Air floatation main shaft capable of improving axial bearing capacity and controlling axial movement

Abstract

The invention discloses an air floating spindle capable of improving axial bearing capacity and controlling axial movement, and belongs to the technical field of air floating spindles, the air floating spindle comprises a shaft body, a protection assembly is arranged on the surface of the shaft body, an installation assembly is installed on the shaft body, the installation assembly and the shaft body are provided with a first auxiliary assembly, and a second auxiliary assembly is arranged on the surface of the shaft body. The protection assembly is arranged on the shaft body, so that the axial bearing capacity and the angular rigidity of the shaft body can be improved, the influence of corrosive media such as acid and alkali is prevented, the shaft body is protected against high-temperature corrosion, and abrasion of the shaft body under heavy load is reduced; meanwhile, the filtering assemblies arranged between the second auxiliary assembly and the first auxiliary assembly can effectively filter impurities and particulate matter in gas and prevent the impurities and particulate matter from entering the bearing, so that bearing abrasion is reduced, meanwhile, the first auxiliary assembly arranged on the mounting assembly improves the bearing capacity and angle steel degree of the air floating spindle, the axial bearing capacity of the spindle can be remarkably improved, and the service life of the spindle is prolonged. And the axial movement is effectively controlled.

Description

Technical Field

[0001] The invention relates to the field of air-floating main shafts, and in particular to an air-floating main shaft capable of improving axial bearing capacity and controlling axial movement. Background Art

[0002] As a high-precision, high-speed rotating support device, the air bearing spindle is widely used in precision machining machine tools, optical instruments, high-speed rotating equipment, etc. Its performance mainly depends on the bearing capacity and stiffness, which are directly related to the stability and precision maintenance ability of the spindle.

[0003] However, in a complex industrial environment, the spindle is easily corroded by corrosive media such as acids and alkalis, as well as the influence of high temperature environment, which reduces its service life. In addition, the existing air-floating spindle is also insufficient in filtering and purifying gas. Impurities and particulate matter in the gas can easily enter the air-floating spindle, causing the air-floating spindle to wear more severely, affecting the performance and reliability of the spindle.

[0004] Currently, no effective solution has been proposed for the problems in the related technologies. Summary of the invention

[0005] 1. Technical issues to be resolved

[0006] In view of the deficiencies in the prior art, the present invention provides an air-floating main shaft for improving the axial bearing capacity and controlling the axial movement, which has the advantages of the above-mentioned technical problems and thus solves the problems in the prior art.

[0007] (II) Technical solution

[0008] In order to achieve the advantages of the above technical problems, the specific technical solutions adopted by the present invention are as follows:

[0009] An air-floating main shaft for improving axial bearing capacity and controlling axial movement, comprising a shaft body, a protective component arranged on the surface of the shaft body, the protective component comprising a strengthening coating, an anti-corrosion coating, a heat-insulating coating, and a wear-resistant coating arranged in sequence on the surface of the shaft body, and a mounting component installed on the shaft body;

[0010] The mounting component and the shaft body are provided with an auxiliary component one, the surface of the shaft body is provided with an auxiliary component two, and the auxiliary component two and the auxiliary component one are provided with a filter component.

[0011] Furthermore, in order to reduce the weight of the main shaft, improve the wear reduction performance, help reduce energy consumption and improve operating efficiency, the installation assembly includes a shaft flange arranged on the shaft body, a shaft flange plate is installed on one side of the shaft body, a plurality of fastening screws are threaded on the shaft flange plate, the shaft flange plate is separated from the shaft flange by a shaft shoulder, and the axial clearance is adjusted by an adjusting pad.

[0012] Furthermore, in order to significantly improve the axial load-bearing capacity of the main shaft and effectively control the axial movement, the auxiliary component includes a thrust bearing of a thrust bearing ring installed corresponding to one side of the shaft flange, a rear thrust bearing installed corresponding to the other side of the shaft flange, one side of the flange plate on the shaft corresponds to the other side of the thrust bearing of the thrust bearing ring, and a front thrust bearing is installed corresponding to the other side of the flange plate on the shaft. The thrust bearing ring is connected to the base of the front thrust bearing and the base of the rear thrust bearing by screws, and sealing top screws are arranged on the thrust bearing ring and the front thrust bearing and the rear thrust bearing.

[0013] Furthermore, in order to optimize the gas flow, auxiliary component 2 includes a radial bearing connected to the axial diameter surface of the shaft body, the inner wall of the radial bearing and the surface of the shaft body are provided with a plurality of corresponding annular exhaust grooves, the inner wall of the radial bearing and the axial diameter surface of the shaft body corresponding to the annular exhaust grooves are provided with exhaust holes distributed at equal distances, the radial bearing is provided with small-hole throttling inlet holes 1 distributed at equal distances, and a plurality of inlet channels are provided on the adjustment pad and the front thrust bearing, the thrust bearing ring and the rear thrust bearing.

[0014] Furthermore, in order to reduce the wear of the shaft under heavy load, the filter assembly includes an air inlet channel and a small hole throttling air inlet hole with a filter cover installed on the inner wall, and the inner wall of the filter cover is installed with a filter screen plate and an activated carbon plate in sequence from the outside to the inside.

[0015] Furthermore, in order to improve the bearing capacity of the air-floating main shaft and the angular stiffness of the thrust bearing, both sides of the thrust bearing of the thrust bearing ring are in contact with the adjustment pad, and an inner gap is provided at the intersection of the adjustment pad and the flange plate on the shaft and the inner side of the shaft body flange.

[0016] Furthermore, in order to improve the bearing capacity of the air-floating main shaft and the angular stiffness of the thrust bearing, the front thrust bearing and the rear thrust bearing are in contact with the adjustment pad and the thrust bearing ring, and an outer gap is provided at the intersection of the adjustment pad and the flange plate and the outer side of the shaft flange.

[0017] Furthermore, small-hole throttling air inlet holes 2 which are equally distributed are provided on the front thrust bearing, the rear thrust bearing and the thrust bearings on both sides of the thrust bearing ring.

[0018] Furthermore, radial exhaust holes which are evenly distributed in the radial direction are opened on the shaft shoulder of the shaft body, and axial exhaust holes which are evenly distributed in the axial connection between the shaft body and the shaft body flange are opened.

[0019] Furthermore, an axial through hole is provided on the shaft body, and the axial through hole is communicated with the radial exhaust hole of the shaft shoulder and the axial exhaust hole.

[0020] (III) Beneficial effects

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] (1) By setting a protective component on the shaft, the axial bearing capacity and angular stiffness of the shaft can be improved, the influence of corrosive media such as acids and alkalis can be prevented, the shaft can be protected from high temperature erosion, and the wear of the shaft under heavy load can be reduced. At the same time, the filter components set in auxiliary component 2 and auxiliary component 1 can effectively filter impurities and particulate matter in the gas to prevent them from entering the bearing, thereby reducing bearing wear and improving the performance and reliability of the main shaft.

[0023] (2) By means of the mounting assembly arranged on the shaft body, the components on the air-floating spindle can be installed, which helps to reduce weight and provide better anti-friction performance. At the same time, the auxiliary assembly 1 arranged on the mounting assembly improves the bearing capacity and angle steel degree of the air-floating spindle, which can significantly improve the axial bearing capacity of the spindle, effectively control the axial movement, and ensure the stable operation of the spindle under high load and high precision requirements. At the same time, the auxiliary assembly 2 arranged on the shaft body can optimize the gas flow and further improve the operation efficiency and stability of the spindle. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 It is a schematic diagram of the structure of an installation assembly of an air-floating main shaft for improving axial bearing capacity and controlling axial movement according to an embodiment of the present invention;

[0026] Figure 2 It is a schematic diagram of the structure of a protective component of an air-floating main shaft for improving axial bearing capacity and controlling axial movement according to an embodiment of the present invention;

[0027] Figure 3 It is a partial structural diagram of an auxiliary component 1 and a mounting component of an air-floating main shaft for improving axial bearing capacity and controlling axial movement according to an embodiment of the present invention;

[0028] Figure 4 It is a schematic diagram of the cross-sectional structure of the shaft body and through hole of an air-floating main shaft for improving the axial bearing capacity and controlling the axial movement according to an embodiment of the present invention;

[0029] Figure 5 The schematic diagram of the two-part structure of an auxiliary component of an air-floating main shaft for improving axial bearing capacity and controlling axial movement according to an embodiment of the present invention is shown in FIG. Figure 1 ;

[0030] Figure 6The schematic diagram of the two-part structure of an auxiliary component of an air-floating main shaft for improving axial bearing capacity and controlling axial movement according to an embodiment of the present invention is shown in FIG. Figure 2 ;

[0031] Figure 7 It is a schematic diagram of the structure of a filter assembly of an air-floating main shaft for improving axial bearing capacity and controlling axial movement according to an embodiment of the present invention;

[0032] Figure 8 The present invention is a schematic structural diagram of a front thrust bearing, a thrust bearing ring and a rear thrust bearing of an air-floating main shaft for improving axial bearing capacity and controlling axial movement according to an embodiment of the present invention.

[0033] In the figure:

[0034] 1. Shaft body; 2. Protection components; 201. Strengthening coating; 202. Anti-corrosion coating; 203. Heat-insulating coating; 204. Wear-resistant coating; 3. Installation components; 301. Shaft body flange; 302. Flange plate on shaft; 303. Fastening screws; 304. Adjustment pad; 4. Auxiliary component 1; 401. Front thrust bearing; 4011. Front thrust bearing seat; 4012. Thrust bearing 1; 402. Thrust bearing ring; 4021. Thrust bearing ring body; 4022. Thrust bearing 2; 403. Rear thrust shaft Bearing; 4031, rear thrust bearing seat; 4032, thrust bearing three; 404, sealing top screw; 5, auxiliary component two; 501, radial bearing; 502, annular exhaust groove; 503, exhaust hole; 504, small hole throttling air inlet hole one; 505, air intake channel; 6, filter component; 601, filter cover; 602, filter screen; 603, activated carbon plate; 7, inner gap; 8, outer gap; 9, small hole throttling air inlet hole two; 10, radial exhaust hole; 11, axial exhaust hole; 12, axial through hole. DETAILED DESCRIPTION

[0035] To further illustrate the technical solution of the present application, the present invention provides drawings, which are part of the disclosure of the present invention and are mainly used to illustrate the implementation methods. They can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the implementation methods. With reference to these contents, ordinary technicians in this field should be able to understand other possible implementation methods and advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0036] like Figure 1 - Figure 7 As shown, the present invention provides a technical solution: an air-floating main shaft for improving axial bearing capacity and controlling axial movement, comprising a shaft body 1, a protective component 2 is arranged on the surface of the shaft body 1, and the protective component 2 comprises a strengthening coating 201, an anti-corrosion coating 202, a heat-insulating coating 203, and a wear-resistant coating 204 arranged in sequence on the surface of the shaft body 1;

[0037] The strengthening coating 201 is composed of a titanium nitride coating, a titanium carbide coating, and a nano coating, and is used to improve the anti-friction performance of the shaft and reduce power consumption. The anti-corrosion coating 202 is composed of a nickel-phosphorus alloy coating, a stainless steel coating, and a zinc-based coating, and is used to prevent the shaft 1 from being affected by corrosive media such as acids and alkalis. The heat-insulating coating 203 is composed of a thermal barrier coating and a molybdenum-silicon-boron coating, and is used to protect the shaft 1 from high-temperature erosion. The wear-resistant coating 204 is composed of a chromium nitride coating and an aluminum oxide coating, and is used to reduce the wear of the shaft 1 under heavy load.

[0038] The shaft body 1 is provided with a mounting assembly 3, which includes a shaft body flange 301 provided on the shaft body 1, and a shaft flange plate 302 is provided on one side of the shaft body 1. The shaft flange plate 302 is made of a lightweight material such as titanium alloy and a lightweight material with good anti-friction performance such as ceramic and graphite alloy. The shaft flange plate 302 is threadedly connected with a plurality of fastening screws 303. The number of the fastening screws 303 is eight, and the number can also be adjusted according to actual conditions. The shaft flange plate 302 is separated from the shaft body flange 301 by a shaft shoulder, and the axial clearance is adjusted by an adjusting pad 304.

[0039] The shoulder of the shaft body 1 is provided with radial exhaust holes 10 which are evenly distributed in the radial direction, the axial intersection of the shaft body 1 and the shaft body flange 301 is provided with axial exhaust holes 11 which are evenly distributed in the radial direction, and the shaft body 1 is provided with axial through holes 12 which are connected with the shoulder radial exhaust holes 10 and the axial exhaust holes 11.

[0040] like Figure 1 - Figure 8 As shown, an auxiliary component 1-4 is provided between the mounting component 3 and the shaft body 1, and the auxiliary component 1-4 includes a thrust bearing of a thrust bearing ring 402 correspondingly installed on one side of the shaft body flange 301, and a rear thrust bearing 403 is correspondingly installed on the other side of the shaft body flange 301, and one side of the shaft flange plate 302 corresponds to the other side of the thrust bearing of the thrust bearing ring 402, and the other side of the shaft flange plate 302 corresponds to the front thrust bearing 401, and the thrust bearing ring 402 is connected with the machine base of the front thrust bearing 401 and the machine base of the rear thrust bearing 403 by screws, and the thrust bearing ring 402 and the front thrust bearing 401 and the rear thrust bearing 403 are provided with sealing top screws 404, and the specific detailed number of the sealing top screws 404 can be adjusted according to actual conditions, and the adjustment pad 304 can be made into one body with the front thrust bearing 401 and the thrust bearing ring 402 respectively;

[0041] The front thrust bearing 401 is composed of a front thrust bearing seat 4011 and a thrust bearing 1 4012. The thrust bearing ring 402 is composed of a thrust bearing ring body 4021 and two thrust bearing 2 4022. The two thrust bearing 2 4022 are located on both sides of the thrust bearing ring body 4021. The rear thrust bearing 403 is composed of a rear thrust bearing seat 4031 and a thrust bearing 3 4032.

[0042] The thrust bearing of the thrust bearing ring 402 contacts with the adjusting pad 304 on both sides, and the inner gap 7 is provided at the intersection of the adjusting pad 304, the flange plate 302 on the shaft, and the inner side of the shaft body flange 301. The front thrust bearing 401 and the rear thrust bearing 403 contact with the adjusting pad 304 and the thrust bearing ring 402, and the outer gap 8 is provided at the intersection of the adjusting pad 304, the flange plate 302 on the shaft, and the outer side of the shaft body flange 301. The inner and outer gaps are used to achieve a double-row thrust bearing that can increase the load-bearing capacity, improve the axial stiffness, and control the shaft. To reduce the effect of axial movement, appropriately increase and adjust one of the outer clearance 8 or the inner clearance 7 to avoid excessive heating. The two sets of clearances act differently on the same shaft to produce mutual inhibition to avoid air hammer, effectively reducing the manufacturing difficulty. The double thrust action better resists external impact, greatly improves the axial rigidity, effectively controls the axial movement, and has more prominent angular rigidity, which can effectively control the angular swing. The front thrust bearing 401, the rear thrust bearing 403 and the thrust bearing ring 402 on both sides are provided with small hole throttling air inlet holes 9 with equal distance distribution.

[0043] The surface of the shaft body 1 is provided with an auxiliary component 2 5, and the auxiliary component 2 5 includes a radial bearing 501 connected to the axial diameter surface of the shaft body 1, and the inner wall of the radial bearing 501 and the surface of the shaft body 1 are provided with a plurality of corresponding annular exhaust grooves 502, and the inner wall of the radial bearing 501 and the axial diameter surface of the shaft body 1 corresponding to the annular exhaust grooves 502 are provided with exhaust holes 503 distributed at equal distances, and the radial bearing 501 is provided with a small hole throttling air inlet hole 1 504 distributed at equal distances, and the adjustment pad 304 and the front thrust bearing 401, the thrust bearing ring 402 and the rear thrust bearing 403 are provided with a plurality of air inlet channels 505, and the actual number of the air inlet channels 505 is adjusted according to the actual situation, and the adjustment pad 304 and the front thrust bearing 401, the thrust bearing ring 402 and the rear thrust bearing 403 are air-intaken through the air inlet channel 505;

[0044] The main shaft radial and thrust bearing exhaust is discharged through the radial exhaust hole 10, the axial exhaust hole 11, and the exhaust hole 503 through the axial through hole 12. The exhaust through the inside of the shaft can effectively dissipate the heat of the shaft, the inert effect of the gas suppresses high-frequency vibration, improves the stability of the shaft, and the exhaust efficiency is more direct and efficient.

[0045] A filter assembly 6 is provided on auxiliary assembly 2 5 and auxiliary assembly 1 4, and the filter assembly 6 includes an air inlet channel 505 and a filter cover 601 installed on the inner wall of the small hole throttling air inlet hole 1 504, and a filter mesh plate 602 and an activated carbon plate 603 are installed on the inner wall of the filter cover 601 in sequence from the outside to the inside.

[0046] In summary, by means of the above technical solution of the present invention, the reinforcing coating 201, the anti-corrosion coating 202, the heat-insulating coating 203 and the wear-resistant coating 204 are sequentially applied on the surface of the shaft body 1, so as to improve the axial bearing capacity and angular stiffness of the shaft body 1, prevent the influence of corrosive media such as acid and alkali, protect the shaft body 1 from high temperature erosion, and reduce the wear of the shaft body 1 under heavy load;

[0047] Then install the thrust bearing ring 402 between the shaft body flange 301 and the shaft flange plate 302, ensure that it is aligned with the front thrust bearing 401 and the rear thrust bearing 403, use screws to connect the thrust bearing ring 402 with the front thrust bearing 401, the adjustment pad 304 and the rear thrust bearing 403, set sealing top screw holes 404 on the front thrust bearing 401, the thrust bearing ring 402 and the rear thrust bearing 403 for gas sealing, and open an inner gap 7 at the intersection of the thrust bearing ring 402 and the adjustment pad 304, the shaft flange plate 302 and the shaft body flange 301;

[0048] An outer gap 8 is provided at the intersection of the flange plate 302 on the shaft, the outer side of the shaft flange 301, the adjustment pad 304, the front thrust bearing 401, and the rear thrust bearing 403. These gaps are used to increase the load-bearing capacity and avoid excessive heating and air hammer phenomena. Then, the radial bearing 501 is installed on the axial diameter surface of the shaft body 1, and a plurality of corresponding annular exhaust grooves 502 are provided on the inner wall of the radial bearing 501 and the surface of the shaft body 1. Exhaust holes 503 distributed at equal distances are provided in the corresponding annular exhaust grooves 502. Small hole throttling air inlet holes 504 distributed at equal distances are provided on the radial bearing 501. A plurality of air inlet channels 505 are provided on the adjustment pad 304 and the front thrust bearing 401, the thrust bearing ring 402, and the rear thrust bearing 403 for gas to flow in.

[0049] A filter cover 601 is installed on the inner wall of the air inlet channel 505 and the guide hole of the small hole throttling air inlet hole 504, and a filter screen plate 602 and an activated carbon plate 603 are installed on the inner wall of the filter cover 601 from the outside to the inside. The filter screen plate 602 is used to filter larger impurity particles, and the activated carbon plate 603 is used to absorb fine particles and impurities in the gas. Equidistantly distributed radial exhaust holes 10 are opened on the shoulder of the shaft body 1, and equidistantly distributed exhaust holes 503 are opened on the shoulder of the shaft body 1. Equidistantly distributed axial exhaust holes 11 are opened at the axial intersection of the shaft body 1 and the shaft body flange 301. An axial through hole 12 is opened on the shaft body 1, and it is ensured that the axial through hole 12 is connected with the radial exhaust hole 10 and the exhaust hole 503, so as to optimize the radial bearing 501 and the thrust bearing ring 402. The thrust bearing gas is discharged through the shaft body 1;

[0050] When the gas passes through the filter assembly 6, impurities and particulate matter are filtered out by the filter plate 602 and the activated carbon plate 603, ensuring that the gas entering the bearing is clean. The gas flows through the radial bearing 501 and the front thrust bearing 401, the thrust bearing ring 402, and the rear thrust bearing 403, and is discharged into the radial and axial load-bearing areas through the small hole throttling air inlet hole 2 9 and the small hole throttling air inlet hole 1 504, ensuring the cleanliness, efficiency and stability of the main shaft operation. According to the actual operating conditions, the size of the inner gap 7 and the outer gap 8 is adjusted to achieve the best load-bearing capacity and operating efficiency, ensuring the axial rigidity and angular rigidity of the main shaft.

[0051] In the present invention, unless otherwise clearly stipulated and limited, the terms such as "installation", "setting", "connection", "fixation" and "screw-on" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in the present invention according to the specific circumstances.

[0052] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An air-floating spindle for improving axial bearing capacity and controlling axial movement, characterized in that: The invention comprises a shaft body (1), a protection component (2) being arranged on the surface of the shaft body (1), the protection component (2) comprising a reinforcement coating (201), an anti-corrosion coating (202), a heat-insulating coating (203), and a wear-resistant coating (204) arranged in sequence on the surface of the shaft body (1), and a mounting component (3) being mounted on the shaft body (1); The mounting assembly (3) and the shaft body (1) are provided with an auxiliary assembly 1 (4), the surface of the shaft body (1) is provided with an auxiliary assembly 2 (5), and a filter assembly (6) is provided on the auxiliary assembly 2 (5) and the auxiliary assembly 1 (4).

2. The air-bearing spindle for improving axial bearing capacity and controlling axial movement according to claim 1, characterized in that: The mounting assembly (3) comprises a shaft body flange (301) arranged on the shaft body (1); a shaft flange plate (302) is mounted on one side of the shaft body (1); a plurality of fastening screws (303) are threadedly connected to the shaft flange plate (302); the shaft flange plate (302) is separated from the shaft body flange (301) by a shaft shoulder, and an axial clearance is adjusted by an adjusting pad (304).

3. The air-bearing spindle for improving axial bearing capacity and controlling axial movement according to claim 2, characterized in that: The auxiliary component 1 (4) comprises a thrust bearing of a thrust bearing ring (402) installed corresponding to one side of the shaft flange (301), a rear thrust bearing (403) installed corresponding to the other side of the shaft flange (301), one side of the shaft flange plate (302) corresponds to the other side of the thrust bearing of the thrust bearing ring (402), a front thrust bearing (401) is installed corresponding to the other side of the shaft flange plate (302), the thrust bearing ring (402) is connected to the machine base of the front thrust bearing (401) and the machine base of the rear thrust bearing (403) by screws, and sealing top screws (404) are arranged on the thrust bearing ring (402) and the front thrust bearing (401) and the rear thrust bearing (403).

4. The air-bearing spindle for improving axial bearing capacity and controlling axial movement according to claim 3, characterized in that: The auxiliary component 2 (5) comprises a radial bearing (501) connected to the axial diameter surface of the shaft body (1); the inner wall of the radial bearing (501) and the surface of the shaft body (1) are provided with a plurality of corresponding annular exhaust grooves (502); the inner wall of the radial bearing (501) and the axial diameter surface of the shaft body (1) corresponding to the annular exhaust grooves (502) are provided with exhaust holes (503) distributed at equal distances; the radial bearing (501) is provided with small hole throttling air inlet holes 1 (504) distributed at equal distances; and the adjustment pad (304) and the front thrust bearing (401), the thrust bearing ring (402) and the rear thrust bearing (403) are provided with a plurality of air inlet channels (505).

5. The air-bearing main shaft for improving axial bearing capacity and controlling axial movement according to claim 4, characterized in that: The filter assembly (6) comprises a filter cover (601) installed on the inner wall of the air inlet channel (505) and the small hole throttling air inlet hole 1 (504), and the inner wall of the filter cover (601) is installed with a filter screen plate (602) and an activated carbon plate (603) in sequence from the outside to the inside.

6. The air-bearing main shaft for improving axial bearing capacity and controlling axial movement according to claim 5, characterized in that: Both sides of the thrust bearing of the thrust bearing ring (402) are in contact with the adjustment pad (304), and an inner gap (7) is provided at the intersection of the adjustment pad (304) with the flange plate (302) on the shaft and the inner side of the shaft body flange (301).

7. The air-bearing main shaft for improving axial bearing capacity and controlling axial movement according to claim 6, characterized in that: The front thrust bearing (401) and the rear thrust bearing (403) are in contact with the adjustment pad (304) and the thrust bearing ring (402); an outer gap (8) is provided at the intersection of the adjustment pad (304) and the flange plate (302) on the shaft and the outer side of the shaft body flange (301).

8. The air-bearing main shaft for improving axial bearing capacity and controlling axial movement according to claim 7, characterized in that: The front thrust bearing (401), the rear thrust bearing (403) and the thrust bearings on both sides of the thrust bearing ring (402) are provided with two small throttling air inlet holes (9) distributed at equal distances.

9. The air-bearing main shaft for improving axial bearing capacity and controlling axial movement according to claim 8, characterized in that: The shaft shoulder of the shaft body (1) is provided with radial exhaust holes (10) which are distributed at equal distances in the radial direction, and the axial intersection between the shaft body (1) and the shaft body flange (301) is provided with axial exhaust holes (11) which are distributed at equal distances in the radial direction.

10. The air-bearing main shaft for improving axial bearing capacity and controlling axial movement according to claim 9, characterized in that: The shaft body (1) is provided with an axial through hole (12), and the axial through hole (12) is in communication with the shaft shoulder radial exhaust hole (10) and the axial exhaust hole (11).

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