A method for detecting a crack in an elongated magnet

Abstract

The application provides a long strip magnet crack detection method, and relates to a long strip magnet crack detection device, which comprises a detection mechanism and an optical amplification platform; the method comprises the following steps: S1: a plurality of long strip magnets are placed in a fence, a shaking object table assembly is made to fall into a positioning groove of a limiting plate, the fence is removed, and the excess long strip magnets are poured out; S2: a linkage plate is horizontally displaced, a small connecting rod synchronously drives a pressing jaw to abut against and oppositely extrude two ends of the long strip magnet, and the long strip magnet is arched to produce bending deformation in an arc-shaped groove; S3: a curved surface bump of an upper cover plate is used to observe the upper surface of the long strip magnet, and the angle of a convex mirror is adjusted, the image of the lower surface of the long strip magnet is reflected and amplified through a plane mirror; S4: a limiting jaw is actuated to release the limiting of the linkage plate, the linkage plate is reset under the action of a tension spring, the pressing jaw releases the abutment extrusion of the two ends of the long strip magnet, and the detected magnet is taken off. The application can improve the detection efficiency and ensure the product quality.

Description

Technical Field

[0001] This invention relates to the field of magnet processing technology, and in particular to a method for detecting cracks in long strip magnets. Background Technology

[0002] During the production of bar magnets, surface cracks and other defects can occur, severely affecting product quality. Therefore, surface inspection of bar magnets is necessary. However, bar magnets used in 3C electronic products such as mobile phones, computers, and tablets are generally small in size, making it difficult to detect surface defects. This can easily lead to products with surface cracks and other defects being mixed in with qualified products.

[0003] To ensure product quality, inspectors need to determine whether the long magnets have defects such as cracks. Existing inspection methods mainly rely on manual inspection, which is difficult for the human eye to visually detect, such as minute cracks on the product surface. It is also prone to missed detections, which is time-consuming, labor-intensive, and inefficient, and has a certain impact on production. Summary of the Invention

[0004] The purpose of this invention is to provide a method for detecting cracks in long magnetic strips, so as to solve the problems of low efficiency, easy omission, and difficulty in detecting minute cracks in the existing technology of manual inspection.

[0005] To achieve the above objectives, the solution of the present invention is as follows: A method for detecting cracks in a long strip magnet, and a device for detecting cracks in a long strip magnet, the device including a detection mechanism and an optical magnification platform; The testing equipment includes a transparent stage assembly, a linkage clamping assembly, a limit reset assembly, and a detachable enclosure. The stage assembly is composed of an upper cover plate, a limiting plate and a bottom plate stacked together. The bottom surface of the upper cover plate is provided with an arc-shaped groove for the long magnet to bend and deform. The top surface of the upper cover plate is provided with a curved protrusion at the position corresponding to the arc-shaped groove. The limiting plate is provided with a positioning groove to accommodate the long magnet. The linkage clamping assembly includes a linkage plate slidably disposed on the bottom plate, multiple small connecting rods and pressure claws. The two ends of the small connecting rods are respectively hinged to the linkage plate and the pressure claws. The position of the pressure claws corresponds to the position of the positioning groove. The linkage plate is provided with ratchet teeth. The limit reset assembly includes a limit pawl that engages with a ratchet and a tension spring for resetting the linkage plate; The enclosure is set around the platform assembly; The optical magnification platform includes a convex mirror and a plane mirror located below the stage assembly. The rotation angle of the convex mirror is adjustable, and the plane mirror is positioned on the projection path of the convex mirror. The detection method includes the following steps: S1: Place multiple long magnets inside the enclosure, shake the platform assembly to make the long magnets fall into the positioning slots of the limiting plate, remove the enclosure and pour out the excess long magnets. S2: Push the linkage plate to move horizontally, and drive the pressure claws to press against and squeeze the two ends of the long magnet in opposite directions through the small connecting rod, so that the long magnet arches in the arc groove and produces bending deformation, so as to open the surface micro cracks by using bending stress. S3: Observe the upper surface of the long bar magnet through the curved protrusions on the upper cover plate, and at the same time adjust the angle of the convex mirror to reflect and magnify the image of the lower surface of the long bar magnet through the plane mirror for visual inspection. S4: Move the limit pawl to release the limit on the linkage plate, and the linkage plate will be reset under the action of the tension spring. The pressure pawl will release the pressure on both ends of the long magnet, and the magnet after testing can be removed.

[0006] In a preferred embodiment, the upper cover plate, the limiting plate, and the bottom plate are connected by a wedge-shaped protrusion and a wedge-shaped groove to achieve rapid positioning and installation.

[0007] In a preferred embodiment, the upper cover plate, the limiting plate, and the bottom plate are all provided with positioning slots.

[0008] In a preferred embodiment, the side of the enclosure is provided with a tipping opening.

[0009] A preferred embodiment also includes a profile frame, with the testing mechanism positioned above the profile frame and the optical magnification platform positioned in the middle of the profile frame.

[0010] In a preferred embodiment, the optical magnification platform further includes a connecting shaft and a hand-cranked wheel. The connecting shaft is rotatably mounted in the middle of the profile frame, and the hand-cranked wheel is connected to one end of the connecting shaft via a transmission connection. The convex mirror is fixedly mounted on the connecting shaft.

[0011] In a preferred embodiment, a pallet claw is also included, which is disposed on the top of the profile frame, and the detection mechanism is placed on the pallet claw.

[0012] In a preferred embodiment, the sliding direction of the linkage plate is perpendicular to the length direction of the bar magnet.

[0013] After adopting the above solution, the beneficial effects of the present invention are as follows: 1. The present invention can more clearly display the cracks and defects on the surface of the long magnet by using the curved protrusions (convex light-transmitting structure) on the upper cover plate. At the same time, a convex mirror and a plane mirror are placed under the stage. By adjusting the angle of the convex mirror, the subtle defects under the long magnet can be magnified and observed, so as to achieve comprehensive inspection and ensure product quality.

[0014] 2. In this invention, the linkage plate can drive multiple pressure claws to clamp the two ends of the long bar magnet at one time, causing the long bar magnet to bend and deform, making the cracks on its surface stand out. This enables multiple products to be inspected quickly at one time, greatly improving the inspection efficiency, reducing the labor intensity of inspection personnel, and improving production efficiency. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of the detection device in an embodiment of the present invention; Figure 2 This is a schematic diagram of the detection mechanism being removed from above the profile frame in an embodiment of the present invention; Figure 3 This is a partial exploded structural diagram of the detection mechanism in an embodiment of the present invention; Figure 4 This is a schematic diagram of the embodiment of the present invention, in which the upper cover plate and the limiting plate are removed from the bottom plate and the pressure claws abut against and clamp the two ends of the long strip magnet; Figure 5 This is a schematic diagram of the pressure claw being connected to the linkage plate via a small connecting rod in an embodiment of the present invention; Figure 6 This is a bottom view of the upper cover plate in an embodiment of the present invention.

[0016] Label Explanation: 1. Top cover plate; 2. Limiting plate; 3. Bottom plate; 4. Linkage plate; 5. Enclosure; 6. Small connecting rod; 7. Pressure claw; 8. Limiting claw; 9. Tension spring; 10. Convex mirror; 11. Plane reflector; 12. Wedge-shaped protrusion; 13. Wedge-shaped groove; 14. Positioning slot; 15. Tilting port; 16. Profile frame; 17. Connecting shaft; 18. Hand crank wheel; 19. Pallet claw; 20. Curved protrusion; 21. Arc-shaped groove; 22. Horizontal plate; 23. Vertical plate; 24. Clamping space; 25. Ratchet; 26. Long bar magnet; 27. Positioning slot. Detailed Implementation

[0017] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0018] This embodiment provides a method for detecting cracks in a long strip magnet, and relates to a device for detecting cracks in a long strip magnet, such as... Figures 1 to 6 As shown, the detection device includes a detection mechanism and an optical magnification platform.

[0019] The testing equipment includes a transparent stage assembly, a linkage clamping assembly, a limit reset assembly, and a detachable enclosure 5.

[0020] The stage assembly is composed of an upper cover plate 1, a limiting plate 2, and a bottom plate 3 stacked together. The upper cover plate 1, limiting plate 2, and bottom plate 3 are all made of transparent material for easy observation by inspectors. The bottom surface of the upper cover plate 1 has an arc-shaped groove 21 for the bending deformation of the elongated magnet 26, such as... Figure 6 As shown, the top surface of the upper cover plate 1 has a curved protrusion 20 at the position corresponding to the arc-shaped groove 21, such as... Figure 3 As shown, the principle of light transmission allows operators to more easily detect defects on the product surface. The limiting plate 2 is provided with a positioning groove 27 to accommodate the long magnet 26.

[0021] like Figure 3 and Figure 4 As shown, the upper cover plate 1, the limiting plate 2, and the bottom plate 3 are all provided with circular positioning slots 14 for positioning. The upper cover plate 1, the limiting plate 2, and the bottom plate 3 are connected by wedge-shaped protrusions 12 and wedge-shaped grooves 13 to achieve rapid positioning and installation. Specifically, the upper cover plate 1 has wedge-shaped protrusions 12, and the limiting plate 2 and the bottom plate 3 have corresponding wedge-shaped grooves 13 of appropriate size at corresponding positions. This allows the upper cover plate 1 to be quickly positioned and installed, and also provides a certain degree of constraint to prevent the long magnet 26 from shifting.

[0022] The linkage clamping assembly includes a linkage plate 4 slidably mounted on the bottom plate 3, multiple small connecting rods 6, and pressure claws 7. Specifically, the linkage plate 4 consists of a horizontal plate 22 and vertical plates 23. Multiple vertical plates 23 are fixedly connected to the horizontal plate 22, forming a fork-like structure, such as... Figure 4 and Figure 5 As shown, a clamping space 24 for the long magnet 26 is formed between adjacent longitudinal plates 23. The two ends of the small connecting rod 6 are respectively hinged to the linkage plate 4 and the pressure claw 7. That is, one end of the pressure claw 7 is hinged to the bottom plate 3 and located in the clamping space 24. One end of the small connecting rod 6 is hinged to the longitudinal plate 23, and the other end is hinged to the other end of the pressure claw 7, allowing the longitudinal plate 23 to rotate via the small connecting rod 6 when sliding. The sliding direction of the linkage plate 4 is perpendicular to the length direction of the long magnet 26, meaning the linkage plate 4 slides horizontally on the bottom plate 3. The small connecting rod 6 causes the pressure claw 7 to abut against and press against both ends of the long magnet 26, causing the long magnet 26 to undergo a slight vertical bending deformation relative to the bottom plate 3. The bending curvature of the long magnet 26 is controlled within an elastic deformation range that will not cause the long magnet 26 to break.

[0023] The position of the pressure claw 7 corresponds to the position of the positioning groove 27. The linkage plate 4 is provided with a unidirectional ratchet 25. The limit and reset assembly includes a limit claw 8 that cooperates with the ratchet 25 and a tension spring 9 for resetting the linkage plate 4. By cooperating with the limit claw 8, the linkage plate 4 can only move in one direction when it does not touch the limit claw 8. The limit claw 8 and the tension spring 9 work together to achieve a backlash prevention effect. After the inspection is completed, the limit claw 8 is moved, and the linkage plate 4 returns to its initial position under the action of the tension spring 9, which facilitates the inspection of the next batch of products. The enclosure 5 is set around the platform assembly. The side of the enclosure 5 has a tilting port 15 to facilitate the emptying of excess long magnets 26 during loading.

[0024] Specifically, such as Figure 1 and Figure 2 As shown, it also includes a profile frame 16, which can be an aluminum profile frame 16. The detection mechanism is set above the profile frame 16, and the optical magnification platform is set in the middle of the profile frame 16. The top of the profile frame 16 is provided with a tray claw 19 for placing the detection mechanism. In use, the tray claw 19 contacts the bottom plate 3 to provide support and facilitate the placement and removal of the entire detection mechanism.

[0025] The optical magnification platform includes a convex mirror 10 and a plane mirror 11 disposed below the stage assembly. The rotation angle of the convex mirror 10 is adjustable, and the plane mirror 11 is disposed on the projection path of the convex mirror 10.

[0026] The optical magnification platform also includes a connecting shaft 17 and a hand-cranked wheel 18. The connecting shaft 17 is rotatably mounted in the middle of the profile frame 16, and the hand-cranked wheel 18 is connected to one end of the connecting shaft 17. The convex mirror 10 is fixedly mounted on the connecting shaft 17. By rotating the hand-cranked wheel 18, the convex mirror 10 is driven to rotate, reflecting the magnified image of the bottom surface through the inclined plane mirror to the inspector's eye. This allows the inspector to more easily observe the back of the product, and the convex mirror 10 has a magnifying effect, making it easier for the inspector to observe defects on the back of the product.

[0027] The detection method in this embodiment includes the following steps: S1: Install the limiting plate 2, bottom plate 3, small connecting rod 6, pressure claw 7, linkage plate 4, limiting claw 8, and tension spring 9 in the correct positions, and then install the enclosure 5. Place multiple long magnets 26 inside the enclosure 5, shake the platform assembly to make the long magnets 26 fall into the positioning groove 27 of the limiting plate 2, remove the enclosure 5 and pour out the excess long magnets 26 through the tilting port 15 on the side of the enclosure 5. Insert the top cover plate 1 into the wedge groove 13 of the limiting plate 2 and the bottom plate 3 through the wedge protrusion 12 to achieve quick positioning.

[0028] S2: The linkage plate 4 is pushed to a horizontal position, which simultaneously drives the pressure claws 7 to press against and squeeze the two ends of the long magnet 26 through the small connecting rod 6. This causes the long magnet 26 to arch and bend within the arc-shaped groove 21, thereby utilizing the bending stress to open the surface micro-cracks. The arc-shaped groove 21 at the top cover plate 1 provides space for the long magnet 26 to bend upwards. The linkage plate 4 is equipped with unidirectional ratchet 25, which, together with the limiting claw 8, can limit excessive displacement of the linkage plate 4, ensuring the smooth progress of the inspection process.

[0029] S3: Observe the upper surface of the long bar magnet 26 through the curved protrusion 20 of the upper cover plate 1, and at the same time adjust the angle of the convex mirror 10 to reflect and magnify the image of the lower surface of the long bar magnet 26 through the plane mirror 11 for visual inspection.

[0030] S4: After the test is completed, move the limiting claw 8 to release the limiting of the linkage plate 4. Under the action of the tension spring 9, the linkage plate 4 is reset. The pressing claw 7 releases the pressure on both ends of the long magnet 26. Remove the tested magnet and the next batch of long magnets 26 can be tested.

[0031] The directional terms used in this specification are defined relative to the structures shown in the accompanying drawings. They are relative concepts and may therefore vary depending on their location and usage. Therefore, these or other directional terms should not be interpreted as restrictive.

[0032] The above description is only a preferred embodiment of the present invention and is not intended to limit the design of this case. All equivalent changes made based on the key design features of this case shall fall within the protection scope of this case.

Claims

1. A method for detecting cracks in a long strip magnet, characterized in that: The invention relates to a crack detection device for a long strip magnet, the device comprising a detection mechanism and an optical magnification platform; The testing equipment includes a transparent stage assembly, a linkage clamping assembly, a limit reset assembly, and a detachable enclosure. The stage assembly is composed of an upper cover plate, a limiting plate and a bottom plate stacked together. The bottom surface of the upper cover plate is provided with an arc-shaped groove for the long magnet to bend and deform. The top surface of the upper cover plate is provided with a curved protrusion at the position corresponding to the arc-shaped groove. The limiting plate is provided with a positioning groove to accommodate the long magnet. The linkage clamping assembly includes a linkage plate slidably disposed on the bottom plate, multiple small connecting rods and pressure claws. The two ends of the small connecting rods are respectively hinged to the linkage plate and the pressure claws. The position of the pressure claws corresponds to the position of the positioning groove. The linkage plate is provided with ratchet teeth. The sliding direction of the linkage plate is perpendicular to the length direction of the bar magnet. The limit reset assembly includes a limit pawl that engages with a ratchet and a tension spring for resetting the linkage plate; The enclosure is set around the platform assembly; The optical magnification platform includes a convex mirror and a plane mirror located below the stage assembly. The rotation angle of the convex mirror is adjustable, and the plane mirror is positioned on the projection path of the convex mirror. The detection method includes the following steps: S1: Place multiple long magnets inside the enclosure, shake the platform assembly to make the long magnets fall into the positioning slots of the limiting plate, remove the enclosure and pour out the excess long magnets. S2: Push the linkage plate to move horizontally, and drive the pressure claws to press against and squeeze the two ends of the long magnet in opposite directions through the small connecting rod, so that the long magnet arches in the arc groove and produces bending deformation. The bending curvature of the bending deformation is controlled within the elastic deformation range that does not cause the long magnet to break, so as to use the bending stress to open the surface micro-cracks. S3: Observe the upper surface of the long bar magnet through the curved protrusions on the upper cover plate, and at the same time adjust the angle of the convex mirror to reflect and magnify the image of the lower surface of the long bar magnet through the plane mirror for visual inspection. S4: Move the limit pawl to release the limit on the linkage plate, and the linkage plate will be reset under the action of the tension spring. The pressure pawl will release the pressure on both ends of the long magnet, and the magnet after testing can be removed.

2. The method for detecting cracks in a long strip magnet as described in claim 1, characterized in that: The upper cover plate, the limiting plate, and the bottom plate are connected by wedge-shaped protrusions and wedge-shaped grooves to achieve rapid positioning and installation.

3. The method for detecting cracks in a long strip magnet as described in claim 1, characterized in that: The top cover plate, the limiting plate, and the bottom plate are all provided with positioning slots.

4. The method for detecting cracks in a long strip magnet as described in claim 1, characterized in that: The fence has a tilting opening on its side.

5. The method for detecting cracks in a long strip magnet as described in claim 1, characterized in that: It also includes a profile frame, with the testing mechanism located above the profile frame and the optical magnification platform located in the middle of the profile frame.

6. The method for detecting cracks in a long strip magnet as described in claim 5, characterized in that: The optical magnification platform also includes a connecting shaft and a hand-cranked wheel. The connecting shaft is rotatably located in the middle of the profile frame, and the hand-cranked wheel is connected to one end of the connecting shaft. The convex mirror is fixedly mounted on the connecting shaft.

7. The method for detecting cracks in a long strip magnet as described in claim 5, characterized in that: It also includes a pallet claw, which is set on the top of the profile frame, and the detection mechanism is placed on the pallet claw.

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