Numerical control rotary table with brake device

Abstract

The application discloses a numerical control rotary table with a brake device, which comprises a rotary table box body, a motor power part, a rotating part and an electromagnetic power-off brake part. The motor power part is fixed on one side of the rotary table box body. The rotating part is arranged on the rotary table box body and is in transmission connection with the motor power part. The electromagnetic power-off brake part is arranged between the rotating part and the rotary table box body and is used for switching the rotating state of the rotating part by on-off power. The rotating part is braked by the electromagnetic power-off brake part, so that the precision of the stop position of the equipment can be improved. In the power-off state, the rotating of the rotating part is limited, so that the automatic movement of the equipment due to gravity when power failure is avoided, and the safety hidden danger is reduced. Meanwhile, the rollers on the rotating part are engaged by the cam in the motor power part, so that the accurate indexing rotation of the rotating part is realized.

Description

Technical Field

[0001] This invention relates to the technical field of rotary table equipment, and in particular to the technical field of a CNC rotary table with a braking device. Background Technology

[0002] Rotary tables are commonly used indexing and rotary devices in automated production lines, machining centers, and assembly equipment. They are used to drive workpieces or tooling to rotate precisely between multiple workstations to achieve workpiece transport, positioning, and processing. The indexing accuracy and stopping position accuracy of the rotary table directly affect the processing quality and production efficiency of the entire production line. Existing rotary tables typically use a motor in conjunction with a cam-based indexing mechanism to drive the rotating part to rotate at an indexing position, and brake it when the rotating part stops to maintain the stopping position. Currently, rotary table braking is mostly achieved through pneumatic or hydraulic braking. However, both pneumatic and hydraulic braking require corresponding air or oil circuits, and hydraulic braking also requires an additional hydraulic power unit, resulting in a complex overall structure and large space occupation. At the same time, there is a risk of leakage in the air and oil circuits during long-term use. Once insufficient air pressure or hydraulic oil leakage occurs, it will directly affect the braking effect. Furthermore, the existence of air circuits, oil circuits, and hydraulic power units also makes the later maintenance of the equipment more complicated.

[0003] Furthermore, existing rotary tables use gas or hydraulic oil as the power medium for braking, resulting in slow braking response and low accuracy in the stopping position of the rotating part, making it difficult to meet the requirements of high-precision indexing. When the equipment suddenly loses power, the rotating part is prone to automatic rotation under the influence of gravity or load inertia, which may cause workpiece displacement, equipment damage, or even personal injury, posing a safety hazard. In addition, the rotary table usually requires lubricating oil to lubricate the transmission components such as cams, rollers, and bearings. If the sealing measures are not adequate, lubricating oil can easily seep into the braking components or leak from the housing connection, affecting the braking effect and the cleanliness of the equipment. Summary of the Invention

[0004] The purpose of this invention is to solve the problems in the prior art by proposing a CNC rotary table with a braking device, which solves the problems of complex braking structure, large space occupation, leakage risk of air and oil circuits during long-term use, and cumbersome maintenance in the later stage of traditional rotary table.

[0005] To achieve the above objectives, the present invention proposes a CNC rotary table with a braking device, comprising a rotary table housing, a motor power unit, a rotating part, and an electromagnetic power-off braking unit. The motor power unit is fixedly mounted on one side of the rotary table housing, and the rotating part is mounted on the rotary table housing. The rotating part is connected to the motor power unit in a transmission manner. An electromagnetic power-off braking unit is provided between the rotating part and the rotary table housing, which controls the rotation state of the rotating part by switching on and off the power.

[0006] Preferably, the turntable housing has a lubricating oil inlet and outlet on its side, and the lubricating oil inlet and outlet are connected to a sealing bolt by a thread.

[0007] Preferably, the electromagnetic de-energizing brake restricts the rotation of the rotating part when the power is off, and allows the rotating part to rotate freely when the power is on.

[0008] Preferably, the motor power unit includes a servo motor, which is fixed to the turntable housing by bolts. The servo motor is connected to the rotating part for transmission. The output end of the servo motor is provided with a cam, and the servo motor is connected to the rotating part for transmission through the cam.

[0009] Preferably, a motor protective cover is also included, which covers the servo motor.

[0010] Preferably, the rotating part includes a rotating shaft, rollers, and bearings. Rollers are arranged around the rotating shaft and mesh with a cam. A bearing is arranged between the rotating shaft and the turntable housing.

[0011] Preferably, the electromagnetic power-off braking unit includes an electromagnetic base, a coil, a brake piston, a brake pad, and a brake spring. The electromagnetic base is fixed to the turntable housing, and the brake pad is fixed to the rotating part. The electromagnetic base is provided with a brake piston that can slide back and forth between the electromagnetic base and the brake pad to control the rotation state of the brake pad. A brake spring is provided between the brake piston and the electromagnetic base to push the brake piston toward the brake pad to stop the brake pad. The electromagnetic base is provided with a coil to overcome the elastic force of the brake spring through electromagnetic attraction so that the brake piston moves away from the brake pad.

[0012] Preferably, the electromagnetic base is provided with an oil seal to limit the contact between the lubricating oil and the brake piston and brake pads.

[0013] Preferably, a sealing ring is provided between the electromagnetic base and the turntable housing, and an inner oil seal is provided between the turntable housing and the rotating part.

[0014] Preferably, the cam is an arc-shaped cam, which meshes with the rotating part to drive the rotating part to perform indexing rotation.

[0015] Preferably, the bearing is a crossed roller bearing; an angle encoder is provided at the end of the rotating shaft, and the angle encoder is electrically connected to the control system to perform closed-loop position feedback control on the indexing rotation of the rotating part.

[0016] Preferably, there are multiple brake pistons and brake springs evenly distributed around the circumference of the electromagnetic base; the electromagnetic base is provided with a guide structure that guides the brake piston axially and restricts its circumferential rotation; the brake spring is a compression spring; and a friction lining is provided on the braking surface of the brake pad.

[0017] Preferably, the brake piston and the brake pads are located in a dry braking chamber formed by the oil seal.

[0018] Preferably, it also includes a safety anti-jamming lock that works in conjunction with the electromagnetic power-off brake to prevent the equipment from moving passively under a large load. The safety anti-jamming lock includes a limiting cutter disc, a limiting plate, a safety pin, a fixed magnet, a telescopic hole, and a movable magnet. The limiting cutter disc is fixed to the end of the rotating part. The limiting plate is fixed to the turntable housing. The limiting plate is provided with a telescopic hole. The bottom of the telescopic hole is fixed with a fixed magnet. A safety pin is movably disposed in the telescopic hole. The end of the safety pin facing the fixed magnet is fixed with a movable magnet that attracts the fixed magnet and repels the coil. The side of the limiting cutter disc facing the turntable housing is provided with a cutting groove that cooperates with the telescopic hole.

[0019] The beneficial effects of this invention are as follows: This invention uses an electromagnetic power-off braking unit to brake the rotating part. Compared with traditional pneumatic or hydraulic braking, the structure is simpler and more compact, and the later maintenance of the equipment is easier. Since the braking force is directly generated by the electromagnetic force and the elastic force of the braking spring, there is no need to use gas or hydraulic oil as a power medium. Its braking response time is better than that of pneumatic and hydraulic braking, which can quickly brake the rotating part and improve the accuracy of the equipment's stopping position. Attached Figure Description The above and other features, properties and advantages of the present invention will become more apparent from the following description taken in conjunction with the accompanying drawings and embodiments, in which the same reference numerals always denote the same features, wherein: Figure 1 This is a right-view perspective three-dimensional schematic diagram of a CNC rotary table with a braking device according to the present invention; Figure 2 This is a left-view perspective three-dimensional schematic diagram of a CNC rotary table with a braking device according to the present invention; Figure 3 This is an exploded view of a CNC rotary table with a braking device according to the present invention; Figure 4 This is a three-dimensional schematic diagram of the rotating part; Figure 5 This is a schematic diagram of the electromagnetic power-off braking unit; Figure 6 This is an exploded view of the electromagnetic de-energizing brake unit; Figure 7 This is a diagram illustrating the safety features of preventing jamming and deadlock. Figure 8 This is an exploded view of the safety anti-lock mechanism; Figure 9 This is an exploded view of the safety anti-lock mechanism; Figure 10 yes Figure 9 A magnified view of part A in the middle.

[0020] In the diagram: 1-Turntable housing, 2-Motor power unit, 21-Servo motor, 22-Motor protective cover, 3-Rotating part, 31-Rotating shaft, 32-Roller, 33-Bearing, 34-Bearing seat, 4-Electromagnetic power-off brake unit, 41-Electromagnetic seat, 42-Inner oil seal, 43-Coil, 44-Brake piston, 45-Brake pad, 46-Sealing ring, 47-Oil seal, 48-Brake spring, 5-Safety anti-jamming lock, 51-Limit cutting disc, 511-Cutting groove, 52-Limit disc, 53-Safety pin, 54-Fixed magnet, 55-Telescopic hole, 56-Moving magnet.

[0021] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0022] It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0023] See Figures 1-3 This invention discloses a CNC rotary table with a braking device, comprising a rotary table housing 1, a motor power unit 2, a rotating part 3, and an electromagnetic power-off brake unit 4. The motor power unit 2 is fixedly mounted on one side of the rotary table housing 1, and the rotating part 3 is mounted on the rotary table housing 1. The rotating part 3 is connected to the motor power unit 2 via a transmission connection, and the motor power unit 2 drives the rotating part 3 to rotate. The electromagnetic power-off brake unit 4 is disposed between the rotating part 3 and the rotary table housing 1. The electromagnetic power-off brake unit 4 is used to control the rotation state of the rotating part 3 by switching power on and off. The electromagnetic power-off brake unit 4 can quickly brake the rotating part 3, improving the accuracy of the equipment's stopping position.

[0024] like Figure 3 As shown, the motor power unit 2 includes a servo motor 21, which is bolted to the turntable housing 1 and is connected to the rotating part 3 via a transmission connection. The servo motor 21 and the rotating part 3 can be connected via gear transmission or via pulleys and a transmission belt. A cam is provided at the output end of the servo motor 21; the servo motor 21 drives the cam to rotate, and the cam then drives the rotating part 3 to rotate. The motor power unit 2 also includes a motor protective cover 22, which covers the servo motor 21 to protect it.

[0025] In this embodiment, the cam is an arc-shaped cam, and the profile of the arc-shaped cam meshes with multiple rollers 32 in sequence to form a cam dividing mechanism, thereby driving the rotating shaft 31 to perform high-precision indexing rotation.

[0026] like Figure 4As shown, the rotating part 3 includes a shaft 31, rollers 32, and bearings 33. Multiple rollers 32 are arranged around the shaft 31. The rollers 32 mesh with a cam in the motor power unit 2. When the cam rotates, it drives the shaft 31 to rotate through meshing with the rollers 32, thereby achieving the indexing rotation of the rotating part 3. A bearing 33 is provided between the shaft 31 and the turntable housing 1. The bearing 33 is installed in a bearing seat 34, which is fixed to the turntable housing 1. The shaft 31 is supported for rotation by the bearing seat 34 and the bearing 33. Figure 5 and Figure 6 As shown, the electromagnetic de-energizing brake unit 4 includes an electromagnetic base 41, a coil 43, a brake piston 44, a brake pad 45, and a brake spring 48. The electromagnetic base 41 is fixed on the turntable housing 1, and the brake pad 45 is fixed on the rotating part 3. The brake piston 44 is mounted on the electromagnetic base 41 and can slide back and forth between the electromagnetic base 41 and the brake pad 45 to control the rotation state of the brake pad 45. A brake spring 48 is mounted between the brake piston 44 and the electromagnetic base 41. The brake spring 48 is used to push the brake piston 44 towards the brake pad 45 to stop the brake pad 45. The brake pad 45 described in this application is made of manganese steel, which has greater strength and longer life than the resin-based material used in traditional brake pads 45. The coil 43 is mounted on the electromagnetic base 41 and is used to overcome the elastic force of the brake spring 48 through electromagnetic attraction to move the brake piston 44 away from the brake pad 45.

[0027] Furthermore, the bearing 33 is a crossed roller bearing, with its inner ring fixedly connected to the rotating shaft 31 and its outer ring fixedly connected to the turntable housing 1. It can simultaneously bear the axial load, radial load, and overturning moment of the rotating part 3, improving the rotational accuracy and rigidity of the rotating part 3. An angle encoder is also provided at the end of the rotating shaft 31. The angle encoder is electrically connected to the control system of the CNC turntable and is used to detect the rotation angle of the rotating part 3 in real time and perform closed-loop position feedback control to improve the indexing and positioning accuracy. The brake piston 44 and brake spring 48 are multiple and evenly distributed along the circumference of the electromagnetic base 41, so that the braking surface of the brake pad 45 is subjected to uniform circumferential force. The electromagnetic base 41 is provided with a guide structure that guides the brake piston 44 axially and restricts its circumferential rotation, so that the brake piston 44 can only slide back and forth axially and cannot rotate with the brake pad 45. The brake spring 48 is a compression spring, and a friction lining is provided on the braking surface of the brake pad 45 to provide stable and reliable braking force in a compact structure.

[0028] The working principle of the electromagnetic de-energizing brake unit 4 is as follows: When the coil 43 is energized, it generates a magnetic attraction force, which overcomes the elastic force of the brake spring 48, causing the brake piston 44 to move away from the brake pad 45. At this time, the brake pad 45 and the rotating part 3 can rotate freely. When the coil 43 is de-energized, the magnetic attraction force disappears, and the brake spring 48 presses the brake piston 44 tightly onto the brake pad 45. Since the brake piston 44 cannot rotate with the brake pad 45, the friction between the brake piston 44 and the brake pad 45 brakes the brake pad 45 and the rotating part 3. Thus, the electromagnetic de-energizing brake unit 4 restricts the rotation of the rotating part 3 in the de-energized state, preventing the equipment from moving automatically due to gravity when the power is off, reducing safety hazards; in the energized state, it allows the rotating part 3 to rotate freely, cooperating with the motor power unit 2 to achieve normal indexing operation.

[0029] like Figure 6 As shown, to prevent the lubricating oil inside the turntable housing 1 from affecting the braking effect, an oil seal 47 is provided inside the electromagnetic base 41. The oil seal 47 is used to limit the contact between the lubricating oil and the brake piston 44 and brake pads 45. Simultaneously, a sealing ring 46 is provided between the electromagnetic base 41 and the turntable housing 1, and an inner oil seal 42 is provided between the turntable housing 1 and the rotating part 3. The sealing ring 46 and the inner oil seal 42 prevent lubricating oil from flowing out between the electromagnetic base 41 and the turntable housing 1, and between the turntable housing 1 and the rotating part 3, and also prevent external liquids, chips, and other impurities from entering the brake system. Figure 1 and Figure 2 As shown, the turntable housing 1 has a lubricating oil inlet and outlet on its side, with sealing bolts threaded onto the inlet and outlet. The threaded connection between the sealing bolts and the lubricating oil inlet and outlet can block them. To prevent oil leakage, a sealing ring can be installed between the inlet / outlet and the sealing bolts. To add or replace lubricating oil inside the housing, simply unscrew the sealing bolts.

[0030] Furthermore, the brake piston 44 and brake pad 45 are located in a dry braking chamber formed by the oil seal 47, which is isolated from the lubricating oil in the turntable housing 1, thus preventing the lubricating oil from entering the braking chamber and reducing the friction braking effect.

[0031] See Figures 7 to 10As shown, this embodiment also includes a safety anti-jamming lock 5, which works in conjunction with the electromagnetic power-off brake 4. The safety anti-jamming lock 5 includes a limit cutter disc 51, a limit disc 52, a safety pin 53, a fixed magnet 54, a telescopic hole 55, and a movable magnet 56. The limiting cutter disc 51 is fixed to the end of the rotating part 3 and rotates together with the rotating part 3; the limiting disc 52 is fixed on the turntable housing 1, the limiting disc 52 is provided with a telescopic hole 55, the bottom of the telescopic hole 55 is fixed with a fixed magnet 54, a safety pin 53 is movably arranged in the telescopic hole 55, and a movable magnet 56 is fixed at the end of the safety pin 53 facing the fixed magnet 54. The movable magnet 56 and the fixed magnet 54 attract each other and repel each other with the coil 43 of the electromagnetic de-energizing brake part 4; the limiting cutter disc 51 is provided with a cutting groove 511 that cooperates with the telescopic hole 55 on the side facing the turntable housing 1. The safety pin 53 is made of aluminum. Because the hardness of aluminum is lower than that of the iron material used in the equipment body, the equipment parts will not be damaged when the aluminum safety pin 53 is cut.

[0032] The technical problems addressed by the safety anti-jamming lock 5, as well as its working principle and technical effects, are as follows: The electromagnetic power-off brake unit 4 relies on the frictional force generated by the brake spring 48 pushing the brake piston 44 and the brake pad 45 to position and brake the equipment. When there is no load or the load is small, the electromagnetic power-off brake unit 4 can meet the braking requirements; however, under a large heavy load, or when the lubricating oil in the turntable housing 1 enters the electromagnetic power-off brake unit 4, the frictional braking force provided by the electromagnetic power-off brake unit 4 may not be sufficient to withstand the load, and the equipment may move automatically under the action of the load gravity, which poses a significant safety hazard. Therefore, this embodiment is equipped with a safety anti-jamming lock 5: When the equipment is powered off, the coil 43 loses its magnetism, the moving magnet 56 is no longer attracted by the coil 43, and the moving magnet 56 and the fixed magnet 54 generate a repulsive force, which pushes the safety pin 53 out of the telescopic hole 55 and inserts it into the cutting groove 511 of the limiting cutter disc 51. Thus, the mechanical limiting resistance provided by the safety pin 53 and the braking resistance of the electromagnetic power-off brake part 4 work together to reliably withstand a large load and prevent the equipment from moving passively under the load gravity when the equipment is stopped. When the equipment is powered on, the coil 43 generates a magnetic force to pull the moving magnet 56 and the safety pin 53 back into the telescopic hole 55, the safety pin 53 disengages from the cutting groove 511, and the rotating part 3 is released from the limit and works normally. Furthermore, the safety anti-jamming lock 5 has a self-protection function: if the safety anti-jamming lock 5 malfunctions and the moving magnet 56 and safety pin 53 are not pulled back into the telescopic hole 55 when the equipment is powered on, the motor power unit 2 will drive the limit cutter disc 51 to rotate forcibly. The cutting groove 511 on the limit cutter disc 51 will cooperate with the telescopic hole 55 to cut off the safety pin 53, allowing the equipment to continue operating normally without damaging its core components. Only the safety pin 53 needs to be replaced. Thus, the safety anti-jamming lock 5 improves equipment safety while minimizing the damage caused by its own malfunction, maximizing the safety and reliability of the equipment.

[0033] The overall working process of this invention is as follows: When the turntable needs to rotate, the coil 43 is energized, and the brake piston 44 moves away from the brake pad 45 under the action of electromagnetic attraction, thus releasing the brake on the rotating part 3. After the servo motor 21 starts, it drives the rotating part 3 to rotate in increments through the meshing of the cam and the roller 32; when the rotating part 3 needs to stop after rotating to the position, the coil 43 is de-energized, and the brake spring 48 pushes the brake piston 44 to press the brake pad 45, quickly braking the rotating part 3 and maintaining its stopped position; when it needs to rotate again, the coil 43 is energized, and the brake piston 44 moves away from the brake pad 45 under the action of magnetic attraction, releasing the brake on the rotating part 3 and continuing to rotate under the drive of the servo motor 21, thus repeating the cycle.

[0034] This invention discloses a CNC rotary table with a braking device. The invention employs an electromagnetic power-off braking unit to brake the rotating part. Compared to traditional pneumatic or hydraulic braking, it eliminates the need for air, oil, and hydraulic power stations; braking force is generated solely through the switching of the circuit. The structure is simpler and more compact, eliminating the risk of air or oil leaks and requiring no replenishment of air or hydraulic oil, thus simplifying maintenance. By installing the electromagnetic power-off braking unit between the rotating part and the rotary table housing, the rotating part can be braked quickly, improving the accuracy of the equipment's stopping position. In the power-off state, the electromagnetic power-off braking unit restricts the rotation of the rotating part, preventing the equipment from moving automatically due to gravity or inertia during power outages, reducing safety hazards. The electromagnetic power-off braking unit uses a coil, brake piston, brake pads, and brake spring in a coordinated structure. When energized, the coil generates magnetic attraction, causing the brake piston to move away from the brake pads, allowing the rotating part to rotate freely. When de-energized, the brake spring presses the brake piston against the brake pads, relying on friction to brake the rotating part. The structure is simple, reliable, and provides a fast braking response. The oil seals inside the electromagnetic base, the sealing ring between the electromagnetic base and the turntable housing, and the internal oil seal between the turntable housing and the rotating part prevent lubricating oil from contacting the brake components or leaking from the connections. They also prevent external liquids, chips, and other impurities from entering the brake system, ensuring braking performance and equipment cleanliness. Lubricating oil inlets and outlets are located on the side of the turntable housing and sealed with sealing bolts, facilitating lubrication and maintenance of the internal transmission components.

[0035] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A CNC rotary table with a braking device, characterized in that: include The turntable housing and the motor power unit are provided, with the motor power unit fixedly mounted on one side of the turntable housing. A rotating part is provided on the turntable housing, and the rotating part is connected to the motor power unit for transmission. An electromagnetic power-off brake unit is provided between the rotating part and the turntable housing, which controls the rotation state of the rotating part by switching on and off the power. A CNC rotary table with a braking device according to claim 1, characterized in that: a lubricating oil inlet and outlet are provided on the side of the rotary table housing, and a sealing bolt is threadedly connected to the lubricating oil inlet and outlet.

2. A CNC rotary table with a braking device according to claim 1, characterized in that: The electromagnetic power-off brake is configured to restrict the rotation of the rotating part when the power is off, and allow the rotating part to rotate freely when the power is on.

3. A CNC rotary table with a braking device according to claim 1, characterized in that: The motor power unit includes a servo motor, which is fixed to the turntable housing by bolts. The servo motor is connected to the rotating part for transmission. The output end of the servo motor is provided with a cam, and the servo motor is connected to the rotating part for transmission through the cam.

4. A CNC rotary table with a braking device according to claim 4, characterized in that: The cam is an arc-shaped cam, which is used to mesh with the rotating part to drive the rotating part to perform indexing rotation; the motor power unit also includes a motor protective cover covering the servo motor.

5. A CNC rotary table with a braking device according to claim 4, characterized in that: The rotating part includes a rotating shaft, rollers, and bearings. Rollers are arranged around the rotating shaft and mesh with a cam. A bearing is arranged between the rotating shaft and the turntable housing.

6. A CNC rotary table with a braking device according to claim 1, characterized in that: The electromagnetic power-off braking unit includes an electromagnetic base, a coil, a brake piston, a brake pad, and a brake spring. The electromagnetic base is fixed to the turntable housing, and the brake pad is fixed to the rotating part. The electromagnetic base is provided with a brake piston that controls the rotation state of the brake pad by reciprocating between the electromagnetic base and the brake pad. A brake spring is provided between the brake piston and the electromagnetic base to push the brake piston toward the brake pad to stop the brake pad. The electromagnetic base is provided with a coil that overcomes the elastic force of the brake spring by electromagnetic attraction to move the brake piston away from the brake pad.

7. A CNC rotary table with a braking device according to claim 7, characterized in that: The electromagnetic base is equipped with an oil seal to restrict the contact between lubricating oil and the brake piston and brake pads. The brake piston and brake pads are located in a dry braking chamber formed by the oil seal. There are multiple brake pistons and brake springs, which are evenly distributed along the circumference of the electromagnetic base. A sealing ring is provided between the electromagnetic base and the turntable housing, and an inner oil seal is provided between the turntable housing and the rotating part. The electromagnetic base is equipped with a guide structure that axially guides the brake piston and restricts its circumferential rotation, so that the brake piston can only slide back and forth axially and cannot rotate with the brake pads. The brake spring is a compression spring, and a friction lining is provided on the braking surface where the brake pads contact the brake piston.

8. A CNC rotary table with a braking device according to claim 6, characterized in that: The bearing is a crossed roller bearing, with its inner ring fixedly connected to the shaft and its outer ring fixedly connected to the turntable housing. It is used to simultaneously bear the axial load, radial load, and overturning moment of the rotating part. An angle encoder is provided at the end of the shaft, and the angle encoder is electrically connected to the control system of the CNC turntable for closed-loop position feedback control of the indexing rotation of the rotating part.

9. A CNC rotary table with a braking device according to claim 7, characterized in that: It also includes a safety anti-jamming lock that works in conjunction with the electromagnetic power-off brake to prevent the equipment from moving passively under heavy loads. The safety anti-jamming lock includes a limiting cutter disc, a limiting disc, a safety pin, a fixed magnet, a telescopic hole, and a moving magnet. The limiting cutter disc is fixed to the end of the rotating part. The turntable housing is provided with a telescopic hole. A fixed magnet is fixed to the bottom of the telescopic hole. A safety pin is movably installed in the telescopic hole. A moving magnet that attracts the fixed magnet and repels the coil is fixed to the end of the safety pin opposite to the fixed magnet. The side of the limiting cutter disc facing the turntable housing is provided with a cutting groove that cooperates with the telescopic hole to prevent equipment damage and form cutting limit resistance.

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