Multi-angle positioning pneumatic clamp for ring-shaped jewelry

Abstract

The utility model provides a kind of annular jewelry multi-angle positioning pneumatic clamp, including inner support block, drive part, inner support block includes first inner support block and second inner support block, first inner support block and second inner support block are fixedly connected in the middle part and top of clamping jaw respectively, pneumatic three-jaw chuck is connected by gas source interface into compressed air, compressed air drives the movement of piston inside chuck, drives three clamping jaws synchronous and same displacement and expands outward;Drive part is set in the rear end of mounting seat, is driven by motor, is driven by worm gear structure transmission, and drives pneumatic three-jaw chuck rotation.The utility model, by setting first inner support block and second inner support block are connected in the middle part and top of clamping jaw respectively, and first inner support block is adapted smaller diameter jewelry, such as ring;Second inner support block is adapted larger diameter jewelry, such as bracelet, realizes the accurate adaptation clamping of different specifications annular jewelry, improves the versatility of clamp, and cooperation bolt and washer cooperation facilitate quick replacement.

Description

Technical Field

[0001] This utility model relates to the field of jewelry carving and milling fixture technology, specifically a pneumatic fixture for multi-angle positioning of ring-shaped jewelry. Background Technology

[0002] In the engraving and milling of circular jewelry (such as rings and bracelets), special fixtures are needed to hold the jewelry stably to ensure that it does not shift or shake during the engraving and milling process. Only then can the engraving and milling machine's tools complete the fine processing procedures such as carving patterns on the inner wall, outer wall, and sides, and adjusting the dimensions.

[0003] Currently available clamping machines cannot flexibly adapt to ring jewelry of different diameters. For rings with smaller diameters, excessive clamping force can easily scratch the inner wall; for bracelets with larger diameters, unstable clamping may cause shaking during processing, affecting milling accuracy. This results in insufficient compatibility between the clamping machine and the jewelry. Furthermore, when processing jewelry of different sizes, it is necessary to frequently disassemble and replace clamping components of the corresponding size, which not only prolongs preparation time and reduces processing efficiency, but may also cause the accumulation of positioning errors due to repeated clamping, further affecting the processing quality. Utility Model Content

[0004] The purpose of this utility model is to provide a pneumatic clamp for multi-angle positioning of ring-shaped jewelry, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A pneumatic clamp for multi-angle positioning of ring-shaped jewelry includes:

[0007] The inner support block includes a first inner support block and a second inner support block. The first inner support block and the second inner support block are respectively fixedly connected to the middle and top of the jaws. The jaws are set at the top of the pneumatic three-jaw chuck. The pneumatic three-jaw chuck is connected to compressed air through an air source interface. The compressed air drives the piston inside the chuck to move, which in turn drives the wedge block inside the chuck to move laterally. Through the cooperation between the wedge block and the inclined surface at the bottom of the jaws, the three jaws are driven to expand outward synchronously and with the same displacement, thereby driving the first inner support block and the second inner support block to synchronously tighten the inner wall of the annular jewelry.

[0008] The drive unit is located at the rear end of the mounting base. It is driven by a motor and transmitted through a worm gear structure to rotate the pneumatic three-jaw chuck.

[0009] Preferably, both the first inner support block and the second inner support block have threaded openings on their sides. The fixing bolt passes through the pre-set through hole of the clamping jaw from one threaded opening and is then inserted into the threaded opening on the other side of the inner support block. A first anti-loosening washer is placed between the head of the fixing bolt and the clamping jaw. The end of the fixing bolt passes through the other end of the inner support block and is threadedly connected to the fixing nut. A second anti-loosening washer is placed between the fixing nut and the inner support block, thereby fixing the inner support block to the clamping jaw.

[0010] Preferably, the first inner support block and the second inner support block are adapted to ring-shaped jewelry with different diameters. More preferably, the first inner support block is adapted to ring-shaped jewelry with a smaller diameter, and the second inner support block is adapted to ring-shaped jewelry with a larger diameter.

[0011] Preferably, the lower end face of the pneumatic three-jaw chuck is fixedly connected to the connecting shaft, and the connecting shaft is inserted into the mounting base and connected to the second worm gear in the drive part of the mounting base via a coupling.

[0012] Preferably, a motor is fixedly connected to the side of the mounting base, and the output end of the motor is connected to the first worm gear in the drive unit through a coupling. The first worm gear meshes with the first turbine gear. The first turbine gear is fixedly connected to the left end of the drive shaft, and a second turbine gear is fixedly connected to the right end of the drive shaft. The second turbine gear meshes with the second worm gear.

[0013] Preferably, the drive shaft is fixedly connected to the bottom of the drive unit via a bearing housing.

[0014] Preferably, the lower end face of the mounting base is fixedly connected with a connecting foot for fixing the mounting base inside the engraving and milling machine.

[0015] Preferably, the outer end of the connecting shaft is sealed to the rotating end of the rotary joint, and the fixed end of the rotary joint is equipped with an air source interface for connection to an external air source pipeline.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] This utility model, by setting a first inner support block and a second inner support block connected to the middle and top of the clamping jaws respectively, and the first inner support block is adapted to jewelry with a smaller diameter, such as rings; the second inner support block is adapted to jewelry with a larger diameter, such as bracelets, thus achieving precise fitting and clamping of ring-shaped jewelry of different sizes and improving the versatility of the clamp.

[0018] This utility model, through the setting of a double anti-loosening structure of fixing bolts and fixing nuts in conjunction with the first and second anti-loosening washers, effectively resists processing vibration and cutting force impact, avoids loosening and displacement of the inner support block and the jaws, and ensures the engraving and milling accuracy. At the same time, it ensures that the inner support blocks on the three jaws expand evenly and are subjected to uniform force, preventing processing failure caused by the tilting and shaking of the jewelry.

[0019] This invention utilizes a pneumatic three-jaw chuck, which uses compressed air to drive a piston and wedge block to expand the jaws outward in a synchronous and uniform manner. This achieves rapid and stable internal support clamping of ring-shaped jewelry, ensuring uninterrupted air supply during clamp rotation, avoiding air pipe entanglement, and guaranteeing the reliability of the clamping action.

[0020] This invention utilizes a motor-driven worm gear structure, along with the deceleration and torque-increasing characteristics of multi-stage transmission and a reverse self-locking function, to achieve multi-angle precise rotational positioning of a pneumatic three-jaw chuck. This ensures stable processing of jewelry at preset angles, improving positioning accuracy and rotational stability. Attached Figure Description

[0021] Figure 1 This is a three-dimensional schematic diagram of the overall structure of this utility model;

[0022] Figure 2 This utility model Figure 1 Another perspective 3D illustration;

[0023] Figure 3 This is a three-dimensional schematic diagram of the internal structure of the drive unit of this utility model;

[0024] Figure 4 This is a three-dimensional schematic diagram of the chuck and grippers of this utility model;

[0025] Figure 5 This is a three-dimensional schematic diagram of the gripper of this utility model;

[0026] Figure 6 This is a three-dimensional schematic diagram of the pneumatic three-jaw chuck of this utility model;

[0027] Figure 7 A three-dimensional schematic diagram of the engraving and milling machine housing installed according to this utility model;

[0028] Figure 8 This is a three-dimensional schematic diagram of the installation of the pneumatic clamp and the engraving and milling machine of this utility model.

[0029] In the diagram: 1. Mounting base; 101. Drive unit; 102. Connecting foot; 2. Motor; 3. Pneumatic three-jaw chuck; 301. Clamping jaw; 302. Air source interface; 303. Connecting shaft; 304. Chuck; 4. First worm gear; 5. Second worm gear; 6. First turbine; 7. Second turbine; 8. Drive shaft; 9. Bearing seat; 10. First inner support block; 11. Second inner support block; 12. Fixing bolt; 13. First anti-loosening washer; 14. Second anti-loosening washer; 15. Fixing nut; 16. Engraving and milling machine; 17. Tool changing electric spindle. Detailed Implementation

[0030] 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.

[0031] Example 1:

[0032] Please see Figures 1 to 6 This utility model provides a technical solution:

[0033] A pneumatic clamp for multi-angle positioning of ring-shaped jewelry includes a clamp, the core of which is a pneumatic three-jaw chuck 3, used to achieve internal support clamping of the ring-shaped jewelry.

[0034] The pneumatic three-jaw chuck 3 includes jaws 301 and a chuck 304. Three jaws 301 are evenly distributed around the top of the chuck 304 of the pneumatic three-jaw chuck 3. The jaws 301 are connected to the wedge blocks inside the chuck 304 by inclined surfaces.

[0035] Specifically, such as Figure 6 The pneumatic three-jaw chuck 3 is preferably the KPC803C100 model from the KPC series. As a mature technology in the field of machining, the internal structure of the pneumatic three-jaw chuck 3 has been disclosed in the existing technology. Here is a brief description of its working principle: the outer end of the connecting shaft 303 of the pneumatic three-jaw chuck 3 is sealed to the rotating end of the rotary joint through a sealing ring. The fixed end of the rotary joint is fixed on the mounting base 1 through a bracket, and the fixed end is equipped with an air source interface 302. The air source interface 302 is connected to an external air source pipeline through an air pipe. The rotary joint is equipped with a precision sealing structure and rolling bearings. When the connecting shaft 303 drives the pneumatic three-jaw chuck 3 to rotate, the rotating end of the rotary joint rotates synchronously with the connecting shaft 303, while the fixed end remains stationary, realizing uninterrupted delivery of compressed air. The compressed air enters the internal air passage of the pneumatic three-jaw chuck 3 through the air source interface 302 and the rotary joint, driving the piston in the chuck 304 to move axially, which in turn drives the wedge block to move laterally. Through the cooperation between the wedge block and the inclined surface at the bottom of the jaw 301, the three jaws 301 are driven to expand outward synchronously and with the same displacement. Finally, the first inner support block 10 and the second inner support block 11 are driven to simultaneously tighten the inner wall of the annular jewelry, completing the clamping action. When the air is exhausted, the wedge block under the jaw 301 is reset under the action of the piston, thereby driving the jaw 301 to contract inward and release the jewelry.

[0036] like Figure 5The inner support block includes a first inner support block 10 adapted to smaller diameter ring jewelry (such as rings) and a second inner support block 11 adapted to larger diameter ring jewelry (such as bracelets). The two are respectively installed in the middle and top of the clamp 301 by a fixing connector. The inner support block has a through threaded opening along the axial direction on its side. The fixing bolt 12 passes through a preset through hole on the clamp 301 from one side of the inner support block and is inserted into the threaded opening on the other side of the inner support block. A first anti-loosening washer 13 is placed between the head of the fixing bolt 12 and the clamp 301. The end passes through the other side of the inner support block and is threaded to the fixing nut 15. A second anti-loosening washer 14 is placed between the fixing nut 15 and the inner support block. The double anti-loosening structure ensures the connection strength between the inner support block and the clamp 301 and avoids loosening caused by processing vibration.

[0037] In this embodiment, the fixing bolt 12, fixing nut 15, first anti-loosening washer 13, and second anti-loosening washer 14 work together to form a double anti-loosening structure, which can effectively resist the high-frequency impact caused by equipment vibration and cutting force of the tool during the processing, and prevent the inner support block and the clamping jaw 301 from loosening or displacement. This ensures that the first inner support block 10 and the second inner support block 11 are always firmly fixed in the preset position of the clamping jaw 301, preventing the jewelry from being unstable due to the loosening of the inner support block, thereby avoiding problems such as dimensional errors and pattern distortion caused by jewelry displacement during the processing, and ensuring the carving and milling accuracy. Furthermore, this structure ensures that the inner support blocks on the three grippers 301 maintain a synchronous and balanced state when subjected to force. Since the three grippers 301 need to expand outward synchronously to achieve centering and clamping, the connection stability between the inner support blocks and the grippers 301 directly affects the expansion consistency of each inner support block. This can prevent deviations in the expansion amplitude of a single inner support block due to loose connection, ensuring that the force exerted by the three inner support blocks on the inner wall of the ring-shaped jewelry is evenly distributed, preventing the jewelry from tilting or shaking due to force imbalance, which could lead to jewelry engraving failure and damage.

[0038] like Figure 5 The two sides of the inner support block are finely polished to form a smooth transition corner, which can completely eliminate the potential risk of sharp edges scratching the inner wall of the jewelry and ensure the protection of the inner wall of the jewelry during clamping.

[0039] Specifically, the inner support block is preferably made of a material that combines elasticity and hardness, such as food-grade silicone or polyurethane elastomer. These materials have high surface friction, which can not only fit tightly against the inner wall of the ring-shaped jewelry when clamped to prevent slippage and displacement due to vibration during processing, but also buffer the clamping force with its own moderate elasticity to avoid damage or scratches to the inner wall of the jewelry due to rigid contact.

[0040] Specifically, anti-loosening washers are fastener auxiliary components used to prevent bolts and nuts from loosening due to mechanical vibration. In use, the inner helical toothed surfaces of two washers are placed face-to-face between the nut and the connecting material. When the nut is tightened, its outer radial convex surface engages with the contact surfaces at both ends, and the slope angle of the inner helical toothed surface is greater than the bolt thread angle. When the bolt is stretched due to vibration, causing the nut to loosen, the frictional force of the outer convex surface is greater than the frictional force between the inner helical toothed surfaces, allowing only the inner helical toothed surfaces to move relative to each other and generate lifting tension. When the bolt contracts, the helical toothed surfaces will cause the nut to return to its original position, thus achieving both anti-loosening and tightening effects.

[0041] like Figure 1 The lower end face of the mounting base 1 is welded with a connecting foot 102, which has a through hole. The connecting foot 102 can be engaged with the threaded hole on the worktable of the engraving and milling machine 16 by fastening bolts to securely install the entire fixture inside the engraving and milling machine 16, ensuring that the fixture does not shift or shake during processing. The rear end of the mounting base 1 has an integrally formed drive part 101 mounting cavity for accommodating the worm gear structure.

[0042] like Figure 3 The worm gear structure is housed within the drive unit 101 of the mounting base 1, used to drive the clamping assembly to achieve multi-angle rotational positioning. Its specific structure includes a motor 2, a worm gear, and a connecting shaft 303. The side of the mounting base 1 is fixedly connected to the motor 2 via a flange. The output end of the motor 2 is coaxially connected to the first worm gear 4 via a coupling, ensuring stable power transmission. The first worm gear 4 meshes with the first worm gear 6. The first worm gear 6 is fixedly connected to the left end of the drive shaft 8 via a flat key. The right end of the drive shaft 8 is also fixedly connected to the second worm gear 7 via a flat key. The drive shaft 8 is mounted on the bottom of the drive unit 101 via a bearing seat 9, achieving stable rotation of the drive shaft 8. The second worm gear 7 meshes with the second worm gear 5. The bottom end of the second worm gear 5 is fixedly connected to the connecting shaft 303 via a coupling.

[0043] In this embodiment, after the motor 2 starts, its output torque is transmitted to the first worm 4 through the coupling. The first worm 4 drives the transmission shaft 8 to rotate synchronously with the first turbine 6 through meshing with the first turbine 6. The second turbine 7 at the right end of the transmission shaft 8 rotates with the transmission shaft 8 and transmits power to the second worm 5 through meshing with the second worm 5. The second worm 5 then drives the connecting shaft 303 to rotate through the coupling. Finally, the connecting shaft 303 drives the pneumatic three-jaw chuck 3, which is fixedly connected to it, to achieve multi-angle rotation. Through multi-stage transmission of the worm gear, the torque is amplified by utilizing the reduction characteristics of the worm gear, ensuring that the pneumatic three-jaw chuck 3 has sufficient driving force when rotating the jewelry. Even when facing clamping loads of jewelry of different sizes, it can still maintain rotational stability. In addition, the worm gear transmission has a reverse self-locking characteristic, which can prevent the pneumatic three-jaw chuck 3 from rotating unexpectedly due to external forces or vibrations during processing, ensuring the precise positioning of the jewelry at the preset angle. With the stable support of connecting parts such as the flat key and bearing seat 9, the positioning accuracy of processing is improved, enabling the jewelry to achieve precise multi-angle rotation according to the program, meeting the needs of multi-angle processing of complex engraving patterns.

[0044] Example 2:

[0045] Please see Figures 7 to 8 This utility model provides a technical solution that is basically the same as that in Embodiment 1, with slight differences:

[0046] The multi-angle positioning fixture of Example 1 can be installed on, for example, Figure 7 , Figure 8 The engraving and milling machine 16 is inside.

[0047] The engraving and milling machine 16 is a four-axis engraving and milling machine 16, that is, a processing device with three linear motion axes (X-axis, Y-axis, and Z-axis) and one rotary axis (A-axis), which can realize the coordinated control of linear movement and multi-angle rotation processing of the workpiece in three-dimensional space. Among them, the tool-changing electric spindle 17 of the engraving and milling machine 16 is the core processing component, responsible for realizing the three-axis drive movement of X-axis (lateral), Y-axis (longitudinal), and Z-axis (vertical). By precisely controlling the displacement of the tool on these three linear axes, basic processing actions such as cutting and engraving are completed. The multi-angle positioning fixture of Embodiment 1 realizes the rotational movement through the worm gear structure of the drive unit 101, which serves as the fourth axis (A-axis) and can drive the ring jewelry to rotate in multiple angles within a range of 360°.

[0048] The three-axis drive of the tool-changing electric spindle 17 forms a four-axis linkage with the rotation axis of the fixture. The tool-changing electric spindle 17 drives the tool to move precisely in the X, Y, and Z axes, and processes the jewelry that has been rotated to a specific angle on the fixture. The multi-angle engraving and milling process of the ring jewelry can be completed without multiple clamping.

[0049] In use, first select the corresponding inner support block according to the specifications of the ring-shaped jewelry, and ensure that it is securely connected to the jaws 301 by the fixing bolts 12, fixing nuts 15 and double anti-loosening washers. After the jewelry is put into the inner support block, compressed air is introduced through the air source interface 302 to drive the jaws 301 of the pneumatic three-jaw chuck 3 to expand synchronously, so that the inner support block tightens the jewelry from the inside to complete the clamping. Start the engraving and milling machine 16 for processing. The motor 2 drives the fixture to rotate through the worm gear, and performs multi-angle engraving and milling in conjunction with the tool changing electric spindle 17. After the processing is completed, stop the air supply, the jaws 301 retract and release the jewelry, and it can be removed.

[0050] All other parts of this utility model not described herein are the same as existing technologies, or are known technologies, or can be implemented using existing technologies, and will not be described in detail here.

[0051] 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 clamp for multi-angle positioning of ring-shaped jewelry, characterized in that, include: The inner support block includes a first inner support block (10) and a second inner support block (11). The first inner support block (10) and the second inner support block (11) are respectively fixedly connected to the middle and top of the jaw (301). The jaw (301) is set at the top of the chuck (304) of the pneumatic three-jaw chuck (3). The pneumatic three-jaw chuck (3) is connected to compressed air through the air source interface (302). The compressed air drives the piston inside the chuck (304) to move, thereby driving the wedge block inside the chuck (304) to move laterally. Through the cooperation between the wedge block and the bottom inclined surface of the jaw (301), the three jaws (301) are driven to expand outward synchronously and with the same displacement, thereby driving the first inner support block (10) and the second inner support block (11) to synchronously tighten the inner wall of the annular jewelry. The drive unit (101) is located at the rear end of the mounting base (1). It is driven by a motor (2) and transmitted through a worm gear structure to drive the pneumatic three-jaw chuck (3) to rotate.

2. The pneumatic clamp for multi-angle positioning of ring-shaped jewelry according to claim 1, characterized in that: The first inner support block (10) and the second inner support block (11) are both provided with threaded openings on their sides. The fixing bolt (12) passes through the pre-set through hole of the clamp (301) from one side threaded opening and is then inserted into the threaded opening on the other side of the inner support block. A first anti-loosening washer (13) is placed between the head of the fixing bolt (12) and the clamp (301). The end of the fixing bolt (12) passes through the other end of the inner support block and is threadedly connected to the fixing nut (15). A second anti-loosening washer (14) is placed between the fixing nut (15) and the inner support block to fix the inner support block on the clamp (301).

3. The pneumatic clamp for multi-angle positioning of ring-shaped jewelry according to claim 2, characterized in that: The first inner support block (10) and the second inner support block (11) are respectively adapted to ring-shaped jewelry with different diameters.

4. The pneumatic clamp for multi-angle positioning of ring-shaped jewelry according to claim 1, characterized in that: The lower end face of the chuck (304) of the pneumatic three-jaw chuck (3) is fixedly connected to the connecting shaft (303). The connecting shaft (303) is inserted into the mounting base (1) and connected to the second worm gear (5) in the drive part (101) of the mounting base (1) via a coupling.

5. A pneumatic clamp for multi-angle positioning of ring-shaped jewelry according to claim 4, characterized in that: A motor (2) is fixedly connected to the side of the mounting base (1). The output end of the motor (2) is connected to the first worm (4) in the drive unit (101) through a coupling. The first worm (4) meshes with the first turbine (6). The first turbine (6) is fixedly connected to the left end of the transmission shaft (8). The right end of the transmission shaft (8) is fixedly connected to the second turbine (7). The second turbine (7) meshes with the second worm (5).

6. A pneumatic clamp for multi-angle positioning of ring-shaped jewelry according to claim 5, characterized in that: The drive shaft (8) is fixedly connected to the bottom of the drive unit (101) via a bearing seat (9).

7. A pneumatic clamp for multi-angle positioning of ring-shaped jewelry according to claim 4, characterized in that: The lower end face of the mounting base (1) is fixedly connected with a connecting foot (102) for fixing the mounting base (1) inside the engraving and milling machine (16).

8. A pneumatic clamp for multi-angle positioning of ring-shaped jewelry according to claim 4, characterized in that: The outer end of the connecting shaft (303) is sealed to the rotating end of the rotary joint, and the fixed end of the rotary joint is equipped with an air source interface (302) and connected to an external air source pipeline.

Images