An axial hydraulic clamping mechanism for a numerical control rotary table

Abstract

The present application belongs to the technical field of machining, and particularly relates to an axial hydraulic clamping mechanism for a numerical control rotary table. The axial hydraulic clamping mechanism mainly comprises a rotating part and a fixed part. The rotating part is connected with the rotary table, a rotary shaft, a connecting disc and a dynamic friction plate through a screw. The fixed part comprises a base box, an oil cylinder seat and an oil cylinder ring, and inner and outer sealing rings. The clamping part comprises an outer static friction plate and an inner static friction plate, and is driven by the inner and outer sealing rings to realize a bidirectional clamping function and increase a locking torque. The design utilizes the 'piston' action of the sealing ring, simplifies the structure, is simple in machining process, low in cost, and suitable for numerical control rotary table functional components.

Description

Technical Field

[0001] This invention belongs to the field of machining technology, specifically relating to an axial hydraulic clamping mechanism for a CNC rotary table. Background Technology

[0002] The CNC rotary table is one of the key functional components of high-end CNC machine tools. It is commonly used in high-performance CNC machine tools such as vertical / horizontal machining centers, CNC boring and milling machines, gantry machining centers, and vertical turning-milling-grinding composite machining centers. It enables parts to be indexed and positioned at specific angles or to continuously feed and cut along the circumferential direction. When used as a rotary feed axis, it can be linked with a linear feed axis to achieve the machining of complex spatial curved surfaces.

[0003] CNC rotary tables are generally equipped with clamping mechanisms. After the table is indexed and positioned at a certain angle, the clamping mechanism applies a circumferential locking force to the table, achieving precise indexing and locking between the table and the workpiece. This is commonly used to rotate a workpiece by a certain angle before machining features such as surfaces, grooves, bosses, holes, and threads. By locking the table, better cutting rigidity, machining accuracy, and surface finish can be achieved, while preventing cutting vibration.

[0004] Based on the different power sources for locking, clamping mechanisms can be divided into hydraulic clamping and pneumatic clamping. Generally, hydraulic clamping is used for situations requiring higher locking forces, while pneumatic clamping mechanisms have relatively lower locking forces. According to the different locking methods and mechanical structures, clamping mechanisms are divided into disc clamping mechanisms (axial clamping) and ring clamping mechanisms (radial clamping). When designing a clamping mechanism, the locking torque requirement must be met first. Secondly, the structure should be compact, the mechanism simple, the locking action flexible and reliable, and the clamping rigidity high. Furthermore, sufficient locking accuracy must be guaranteed; the clamping mechanism should not disturb the positional accuracy of the worktable during locking and releasing, thus compromising the existing indexing and positioning accuracy of the worktable. Locking accuracy is a crucial indicator of the performance of a clamping mechanism and also the greatest challenge in its design and manufacture.

[0005] The internal structure of a CNC rotary table is complex and space-constrained. Therefore, the clamping mechanism must be compact, simple, and reliable, while also possessing high locking torque and high locking accuracy. Currently, domestic and international CNC rotary table manufacturers generally use disc-type and ring-type clamping mechanisms. Although the specific structures of each product differ, the underlying principle is essentially the same: hydraulic (or pneumatic) action causes localized deformation of the elastic element, pressing (or clamping) the table (or rotating shaft) and generating a frictional locking torque. When releasing, the hydraulic (or pneumatic) action is released, allowing the elastic element to recover its deformation, releasing the table (or rotating shaft) and causing it to unwind. The structural design and manufacturing precision of the elastic element are crucial to the entire clamping mechanism. To achieve localized deformation, the elastic element is typically designed as a locally thin-walled part, made of alloy spring steel, and subjected to quenching and medium-temperature tempering to obtain a high elastic limit strength, adapting to operating conditions requiring frequent, minute elastic deformation. Meanwhile, to meet the clamping accuracy requirements, the elastic element must have high dimensional and shape accuracy, making its machining and manufacturing extremely difficult. Thin-walled parts inherently have poor rigidity, are prone to vibration during machining, making it difficult to guarantee accuracy. They are also prone to deformation and cracking during quenching, and their accuracy is unstable after heat treatment. This poses significant challenges to machining and heat treatment processes, resulting in high manufacturing costs and often unsatisfactory performance. Summary of the Invention

[0006] (a) Technical problems to be solved

[0007] This invention addresses the problems of clamping accuracy, clamping torque, and structural complexity in existing CNC rotary table clamping mechanisms. It proposes an axial hydraulic clamping mechanism for CNC rotary tables, aiming to improve clamping accuracy and torque while simplifying mechanism design to enhance processing efficiency and reliability.

[0008] (II) Technical Solution

[0009] To achieve the above objectives, the present invention provides an axial hydraulic clamping mechanism for a CNC rotary table, comprising:

[0010] A rotating component includes a rotary table, a rotary shaft, a connecting plate, and a dynamic friction plate. The rotary table and the rotary shaft are connected and fixed together by screws. The dynamic friction plate is mounted on the connecting plate and fixed together with the rotary shaft and the rotary table by screws so that it rotates together with the rotary table.

[0011] A fixed component includes a base housing, a cylinder seat, an outer cylinder ring, an inner cylinder ring, an outer sealing ring, and an inner sealing ring. The cylinder seat, the outer cylinder ring, and the inner cylinder ring are fixedly installed on the base housing. The outer cylinder ring and the cylinder seat form an outer annular oil cavity, and the outer sealing ring is installed in the outer annular oil cavity. The inner cylinder ring and the cylinder seat form an inner annular oil cavity, and the inner sealing ring is installed in the inner annular oil cavity. The cylinder seat is provided with an oil injection hole, and both the outer and inner sealing rings have slots, with each slot communicating with the oil injection hole.

[0012] A turntable bearing, wherein the inner ring of the turntable bearing is fixedly connected to the rotating shaft, and the outer ring of the turntable bearing is fixedly connected to the base housing;

[0013] The locking component includes an outer static friction plate, an inner static friction plate, an outer locking disc, and an inner locking disc. The outer static friction plate and the inner static friction plate each include a fixed end and a free end. The fixed end of the outer static friction plate and the outer locking disc are fixedly installed on the outer ring of the hydraulic cylinder. The fixed end of the inner static friction plate and the inner locking disc are fixedly installed on the inner ring of the hydraulic cylinder.

[0014] Wherein, the free end of the outer static friction plate covers the upper surface of the outer sealing ring along the side away from the groove, and is located between the upper surface of the outer sealing ring and the lower surface of the dynamic friction plate. The outer side of the dynamic friction plate is located between the outer locking disc and the free end of the outer static friction plate, so that the free end of the outer static friction plate is deformed by the outer sealing ring, so that the outer side of the dynamic friction plate is in close contact with the outer locking disc.

[0015] The free end of the inner static friction plate covers the upper surface of the inner sealing ring along the side away from the groove, and is located between the upper surface of the inner sealing ring and the lower surface of the dynamic friction plate. The inner side of the dynamic friction plate is located between the inner locking disc and the free end of the inner static friction plate, so that the free end of the inner static friction plate is deformed by the inner sealing ring, so that the inner side of the dynamic friction plate is in close contact with the inner locking disc.

[0016] Furthermore, the dynamic friction plate, the inner static friction plate, and the outer static friction plate are all elastic elements.

[0017] Furthermore, the dynamic friction plate, the inner static friction plate, and the outer static friction plate are directly cut from Grade I strength heat-treated spring steel strips.

[0018] Furthermore, when the clamping mechanism is in an unlocked state, the moving friction plate does not contact either the outer locking plate or the inner locking plate.

[0019] Furthermore, the fixing component also includes a sealing ring; the fixed connection between the cylinder seat and the base housing is achieved by: the sealing ring being fixedly connected to the cylinder seat by screws, and the sealing ring being fixedly connected to the base housing by screws.

[0020] Furthermore, the fixing component also includes an adjusting shim, which is located between the sealing ring and the cylinder seat.

[0021] Furthermore, an O-ring is provided on the mounting surface between the outer ring of the cylinder and the cylinder seat.

[0022] Furthermore, an O-ring is provided on the mounting surface between the inner ring of the cylinder and the cylinder seat.

[0023] Furthermore, both the outer sealing ring and the inner sealing ring are U-shaped sealing rings, and both grooves are U-shaped openings.

[0024] Furthermore, the cylinder seat is provided with two oil injection holes, one of which is connected to the groove of the outer sealing ring, and the other of which is connected to the groove of the inner sealing ring.

[0025] (III) Beneficial Effects

[0026] Compared with existing technologies, the axial hydraulic clamping mechanism for CNC rotary tables provided by this invention achieves bidirectional clamping by employing two sets of sealing rings (i.e., an outer sealing ring and an inner sealing ring) and static friction plates (an outer static friction plate and an inner static friction plate). This allows for a greater locking torque within a limited structural space. The static and dynamic friction plates of the clamping components adopt a disc-type design, resulting in a more compact structure and smaller axial dimensions, making them suitable for placement in functional components such as CNC rotary tables. Furthermore, in addition to sealing the hydraulic oil, the outer and inner sealing rings also act as "pistons," transmitting power to the static friction plates, further simplifying the mechanism and enhancing reliability. The dynamic and static friction plates, as elastic elements in the clamping mechanism, have simple shapes and structures, are easy to process, and have relatively low manufacturing costs. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of a CNC rotary table disclosed in this application.

[0028] Figure 2 This is an overall sectional view of a CNC rotary table disclosed in this application.

[0029] Figure 3 This is a partially enlarged view of an axial hydraulic clamping mechanism for a CNC rotary table disclosed in this application.

[0030] Figure 4This is a partial enlarged view of a hydraulic clamping mechanism disclosed in this application when the worktable is in the released state.

[0031] Figure 5 This is a partial enlarged view of a hydraulic clamping mechanism disclosed in this application when it is in the locked state on the worktable.

[0032] The reference numerals in the figure are as follows: 1. Rotary worktable; 2. Rotary table bearing; 3. Base housing; 4. Rotary shaft; 5. Connecting disc; 6. Sealing ring; 7. Adjusting shim; 8. Outer locking disc; 9. Outer static friction plate; 10. Outer ring of hydraulic cylinder; 11. Outer sealing ring; 12. Hydraulic cylinder seat; 13. Dynamic friction plate; 14. Inner sealing ring; 15. Inner ring of hydraulic cylinder; 16. Inner static friction plate; 17. Inner locking disc. Detailed Implementation

[0033] The present invention will now be described in detail with reference to the accompanying drawings, and the technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] It should be noted that when a component is described as "fixed to" another component, it can be directly on the other component or may have a component in between. When a component is considered "connected to" another component, it can be directly connected to the other component or may have a component in between. When a component is considered "set on" another component, it can be directly set on the other component or may have a component in between. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0036] Please see Figure 1 As shown in the preferred embodiment of this application, an axial hydraulic clamping mechanism for a CNC rotary table is provided for clamping and locking the rotary table 1. The axial hydraulic clamping mechanism includes a rotating component, a fixed component, a rotary table bearing 2, and a locking component.

[0037] like Figure 2 , Figure 3As shown, the rotating component includes a rotary table 1, a rotary shaft 4, a connecting plate 5, and a dynamic friction plate 13. The rotary table 1 and the rotary shaft 4 are connected and fixed together by screws. The dynamic friction plate 13 is mounted on the connecting plate 5 by screws and fixed together with the rotary shaft 4 and the rotary table 1 by screws, so that it can rotate together with the rotary table 1 under the drive of the motor.

[0038] like Figure 3 As shown, the fixing components include a base housing 3, a cylinder seat 12, an outer cylinder ring 10, an inner cylinder ring 15, an outer sealing ring 11, and an inner sealing ring 14; the cylinder seat 12, the outer cylinder ring 10, and the inner cylinder ring 15 are fixedly installed on the base housing 3, wherein the outer cylinder ring 10 and the cylinder seat 12 form an outer annular oil cavity, i.e. Figure 3 Mark A indicates that the outer sealing ring 11 is installed in the outer annular oil cavity; an inner annular oil cavity is formed between the inner ring 15 of the oil cylinder and the oil cylinder seat 12, i.e. Figure 3 Mark B indicates that the inner sealing ring 14 is installed in the inner annular oil cavity; the cylinder seat 12 is provided with an oil injection hole, and both the outer sealing ring 11 and the inner sealing ring 14 have slots, which are respectively connected to the oil injection hole, allowing high-pressure hydraulic oil to be introduced into the outer annular oil cavity and the inner annular oil cavity, pushing the outer sealing ring 11 and the inner sealing ring 14 to move upwards. Figure 3 As can be seen, in this embodiment, the oil injection hole is opened from the end face of the cylinder seat 12 toward the groove and extends through to each groove.

[0039] The inner ring of the turntable bearing 2 is fixed to the rotary shaft 4 with screws, and the outer ring of the turntable bearing 2 is fixed to the base box 3 with screws. The rotary table 1 makes continuous rotary motion under the drive of the motor.

[0040] like Figure 3 As shown, the locking components include an outer static friction plate 9, an inner static friction plate 16, an outer locking disc 8, and an inner locking disc 17. Both the outer static friction plate 9 and the inner static friction plate 16 include a fixed end and a free end. The fixed end of the outer static friction plate 9 and the outer locking disc 8 are fixedly installed on the outer ring 10 of the hydraulic cylinder; the fixed end of the inner static friction plate 16 and the inner locking disc 17 are fixedly installed on the inner ring 15 of the hydraulic cylinder.

[0041] The free end of the outer static friction plate 9 covers the upper surface of the outer sealing ring 11 along the side away from the groove of the outer sealing ring 11, and is located between the upper surface of the outer sealing ring 11 and the lower surface of the dynamic friction plate 13. The outer side of the dynamic friction plate 13 is located between the outer locking plate 8 and the free end of the outer static friction plate 9, so that after the high pressure hydraulic oil is introduced, the outer sealing ring 11 pushes the free end of the outer static friction plate 9 to deform, so that the outer side of the dynamic friction plate 13 deforms and comes into close contact with the outer locking plate 8.

[0042] The free end of the inner static friction plate 16 covers the upper surface of the inner sealing ring 14 along the side away from the groove of the inner sealing ring 14, and is located between the upper surface of the inner sealing ring 14 and the lower surface of the dynamic friction plate 13. The inner side of the dynamic friction plate 13 is located between the inner locking disc 17 and the free end of the inner static friction plate 16, so that after high-pressure hydraulic oil is introduced, the inner sealing ring 14 drives the free end of the inner static friction plate 16 to deform, so that the inner side of the dynamic friction plate 13 is in close contact with the inner locking disc 17.

[0043] In this embodiment, the outer sealing ring 11 and the inner sealing ring 14 play a dual role in the present invention: on the one hand, they act as seals in the axial hydraulic clamping mechanism to prevent hydraulic oil from leaking in the outer annular oil chamber and the inner annular oil chamber; on the other hand, when high-pressure hydraulic oil is injected, these sealing rings also act as pistons, pushing the outer static friction plate 9 and the inner static friction plate 16, thereby transmitting power to realize the clamping action of the dynamic friction plate 13, enhancing the clamping effect of the mechanism and simplifying the overall structure.

[0044] The working process of this embodiment is as follows:

[0045] When the clamping mechanism locks, high-pressure hydraulic oil is injected into the outer annular oil chamber and the inner annular oil chamber, i.e., oil chambers A and B, through the hydraulic lines. Under the action of oil pressure, the outer sealing ring 11 and the inner sealing ring 14 move upward simultaneously, squeezing the free ends of the outer static friction plate 9 and the inner static friction plate 16 respectively, causing them to deform under pressure and continue to move upward. At the same time, they squeeze the moving friction plate 13, causing it to deform under pressure and move upward together, finally pressing it against the outer locking plate 8 and the inner locking plate 17. Through the action of hydraulic oil, the moving friction plate 13 is clamped between the outer static friction plate 9 and the outer locking plate 8, and between the inner static friction plate 16 and the inner locking plate 17, realizing the clamping and locking of the moving friction plate 13 and the rotary worktable 1. Figure 5 .

[0046] When the clamping mechanism is released, by cutting off the hydraulic oil and releasing the oil pressure, the outer static friction plate 9, the inner static friction plate 16, and the moving friction plate 13, under their own rebound force, recover their elastic deformation and return to their initial positions. Thus, the moving friction plate 13 separates from the outer static friction plate 9 and the outer locking disc 8, and from the inner static friction plate 16 and the inner locking disc 17, respectively. Simultaneously, during the recovery process, the outer static friction plate 9 and the inner static friction plate 16 push the outer sealing ring 11 and the inner sealing ring 14 downwards, returning them to their initial positions, thereby releasing the worktable from the locking state. Figure 4 .

[0047] In this embodiment, the dynamic friction plate 13, the inner static friction plate 16, and the outer static friction plate 9 serve as elastic elements in the clamping mechanism. They have simple shapes and structures, are directly cut from Grade I strength heat-treated spring steel strips, and do not require secondary heat treatment. The required dimensional accuracy and parallelism requirements can be achieved by flat grinding the two end faces. The processing technology is simple and the manufacturing cost is relatively low.

[0048] In this embodiment, when the clamping mechanism is in the unlocked state, the moving friction plate 13 is not in contact with the outer locking plate 8 and the inner locking plate 17. When in contact, the gap between the moving friction plate 13 and the inner stationary friction plate 16, the outer stationary friction plate 9, the inner locking plate 17, and the outer locking plate 8 can be controlled by grinding relevant parts. By reasonably controlling the gap values ​​between the moving friction plate 13, the inner stationary friction plate 16 and the outer stationary friction plate 9, and the outer locking plate 8 and the inner locking plate 17, it can be ensured that when the clamping mechanism is released, the moving friction plate 13 is completely released and can rotate without obstruction; at the same time, when the clamping mechanism is locked, the deformation of each friction plate should be as small as possible to reduce the internal deformation stress of the friction plate, improve the fatigue life of the friction plate, and also reduce the deformation resistance of the friction plate, so as to obtain a larger locking torque under the same hydraulic oil pressure.

[0049] In this embodiment, the fixing components also include a sealing ring 6 and an adjusting shim 7; the fixed connection between the cylinder seat 12 and the base housing 3 is achieved by: the sealing ring 6 being fixedly connected to the cylinder seat 12 with screws, and the sealing ring 6 being fixedly connected to the base housing 3 with screws. The adjusting shim 7 is located between the sealing ring 6 and the cylinder seat 12, and the gap values ​​between the moving friction plate 13, the inner stationary friction plate 16 and the outer stationary friction plate 9, the outer locking plate 8 and the inner locking plate 17 can be controlled by adjusting the height of the adjusting shim 7.

[0050] like Figure 3 As shown, an O-ring seal is provided on the mounting surface between the outer ring 10 of the oil cylinder and the oil cylinder seat 12, and an O-ring seal is provided on the mounting surface between the inner ring 15 of the oil cylinder and the oil cylinder seat 12, which further improves the sealing performance of the outer annular oil cavity and the inner annular oil cavity.

[0051] Both the outer sealing ring 11 and the inner sealing ring 14 are U-shaped sealing rings with U-shaped grooves. Of course, the specific structure of the outer sealing ring 11 and the inner sealing ring 14 is not limited to this; for example, their grooves can also be V-shaped.

[0052] In this embodiment, the cylinder seat 12 is provided with two oil injection holes. One oil injection hole is connected to the groove of the outer sealing ring 11, and the other oil injection hole is connected to the groove of the inner sealing ring 14, so that the oil injection pressure can be controlled separately.

[0053] The clamping mechanism of the CNC rotary table proposed in this embodiment adopts a disc-type locking method. Its compact structure and small axial dimension allow for a flat distribution of parts, making it ideal for functional components such as CNC rotary tables. This clamping mechanism features a simple design, reliable clamping and releasing actions, and a low failure rate. The outer sealing ring 11 and inner sealing ring 14 not only seal the hydraulic oil but also function as "pistons," simplifying the mechanism and enhancing its reliability. The design, consisting of two sets of U-shaped sealing rings (outer sealing ring 11 and inner sealing ring 14) of different sizes, static spring plates (outer static friction plate 9 and inner static friction plate 16), and locking discs (outer locking disc 8 and inner locking disc 17), is equivalent to two cylinders simultaneously acting on the moving friction plate 13, thus achieving a larger locking torque within a limited structural space. The moving friction plate 13, outer static friction plate 9, and inner static friction plate 16, as elastic elements of the clamping mechanism, have simple shapes and structures, directly cut from Grade I heat-treated spring steel strips without the need for secondary heat treatment. By flat grinding the two end faces, the required dimensional accuracy and parallelism can be achieved, thereby simplifying the processing technology and significantly reducing manufacturing costs.

[0054] Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this application is defined by the appended claims rather than the foregoing description, and all variations falling within the meaning and scope of equivalents of the claims are intended to be embraced within this application. No reference numerals in the claims should be construed as limiting the scope of the claims. Furthermore, it is clear that the word "comprising" does not exclude other units or steps, and the singular does not exclude the plural. Multiple units or devices recited in the apparatus claims may also be implemented by the same unit or device in software or hardware. The terms "first," "second," etc., are used to indicate names and do not indicate any particular order.

[0055] The above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit it. Although this application has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this application without departing from the spirit and scope of the technical solutions of this application.

Claims

1. An axial hydraulic clamping mechanism for a CNC rotary table, characterized in that, include: The rotating component includes a rotary table (1), a rotary shaft (4), a connecting plate (5), and a dynamic friction plate (13). The rotary table (1) and the rotary shaft (4) are connected and fixed together by screws. The dynamic friction plate (13) is mounted on the connecting plate (5) and fixed together with the rotary shaft (4) and the rotary table (1) by screws so that it rotates together with the rotary table (1). The fixed components include a base box (3), a cylinder seat (12), an outer cylinder ring (10), an inner cylinder ring (15), an outer sealing ring (11), and an inner sealing ring (14). The cylinder seat (12), the outer cylinder ring (10), and the inner cylinder ring (15) are fixedly installed on the base box (3). The outer cylinder ring (10) and the cylinder seat (12) form an outer annular oil cavity, and the outer sealing ring (11) is installed in the outer annular oil cavity. The inner cylinder ring (15) and the cylinder seat form an inner annular oil cavity, and the inner sealing ring (14) is installed in the inner annular oil cavity. The cylinder seat (12) is provided with an oil injection hole. The outer sealing ring (11) and the inner sealing ring (14) are both provided with slots, and the two slots are respectively connected to the oil injection hole. Turntable bearing (2), the inner ring of the turntable bearing (2) is fixedly connected to the rotary shaft (4), and the outer ring of the turntable bearing (2) is fixedly connected to the base box (3); The locking component includes an outer static friction plate (9), an inner static friction plate (16), an outer locking disc (8), and an inner locking disc (17). The outer static friction plate (9) and the inner static friction plate (16) each have a fixed end and a free end. The fixed end of the outer static friction plate (9) and the outer locking disc (8) are fixedly installed on the outer ring (10) of the hydraulic cylinder. The fixed end of the inner static friction plate (16) and the inner locking disc (17) are fixedly installed on the inner ring (15) of the hydraulic cylinder. The free end of the outer static friction plate (9) covers the upper surface of the outer sealing ring (11) along the side away from the groove, and is located between the upper surface of the outer sealing ring (11) and the lower surface of the dynamic friction plate (13). The outer side of the dynamic friction plate (13) is located between the outer locking disc (8) and the free end of the outer static friction plate (9), so that the free end of the outer static friction plate (9) is deformed by the outer sealing ring (11), so that the outer side of the dynamic friction plate (13) is in close contact with the outer locking disc (8). The free end of the inner static friction plate (16) covers the upper surface of the inner sealing ring (14) along the side away from the groove, and is located between the upper surface of the inner sealing ring (14) and the lower surface of the dynamic friction plate (13). The inner side of the dynamic friction plate (13) is located between the inner locking disc (17) and the free end of the inner static friction plate (16), so that the free end of the inner static friction plate (16) is deformed by the inner sealing ring (14), so that the inner side of the dynamic friction plate (13) is in close contact with the inner locking disc (17).

2. The axial hydraulic clamping mechanism for a CNC rotary table according to claim 1, characterized in that, The dynamic friction plate (13), the inner static friction plate (16), and the outer static friction plate (9) are all elastic elements.

3. The axial hydraulic clamping mechanism for a CNC rotary table according to claim 1, characterized in that, The dynamic friction plate (13), the inner static friction plate (16), and the outer static friction plate (9) are directly cut from Grade I strength heat-treated spring steel strips.

4. The axial hydraulic clamping mechanism for a CNC rotary table according to claim 1, characterized in that, When the clamping mechanism is in an unlocked state, the moving friction plate (13) does not contact the outer locking plate (8) and the inner locking plate (17).

5. An axial hydraulic clamping mechanism for a CNC rotary table according to claim 1, characterized in that, The fixing component also includes a sealing ring (6); the fixed connection between the cylinder seat (12) and the base box (3) is achieved by: the sealing ring (6) and the cylinder seat (12) being fixedly connected by screws, and the sealing ring (6) and the base box (3) being fixedly connected by screws.

6. An axial hydraulic clamping mechanism for a CNC rotary table according to claim 5, characterized in that, The fixing component also includes an adjusting pad (7), which is located between the sealing ring (6) and the cylinder seat (12).

7. An axial hydraulic clamping mechanism for a CNC rotary table according to claim 1, characterized in that, An O-ring is provided on the mounting surface between the outer ring (10) of the oil cylinder and the oil cylinder seat (12).

8. An axial hydraulic clamping mechanism for a CNC rotary table according to claim 1, characterized in that, An O-ring is provided on the mounting surface between the inner ring (15) of the oil cylinder and the oil cylinder seat (12).

9. An axial hydraulic clamping mechanism for a CNC rotary table according to claim 1, characterized in that, Both the outer sealing ring (11) and the inner sealing ring (14) are U-shaped sealing rings, and both of the grooves are U-shaped openings.

10. An axial hydraulic clamping mechanism for a CNC rotary table according to claim 1, characterized in that, The cylinder seat (12) is provided with two oil injection holes, one of which is connected to the groove of the outer sealing ring (11), and the other is connected to the groove of the inner sealing ring (14).

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