High-rotating-speed fifth-shaft rotary table structure

Abstract

The utility model provides a high-rotating-speed fifth-shaft rotary table structure which comprises a shell, a first rotating shaft, a second rotating shaft, a third rotating shaft and a fourth rotating shaft. The main shaft is mounted on the four-point contact ball high-speed bearing; the driving motor is installed in the shell, a rotor of the driving motor is installed on the main shaft through a rotor connecting ring, and a stator of the driving motor is installed on the inner wall of the shell; a rear shaft is mounted at the tail part of the main shaft; an encoder rotor is mounted on the rear shaft, an encoder stator is arranged beside the encoder rotor, and the encoder stator is mounted on an encoder seat; and the encoder seat is also provided with a brake system. The high-rotating-speed fifth-axis rotary table structure is compact in structure, excellent in high-speed performance, high in sealing performance, fast in response, high in reliability and easy to maintain, can be widely applied to precision manufacturing equipment such as high-end numerical control machine tools and five-axis linkage machining centers, and has remarkable technical advantages and application prospects.

Description

Technical Field

[0001] This utility model relates to the field of mechanical equipment technology, specifically to a high-speed fifth-axis turntable structure. Background Technology

[0002] In modern machining, automated equipment, and fields requiring high-precision rotational control, such as five-axis CNC machine tools, the fifth-axis rotary table is one of the key components. It is mainly used to provide high-precision rotational motion for workpieces or tools to achieve the machining of complex shapes or specific operational needs. It has a significant impact on machining efficiency, quality, and equipment performance. Therefore, a fifth-axis rotary table structure that can meet the requirements of high speed, high precision, and high reliability is needed.

[0003] The shortcomings of existing technology:

[0004] 1. Poor sealing performance: The existing fifth-axis rotary table lacks effective sealing measures in its structural design, which makes it easy for contaminants such as dust and cutting fluid to enter the bearing and drive motor areas, resulting in accelerated bearing wear, motor failure, reduced service life and operational reliability of the rotary table, and impact on machining accuracy and efficiency.

[0005] 2. Inadequate Braking System: Traditional fifth-axis rotary tables often integrate their braking systems with the drive motor, a design that presents several problems. Firstly, the braking system is inconvenient to install and remove, making it difficult to connect or remove from the rotary table. Secondly, the braking effect and stability need improvement, failing to meet the demands of high-precision machining for rapid and accurate spindle braking. Furthermore, after prolonged use, the durability and reliability of the braking components are insufficient, easily leading to a decline in braking performance, affecting equipment safety and machining quality.

[0006] 3. Insufficient integration and reliability of the overall structure: From the perspective of the overall structure, the coordination and integration between the components of the existing fifth-axis rotary table are not high enough. The layout and installation of some key components such as encoders and braking systems are not reasonable enough. This not only increases the difficulty and cost of assembly, but may also affect the overall performance and reliability of the rotary table due to mutual interference or unstable connection between components. It cannot meet the requirements of high-precision, high-speed and high-stability operation of the fifth-axis rotary table in high-end equipment manufacturing and other fields.

[0007] Therefore, existing technologies have shortcomings and need further improvement. Utility Model Content

[0008] To address the problems existing in the prior art, this utility model provides a high-speed fifth-axis turntable structure.

[0009] To achieve the above objectives, the specific solution of this utility model is as follows:

[0010] This utility model provides a high-speed fifth-axis turntable structure, including:

[0011] The housing has a four-point contact ball high-speed bearing mounted at its front end;

[0012] The front and rear sides of the four-point contact ball high-speed bearing are respectively provided with an upper bearing pressure ring and a lower bearing pressure ring; the upper bearing pressure ring and the lower bearing pressure ring are used to install the four-point contact ball high-speed bearing at the front end of the housing;

[0013] The spindle is mounted on a four-point contact ball high-speed bearing;

[0014] The drive motor is installed inside the housing. The rotor of the drive motor is mounted on the main shaft through a rotor connecting ring, and the stator of the drive motor is mounted on the inner wall of the housing.

[0015] Furthermore, a rear axle is mounted at the tail end of the main shaft.

[0016] Furthermore, an encoder rotor is mounted on the rear axle, an encoder stator is provided next to the encoder rotor, the encoder stator is mounted on an encoder mount, and the encoder mount is mounted on a housing.

[0017] Furthermore, a braking system is also installed on the encoder mount;

[0018] The braking system includes a brake seat, a first brake pad, a second brake pad, a brake cylinder, and a piston;

[0019] The first brake pad is mounted on the rear axle and is located outside the encoder rotor;

[0020] The brake seat is mounted on the encoder seat, and the second brake pad is mounted on the brake seat, with the second brake pad located next to the first brake pad;

[0021] The brake housing is also equipped with a brake cylinder, and a piston is installed inside the brake cylinder. The piston is located outside the second brake pad. When the brake cylinder is inflated, it pushes the piston forward, and the second brake pad approaches and abuts against the first brake pad to achieve braking. The main shaft is stopped rotating by the brake. When the brake cylinder is deflated, the piston retracts, the second brake pad moves away from the first brake pad, the brake is released, and the main shaft resumes rotation.

[0022] Furthermore, a skeleton oil seal is provided between the main shaft and the upper bearing pressure ring to prevent contaminants from entering the bearing and drive motor area.

[0023] Furthermore, the outer casing is equipped with a pressure dynamic balancing device. This device sets a pressure threshold and maintains stable pressure inside and outside the turntable by automatically discharging or drawing in gas, preventing sealing failure caused by overpressure or vacuum.

[0024] Furthermore, the first and second brake pads are made of high-rigidity manganese steel disc brake pads, which have good braking rigidity and strong durability.

[0025] Furthermore, the braking system is independent of the drive motor, which facilitates connecting the braking system to the turntable or removing the braking system from the turntable.

[0026] The technical solution of this utility model has the following beneficial effects:

[0027] 1. Compact structure and strong stability: By installing the drive motor inside the housing, and connecting the rotor to the main shaft and the stator to the inner wall of the housing, the overall structure is compact, which improves the rigidity and stability of the turntable. It can better resist vibration and impact during high-speed operation, ensuring the accuracy of processing or operation.

[0028] 2. High-precision positioning and feedback: The encoder rotor and encoder stator are installed on the rear shaft, which can accurately monitor the rotational position and speed of the spindle, provide accurate feedback signals for the turntable control system, realize high-precision positioning and speed control, and meet the strict position accuracy requirements of complex machining tasks.

[0029] 3. High-efficiency and reliable braking performance: The braking system adopts high-rigidity manganese steel disc brake pads, which have good braking rigidity and strong durability. By controlling the inflation and deflation of the brake cylinder, it can achieve fast and accurate braking and release of the spindle. It can quickly stop the spindle rotation when needed, improve the operation safety of the equipment, and avoid processing errors caused by braking delay or failure.

[0030] 4. Excellent sealing: A skeleton oil seal is installed between the spindle and the upper bearing pressure ring to effectively prevent contaminants such as dust and cutting fluid from entering the bearing and drive motor area, reducing the risk of bearing wear and motor failure, extending the service life of the turntable, reducing maintenance costs, and ensuring long-term stable operation of the equipment.

[0031] 5. Pressure balancing and sealing guarantee: The pressure dynamic balancing device on the outer shell can automatically discharge or draw in gas to maintain stable pressure inside and outside the turntable, prevent seal failure due to overpressure or vacuum, further enhance the sealing performance of the turntable, adapt to different working environments and working conditions, and improve the reliability and adaptability of the equipment.

[0032] 6. Easy to assemble and maintain: The brake system is independent of the drive motor, which makes it easier to install and remove the brake system. It is easy to connect or remove the brake system from the turntable, which simplifies the assembly and maintenance process of the equipment, reduces the difficulty and cost of maintenance, and improves the maintainability of the equipment. Attached Figure Description

[0033] Figure 1 This is a cross-sectional view of the present invention;

[0034] Figure 2 This is a cross-sectional view of the braking system of this utility model;

[0035] Figure 3 This is a perspective view of the braking system of this utility model.

[0036] Attached image captions:

[0037] 1. Main shaft; 2. Oil seal; 3. Upper bearing pressure ring; 4. Four-point contact ball high-speed bearing; 5. Housing; 6. Stator of drive motor; 7. Encoder stator; 8. Encoder mount; 9. Braking system; 10. Rear housing; 11. Lower bearing pressure ring; 12. Rotor connecting ring; 13. Rear shaft; 14. First brake pad; 15. Brake mount; 16. Piston; 17. Brake cylinder; 18. Encoder rotor; 19. Second brake pad; 20. Rotor of drive motor. Detailed Implementation

[0038] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0039] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between 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.

[0040] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0041] In the description of this embodiment, the terms "upper," "lower," "front," "rear," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0042] Combination Figures 1-3 As shown, this utility model provides a high-speed fifth-axis turntable structure, comprising:

[0043] The outer casing 5 has a four-point contact ball high-speed bearing 4 installed at its front end; an upper bearing pressure ring 3 and a lower bearing pressure ring 11 are respectively provided on the front and rear sides of the four-point contact ball high-speed bearing 4; the upper bearing pressure ring 3 and the lower bearing pressure ring 11 are used to install the four-point contact ball high-speed bearing 4 at the front end of the outer casing 5.

[0044] Main spindle 1 is mounted on four-point contact ball high-speed bearing 4;

[0045] The drive motor is installed inside the housing 5. The rotor 20 of the drive motor is mounted on the main shaft 1 through the rotor connecting ring 12, and the stator 6 of the drive motor is mounted on the inner wall of the housing 5.

[0046] A rear shaft 13 is installed at the tail of the main shaft 1.

[0047] An encoder rotor 18 is mounted on the rear axle 13, and an encoder stator 7 is arranged next to the encoder rotor 18. The encoder stator 7 is mounted on an encoder mount 8, and the encoder mount 8 is mounted on the housing 5.

[0048] A braking system 9 is also installed on the encoder mount 8;

[0049] The braking system 9 includes a brake seat 15, a first brake pad 14, a second brake pad 19, a brake cylinder 17, and a piston 16;

[0050] The first brake pad 14 is mounted on the rear axle 13 and is located outside the encoder rotor 18;

[0051] The brake seat 15 is mounted on the encoder seat 8, and the second brake pad 19 is mounted on the brake seat 15. The second brake pad 19 is located next to the first brake pad 14.

[0052] A brake cylinder 17 is also installed on the brake seat 15. A piston 16 is provided inside the brake cylinder 17. The piston 16 is located outside the second brake pad 19. When the brake cylinder 17 is inflated, it pushes the piston 16 forward, and the second brake pad 19 approaches and abuts against the first brake pad 14 to achieve braking. The main shaft 1 is stopped from rotating by the brake. When the brake cylinder 17 is deflated, the piston 16 retracts, and the second brake pad 19 moves away from the first brake pad 14. The brake is released, and the main shaft 1 resumes rotation.

[0053] A skeleton oil seal 2 is also provided between the main shaft 1 and the upper bearing pressure ring 3 to prevent contaminants from entering the bearing and drive motor area.

[0054] The outer casing 5 is equipped with a pressure dynamic balancing device. This device sets a pressure threshold and maintains stable pressure inside and outside the turntable by automatically discharging or drawing in gas, preventing sealing failure caused by overpressure or vacuum.

[0055] The first brake pad 14 and the second brake pad 19 are made of high-rigidity manganese steel disc brake pads, which have good braking rigidity and strong durability.

[0056] The braking system 9 is independent of the drive motor, which makes it easy to connect the braking system 9 to the turntable or remove the braking system 9 from the turntable.

[0057] The principle of this utility model is as follows:

[0058] Drive and rotation principle

[0059] Drive motor operation: The drive motor is installed inside the housing 5, and its stator 6 is fixed to the inner wall of the housing 5. The rotor 20 of the drive motor is fixedly mounted on the main shaft 1 through the rotor connecting ring 12. When the drive motor is powered on, the stator 6 of the drive motor generates a magnetic field, which interacts with the windings in the rotor 20 of the drive motor, causing the rotor to rotate, thereby driving the main shaft 1 to rotate, realizing the rotational movement of the turntable.

[0060] Bearing support: The spindle 1 is mounted on a four-point contact ball high-speed bearing 4. This bearing can withstand loads from all directions, including axial and radial loads, ensuring the stability and accuracy of the spindle 1 during high-speed rotation. The upper bearing retainer ring 3 and the lower bearing retainer ring 11 secure the four-point contact ball high-speed bearing 4 to the front end of the housing 5, providing robust support.

[0061] Encoding and Braking Principles

[0062] Encoder monitoring: A rear shaft 13 is installed at the tail of the main shaft 1, and an encoder rotor 18 is mounted on the rear shaft 13. The encoder stator 7 is mounted on the encoder mount 8, which is fixed to the housing 5. When the main shaft 1 rotates, the encoder rotor 18 rotates accordingly. The encoder stator 7 detects the position change of the rotor, thereby accurately measuring the rotation angle and speed of the main shaft 1 and feeding this information back to the control system to achieve precise control of the rotary table's rotation position and speed.

[0063] Braking system 9 is also installed on the encoder housing 8. Braking system 9 includes a brake housing 15, a first brake pad 14, a second brake pad 19, a brake cylinder 17, and a piston 16. The first brake pad 14 is mounted on the rear shaft 13, located outside the encoder rotor 18; the second brake pad 19 is mounted on the brake housing 15, located next to the first brake pad 14. When the brake cylinder 17 is inflated, the piston 16 pushes forward, and the second brake pad 19 approaches and abuts against the first brake pad 14, generating friction to stop the rotation of the main shaft 1, thus achieving the braking function; when the brake cylinder 17 is deflated, the piston 16 retracts, the second brake pad 19 moves away from the first brake pad 14, the brake is released, and the main shaft 1 resumes rotation.

[0064] Sealing and pressure balance principle

[0065] Sealing and protection: A skeleton oil seal 2 is provided between the spindle 1 and the upper bearing pressure ring 3 to prevent contaminants such as dust and cutting fluid from entering the bearing and drive motor area, protect the normal operation of internal components, and extend service life.

[0066] Pressure balance: The outer casing 5 is equipped with a pressure dynamic balancing device. This device can be set with a pressure threshold and maintains stable pressure inside and outside the turntable by automatically discharging or drawing in gas, preventing sealing failure due to overpressure or vacuum, and ensuring reliable operation of the turntable under different working environments.

[0067] The above description is only a preferred embodiment of the present utility model and does not limit the scope of the present utility model. All equivalent structural transformations made under the present utility model concept and based on the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the protection scope of the present utility model.

Claims

1. A high-speed fifth-axis turntable structure, characterized in that, include: The housing has a four-point contact ball high-speed bearing mounted at its front end; The front and rear sides of the four-point contact ball high-speed bearing are respectively provided with an upper bearing pressure ring and a lower bearing pressure ring; the upper bearing pressure ring and the lower bearing pressure ring are used to install the four-point contact ball high-speed bearing at the front end of the housing; The spindle is mounted on a four-point contact ball high-speed bearing; The drive motor is installed inside the housing. The rotor of the drive motor is mounted on the main shaft through a rotor connecting ring, and the stator of the drive motor is mounted on the inner wall of the housing.

2. The high-speed fifth-axis turntable structure according to claim 1, characterized in that, A rear axle is mounted at the tail of the main shaft.

3. The high-speed fifth-axis turntable structure according to claim 2, characterized in that, An encoder rotor is mounted on the rear axle, and an encoder stator is located next to the encoder rotor. The encoder stator is mounted on an encoder mount, which is mounted on a housing.

4. The high-speed fifth-axis turntable structure according to claim 3, characterized in that, A braking system is also installed on the encoder mount; The braking system includes a brake seat, a first brake pad, a second brake pad, a brake cylinder, and a piston; The first brake pad is mounted on the rear axle and is located outside the encoder rotor; The brake seat is mounted on the encoder seat, and the second brake pad is mounted on the brake seat, with the second brake pad located next to the first brake pad; The brake housing is also equipped with a brake cylinder, and a piston is installed inside the brake cylinder. The piston is located outside the second brake pad. When the brake cylinder is inflated, it pushes the piston forward, and the second brake pad approaches and abuts against the first brake pad to achieve braking. The main shaft is stopped rotating by the brake. When the brake cylinder is deflated, the piston retracts, the second brake pad moves away from the first brake pad, the brake is released, and the main shaft resumes rotation.

5. The high-speed fifth-axis turntable structure according to claim 1, characterized in that, A skeleton oil seal is also provided between the main shaft and the upper bearing pressure ring to prevent contaminants from entering the bearing and drive motor area.

6. The high-speed fifth-axis turntable structure according to claim 1, characterized in that, The outer casing is equipped with a pressure dynamic balancing device. This device sets a pressure threshold and maintains stable pressure inside and outside the turntable by automatically discharging or drawing in gas, preventing sealing failure caused by overpressure or vacuum.

7. The high-speed fifth-axis turntable structure according to claim 4, characterized in that, The first and second brake pads are made of high-rigidity manganese steel disc brake pads, which have good braking rigidity and strong durability.

8. The high-speed fifth-axis turntable structure according to claim 4, characterized in that, The braking system is independent of the drive motor, which makes it easy to connect the braking system to the turntable or remove the braking system from the turntable.

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