Chuck structure for thin workpiece

Abstract

The utility model relates to the technical field of positioning chucks, in particular to a chuck structure for a thin workpiece. The chuck structure for the thin workpiece comprises a chuck body, a plurality of clamping jaws capable of moving in the radial direction of the chuck body are arranged at one end of the chuck body, and the clamping jaws act synchronously and are used for centering the workpiece. The end of the chuck body is connected with a positioning disc, the outer end face of the positioning disc is connected with a vacuum suction cup, and the vacuum suction cup is used for sucking a workpiece to be machined. And the vacuum chuck is used for adsorbing the thin workpiece, so that the thin workpiece is prevented from being extruded and deformed by overlarge clamping force of the clamping jaw, and the positioning requirement of the thin workpiece in the machining process is met.

Description

Technical Field

[0001] This utility model relates to the field of positioning chuck technology, and specifically to a chuck structure for thin workpieces. Background Technology

[0002] A pneumatic three-jaw chuck is a clamping device driven by a pneumatic system, widely used in machining, automated production lines, and other fields, mainly for quickly clamping cylindrical or symmetrical workpieces. For example, a rotary pneumatic clamping operating table disclosed in patent announcement number CN220699357U has a fixed platform fixedly installed at the bottom of the worktable, a servo motor fixedly installed on one side of the fixed platform, a rotating platform rotatably connected inside the fixed platform, a fixed plate fixedly installed on one side of the rotating platform, and a three-jaw cylinder fixedly installed on the top of the fixed plate. Figure 1 The diagram shows a partial structural representation. This three-jaw cylinder is a conventional structure, where the workpiece is clamped between three jaws 8 or between the stepped surfaces of the three jaws 8. Since the jaws are frequently moving parts, and due to manufacturing errors, the supporting planes 81 on the stepped surfaces of the three jaws 8 are not always on the same plane. Therefore, it is difficult to meet the high precision requirements for workpiece end face machining, requiring manual leveling before each machining operation. Furthermore, this chuck structure cannot clamp thin workpieces because the upper edge of the jaws will obstruct the upper outer edge of the workpiece, affecting the machining of the upper surface of thin workpieces. Additionally, thin workpieces cannot be directly clamped into place by the jaws, as this may cause workpiece deformation. Utility Model Content

[0003] The purpose of this invention is to provide a chuck structure for thin workpieces, enabling the clamping and positioning of thin workpieces during processing.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A chuck structure for thin workpieces includes a chuck body, one end of which is provided with a plurality of grippers that can move radially along the chuck body, the plurality of grippers moving synchronously to center the workpiece; a positioning disk is connected to the end of the chuck body, and a vacuum suction cup is connected to the outer end face of the positioning disk, the vacuum suction cup being used to adsorb the workpiece to be processed.

[0006] Furthermore, the gripper has three claws, which are evenly spaced along the circumference of the chuck body.

[0007] Furthermore, the gripper includes a base and a chuck detachably connected to the base. The chuck includes a pushing part for abutting the workpiece, and the pushing part is located above the positioning plate.

[0008] Furthermore, the clamp is Z-shaped, with one vertically positioned end connected to the base body and the other vertically positioned end forming the pushing part.

[0009] Furthermore, the upper end of the pusher is higher than the upper surface of the vacuum suction cup.

[0010] Furthermore, the bottom of the vacuum suction cup is connected to the positioning plate by screws, and the two are sealed together.

[0011] Furthermore, the positioning disc is suspended at the end of the chuck body by a bracket, which is detachably connected to the end of the chuck body.

[0012] Furthermore, the support is a tripod, with its three legs horizontally positioned and evenly spaced along a circumferential direction.

[0013] The beneficial effects of this utility model are:

[0014] During processing, thin workpieces are first placed on the upper surface of the vacuum chuck. Before evacuation, the workpiece is centered using the synchronized movement of the three grippers. Once the workpiece is in the center position, the vacuum chuck is evacuated, creating negative pressure and suction force to hold the workpiece. The three grippers are then retracted, and the workpiece is simply held in place by the vacuum chuck during processing. This avoids excessive clamping force from deforming the thin workpiece. Furthermore, the retracted grippers do not obstruct the upper part of the workpiece and do not affect the processing of the outer edge of the upper surface.

[0015] The positioning plate is fixed, and the position of the vacuum suction cup is also fixed, so it is not affected by the movement of the gripper. When changing the workpiece, there is no need to level it multiple times, which improves the processing efficiency. Attached Figure Description

[0016] Figure 1 This is a partial structural view of a pneumatic chuck in the prior art;

[0017] Figure 2 This is a schematic diagram of the external shape of the high-precision chuck structure of this utility model;

[0018] Figure 3 It is a 3D view of the positioning disc;

[0019] Figure 4 It is a 3D diagram of the support frame;

[0020] Figure 5 It is a 3D diagram of the clamp;

[0021] Figure 6 This is a schematic diagram (rotated sectional view) illustrating the principle of the high-precision chuck structure of this utility model for centering and supporting the workpiece.

[0022] 1. Chuck body; 11. First connecting hole; 12. Second connecting hole; 2. Positioning plate; 21. Countersunk hole; 31. Base; 32. Chuck; 321. Pushing part; 322. Through hole; 4. Bracket; 41. Support leg; 5. Screw; 6. Vacuum suction cup; 61. Air connector; 7. Workpiece; 8. Clamping jaw; 81. Support plane. Detailed Implementation

[0023] 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 skilled in the art are within the protection scope of the present utility model.

[0024] Embodiments of this utility model:

[0025] like Figures 2-6 As shown, a chuck structure for thin workpieces includes a chuck body 1. One end of the chuck body 1 is provided with a plurality of grippers that can move radially along the chuck body 1. There are three grippers, which are evenly spaced along the circumference of the chuck body 1.

[0026] The chuck body 1 is a pneumatic chuck structure; that is, this embodiment uses a pneumatic chuck as an example for description. The pneumatic chuck uses pneumatic pressure to drive each jaw to move towards the same center or in opposite directions synchronously. The principle of the pneumatic chuck is existing technology and will not be elaborated further. Figure 1 The diagram shows the first connection hole 11 and the second connection hole 12 of the air pipe connector, which are used for air inlet and outlet and for controlling the movement of the gripper. In this embodiment, the pneumatic chuck is used on a laser cutting machine, where the laser processing head and the workpiece are non-contact, utilizing the high temperature of the laser to process the workpiece.

[0027] The three grippers move synchronously to center the workpiece 7. This is different from conventional centering and clamping. Because it is for thin workpiece 7, the thin workpiece 7 in this embodiment can be understood as a round workpiece with a relatively thin thickness.

[0028] A positioning disk 2 is connected to one end of the chuck body 1. A vacuum suction cup 6 is connected to the outer end face of the positioning disk 2. The vacuum suction cup 6 is used to adsorb the workpiece 7 to be processed. The upper end face of the positioning disk 2 is a precision-machined surface with high flatness. In this embodiment, the vacuum suction cup 6 has a cylindrical structure. The bottom of the vacuum suction cup 6 is connected to the positioning disk 2 by screws 5, and the two are sealed together. The upper part of the vacuum suction cup 6 is open, and the upper end face is a precision-machined flat surface used to support the workpiece 7.

[0029] The bottom of the vacuum suction cup 6 has a screw hole. The screw that fixes the vacuum suction cup 6 passes through the inside of the vacuum suction cup 6. A sealing gasket can be installed between the bottom of the vacuum suction cup 6 and the positioning plate 2. With the clamping force of the screw, a seal is achieved.

[0030] A gas connector 61 is connected to the outer periphery of the vacuum chuck 6 for connecting a gas pipe to the vacuum pumping device. One end of the gas pipe connects to the gas connector 61, and the other end can connect to the third connecting hole (not shown) on the chuck body 1, effectively adding an extra gas path to the existing chuck body 1. By evacuating the vacuum chuck 6, a negative pressure is generated, creating an adsorption force on the workpiece 7, thus clamping the workpiece 7 and keeping it in its position. Before evacuating, the workpiece 7 is centered using the synchronous movement of the three jaws. When machining the workpiece 7, the three jaws can be retracted, and the vacuum chuck 6 can then adsorb the workpiece 7, avoiding excessive clamping force that could deform the workpiece 7.

[0031] The gripper includes a base 31 and a chuck 32 detachably connected to the base 31. Figure 1 (As shown in the diagram), the chuck 32 includes a pusher 321 for abutting the workpiece 7, and the pusher 321 is located above the positioning disk 2. The seat 31 is slidably engaged with the chuck body 1, and the horizontal section of the seat 31 moves below the positioning disk 2. The chuck 32 moves above the positioning disk 2 and does not interfere with the positioning disk 2.

[0032] like Figure 4 As shown, the chuck 32 is Z-shaped, with one vertically positioned end connected to the base 31. This end has a through hole 322, and the other vertically positioned end forms the aforementioned pushing part 321. The upper end of the pushing part 321 is higher than the upper surface of the vacuum chuck 6. When centering the workpiece 7, the pushing part 321 is used to contact the outer peripheral surface of the workpiece 7. Between the two ends is a flat plate, which can be understood as the chuck 32 being a double-bent component.

[0033] like Figure 3 As shown, the support 4 is a tripod. The center of the support 4 is a solid part, and the three legs 41 are horizontally set and evenly distributed along a circumference. The gripper base 31 is distributed in the triangular space between the two legs 41, so the arrangement of the legs 41 does not affect the movement of the gripper.

[0034] like Figure 2 As shown, the positioning plate 2 is suspended from the end of the chuck body 1 by the bracket 4. The positioning plate 2 is connected to each support leg 41 by screws. The positioning plate 2 has a countersunk hole 21 that runs vertically through it for screws to pass through. The ends of the support legs 41 are connected to the chuck body 1 by screws 5.

[0035] The principle of the chuck structure for thin workpieces 7 in this utility model:

[0036] The thin workpiece 7 is first placed on the upper surface of the vacuum chuck 6. Before vacuuming, the workpiece 7 is centered using the synchronized movement of the three grippers. At this point, excessive clamping force is not required; it is sufficient to move the workpiece 7 towards the center to complete the centering. Figure 6 As shown, a vacuum is drawn into the vacuum chuck 6, creating negative pressure and generating an adsorption force on the workpiece 7, thus achieving the purpose of clamping the workpiece 7. The three grippers are then retracted, and during the processing of the workpiece 7, the vacuum chuck 6 is used to hold the workpiece 7, avoiding the deformation of the thin workpiece 7 due to excessive clamping force. Simultaneously, after the grippers retract, there is no obstruction to the upper end of the workpiece 7, and it does not affect the processing of the upper surface of the workpiece 7. Furthermore, the positioning plate 2 is fixed, and the position of the vacuum chuck 6 is also fixed, eliminating the need for multiple leveling operations when changing workpieces 7, thus improving processing efficiency.

[0037] The serial numbers assigned to components in this document, such as "first" and "second," are used only to distinguish the described objects and have no sequential or technical meaning. The terms "connection" and "linkage" used in this application, unless otherwise specified, include both direct and indirect connections (linkages). In the description of this utility model, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and for 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.

[0038] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

Claims

1. A chuck structure for thin workpieces, characterized in that: The chuck body includes a chuck body, one end of which is provided with a plurality of grippers that can move radially along the chuck body. The plurality of grippers move synchronously to center the workpiece. A positioning plate is connected to this end of the chuck body, and a vacuum suction cup is connected to the outer end face of the positioning plate. The vacuum suction cup is used to adsorb the workpiece to be processed.

2. The chuck structure for thin workpieces according to claim 1, characterized in that: The chuck has three grippers, which are evenly spaced along the circumference of the chuck body.

3. The chuck structure for thin workpieces according to claim 2, characterized in that: The gripper includes a base and a chuck detachably connected to the base. The chuck includes a pusher for abutting the workpiece, and the pusher is located above the positioning plate.

4. The chuck structure for thin workpieces according to claim 3, characterized in that: The clamp is Z-shaped, with one vertical end connected to the base and the other vertical end forming the pushing part.

5. The chuck structure for thin workpieces according to claim 3, characterized in that: The upper end of the pusher is higher than the upper surface of the vacuum suction cup.

6. The chuck structure for thin workpieces according to claim 1, characterized in that: The bottom of the vacuum suction cup is connected to the positioning plate by screws, and the two are sealed together.

7. The chuck structure for thin workpieces according to claim 1, characterized in that: The positioning plate is suspended at the end of the chuck body by a bracket, which is detachably connected to the end of the chuck body.

8. The chuck structure for thin workpieces according to claim 7, characterized in that: The support is a tripod, with its three legs horizontally positioned and evenly spaced along a circumference.

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