Automatic adjustment device for rotating balance of turntable

Abstract

The present invention provides a turntable rotary balance automatic adjustment device, including dynamic balance automatic measurement software and an adjustment device, the dynamic balance automatic measurement software is electrically connected to the adjustment device, the dynamic balance of the turntable rotation is measured by the dynamic balance automatic measurement software, the specific position of the unbalance amount is found, and then the adjustment device is controlled to adjust, the adjustment device is located inside the workbench, the adjustment device includes an adjustment component, a transmission component, a power component and an adjustment control component, the adjustment is controlled by the adjustment control component, and the power component provides power to adjust the position of the adjustment component through the transmission component to meet the dynamic balance. The adjustment action of the present invention is automatically completed by a servo motor, the adjustment action is fast and accurate, and the auxiliary processing time can be greatly saved. The processing efficiency of the workpiece is improved under the premise of meeting the dynamic balance requirements, and the problems such as the loss of turntable accuracy and the reduction of the life of components such as internal bearings caused by poor dynamic balance can be further avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of five-axis machining centers, and in particular relates to an automatic adjustment device for the rotational balance of a turntable. Background Art

[0002] The five-axis machining center is a key processing equipment urgently needed for the processing of precision and complex parts in the aerospace, aviation, energy, mold and other industries. The five-axis machining center turntable is the core functional component of the vertical five-axis machining center. Its function and precision directly affect the quality of machine tool products. In the traditional five-axis C-axis turntable form, when the speed of the worktable is high, the workpiece with poor dynamic balance will mainly cause the following hazards during processing. First, it will generate large noise under high-speed rotation. Second, due to the existence of unbalanced amount, a large centrifugal force will be generated during high-speed rotation, which can easily cause uneven force on the turntable positioning bearing and locally receive large radial force. Long-term processing will cause damage to important components such as bearings used for C-axis turntable load and positioning. Summary of the invention

[0003] The technical problem solved by the present invention is to provide an automatic adjustment device for the rotational balance of the C-axis of a five-axis machining center, which solves the two main problems that cause the imbalance when the C-axis turntable of the five-axis rotates. One is the uneven mass distribution caused by the irregular shape of the workpiece itself; the other is that the original balance state is changed after milling. In this way, the problems of loss of turntable accuracy and reduced life of components such as internal bearings caused by the poor dynamic balance of the rotating part of the turntable of the five-axis machining center are solved.

[0004] The technical solution adopted by the present invention is: an automatic adjustment device for the rotational balance of a turntable, including automatic dynamic balance measurement software and an adjustment device. The automatic dynamic balance measurement software is electrically connected to the adjustment device. The dynamic balance of the turntable rotation is measured by the automatic dynamic balance measurement software, the specific position of the imbalance is found, and then the adjustment device is controlled to make adjustments. The adjustment device is located inside the workbench. The adjustment device includes an adjustment component, a transmission component, a power component and an adjustment control component. The adjustment is controlled by the adjustment control component. The power component provides power to adjust the position of the adjustment component through the transmission component to meet the dynamic balance.

[0005] Preferably, the length direction of the adjustment component is arranged along the radius direction of the workbench plane, and the adjustment component includes a screw support and a balance adjustment slider. The screw support is a rectangular cavity, and a screw is installed in the screw support. The screw body is processed with external threads, and the two ends of the screw are axially positioned by bearings. One end of the screw is connected to the transmission component, and the screw is threadedly connected to the balance adjustment slider. The balance adjustment slider is a rectangular structure with a threaded hole running through the inside, which cooperates with the screw to realize the linear movement of the balance adjustment slider on the screw. A cover plate is connected to the upper end of the screw support cavity so that the top surface of the workbench is a plane. The adjustment component can find the specific position of the imbalance according to the dynamic balancing automatic measurement software and perform dynamic balancing adjustment by adjusting the relative position of the balance adjustment slider on the screw.

[0006] Preferably, the number of the adjustment components is 6 to 8 sets, which are evenly distributed at equal angles along the plane of the workbench. One or several sets of adjustment components can be selected for adjustment according to the specific unbalanced position, and adjustments can be made accurately and quickly to improve precision and efficiency.

[0007] Preferably, the stroke range of the balance adjustment slider is 0.4R-0.75R, R is the radius of the workbench plane, and the balance adjustment slider stroke covers most of the area where the workbench plane is placed, meeting the dynamic balance adjustment requirements of the workpiece.

[0008] Preferably, the transmission assembly is a bevel gear and a bevel gear shaft and a first gear installed at the end of the lead screw, the bevel gear is meshed with the bevel gear shaft, and the first gear is installed on the bevel gear shaft. The axes of the bevel gear and the bevel gear shaft are perpendicular to each other, and the power provided by the power assembly is transmitted to the adjustment assembly through the meshing of the bevel gear and the bevel gear shaft. The number of transmission assemblies is the same as the number of adjustment assemblies and the positions correspond.

[0009] Preferably, the adjustment control assembly includes a gear spline shaft and a piston, the lower end of the gear spline shaft is a gear end, the shaft is a variable diameter shaft, the lower diameter is larger than the upper diameter to form a stepped platform, a third gear is installed on the lower shaft of the gear spline shaft, the third gear is meshed with the first gear, a spring is mounted on the upper shaft of the gear spline shaft, the upper end of the gear spline shaft is fixedly connected to the piston, the piston is located in the oil chamber of the workbench, the upper end of the cavity is sealed by a flange, so that the top surface of the workbench is a plane. The number of adjustment control assemblies is the same as the number of adjustment assemblies and the positions correspond. The function of the adjustment control assembly is to control whether to adjust the position of the corresponding adjustment assembly. When the position of one or more adjustment assemblies needs to be adjusted, the gear spline shaft of the corresponding adjustment control assembly is pressed downward to make the gear end at the lower end mesh with the transmission gear and the third gear meshes with the first gear, so that the power provided by the power assembly can be transmitted to the adjustment assembly. When the adjustment is completed, the gear spline shaft is reset without affecting the normal operation of the workbench.

[0010] Preferably, the power assembly includes a servo motor and a second gear mounted on the servo motor, the second gear meshes with the transmission gear, the height of the second gear is smaller than the transmission gear, and the second gear meshes with the transmission gear at the lower part of the outer periphery of the transmission gear, and the transmission gear is supported by a cross roller bearing fixed on a bearing flange, and the bearing flange is fixedly connected to the C-axis turntable body. The C-axis turntable body is equivalent to the lower end fixed bracket structure of the entire workbench, and the meshing of the second gear and the transmission gear does not interfere with the meshing of the gear end at the lower end of the gear spline shaft and the transmission gear, thereby achieving the function of transmitting power.

[0011] Preferably, the regulating control component supplies oil to the oil inlet on the hydraulic distributor corresponding to the regulating control component through the hydraulic control valve. The hydraulic oil enters the oil chamber through the core shaft, the positioning flange and the oil circuit inside the workbench, compresses the spring, and causes the piston and the gear spline shaft to move downward and engage with the upper part of the outer periphery of the transmission gear.

[0012] Preferably, the hydraulic distributor is fixed on a C-axis turntable body, and the C-axis turntable body is located at the lower part of the workbench. The C-axis turntable body and the workbench are connected via a turntable bearing. The outer ring of the turntable bearing is connected to the workbench and rotates synchronously. The inner ring of the turntable bearing is fixedly connected to the C-axis turntable body. The outer ring of the turntable bearing is connected to a connecting flange via screws. The connecting flange is connected to a torque motor rotor to transmit rotational force. The torque motor is used to provide rotational force when the turntable is working. When the turntable is working, the workbench rotates, and the C-axis turntable body is fixed.

[0013] Preferably, the mandrel is located at the axis of the workbench and passes through it from top to bottom. The upper end of the mandrel is connected to a positioning flange. An angle encoder is mounted on the mandrel. The angle encoder is used to control the rotation angle, speed and stop position of the workbench. A rotary seal is installed between the mandrel and the hydraulic distributor. The angle encoder is equivalent to a sensor, which performs speed and position closed loops, detects the speed and position of the workbench, and feeds back signals to the servo motor, and makes corresponding adjustments according to the measurement results of the dynamic balancing automatic measurement software.

[0014] The beneficial effects of the present invention are as follows: the automatic adjustment device of the present invention is installed inside the turntable, so it has no effect on the clamping and adjustment of the workpiece, and its adjustment actions are all automatically completed by the servo motor, the adjustment actions are fast and accurate, and can greatly save auxiliary processing time, improve the processing efficiency of the workpiece under the premise of meeting the dynamic balance requirements, and further avoid the problems of loss of turntable accuracy and reduced life of components such as internal bearings caused by poor dynamic balance. Under the condition of high-speed rotation of the turntable, the dynamic balance of the turntable rotation is measured using the dynamic balance automatic measurement software, and the position of the corresponding balance adjustment slider on the lead screw is adjusted by the hydraulic control valve to balance the centrifugal force and improve the processing accuracy and processing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the cross-sectional structure of the automatic adjustment device for the rotation balance of the turntable;

[0016] Figure 2 It is a schematic diagram of the structure of the automatic adjustment device for the rotation balance of the turntable when viewed from above;

[0017] Figure 3 It is a structural schematic diagram of the spring in a compressed state after oil is introduced;

[0018] Figure 4 It is a structural schematic diagram of the spring recovery state after oil return;

[0019] Figure 5 Schematic diagram of the balance adjustment slider stroke.

[0020] Reference numerals: 1-balance adjustment slider, 2-screw support, 3-first gear, 4-bevel gear, 5-flange, 6-positioning flange

[0021] 7- spindle, 8- angle encoder, 9- piston, 10- gear spline shaft, 11- spring, 12- bevel gear shaft, 13- lead screw, 14- turntable bearing, 15- connecting flange, 16- torque motor rotor, 17- second gear, 18- servo motor, 19- hydraulic distributor, 20- rotary seal ring, 21- bearing flange, 22- cross roller bearing, 23- transmission gear, 24- C-axis turntable body, 25- third gear, 26- workbench, 27- cover plate. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0023] The principle of the present invention is: when the workbench is rotating at a high speed, the dynamic balance of the workbench rotation is measured using dynamic balance automatic measurement software, and the hydraulic control valve controls the oil circuit so that the hydraulic oil enters the corresponding oil chamber to control the downward movement of the adjustment control component, so that the connection between the power component and the adjustment component is established, and then the position of the balance adjustment slider on the screw is adjusted to balance the centrifugal force.

[0024] like Figure 1As shown, an automatic adjustment device for the rotational balance of a turntable includes automatic dynamic balance measurement software and an adjustment device. The automatic dynamic balance measurement software is electrically connected to the adjustment device. The dynamic balance of the turntable rotation is measured by the automatic dynamic balance measurement software, the specific position of the unbalanced amount is found, and then the adjustment device is controlled to make adjustments. The adjustment device is located inside the workbench 26. The adjustment device includes an adjustment component, a transmission component, a power component and an adjustment control component. The adjustment is controlled by the adjustment control component. The power component provides power to adjust the position of the adjustment component through the transmission component to meet the dynamic balance.

[0025] like Figure 1 and Figure 2 As shown, the number of adjustment components is 6 to 8 sets, which are evenly distributed along the plane of the workbench 26 at equal angles. The length direction of each set of adjustment components is arranged along the radius direction of the plane of the workbench 26. The adjustment component includes a screw support 2, which is located in a rectangular cavity at the lower part of the workbench plane. The screw support 2 includes a bottom surface and stepped groove holes at both ends for fixing bearings. The screw support 2 is hollow to form a rectangular cavity. A screw 13 is installed in the cavity of the screw support 2. The main body of the screw 13 is processed with external threads. The screw 1 The two ends of the screw 13 are axially positioned by bearings, one end of the screw 13 (the end close to the center of the workbench 26) is connected to the transmission assembly, and the screw 13 body is threadedly connected to the balance adjustment slider 1. The balance adjustment slider 1 is a rectangular structure with a threaded hole running through the inside, and cooperates with the screw 13 to realize the linear motion of the balance adjustment slider 1 on the screw 13. The cover plate 27 is connected to the upper end of the cavity of the screw support 2 so that the top surface of the workbench 26 is a plane, and the top surface of the balance adjustment slider 1 is in contact with the bottom surface of the cover plate 27. Figure 5 As shown, the travel range of the balance adjustment slider 1 is 0.4R-0.75R, where R is the radius of the workbench plane.

[0026] like Figure 1 As shown, the transmission assembly includes a bevel gear 4 and a bevel gear shaft 12 and a first gear 3 installed at the end of the lead screw 13. The bevel gear 4 meshes with the bevel gear shaft 12. The bevel gear shaft 12 is a shaft with a bevel gear at the top. The bevel gear shaft 12 is mounted on a bearing, and the bearing is fixed in a workbench 26. The first gear 3 is installed on the lower shaft of the bevel gear shaft 12. The lower end locks the first gear 3 and the bevel gear shaft 12 through a locking member. The first gear 3 has a stepped platform, and a bearing is installed at the stepped platform. The outer ring of the bearing is equipped with a bearing seat, and the bearing seat is screwed to the workbench 26 to fix the axial positioning of the bevel gear shaft 12. The axis of the bevel gear 4 and the bevel gear shaft 12 are perpendicular to each other. The power provided by the power assembly is transmitted to the adjustment assembly through the meshing of the bevel gear 4 and the bevel gear shaft 12. The number of transmission assemblies is the same as the number of adjustment assemblies and the positions correspond.

[0027] like Figure 1As shown, the adjustment and control assembly includes a gear spline shaft 10 and a piston 9. The lower end of the gear spline shaft 10 is a gear end. The shaft rod is a variable diameter shaft rod. The lower diameter is larger than the upper diameter to form a stepped platform. A third gear 25 is installed on the lower shaft rod of the gear spline shaft 10. The third gear 25 is meshed with the first gear 3. The third gear 25 has stepped platforms on the upper and lower parts. A bearing is installed at the stepped platform. A bearing seat is installed on the outer ring of the lower end bearing. The bearing seat is screwed to the workbench 26. The gear end of the gear spline shaft 10 is located on the outside of the bearing seat. A spring 11 is mounted on the upper shaft of the gear spline shaft 10. The upper end of the gear spline shaft 10 is fixedly connected to a piston 9. The piston 9 is located in the oil chamber of the workbench 26. The upper end of the chamber is sealed by a flange 5, so that the top surface of the workbench 26 is a plane. The upper end of the spring 11 is pressed against the lower end surface of the piston 9, and the lower end of the spring 11 is pressed against the bottom end surface of the oil chamber. There is a space between the upper end of the piston 9 and the oil chamber for the hydraulic oil to enter the oil chamber and compress the piston 9. The side wall of the piston 9 is sealed with a sealing ring. The number of adjustment control components is the same as the number of transmission components and the positions correspond. The third gear 25 of each set of adjustment control components is meshed with the first gear 3 of its corresponding transmission component.

[0028] like Figure 1 As shown, the power assembly includes a servo motor 18 and a second gear 17 mounted on the servo motor. The second gear 17 meshes with a transmission gear 23. The height of the second gear 17 is smaller than that of the transmission gear 23. The second gear 17 meshes with the transmission gear 23 at the lower part of the outer periphery of the transmission gear 23. The transmission gear 23 is supported by a cross roller bearing 22 fixed on a bearing flange 21. The bearing flange 21 is fixedly connected to a C-axis turntable body 24. The C-axis turntable body 24 is equivalent to the lower end fixed bracket structure of the entire workbench 26. The number of transmission gears 23 is one, and the center of the circle of the transmission gear 23 coincides with the axis of the workbench 26. The meshing of the second gear 17 and the transmission gear 23 does not interfere with the meshing of the gear end at the lower end of the gear spline shaft 10 and the transmission gear 23, so as to achieve the function of transmitting power.

[0029] like Figure 3 As shown, the adjustment control component supplies oil to the oil inlet corresponding to the adjustment control component on the hydraulic distributor 19 through the hydraulic control valve. The hydraulic oil enters the upper end of the piston 9 in the oil chamber through the core shaft 7, the positioning flange 6 and the oil path inside the workbench 26, compressing the spring 11, so that the piston 9 and the gear spline shaft 10 move downward and mesh with the upper part of the outer periphery of the transmission gear 23. When the adjustment is completed or no adjustment is required, as shown in FIG. Figure 4 As shown, the hydraulic oil is depressurized, and the spring 11 is reset under the action of elastic force, thereby driving the piston 9 and the gear spline shaft 10 to move upward and disengage from the transmission gear 23.

[0030] like Figure 1As shown, the hydraulic distributor 19 is fixed on the C-axis turntable body 24, the C-axis turntable body 24 is located at the lower part of the worktable 26, the C-axis turntable body 24 and the worktable 26 are connected through a turntable bearing 14, the outer ring of the turntable bearing 14 is connected to the worktable 26 for synchronous rotation, the inner ring of the turntable bearing 14 is fixedly connected to the C-axis turntable body 24, the outer ring of the turntable bearing 14 is connected to the connecting flange 15 by screws, the connecting flange 15 is connected to the torque motor rotor 16 to transmit the rotational force, the torque motor is used to provide rotational force when the turntable is working, the worktable 26 rotates when the turntable is working, and the C-axis turntable body 24 is fixed.

[0031] like Figure 1 As shown, the core shaft 7 is located at the axis center of the workbench 26 and passes through it from top to bottom. The upper end of the core shaft 7 is connected to the positioning flange 6. An angle encoder 8 is mounted on the core shaft 7. The angle encoder 8 is used to control the rotation angle, speed and stop position of the workbench. A rotary sealing ring 20 is installed between the core shaft 7 and the hydraulic distributor 19.

[0032] When processing a workpiece, first fix the workpiece to be processed on the worktable plane, then rotate the worktable 26, and use the dynamic balancing automatic measurement software to measure and find the specific position of the imbalance; then stop the worktable 26, and adjust the dynamic balance according to the data provided by the dynamic balancing automatic measurement software; for example, 8 sets of adjustment devices are installed on the worktable plane of the worktable 26, and the 8 sets of adjustment devices correspond to 8 directions on the circumference (such as Figure 2 As shown), before dynamic balancing adjustment, all balance adjustment sliders 1 are at one end of the screw 13 close to the center of the turntable, and one or more corresponding adjustment devices are found according to the position of the unbalanced amount. Specifically, dynamic balancing adjustment is required in the direction of light mass.

[0033] Each set of adjusting devices is adjusted in the following way: the hydraulic control valve is used to supply oil to the oil inlet corresponding to the adjusting device on the hydraulic distributor 19, and the hydraulic oil enters the oil chamber through the core shaft 7, the positioning flange 6 and the oil path inside the workbench 26. The piston 9 compresses the spring 11, so that the piston 9 and the gear spline shaft 10 move downward and mesh with the transmission gear 23. The servo motor 18 drives the second gear 17 to rotate so that the transmission gear 23 meshing with it rotates, and then the gear spline shaft 10 rotates while the third gear 25 fixed thereon rotates, driving the first gear 3 meshing with the third gear 25 to rotate. The rotation of the first gear 3 also rotates the bevel gear shaft 12 to drive the bevel gear 4 meshing with it to rotate and drive the lead screw 13 to rotate, thereby adjusting the position of the balance adjustment slider 1 on the lead screw 13 to balance the centrifugal force generated by the unbalanced amount. If one set of adjusting devices cannot meet the requirements, the same operation is performed on each set of adjusting devices that need to be adjusted until the dynamic balance meets the requirements.

[0034] After the adjustment is completed, the hydraulic oil is depressurized, and the spring 11 is reset under the action of elastic force, thereby driving the piston 9 and the gear spline shaft 10 to move upward and disengage from the transmission gear 23. At this time, the workbench 26 can perform normal processing according to the predetermined processing procedure.

[0035] If the same workpieces are processed in batches, the placement position and angle of the first workpiece must be determined. After adjusting the dynamic balance, the same workpieces are placed at the same position and angle, and dynamic balancing can be performed once to achieve the purpose of continuous production.

[0036] If it is a milling process, dynamic balance adjustment is performed according to the above method before processing. After the processing is completed, if the workpiece is greatly deformed, the original balance state is changed. If the subsequent operation of the workpiece is still carried out on the workbench 26, dynamic balance adjustment can be re-performed according to the above method. There is no need to re-move and place the workpiece, which greatly simplifies the operation difficulty and improves work efficiency.

[0037] The above are specific embodiments of the present invention and the technical principles used. Any modifications and equivalent changes based on the technical solution of the present invention should be included in the protection scope of the present invention.

Claims

1. A turntable rotation balance automatic adjustment device, Features: It includes dynamic balancing automatic measurement software and an adjustment device. The dynamic balancing automatic measurement software is electrically connected to the adjustment device. The dynamic balance of the turntable rotation is measured by the dynamic balancing automatic measurement software to find out the specific position of the unbalanced amount and then control the adjustment device to make adjustments. The adjustment device is located inside the workbench. The adjustment device includes an adjustment component, a transmission component, a power component and an adjustment control component. The adjustment is controlled by the adjustment control component. The power component provides power to adjust the position of the adjustment component through the transmission component to meet the dynamic balance. The adjustment assembly includes a screw support and a balance adjustment slider. A screw is installed in the screw support. Both ends of the screw are axially positioned by bearings. One end of the screw is connected to the transmission assembly. The screw is threadedly connected to the balance adjustment slider. The balance adjustment slider is a rectangular structure with a threaded hole running through the inside. It cooperates with the screw to realize the linear motion of the balance adjustment slider on the screw. The transmission assembly is a bevel gear, a bevel gear shaft and a first gear installed at the end of the lead screw, the bevel gear is meshed with the bevel gear shaft, and the first gear is installed on the bevel gear shaft; The regulating control assembly includes a gear spline shaft and a piston. A third gear is installed on the lower shaft of the gear spline shaft. The third gear is meshed with the first gear. A spring is installed on the upper shaft of the gear spline shaft. The upper end of the gear spline shaft is fixedly connected to the piston. The piston is located in the oil cavity of the workbench, and the upper end of the cavity is sealed by a flange. The power assembly includes a servo motor and a second gear mounted on the servo motor, the second gear meshes with a transmission gear, and the transmission gear is supported by a cross roller bearing fixed on a bearing flange, and the bearing flange is fixedly connected to the C-axis turntable body; The regulating control component supplies oil to the oil inlet corresponding to the regulating control component on the hydraulic distributor through the hydraulic control valve. The hydraulic oil enters the oil chamber through the core shaft, the positioning flange and the oil path inside the workbench. The compression spring causes the piston and the gear spline shaft to move downward and mesh with the upper part of the outer periphery of the transmission gear.

2. The automatic adjustment device for rotating balance of a turntable according to claim 1, Features: The length direction of the adjustment component is arranged along the radius direction of the workbench plane, the screw support is a rectangular cavity, the screw body is processed with external threads, and a cover plate is connected to the upper end of the screw support cavity to make the top surface of the workbench a plane.

3. The automatic adjustment device for rotating balance of a turntable according to claim 1, Features: The number of the adjustment components is 6 to 8 sets, which are evenly distributed at equal angles along the plane of the workbench.

4. The automatic adjustment device for rotating balance of a turntable according to claim 1, Features: The travel range of the balance adjustment slider is 0.4R-0.75R, where R is the radius of the workbench plane.

5. The automatic adjustment device for rotating balance of a turntable according to claim 1, Features: The lower end of the gear spline shaft is a gear end, the shaft rod is a variable diameter shaft rod, and the lower diameter is larger than the upper diameter to form a stepped platform.

6. The automatic adjustment device for rotating balance of a turntable according to claim 1, Features: The second gear has a height smaller than the transmission gear and is meshed with the transmission gear at the lower portion of the outer periphery of the transmission gear.

7. The automatic adjustment device for rotating balance of a turntable according to claim 1, Features: The hydraulic distributor is fixed on the C-axis turntable body, the C-axis turntable body is located at the lower part of the workbench, the C-axis turntable body and the workbench are connected through a turntable bearing, the outer ring of the turntable bearing is connected to the workbench and rotates synchronously, the inner ring of the turntable bearing is fixedly connected to the C-axis turntable body, the outer ring of the turntable bearing is connected to the connecting flange through screws, the connecting flange is connected to the torque motor rotor to transmit rotational force, and the torque motor is used to provide rotational force when the turntable is working.

8. The automatic adjustment device for rotating balance of a turntable according to claim 1, Features: The core shaft is located at the axis center of the workbench and passes through it up and down. The upper end of the core shaft is connected to a positioning flange. An angle encoder is mounted on the core shaft. The angle encoder is used to control the rotation angle, speed and stop position of the workbench. A rotary sealing ring is installed between the core shaft and the hydraulic distributor.

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