Oil-free hydraulic force-multiplying rotary chuck

Abstract

The utility model discloses an empty oil pressure force multiplication output rotary chuck, including the chassis, through setting 15 degree taper in the thrust ring inner wall, setting 45 degree angle structure and the 22.5 degree taper conversion structure of annular groove setting in the slide sleeve inner wall top in the slide sleeve, constructs 15 degree self -locking angle + 45 degree thrust angle's force multiplication transmission system, under the same empty oil pressure pressure (such as 20kg / cm 2 )、Same oil cylinder area (thrust side piston area 117.75cm 2 ) is compared with traditional chuck, and the output clamping force promotes three times, and the design can realize high -strength clamping without increasing the oil cylinder size, can stably hold the heavy load workpiece (such as the shaft class spare of weight more than 50kg) of phi 68mm, and after clamping, realizes mechanical self -locking through 15 degree self -locking angle, even if empty oil pressure system pressure fluctuation or shutdown, still can keep stable clamping force, avoid workpiece loosening, guarantee the safety of heavy load processing, and also take into account the compact volume of chuck, adapts various specifications machine tool.

Description

Technical Field

[0001] This utility model relates to the field of mechanical processing equipment technology, specifically to a pneumatic-hydraulic force-multiplying rotary chuck. Background Technology

[0002] In the field of machining, rotary chucks, as core components for workpiece clamping and rotary drive, are widely used in lathes, milling machines, and other equipment. However, in practical applications, traditional rotary chucks and conventional pneumatic-hydraulic driven chucks rely solely on a single calculation logic of pressure × piston area, without a force amplification structure. This results in limited output clamping force under the same pneumatic-hydraulic pressure and cylinder specifications. When machining heavy-duty workpieces (such as large-diameter shaft parts) or cutting scenarios requiring high-strength clamping, traditional chucks are prone to workpiece slippage and displacement due to insufficient clamping force. This not only affects machining accuracy (such as excessive deviations in cylindricity and coaxiality) but may also pose a safety hazard of workpiece detachment. Furthermore, conventional pneumatic-hydraulic chucks often employ a "rear-mounted cylinder + tie rod drive" structure. The design requires the cylinder to be independently installed at the rear of the machine tool and then connected to the internal components of the chuck via a long drawbar to transmit power. This structure has two major drawbacks: First, the long-distance transmission of the drawbar is prone to elastic deformation, resulting in power transmission loss and further weakening the clamping force. At the same time, the deformation will damage the coaxiality of the chuck and reduce the rotation accuracy. Second, the installation of the rear-mounted cylinder and drawbar requires additional machine tool space and has extremely high requirements for the accuracy of the installation position. This not only increases the assembly difficulty and time, but also makes it difficult to adapt to compact integrated machine tools, limiting the application scenarios of the chuck. Therefore, we need to propose a pneumatic-hydraulic force-multiplying rotary chuck. Utility Model Content

[0003] The purpose of this invention is to provide a pneumatic-hydraulic force-multiplying rotary chuck, which has the advantages of easy installation on machine tools, no need for a rear-mounted cylinder and tie rod, compact structure, and strong clamping force, so as to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: Pneumatic / hydraulic pressure multiplier rotary chuck, including: The chassis has several sets of steel ball grooves arranged in a ring on the top outer wall, and each set of steel ball grooves is filled with steel balls. The sliding sleeve is installed inside the top of the chassis, and its outer wall is in contact with one side of several sets of steel balls; A convex retaining ring is installed inside the bottom of the chassis and is fixed to the bottom of the sliding sleeve by four sets of symmetrically arranged bolts; A spring collet, installed inside the sliding sleeve, with a base extending from the top, is used to clamp the workpiece; A threaded cap, threadedly installed on the outer wall of the top of the chassis, is used to limit the movement of the spring collet; The positioning rod is fixedly installed on the side wall of the convex fixing ring, and its top is slidably inserted into the inside of the chassis for docking and positioning between the convex fixing ring and the chassis. The first spring, arranged in a ring array of several groups, is mounted on the chassis. Its bottom is in contact with the top of the outer ring of the convex fixing ring, and is used to provide a downward pulling force to the convex fixing ring, so that the sliding sleeve slides down and separates from the spring collet. The push assembly, mounted on the outer wall of the chassis, is used to connect oil or gas to the push spring collet to clamp or release the workpiece.

[0005] Preferably, the pushing assembly includes a thrust ring, which is sleeved on the outer wall of the top of the chassis. The inner wall of the thrust ring is in contact with one side of several sets of steel balls, and the top is in contact with the bottom of the threaded cap. A piston is sleeved on the bottom outer wall, and an upper thrust bearing is installed inside the piston. The inner wall of the upper thrust bearing is in contact with the outer wall of the thrust ring. A lower thrust bearing is sleeved on the bottom outer wall of the chassis, and a lower cylinder is installed on the chassis outside the lower thrust bearing. An upper cylinder is installed on the top of the lower cylinder by several sets of fixed bolts arranged in a ring array. The inner wall of the top of the upper cylinder is in contact with the outer wall of the piston.

[0006] Preferably, a lower inlet pipe is fixedly connected to one side of the lower cylinder body, and an upper inlet pipe is fixedly connected to one side of the upper cylinder body, with the upper inlet pipe and the lower inlet pipe being arranged vertically in correspondence.

[0007] Preferably, the bottom of the chassis has several sets of stepped through holes arranged in a circular array. Each set of stepped through holes has a limit rod installed inside, and the outer wall of the limit rod is fitted with a second spring. The top of the limit rod passes through the stepped through hole and is slidably inserted into the inside of the bottom wall of the thrust ring, while the bottom is fixed in the stepped through hole by bolts.

[0008] Preferably, the chassis has several sets of mounting slots, several sets of first springs are respectively installed inside the several sets of mounting slots, and the chassis has a through hole corresponding to the positioning rod in the middle of two sets of mounting slots, and the top of the positioning rod is slidably inserted into the through hole.

[0009] Preferably, a dustproof ring is fixedly installed on the top of the piston by a series of annular bolts. The top of the inner wall of the dustproof ring is in contact with the top of the outer wall of the thrust ring, and the bottom of the outer wall is in contact with the top inner wall of the upper cylinder.

[0010] Preferably, the outer wall of the sliding sleeve is provided with an annular groove, and one side of each of the several sets of steel balls is located inside the annular groove.

[0011] Preferably, the inner wall of the thrust ring has a 15° taper, the annular groove of the sliding sleeve has a 45° angle structure, and the top inner wall of the sliding sleeve has a 22.5° taper conversion structure. The 15° taper of the inner wall of the thrust ring and the 45° angle structure on the annular groove cooperate to form a combination structure of 15° self-locking angle and 45° thrust angle.

[0012] Preferably, the top outer wall of the chassis is provided with an external thread that matches the internal thread of the threaded cover, and the internal thread of the threaded cover is threadedly connected to the external thread.

[0013] Compared with the prior art, the beneficial effects of this utility model are: 1. This utility model constructs a force-multiplying transmission system with a 15° self-locking angle and a 45° thrust angle by setting a 15° taper on the inner wall of the thrust ring, a 45° angle structure in the annular groove on the sliding sleeve, and a 22.5° taper conversion structure at the top of the inner wall of the sliding sleeve. This system operates under the same pneumatic / hydraulic pressure (e.g., 20 kg / cm²). 2 The same cylinder area (thrust-side piston area 117.75cm²) 2 Under these conditions, the output clamping force is three times higher than that of traditional chucks. This design can achieve high-strength clamping without increasing the size of the hydraulic cylinder. It can stably clamp heavy-duty workpieces with a diameter of φ68mm (such as shaft parts weighing more than 50kg). After clamping, it achieves mechanical self-locking through a 15° self-locking angle. Even if the pressure of the pneumatic hydraulic system fluctuates or the machine stops, it can still maintain a stable clamping force and prevent the workpiece from loosening. It not only ensures the safety of heavy-duty processing, but also takes into account the compact size of the chuck, making it suitable for various machine tools. 2. This utility model abandons the traditional rear-mounted cylinder + tie rod design, integrating the lower cylinder body, upper cylinder body, piston, chassis, sliding sleeve and thrust ring into one unit. It can be directly fixed to the machine tool with only external hexagonal screws. On the one hand, it eliminates the long-distance transmission of the tie rod, avoids power transmission loss, and improves the efficiency of clamping force transmission. On the other hand, the integrated structure does not require additional space at the rear of the machine tool, improving installation efficiency. It is also compatible with most small and medium-sized lathes and milling machines, significantly improving the installation adaptability of the chuck and the equipment integration efficiency. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a cross-sectional planar structural diagram of the present invention; Figure 3 This is a schematic diagram of the exploded structure of this utility model; Figure 4 This is a side view of the bottom structure of the present invention; Figure 5 This is a schematic diagram of the structure of the chassis, sliding sleeve, and spring collet of this utility model; Figure 6 This is a schematic diagram of the chassis and limiting rod of this utility model; Figure 7 This is a schematic diagram of the structure of the fixing ring, the limiting rod, and the chassis of this utility model; Figure 8 This is a schematic diagram of the structure of the lower cylinder and the upper cylinder of this utility model.

[0015] In the diagram: 1. Chassis; 101. Ball groove; 102. Ball; 103. External thread; 104. Stepped through hole; 105. Mounting groove; 106. Through hole; 2. Lower cylinder body; 201. Lower inlet pipe; 3. Upper cylinder body; 301. Upper inlet pipe; 4. Piston; 5. Sliding sleeve; 501. Annular groove; 6. Thrust ring; 7. Retaining ring; 8. Dustproof ring; 9. Threaded cap; 10. Positioning rod; 11. Lower thrust bearing; 12. Spring collet; 13. First spring; 14. Second spring; 15. Limiting rod; 16. Upper thrust bearing. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] Please see Figure 1-8 This utility model provides a technical solution: A pneumatic-hydraulic force-multiplying rotary chuck includes: a chassis 1, with several sets of ball bearing grooves 101 arranged in a ring on the top outer wall, each set of grooves 101 containing a ball bearing 102; a sliding sleeve 5, installed inside the top of the chassis 1, with its outer wall fitting against one side of the sets of ball bearings 102; a convex retaining ring 7, installed inside the bottom of the chassis 1, and fixed to the bottom of the sliding sleeve 5 by four sets of symmetrically arranged bolts; a spring collet 12, installed inside the sliding sleeve 5, extending out of the chassis 1 at the top for clamping workpieces; and a threaded cap 9, threaded onto the top of the chassis 1. The wall is used to limit the spring collet 12; the positioning rod 10 is fixedly installed on the side wall of the convex fixing ring 7, and its top is slidably inserted into the inside of the chassis 1 for docking and positioning between the convex fixing ring 7 and the chassis 1; the first spring 13 is arranged in a ring array of several groups and installed on the chassis 1, with its bottom in contact with the top of the outer ring of the convex fixing ring 7, for providing a downward pulling force to the convex fixing ring 7, so that the sliding sleeve 5 slides down and separates from the spring collet 12; the pushing assembly is installed on the outer wall of the chassis 1 for connecting oil and gas to push the spring collet 12 to clamp or release the workpiece.

[0018] It should be noted that by using four sets of symmetrical bolts to fix the convex fixing ring 7 and the sliding sleeve 5, the stability and coaxiality of the connection between the two are ensured, thereby preventing the sliding sleeve 5 from shifting during movement and ensuring clamping accuracy. By setting the positioning rod 10, the convex fixing ring 7 and the chassis 1 are docked and positioned, avoiding misalignment of the convex fixing ring 7 during installation, thereby simplifying the installation process and improving assembly efficiency. By arranging the first spring 13 in a ring array to apply a uniform downward pulling force to the convex fixing ring 7, the smoothness of the sliding sleeve 5's downward movement is ensured, thereby enabling the sliding sleeve 5 to reliably separate from the spring collet 12 and ensuring the smooth release of the workpiece.

[0019] In an optional embodiment: the pushing assembly includes a thrust ring 6, which is sleeved on the outer wall of the top of the chassis 1. The inner wall of the thrust ring 6 is in contact with one side of a plurality of sets of steel balls 102, and the top is in contact with the bottom of the threaded cap 9. A piston 4 is sleeved on the bottom outer wall, and an upper thrust bearing 16 is installed inside the piston 4. The inner side wall of the upper thrust bearing 16 is in contact with the outer wall of the thrust ring 6. A lower thrust bearing 11 is sleeved on the bottom outer wall of the chassis 1, and a lower cylinder 2 is installed on the chassis 1 outside the lower thrust bearing 11. An upper cylinder 3 is installed on the top of the lower cylinder 2 by a plurality of sets of annular array fixing bolts. The inner wall of the top of the upper cylinder 3 is in contact with the outer wall of the piston 4.

[0020] It should be noted that by making the inner wall of the thrust ring 6 fit against the steel ball 102, the rolling characteristics of the steel ball 102 are used to transmit thrust, reducing the frictional resistance between the thrust ring 6 and the chassis 1, thus achieving smoother movement of the thrust ring 6 and reducing power loss. By installing a thrust bearing 16 inside the piston 4 and fitting it against the outer wall of the thrust ring 6, the linear motion of the piston 4 is smoothly converted into the motion of the thrust ring 6, avoiding wear caused by direct contact between the two, thus extending the service life of the components and ensuring the stability of thrust transmission. By setting a lower thrust bearing 11 at the bottom of the chassis 1, support is provided for the rotational motion of the chassis 1, reducing friction during chassis 1 rotation, thus ensuring the overall rotational accuracy of the chuck and improving the stability of high-speed operation. By connecting the lower cylinder 2 and the upper cylinder 3 with several sets of annular array fixing bolts, the sealing and structural stability of the cylinder connection are ensured, thus preventing oil and gas leakage and ensuring the reliability of the chuck drive.

[0021] In an optional embodiment: a lower inlet pipe 201 is fixedly connected to one side of the lower cylinder 2, and an upper inlet pipe 301 is fixedly connected to one side of the upper cylinder 3, with the upper inlet pipe 301 and the lower inlet pipe 201 being arranged vertically in correspondence.

[0022] It should be noted that by setting the lower inlet pipe 201 and the upper inlet pipe 301 on the lower cylinder 2 and the upper cylinder 3 respectively, oil or gas can be input separately, providing an independent drive channel for the clamping and releasing action of the chuck, achieving the effect of precise control of the chuck action switching and improving the operational flexibility; by setting the upper inlet pipe 301 and the lower inlet pipe 201 correspondingly, it is convenient to arrange the external pipelines symmetrically, reduce the interference between pipelines, and achieve the effect of simplifying pipeline installation and improving the overall neatness of the equipment layout.

[0023] In an optional embodiment: the bottom of the chassis 1 has a plurality of stepped through holes 104 arranged in a ring array. Each of the plurality of stepped through holes 104 is equipped with a limit rod 15, and the outer wall of the limit rod 15 is fitted with a second spring 14. The top of the limit rod 15 passes through the stepped through hole 104 and is slidably inserted into the bottom wall of the thrust ring 6, and the bottom is fixed in the stepped through hole 104 by bolts.

[0024] It should be noted that by setting a stepped through hole 104 in a ring array at the bottom of the chassis 1 and installing a limiting rod 15, the maximum upward stroke of the thrust ring 6 is limited, avoiding damage to the components due to excessive movement of the thrust ring 6, thus achieving the effect of protecting the internal structure of the chuck and improving the safety of equipment operation. By sleeved a second spring 14 on the outer wall of the limiting rod 15, an auxiliary restoring force can be provided when the thrust ring 6 descends, ensuring that the thrust ring 6 returns to its original position quickly and smoothly, thus shortening the response time of the chuck action and improving work efficiency. By fixing the bottom of the limiting rod 15 in the stepped through hole 104 with bolts, it is easy to disassemble and maintain the limiting rod 15, thus reducing the difficulty of equipment maintenance and reducing maintenance costs.

[0025] In an optional embodiment: a plurality of mounting slots 105 are provided on the chassis 1, and a plurality of first springs 13 are respectively installed inside the plurality of mounting slots 105. The chassis 1 is provided with a through hole 106 corresponding to the positioning rod 10 in the middle of two of the mounting slots 105, and the top of the positioning rod 10 is slidably inserted into the through hole 106.

[0026] It should be noted that by opening the mounting groove 105 on the chassis 1 to place the first spring 13, the first spring 13 is positioned and constrained, preventing the first spring 13 from shifting or falling off during operation, thus ensuring the stable function of the first spring 13 and improving the reliability of the chuck's operation. By opening the through hole 106 between the two sets of mounting grooves 105 to match the positioning rod 10, the positioning rod 10 is provided with precise motion guidance, ensuring smooth sliding of the positioning rod 10, and further improving the docking and positioning accuracy between the convex fixing ring 7 and the chassis 1, and ensuring the overall assembly accuracy of the chuck.

[0027] In an optional embodiment: a dustproof ring 8 is fixedly installed on the top of the piston 4 by a series of annular array bolts, the top of the inner wall of the dustproof ring 8 is in contact with the top of the outer wall of the thrust ring 6, and the bottom of the outer wall is in contact with the top inner wall of the upper cylinder 3.

[0028] It should be noted that by setting a dustproof ring 8 on the top of the piston 4 and making its inner wall fit against the outer wall of the thrust ring 6 and the outer wall fit against the inner wall of the upper cylinder 3, a closed dustproof structure is formed, which can effectively block external dust and impurities from entering the inside of the chuck, thereby protecting the internal precision components and extending the service life of the chuck. The dustproof ring 8 is fixed by several sets of annular array bolts, which ensures that the dustproof ring 8 is firmly installed and avoids loosening or displacement during the movement of the chuck, thereby ensuring stable dustproof effect and improving the reliability of equipment operation.

[0029] In an optional embodiment: the outer wall of the sliding sleeve 5 is provided with an annular groove 501, and one side of several sets of steel balls 102 is located inside the annular groove 501.

[0030] It should be noted that by setting an annular groove 501 on the outer wall of the sliding sleeve 5 and placing the steel ball 102 in the groove, the steel ball 102 is axially limited, preventing it from falling off axially during movement. This ensures the stability of the steel ball 102's function and improves the stability of the chuck structure. At the same time, the structural design of the annular groove 501 further optimizes the contact method between the steel ball 102 and the sliding sleeve 5, making the force more uniform and reducing local wear, thus extending the service life of the sliding sleeve 5 and the steel ball 102.

[0031] In an optional embodiment: the inner wall of the thrust ring 6 is provided with a 15° taper, the annular groove 501 of the sliding sleeve 5 is provided with a 45° angle structure, and the top inner wall of the sliding sleeve 5 is provided with a 22.5° taper conversion structure. The 15° taper of the inner wall of the thrust ring 6 and the 45° angle structure on the annular groove 501 cooperate to form a combination structure of a 15° self-locking angle and a 45° thrust angle.

[0032] It should be noted that by setting a 15° taper on the inner wall of the thrust ring 6, and setting a 45° angle structure and a 22.5° taper conversion structure in the annular groove 501 of the sliding sleeve 5, a force-multiplying transmission system is constructed. Under the same oil and gas pressure and cylinder area, the output force can be increased by 3 times, which achieves the effect of enhancing the clamping force of the chuck and meeting the processing requirements of heavy-duty workpieces. At the same time, the 15° self-locking angle design can achieve reliable self-locking after clamping, avoiding the decrease in clamping force due to pressure fluctuations, thus ensuring the clamping stability and improving the processing accuracy during workpiece processing.

[0033] In an optional embodiment: the top outer wall of the chassis 1 is provided with an external thread 103 that is adapted to the internal thread of the threaded cover 9, and the internal thread of the threaded cover 9 is threadedly connected to the external thread 103.

[0034] It should be noted that by setting an external thread 103 on the top of the chassis 1 and engaging with the internal thread of the threaded cover 9, the threaded cover 9 can be detached and installed, which facilitates the disassembly and maintenance of the internal components of the chuck, thereby reducing the difficulty of equipment maintenance and improving the convenience of maintenance. At the same time, the threaded connection ensures the sealing and firmness of the connection between the threaded cover 9 and the chassis 1, preventing external impurities from entering or internal components from loosening, thus protecting the internal structure of the chuck and improving the reliability of equipment operation.

[0035] Working principle: When workpiece clamping is required, oil and gas enter the lower cylinder 2 through the lower inlet pipe 201. The oil and gas pressure pushes the piston 4 upward. When the piston 4 moves upward, it drives the internal upper thrust bearing 16 upward synchronously. The upper thrust bearing 16 drives the thrust ring 6 upward. During the upward movement of the thrust ring 6, the 15° taper of its inner wall generates an inward squeezing force on the steel ball 102, causing the steel ball 102 to roll inward along the steel ball groove 101 of the chassis 1. When the steel ball 102 moves inward, it exerts an inward pressure on the annular groove 50 of the sliding sleeve 5. The 45° angle structure at point 1 applies an upward thrust, pushing the sliding sleeve 5 upward. When the sliding sleeve 5 moves upward, the 22.5° taper conversion structure on the inner wall of the top of the sliding sleeve 5 converts the axial movement into a radial contraction force, driving the spring collet 12 to contract radially, thereby clamping the workpiece. During this process, the 15° taper of the inner wall of the thrust ring 6 and the 45° angle structure on the annular groove 501 combine to form a 15° self-locking angle and a 45° thrust angle, achieving a 3 times force output. At the same time, the limiting rod 15 limits the maximum stroke of the thrust ring 6 to prevent component overload.

[0036] When it is necessary to release the workpiece, oil and gas enter the upper cylinder 3 through the upper inlet pipe 301 on the upper cylinder 3. The oil and gas pressure pushes the piston 4 downward. After the piston 4 moves downward, it separates from the upper thrust bearing 16. At this time, the first spring 13 generates a downward pulling force on the convex fixed ring 7. The convex fixed ring 7 drives the sliding sleeve 5 to move downward. At the same time, the second spring 14 assists the thrust ring 6 to reset downward. When the sliding sleeve 5 moves downward, the tapered fit between it and the spring collet 12 is released. The spring collet 12 returns to its original shape under its own elastic force, thus releasing the workpiece.

[0037] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A pneumatic / hydraulic pressure multiplier rotary chuck, characterized in that, include: The chassis (1) has several sets of steel ball grooves (101) arranged in a ring on the top outer wall, and steel balls (102) are installed inside the several sets of steel ball grooves (101). The sliding sleeve (5) is installed inside the top of the chassis (1), and its outer wall is attached to one side of several sets of steel balls (102); A convex fixing ring (7) is installed inside the bottom of the chassis (1) and fixed to the bottom of the sliding sleeve (5) by four sets of symmetrically arranged bolts; Spring collet (12) is installed inside the sliding sleeve (5) and extends from the top of the base plate (1) for clamping the workpiece; A threaded cap (9) is threaded onto the outer wall of the top of the chassis (1) and is used to limit the spring collet (12); The positioning rod (10) is fixedly installed on the side wall of the convex fixing ring (7), and its top is slidably inserted into the inside of the chassis (1) for docking and positioning between the convex fixing ring (7) and the chassis (1); The first spring (13) is arranged in a ring array of several groups and installed on the chassis (1). Its bottom is in contact with the top of the outer ring of the convex fixing ring (7) to provide a downward pulling force to the convex fixing ring (7) so that the sliding sleeve (5) slides down and separates from the spring collet (12). The push assembly is installed on the outer wall of the chassis (1) and is used to connect oil and gas to the push spring collet (12) to clamp or release the workpiece.

2. The pneumatic-hydraulic force-multiplying rotary chuck according to claim 1, characterized in that: The pushing assembly includes a thrust ring (6), which is sleeved on the outer wall of the top of the chassis (1). The inner wall is in contact with one side of several sets of steel balls (102), and the top is in contact with the bottom of the threaded cover (9). A piston (4) is sleeved on the bottom outer wall, and an upper thrust bearing (16) is installed inside the piston (4). The inner side wall of the upper thrust bearing (16) is in contact with the outer wall of the thrust ring (6). A lower thrust bearing (11) is sleeved on the bottom outer wall of the chassis (1), and a lower cylinder (2) is installed on the chassis (1) outside the lower thrust bearing (11). An upper cylinder (3) is installed on the top of the lower cylinder (2) by a number of fixed bolts arranged in a ring array. The inner wall of the top of the upper cylinder (3) is in contact with the outer wall of the piston (4).

3. The pneumatic-hydraulic force-multiplying rotary chuck according to claim 2, characterized in that: The lower cylinder (2) is fixedly connected to a lower inlet pipe (201) on one side, and the upper cylinder (3) is fixedly connected to an upper inlet pipe (301) on one side, with the upper inlet pipe (301) and the lower inlet pipe (201) being arranged vertically in correspondence.

4. The pneumatic-hydraulic force-multiplying rotary chuck according to claim 1, characterized in that: The bottom of the chassis (1) has several sets of stepped through holes (104) arranged in a ring array. Each set of stepped through holes (104) is equipped with a limit rod (15), and the outer wall of the limit rod (15) is fitted with a second spring (14). The top of the limit rod (15) passes through the stepped through hole (104) and slides into the bottom wall of the thrust ring (6), and the bottom is fixed in the stepped through hole (104) by bolts.

5. The pneumatic-hydraulic force-multiplying rotary chuck according to claim 1, characterized in that: The chassis (1) is provided with several sets of mounting slots (105), and several sets of first springs (13) are respectively installed inside the several sets of mounting slots (105). The chassis (1) is provided with a through hole (106) corresponding to the positioning rod (10) in the middle of two sets of mounting slots (105). The top of the positioning rod (10) is slidably inserted into the through hole (106).

6. The pneumatic-hydraulic force-multiplying rotary chuck according to claim 2, characterized in that: The top of the piston (4) is fixedly installed with a dustproof ring (8) by a series of bolts in a ring array. The top of the inner wall of the dustproof ring (8) is in contact with the top of the outer wall of the thrust ring (6), and the bottom of the outer wall is in contact with the top inner wall of the upper cylinder (3).

7. The pneumatic-hydraulic force-multiplying rotary chuck according to claim 2, characterized in that: The outer wall of the sliding sleeve (5) is provided with an annular groove (501), and one side of several sets of steel balls (102) is located inside the annular groove (501).

8. The pneumatic-hydraulic force-multiplying rotary chuck according to claim 7, characterized in that: The inner wall of the thrust ring (6) is provided with a 15° taper, the annular groove (501) of the sliding sleeve (5) is provided with a 45° angle structure, and the top inner wall of the sliding sleeve (5) is provided with a 22.5° taper conversion structure. The 15° taper of the inner wall of the thrust ring (6) and the 45° angle structure on the annular groove (501) cooperate to form a combination structure of 15° self-locking angle and 45° thrust angle.

9. The pneumatic-hydraulic force-multiplying rotary chuck according to claim 1, characterized in that: The top outer wall of the chassis (1) is provided with an external thread (103) that is compatible with the internal thread of the threaded cover (9), and the internal thread of the threaded cover (9) is threadedly connected to the external thread (103).

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