Diameter-adjustable positioning clamp

Abstract

The utility model discloses a diameter-adjustable positioning fixture, which relates to the technical field of PVD (Physical Vapor Deposition) coating, and comprises a rotating base, a plurality of rotating cylinders are rotatably connected to the top end of the rotating base along the circumferential direction of the rotating base, gears are fixedly connected to the outer sides of the bottom ends of the rotating cylinders, the diameter-adjustable positioning fixture further comprises adjusting rings, and the adjusting rings are rotatably connected to the top ends of the rotating cylinders. A plurality of stepped grooves are formed in the inner wall of the adjusting ring in the circumferential direction of the adjusting ring; the elastic pieces are arranged on the inner side of the top end of the rotating cylinder in the circumferential direction of the rotating cylinder, one end of each elastic piece is fixedly connected with the rotating cylinder, and the other end of each elastic piece is supported by a stepped groove. The diameter-adjustable positioning clamp can be used for clamping and positioning a workpiece to be coated, so that the stability of the workpiece is improved; and meanwhile, the clamp is suitable for clamping workpieces with different diameters.

Description

Technical Field

[0001] The utility model relates to the technical field of PVD coating, in particular to a positioning fixture with adjustable diameter. Background Art

[0002] During the PVD coating process, the workpiece to be coated needs to be positioned to ensure that the coating can be accurately deposited at the predetermined position of the workpiece.

[0003] Current positioning devices for rod-shaped workpieces such as taps and drills typically utilize a turntable design with multiple rotating seats evenly distributed around its perimeter. A retaining cylinder is affixed to the top of each rotating seat, supporting the workpiece to be coated. Gears are mounted on the outside of the rotating seat and mesh with fixed racks or gears within the coating equipment. This allows each retaining cylinder to independently rotate while the turntable rotates, improving coating uniformity.

[0004] However, since the workpiece is only placed in the limiting cylinder, the diameter of the limiting cylinder is usually larger than the diameter of the tap, which causes the rotation and revolution of the limiting cylinder to cause the workpiece to shake during the coating process, affecting the coating effect; when the difference between the workpiece diameter and the inner diameter of the limiting cylinder is large, the swing phenomenon is more obvious, which requires the configuration of a limiting cylinder with a corresponding diameter according to the workpiece diameter, and has poor applicability.

[0005] Therefore, it is necessary to propose a positioning fixture with adjustable diameter to solve the above problems. Utility Model Content

[0006] (1) Technical problems solved

[0007] The purpose of the present utility model is to provide a positioning fixture with adjustable diameter to solve the problems raised in the above background technology.

[0008] (2) Technical solution

[0009] To achieve the above objectives, the present invention is implemented through the following technical solutions: a positioning fixture with adjustable diameter, comprising a rotating base, the top end of which is connected to a plurality of rotating cylinders for rotation along its circumferential direction, the bottom end of which is fixedly connected to the outer side of the rotating cylinder, and further comprising:

[0010] The adjusting ring is rotatably connected to the top of the rotating cylinder, and the inner wall of the adjusting ring is provided with a plurality of stepped grooves along its circumference;

[0011] The spring pieces are arranged on the inner side of the top end of the rotating cylinder along its circumference. One end of the spring piece is fixedly connected to the rotating cylinder, and the other end of the spring piece is supported by the stepped groove.

[0012] Preferably, the position of the spring piece corresponding to the stepped groove is in an inverted U shape.

[0013] Preferably, the steps of the stepped groove are provided with arc-shaped chamfers.

[0014] Preferably, an arc-shaped guide piece is provided on one side of the elastic piece close to the step of the step groove.

[0015] Preferably, one end of each of the plurality of spring pieces is fixedly connected to a positioning ring, and the positioning ring is fixedly connected to the rotating cylinder.

[0016] Preferably, a tapered groove is provided at the inner bottom end of the rotating cylinder.

[0017] Preferably, the top end of the rotating base is fixedly connected to a limiting ring, and the rotating cylinder passes through the limiting ring and is rotatably connected thereto.

[0018] (3) Beneficial effects

[0019] Compared with the prior art, the present invention provides a positioning fixture with adjustable diameter, which has the following beneficial effects:

[0020] 1. The diameter-adjustable positioning fixture clamps and positions the workpiece to be coated by setting springs, thereby preventing the workpiece to be coated from swinging during the rotation of the rotating cylinder and improving its stability.

[0021] 2. The diameter-adjustable positioning fixture is provided with an adjusting ring and a spring, and a stepped groove is opened on the inner side of the adjusting ring. The spring is supported by steps of different heights in the stepped groove to adjust the distance between the spring and the axis of the rotating cylinder. The workpiece to be coated is clamped and positioned by the spring, thereby improving its scope of application. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a three-dimensional schematic diagram of the structure of the utility model;

[0023] Figure 2 It is a cross-sectional schematic diagram of the rotating drum of the utility model;

[0024] Figure 3 It is a three-dimensional schematic diagram of the rotating drum of the utility model;

[0025] Figure 4 It is a top view schematic diagram of the rotating drum of the present invention.

[0026] In the figure: 1. Adjusting ring; 2. Limiting ring; 3. Rotating cylinder; 4. Gear; 5. Rotating base; 6. Step groove; 7. Spring piece; 8. Positioning ring; 9. Conical groove; 10. Arc guide piece; 11. Arc chamfer. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0028] See also Figure 1-4 As shown, a diameter-adjustable positioning fixture includes a rotating base 5, the top of which is rotatably connected to a plurality of rotating cylinders 3 along its circumference, a gear 4 fixedly connected to the outside of the bottom end of the rotating cylinder 3, an adjustment ring 1, and spring clips 7. The adjustment ring 1 is rotatably connected to the top of the rotating cylinder 3, and the inner wall of the adjustment ring 1 is provided with a plurality of stepped grooves 6 along its circumference; the inner side of the top of the rotating cylinder 3 is provided with a plurality of spring clips 7 along its circumference, one end of the spring clip 7 is fixedly connected to the rotating cylinder 3, and the other end of the spring clip 7 is supported by the stepped groove 6. Preferably, there are three spring clips 7 and three stepped grooves 6.

[0029] During use, one end of the workpiece to be coated is inserted into the rotating cylinder 3 , and the workpiece to be coated is clamped and positioned under the action of the three spring pieces 7 to prevent the workpiece from swinging in the rotating cylinder 3 during the coating process.

[0030] When the diameter of the workpiece to be coated is significantly different from the inner diameter of the rotating cylinder 3, resulting in the spring clip 7 being unable to clamp the workpiece to be coated, the adjusting ring 1 is rotated so that the spring clip 7 is supported by the higher or lower steps in the stepped groove 6, thereby reducing or increasing the distance between the spring clip 7 and the axis of the rotating cylinder 3 to meet the support requirements; by providing the spring clip 7, its scope of application is increased and its adjustment is convenient.

[0031] In order to ensure that the spring piece 7 has sufficient elastic force to clamp and position the workpiece, the position of the spring piece 7 corresponding to the stepped groove 6 is in an inverted U shape.

[0032] In some embodiments, to facilitate adjustment, the stepped groove 6 is provided with an arcuate chamfer 11 at the step; and the spring piece 7 is provided with an arcuate guide piece 10 on the side adjacent to the step of the stepped groove 6. The provision of the arcuate guide piece 10 and the arcuate chamfer 11, through their coordinated guidance, reduces adjustment resistance and facilitates adjustment.

[0033] In some embodiments, one end of each of the plurality of spring pieces 7 is fixedly connected to a positioning ring 8, and the positioning ring 8 is fixedly connected to the rotating drum 3. When installing the spring pieces 7, one end of the spring piece 7 is fixedly connected to the positioning ring 8, and then the positioning ring 8 is fixedly connected to the inner wall of the rotating drum 3, so that the installation is more convenient.

[0034] In order to prevent the workpiece to be coated from tilting, a tapered groove 9 is provided at the inner bottom end of the rotating cylinder 3. Under the guidance and limitation of the tapered groove 9, the end of the workpiece to be coated is located at the center of the rotating cylinder 3 to prevent its end from tilting.

[0035] To improve the stability of the rotating drum 3 during its rotation, the top of the rotating base 5 is fixedly connected to the limit ring 2. The rotating drum 3 passes through the limit ring 2 and is rotatably connected to it. With the limit support of the limit ring 2, the top of the rotating drum 3 is prevented from swinging, thereby improving its stability during rotation.

[0036] Although the 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 variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A positioning fixture with adjustable diameter, comprising a rotating base (5), the top end of the rotating base (5) being connected to a plurality of rotating cylinders (3) in a circumferentially rotatable manner, and the outer side of the bottom end of the rotating cylinder (3) being fixedly connected to a gear (4), characterized in that: Also includes: An adjusting ring (1), the adjusting ring (1) is rotatably connected to the top end of the rotating cylinder (3), and the inner wall of the adjusting ring (1) is provided with a plurality of stepped grooves (6) along its circumference; Shrapnel (7), a plurality of shrapnel (7) are arranged on the inner side of the top end of the rotating cylinder (3) along its circumference, one end of the shrapnel (7) is fixedly connected to the rotating cylinder (3), and the other end of the shrapnel (7) is supported by the stepped groove (6).

2. The diameter-adjustable positioning fixture according to claim 1, characterized in that: The position of the spring piece (7) corresponding to the stepped groove (6) is in an inverted U shape.

3. The diameter-adjustable positioning fixture according to claim 1, characterized in that: The stepped portion of the stepped groove (6) is provided with an arc-shaped chamfer (11).

4. The diameter-adjustable positioning fixture according to claim 1, characterized in that: An arc-shaped guide piece (10) is provided on one side of the spring piece (7) close to the step of the step groove (6).

5. The diameter-adjustable positioning fixture according to claim 1, characterized in that: One end of each of the plurality of spring pieces (7) is fixedly connected to a positioning ring (8), and the positioning ring (8) is fixedly connected to the rotating cylinder (3).

6. The diameter-adjustable positioning fixture according to claim 1, characterized in that: A conical groove (9) is provided at the inner bottom end of the rotating cylinder (3).

7. The diameter-adjustable positioning fixture according to claim 1, characterized in that: The top end of the rotating base (5) is fixedly connected to a limiting ring (2), and the rotating cylinder (3) passes through the limiting ring (2) and is rotatably connected thereto.

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