-end equipment to regulate the air supply pressure and the flow in real time to inhibit the axial movement. However, the above-mentioned prior art scheme still has a great deal of defect and deficiency in practical application, is difficult to satisfy the use demand of small-size, miniature high-speed main shaft equiaxial space restricted scene, because traditional outside two-way thrust air bearing structure need additionally arrange thrust disk and thrust bearing at rotating member both ends, occupy a large amount of axial space, and the structure is bulky, can't adapt to small-size, miniature high-speed main shaft equiaxial space limited equipment, and thrust disk's processing, assembly accuracy requirement is extremely high, once assembly deviation is too big, can aggravate axial float on the contrary, has increased the whole weight and the manufacturing cost of device simultaneously. Disclosure of Invention The invention aims to solve the defects in the prior art and provides an air bearing device for preventing axial movement. In order to achieve the above purpose, the present invention adopts the following technical scheme: The air bearing device for preventing axial movement comprises an air supply system, a bearing matrix and a rotating roller, wherein the air supply system is used for providing clean and stable pressure compressed air, providing a power source for forming an air film gap, guaranteeing the core requirement of non-contact operation of the bearing, the bearing matrix is used as an installation carrier and a support base of the whole device, is made of high-strength alloy through precise processing, has good rigidity and dimensional stability, can effectively prevent self deformation from influencing axial positioning precision, the rotating roller is used as a moving part, the surface is polished, air flow disturbance in the air film gap is reduced, and two ends of the air bearing matrix are connected with an external transmission mechanism to realize high-speed stable rotation; The permanent magnet pre-tightening structure and the electromagnetic fine tuning structure are embedded on the inner wall of the bearing matrix and are fixed in an embedded clamping manner, so that the outer surfaces of the permanent magnet pre-tightening structure and the electromagnetic fine tuning structure are completely flush with the inner wall of the bearing matrix, no bulge or recess exists, the uniformity of an interference air film is avoided, and meanwhile, the contact friction with a rotating roller in the rotating process is prevented; The permanent magnet pre-tightening structure at least comprises two groups of permanent magnets which are arranged at intervals, the permanent magnets are preferably made of neodymium iron boron permanent magnet materials, the permanent magnets have high magnetic energy and strong adsorptio