Direct-drive C-axis numerical control rotary table

Abstract

The utility model provides a direct-drive C-axis numerical control rotary table. The direct-drive C-axis numerical control rotary table comprises a shell, a main shaft, a motor and a flange plate, the motor is installed in the shell, and the main shaft is installed in the motor. A crossed roller bearing is further arranged at the front end of the main shaft, an outer ring of the crossed roller bearing is installed on the shell, an inner ring of the crossed roller bearing is installed on the main shaft, and a flange plate is located on the front side of the crossed roller bearing and installed at the front end of the main shaft; a stator of the motor is installed on the shell, and a rotor of the motor is installed on the main shaft. And a tail shaft is also arranged at the tail end of the main shaft. According to the direct-drive C-axis numerical control rotary table, through the technical means of direct-drive design, the high-precision bearing, the pneumatic brake system, the surface treatment technology and the like, the transmission precision, the dynamic performance, the brake effect and the reliability of the numerical control rotary table are remarkably improved, meanwhile, the structure is compact, maintenance is easy and convenient, and the requirement for high-precision and high-performance numerical control machining can be met.

Description

Technical Field

[0001] This utility model relates to the field of automation equipment technology, specifically to a direct-drive C-axis CNC rotary table. Background Technology

[0002] A direct-drive C-axis CNC rotary table is a high-precision rotating component used in CNC machine tools and is widely used in the machining of various complex parts. Traditional CNC rotary tables typically use indirect drive methods, such as gear transmission or belt transmission. While these methods can achieve rotation, they have certain limitations in terms of accuracy, dynamic performance, and structural compactness. With the development of CNC machining technology, higher requirements have been placed on the accuracy, response speed, and reliability of CNC rotary tables. Therefore, a new type of direct-drive C-axis CNC rotary table is needed to meet these requirements.

[0003] The shortcomings of existing technology:

[0004] 1. Transmission accuracy issues:

[0005] Traditional CNC rotary tables mostly use indirect transmission methods (such as gear transmission), which have a long transmission chain and are prone to transmission backlash and error accumulation, making it difficult to further improve rotational accuracy and meet the needs of high-precision machining.

[0006] Indirect transmission methods have low transmission efficiency and high energy loss, which affects processing efficiency and overall equipment performance.

[0007] 2. Issues related to structural complexity and compactness:

[0008] Traditional CNC rotary tables contain multiple transmission components (such as reducers and gears), have a complex structure, occupy a large space, and are not conducive to the overall layout and miniaturization of machine tools.

[0009] The complex structure increases manufacturing costs and maintenance difficulty, and many mechanical parts are prone to wear and tear, requiring regular lubrication and maintenance, which increases equipment maintenance costs and downtime.

[0010] 3. Braking system problems:

[0011] Traditional CNC rotary tables typically use electromagnetic or mechanical braking systems, which are not ideal in terms of braking effect, braking torque, or braking accuracy, making it difficult to meet the needs of precise control of the stop position or emergency braking.

[0012] The braking system has low reliability and is prone to failure during long-term use, which increases the maintenance cost and downtime of the equipment.

[0013] 4. Abrasion resistance and reliability issues:

[0014] The surface treatment of braking components (such as brake discs and brake pads) of traditional CNC rotary tables is not perfect, and their wear resistance is poor. They are prone to wear, which can lead to a decrease in braking performance and affect the service life and reliability of the equipment.

[0015] The surface treatment process of the braking components is not advanced enough, which cannot effectively improve their corrosion resistance and fatigue resistance, further affecting the long-term stable operation of the equipment.

[0016] Therefore, existing technologies have shortcomings and need further improvement. Utility Model Content

[0017] In view of the problems existing in the prior art, this utility model provides a direct drive C-axis CNC rotary table.

[0018] To achieve the above objectives, the specific solution of this utility model is as follows:

[0019] This utility model provides a direct-drive C-axis CNC rotary table, comprising:

[0020] Housing, spindle, motor, flange;

[0021] The motor is installed inside the housing, and the main shaft is installed inside the motor;

[0022] The front end of the main shaft is also provided with a crossed roller bearing. The outer ring of the crossed roller bearing is mounted on the housing, the inner ring of the crossed roller bearing is mounted on the main shaft, and the flange is located on the front side of the crossed roller bearing and mounted on the front end of the main shaft.

[0023] The stator of the motor is mounted on the housing, and the rotor of the motor is mounted on the main shaft;

[0024] The tail end of the main shaft is also provided with a tail shaft.

[0025] Furthermore, a positioning ring is provided at the front end of the spindle, and the flange is mounted on the positioning ring.

[0026] Furthermore, an encoder rotor is mounted on the tail shaft, and the encoder rotor rotates synchronously with the main shaft;

[0027] An encoder stator mount is installed on the housing, and the encoder stator is mounted on the encoder stator mount;

[0028] The encoder stator is located next to the encoder rotor. The rotation of the main shaft drives the encoder rotor on the tail shaft to rotate, and the encoder stator detects the rotation of the encoder rotor.

[0029] Furthermore, it also includes a cylinder;

[0030] The cylinder is mounted on the outer casing, and a brake connector is also mounted on the cylinder;

[0031] Brake pads are installed on the brake connector;

[0032] A brake disc is also installed on the tail shaft on the outside of the encoder rotor.

[0033] The brake pads are located on the side of the brake disc closest to the flange;

[0034] The piston of the cylinder is located on the side of the brake pad closer to the flange;

[0035] The cylinder pushes the piston, which in turn pushes the brake pads to come into contact with the brake discs to perform braking.

[0036] When the piston in the cylinder retracts, the brake pads move away from the brake discs, and the brakes are released.

[0037] Furthermore, another brake clip is also installed on the brake connector, so that a brake clip is provided on each side of the brake disc.

[0038] Furthermore, an end cap is also installed on the brake connector, and the end cap is located on the outside of the end of the tail shaft.

[0039] Furthermore, the surfaces of the brake discs and brake pads are provided with sandblasting and nickel plating coatings.

[0040] The technical solution of this utility model has the following beneficial effects:

[0041] 1. High-precision transmission

[0042] Direct drive design: The motor rotor is directly mounted on the main shaft, eliminating the transmission backlash and error accumulation problems in traditional transmission methods (such as gear transmission), and significantly improving transmission accuracy.

[0043] Crossed roller bearings: The front end of the spindle adopts crossed roller bearings, which have a compact structure, high rigidity, and high precision. They can effectively reduce the radial and axial runout of the spindle and further improve the rotational accuracy.

[0044] 2. Compact structure and high reliability

[0045] Integrated design: The motor is directly installed inside the housing, and the spindle runs through the motor. The overall structure is compact, reducing space occupation and facilitating the overall layout and miniaturization design of the machine tool.

[0046] Locating ring design: A locating ring is set at the front end of the spindle, and the flange is installed on the locating ring. This structural design can improve the installation accuracy and stability of the flange and enhance the reliability of the overall structure.

[0047] 3. Precise braking control

[0048] Pneumatic braking system: The system uses a cylinder to drive the brake pads to contact the brake disc for braking. It has a large braking torque and high braking accuracy, and can achieve fast and reliable braking, meeting the strict requirements for stopping position in high-precision machining.

[0049] Dual brake pad design: Brake pads are installed on both sides of the brake disc, which further improves braking torque and braking stability, and enhances the reliability of the braking system.

[0050] End cap protection: An end cap is installed on the brake connector to protect the brake components from external contamination and mechanical damage, thus extending the service life of the brake system.

[0051] 4. High wear resistance and corrosion resistance

[0052] Surface treatment process: The surfaces of brake discs and brake pads are treated with sandblasting and nickel plating, which significantly improves surface hardness, wear resistance and corrosion resistance, extends the service life of braking components and reduces maintenance costs. Attached Figure Description

[0053] Figure 1 This is a cross-sectional view of the present invention;

[0054] Figure 2 This is a schematic diagram of a three-piece disc brake consisting of brake pads and brake discs according to this utility model.

[0055] Attached image captions:

[0056] 1. Flange; 2. Locating ring; 3. Crossed roller bearing; 4. Housing; 5. Main shaft; 6. Motor stator; 7. Motor rotor; 8. Tail shaft; 9. Encoder stator mount; 10. Encoder rotor; 11. Encoder stator; 12. Cylinder; 13. Brake connector; 14. Piston; 15. End cover; 16. Brake clip; 17. Brake disc. Detailed Implementation

[0057] 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, and not the entire structure.

[0058] 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.

[0059] 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.

[0060] 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.

[0061] Combination Figures 1-2 As shown, this utility model provides a direct-drive C-axis CNC rotary table, comprising:

[0062] 4. Housing; 5. Spindle; 1. Motor; 1. Flange.

[0063] The motor is installed inside the housing 4, and the main shaft 5 is installed in the motor;

[0064] The front end of the main shaft 5 is also provided with a cross roller bearing 3. The outer ring of the cross roller bearing 3 is mounted on the housing 4, and the inner ring of the cross roller bearing 3 is mounted on the main shaft 5. The flange 1 is located on the front side of the cross roller bearing 3 and is mounted on the front end of the main shaft 5.

[0065] The stator 6 of the motor is mounted on the housing 4, and the rotor 7 of the motor is mounted on the main shaft 5;

[0066] The tail end of the main shaft 5 is also provided with a tail shaft 8.

[0067] The front end of the main shaft 5 is also provided with a positioning ring 2, and the flange 1 is mounted on the positioning ring 2.

[0068] An encoder rotor 10 is mounted on the tail shaft 8, and the encoder rotor 10 rotates synchronously with the main shaft 5.

[0069] An encoder stator mount 9 is mounted on the housing 4, and the encoder stator 11 is mounted on the encoder stator mount 9;

[0070] The encoder stator 11 is located next to the encoder rotor 10. The rotation of the main shaft 5 drives the encoder rotor 10 on the tail shaft 8 to rotate, and the encoder stator 11 detects the rotation of the encoder rotor 10.

[0071] It also includes a cylinder 12;

[0072] The cylinder 12 is mounted on the housing 4, and a brake connecting seat 13 is also mounted on the cylinder 12;

[0073] Brake clips 16 are installed on the brake connector 13;

[0074] A brake disc 17 is also installed on the tail shaft 8 on the outside of the encoder rotor 10.

[0075] The brake pad 16 is located on the side of the brake disc 17 closest to the flange 1;

[0076] The piston 14 of the cylinder 12 is located on the side of the brake pad 16 near the flange 1;

[0077] The cylinder 12 pushes the piston 14, which in turn pushes the brake pad 16 to abut against the brake disc 17 to perform braking.

[0078] When the piston 14 of cylinder 12 retracts, the brake pad 16 moves away from the brake disc 17, and the brake is released.

[0079] Another brake clip 16 is also installed on the brake connector 13, so that a brake clip 16 is provided on each side of the brake disc 17.

[0080] An end cap 15 is also installed on the brake connector 13, and the end cap 15 is located on the outer side of the end of the tail shaft 8.

[0081] The surfaces of the brake disc 17 and brake pad 16 are provided with sandblasting and nickel plating coatings.

[0082] The principle of this utility model is as follows:

[0083] The working principle of the direct-drive C-axis CNC rotary table of this invention can be divided into the following key parts:

[0084] 1. Driving principle

[0085] Direct drive motor drive:

[0086] The stator 6 of the motor is fixed to the housing 4, and the rotor 7 of the motor is mounted on the main shaft 5. When the motor is powered on, the rotor 7 rotates under the influence of the magnetic field, directly driving the main shaft 5 to rotate.

[0087] This direct-drive method eliminates the intermediate links in traditional transmission methods (such as gear transmission), reduces transmission errors and backlash, and improves transmission accuracy and dynamic performance.

[0088] 2. Support and Positioning Principles

[0089] Crossed roller bearing 3 supports:

[0090] A crossed roller bearing 3 is mounted at the front end of the spindle 5. Its outer ring is fixed to the housing 4, and its inner ring is mounted on the spindle 5. The crossed roller bearing 3 has the characteristics of high rigidity and high precision, which can effectively support the spindle 5 and reduce radial and axial runout.

[0091] Flange 1 is installed at the front end of spindle 5 via positioning ring 2. Positioning ring 2 ensures the installation accuracy and stability of flange 1, further improving the overall positioning accuracy.

[0092] 3. Position feedback principle

[0093] Encoder detection:

[0094] An encoder rotor 10 is mounted on the tail shaft 8, and the encoder rotor 10 rotates synchronously with the main shaft 5.

[0095] The encoder stator 11 is mounted in the encoder stator mount 9 on the housing 4. The stator is located next to the rotor and is used to detect the rotation of the rotor.

[0096] When the spindle 5 rotates, the encoder rotor 10 rotates accordingly. The encoder stator 11 converts the rotor's rotation information into an electrical signal and feeds it back to the CNC system to achieve high-precision position control.

[0097] 4. Braking Principle

[0098] Pneumatic braking system:

[0099] Cylinder 12 is mounted on housing 4, and brake connector 13 is mounted on cylinder 12. Brake clip 16 is mounted on brake connector 13.

[0100] A brake disc 17 is mounted on the tail shaft 8 on the outside of the encoder rotor 10. A brake clip 16 is located on the side of the brake disc 17 near the flange 1. The piston 14 of the cylinder 12 is located on the side of the brake clip 16 near the flange 1.

[0101] When braking is required, cylinder 12 pushes piston 14, and piston 14 pushes brake pad 16 to abut against brake disc 17, generating braking torque and stopping the main shaft 5 from rotating.

[0102] When the brake needs to be released, the piston 14 of cylinder 12 retracts, the brake pad 16 moves away from the brake disc 17, and the main shaft 5 can rotate freely.

[0103] Dual brake pad design (16 pads):

[0104] A brake pad 16 is provided on each side of the brake disc 17, which further improves the braking torque and braking stability.

[0105] End cap 15 protection:

[0106] An end cover 15 is installed on the brake connector 13. The end cover 15 is located on the outside of the end of the tail shaft 8 and serves to protect the brake components and prevent external contamination and mechanical damage.

[0107] 5. Surface treatment and abrasion resistance

[0108] Brake component surface treatment:

[0109] The surfaces of the brake disc 17 and brake pad 16 are sandblasted and nickel-plated, which improves surface hardness, wear resistance and corrosion resistance, extends the service life of brake components and reduces maintenance costs.

[0110] Comprehensive working principle

[0111] start up:

[0112] When the motor is powered on, the rotor rotates, which directly drives the main shaft 5 to rotate.

[0113] The encoder rotor 10 rotates synchronously with the main shaft 5, and the encoder stator 11 detects the rotation of the rotor and feeds back the position information to the CNC system to achieve high-precision control.

[0114] run:

[0115] The spindle 5 rotates smoothly under the drive of the motor, and the crossed roller bearing 3 provides high-precision support to ensure the stable operation of the spindle 5.

[0116] The encoder continuously provides position information, and the CNC system adjusts the motor speed and position in real time based on the feedback signal to ensure machining accuracy.

[0117] brake:

[0118] When a stop is required, the cylinder 12 is vented, and the piston 14 pushes the brake pad 16 to abut against the brake disc 17, generating a braking torque that causes the main shaft 5 to stop quickly.

[0119] After braking is completed, cylinder 12 exhausts air, piston 14 retracts, brake pads 16 are released, and main shaft 5 can be restarted.

[0120] Protection and maintenance:

[0121] The brake components are treated with sandblasting and nickel plating to improve wear resistance and corrosion resistance. The end cap 15 protects the brake components from external contamination, extends service life, and reduces maintenance costs.

[0122] Based on the above working principle, the direct-drive C-axis CNC rotary table of this invention achieves high precision, high dynamic performance, high reliability and fast braking, and is suitable for high-precision CNC machining scenarios.

[0123] 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 direct drive C-axis numerically controlled rotary table, characterized by, include: Housing, spindle, motor, flange; The motor is installed inside the housing, and the main shaft is installed inside the motor; The front end of the main shaft is also provided with a crossed roller bearing. The outer ring of the crossed roller bearing is mounted on the housing, the inner ring of the crossed roller bearing is mounted on the main shaft, and the flange is located on the front side of the crossed roller bearing and mounted on the front end of the main shaft. The stator of the motor is mounted on the housing, and the rotor of the motor is mounted on the main shaft; The tail end of the main shaft is also provided with a tail shaft.

2. The direct-drive C-axis CNC rotary table according to claim 1, characterized in that, A positioning ring is also provided at the front end of the spindle, and the flange is mounted on the positioning ring.

3. The direct-drive C-axis CNC rotary table according to claim 1, characterized in that, An encoder rotor is mounted on the tail shaft, and the encoder rotor rotates synchronously with the main shaft. An encoder stator mount is installed on the housing, and the encoder stator is mounted on the encoder stator mount; The encoder stator is located next to the encoder rotor. The rotation of the main shaft drives the encoder rotor on the tail shaft to rotate, and the encoder stator detects the rotation of the encoder rotor.

4. The direct-drive C-axis CNC rotary table according to claim 3, characterized in that, It also includes a cylinder; The cylinder is mounted on the outer casing, and a brake connector is also mounted on the cylinder; Brake pads are installed on the brake connector; A brake disc is also installed on the tail shaft on the outside of the encoder rotor. The brake pads are located on the side of the brake disc closest to the flange; The piston of the cylinder is located on the side of the brake pad closer to the flange; The cylinder pushes the piston, which in turn pushes the brake pads to come into contact with the brake discs to perform braking. When the piston in the cylinder retracts, the brake pads move away from the brake discs, and the brakes are released.

5. The direct-drive C-axis CNC rotary table according to claim 4, characterized in that, Another brake pad is also installed on the brake connector, so that a brake pad is provided on each side of the brake disc.

6. The direct-drive C-axis CNC rotary table according to claim 4, characterized in that, The brake connector is also equipped with an end cap, which is located on the outside of the end of the tail shaft.

7. The direct-drive C-axis CNC rotary table according to claim 4, characterized in that, The surfaces of the brake discs and brake pads are coated with sandblasting and nickel plating.

Images