High-precision air floating rotary device

Abstract

The utility model relates to the field of precision machining technology, concretely to a high accuracy air -float rotating device, include: the thrust air -float bearing, the surface of thrust air -float bearing is opened with circular hollow slot, the inside of circular hollow slot is inserted with the central shaft, the middle part outside of central shaft is equipped with radial air -float bearing, the outside of radial air -float bearing is provided with radial bearing pedestal, the bottom surface of radial bearing pedestal is opened with conical hollow slot, the outside of thrust air -float bearing is provided with thrust bearing pedestal, the top surface of thrust bearing pedestal is opened with double -decked invagination groove. The utility model adopts the porous pottery as the ventilation medium of air -float bearing, and airflow is stable, and the air outlet is even, can significantly reduce the radial runout and end surface runout of air -float bearing, adopts the radial air -float bearing of conical, can prevent radial runout of main shaft, can prevent axial runout of main shaft, plays double -effect, simple structure can effectively reduce assembly error.

Description

Technical Field

[0001] This utility model relates to the field of precision machining technology, specifically a high-precision air-float rotation device. Background Technology

[0002] The spindle is the core component of precision machining equipment, and its accuracy largely determines the machining accuracy. Currently, existing spindles mainly use ball bearings, which limit both axial and radial accuracy. Some manufacturers use small-hole throttling air bearings, which improves accuracy but limits spindle rigidity and makes it prone to air hammer. Currently, some manufacturers are developing and producing porous air-bearing spindles, using porous graphite as the air-permeable medium, which has achieved good results. However, porous graphite has poor hardness and is easily scratched, making it difficult to achieve good spindle rigidity.

[0003] Therefore, in order to solve the above problems, a high-precision air-float rotation device is proposed. Utility Model Content

[0004] The purpose of this utility model is to provide a high-precision air-floating rotation device to solve the problem mentioned in the background art that some manufacturers have developed and produced porous air-floating spindles, using porous graphite as the air-permeable medium, which has achieved good results. However, porous graphite has poor hardness and is easily scratched, making it difficult to achieve good spindle rigidity.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a high-precision air-bearing rotation device, comprising: a thrust air-bearing bearing;

[0006] The surface of the thrust air bearing has a circular hollow groove, a central shaft is inserted into the inner side of the circular hollow groove, a radial air bearing is sleeved on the outer side of the middle part of the central shaft, a radial bearing base is provided on the outer side of the radial air bearing, a conical hollow groove is provided on the bottom surface of the radial bearing base, a thrust bearing base is provided on the outer side of the thrust air bearing, and a double-layer recessed groove is provided on the top surface of the thrust bearing base.

[0007] Preferably, the thrust air bearing is embedded in the inner side of the double-layer recessed groove, and the thrust air bearing is fixedly connected to the inner wall of the double-layer recessed groove by epoxy resin adhesive.

[0008] Preferably, the thrust bearing base is cylindrical in shape.

[0009] Preferably, the upper end of the radial air bearing is embedded in the inner side of the conical hollow groove, and the radial air bearing is fixedly connected to the inner wall of the conical hollow groove by epoxy resin adhesive.

[0010] Preferably, the central shaft is conical in the middle and cylindrical at the top and bottom, with the inclined surface of the cone engaging with the radial air bearing and the flat surface of the cone engaging with the thrust air bearing.

[0011] Preferably, the thrust bearing base is fixedly connected to the radial bearing base by bolts.

[0012] Compared with the prior art, the beneficial effects of this utility model are: This utility model uses porous ceramic as the air medium of the air bearing, which ensures stable airflow and uniform air output, and can significantly reduce the radial runout and end face runout of the air bearing; the use of a conical radial air bearing can prevent both radial runout and axial runout of the spindle, achieving a dual effect, with a simple structure and effectively reducing assembly errors.

[0013] This invention comprises a radial air bearing, a radial bearing base, a thrust air bearing, a thrust bearing base, and a central shaft. The upper end of the radial air bearing is embedded in a conical hollow groove on the bottom surface of the radial bearing base, and the upper end of the radial air bearing is fixed to the inner side of the conical hollow groove with epoxy resin. This radial air bearing can prevent both radial and axial runout of the spindle, achieving a dual effect. The thrust air bearing is embedded in a double-layer recessed groove on the top surface of the thrust bearing base, and the surface of the thrust air bearing is fixed to the inner wall of the double-layer recessed groove with epoxy resin. The conical inclined surface in the middle of the central shaft mates with the radial air bearing, and the conical surface is aligned with the interior of the radial air bearing. The conical surface clearance is 12-15 micrometers. The conical plane in the middle of the central shaft mates with the thrust air bearing, and the clearance between the conical plane and the porous ceramic surface of the thrust air bearing is 12-15 micrometers. After the central shaft is installed with the radial and thrust air bearings, the radial and thrust air bearings are fixed together with bolts. Porous ceramic is used as the air medium for the air bearing, ensuring stable airflow and uniform air output, which can significantly reduce the radial and end face runout of the air bearing. A conical radial air bearing is used, which can prevent both radial and axial runout of the main shaft, achieving a dual effect. The structure is simple and can effectively reduce assembly errors. Attached Figure Description

[0014] Figure 1 This is a front view schematic diagram of the structure of this utility model;

[0015] Figure 2 This is an exploded view of the structure of this utility model;

[0016] Figure 3 This is a front sectional view of the structure of this utility model;

[0017] Figure 4 This is a top view schematic diagram of the double-layer recessed groove structure of this utility model.

[0018] In the figure: 1. Radial air bearing; 2. Radial bearing base; 21. Conical hollow groove; 3. Thrust air bearing; 31. Circular hollow groove; 4. Thrust bearing base; 41. Double-layer recessed groove; 5. Central shaft. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] Please see Figures 1-4 An embodiment of a high-precision air-float rotation device provided by this utility model:

[0021] The epoxy resin adhesive and bolts used in this application are products that can be purchased directly from the market. Their principles and connection methods are existing technologies well known to those skilled in the art, and therefore will not be described in detail here.

[0022] A high-precision air-bearing rotation device includes: a thrust air-bearing bearing 3;

[0023] The surface of the thrust air bearing 3 has a circular hollow groove 31. A central shaft 5 is inserted into the inner side of the circular hollow groove 31. A radial air bearing 1 is sleeved on the outer side of the center shaft 5. A radial bearing base 2 is provided on the outer side of the radial air bearing 1. A conical hollow groove 21 is provided on the bottom surface of the radial bearing base 2. A thrust bearing base 4 is provided on the outer side of the thrust air bearing 3. A double-layer recessed groove 41 is provided on the top surface of the thrust bearing base 4. The upper end of the radial air bearing 1 is embedded in the conical hollow groove 21 on the bottom surface of the radial bearing base 2, and the upper end of the radial air bearing 1 is fixed to the inner side of the conical hollow groove 21 by epoxy resin. This radial air bearing 1 can prevent both radial runout and axial runout of the spindle, achieving a dual effect. The thrust air bearing 3 is embedded in the double-layer recessed groove 41 on the top surface of the thrust bearing base 4, and the surface of the thrust air bearing 3 is fixed by epoxy resin. The resin adhesive is fixed in the inner wall of the double-layer recessed groove 41; the conical inclined surface in the middle of the central shaft 5 mates with the radial air bearing 1, and the gap between the conical surface and the inner conical surface of the radial air bearing 1 is 12-15 micrometers; the conical plane in the middle of the central shaft 5 mates with the thrust air bearing 3, and the gap between the conical plane and the porous ceramic surface of the thrust air bearing 3 is 12-15 micrometers; after the central shaft 5 is installed with the radial air bearing 1 and the thrust air bearing 3, the radial air bearing 1 and the thrust air bearing 3 are fixed by bolts; the porous ceramic is used as the air medium of the air bearing, the airflow is stable and the air output is uniform, which can significantly reduce the radial runout and end face runout of the air bearing; the conical radial air bearing 1 is used, which can prevent both the radial runout and the axial runout of the main shaft, achieving a dual effect, with a simple structure, which can effectively reduce assembly errors.

[0024] Furthermore, the thrust air bearing 3 is embedded in the inner side of the double-layer recessed groove 41, and the thrust air bearing 3 is fixedly connected to the inner wall of the double-layer recessed groove 41 by epoxy resin adhesive, and the connection between the thrust air bearing 3 and the thrust bearing base 4 is stable.

[0025] Furthermore, the thrust bearing base 4 has a cylindrical shape.

[0026] Furthermore, the upper end of the radial air bearing 1 is embedded in the inner side of the conical hollow groove 21. The radial air bearing 1 is fixedly connected to the inner wall of the conical hollow groove 21 by epoxy resin glue, which can prevent both radial runout and axial runout of the spindle, thus achieving a dual effect.

[0027] Furthermore, the central shaft 5 is conical in the middle and cylindrical at the top and bottom. The inclined surface of the cone is fitted with the radial air bearing 1, and the flat surface of the cone is fitted with the thrust air bearing 3.

[0028] Furthermore, the thrust bearing base 4 is fixedly connected to the radial bearing base 2 by bolts, and the assembly between the radial bearing base 2 and the thrust bearing base 4 is convenient.

[0029] Working principle: The upper end of the radial air bearing 1 is embedded in the conical hollow groove 21 on the bottom surface of the radial bearing base 2, and the upper end of the radial air bearing 1 is fixed to the inner side of the conical hollow groove 21 with epoxy resin. This radial air bearing 1 can prevent both radial runout and axial runout of the spindle, achieving a dual effect. The thrust air bearing 3 is embedded in the double-layer recessed groove 41 on the top surface of the thrust bearing base 4, and the surface of the thrust air bearing 3 is fixed to the double-layer recessed groove with epoxy resin. In the inner wall of groove 41, the conical inclined surface in the middle of the central shaft 5 mates with the radial air bearing 1, and the gap between the conical surface and the inner conical surface of the radial air bearing 1 is 12-15 micrometers. The conical plane in the middle of the central shaft 5 mates with the thrust air bearing 3, and the gap between the conical plane and the porous ceramic surface of the thrust air bearing 3 is 12-15 micrometers. After the central shaft 5 is installed with the radial air bearing 1 and the thrust air bearing 3, the radial air bearing 1 and the thrust air bearing 3 are fixed by bolt connection.

[0030] Using porous ceramics as the air medium for the air bearing ensures stable airflow and uniform air output, significantly reducing radial and axial runout of the air bearing. A conical radial air bearing 1 is used, which can prevent both radial and axial runout of the spindle, achieving a dual effect. The structure is simple and can effectively reduce assembly errors.

[0031] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model in any way. Those skilled in the art can readily implement this utility model based on the accompanying drawings and the above description. However, any modifications, alterations, or equivalent variations made by those skilled in the art without departing from the scope of the utility model's technical solution, utilizing the disclosed technical content, are considered equivalent embodiments of this utility model. Furthermore, any equivalent changes, alterations, or variations made to the above embodiments based on the essential technology of this utility model are still within the protection scope of this utility model's technical solution.

Claims

1. A high-precision air-float rotation device, comprising: Thrust air bearing (3); Its features are: The surface of the thrust air bearing (3) is provided with a circular hollow groove (31), a central shaft (5) is inserted into the inner side of the circular hollow groove (31), a radial air bearing (1) is sleeved on the outer side of the middle part of the central shaft (5), a radial bearing base (2) is provided on the outer side of the radial air bearing (1), a conical hollow groove (21) is provided on the bottom surface of the radial bearing base (2), a thrust bearing base (4) is provided on the outer side of the thrust air bearing (3), and a double-layer recessed groove (41) is provided on the top surface of the thrust bearing base (4).

2. The high-precision air-float rotation device according to claim 1, characterized in that: The thrust air bearing (3) is embedded in the inner side of the double-layer recessed groove (41), and the thrust air bearing (3) is fixedly connected to the inner wall of the double-layer recessed groove (41) by epoxy resin.

3. The high-precision air-float rotation device according to claim 1, characterized in that: The thrust bearing base (4) has a cylindrical shape.

4. The high-precision air-float rotation device according to claim 1, characterized in that: The upper end of the radial air bearing (1) is embedded in the inner side of the conical hollow groove (21), and the radial air bearing (1) is fixedly connected to the inner wall of the conical hollow groove (21) by epoxy resin glue.

5. The high-precision air-float rotation device according to claim 1, characterized in that: The central shaft (5) is conical in the middle and cylindrical at the top and bottom. The inclined surface of the cone is matched with the radial air bearing (1), and the flat surface of the cone is matched with the thrust air bearing (3).

6. The high-precision air-float rotation device according to claim 1, characterized in that: The thrust bearing base (4) is fixedly connected to the radial bearing base (2) by bolts.

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