Self-centering chuck device

Abstract

The utility model relates to the technical field of self-centering chuck, specifically disclose a self-centering chuck device, including support platform, the upside of support platform is provided with conversion formula clamping mechanism, is used for carrying out self-centering clamping to cylindrical workpiece and square workpiece, conversion formula clamping mechanism includes the central column fixedly connected in support platform upper end, the upper end fixedly connected with fixed disc of central column, four circumferential uniform distribution's guide groove are passed through and are set up on the fixed disc, the inside of each guide groove is slidably connected with sliding sleeve through two sliding grooves and two sliding blocks, according to the workpiece shape selection corresponding first card seat or second card seat is towards the center, after the fixed conversion sleeve by locking mechanism, four moving columns are synchronously driven by adjusting mechanism radial movement, drive the selected first card seat or second card seat common approach or far from the center, thereby realize single device to the stable self-centering clamping of circular and square workpiece, improved the flexibility of use and application range.

Description

Technical Field

[0001] This utility model relates to the field of self-centering chuck technology, and specifically discloses a self-centering chuck device. Background Technology

[0002] A self-centering chuck is a basic fixture in machining. Its core function is to automatically align the clamping center of multiple jaws with the geometric center of the workpiece through the synchronous movement of the mechanism. Traditional self-centering chucks typically use a screw or lever structure to drive multiple jaws to move synchronously radially, thereby uniformly clamping the workpiece from its outer wall and achieving centering.

[0003] However, most existing self-centering chucks have relatively simple functions, and their jaw structure is usually fixed. A set of jaws is only for a specific type of workpiece shape. For example, the common three-jaw chuck is good at clamping cylindrical workpieces, but it is difficult to achieve stable and reliable centering clamping for square cross-section workpieces, resulting in poor flexibility of use.

[0004] Therefore, a self-centering chuck device is needed to solve the above problems. Utility Model Content

[0005] This invention proposes a self-centering chuck device that can adapt to and stably clamp round or square workpieces through structural transformation, effectively improving the flexibility of the device.

[0006] This utility model is implemented as follows: a self-centering chuck device includes a support platform, and a conversion clamping mechanism is provided on the upper side of the support platform for self-centering clamping of cylindrical workpieces and square workpieces. The convertible clamping mechanism includes a central column fixedly connected to the upper end of a support platform. A fixed plate is fixedly connected to the upper end of the central column. Four guide grooves are evenly distributed circumferentially through the fixed plate. A sliding sleeve is slidably connected inside each guide groove through two sliding grooves and two sliders. A movable column is fixedly connected inside the sliding sleeve. A convertible sleeve is rotatably connected to the outer wall of the movable column through two bearings. A first clamping seat is fixedly connected to the side of the convertible sleeve closest to the center of the fixed plate. The side of the first clamping seat away from the convertible sleeve is a planar structure and has an anti-slip layer. A second clamping seat is fixedly connected to the side of the convertible sleeve away from the center of the fixed plate. A V-shaped groove is opened at the end of the second clamping seat away from the convertible sleeve. An anti-slip layer is provided inside the V-shaped groove. Each of the conversion sleeves is provided with a locking mechanism on its lower side to prevent the conversion sleeve from rotating; An adjustment mechanism is provided on the outside of the central column to synchronously adjust the spacing between the four moving columns.

[0007] In a preferred embodiment of the self-centering chuck device of this utility model, the locking mechanism includes a movable disk slidably connected to the outer wall of a movable column via two sliding grooves and two sliders. The lower end of the conversion sleeve has two limiting holes. The upper end of the movable disk is fixedly connected to two limiting posts that mate with the corresponding limiting holes. A threaded sleeve is fixedly connected to the outer wall of the movable column. A torsion block is threadedly connected to the outer wall of the threaded sleeve. A connecting ring is fixedly connected to the upper end of the torsion block. The lower end of the movable disk is provided with an annular limiting groove. A slip ring that slidably mates with the annular limiting groove is fixedly connected to the connecting ring.

[0008] As a preferred embodiment of the self-centering chuck device of this utility model, the adjustment mechanism includes a turntable rotatably connected to the outer wall of the central column via bearings. The turntable has four arc-shaped grooves extending through it. The outer walls of the four movable columns are rotatably connected to pulleys located inside the corresponding arc-shaped grooves via bearings. The lower end of the turntable is fixedly connected to a mounting cylinder, and the outer wall of the mounting cylinder is fixedly connected to a gear ring. The upper end of the support platform is rotatably connected to a rotating shaft, and the upper end of the rotating shaft is fixedly connected to a gear that meshes with the gear ring. The adjustment mechanism also includes a manual drive mechanism for driving the shaft to rotate.

[0009] As a preferred embodiment of the self-centering chuck device of this utility model, the manual drive mechanism includes a mounting cavity disposed inside the support platform, a worm gear rotatably connected inside the mounting cavity, a worm wheel meshing with the outer wall of the worm gear, a transmission shaft fixedly connected between the worm wheel and the rotating shaft, and a handwheel extending to the outside of the support platform fixedly connected to one end of the worm gear.

[0010] As a preferred embodiment of the self-centering chuck device of this utility model, the cross-section of the outer wall of the torsion block is hexagonal.

[0011] As a preferred embodiment of the self-centering chuck device of this utility model, mounting plates are fixedly connected to both ends of the outer wall of the support platform.

[0012] The beneficial effects of this utility model are: The rotatable conversion sleeve integrates a first clamping seat for square workpieces and a second clamping seat with a V-groove for cylindrical workpieces. During use, the first or second clamping seat is selected according to the shape of the workpiece and faces the center. After the conversion sleeve is fixed by the locking mechanism, the four moving columns are driven to move radially in sync by the adjustment mechanism, causing the selected first or second clamping seat to move closer to or away from the center. This achieves stable self-centering clamping of round and square workpieces with a single device, improving the flexibility of use and the range of applications. Attached Figure Description

[0013] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0014] Figure 1 This is a front sectional view of the self-centering chuck device of this utility model; Figure 2 This is a structural diagram of the turntable and arc-shaped groove of this utility model; Figure 3 This is a structural diagram of the fixing disc of this utility model; Figure 4 This is a structural diagram of the torsion block of this utility model; Figure 5 For the present utility model Figure 1 Enlarged view of point A in the middle; Figure 6 This is a partial top view of the present invention.

[0015] The markings in the diagram are: 1. Support platform; 2. Central column; 3. Fixed plate; 4. Guide groove; 5. Sliding sleeve; 6. Moving column; 7. Converting sleeve; 8. First card holder; 9. Second card holder; 10. V-groove; 11. Threaded sleeve; 12. Torsion block; 13. Connecting ring; 14. Moving plate; 15. Limiting hole; 16. Limiting column; 17. Turntable; 18. Arc groove; 19. Pulley; 20. Mounting cylinder; 21. Gear ring; 22. Rotating shaft; 23. Gear; 24. Mounting cavity; 25. Worm; 26. Worm wheel. Detailed Implementation

[0016] The present invention will be further described below with reference to the accompanying drawings and specific embodiments to aid in understanding its content. Unless otherwise specified, the methods used in this invention are conventional methods; the raw materials and apparatus used, unless otherwise specified, are conventional commercially available products.

[0017] Please see Figure 1-6 A self-centering chuck device includes a support platform 1, and a conversion clamping mechanism is provided on the upper side of the support platform 1 for self-centering clamping of cylindrical workpieces and square workpieces. The convertible clamping mechanism includes a central column 2 fixedly connected to the upper end of the support platform 1. A fixed plate 3 is fixedly connected to the upper end of the central column 2. Four guide grooves 4 are evenly distributed around the circumference through the fixed plate 3. A sliding sleeve 5 is slidably connected inside each guide groove 4 through two sliding grooves and two sliders. A moving column 6 is fixedly connected inside the sliding sleeve 5. A convertible sleeve 7 is rotatably connected to the outer wall of the moving column 6 through two bearings. A first clamping seat 8 is fixedly connected to the side of the convertible sleeve 7 near the center of the fixed plate 3. The side of the first clamping seat 8 away from the convertible sleeve 7 is a planar structure and is provided with an anti-slip layer. A second clamping seat 9 is fixedly connected to the side of the convertible sleeve 7 away from the center of the fixed plate 3. A V-shaped groove 10 is opened at the end of the second clamping seat 9 away from the convertible sleeve 7. An anti-slip layer is provided inside the V-shaped groove 10. Each conversion sleeve 7 is provided with a locking mechanism on its underside to prevent the conversion sleeve 7 from rotating; An adjustment mechanism is provided on the outside of the central column 2 to synchronously adjust the spacing between the four moving columns 6.

[0018] In this embodiment: During use, the operator needs to select the appropriate clamping mode based on whether the workpiece to be processed is square or cylindrical. If a square workpiece needs to be clamped, the operator manually rotates the conversion sleeve 7 so that the anti-slip layer on the plane of the first clamping seat 8 faces the center of the fixed plate 3. If a cylindrical workpiece needs to be clamped, the operator aligns the V-groove 10 of the second clamping seat 9 with the center of the fixed plate 3. After the clamping mode is selected, the conversion sleeve 7 needs to be fixed by the locking mechanism to prevent accidental rotation of the conversion sleeve 7 during processing.

[0019] When fixing the workpiece, the operator drives the four moving columns 6 to move synchronously radially along the guide groove 4 on the fixed plate 3 through the adjustment mechanism. When the four moving columns 6 approach each other, they drive the selected first clamping seat 8 or second clamping seat 9 to approach the center of the fixed plate 3 together, so as to achieve self-centering and stable clamping of the workpiece.

[0020] The device integrates two types of clamps for square and round workpieces through the conversion sleeve 7 design. Through the locking and adjustment mechanisms, it achieves stable self-centering clamping of two different shaped workpieces with a single device, improving the flexibility of use and the range of applications.

[0021] As a technical optimization of this utility model, the locking mechanism includes a movable disk 14 slidably connected to the outer wall of the movable column 6 via two sliding grooves and two sliders. The lower end of the conversion sleeve 7 is provided with two limiting holes 15. The upper end of the movable disk 14 is fixedly connected with two limiting posts 16 that cooperate with the corresponding limiting holes 15. The outer wall of the movable column 6 is fixedly connected with a threaded sleeve 11. The outer wall of the threaded sleeve 11 is threadedly connected with a torsion block 12. The upper end of the torsion block 12 is fixedly connected with a connecting ring 13. The lower end of the movable disk 14 is provided with an annular limiting groove. A slip ring that slides in cooperation with the annular limiting groove is fixedly connected to the connecting ring 13.

[0022] In this embodiment: During operation, the torsion block 12 is tightened. Since the torsion block 12 is threadedly connected to the threaded sleeve 11 fixed to the outer wall of the moving column 6, the torsion block 12 pushes the moving disk 14 to slide upward along the moving column 6 through the connecting ring 13, so that the limiting post 16 at the upper end of the moving disk 14 is inserted into the limiting hole 15 at the lower end of the conversion sleeve 7. Thus, the circumferential rotation of the conversion sleeve 7 is effectively locked, ensuring the stability during processing.

[0023] As a technical optimization of this utility model, the adjustment mechanism includes a turntable 17 rotatably connected to the outer wall of the central column 2 via bearings. Four arc-shaped grooves 18 are provided through the turntable 17. The outer walls of the four movable columns 6 are rotatably connected to pulleys 19 located inside the corresponding arc-shaped grooves 18 via bearings. The lower end of the turntable 17 is fixedly connected to a mounting cylinder 20. The outer wall of the mounting cylinder 20 is fixedly connected to a gear ring 21. The upper end of the support platform 1 is rotatably connected to a rotating shaft 22. The upper end of the rotating shaft 22 is fixedly connected to a gear 23 that meshes with the gear ring 21. The adjustment mechanism also includes a manual drive mechanism for driving the rotating shaft 22 to rotate.

[0024] In this embodiment: when the manual drive mechanism drives the gear 23 fixed on the upper end of the rotating shaft 22 to rotate, the gear 23 drives the gear ring 21 meshing with it to rotate. The gear ring 21 drives the turntable 17 to rotate around the central column 2 through the mounting cylinder 20. The four arc grooves 18 on the turntable 17 rotate accordingly. Since the pulleys 19 on each moving column 6 are respectively embedded in the corresponding arc grooves 18, the rotational motion of the turntable 17 is converted into the synchronous radial movement of the four moving columns 6 along the guide grooves 4 on the fixed disk 3 through the cooperation of the arc grooves 18 and the pulleys 19. When the turntable 17 rotates clockwise, the four moving columns 6 approach each other, thereby driving the selected first clamping seat 8 or second clamping seat 9 to approach the center of the fixed disk 3 together, realizing the self-centering and stable clamping of the workpiece.

[0025] As a technical optimization of this utility model, the manual drive mechanism includes a mounting cavity 24 disposed inside the support platform 1. A worm gear 25 is rotatably connected inside the mounting cavity 24. A worm wheel 26 is meshed with the outer wall of the worm gear 25. A transmission shaft is fixedly connected between the worm wheel 26 and the rotating shaft 22. A handwheel extending to the outside of the support platform 1 is fixedly connected to one end of the worm gear 25.

[0026] In this embodiment: the operator turns the handwheel, which drives the worm 25 to rotate. The worm 25 drives the worm wheel 26 meshing with it to rotate. The worm wheel 26 transmits power to the rotating shaft 22 through the transmission shaft, which drives the gear 23 fixed to the upper end of the rotating shaft 22 to rotate. Since the worm 25 and the worm wheel 26 have a self-locking characteristic, the rotating shaft 22 is prevented from rotating on its own when the handwheel is not turned, thus ensuring the stability of the clamping.

[0027] As a technical optimization of this utility model, the cross-section of the outer wall of the torsion block 12 is a hexagonal structure.

[0028] In this embodiment, the hexagonal structure of the outer wall of the torsion block 12 facilitates the application of force with a wrench, ensuring that the locking operation is convenient and reliable.

[0029] As a technical optimization of this utility model, mounting plates are fixedly connected to both ends of the outer wall of the support platform 1.

[0030] In this embodiment, the device can be mounted and fixed using two mounting plates.

[0031] The working principle and usage process of this utility model: When using it, the operator needs to select the corresponding clamping mode according to whether the workpiece to be processed is square or cylindrical. If a square workpiece needs to be clamped, the anti-slip layer on the plane of the first clamping seat 8 is turned towards the center of the fixed plate 3 by manually rotating the conversion sleeve 7. If a cylindrical workpiece needs to be clamped, the V-groove 10 of the second clamping seat 9 is turned towards the center of the fixed plate 3.

[0032] After the clamping mode is selected, the conversion sleeve 7 needs to be fixed by the locking mechanism to prevent the conversion sleeve 7 from rotating accidentally during the processing. During operation, tighten the torsion block 12. Since the torsion block 12 is threadedly connected to the threaded sleeve 11 fixed to the outer wall of the moving column 6, the torsion block 12 pushes the moving disk 14 to slide upward along the moving column 6 through the connecting ring 13, so that the limiting post 16 at the upper end of the moving disk 14 is inserted into the limiting hole 15 at the lower end of the conversion sleeve 7. At this point, the circumferential rotation of the conversion sleeve 7 is effectively locked, ensuring the stability during processing.

[0033] When the workpiece is fixed, the operator turns the handwheel, which drives the worm gear 25 to rotate. The worm gear 25 drives the worm wheel 26 that meshes with it to rotate. The worm wheel 26 transmits power to the rotating shaft 22 through the transmission shaft, which drives the gear 23 fixed to the upper end of the rotating shaft 22 to rotate. The gear 23 then drives the gear ring 21 that meshes with it to rotate. The gear ring 21 drives the turntable 17 to rotate around the central column 2 through the mounting cylinder 20. The four arc-shaped grooves 18 on the turntable 17 rotate accordingly. Since the pulleys 19 on each moving column 6 are respectively embedded in the corresponding arc-shaped grooves 18, the rotational motion of the turntable 17 is converted into the synchronous radial movement of the four moving columns 6 along the guide grooves 4 on the fixed plate 3 through the cooperation of the arc-shaped grooves 18 and the pulleys 19. When the turntable 17 rotates clockwise, the four moving columns 6 move closer to each other, thereby driving the selected first clamping seat 8 or second clamping seat 9 to move closer to the center of the fixed plate 3, realizing the self-centering and stable clamping of the workpiece.

[0034] The device integrates two types of clamps for square and round workpieces through the conversion sleeve 7 design. Through the locking and adjustment mechanisms, it achieves stable self-centering clamping of two different shaped workpieces with a single device, improving the flexibility of use and the range of applications.

[0035] In the description of this utility model, it should be understood that the terms "left", "right", "up", "down", "top", "bottom", "front", "back", "inner", "outer", "back", "middle", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0036] However, the above description is only a specific embodiment of this utility model and should not be construed as limiting the scope of implementation of this utility model. Therefore, any substitution of equivalent components or equivalent changes and modifications made in accordance with the scope of protection of this utility model should still fall within the scope of the claims of this utility model.

Claims

1. A self-centering chuck device, comprising a support platform (1), characterized in that: The upper side of the support platform (1) is provided with a conversion clamping mechanism for self-centering clamping of cylindrical and square workpieces. The convertible clamping mechanism includes a central column (2) fixedly connected to the upper end of the support platform (1). A fixed plate (3) is fixedly connected to the upper end of the central column (2). Four guide grooves (4) are evenly distributed in the circumferential direction through the fixed plate (3). A sliding sleeve (5) is slidably connected inside each guide groove (4) through two sliding grooves and two sliders. A moving column (6) is fixedly connected inside the sliding sleeve (5). A convertible sleeve (7) is rotatably connected to the outer wall of the moving column (6) through two bearings. A first clamping seat (8) is fixedly connected to the side of the convertible sleeve (7) near the center of the fixed plate (3). The side of the first clamping seat (8) away from the convertible sleeve (7) is a planar structure and is provided with an anti-slip layer. A second clamping seat (9) is fixedly connected to the side of the convertible sleeve (7) away from the center of the fixed plate (3). A V-shaped groove (10) is opened at the end of the second clamping seat (9) away from the convertible sleeve (7). An anti-slip layer is provided in the V-shaped groove (10). Each of the conversion sleeves (7) is provided with a locking mechanism on its lower side to prevent the conversion sleeve (7) from rotating; An adjustment mechanism is provided on the outside of the central column (2) for synchronously adjusting the spacing between the four moving columns (6).

2. The self-centering chuck device according to claim 1, characterized in that: The locking mechanism includes a movable disk (14) slidably connected to the outer wall of the movable column (6) via two sliding grooves and two sliders. The lower end of the conversion sleeve (7) has two limiting holes (15). The upper end of the movable disk (14) is fixedly connected to two limiting posts (16) that cooperate with the corresponding limiting holes (15). The outer wall of the movable column (6) is fixedly connected to a threaded sleeve (11). The outer wall of the threaded sleeve (11) is threadedly connected to a torsion block (12). The upper end of the torsion block (12) is fixedly connected to a connecting ring (13). The lower end of the movable disk (14) is provided with an annular limiting groove. The connecting ring (13) is fixedly connected to a slip ring that slidably cooperates with the annular limiting groove.

3. The self-centering chuck device according to claim 1, characterized in that: The adjustment mechanism includes a turntable (17) rotatably connected to the outer wall of the central column (2) via bearings. Four arc-shaped grooves (18) are provided through the turntable (17). The outer walls of the four movable columns (6) are rotatably connected to pulleys (19) located inside the corresponding arc-shaped grooves (18) via bearings. The lower end of the turntable (17) is fixedly connected to a mounting cylinder (20). The outer wall of the mounting cylinder (20) is fixedly connected to a gear ring (21). The upper end of the support platform (1) is rotatably connected to a rotating shaft (22). The upper end of the rotating shaft (22) is fixedly connected to a gear (23) that meshes with the gear ring (21). The adjustment mechanism also includes a manual drive mechanism for driving the rotating shaft (22) to rotate.

4. The self-centering chuck device according to claim 3, characterized in that: The manual drive mechanism includes a mounting cavity (24) disposed inside the support platform (1), a worm gear (25) is rotatably connected inside the mounting cavity (24), a worm wheel (26) is meshed with the outer wall of the worm gear (25), a drive shaft is fixedly connected between the worm wheel (26) and the rotating shaft (22), and a handwheel extending to the outside of the support platform (1) is fixedly connected to one end of the worm gear (25).

5. A self-centering chuck device according to claim 2, characterized in that: The cross-section of the outer wall of the torsion block (12) is hexagonal.

6. The self-centering chuck device according to claim 1, characterized in that: Mounting plates are fixedly connected to both ends of the outer wall of the support platform (1).

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