High-precision ring workpiece numerical control turntable self-centering clamping device and clamping method thereof

Abstract

The application relates to the technical field of clamping devices, in particular to a high-precision self-centering clamping device for a circular ring workpiece numerical control rotary table and a clamping method thereof. The support disc is connected to the rotary table body, the rotary table body drives the support disc to rotate, and the rolling support mechanism provides support when the support disc rotates, so that the numerical control rotary table can stably clamp a large circular ring workpiece. The first guide rail, the first sliding seat and the clamping seat adjusting assembly are designed, before clamping the circular ring workpiece, the connecting position of the clamping seat body in the first sliding seat can be flexibly adjusted according to the size of the clamped circular ring workpiece, the clamping seat body and the first sliding seat are connected through the rack, and the first fastener is locked, which can position the clamping seat body and ensure the close connection between the clamping seat body and the first sliding seat, so that the slight displacement of the circular ring workpiece caused by vibration during the machining process of the numerical control machine tool is avoided, and the machining precision is affected.

Description

[0001] This case is a divisional application of the patent application with application number 202210281530.2, application date 2022-03-21, entitled "Self-centering clamping device and clamping method for CNC turntable of circular workpiece". Technical Field

[0002] This invention relates to the field of clamping device technology, and in particular to a high-precision CNC rotary table self-centering clamping device for circular workpieces and its clamping method. Background Technology

[0003] In the prior art, before large circular workpieces are precision machined by CNC machine tools, they need to be positioned and clamped on a fixture. Although there is a technology in the prior art to center and clamp circular workpieces using a three-jaw chuck, the existing three-jaw chuck is difficult to directly apply to the centering and clamping of large circular workpieces.

[0004] Currently, large circular workpieces are usually clamped and positioned manually using a chuck-type mechanism with multiple adjustments. After adjustment, the workpiece is fixed by an electromagnet. However, this structure has the problem of difficulty in centering the circular workpiece, often requiring multiple adjustments, which takes a long time. Furthermore, the preload of the clamping force is difficult to control, and the workpiece may loosen due to various forces during the machining process after clamping, posing a safety hazard.

[0005] Chinese patent application CN113528770A discloses a hydraulic clamping device for large ring-shaped parts. By rotating an adjustment handwheel, the supporting or clamping moving component is activated. Through the transition of a large bevel gear, other supporting and clamping moving components move together, thereby adjusting the radial position of the support and clamping seats along the rotary table until the support seat reaches the target position and the clamping seat is positioned near the side wall of the part to be clamped. This radial adjustment of the support and clamping seats along the rotary table meets the clamping requirements of different part diameters or outer diameters with inner holes. Then, a hydraulic cylinder transmits power to a power chuck, activating the chuck. The power chuck transmits power to m clamping seats via a pull rod. The m clamping seats move in the same direction and distance along their respective first guide rails to clamp the part while ensuring the part's center remains constant.

[0006] The hydraulic clamping device for large ring-shaped parts designed in the aforementioned patent is mainly used for supporting, positioning, and clamping parts on quenching machine tools. Since the machining of parts on quenching machine tools is not precision machining, the clamping accuracy requirements are relatively low. The clamping device does not need to be equipped with a grating ruler, and the workpiece is not subjected to various external forces during the quenching process, so it is not easy for it to loosen. However, CNC machine tools require the workpiece to be precision machined with extremely high precision, and the requirements for the accuracy and stability of the workpiece clamping are extremely high. Since CNC machine tools need to perform milling, drilling, and other operations on the workpiece, the workpiece will vibrate during the machining process. If the clamping stability is poor, the workpiece clamping will loosen. Therefore, the hydraulic clamping device used for quenching machine tools is difficult to directly apply to the field of CNC machine tools.

[0007] Therefore, how to improve the structure of the CNC machine tool clamping device for circular workpieces, so that it can improve the efficiency and accuracy of centering and clamping of circular workpieces, and ensure that the workpiece clamping maintains an appropriate preload force so that it will not loosen during milling, drilling and other processing, has become an urgent technical problem to be solved. Summary of the Invention

[0008] The technical problem to be solved by this invention is: how to improve the structure of the CNC machine tool clamping device for circular workpieces so that it can improve the efficiency and accuracy of centering and clamping of circular workpieces, and ensure that the workpiece clamping maintains an appropriate preload so that it will not loosen during milling, drilling and other processing.

[0009] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0010] This invention relates to a self-centering clamping device for a CNC rotary table of a circular workpiece, comprising:

[0011] Base;

[0012] A turntable body, which is connected to the upper part of the base;

[0013] A hydraulic chuck mechanism is connected to the upper part of the turntable body. The hydraulic chuck mechanism includes a chuck body and multiple sliders. The multiple sliders are arranged in a circumferential array and slidably connected to the chuck body. The multiple sliders are equidistant from the central axis of the chuck body.

[0014] A support disk is connected to the turntable body;

[0015] A rolling support mechanism, wherein multiple rolling support mechanisms are arranged in a circumferential array on the base, and the lower part of the support disk is tactilely connected to the rolling support mechanism;

[0016] The first guide rail, and a plurality of the first guide rails are connected to the upper part of the support disk in a circular array. The number of the first guide rails is the same as the number of sliders. The first guide rails are parallel to the sliding direction of one of the sliders.

[0017] The first sliding seat is slidably connected to the first guide rail and is connected to one of the sliders. The upper surface of the first sliding seat is provided with a first toothed rack.

[0018] A retainer adjustment assembly includes a retainer body and a first fastener. The lower part of the retainer body is provided with a second rack that cooperates with a first rack. The retainer body is connected to the upper part of a first sliding seat. The retainer body includes a support part for supporting a circular workpiece and a snap-fit ​​part for snapping the outer or inner circumferential surface of the circular workpiece. The first fastener is used for fastening the retainer body and the first sliding seat.

[0019] Furthermore, the aforementioned self-centering clamping device structure for the CNC rotary table of the circular workpiece also includes an oil supply assembly, which comprises:

[0020] First oil supply support, the first oil supply support is connected to the base;

[0021] A hydraulic cylinder, wherein the cylinder body is connected to a first oil supply support, and the moving direction of the hydraulic cylinder is radial to the turntable body;

[0022] A first integrated block is connected to the piston rod of the hydraulic cylinder;

[0023] The first oil inlet connecting pipe, the oil outlet end of the first oil inlet connecting pipe is connected to the first integrated block;

[0024] The first oil outlet connecting pipe has its oil inlet end connected to the first integrated block;

[0025] The hydraulic station has an oil inlet end connected to the hydraulic station and an oil outlet end connected to the hydraulic station.

[0026] The second integrated block is connected to the outer circumference of the support disk;

[0027] The second oil inlet connecting pipe has its oil inlet end connected to the second integrated block, and the oil inlet end of the second oil inlet connecting pipe is at the same height as the oil outlet end of the first oil inlet connecting pipe.

[0028] The second oil outlet connection pipe has its oil outlet end at the same height as the oil inlet end of the first oil outlet connection pipe.

[0029] A hydraulic lock, wherein the oil outlet end of the second oil inlet connecting pipe is connected to the hydraulic lock, and the oil inlet end of the second oil outlet connecting pipe is connected to the hydraulic lock;

[0030] The third oil inlet connection pipe has its inlet end connected to the hydraulic lock and its outlet end connected to the turntable body.

[0031] The third oil outlet connection pipe has its oil outlet end connected to the hydraulic lock and its oil inlet end connected to the turntable body.

[0032] Furthermore, in the above-mentioned self-centering clamping device structure for the CNC turntable of the circular workpiece, the upper surface of the slider is provided with a third toothed rack;

[0033] It also includes an L-shaped connector; one end of the L-shaped connector is provided with a fourth rack that cooperates with the third rack, and the other end of the L-shaped connector is connected to the first sliding seat;

[0034] It also includes a second fastener for securing the L-shaped connector to the slider.

[0035] Furthermore, in the aforementioned self-centering clamping device structure for the CNC turntable of the circular workpiece, the clamping part of the clamping body is provided with two clamping strips arranged in the vertical direction.

[0036] Furthermore, in the above-mentioned self-centering clamping device structure for the CNC turntable of the circular workpiece, the surface of the clamping strip is arc-shaped.

[0037] Furthermore, in the above-mentioned self-centering clamping device structure for the CNC turntable of the circular workpiece, a second guide rail is provided at the upper center of the first sliding seat, and the clamping body is slidably connected to the second guide rail.

[0038] Furthermore, in the above-mentioned self-centering clamping device structure for the CNC turntable of the circular workpiece, each of the first sliding seats is connected to two clamping adjustment components on its upper part, and the clamping parts of the two clamping adjustment components face opposite directions.

[0039] Furthermore, the above-mentioned self-centering clamping device structure for the CNC rotary table of the circular workpiece also includes an auxiliary support mechanism, which includes:

[0040] The third guide rail, a plurality of the third guide rails are connected to the upper part of the support disk in a circumferential array, and the direction of the third guide rail is the radial direction of the turntable body; each of the third guide rails is located between two adjacent first guide rails;

[0041] A sliding support base is slidably connected to the third guide rail, and the sliding support base is used to assist in supporting the annular workpiece;

[0042] The third fastener is used for the fastening connection between the sliding support and the third guide rail.

[0043] Furthermore, in the above-mentioned self-centering clamping device structure for the CNC turntable of the circular workpiece, the number of sliders is 3, the number of first guide rails is 3, the number of first sliding seats is 3, and the number of third guide rails is 3.

[0044] The present invention also relates to a method for clamping a circular workpiece using the above-mentioned self-centering clamping device for a CNC rotary table, comprising the following steps:

[0045] Step 1: Adjust the connection position of the first sliding seat on the first guide rail so that the vertical distance between each first sliding seat and the axis of the turntable body is the same. Adjust the connection position of the card holder body on the first sliding seat so that the vertical distance between each card holder body and the axis of the turntable body is the same. The first fastener securely connects the card holder body to the first sliding seat.

[0046] Step 2: Control the movement of the hydraulic cylinder so that the oil outlet end of the first oil inlet connection pipe is connected to the oil inlet end of the second oil inlet connection pipe, and the oil outlet end of the first oil outlet connection pipe is connected to the oil outlet end of the second oil outlet connection pipe.

[0047] Step 3: Place the circular workpiece on the support part of each chuck body, control the hydraulic station to supply oil to the chuck body or the hydraulic chuck to supply oil to the hydraulic station, and control the oil inlet or oil outlet of the hydraulic lock to lock, so that each slider of the chuck body moves synchronously, and the clamping part of the chuck body clamps the inner or outer circumference of the circular workpiece.

[0048] Step 4: Control the oil inlet and outlet directions of the hydraulic lock to lock, and control the movement of the hydraulic cylinder to disengage the oil outlet end of the first oil inlet connecting pipe from the oil inlet end of the second oil inlet connecting pipe, and disengage the oil inlet end of the first oil outlet connecting pipe from the oil outlet end of the second oil outlet connecting pipe.

[0049] Step 5: Control the rotation of the turntable body and use a CNC machine tool to process the circular workpiece;

[0050] Step 6: After the CNC machine tool finishes machining, control the rotary table body to rotate to the position where the first integrated block and the second integrated block are opposite each other, and then stop rotating;

[0051] Step 7: Control the movement of the hydraulic cylinder so that the oil outlet end of the first oil inlet connection pipe is connected to the oil inlet end of the second oil inlet connection pipe, and the oil outlet end of the first oil outlet connection pipe is connected to the oil outlet end of the second oil outlet connection pipe.

[0052] Step 8: Control the oil inlet or outlet direction of the hydraulic lock to open, so that each slider of the chuck body moves synchronously, so that the locking part of the chuck body loosens its clamping on the inner or outer circumference of the ring workpiece, and remove the ring workpiece.

[0053] The beneficial effects of this invention are as follows: In the self-centering clamping device structure of the CNC rotary table for circular workpieces involved in this invention, by setting a support disc connected to the rotary table body, the rotary table body drives the support disc to rotate, and the rolling support mechanism provides support for the rotation of the support disc, enabling the CNC rotary table to stably clamp large circular workpieces. Since the existing hydraulic chucks are too small to clamp large circular workpieces, this invention designs a first guide rail, a first sliding seat, and a chuck adjustment assembly. Before clamping the circular workpiece, the connection position of the chuck body on the first sliding seat can be flexibly adjusted according to the size of the circular workpiece to be clamped. The chuck body and the first sliding seat are connected by a rack and pinion mechanism and locked by a first fastener. This facilitates the positioning of the chuck body and ensures a tight fit between the chuck body and the first sliding seat, preventing the circular workpiece from slightly shifting due to vibration during the CNC machine tool processing, which would affect the processing accuracy. The above structure can improve the efficiency and accuracy of centering and clamping of circular workpieces, and ensure that the workpiece is clamped with appropriate preload so that it will not loosen during milling, drilling and other machining processes.

[0054] Furthermore, the self-centering clamping device of this invention is used in CNC machine tool processing, which requires extremely high rotational and clamping accuracy of the rotary table body. Therefore, a linear scale is installed inside the rotary table body. In the prior art, the oil supply line of the chuck body is directly connected to the hydraulic chuck. This method requires the use of a rotary joint to ensure stable oil supply when the chuck body rotates with the rotary table body. However, to improve clamping accuracy, the sealing performance of the rotary joint is extremely important, but the seals are prone to aging after long-term use. Since the above oil supply components are located inside the clamping device, the difficulty of inspection and replacement of seals is extremely high. If an auxiliary support rolling support mechanism is used, the difficulty of inspection and replacement of seals will be further increased. Therefore, this invention... The invention relates to a structure for a clamping device that improves the structure and connection of the oil supply assembly. The first oil supply support and the hydraulic station are positioned on the outer side of the supporting disc. Only when the turntable body stops rotating, the movement of the hydraulic cylinder engages the first and second integrated blocks, thereby connecting the hydraulic station and the chuck body. A hydraulic lock connected at a specific position enables the connection and locking of the oil supply pipeline, achieving the clamping or loosening of the annular workpiece. When the turntable body rotates, the first and second integrated blocks separate, meaning there is no need for connection between the hydraulic station and the chuck body. Therefore, a rotary joint structure is not required inside the chuck body, ensuring a more durable seal and reducing the difficulty of maintaining the oil supply assembly. Attached Figure Description

[0055] Figure 1 This is a schematic diagram of the structure of a self-centering clamping device for a circular workpiece on a CNC rotary table according to a specific embodiment of the present invention, showing the clamping state of a circular workpiece.

[0056] Figure 2 This is a partial top view of a self-centering clamping device for a CNC rotary table of a circular workpiece according to a specific embodiment of the present invention.

[0057] Figure 3 This is a schematic diagram of the oil supply component structure of a self-centering clamping device for a CNC rotary table of a circular workpiece according to a specific embodiment of the present invention.

[0058] Figure 4 This is a partial structural schematic diagram of a self-centering clamping device for a CNC rotary table of a circular workpiece according to a specific embodiment of the present invention.

[0059] Figure 5 This is a partial structural schematic diagram of a self-centering clamping device for a CNC rotary table of a circular workpiece according to a specific embodiment of the present invention.

[0060] Figure 6 for Figure 5 Enlarged view of part A;

[0061] Figure 7 for Figure 2 Enlarged view of part B;

[0062] Figure 8 for Figure 2 A schematic diagram of another embodiment of part B;

[0063] Figure 9 for Figure 2 A schematic diagram of another embodiment of part B;

[0064] Label Explanation:

[0065] 1. Base; 2. Turntable body; 3. Hydraulic chuck mechanism; 31. Chuck body; 32. Slider; 321. Third rack; 4. Support disc; 5. Rolling support mechanism; 6. First guide rail; 7. First sliding seat; 71. First rack; 8. Chuck seat adjustment assembly; 81. Chuck seat body; 811. Snap-fit ​​part; 812. Support part; 82. First fastener; 83. Second rack; 9. Oil supply assembly; 91. First oil supply support; 92. Hydraulic cylinder; 93. First... Integrated block; 94. First oil inlet connecting pipe; 95. First oil outlet connecting pipe; 96. Hydraulic station; 97. Second integrated block; 98. Second oil inlet connecting pipe; 99. Second oil outlet connecting pipe; 910. Hydraulic lock; 911. Third oil inlet connecting pipe; 912. Third oil outlet connecting pipe; 10. L-shaped connector; 101. Second fastener; 11. Auxiliary support mechanism; 111. Third guide rail; 112. Sliding support seat; 113. Third fastener; 12. Circular workpiece. Detailed Implementation

[0066] To explain in detail the technical content, objectives, and effects of the present invention, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0067] Example 1

[0068] Please refer to Figures 1 to 9 A self-centering clamping device for a CNC rotary table of a circular workpiece, comprising:

[0069] Base 1;

[0070] Turntable body 2, which is connected to the upper part of base 1;

[0071] A hydraulic chuck mechanism 3 is connected to the upper part of the turntable body 2. The hydraulic chuck mechanism 3 includes a chuck body 31 and a plurality of sliders 32. The plurality of sliders 32 are arranged in a circumferential array and are slidably connected to the chuck body 31. The plurality of sliders 32 are at the same distance from the central axis of the chuck body 31.

[0072] Supporting disk 4, which is connected to turntable body 2;

[0073] A rolling support mechanism 5, a plurality of the rolling support mechanisms 5 are arranged in a circumferential array on the base 1, and the lower part of the support disk 4 is rolledly connected to the rolling support mechanism 5;

[0074] First guide rail 6, multiple first guide rails 6 are connected to the upper part of the support disk 4 in a circumferential array, the number of first guide rails 6 is the same as the number of sliders 32, and the first guide rail 6 is parallel to the sliding direction of one of the sliders 32.

[0075] The first sliding seat 7 is slidably connected to the first guide rail 6. The first sliding seat 7 is connected to one of the sliders 32. The upper surface of the first sliding seat 7 is provided with a first toothed rack 71.

[0076] The card holder adjustment assembly 8 includes a card holder body 81 and a first fastener 82. The lower part of the card holder body 81 is provided with a second rack 83 that cooperates with the first rack 71. The card holder body 81 is connected to the upper part of the first sliding seat 7. The card holder body 81 includes a support part 812 for supporting the annular workpiece 12 and a snapping part 811 for snapping the outer or inner circumferential surface of the annular workpiece 12. The first fastener 82 is used for fastening the card holder body 81 to the first sliding seat 7.

[0077] Please refer to Figure 1 as well as Figure 7In one embodiment, the first rack 71 includes parallel and symmetrical rack units. A strip-shaped dovetail groove is provided between the two rack units as a second guide rail. A limiting member that slides with the dovetail groove is provided at the lower part of the chuck body 81 for limiting. The first fastener 82 can be a vertical screw. A vertical screw hole is provided at the position of the chuck body 81 facing the bottom of the dovetail groove. By tightening the screw in the screw hole, the bottom of the screw is tightly engaged with the bottom of the dovetail groove. By utilizing the engagement of the limiting member and the dovetail groove, the second rack 83 and the first rack 71 are tightly engaged. This connection structure ensures that after the first fastener 82 is locked, when the chuck body 81 is used to clamp the ring workpiece 12, even if the CNC machine tool applies a large force to the workpiece, the limiting engagement between the chuck body 81 and the first sliding seat 7 will not loosen, thus ensuring the machining accuracy of the ring workpiece 12.

[0078] Please refer to Figure 7 In the above structure, as one implementation, the tooth groove of the first rack 71 is in the shape of a straight line, and the tooth groove is perpendicular to the first guide rail 6.

[0079] Please refer to Figure 8 Furthermore, based on the above structure, in a further preferred embodiment, the tooth groove of the first rack 71 is in the shape of a straight line, and the included angle between the tooth groove and the first guide rail 6 is 30-60 degrees, preferably 45 degrees.

[0080] Please refer to Figure 9 Furthermore, based on the above structure, in a further preferred embodiment, the tooth groove of the first rack 71 is L-shaped, and the angle between any side of the L-shape and the first guide rail 6 is 30-60 degrees, preferably 45 degrees.

[0081] The above structure can further improve the stability of clamping the ring workpiece 12 and further prevent the chuck body 81 from slightly shifting in the direction perpendicular to the first guide rail 6 (to the side). Even if the CNC machine tool applies a large force to the workpiece, the limiting fit between the chuck body 81 and the first sliding seat 7 will not loosen.

[0082] Example 2

[0083] The self-centering clamping device for a CNC rotary table of a circular workpiece as described in Example 1 further includes an oil supply assembly 9, which comprises:

[0084] First oil supply support 91, the first oil supply support 91 is connected to base 1;

[0085] Hydraulic cylinder 92, the cylinder body of which is connected to the first oil supply support 91, and the moving direction of the hydraulic cylinder 92 is radial to the turntable body 2;

[0086] The first integrated block 93 is connected to the piston rod of the hydraulic cylinder 92;

[0087] The first oil inlet connecting pipe 94, the oil outlet end of the first oil inlet connecting pipe 94 is connected to the first integrated block 93;

[0088] The first oil outlet connecting pipe 95 has its oil inlet end connected to the first integrated block 93;

[0089] Hydraulic station 96, the oil inlet end of the first oil inlet connecting pipe 94 is connected to hydraulic station 96, and the oil outlet end of the first oil outlet connecting pipe 95 is connected to hydraulic station 96;

[0090] The second integrated block 97 is connected to the outer circumference of the support disk 4;

[0091] The second oil inlet connecting pipe 98 has its oil inlet end connected to the second integrated block 97, and the oil inlet end of the second oil inlet connecting pipe 98 and the oil outlet end of the first oil inlet connecting pipe 94 are at the same height.

[0092] The second oil outlet connecting pipe 99 has its oil outlet end at the same height as the oil inlet end of the first oil outlet connecting pipe 95.

[0093] Hydraulic lock 910, the oil outlet end of the second oil inlet connecting pipe 98 is connected to the hydraulic lock 910, and the oil inlet end of the second oil outlet connecting pipe 99 is connected to the hydraulic lock 910;

[0094] The third oil inlet connecting pipe 911 has its oil inlet end connected to the hydraulic lock 910 and its oil outlet end connected to the turntable body 2.

[0095] The third oil outlet connecting pipe 912 has its oil outlet end connected to the hydraulic lock 910 and its oil inlet end connected to the turntable body 2.

[0096] In the above structure, when the turntable body rotates to a certain angle, the first integrated block is directly opposite the second integrated block, the oil outlet end of the first oil inlet connecting pipe is aligned with the oil inlet end of the second oil inlet connecting pipe, and the oil inlet end of the first oil outlet connecting pipe is aligned with the oil outlet end of the second oil inlet connecting pipe. Both the oil inlet and outlet ends of the first and second oil inlet connecting pipes are equipped with quick-connect couplings. These quick-connect couplings protrude from the plane of the first integrated block facing the turntable body. Both the oil inlet and outlet ends of the second and second oil inlet connecting pipes are equipped with insertion holes that mate with the quick-connect couplings, allowing the hydraulic cylinder to move and engage or disengage the quick-connect couplings with the insertion holes. The oil supply support is equipped with a slide rail parallel to the hydraulic cylinder, and the integrated block is slidably connected to the slide rail. A proximity switch is located on one side of the slide rail.

[0097] In the above structure, the rotational and clamping accuracy requirements of the turntable body 2 are extremely high. Therefore, a linear scale is installed inside the turntable body 2. In the prior art, the oil supply line of the chuck body 31 is directly connected to the hydraulic chuck. This method requires the use of a rotary joint to ensure stable oil supply when the chuck body 31 rotates with the turntable body 2. However, to improve clamping accuracy, the sealing performance of the rotary joint is extremely important. But the seals are prone to aging after long-term use. Since the oil supply component 9 is located inside the clamping device, the difficulty of inspection and replacement of the seals is extremely high. If the auxiliary support rolling support mechanism 5 is used, the difficulty of inspection and replacement of the seals will be further increased. Therefore, this invention improves the structure and connection relationship of the oil supply component 9 in conjunction with the structure of the clamping device. The first oil supply support 91 and the hydraulic station 96 are set on the outside of the support disc 4. Only when the turntable body 2 stops rotating, the movement of the hydraulic cylinder 92 causes the first integrated block 93 and the second integrated block 97 to engage, thereby connecting the hydraulic station 96 and the chuck body 31. The oil supply pipeline is connected and locked by the hydraulic lock 910 connected at a specific position, realizing the clamping or loosening of the annular workpiece 12. When the turntable body 2 rotates, the first integrated block 93 and the second integrated block 97 are separated, that is, the hydraulic station 96 and the chuck body 31 do not need to be connected. Therefore, there is no need to set a rotary joint structure inside the chuck body 31, which can ensure the sealing of the chuck body 31 for a longer period of time. Since the hydraulic station 96 and the oil supply assembly 9 are both set on the outside of the support disc 4, maintenance is convenient.

[0098] Example 3

[0099] The self-centering clamping device for a CNC turntable of a circular workpiece as described in Example 1, wherein the upper surface of the slider 32 is provided with a third rack 321;

[0100] It also includes an L-shaped connector 10; one end of the L-shaped connector 10 is provided with a fourth rack that cooperates with the third rack 321, and the other end of the L-shaped connector 10 is connected to the first sliding seat 7;

[0101] It also includes a second fastener 101, which is used to fasten the L-shaped connector 10 to the slider 32.

[0102] In the above structure, the mating structure of the third rack 321 and the fourth rack can refer to the mating structure of the first rack 71 and the second rack 83. As a preferred embodiment, the tooth groove structure of the third rack 321 can refer to... Figures 7-9 The tooth groove structure of the first rack 71.

[0103] The above structure can correct the position of the slider 32 of the hydraulic chuck itself, ensuring that the shortest distance between the first sliding seat 7 and the central axis of the turntable body 2 remains consistent.

[0104] Example 4

[0105] The self-centering clamping device for a CNC turntable of a circular workpiece described in Example 1 has two vertically arranged clamping strips on the clamping part 811 of the clamping body 81.

[0106] In the above structure, when clamping the ring workpiece 12, the two clamping strips of the clamping part 811 contact the circumferential surface of the ring workpiece 12, which can be applied to clamping ring workpieces 12 of different diameters, further improving the clamping stability of the ring workpiece 12.

[0107] Example 5

[0108] In the self-centering clamping device for a CNC turntable of a circular workpiece described in Example 4, the surface of the clamping strip is arc-shaped.

[0109] Example 6

[0110] In the self-centering clamping device for a CNC turntable of a circular workpiece described in Example 1, a second guide rail is provided at the upper center of the first sliding seat 7, and the clamping body 81 is slidably connected to the second guide rail.

[0111] In the above structure, the movement direction of the card holder body 81 is restricted by the second guide rail. The second guide rail is parallel to the first guide rail 6. By restricting the movement direction of the card holder body 81 by the second guide rail, the card holder body 81 can only move along the direction of the second guide rail, thus avoiding the card holder body 81 from shifting to the side and affecting the centering and clamping accuracy of the annular workpiece 12.

[0112] Example 7

[0113] In the self-centering clamping device for a CNC turntable of a circular workpiece described in Example 1, each of the first sliding seats 7 has two clamp adjustment components 8 connected to its upper part, and the clamping parts 811 of the two clamp adjustment components 8 face opposite directions.

[0114] Please refer to Figure 5 By connecting two locking adjustment components 8 to the upper part of each of the first sliding seats 7, for a small-diameter circular workpiece 12, the outer ring of the circular workpiece 12 can be clamped by the locking part 811 facing the locking adjustment component 8 of the turntable body 2, and for a large-diameter circular workpiece 12, the inner ring of the circular workpiece 12 can be clamped by the locking part 811 facing away from the locking adjustment component 8 of the turntable body 2.

[0115] Example 8

[0116] Please refer to Figure 2 The self-centering clamping device for a CNC turntable of a circular workpiece described in Embodiment 1 further includes an auxiliary support mechanism 11, which comprises:

[0117] The third guide rail 111, a plurality of the third guide rails 111 are connected to the upper part of the support disk 4 in a circumferential array, and the direction of the third guide rail 111 is radial to the turntable body 2; each of the third guide rails 111 is located between two adjacent first guide rails 6;

[0118] A sliding support 112 is slidably connected to the third guide rail 111, and the sliding support 112 is used to assist in supporting the annular workpiece 12;

[0119] The third fastener 113 is used for fastening the connection between the sliding support 112 and the third guide rail 111.

[0120] The above-mentioned auxiliary support mechanism 11 is used to assist in supporting the lower part of the annular workpiece 12. The above structure can further improve the stability of the annular workpiece 12 clamping.

[0121] Example 9

[0122] Please refer to Figure 1 as well as Figure 2 In the self-centering clamping device for a CNC turntable of a circular workpiece described in Embodiment 1, the number of sliders 32 is 3, the number of first guide rails 6 is 3, the number of first sliding seats 7 is 3, and the number of third guide rails 111 is 3.

[0123] Example 10

[0124] Please refer to Figures 1 to 9 A self-centering clamping device for a CNC rotary table of a circular workpiece, comprising:

[0125] Base 1;

[0126] Turntable body 2, which is connected to the upper part of base 1;

[0127] A hydraulic chuck mechanism 3 is connected to the upper part of the turntable body 2. The hydraulic chuck mechanism 3 includes a chuck body 31 and a plurality of sliders 32. The plurality of sliders 32 are arranged in a circumferential array and are slidably connected to the chuck body 31. The plurality of sliders 32 are at the same distance from the central axis of the chuck body 31.

[0128] Supporting disk 4, which is connected to turntable body 2;

[0129] A rolling support mechanism 5, a plurality of the rolling support mechanisms 5 are arranged in a circumferential array on the base 1, and the lower part of the support disk 4 is rolledly connected to the rolling support mechanism 5;

[0130] First guide rail 6, multiple first guide rails 6 are connected to the upper part of the support disk 4 in a circumferential array, the number of first guide rails 6 is the same as the number of sliders 32, and the first guide rail 6 is parallel to the sliding direction of one of the sliders 32.

[0131] The first sliding seat 7 is slidably connected to the first guide rail 6. The first sliding seat 7 is connected to one of the sliders 32. The upper surface of the first sliding seat 7 is provided with a first toothed rack 71.

[0132] The card holder adjustment assembly 8 includes a card holder body 81 and a first fastener 82. The lower part of the card holder body 81 is provided with a second rack 83 that cooperates with the first rack 71. The card holder body 81 is connected to the upper part of the first sliding seat 7. The card holder body 81 includes a support part 812 for supporting the annular workpiece 12 and a snapping part 811 for snapping the outer or inner circumferential surface of the annular workpiece 12. The first fastener 82 is used for fastening the card holder body 81 to the first sliding seat 7.

[0133] Please refer to Figure 1 as well as Figure 7 In one embodiment, the first rack 71 includes parallel and symmetrical rack units. A strip-shaped dovetail groove is provided between the two rack units as a guide rail. A limiting member that slides with the dovetail groove is provided at the lower part of the chuck body 81 for limiting. The first fastener 82 can be a vertical screw. A vertical screw hole is provided at the position of the chuck body 81 facing the bottom of the dovetail groove. By tightening the screw in the screw hole, the bottom of the screw is tightly engaged with the bottom of the dovetail groove. The engagement of the limiting member and the dovetail groove makes the second rack 83 and the first rack 71 tightly engaged. This connection structure ensures that after the first fastener 82 is locked, when the chuck body 81 is used to clamp the ring workpiece 12, even if the CNC machine tool applies a large force to the workpiece, the limiting engagement between the chuck body 81 and the first sliding seat 7 will not loosen, thus ensuring the machining accuracy of the ring workpiece 12.

[0134] Please refer to Figure 7. In the above structure, as one embodiment, the tooth groove of the first rack 71 is in the shape of a straight line, and the tooth groove is perpendicular to the first guide rail 6.

[0135] Please refer to Figure 8 Furthermore, based on the above structure, in a further preferred embodiment, the tooth groove of the first rack 71 is in the shape of a straight line, and the included angle between the tooth groove and the first guide rail 6 is 30-60 degrees, preferably 45 degrees.

[0136] Please refer to Figure 9 Furthermore, based on the above structure, in a further preferred embodiment, the tooth groove of the first rack 71 is L-shaped, and the angle between any side of the L-shape and the first guide rail 6 is 30-60 degrees, preferably 45 degrees.

[0137] The above structure can further improve the stability of clamping the ring workpiece 12 and further prevent the chuck body 81 from slightly shifting in the direction perpendicular to the first guide rail 6 (to the side). Even if the CNC machine tool applies a large force to the workpiece, the limiting fit between the chuck body 81 and the first sliding seat 7 will not loosen.

[0138] It also includes an oil supply assembly 9, which includes:

[0139] First oil supply support 91, the first oil supply support 91 is connected to base 1;

[0140] Hydraulic cylinder 92, the cylinder body of which is connected to the first oil supply support 91, and the moving direction of the hydraulic cylinder 92 is radial to the turntable body 2;

[0141] The first integrated block 93 is connected to the piston rod of the hydraulic cylinder 92;

[0142] The first oil inlet connecting pipe 94, the oil outlet end of the first oil inlet connecting pipe 94 is connected to the first integrated block 93;

[0143] The first oil outlet connecting pipe 95 has its oil inlet end connected to the first integrated block 93;

[0144] Hydraulic station 96, the oil inlet end of the first oil inlet connecting pipe 94 is connected to hydraulic station 96, and the oil outlet end of the first oil outlet connecting pipe 95 is connected to hydraulic station 96;

[0145] The second integrated block 97 is connected to the outer circumference of the support disk 4;

[0146] The second oil inlet connecting pipe 98 has its oil inlet end connected to the second integrated block 97, and the oil inlet end of the second oil inlet connecting pipe 98 and the oil outlet end of the first oil inlet connecting pipe 94 are at the same height.

[0147] The second oil outlet connecting pipe 99 has its oil outlet end at the same height as the oil inlet end of the first oil outlet connecting pipe 95.

[0148] Hydraulic lock 910, the oil outlet end of the second oil inlet connecting pipe 98 is connected to the hydraulic lock 910, and the oil inlet end of the second oil outlet connecting pipe 99 is connected to the hydraulic lock 910;

[0149] The third oil inlet connecting pipe 911 has its oil inlet end connected to the hydraulic lock 910 and its oil outlet end connected to the turntable body 2.

[0150] The third oil outlet connecting pipe 912 has its oil outlet end connected to the hydraulic lock 910 and its oil inlet end connected to the turntable body 2.

[0151] In the above structure, the rotational and clamping accuracy requirements of the turntable body 2 are extremely high. Therefore, a linear scale is installed inside the turntable body 2. In the prior art, the oil supply line of the chuck body 31 is directly connected to the hydraulic chuck. This method requires the use of a rotary joint to ensure stable oil supply when the chuck body 31 rotates with the turntable body 2. However, to improve clamping accuracy, the sealing performance of the rotary joint is extremely important. But the seals are prone to aging after long-term use. Since the oil supply component 9 is located inside the clamping device, the difficulty of inspection and replacement of the seals is extremely high. If the auxiliary support rolling support mechanism 5 is used, the difficulty of inspection and replacement of the seals will be further increased. Therefore, this invention improves the structure and connection relationship of the oil supply component 9 in conjunction with the structure of the clamping device. The first oil supply support 91 and the hydraulic station 96 are set on the outside of the support disc 4. Only when the turntable body 2 stops rotating, the movement of the hydraulic cylinder 92 causes the first integrated block 93 and the second integrated block 97 to engage, thereby connecting the hydraulic station 96 and the chuck body 31. The oil supply pipeline is connected and locked by the hydraulic lock 910 connected at a specific position, realizing the clamping or loosening of the annular workpiece 12. When the turntable body 2 rotates, the first integrated block 93 and the second integrated block 97 are separated, that is, the hydraulic station 96 and the chuck body 31 do not need to be connected. Therefore, there is no need to set a rotary joint structure inside the chuck body 31, which can ensure the sealing of the chuck body 31 for a longer period of time. Since the hydraulic station 96 and the oil supply assembly 9 are both set on the outside of the support disc 4, maintenance is convenient.

[0152] The upper surface of the slider 32 is provided with a third toothed rack 321;

[0153] It also includes an L-shaped connector 10; one end of the L-shaped connector 10 is provided with a fourth rack that cooperates with the third rack 321, and the other end of the L-shaped connector 10 is connected to the first sliding seat 7;

[0154] It also includes a second fastener 101, which is used to fasten the L-shaped connector 10 to the slider 32.

[0155] In the above structure, the mating structure of the third rack 321 and the fourth rack can refer to the mating structure of the first rack 71 and the second rack 83. As a preferred embodiment, the tooth groove structure of the third rack 321 can refer to... Figures 7-9 The tooth groove structure of the first rack 71.

[0156] The above structure can correct the position of the slider 32 of the hydraulic chuck itself, ensuring that the shortest distance between the first sliding seat 7 and the central axis of the turntable body 2 remains consistent.

[0157] The card holder body 81 has two vertically arranged card strips on its card contact part 811.

[0158] In the above structure, when clamping the ring workpiece 12, the two clamping strips of the clamping part 811 contact the circumferential surface of the ring workpiece 12, which can be applied to clamping ring workpieces 12 of different diameters, further improving the clamping stability of the ring workpiece 12.

[0159] The surface of the snap-fit ​​strip is arc-shaped.

[0160] The upper center of the first sliding seat 7 is provided with a second guide rail, and the card holder body 81 is slidably connected to the second guide rail.

[0161] In the above structure, the movement direction of the card holder body 81 is restricted by the second guide rail. The second guide rail is parallel to the first guide rail 6. By restricting the movement direction of the card holder body 81 by the second guide rail, the card holder body 81 can only move along the direction of the second guide rail, thus avoiding the card holder body 81 from shifting to the side and affecting the centering and clamping accuracy of the annular workpiece 12.

[0162] Each of the first sliding seats 7 has two card holder adjustment components 8 connected to its upper part, and the locking parts 811 of the two card holder adjustment components 8 face opposite directions.

[0163] Please refer to Figure 5 By connecting two locking adjustment components 8 to the upper part of each of the first sliding seats 7, for a small-diameter circular workpiece 12, the outer ring of the circular workpiece 12 can be clamped by the locking part 811 facing the locking adjustment component 8 of the turntable body 2, and for a large-diameter circular workpiece 12, the inner ring of the circular workpiece 12 can be clamped by the locking part 811 facing away from the locking adjustment component 8 of the turntable body 2.

[0164] It also includes an auxiliary support mechanism 11, which includes:

[0165] The third guide rail 111, a plurality of the third guide rails 111 are connected to the upper part of the support disk 4 in a circumferential array, and the direction of the third guide rail 111 is radial to the turntable body 2; each of the third guide rails 111 is located between two adjacent first guide rails 6;

[0166] A sliding support 112 is slidably connected to the third guide rail 111, and the sliding support 112 is used to assist in supporting the annular workpiece 12;

[0167] The third fastener 113 is used for fastening the connection between the sliding support 112 and the third guide rail 111.

[0168] The above-mentioned auxiliary support mechanism 11 is used to assist in supporting the lower part of the annular workpiece 12. The above structure can further improve the stability of the annular workpiece 12 clamping.

[0169] The number of sliders 32 is 3, the number of first guide rails 6 is 3, the number of first sliding seats 7 is 3, and the number of third guide rails 111 is 3.

[0170] Example 11

[0171] The method for clamping a circular workpiece using the self-centering clamping device of the CNC rotary table described in Example 10 includes the following steps:

[0172] Step 1: Adjust the connection position of the first sliding seat 7 on the first guide rail 6 so that the vertical distance between each first sliding seat 7 and the axis of the turntable body 2 is the same. Adjust the connection position of the card holder body 81 on the first sliding seat 7 so that the vertical distance between each card holder body 81 and the axis of the turntable body 2 is the same. The first fastener 82 secures the card holder body 81 to the first sliding seat 7.

[0173] Step 2: Control the hydraulic cylinder 92 to move so that the oil outlet end of the first oil inlet connecting pipe 94 is connected to the oil inlet end of the second oil inlet connecting pipe 98, and the oil inlet end of the first oil outlet connecting pipe 95 is connected to the oil outlet end of the second oil outlet connecting pipe 99.

[0174] Step 3: Place the circular workpiece 12 on the support part 812 of each chuck body 81, control the hydraulic station 96 to supply oil to the chuck body 31 or the hydraulic chuck to supply oil to the hydraulic station 96, and control the oil inlet or oil outlet of the hydraulic lock 910 to lock, so that each slider 32 of the chuck body 31 moves synchronously, so that the locking part 811 of the chuck body 81 clamps the inner circumference or outer circumference of the circular workpiece 12.

[0175] Step 4: Control the oil inlet and outlet directions of the hydraulic lock 910 to lock, and control the hydraulic cylinder 92 to move so that the oil outlet end of the first oil inlet connecting pipe 94 is disconnected from the oil inlet end of the second oil inlet connecting pipe 98, and the oil inlet end of the first oil outlet connecting pipe 95 is disconnected from the oil outlet end of the second oil outlet connecting pipe 99.

[0176] Step 5: Control the rotation of the turntable body 2 and use a CNC machine tool to process the circular workpiece 12;

[0177] Step 6: After the CNC machine tool finishes machining, control the rotary table body 2 to rotate to the position where the first integrated block 93 and the second integrated block 97 are opposite, and then stop rotating;

[0178] Step 7: Control the hydraulic cylinder 92 to move so that the oil outlet end of the first oil inlet connecting pipe 94 is connected to the oil inlet end of the second oil inlet connecting pipe 98, and the oil inlet end of the first oil outlet connecting pipe 95 is connected to the oil outlet end of the second oil outlet connecting pipe 99.

[0179] Step 8: Control the oil inlet or outlet direction of the hydraulic lock 910 to open, so that each slider 32 of the chuck body 31 moves synchronously, so that the locking part 811 of the chuck body 81 loosens its clamping on the inner or outer circumference of the ring workpiece 12, and remove the ring workpiece 12.

[0180] In the above method, there are two situations in steps 3-7, corresponding to two clamping control methods. One method uses the clamping part 811 facing the turntable body 2 to clamp the outer ring of the smaller diameter circular workpiece 12. The other method uses the clamping part 811 facing away from the turntable body 2 to clamp the inner ring of the larger diameter circular workpiece 12. Correspondingly, in the above two clamping methods, the moving direction of the slider 32 is opposite. Correspondingly, the hydraulic lock 910 needs to be programmed separately according to the above two clamping methods.

[0181] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent modifications made based on the content of the present invention specification and drawings, or direct or indirect applications in related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A high-precision CNC rotary table self-centering clamping device for circular workpieces, characterized in that, include: Base; A turntable body, which is connected to the upper part of the base; A hydraulic chuck mechanism is connected to the upper part of the turntable body. The hydraulic chuck mechanism includes a chuck body and multiple sliders. The multiple sliders are arranged in a circumferential array and slidably connected to the chuck body. The multiple sliders are equidistant from the central axis of the chuck body. A support disk is connected to the turntable body; A rolling support mechanism, wherein multiple rolling support mechanisms are arranged in a circumferential array on the base, and the lower part of the support disk is tactilely connected to the rolling support mechanism; The first guide rail, and a plurality of the first guide rails are connected to the upper part of the support disk in a circular array. The number of the first guide rails is the same as the number of sliders. The first guide rails are parallel to the sliding direction of one of the sliders. The first sliding seat is slidably connected to the first guide rail and is connected to one of the sliders. The upper surface of the first sliding seat is provided with a first toothed rack. A card holder adjustment assembly includes a card holder body and a first fastener. The lower part of the card holder body is provided with a second rack that cooperates with a first rack. The card holder body is connected to the upper part of a first sliding seat. The card holder body includes a support part for supporting a circular workpiece and a snapping part for snapping onto the outer or inner circumferential surface of the circular workpiece. The first fastener is used for fastening the card holder body and the first sliding seat. The first rack includes parallel and symmetrical rack units. A strip-shaped dovetail groove is provided between the two rack units as a second guide rail. A limiting member that slides with the dovetail groove is provided at the lower part of the card holder body for limiting. The first fastener is a vertical screw. A vertical screw hole is provided at the position of the card holder body directly opposite the bottom of the dovetail groove. The screw is tightened in the screw hole so that the bottom of the screw fits tightly with the bottom of the dovetail groove.

2. The high-precision circular workpiece CNC rotary table self-centering clamping device according to claim 1, characterized in that, It also includes an oil supply assembly, which includes: First oil supply support, the first oil supply support is connected to the base; A hydraulic cylinder, wherein the cylinder body is connected to a first oil supply support, and the moving direction of the hydraulic cylinder is radial to the turntable body; A first integrated block is connected to the piston rod of the hydraulic cylinder; The first oil inlet connecting pipe, the oil outlet end of the first oil inlet connecting pipe is connected to the first integrated block; The first oil outlet connecting pipe has its oil inlet end connected to the first integrated block; The hydraulic station has an oil inlet end connected to the hydraulic station and an oil outlet end connected to the hydraulic station. The second integrated block is connected to the outer circumference of the support disk; The second oil inlet connecting pipe has its oil inlet end connected to the second integrated block, and the oil inlet end of the second oil inlet connecting pipe is at the same height as the oil outlet end of the first oil inlet connecting pipe. The second oil outlet connection pipe has its oil outlet end at the same height as the oil inlet end of the first oil outlet connection pipe. A hydraulic lock, wherein the oil outlet end of the second oil inlet connecting pipe is connected to the hydraulic lock, and the oil inlet end of the second oil outlet connecting pipe is connected to the hydraulic lock; The third oil inlet connection pipe has its inlet end connected to the hydraulic lock and its outlet end connected to the turntable body. The third oil outlet connection pipe has its oil outlet end connected to the hydraulic lock and its oil inlet end connected to the turntable body.

3. The high-precision circular workpiece CNC rotary table self-centering clamping device according to claim 2, characterized in that, The upper surface of the slider is provided with a third toothed rack; It also includes an L-shaped connector; one end of the L-shaped connector is provided with a fourth rack that cooperates with the third rack, and the other end of the L-shaped connector is connected to the first sliding seat; It also includes a second fastener for securing the L-shaped connector to the slider.

4. The high-precision circular workpiece CNC rotary table self-centering clamping device according to claim 2, characterized in that, The card holder body has two vertically arranged card strips on the card-attaching part.

5. The high-precision circular workpiece CNC rotary table self-centering clamping device according to claim 4, characterized in that, The surface of the snap-fit ​​strip is arc-shaped.

6. The high-precision circular workpiece CNC rotary table self-centering clamping device according to claim 2, characterized in that, The upper center of the first sliding seat is provided with a second guide rail, and the card holder body is slidably connected to the second guide rail.

7. The high-precision circular workpiece CNC rotary table self-centering clamping device according to claim 2, characterized in that, Two locking adjustment components are connected to the upper part of each of the first sliding seats, and the locking parts of the two locking adjustment components face opposite directions.

8. The high-precision circular workpiece CNC rotary table self-centering clamping device according to claim 2, characterized in that, It also includes an auxiliary support mechanism, which includes: The third guide rail, a plurality of the third guide rails are connected to the upper part of the support disk in a circumferential array, and the direction of the third guide rail is the radial direction of the turntable body; each of the third guide rails is located between two adjacent first guide rails; A sliding support base is slidably connected to the third guide rail, and the sliding support base is used to assist in supporting the annular workpiece; The third fastener is used for the fastening connection between the sliding support and the third guide rail.

9. The high-precision circular workpiece CNC rotary table self-centering clamping device according to claim 8, characterized in that, The number of sliders is 3, the number of first guide rails is 3, the number of first sliding blocks is 3, and the number of third guide rails is 3.

10. The method for clamping a circular workpiece using the high-precision CNC rotary table self-centering clamping device for circular workpieces according to any one of claims 2-9, characterized in that, Includes the following steps: Step 1: Adjust the connection position of the first sliding seat on the first guide rail so that the vertical distance between each first sliding seat and the axis of the turntable body is the same. Adjust the connection position of the card holder body on the first sliding seat so that the vertical distance between each card holder body and the axis of the turntable body is the same. The first fastener securely connects the card holder body to the first sliding seat. Step 2: Control the movement of the hydraulic cylinder so that the oil outlet end of the first oil inlet connection pipe is connected to the oil inlet end of the second oil inlet connection pipe, and the oil outlet end of the first oil outlet connection pipe is connected to the oil outlet end of the second oil outlet connection pipe. Step 3: Place the ring workpiece on the support part of each chuck body, control the hydraulic station to supply oil to the chuck body or the hydraulic chuck to supply oil to the hydraulic station, and control the oil inlet or oil outlet lock of the hydraulic lock so that each slider of the chuck body moves synchronously and the locking part of the chuck body clamps the inner or outer circumference of the ring workpiece. Step 4: Control the oil inlet and outlet directions of the hydraulic lock to lock, and control the movement of the hydraulic cylinder to disengage the oil outlet end of the first oil inlet connecting pipe from the oil inlet end of the second oil inlet connecting pipe, and disengage the oil inlet end of the first oil outlet connecting pipe from the oil outlet end of the second oil outlet connecting pipe. Step 5: Control the rotation of the turntable body and use a CNC machine tool to process the circular workpiece; Step 6: After the CNC machine tool finishes machining, control the rotary table body to rotate to the position where the first integrated block and the second integrated block are opposite each other, and then stop rotating; Step 7: Control the movement of the hydraulic cylinder so that the oil outlet end of the first oil inlet connection pipe is connected to the oil inlet end of the second oil inlet connection pipe, and the oil outlet end of the first oil outlet connection pipe is connected to the oil outlet end of the second oil outlet connection pipe. Step 8: Control the oil inlet or outlet direction of the hydraulic lock to open, so that each slider of the chuck body moves synchronously, so that the locking part of the chuck body loosens its clamping on the inner or outer circumference of the ring workpiece, and remove the ring workpiece.

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