Chuck structure with high positioning precision

Abstract

The utility model relates to the technical field of positioning chucks, in particular to a chuck structure with high positioning accuracy, which comprises a chuck body, a plurality of clamping jaws capable of moving concentrically are arranged at one end of the chuck body, a positioning plate is further connected to the end of the chuck body, and the outer end face of the positioning plate is a supporting plane for supporting workpieces. The positioning disc does not move along with the clamping jaws but is fixed relative to the chuck body, the supporting planeness of the lower end face of the to-be-machined workpiece can be improved through the positioning disc, and therefore the end face machining precision of the workpiece is improved. And the trouble of leveling for multiple times when the workpiece or the clamping jaw is replaced is avoided, so that the machining efficiency can be improved.

Description

Technical Field

[0001] This utility model relates to the field of positioning chuck technology, specifically to a chuck structure with high positioning accuracy. 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 7 The diagram shows a partial structural diagram. This three-jaw cylinder is also a conventional structure. The workpiece is clamped between the three jaws 8 or between the stepped surfaces of the three jaws 8. Since the jaws are moving parts that move frequently, and due to the influence of manufacturing errors, the supporting planes 81 in the stepped surfaces of the three jaws 8 cannot be on the same plane. Therefore, it is difficult to meet the requirements for high precision machining of the workpiece end face. It can only be leveled manually before machining. Once the jaws move or are replaced, they must be leveled again. Utility Model Content

[0003] The purpose of this invention is to provide a chuck structure with high positioning accuracy to solve the problems mentioned above.

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

[0005] The high-precision chuck structure includes a chuck body, with several concentrically movable jaws at one end of the chuck body. A positioning plate is also connected to this end of the chuck body, and the outer end face of the positioning plate is a support plane for supporting the workpiece.

[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.

[0008] Furthermore, the base is L-shaped and includes a sliding part that slides with the chuck body and a vertically arranged support part. The support part is located at the outer end of the sliding part, and the chuck is detachably connected to the support part. The sliding part is located below the positioning plate.

[0009] Furthermore, the chuck includes a clamping portion for clamping the workpiece, the clamping portion being located above the positioning plate.

[0010] Furthermore, the chuck also includes a connecting portion, which is L-shaped with the clamping portion, and the connecting portion is detachably connected to the support portion.

[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, the positioning plate is connected to the support by screws, and three support tubes are spaced apart on the outer edge of the end of the chuck body, and the outer end of the support is connected to the upper end of the support tube.

[0013] Furthermore, the bracket has a positioning boss at its center, and the positioning plate has a positioning groove at its center that mates with the positioning boss.

[0014] Furthermore, the chuck body has the structure of a pneumatic chuck.

[0015] The beneficial effects of this utility model are:

[0016] This invention features a positioning plate connected to the end of the chuck body. The outer end face of the positioning plate serves as a support plane for the workpiece. This support plane is pre-machined and has a high degree of flatness, meeting the workpiece's positioning requirements. The grippers center and hold the workpiece. The bottom of the workpiece is supported not by the grippers but by the positioning plate, thus improving the flatness of the lower end face of the workpiece and ensuring higher precision when machining the other end face.

[0017] The positioning plate does not move with the gripper, but is fixed relative to the chuck body. Therefore, the long-term reciprocating motion of the gripper will not affect the positioning accuracy of the positioning plate. It only needs to be leveled once during the initial installation and use of the positioning plate, avoiding the trouble of leveling multiple times when changing workpieces or grippers, thus improving processing efficiency. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the external shape of the high-precision chuck structure of this utility model;

[0019] Figure 2 It is a 3D view of the positioning disc;

[0020] Figure 3 It is a 3D diagram of the support frame;

[0021] Figure 4 It is a three-dimensional diagram of a clamp;

[0022] Figure 5 It is a 3D diagram of another type of clamp;

[0023] Figure 6 This is a partial structural diagram of the high-precision chuck structure of this utility model;

[0024] Figure 7 This is a partial structural view of a pneumatic chuck in the prior art.

[0025] 1. Chuck body; 11. First connecting hole; 12. Second connecting hole; 2. Positioning plate; 21. Screw hole; 22. Supporting plane; 3. Gripper; 31. Chuck head; 311. Clamping part; 312. Connecting part; 32. Base; 321. Support part; 33. First screw; 4. Support tube; 5. Second screw; 6. Support; 61. Positioning boss; 62. U-shaped groove; 7. Chuck head; 8. Gripper; 81. Supporting plane. Detailed Implementation

[0026] 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.

[0027] Embodiments of this utility model:

[0028] like Figure 1 As shown, the high-precision chuck structure includes a chuck body 1. One end of the chuck body 1 has several concentrically movable jaws 3. The chuck body 1 is a pneumatic chuck structure; this embodiment uses a pneumatic chuck as an example. The pneumatic chuck uses pneumatic pressure to drive each jaw 3 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 for connecting the tracheal tube connector.

[0029] There are three grippers 3, which are evenly spaced along the circumference of the chuck body 1.

[0030] like Figure 1 and 2 As shown, a positioning plate 2 is also connected to this end of the chuck body 1. The outer end face of the positioning plate 2 is a support plane 22 for supporting the workpiece. The support plane 22 is pre-machined, and its flatness meets the requirements. By designing this positioning plate 2, this utility model improves the flatness of the support plane 22 on the lower end face of the workpiece, thereby achieving higher precision when machining the other end face. The chuck structure of this utility model is mainly used in equipment such as laser cutting machines. The workpieces processed are generally made of ultra-hard materials, belonging to the precision machining industry, which requires high machining accuracy. The workpiece shape is a disc of different specifications or a cylinder.

[0031] like Figure 1As shown, the gripper 3 includes a base 32 and a chuck 31 detachably connected to the base 32. Figure 1 A clamp 31 is shown in the figure.

[0032] The base 32 is L-shaped and includes a sliding part that slides with the chuck body 1 and a vertically arranged support part 321. The support part 321 is located at the outer end of the sliding part and extends upward relative to the sliding part. The sliding part that slides with the chuck body 1 includes a bottom T-shaped block and a connecting block connected to its upper part by screws. The connecting block and the support part 321 are integrally formed. Since the positioning disk 2 is fixed and located in the central area, to avoid motion interference, the sliding part is located below the positioning disk 2. The positioning disk 2 is suspended and spaced apart from the sliding part.

[0033] like Figure 4 As shown, the chuck 31 includes a clamping part 311 for clamping the workpiece. The clamping part 311 is located above the positioning disk 2 and does not interfere with the positioning disk 2.

[0034] This embodiment achieves replaceability of the chuck 31 by detachably connecting the chuck 31 and the support part 321, providing a wide range of clamping sizes and adapting to workpieces of various diameters. The clamping part 311 has a plate-like structure, varying in length, and the shape of its end near the workpiece can also be changed as needed. Figure 4 A type of chuck 31 is shown, such as Figure 5 Another type of chuck 7 is shown. In other embodiments, a straight-plate chuck may also be used, with one end of the chuck fixed to the upper end of the support by screws, and the other end used to contact the side of the workpiece.

[0035] The chuck 31 also includes a connecting portion 312, which is L-shaped with the clamping portion 311 and is detachably connected to the support portion 321. The connecting portion 312 is located inside the support portion 321 and can be connected by a first screw 33. The connecting portion 312 is provided with a through hole through which the first screw 33 passes.

[0036] The positioning plate 2 is suspended at the end of the chuck body 1 by a bracket 6, which is detachably connected to the end of the chuck body 1.

[0037] The support 6 is a tripod. The positioning plate 2 is connected to the support 6 by screws. The screw holes 21 on the positioning plate 2 are countersunk holes, and the screws do not protrude from the support plane 22 of the positioning plate 2. Three support tubes 4 are spaced apart on the outer edge of the end of the chuck body 1. The outer end of the support 6 is connected to the upper end of the support tubes 4. The support tubes 4 have internal threaded holes, and the outer ends of the legs of the support 6 are connected by second screws 5.

[0038] The lower side of the outer end of the support leg is provided with a U-shaped groove 62, which matches the outer cylindrical surface of the upper end of the support tube 4, and has a certain positioning function during initial installation.

[0039] The bracket 6 has a circular positioning boss 61 at its center, and the positioning plate 2 has a positioning groove at its center that mates with the positioning boss 61. The three legs of the bracket 6 are evenly spaced along the circumference of the positioning boss 61, and each leg is located between two grippers 3, resulting in a compact structure that avoids interference.

[0040] 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.

[0041] 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 with high positioning accuracy, characterized in that: It includes a chuck body, one end of which is provided with several jaws that can move concentrically, and this end of the chuck body is also connected to a positioning plate, the outer end face of which is a support plane for supporting the workpiece.

2. The high-precision chuck structure 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 high-precision chuck structure according to claim 1, characterized in that: The gripper includes a base and a chuck that is detachably connected to the base.

4. The high-precision chuck structure according to claim 3, characterized in that: The base is L-shaped and includes a sliding part that slides with the chuck body and a vertically arranged support part. The support part is located at the outer end of the sliding part, and the chuck is detachably connected to the support part. The sliding part is located below the positioning plate.

5. The high-precision chuck structure according to claim 4, characterized in that: The chuck includes a clamping part for clamping the workpiece, and the clamping part is located above the positioning plate.

6. The high-precision chuck structure according to claim 5, characterized in that: The chuck also includes a connecting part, which is L-shaped with the clamping part, and the connecting part is detachably connected to the support part.

7. The high-precision chuck structure 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 high-precision chuck structure according to claim 7, characterized in that: The bracket is a tripod, and the positioning plate is connected to the bracket by screws. The outer edge of the end of the chuck body is provided with three support tubes at intervals, and the outer end of the bracket is connected to the upper end of the support tubes.

9. The high-precision chuck structure according to claim 8, characterized in that: The bracket has a positioning boss at its center, and the positioning plate has a positioning groove at its center that mates with the positioning boss.

10. The high-precision chuck structure according to any one of claims 1 to 9, characterized in that: The chuck body has the structure of a pneumatic chuck.

Images