Clamp and test equipment

Abstract

The clamp is used for clamping an annular workpiece, the clamp comprises a base, a plurality of clamping jaw assemblies and a driving motor, the multiple clamping jaw assemblies are arranged on the base, and the multiple clamping jaw assemblies are evenly distributed in the axis direction of the base; the driving motor is fixed to the side, away from the clamping jaw assemblies, of the base, and the driving motor is used for driving the multiple clamping jaw assemblies to synchronously move outwards or inwards in the radial direction of the base so as to clamp or release the annular workpiece. The positioning precision of the annular workpiece can be improved, and deformation of the annular workpiece can be avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of workpiece detection, in particular to a clamp and a test device. BACKGROUND

[0002] In industrial production, annular workpieces are widely used, and their detection is crucial. The detection accuracy of annular workpieces is related to the accuracy of the clamp on the test device.

[0003] In the prior art, three separate air cylinders are generally used to drive the claws. Due to the air pressure fluctuations and response speed differences between different air cylinders, the movements of the three claws are prone to be out of sync, which directly leads to uneven force on the annular workpiece, resulting in positioning deviation of the annular workpiece, or even deformation of the annular workpiece. SUMMARY

[0004] To overcome the shortcomings of the prior art, the present application provides a clamp and a test device, which can improve the positioning accuracy of annular workpieces and avoid deformation of annular workpieces.

[0005] The present application is achieved by the following technical solutions:

[0006] A clamp for clamping an annular workpiece, comprising:

[0007] a base;

[0008] a plurality of claw assemblies, each of which is arranged on the base and uniformly distributed around the axial direction of the base;

[0009] a drive motor fixed to the side of the base away from the claw assemblies, which is used to drive the plurality of claw assemblies to move synchronously outward or inward along the radial direction of the base to clamp or release the annular workpiece.

[0010] Further, the claw assembly comprises a mounting bracket, a lead screw, a sliding block and a push block. The mounting bracket is fixed on the base, the lead screw is rotatably arranged on the mounting bracket, the sliding block is threadedly connected with the lead screw, and the push block is fixed on the sliding block to apply a pushing force along the radial direction of the annular workpiece inward or outward.

[0011] Further, the output shaft of the drive motor is fixed with a driving bevel gear, and the end of the lead screw close to the center of the base is fixed with a driven bevel gear, and the driving bevel gear and the driven bevel gear are meshed with each other.

[0012] Further, the pushing block comprises a pushing block body, and a first adjusting screw and a second adjusting screw threadedly connected with the pushing block body, the first adjusting screw and the second adjusting screw are located at opposite sides of the pushing block body, and the axial directions of the first adjusting screw and the second adjusting screw are respectively consistent with the axial direction of the screw rod;

[0013] When the pushing block is located at the inner side of the annular workpiece, the first adjusting screw abuts against the inner wall of the annular workpiece, and is used for applying a pushing force along the radial direction of the annular workpiece to the annular workpiece;

[0014] When the pushing block is located at the outer side of the annular workpiece, the second adjusting screw abuts against the outer wall of the annular workpiece, and is used for applying a pushing force along the radial direction of the annular workpiece to the annular workpiece.

[0015] Further, the mounting frame is fixed with a slide rail, a pair of slide rails are symmetrically distributed at two sides of the screw rod, a slide block is fixed on the side of the pushing block facing the mounting frame, a pair of slide blocks are correspondingly arranged with a pair of slide rails, and the slide block and the slide rail are in sliding connection.

[0016] Further, in the axial direction of the screw rod, the two ends of the mounting frame are respectively fixed with a first bearing and a second bearing, and the two axial ends of the screw rod are fixedly connected with the first bearing and the second bearing.

[0017] Further, the slide block comprises a slide block body and a mounting portion formed by the slide block body extending outward in the radial direction, and the mounting portion is fixed on the pushing block through a screw.

[0018] Further, a third bearing and a fourth bearing are further included, and the two axial ends of the output shaft are fixed on the base through the third bearing and the fourth bearing.

[0019] Further, a through hole is formed at the center of the base, the output shaft passes through the through hole, the driving bevel gear is at least partially located at the outer side of the through hole, and the tooth surface of the driving bevel gear is located above the base.

[0020] A test device comprises:

[0021] A clamp;

[0022] A first conveying platform for conveying the annular workpiece to be detected;

[0023] A detection assembly arranged above the clamp for detecting the annular workpiece;

[0024] A second conveying platform for conveying the annular workpiece after detection.

[0025] A clamping jaw assembly is arranged to clamp the annular workpiece on the first conveying platform to the clamp and clamp the annular workpiece on the clamp to the second conveying platform.

[0026] Compared with the prior art, the present application has the following advantages:

[0027] 1. By synchronously driving the plurality of clamping jaw assemblies around the base axis by the driving motor, the annular workpiece is evenly stressed in the circumferential direction, preventing local deformation caused by pressure, and ensuring quick and smooth clamping and releasing actions.

[0028] 2. By the first and second adjusting screws on the push block, the annular workpiece is adapted, and the center position of the annular workpiece is adjusted to provide coaxiality guarantee for subsequent processing or detection. In addition, the first and second adjusting screws are arranged on opposite sides of the push block body, which can clamp the annular workpiece from the inner side and the outer side, further expanding the diameter range of the clamped annular workpiece, and at the same time, the center position of the workpiece is adjusted to provide coaxiality guarantee for subsequent processing or detection. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 Fig. 1 is a structural schematic diagram of the clamp;

[0030] Figure 2 Fig. 2 is a partial structural schematic diagram of the clamp;

[0031] Figure 3 Fig. 3 is a sectional view of the clamp;

[0032] Figure 4 Fig. 4 is a structural schematic diagram of the test equipment.

[0033] 100, annular workpiece; 200, base; 210, through hole; 300, clamping jaw assembly; 310, mounting bracket; 320, screw rod; 330, sliding block; 331, sliding block body; 332, mounting portion; 340, push block; 341, push block body; 342, first adjusting screw; 343, second adjusting screw; 350, driven bevel gear; 360, sliding rail; 370, sliding block; 380, first bearing; 390, second bearing; 400, driving motor; 410, output shaft; 411, third bearing; 412, fourth bearing; 420, driving bevel gear; 500, first conveying platform; 600, detection assembly; 700, second conveying platform; 800, clamping jaw assembly. DETAILED DESCRIPTION

[0034] The following detailed, non-limiting description of the invention's technical solutions, in conjunction with preferred embodiments and accompanying drawings, is provided. In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the invention, and should not be construed as limiting the invention.

[0035] like Figure 1 As shown, a fixture according to an embodiment of the present invention is used to clamp a ring-shaped workpiece 100. In this embodiment, the ring-shaped workpiece 100 is a bearing ring, specifically an outer ring or an inner ring. This fixture is designed for clamping ring-shaped workpieces such as bearing rings, and can meet the stable fixing requirements of inner and outer rings of different specifications in bearing production. It provides a reliable positioning basis for subsequent processing, inspection and other processes, and avoids workpiece displacement from affecting accuracy.

[0036] like Figure 1 As shown, the fixture includes a base 200, multiple jaw assemblies 300, and a drive motor 400. The multiple jaw assemblies 300 are respectively disposed on the base 200 and are evenly distributed around the axis of the base 200. The drive motor 400 is fixed to the side of the base 200 away from the jaw assemblies 300. The drive motor 400 drives the multiple jaw assemblies 300 to move synchronously outward or inward along the radial direction of the base 200 to clamp or release the annular workpiece 100. The even distribution of the multiple jaw assemblies 300 ensures that the annular workpiece 100 is subjected to balanced force in its circumferential direction, preventing localized deformation due to pressure. The drive motor 400 is mounted on the back of the base 200, saving front space and avoiding interference with the loading and unloading of the annular workpiece 100. The synchronous drive design ensures that all jaw assemblies 300 move in unison, achieving fast and smooth clamping and release. In this embodiment, three jaw assemblies 300 are provided, and the three jaw assemblies 300 move synchronously under the drive of the drive motor 400.

[0037] The chuck assembly 300 includes a mounting bracket 310, a lead screw 320, a sliding block 330, and a pusher block 340. The mounting bracket 310 is fixed to the base 200. The lead screw 320 is rotatably mounted on the mounting bracket 310. The sliding block 330 is threadedly connected to the lead screw 320. The pusher block 340 is fixed to the sliding block 330 and is used to apply an inward or outward thrust along the radial direction of the annular workpiece 100. The mounting bracket 310 provides stable support for the lead screw 320, ensuring that it rotates without wobbling. At the same time, the threaded engagement between the lead screw 320 and the sliding block 330 converts the rotational motion into linear motion, resulting in high transmission accuracy and precise control of the displacement of the pusher block 340, thus meeting the clamping and positioning requirements of annular workpieces such as bearing rings.

[0038] The push block 340 includes a push block body 341 and a first adjusting screw 342 and a second adjusting screw 343 threadedly connected to the push block body 341. The first adjusting screw 342 and the second adjusting screw 343 are located on opposite sides of the push block body 341, and the axial directions of the first adjusting screw 342 and the second adjusting screw 343 are respectively aligned with the axial direction of the lead screw 320. When the push block 340 is located inside the annular workpiece 100, the first adjusting screw 342 abuts against the inner wall of the annular workpiece 100, applying an outward pushing force along the radial direction of the annular workpiece 100. When the push block 340 is located outside the annular workpiece 100, the second adjusting screw 343 abuts against the outer wall of the annular workpiece 100, applying an inward pushing force along the radial direction of the annular workpiece 100. In actual use, the adjusting screws can assist in adjusting the center position of the annular workpiece 100, paving the way for subsequent processing or inspection. For example, when performing quality inspection on a ring-shaped workpiece 100, if the center of the ring-shaped workpiece is not aligned with the axis of the inspection component above it, the center position of the ring-shaped workpiece 100 can be adjusted by adjusting the extension length of the screw.

[0039] Furthermore, the first adjusting screw 342 and the second adjusting screw 343, distributed on opposite sides of the pusher body 341, can further expand the diameter range of the ring-shaped workpiece 100 that can be clamped. Specifically, on the one hand, when the diameter of the ring-shaped workpiece 100 to be clamped is small, the ring-shaped workpiece 100 can be placed between multiple jaw assemblies 300. In this case, the pusher 340 is located on the outside of the ring-shaped workpiece 100, and the second adjusting screw 343 abuts against the outer wall of the ring-shaped workpiece 100 to apply an inward pushing force along the radial direction of the ring-shaped workpiece 100. The second adjusting screw 343 can also be adjusted by rotating its extension distance. When the pusher body 341 moves to its limit position, the second adjusting screw 343 can be rotated to further clamp the smaller diameter ring-shaped workpiece 100, further expanding the diameter range of the ring-shaped workpiece 100. The second adjusting screw 343 can also assist in adjusting the center position of the ring-shaped workpiece 100, realizing multiple uses of one component. On the other hand, when the diameter of the annular workpiece 100 to be clamped is large, the annular workpiece 100 can be placed on the outside of the multiple jaw assemblies 300. At this time, when the push block 340 is located inside the annular workpiece 100, the first adjusting screw 342 abuts against the inner wall of the annular workpiece 100 to apply an outward pushing force along the radial direction of the annular workpiece 100. The first adjusting screw 342 can also be adjusted by rotating its extension distance. When the push block body 341 moves to the limit position, the larger diameter annular workpiece 100 can be further clamped by rotating the first adjusting screw 342, further expanding the diameter range of the annular workpiece 100. The first adjusting screw 342 can also assist in adjusting the center position of the annular workpiece 100, realizing multiple uses of one component.

[0040] A slide rail 360 is fixed on the mounting bracket 310. A pair of slide rails 360 are symmetrically distributed on both sides of the lead screw 320. A slider 370 is fixed on the side of the push block 340 facing the mounting bracket 310. A pair of sliders 370 are correspondingly arranged with a pair of slide rails 360, and the sliders 370 are slidably connected to the slide rails 360. The cooperation between the slide rails 360 and the sliders 370 provides guidance for the push block 340, ensuring its radial linear movement, counteracting the lateral force that may be generated by the lead screw 320 transmission, and preventing the push block 340 from deviating. The symmetrical distribution design of the slide rails 360 ensures that the push block 340 is subjected to balanced force, reducing movement resistance and component wear, and extending service life.

[0041] Along the axial direction of the lead screw 320, a first bearing 380 and a second bearing 390 are fixed at both ends of the mounting bracket 310, respectively. The two ends of the lead screw 320 are fixedly connected to the first bearing 380 and the second bearing 390, respectively. The bearings convert the rotation of the lead screw 320 into low-friction rolling contact, reducing rotational resistance. At the same time, they provide end-to-end positioning for the lead screw 320, ensuring coaxiality during rotation and preventing the lead screw 320 from wobbling and affecting transmission accuracy.

[0042] The sliding block 330 includes a sliding block body 331 and a mounting portion 332 formed by extending the sliding block body 331 radially outward. The mounting portion 332 is fixed to the push block 340 by screws. The extended design of the mounting portion 332 enhances the connection rigidity between the sliding block 330 and the push block 340, reducing the deformation of the push block 340 under stress. The screw fixing method facilitates the disassembly and replacement of the push block 340, reducing maintenance costs and downtime.

[0043] A driving bevel gear 420 is fixed on the output shaft 410 of the drive motor 400, and a driven bevel gear 350 is fixed at the end of the lead screw 320 near the center of the base 200. The driving bevel gear 420 and the driven bevel gear 350 mesh with each other. The bevel gear transmission realizes the change of power direction and adapts to the spatial layout of the drive motor 400 and the lead screw 320. The driving bevel gear 420 simultaneously drives multiple driven bevel gears 350, ensuring that all lead screws 320 rotate synchronously, ensuring that the actions of each jaw assembly 300 are consistent, and achieving uniform clamping.

[0044] The fixture also includes a third bearing 411 and a fourth bearing 412. The two axial ends of the output shaft 410 are fixed to the base 200 by the third bearing 411 and the fourth bearing 412, respectively. The third and fourth bearings provide stable support for the output shaft 410, reduce radial runout during rotation, ensure stable meshing between the driving bevel gear 420 and the driven bevel gear 350, reduce gear wear, and extend the service life of the transmission system.

[0045] A through hole 210 is provided at the center of the base 200. The output shaft 410 passes through the through hole 210. The driving bevel gear 420 is at least partially located outside the through hole 210, and the tooth surface of the driving bevel gear 420 is located above the base 200. The through hole 210 provides installation space for the output shaft 410 and the driving bevel gear 420, making the structure more compact. The positioning of the driving bevel gear 420 ensures effective meshing with each driven bevel gear 350, guaranteeing reliable power transmission.

[0046] A testing device includes a fixture, a first conveying platform 500, a detection component 600, a second conveying platform 700, and a gripper assembly 800. The first conveying platform 500 is used to convey a ring-shaped workpiece 100 to be inspected. The detection component 600 is disposed above the fixture for inspecting the ring-shaped workpiece 100. The second conveying platform 700 is used to convey the ring-shaped workpiece 100 that has already been inspected. The gripper assembly 800 is used to grip the ring-shaped workpiece 100 on the first conveying platform 500 onto the fixture and to grip the ring-shaped workpiece 100 on the fixture onto the second conveying platform 700. The detection component 600 can be an ultrasonic probe or an industrial inspection camera, and it can be driven or positioned using a three-axis motion module. Similarly, the gripper assembly 800 can also be driven using a three-axis motion module. The components work together to automate the inspection of the ring-shaped workpiece 100. During operation, the first conveying platform 500 feeds the workpiece, the gripper assembly 800 transfers the workpiece, and the fixture precisely holds the ring-shaped workpiece 100 for inspection by the inspection assembly 600. After inspection, the workpiece is moved again by the gripper assembly 800 to the second conveying platform 700 for transport out, which greatly improves the inspection efficiency and reduces human error.

[0047] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A clamp for clamping a ring-shaped workpiece (100), characterized in that The clamp comprises: a base (200); a plurality of jaw assemblies (300) respectively arranged on the base (200), and the plurality of jaw assemblies (300) are uniformly distributed around the axis direction of the base (200); a driving motor (400) fixed to the side of the base (200) away from the jaw assemblies (300), the driving motor (400) is used to drive the plurality of jaw assemblies (300) to move synchronously outward or inward along the radial direction of the base (200) to clamp or release the annular workpiece (100).

2. The clamp of claim 1, wherein The jaw assembly (300) comprises a mounting frame (310), a lead screw (320), a sliding block (330) and a push block (340), the mounting frame (310) is fixed on the base (200), the lead screw (320) is rotatably arranged on the mounting frame (310), the sliding block (330) is threadedly connected with the lead screw (320), and the push block (340) is fixed on the sliding block (330) and used to apply a pushing force along the radial direction of the annular workpiece (100) inward or outward to the annular workpiece (100).

3. The clamp of claim 2, wherein The output shaft (410) of the driving motor (400) is fixed with a driving bevel gear (420), one end of the lead screw (320) close to the center of the base (200) is fixed with a driven bevel gear (350), and the driving bevel gear (420) and the driven bevel gear (350) are meshed with each other.

4. The clamp of claim 2, wherein The push block (340) comprises a push block body (341), a first adjusting screw (342) and a second adjusting screw (343) threadedly connected with the push block body (341), the first adjusting screw (342) and the second adjusting screw (343) are located on opposite sides of the push block body (341), and the axis directions of the first adjusting screw (342) and the second adjusting screw (343) are respectively consistent with the axis direction of the lead screw (320); When the push block (340) is located on the inner side of the annular workpiece (100), the first adjusting screw (342) abuts against the inner wall of the annular workpiece (100) and is used to apply a pushing force along the radial direction of the annular workpiece (100) outward to the annular workpiece (100); When the push block (340) is located on the outer side of the annular workpiece (100), the second adjusting screw (343) abuts against the outer wall of the annular workpiece (100) and is used to apply a pushing force along the radial direction of the annular workpiece (100) inward to the annular workpiece (100).

5. The clamp of claim 2, wherein The mounting frame (310) is fixed with a slide rail (360), a pair of slide rails (360) are symmetrically distributed on the two sides of the lead screw (320), the side of the push block (340) facing the mounting frame (310) is fixed with a sliding block (370), a pair of sliding blocks (370) are correspondingly arranged with a pair of slide rails (360), and the sliding block (370) is slidably connected with the slide rail (360).

6. The clamp of claim 2, wherein The mounting frame (310) is fixed with a first bearing (380) and a second bearing (390) at two ends in the axial direction of the lead screw (320), and the axial ends of the lead screw (320) are fixedly connected with the first bearing (380) and the second bearing (390) respectively.

7. The clamp of claim 2, wherein The sliding block (330) comprises a sliding block body (331) and a mounting portion (332) extending outwardly from the sliding block body (331) in a radial direction, and the mounting portion (332) is fixed on the push block (340) by a screw.

8. The clamp of claim 3, wherein The output shaft (410) is fixed on the base (200) by a third bearing (411) and a fourth bearing (412) at two axial ends.

9. The clamp of claim 3, wherein The base (200) is provided with a through hole (210) at the center, the output shaft (410) passes through the through hole (210), the driving bevel gear (420) is at least partially located outside the through hole (210), and the tooth surface of the driving bevel gear (420) is located above the base (200).

10. A test apparatus, characterized by, Comprise: The clamp of any one of claims 1-9; A first conveying platform (500) for conveying the annular workpiece (100) to be detected; A detection assembly (600) arranged above the clamp for detecting the annular workpiece (100); A second conveying platform (700) for conveying the annular workpiece (100) after detection; A clamping jaw assembly (800) for clamping the annular workpiece (100) on the first conveying platform (500) to the clamp and clamping the annular workpiece (100) on the clamp to the second conveying platform (700).

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