Centering adjusting tool
By designing the inclined wedge effect of the lifting block and the movable block, as well as the centering adjustment tooling of the trapezoidal jaws and bevel gear meshing, the problem of stable clamping of workpieces with uneven lower end faces by the three-jaw chuck was solved, and stable support and precise centering of the workpiece were achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHANDONG MINGHONG NEW ENERGY TECH CO LTD
- Filing Date
- 2025-06-26
- Publication Date
- 2026-05-19
AI Technical Summary
Existing three-jaw chucks are unable to stably clamp workpieces with uneven lower end faces, resulting in loosening or unstable centering during processing.
A centering adjustment fixture was designed. Through the threaded connection of the lifting block and the movable block, the inclined plane wedge effect is used to achieve stable support and uniform clamping of the workpiece. Combined with the meshing of trapezoidal jaws and bevel gears, reliable centering and clamping of the workpiece are achieved.
It achieves stable and uniform support and reliable centering clamping for workpieces with uneven lower end faces, ensuring stability and accuracy during the machining process.
Smart Images
Figure CN224255181U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of adjustment tooling technology, specifically a centering adjustment tooling. Background Technology
[0002] Three-jaw chucks are commonly used tooling for fixing workpieces. The automatic centering function of a three-jaw chuck relies on the three jaws simultaneously and equidistantly clamping the workpiece radially. However, for workpieces with uneven lower surfaces, it means that the workpiece cannot stably and evenly fit against the chuck's positioning surface. For such workpieces, during processing, thin copper sheets, paper sheets, or thin metal sheets are usually carefully selected at positions between the workpiece's high point and the chuck's positioning surface in an attempt to level it. However, the shims may be crushed or displaced, causing the workpiece to loosen during clamping or processing. Summary of the Invention
[0003] The technical problem to be solved by this utility model is to design a centering adjustment fixture that can compensate for the unevenness of the lower end face of the workpiece, ensure that the workpiece obtains stable and uniform support, and at the same time maintain reliable centering and clamping.
[0004] To solve the above-mentioned technical problems, the centering adjustment fixture of this utility model includes a base plate and a chuck fixed on the base plate. A support plate is fixed on the base plate, and a lifting block is sleeved on the support plate. The lower end surface of the lifting block is an inclined surface. A movable block is arranged below the lifting block. The upper end surface of the movable block is an inclined surface adapted to the lower end surface of the lifting block. The movable block is threadedly connected to the support plate. A fixing block is arranged below the movable block and is fixed on the support plate.
[0005] Preferably, it also includes an adjusting bolt, wherein both the movable block and the support plate have threaded holes, and the adjusting bolt can be threadedly connected to the threaded holes of the movable block and the support plate.
[0006] Preferably, the chuck includes a disc body fixed on the base plate, and three sets of slots are evenly distributed in a ring on the disc body. A trapezoidal claw is slidably arranged in the slot. A first threaded tooth is formed on the lower end face of the trapezoidal claw. The first threaded tooth meshes with a second threaded tooth. The second threaded tooth is formed on the upper end face of a first bevel gear. The first bevel gear is rotatably mounted in the disc body.
[0007] Preferably, the lower end face of the first bevel gear meshes with the second bevel gear, the second bevel gear is rotatably mounted in the disc body, and three sets of the second bevel gear are evenly arranged in a ring.
[0008] Preferably, the end of the second bevel gear is provided with a square hole for inserting a wrench, one end of the wrench is square to fit the square hole, and a through hole is provided on the wrench, through which a rotating rod is inserted.
[0009] Preferably, a limiting ring is formed on the outer circumference of the second bevel gear, and a limiting rod slides within the limiting ring, the limiting rod being fixed to the disc body.
[0010] Preferably, the lifting block has a T-shaped groove, which slides in conjunction with the support plate.
[0011] In summary, the beneficial effects of this utility model are as follows:
[0012] The movable block is driven to move up and down along the axis of the support plate via a threaded drive. The upper end face of the movable block abuts against the lower end face of the lifting block. Subsequently, the inclined wedge effect converts the axial displacement of the movable block into the vertical displacement of the lifting block. This can compensate for the unevenness of the lower end face of the workpiece, ensuring that the workpiece receives stable and uniform support while maintaining reliable centering and clamping. Attached Figure Description
[0013] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:
[0014] Figure 1 This is a schematic diagram of the centering adjustment tool of this utility model;
[0015] Figure 2 This is a schematic diagram of the internal structure of the chuck;
[0016] Figure 3 This is a schematic diagram showing the interaction between the second bevel gear and the wrench;
[0017] Figure 4 for Figure 1 A magnified view of part A.
[0018] In the diagram: 1-base plate; 2-chuck; 21-disc body; 22-chuck groove; 23-trapezoidal claw; 24-first threaded tooth; 25-second threaded tooth; 26-first bevel gear; 27-second bevel gear; 28-limiting ring; 29-limiting rod; 3-support plate; 30-lifting block; 31-moving block; 32-fixed block; 33-adjusting bolt; 38-T-slot; 4-wrench; 5-rotating rod. Detailed Implementation
[0019] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.
[0020] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", 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 application 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 application.
[0021] The terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.
[0022] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.
[0023] The following is a description of preferred embodiments of the present invention in conjunction with the accompanying drawings.
[0024] See attached document Figure 1-4 This utility model discloses a centering adjustment fixture, including a base plate 1 and a chuck 2 fixed on the base plate 1. A support plate 3 is fixed on the base plate 1. Three sets of support plates 3 are evenly arranged in a ring around the chuck 2. A lifting block 30 is sleeved on the support plate 3. The lifting block 30 can slide up and down along the axis of the support plate 3.
[0025] Preferably, a T-slot 38 can be formed on the lifting block 30, and the T-slot 38 slides in engagement with the support plate 3. This allows the lifting block 30 to slide up and down along the axis of the support plate 3, and prevents it from moving forward, backward, left, or right or rotating, thereby enhancing stability.
[0026] The lower end face of the lifting block 30 is inclined, with an inclination angle designed within the range of 7°-15°. A movable block 31 is disposed below the lifting block 30. The upper end face of the movable block 31 is an inclined surface adapted to the lower end face of the lifting block 30. The movable block 31 is threadedly connected to the support plate 3. A fixing block 32 is disposed below the movable block 31 and is fixed to the support plate 3. The upper end face of the fixing block 32 abuts against the lower end face of the movable block 31.
[0027] As a further explanation of this embodiment, the solution also includes an adjusting bolt 33. Both the movable block 31 and the support plate 3 have threaded holes, and the adjusting bolt 33 can be threadedly connected to the threaded holes of the movable block 31 and the support plate 3. Specifically, the adjusting bolt 33 is first screwed into the radial threaded hole on the side of the movable block 31, passes through the threaded hole, and then is screwed into the threaded hole on the support plate 3.
[0028] The specific movement process is that the movable block 31 is driven to rise and fall along the axis of the support plate by the screw transmission. The upper end face of the movable block 31 abuts against the lower end face of the lifting block 30. Then the inclined wedge effect converts the axial displacement of the movable block 31 into the vertical displacement of the lifting block 30.
[0029] As a further explanation of this embodiment, the chuck 2 is a three-jaw chuck, which includes a disc body 21 fixed on the base plate 1. The disc body 21 is provided with three sets of slots 22 evenly arranged in a ring. Specifically, the upper end face of the disc body 21 has three radial slots evenly distributed in a ring along the circumference. The included angle between every two adjacent slots 22 is 120 degrees, which serves as a guide rail for the movement of the jaws.
[0030] A trapezoidal claw 23 is slidably disposed within the slot 22. The trapezoidal claw is embedded in the slot 22, forming an axially constrained radial sliding pair, allowing movement only along the direction of the slot 22. A first threaded tooth 24 is formed on the lower end face of the trapezoidal claw 23. The first threaded tooth 24 meshes with a second threaded tooth 25. The second threaded tooth 25 is formed on the upper end face of the first bevel gear 26. The first bevel gear 26 is rotatably mounted within the disc body 21. That is, the first bevel gear 26 is supported in the inner cavity of the disc body 21 by a plane bearing. The upper end face of the first bevel gear 26 is machined with the second threaded tooth 25. The first threaded tooth 24 and the second threaded tooth 25 directly mesh, converting the rotational motion of the first bevel gear 26 into the synchronous radial movement of the three trapezoidal claws 23.
[0031] As a further explanation of this embodiment, the lower end face of the first bevel gear 26 meshes with the second bevel gear 27. The first bevel gear 26 is a large bevel gear, and the second bevel gear 27 is a small bevel gear. The second bevel gear 27 is rotatably mounted inside the disk body 21, and three sets of the second bevel gear 27 are evenly arranged in a ring. Inside the disk body 21, the three sets of second bevel gears 27 are mounted on the same meshing circumference of the lower end face of the first bevel gear 26 in a 120° ring-shaped even distribution, forming a planetary meshing topology. The axis of each set of second bevel gears 27 is parallel to the axis of the disk body 21, and maintains a constant meshing angle with the bevel gear teeth on the lower end face of the first bevel gear 26.
[0032] As a further explanation of this embodiment, the end of the second bevel gear 27 has a square hole for inserting a wrench 4. One end of the wrench 4 is square and fits the square hole. A through hole is provided on the wrench 4, and a rotating rod 5 passes through the through hole. After the rotating rod 5 passes through the through hole, it forms a T-shaped lever, thereby rotating the second bevel gear 27.
[0033] As a further explanation of this embodiment, in order to prevent the second bevel gear 27 from moving back and forth, a limiting ring 28 can be machined around the outer circumference of the second bevel gear 27. A limiting rod 29 is provided inside the limiting ring 28, and the limiting rod 29 is fixed inside the disc body 21. The limiting rod 29 can prevent the second bevel gear 27 from moving back and forth without hindering the rotation of the second bevel gear 27 itself.
[0034] In use, first place the workpiece on the three sets of lifting blocks 30, rotate the adjusting bolt 33 so that the movable block 31 adjusts the height of the lifting block 30 through the inclined plate mechanism, and use a dial indicator to correct the end face to be horizontal; then insert the wrench 4 into the square hole of any second bevel gear 27, pass it through the rotating rod 5 to drive the three sets of synchronous bevel gear pairs, drive the first bevel gear 26 to rotate, and use the planar thread to make the three sets of trapezoidal claws 23 radially and synchronously clamp the inner circle of the workpiece; after clamping is completed, pull out the rotating rod 5 and the wrench 4.
[0035] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, multiple improvements and substitutions can be made without departing from the technical principles of the present utility model, and these improvements and substitutions should also be considered within the protection scope of the present utility model.
Claims
1. A centering adjustment fixture, comprising a base plate (1) and a chuck (2) fixed on the base plate (1), characterized in that, A support plate (3) is fixed on the base plate (1). A lifting block (30) is sleeved on the support plate (3). The lower end face of the lifting block (30) is an inclined surface. A movable block (31) is arranged below the lifting block (30). The upper end face of the movable block (31) is an inclined surface that matches the lower end face of the lifting block (30). The movable block (31) is threadedly connected to the support plate (3). A fixing block (32) is arranged below the movable block (31). The fixing block (32) is fixed on the support plate (3).
2. The centering and adjusting fixture as described in claim 1, characterized in that, It also includes an adjusting bolt (33), and both the movable block (31) and the support plate (3) are provided with threaded holes. The adjusting bolt (33) can be threadedly connected to the threaded holes provided in the movable block (31) and the support plate (3).
3. The centering and adjusting fixture as described in claim 2, characterized in that, The chuck (2) includes a disc body (21) fixed on the base plate (1). Three sets of slots (22) are evenly arranged in a ring on the disc body (21). A trapezoidal claw (23) is slidably arranged in the slot (22). A first threaded tooth (24) is opened on the lower end face of the trapezoidal claw (23). The first threaded tooth (24) meshes with a second threaded tooth (25). The second threaded tooth (25) is opened on the upper end face of a first bevel gear (26). The first bevel gear (26) is rotatably installed in the disc body (21).
4. The centering and adjusting fixture as described in claim 3, characterized in that, The lower end face of the first bevel gear (26) meshes with the second bevel gear (27), and the second bevel gear (27) is rotatably installed inside the disc body (21). The second bevel gear (27) is evenly arranged in three sets in a ring.
5. The centering and adjusting fixture as described in claim 4, characterized in that, The end of the second bevel gear (27) is provided with a square hole for inserting a wrench (4). One end of the wrench (4) is square and adapted to the square hole. A through hole is provided on the wrench (4), and a rotating rod (5) is inserted through the through hole.
6. The centering and adjusting fixture as described in claim 5, characterized in that, The second bevel gear (27) has a limiting ring (28) on its outer circumference. A limiting rod (29) slides inside the limiting ring (28) and is fixed inside the disc body (21).
7. The centering and adjusting fixture as described in claim 6, characterized in that, The lifting block (30) is provided with a T-slot (38), and the T-slot (38) slides with the support plate (3).
8. The centering and adjusting fixture as described in claim 7, characterized in that, The second bevel gear (27) is evenly arranged in three groups in a ring, and the axis of each group of second bevel gears (27) is parallel to the axis of the disc body (21).