High-precision air-floating turntable

Abstract

The utility model relates to the field of precision machining technology, concretely to high-precision air float turntable. The utility model discloses bottom fixed base, the surface of bottom fixed base is equipped with the shell, the surface of bottom fixed base is opened four screw holes, the surface of shell is installed with rotary table surface, the surface of bottom fixed base is installed with two light source support frames, the surface of light source support frame is installed with light source fixed base, the inner wall of light source support frame and light source fixed base is slidably installed with the illumination light source, one side of bottom fixed base is fixedly connected with power source interface and encoder interface, one side of bottom fixed base is equipped with the air inlet. Solveed the most ball bearing rotation and caused the turntable non-repetitive bounce to be bigger, influenced the machining surface precision and roughness, cannot satisfy the use requirement. And the problem that the air float static pressure bearing is mostly low in rigidity, is easy to jam, and the imported main shaft is expensive and inconvenient to maintain.

Description

Technical Field

[0001] This utility model relates to the field of precision machining technology, and in particular to a high-precision air-bearing turntable. Background Technology

[0002] For industries requiring high precision and producing small-sized parts, existing rotary tables are divided into two categories: ball bearings and hydrostatic bearings. The rotation of most ball bearings causes significant non-repeatable runout of the rotary table, affecting the surface accuracy and roughness of the machined parts, thus failing to meet usage requirements. On the other hand, air-bearing hydrostatic bearings generally have low rigidity, are prone to jamming, and imported spindles are expensive and difficult to maintain.

[0003] Therefore, an air-bearing turntable is needed to meet the requirements of high precision and sufficient rigidity, to accurately control the rotation angle, improve the stability of equipment operation, and at the same time reduce the cost of the turntable.

[0004] Regarding the aforementioned and existing related technologies, the inventors believe that the following defects often exist: the rotation of most ball bearings causes large non-repeatable runout of the turntable, affecting the precision and roughness of the machined surface, and failing to meet the usage requirements. Furthermore, most air-bearing hydrostatic bearings have low rigidity, are prone to jamming, and imported spindles are expensive and inconvenient to maintain. Therefore, a high-precision air-bearing turntable is proposed to address these problems. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of existing technologies, such as the large non-repeatable runout of the turntable caused by the rotation of most ball bearings, which affects the precision and roughness of the machined surface and fails to meet usage requirements. Furthermore, air-bearing hydrostatic bearings generally have low rigidity, are prone to jamming, and imported spindles are expensive and difficult to maintain. Therefore, this invention proposes a high-precision air-bearing turntable.

[0006] To achieve the above objectives, this utility model adopts the following technical solution: a high-precision air-bearing turntable, including a bottom fixed base, a shell mounted on the surface of the bottom fixed base, four screw holes on the surface of the bottom fixed base, a rotating table surface mounted on the surface of the shell, two light source support frames mounted on the surface of the bottom fixed base, a light source fixing base mounted on the surface of the light source support frames, an illumination light source slidably mounted on the inner wall of the light source support frames and the light source fixing base, a power interface and an encoder interface fixedly connected to one side of the bottom fixed base, an air inlet on one side of the bottom fixed base, an axial air bearing mounted in the inner cavity of the shell, a radial air bearing attached to one side of the axial air bearing, a positioning ring mounted on the lower surface of the axial air bearing and the radial air bearing, an encoder bracket mounted in the inner cavity of the shell, an encoder body mounted on the surface of the encoder bracket, an encoder disk body mounted on the surface of the encoder body, a motor stator mounted in the inner cavity of the shell, a motor rotor mounted on one side of the motor, an encoder disk bracket mounted on the surface of the encoder disk body, and the encoder disk bracket abutting against the positioning ring.

[0007] The effects achieved by the above components are as follows: the combination of axial and radial air bearings, replacing traditional mechanical contact with air film support, greatly reduces frictional resistance and wear, effectively reduces vibration and noise during operation, and ensures the stability and smoothness of rotational motion. The precise cooperation between the encoder body and the encoder disk body can provide real-time and accurate feedback on the rotation angle and position information of the turntable, realizing high-precision closed-loop control and significantly improving the positioning accuracy of the turntable. The efficient drive system of the motor stator and rotor, combined with a reasonable structural layout, gives the turntable powerful driving torque and fast response capability. In addition, the screw hole design of the bottom mounting base facilitates installation and fixation. The reasonable setting of functional modules such as air inlet, power interface and encoder interface not only facilitates the connection and debugging of the equipment, but also enhances the versatility and expandability of the turntable, meets the diverse needs of high-precision rotational applications, and improves the practicality of the device.

[0008] Preferably, an adjusting spacer is slidably installed in the inner cavity of the housing, and the adjusting spacer abuts against the motor stator.

[0009] The aforementioned components achieve the following effects: by adjusting the sliding adjustment of the spacer ring, the axial position of the motor stator can be precisely controlled, ensuring that the optimal air gap is maintained between the motor stator and rotor, effectively improving the motor's operating efficiency and stability, reducing energy loss and abnormal vibration caused by installation errors. At the same time, this structure can flexibly adapt to motor stators of different specifications, enhancing the versatility and interchangeability of the turntable components. During assembly and maintenance, staff can easily fine-tune the motor installation accuracy by adjusting the spacer ring, reducing assembly difficulty, shortening the debugging cycle, and significantly improving production and maintenance efficiency, providing strong support for the reliable operation of high-precision air-bearing turntables under complex working conditions.

[0010] Preferably, a sealing plug is slidably connected to the inner wall of the air inlet, and the size of the sealing plug is adapted to the size of the air inlet.

[0011] The effects achieved by the above components are as follows: when the turntable is not in use or is being maintained and repaired, the sealing plug can effectively block the air inlet, preventing dust, debris and other foreign objects from entering the equipment, avoiding air path blockage or contamination of key components such as air bearings, ensuring the cleanliness and operational reliability of the equipment. At the same time, the good sealing performance of the sealing plug can prevent gas leakage, maintain stable internal air path pressure during equipment idle periods, and avoid affecting the air flotation effect during subsequent use due to gas loss.

[0012] Preferably, a rubber ring is fixedly connected to the surface of the outer shell, and the rubber ring is in contact with the rotating table surface.

[0013] The effect achieved by the above components is that the rubber ring has good elasticity and sealing properties, which can effectively prevent external dust, moisture and other impurities from entering the turntable, avoid contamination or damage to precision components such as air bearings and encoders, and ensure a clean operating environment for the equipment.

[0014] Preferably, the lighting source is combined with the light source mounting base and the light source support frame.

[0015] The effect achieved by the above components is that, through the combined design of the lighting source, the light source mounting base, and the light source support frame, stable lighting conditions can be provided for the operation of the turntable.

[0016] Preferably, the outer shell is made of a high-strength, low-deformation material, which is made of one of the following materials: high-strength alloy structural steel, aluminum alloy, or magnesium alloy.

[0017] The effects achieved by the above components are as follows: the outer shell is made of high-strength alloy structural steel, aluminum alloy, or magnesium alloy, which has significant advantages. The use of high-strength alloy structural steel, with its excellent tensile strength and fatigue resistance, can withstand the complex stress during the operation of the turntable, ensuring that the outer shell is not easily deformed during long-term use, and providing a solid protective barrier for the internal precision components. When aluminum alloy is selected, its lightweight, high strength, and corrosion resistance characteristics can reduce the overall weight of the turntable, reduce the difficulty of installation and transportation, and effectively resist environmental erosion, extending the service life of the equipment. The application of magnesium alloy further achieves extreme lightweighting while maintaining good rigidity, reducing the inertia of the turntable and improving the rotational response speed and accuracy.

[0018] In this invention, the combination of axial and radial air bearings, with air film support replacing traditional mechanical contact, greatly reduces frictional resistance and wear, effectively minimizing vibration and noise during operation, ensuring the stability and smoothness of rotational motion. The precise fit between the encoder body and the encoder disk body enables real-time and accurate feedback of the turntable's rotation angle and position information, achieving high-precision closed-loop control and significantly improving the turntable's positioning accuracy. The efficient drive system of the motor stator and rotor, combined with a reasonable structural layout, gives the turntable powerful driving torque and rapid response capabilities. Furthermore, the screw hole design of the bottom mounting base facilitates installation and fixation. The reasonable arrangement of functional modules such as the air inlet, power interface, and encoder interface not only facilitates equipment connection and debugging but also enhances the turntable's versatility and expandability, meeting diverse high-precision rotation application needs and improving the device's practicality. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0020] Figure 2 This is a side view of the present invention;

[0021] Figure 3 This is a top view of the present invention;

[0022] Figure 4 In this utility model Figure 3 A sectional view.

[0023] Legend: 1. Bottom mounting base; 2. Housing; 3. Screw hole; 4. Rotating table; 5. Light source; 6. Power interface; 7. Encoder interface; 8. Air inlet; 9. Sealing plug; 10. Rubber sleeve; 11. Axial air bearing; 12. Radial air bearing; 13. Light source mounting base; 14. Light source support frame; 15. Positioning ring; 16. Encoder disk bracket; 17. Motor stator; 18. Motor rotor; 19. Encoder disk body; 20. Encoder body; 21. Encoder bracket; 22. Adjustment spacer. Detailed Implementation

[0024] Reference Figure 1-4As shown, this utility model provides a technical solution: a high-precision air-bearing turntable, including a bottom fixed base 1, a shell 2 mounted on the surface of the bottom fixed base 1, four screw holes 3 on the surface of the bottom fixed base 1, a rotating table surface 4 mounted on the surface of the shell 2, two light source support frames 14 mounted on the surface of the bottom fixed base 1, a light source fixing seat 13 mounted on the surface of the light source support frame 14, and an illumination light source 5 slidably mounted on the inner wall of the light source support frame 14 and the light source fixing seat 13, a power interface 6 and an encoder interface 7 fixedly connected to one side of the bottom fixed base 1, and an air inlet 8 on one side of the bottom fixed base 1, and the inner wall of the shell 2... An axial air bearing 11 is installed in the cavity. A radial air bearing 12 is attached to one side of the axial air bearing 11. A positioning ring 15 is installed on the lower surface of the axial air bearing 11 and the radial air bearing 12. An encoder bracket 21 is installed in the inner cavity of the outer shell 2. An encoder body 20 is installed on the surface of the encoder bracket 21. An encoder disk body 19 is installed on the surface of the encoder body 20. A motor stator 17 is installed in the inner cavity of the outer shell 2. A motor rotor 18 is installed on one side of the motor. An encoder disk bracket 16 is installed on the surface of the encoder disk body 19. The encoder disk bracket 16 abuts against the positioning ring 15. By using the axial air bearing 11 and radial air bearing 12, air film support replaces traditional mechanical contact, greatly reducing frictional resistance and wear, effectively reducing vibration and noise during operation, and ensuring the stability and smoothness of rotational motion. The precise cooperation between the encoder body 20 and the encoder disk body 19 enables real-time and accurate feedback of the turntable's rotation angle and position information, achieving high-precision closed-loop control and significantly improving the turntable's positioning accuracy. The efficient drive system of the motor stator 17 and rotor, combined with a reasonable structural layout, gives the turntable powerful driving torque and fast response capability. In addition, the screw hole 3 design of the bottom fixing seat 1 facilitates installation and fixing. The reasonable setting of functional modules such as the air inlet 8, power interface 6, and encoder interface 7 not only facilitates the connection and debugging of the equipment but also enhances the turntable's versatility and expandability, meeting diverse high-precision rotation application needs and improving the device's practicality. An adjusting spacer 22 is slidably installed in the inner cavity of the outer shell 2, and the adjusting spacer 22 abuts against the motor stator 17. By adjusting the sliding adjustment of the spacer ring 22, the axial position of the motor stator 17 can be precisely controlled, ensuring that the optimal air gap is maintained between the motor stator 17 and the rotor, effectively improving the motor's operating efficiency and stability, reducing energy loss and abnormal vibration caused by installation errors. At the same time, this structure can flexibly adapt to motor stators 17 of different specifications, enhancing the versatility and interchangeability of the turntable components. During assembly and maintenance, staff can easily fine-tune the motor installation accuracy by adjusting the spacer ring 22, reducing assembly difficulty, shortening the debugging cycle, and significantly improving production and maintenance efficiency. This provides a strong guarantee for the reliable operation of the high-precision air-bearing turntable under complex working conditions. The inner wall of the air inlet 8 is slidably connected with a sealing plug 9, the size of which is adapted to the size of the air inlet 8.When the turntable is not in use or is undergoing maintenance, the sealing plug 9 effectively seals the air inlet 8, preventing dust, debris, and other foreign objects from entering the equipment. This avoids airway blockage or contamination of critical components such as the air bearing, ensuring equipment cleanliness and operational reliability. Simultaneously, the sealing plug 9's excellent sealing performance prevents gas leakage, maintaining stable internal airway pressure during equipment downtime and preventing gas loss from affecting the air bearing effect during subsequent use. A rubber ring is fixedly connected to the surface of the outer shell 2, fitting snugly against the rotating table surface 4. The rubber ring possesses good elasticity and sealing properties, effectively blocking external dust, moisture, and other impurities from entering the turntable, preventing contamination or damage to precision components such as the air bearing and encoder, and ensuring a clean operating environment. The lighting source 5 is combined with the light source mounting base 13 and the light source support frame 14. This combined design provides stable lighting conditions for the turntable's operation. The outer shell 2 is made of a high-strength, low-deformation material, which can be one of high-strength alloy structural steel, aluminum alloy, or magnesium alloy. The outer shell 2 is made of high-strength alloy structural steel, aluminum alloy, or magnesium alloy, which has significant advantages. The high-strength alloy structural steel has excellent tensile strength and fatigue resistance, which can withstand the complex stress during the operation of the turntable, ensuring that the outer shell 2 is not easily deformed during long-term use and providing a solid protective barrier for the internal precision components. When aluminum alloy is selected, its lightweight, high strength, and corrosion resistance can reduce the overall weight of the turntable, reduce the difficulty of installation and transportation, and effectively resist environmental erosion, extending the service life of the equipment. The application of magnesium alloy further achieves extreme lightweighting while maintaining good rigidity, reducing the inertia of the turntable and improving the rotational response speed and accuracy.

[0025] Working principle: After the bottom mounting base 1 is fixed to the machine tool table through four screw holes 3, the power interface 6 is connected to the power supply to provide power to the motor stator 17 and motor rotor 18 to provide rotational torque for the rotary platform. The air inlet 8 is connected to an external air source to provide support for the axial air bearing 11 and radial air bearing, allowing the rotary table 4 to rotate freely. The encoder interface 7 is connected to detect the rotation signal of the rotary table. Adjusting the spacer 22 can finely adjust the axial position of the motor stator 17, optimize the air gap with the motor rotor 18, and improve the drive efficiency. At the same time, the encoder body 20 and the encoder disk body 19 monitor the rotation angle in real time. The system feeds data on the position and location back to the control system to achieve high-precision closed-loop control, ensuring accurate positioning of the turntable. When the turntable is not in use or is under maintenance, the sealing plug 9 of the air inlet 8 blocks the air passage to prevent dust and debris from entering and maintain stable internal air pressure. In addition, the outer shell 2 is made of high-strength, low-deformation material to withstand complex stress, providing solid support for the internal structure and ensuring operational stability. The lighting source 5, which is slidably installed on the light source support frame 14 and the light source fixing seat 13, provides stable lighting for the turntable working area, making it easier for operators to observe the equipment's operating status and the processing and measurement process, thus improving operational convenience and work efficiency.

[0026] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

Claims

1. A high-precision air-bearing turntable, including a bottom fixed base (1), characterized in that: The bottom mounting base (1) is fitted with a housing (2). Four screw holes (3) are provided on the surface of the bottom mounting base (1). A rotating platform (4) is mounted on the surface of the housing (2). Two light source support frames (14) are mounted on the surface of the bottom mounting base (1). A light source mounting base (13) is mounted on the surface of the light source support frame (14). An illumination source (5) is slidably mounted on the inner walls of the light source support frame (14) and the light source mounting base (13). A power interface (6) and an encoder interface (7) are fixedly connected to one side of the bottom mounting base (1). An air inlet (8) is provided on one side of the bottom mounting base (1). An axial air bearing (11) is installed in the inner cavity of the housing (2). An air bearing (11) is provided, and a radial air bearing (12) is attached to one side of the axial air bearing (11). A positioning ring (15) is installed on the lower surface of the axial air bearing (11) and the radial air bearing (12). An encoder bracket (21) is installed in the inner cavity of the housing (2). An encoder body (20) is installed on the surface of the encoder bracket (21). An encoder disk body (19) is installed on the surface of the encoder body (20). A motor stator (17) is installed in the inner cavity of the housing (2). A motor rotor (18) is installed on one side of the motor stator. An encoder disk bracket (16) is installed on the surface of the encoder disk body (19). The encoder disk bracket (16) abuts against the positioning ring (15).

2. The high-precision air-bearing turntable according to claim 1, characterized in that: An adjusting spacer (22) is slidably installed in the inner cavity of the outer shell (2), and the adjusting spacer (22) abuts against the motor stator (17).

3. The high-precision air-bearing turntable according to claim 1, characterized in that: The inner wall of the air inlet (8) is slidably connected with a sealing plug (9), the size of which is adapted to the size of the air inlet (8).

4. The high-precision air-bearing turntable according to claim 1, characterized in that: A rubber ring is fixedly connected to the surface of the outer shell (2), and the rubber ring is in contact with the rotating table (4).

5. The high-precision air-bearing turntable according to claim 1, characterized in that: The combined structure of the lighting source (5), the light source mounting base (13), and the light source support frame (14).

6. The high-precision air-bearing turntable according to claim 1, characterized in that: The outer shell (2) is made of a high-strength, low-deformation material, which is made of one of the following materials: high-strength alloy structural steel, aluminum alloy, or magnesium alloy.

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