Automatic visual inspection device for neodymium-iron-boron magnet finished product

Abstract

The invention relates to the technical field of neodymium-iron-boron magnet production, in particular to an automatic visual inspection device for neodymium-iron-boron magnet finished products. The device comprises a detection table, a cover body, a first industrial camera, an electric slide rail, a pick-and-place mechanism and the like, a cover body is assembled above the detection table, a first industrial camera is obliquely installed on the upper left portion of the cover body, electric sliding rails are symmetrically installed on the front side and the rear side of the cover body, a taking and placing mechanism used for taking and placing the neodymium-iron-boron magnet finished product is installed between the moving ends of the electric sliding rails, and the neodymium-iron-boron magnet finished product detection device further comprises a bottom face shooting assembly used for shooting and image taking of the bottom face of the neodymium-iron-boron magnet finished product. The first industrial camera and the second industrial camera are used for jointly shooting the side faces, the top face and the bottom face of the neodymium-iron-boron magnet so as to obtain the complete appearance image of the neodymium-iron-boron magnet finished product, analysis software is combined for automatically recognizing defects, and the effect of comprehensively detecting the neodymium-iron-boron magnet finished product is achieved.

Description

Technical Field

[0001] This device relates to the field of neodymium iron boron magnet production technology, and in particular to an automatic visual inspection device for finished neodymium iron boron magnets. Background Technology

[0002] Neodymium iron boron (NdFeB) magnets are currently the strongest permanent magnet materials, with Nd₂Fe as their main phase. 14 Neodymium iron boron (NdFeB) magnets are primarily composed of neodymium, iron, and boron, with small amounts of dysprosium, terbium, and niobium added. Due to their small size and high magnetic flux, they have replaced traditional magnets and are widely used in hard drive VCMs, mobile phone micro-motors, electric vehicle drive motors, wind turbines, MRI machines, magnetic separators, and consumer electronics, becoming a key functional material in energy-saving and automation industries. Industrially, they are manufactured into various shapes using powder metallurgy (sintering) or rapid quenching-bonding processes, with surfaces requiring nickel or zinc plating or epoxy resin coating for protection. Surface defects are often weak points and sources of failure in the protective coating; variations in coating thickness at these locations significantly affect key properties such as coating / substrate adhesion and coating stress. Therefore, surface defect detection of NdFeB magnets is essential.

[0003] Chinese Patent CN222618523U discloses a surface defect detection device for NdFeB production. Key technical features include a workbench with an entry guide bar on one side of the top for vertical entry of annular NdFeB rings. A vertical limiting conveying device for the annular NdFeB rings is located on the workbench at the exit of the entry guide bar. An internal surface defect detection device for detecting internal surface defects of the annular NdFeB rings on the limiting conveying device is located on the top of the workbench next to the limiting conveying device. This application detects defects on the inner surface of the annular NdFeB rings. When a vision inspection instrument detects a defect on the inner surface, it sends a signal to a controller. The controller receives and processes the signal and activates an alarm to alert the inspector. This streamlined conveying and detection method ensures high efficiency, guarantees the performance and reliability of NdFeB products, and reduces the risk of malfunctions or damage during use. However, when performing visual inspection of NdFeB, this device is limited to rotating and inspecting the inner surface of NdFeB, and the inspection surface cannot cover all surfaces of NdFeB, making it difficult to guarantee the accuracy of NdFeB inspection. Summary of the Invention

[0004] To overcome the shortcomings of existing visual inspection equipment for NdFeB magnets, which is difficult to perform comprehensive inspection of NdFeB products and has low inspection accuracy, this invention provides an automatic visual inspection device for finished NdFeB magnets.

[0005] The technical solution is as follows: An automatic visual inspection device for finished neodymium iron boron magnets includes a base frame, an inspection table, a cover, and a first industrial camera. The inspection table is installed on the upper part of the base frame, and the cover is mounted on top of the inspection table. The first industrial camera is installed obliquely on the upper left part of the cover, and the shooting range of the first industrial camera covers the entire upper surface of the inspection table. The device also includes an electric slide rail, a pick-and-place mechanism, a bottom surface shooting component, a rotating mechanism, and a conveying mechanism. Electric slide rails are symmetrically installed on the front and rear sides of the cover. A pick-and-place mechanism for picking up and placing finished neodymium iron boron magnets is installed between the moving ends of the electric slide rails. A bottom surface shooting component for shooting images of the bottom surface of the finished neodymium iron boron magnets is installed on the right side inside the base frame. A rotating mechanism for rotating the finished neodymium iron boron magnets is installed on the inspection table, and a conveying mechanism for conveying the finished neodymium iron boron magnets is installed in the middle of the inspection table.

[0006] Preferably, the bottom imaging component includes a second industrial camera, which is mounted on the right side of the inner wall of the bottom frame via a mounting bracket, and an observation slot is provided on the right side of the inspection table, which is located directly above the second industrial camera.

[0007] Preferably, the picking and placing mechanism includes a movable frame, a cylinder, a suction cup frame, and a vacuum suction cup. The movable frame is connected between the moving ends of the front and rear electric slide rails. The cylinder is mounted on the movable frame, and the extension end of the cylinder is connected to the suction cup frame. The vacuum suction cup is set on the suction cup frame, and the vacuum suction cup is provided with a vacuum source by a vacuum pump.

[0008] Preferably, the rotating mechanism includes a first motor, a first gear, a gear ring, and a turntable. The turntable is rotatably mounted on the testing platform, and a gear ring is connected to the outer circumference of the turntable. The first motor is installed on the right side of the testing platform, and the output shaft of the first motor is connected to the first gear, which meshes with the gear ring.

[0009] Preferably, the conveying mechanism includes a first conveyor belt, a second conveyor belt, an electric push rod, a push plate, and a transition plate. The first and second conveyor belts are mounted side by side on the bottom frame via brackets. The first conveyor belt passes through the front and rear side walls of the cover. An electric push rod is mounted on the side wall of the bottom frame via brackets. The telescopic end of the electric push rod is connected to the push plate. A transition plate is mounted on the side wall of the bottom frame via brackets. The transition plate is located between the first and second conveyor belts.

[0010] Preferably, the device further includes a correction mechanism, which comprises a positioning frame, a guide rod, a correction rod, an internal gear ring, a second gear, a rubber sleeve, a second motor, a worm gear, and a spring. The guide rod is slidably connected to the suction cup frame, and a spring connects the guide rod to the suction cup frame. The lower end of the guide rod is connected to the positioning frame, which has a number of slots evenly distributed to match the number of turntables. The correction rods are evenly rotatably arranged on the circumference of the slots. A second gear is installed at the pivot of each correction rod. An internal gear ring is rotatably arranged on the outer circumference of the slots. A second motor is installed on the positioning frame, and the output shaft of the second motor is connected to the worm gear. A worm wheel groove that meshes with the worm gear is provided on the outer circumference of the internal gear ring. The internal gear ring meshes with the second gear, and a rubber sleeve is installed at the end of the correction rod.

[0011] Preferably, an inspection door is installed on the left side of the enclosure, and the inspection door is equipped with a handle.

[0012] Preferably, transparent windows are installed on the front, back, and right sides of the cover.

[0013] Compared with the prior art, the present invention has the following advantages: By setting up a first industrial camera and a second industrial camera, the present invention can capture images of the side, top and bottom surfaces of the neodymium iron boron magnet product to be inspected in real time, so that the top surface, bottom surface and continuously rotating side surface of the neodymium iron boron magnet product can be observed simultaneously. This allows for continuous monitoring and recording of the appearance image of the neodymium iron boron magnet product, and the appearance defects can be automatically identified by the analysis and detection system, thereby improving the comprehensiveness and accuracy of the detection. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0015] Figure 2 This is a schematic diagram of the structure of the testing platform, electric slide rail, first conveyor belt, and other components of the present invention.

[0016] Figure 3 This is a schematic diagram of the structure of the first motor, turntable, and observation slot of the present invention.

[0017] Figure 4 This is a schematic diagram of the installation of the second industrial camera of the present invention.

[0018] Figure 5 This is a schematic diagram of the structure of the positioning frame, guide rod, and second motor of the present invention.

[0019] Figure 6 This is a schematic diagram of the structure of the cylinder, suction cup frame, and vacuum suction cup of the present invention.

[0020] Figure 7 This is a schematic diagram of the structure of the corrective rod, internal gear ring, and second gear of the present invention.

[0021] Figure 8 This is a structural schematic diagram of the first transmission belt, cover, and inspection door components of the present invention.

[0022] In the diagram: 1. Base frame, 2. Inspection table, 3. First industrial camera, 4. First conveyor belt, 5. Cover, 6. Inspection door, 7. Transparent window, 8. Electric slide rail, 9. Moving frame, 101. Second industrial camera, 201. Cylinder, 202. Suction cup frame, 203. Vacuum suction cup, 301. First motor, 302. First gear, 303. Gear ring, 304. Turntable, 305. Observation slot, 401. Positioning frame, 402. Guide rod, 403. Correction rod, 404. Internal gear ring, 405. Second gear, 406. Rubber sleeve, 407. Second motor, 408. Worm gear, 409. Spring, 601. Second conveyor belt, 602. Electric push rod, 603. Push plate, 604. Transition plate, 100. Neodymium iron boron magnet finished product. Detailed Implementation

[0023] Although the invention may be described with respect to specific applications or industries, those skilled in the art will recognize its broader applicability. Those skilled in the art will understand that terms such as "above," "below," "upward," "downward," etc., are used to describe the drawings and not to indicate a limitation on the scope of the invention as defined by the appended claims. Any numerical designations such as "first" or "second" are merely illustrative and not intended to limit the scope of the invention in any way.

[0024] Example 1: As Figures 1-8As shown, an automatic visual inspection device for neodymium iron boron magnet finished products includes a base frame 1, an inspection table 2, a cover 5, and a first industrial camera 3. The inspection table 2 is mounted on the upper part of the base frame 1, and the cover 5 is mounted on top of the inspection table 2. The first industrial camera 3 is obliquely mounted on the upper left part of the cover 5. The first industrial camera 3 is used to simultaneously capture images (including videos and photos) of the top and side surfaces of the neodymium iron boron magnet finished product 100. The shooting range of the first industrial camera 3 covers the entire upper surface of the inspection table 2. The device also includes an electric slide rail 8, a pick-and-place mechanism, and a bottom surface shooting group. The device includes a component, a rotating mechanism, and a conveying mechanism. The actions of each mechanism are controlled by the controller of the detection device. Electric slide rails 8 are symmetrically installed on the front and rear sides of the cover 5. A pick-and-place mechanism for picking up and placing neodymium iron boron magnet finished product 100 is installed between the moving ends of the electric slide rails 8. A bottom imaging component for taking pictures of the bottom surface of neodymium iron boron magnet finished product 100 is installed on the right side of the bottom frame 1. A rotating mechanism for rotating neodymium iron boron magnet finished product 100 is installed on the detection table 2. A conveying mechanism for conveying neodymium iron boron magnet finished product 100 is installed in the middle of the detection table 2. During testing, the neodymium iron boron magnet product 100, conveyed by the conveying mechanism, is first picked up by the pick-and-place mechanism and moved to the left directly above the bottom imaging component. The bottom imaging component then captures an image of the bottom surface of the neodymium iron boron magnet product 100, obtaining visual information about its appearance. Subsequently, the pick-and-place mechanism moves the neodymium iron boron magnet product 100 to the left and places it on the rotating mechanism, which then rotates the product. The first industrial camera 3 on the upper left of the cover 5 can completely capture and record the appearance image information of the top and side surfaces of the neodymium iron boron magnet finished product 100. The appearance image information of each surface of the neodymium iron boron magnet finished product 100 is sent to the detection system to obtain the appearance inspection result of the neodymium iron boron magnet finished product 100. The detection system is electrically connected to the controller. Specifically, the detection system can use an image processing-based classification model to classify qualified products and defective products. The specific classification model adopts existing technology.

[0025] like Figure 2 and Figure 6As shown, the pick-and-place mechanism includes a movable frame 9, a cylinder 201, a suction cup frame 202, and a vacuum suction cup 203. The movable frame 9 is connected between the moving ends of the two front and rear electric slide rails 8. The cylinder 201 is mounted on the movable frame 9, and the extension end of the cylinder 201 is connected to the suction cup frame 202. The vacuum suction cup 203 is set on the suction cup frame 202. The number of vacuum suction cups 203 is consistent with the number of neodymium iron boron magnet finished products 100 to be tested, and their positions correspond. The vacuum suction cup 203 is provided with a vacuum source by a vacuum pump, and the vacuum suction cup 203 is provided with negative pressure by the vacuum pump. The adsorption function is achieved by extending the cylinder 201 to move the suction cup frame 202, which can move the vacuum suction cup 203 above the neodymium iron boron magnet product 100 so as to adsorb and grasp the neodymium iron boron magnet product 100. The electric slide rail 8 can drive the cylinder 201 to move back and forth between the turntable 304 and the conveying mechanism to transfer the position of the neodymium iron boron magnet product 100. During each inspection, the position of the pick-and-place mechanism is located at the rightmost end of the electric slide rail 8 to avoid the pick-and-place mechanism obstructing the appearance of the neodymium iron boron magnet product 100.

[0026] like Figure 3 and Figure 4 As shown, the bottom imaging assembly includes a second industrial camera 101. The second industrial camera 101 is mounted on the right side of the inner wall of the bottom frame 1 via a mounting bracket. An observation slot 305 is provided on the right side of the inspection table 2. The observation slot 305 is located directly above the second industrial camera 101. Through the observation slot 305, an image of the bottom surface of the neodymium iron boron magnet product 100 can be captured. Combined with the first industrial camera 3 located on the upper left of the cover 5, the top, side and bottom appearance images of the neodymium iron boron magnet product 100 can be captured completely.

[0027] like Figure 3 and Figure 4 As shown, the rotating mechanism includes a first motor 301, a first gear 302, a gear ring 303, and a turntable 304. The turntable 304 is rotatably mounted on the testing table 2, and the gear ring 303 is connected to the outer periphery of the turntable 304. The first motor 301 is installed on the right side of the testing table 2, and the output shaft of the first motor 301 is connected to the first gear 302. The first gear 302 meshes with the gear ring 303. After the turntable 304 is installed, the neodymium iron boron magnet product 100 to be tested is picked up by the vacuum suction cup 203 and placed on the turntable 304. At this time, the first motor 301 drives the first gear 302 to rotate, which in turn drives the gear ring 303 and the turntable 304 to rotate, so that the neodymium iron boron magnet product 100 on the turntable 304 rotates, so that the first industrial camera 3 can record a complete side image of the neodymium iron boron magnet product 100. The speed of the first motor 301 is adjustable to ensure synchronization with image acquisition and avoid image blurring.

[0028] like Figure 3As shown, the conveying mechanism includes a first conveyor belt 4, a second conveyor belt 601, an electric push rod 602, a push plate 603, and a transition plate 604. The first conveyor belt 4 and the second conveyor belt 601 are mounted side-by-side on the bottom frame 1 via brackets. The first conveyor belt 4 passes through the front and rear side walls of the cover 5. The electric push rod 602 is mounted on the side wall of the bottom frame 1 via brackets. The telescopic end of the electric push rod 602 is connected to the push plate 603, which faces the first conveyor belt 4. The transition plate 604 is mounted on the side wall of the bottom frame 1 via brackets, positioned between the first conveyor belt 4 and the second conveyor belt 601. The first conveyor belt 4, the transition plate 604, and the second conveyor belt 601 are arranged sequentially from high to low to ensure smooth transfer of the neodymium iron boron magnet finished product 100. After the inspection of the neodymium iron boron magnet finished product 100 on the turntable 304 is completed... The inspection system records the appearance images and inspection results of the neodymium iron boron magnet finished products 100 on each turntable 304. Then, the vacuum suction cup 203 picks up the neodymium iron boron magnet finished products 100 on the turntable 304 and places them uniformly on the first conveyor belt 4. If there are defective products, the inspection system sends an execution command to the electric push rod 602 through the controller. When the defective neodymium iron boron magnet finished product 100 passes the electric push rod 602, the electric push rod 602 immediately pushes the push plate 603. The push plate 603 first pushes the defective neodymium iron boron magnet finished product 100 to the transition plate 604, and then continues to push it to the second conveyor belt 601. The second conveyor belt 601 outputs the defective products separately. In this way, qualified products and defective products are sorted and transported. The conveying rhythm of the first conveyor belt 4 and the second conveyor belt 601 is adapted to the inspection rhythm.

[0029] Example 2: Based on Example 1, such as Figure 5 and Figure 7As shown, it also includes a correction mechanism, which includes a positioning frame 401, a guide rod 402, a correction rod 403, an internal gear ring 404, a second gear 405, a rubber sleeve 406, a second motor 407, a worm gear 408, and a spring 409. The guide rod 402 is evenly slidably connected to the side wall of the suction cup frame 202. A spring 409 connects the guide rod 402 to the suction cup frame 202. The lower end of the guide rod 402 is connected to the positioning frame 401. The positioning frame 401 has evenly spaced through slots, the same number as the turntable 304. The diameter of the through slots is larger than the diameter of the neodymium iron boron magnet product 100 to be tested. The correction rod 403... The guide rod 403 is uniformly rotated around the circumference of the through groove. A second gear 405 is installed at the shaft of each guide rod 403. An internal gear ring 404 is rotatably provided on the outer circumference of the through groove. The internal gear ring 404 is rotatably connected to the positioning frame 401. A second motor 407 is installed on the positioning frame 401. The output shaft of the second motor 407 is connected to a worm gear 408. A worm wheel groove that meshes with the worm gear 408 is provided on the outer circumference of the internal gear ring 404. The internal gear ring 404 meshes with the second gear 405. A rubber sleeve 406 is installed at the end of the guide rod 403. After adding the rubber sleeve 406, the damage to the surface of the neodymium iron boron magnet finished product 100 by the guide rod 403 can be reduced.The neodymium iron boron magnet finished product 100 conveyed on the first conveyor belt 4 may be misaligned, making it inconvenient for the pick-and-place mechanism to pick it up. Therefore, it is necessary to correct the misalignment of the neodymium iron boron magnet finished product 100. During the correction, the cylinder 201 extends to move the suction cup frame 202 downward until the neodymium iron boron magnet finished product 100 is located in the through groove and is flush with the correction rod 403. Then, the second motor 407 rotates forward to drive the worm gear 408 to rotate, which can drive the internal gear ring 404 to rotate through the worm gear groove, thereby making the second gear 40 5. Rotation causes each correction rod 403 to swing towards the center of the slot, thereby centering the neodymium iron boron magnet product 100. Then, the cylinder 201 is extended to move the suction cup frame 202 downward until the vacuum suction cup 203 contacts the upper surface of the neodymium iron boron magnet product 100. During this process, the guide rod 402 and the positioning frame 401 stop moving downward due to the obstruction of the upper surface of the first conveyor belt 4, and the spring 409 is stretched under force. Then, the vacuum pump provides negative pressure to the vacuum suction cup 203, causing the vacuum suction cup 203 to hold the neodymium iron boron magnet 100. The neodymium iron boron magnet product 100 is attracted, and then the second motor 407 is driven to rotate in the opposite direction, causing the correction rod 403 to rotate in the opposite direction and release the centered neodymium iron boron magnet product 100. Then, the control cylinder 201 extends, driving the suction cup frame 202 to move upward until the neodymium iron boron magnet product 100 and the positioning frame 401 are separated from the first conveyor belt 4. During this process, the guide rod 402 and the positioning frame 401 are reset under the elastic force of the spring 409. Finally, the electric slide rail 8 drives the pick-and-place mechanism to move to directly above the turntable 304, and then... After the neodymium iron boron magnet product 100 is accurately placed on the turntable 304, it is released to facilitate subsequent testing. The correction mechanism can adapt to the positional deviation of the neodymium iron boron magnet product 100 on the first conveyor belt 4, improving the accuracy and stability of picking and placing, and reducing the negative impact on imaging quality and testing accuracy. In addition, during the process of picking up the neodymium iron boron magnet product 100 and putting it back on the first conveyor belt 4 after testing, the correction mechanism can be left undone to avoid damage to the neodymium iron boron magnet product 100 by the correction rod 403.

[0030] like Figure 8 As shown, an inspection door 6 is installed on the left side of the enclosure 5. The inspection door 6 is equipped with a handle, which can be rotated to open the inspection door 6 so as to carry out maintenance work inside the device. Transparent windows 7 are installed on the front, rear and right sides of the enclosure 5, through which the working conditions inside the enclosure 5 can be observed.

[0031] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. An automatic visual inspection device for finished neodymium iron boron magnets, comprising a base frame (1), an inspection table (2), a cover (5), and a first industrial camera (3), wherein the inspection table (2) is mounted on the upper part of the base frame (1), the cover (5) is mounted on the upper part of the inspection table (2), and the first industrial camera (3) is obliquely mounted on the upper left part of the cover (5), the shooting range of the first industrial camera (3) covers the entire upper surface of the inspection table (2), characterized in that: It also includes an electric slide rail (8), a pick-and-place mechanism, a bottom surface imaging component, a rotating mechanism and a conveying mechanism. The electric slide rail (8) is symmetrically installed on the front and rear sides of the cover (5). A pick-and-place mechanism for picking up and placing neodymium iron boron magnet finished products (100) is installed between the moving ends of the electric slide rail (8). A bottom surface imaging component for taking pictures of the bottom surface of neodymium iron boron magnet finished products (100) is installed on the right side inside the bottom frame (1). A rotating mechanism for rotating neodymium iron boron magnet finished products (100) is installed on the testing table (2). A conveying mechanism for conveying neodymium iron boron magnet finished products (100) is installed in the middle of the testing table (2).

2. The automatic visual inspection device for finished neodymium iron boron magnets as described in claim 1, characterized in that: The bottom imaging assembly includes a second industrial camera (101). The second industrial camera (101) is mounted on the right side of the inner wall of the bottom frame (1) via a mounting bracket. An observation slot (305) is provided on the right side of the inspection table (2). The observation slot (305) is located directly above the second industrial camera (101).

3. The automatic visual inspection device for finished neodymium iron boron magnets as described in claim 2, characterized in that: The pick-and-place mechanism includes a movable frame (9), a cylinder (201), a suction cup frame (202), and a vacuum suction cup (203). The movable frame (9) is connected between the moving ends of the two electric slide rails (8) at the front and rear. The cylinder (201) is mounted on the movable frame (9). The telescopic end of the cylinder (201) is connected to the suction cup frame (202). The vacuum suction cup (203) is set on the suction cup frame (202). The vacuum suction cup (203) is provided with a vacuum source by a vacuum pump.

4. An automatic visual inspection device for finished neodymium iron boron magnets as described in claim 3, characterized in that: The rotating mechanism includes a first motor (301), a first gear (302), a gear ring (303), and a turntable (304). The turntable (304) is rotatably mounted on the testing platform (2). The gear ring (303) is connected to the outer periphery of the turntable (304). The first motor (301) is mounted on the right side of the testing platform (2). The output shaft of the first motor (301) is connected to the first gear (302). The first gear (302) meshes with the gear ring (303).

5. An automatic visual inspection device for finished neodymium iron boron magnets as described in claim 4, characterized in that: The conveying mechanism includes a first conveyor belt (4), a second conveyor belt (601), an electric push rod (602), a push plate (603), and a transition plate (604). The first conveyor belt (4) and the second conveyor belt (601) are installed side by side on the bottom frame (1) via brackets. The first conveyor belt (4) passes through the front and rear side walls of the cover (5). The electric push rod (602) is installed on the side wall of the bottom frame (1) via brackets. The extension end of the electric push rod (602) is connected to the push plate (603). The transition plate (604) is installed on the side wall of the bottom frame (1) via brackets. The transition plate (604) is located between the first conveyor belt (4) and the second conveyor belt (601).

6. An automatic visual inspection device for finished neodymium iron boron magnets as described in claim 5, characterized in that: It also includes a correction mechanism, which includes a positioning frame (401), a guide rod (402), a correction rod (403), an internal gear ring (404), a second gear (405), a rubber sleeve (406), a second motor (407), a worm gear (408), and a spring (409). The guide rod (402) is slidably connected to the suction cup frame (202), and the spring (409) is connected between the guide rod (402) and the suction cup frame (202). The lower end of the guide rod (402) is connected to the positioning frame (401), and the positioning frame (401) is evenly distributed with respect to the turntable (3). 04) A uniform number of through slots, with the correction rods (403) evenly rotating and arranged on the circumference of the through slots. A second gear (405) is installed at the shaft of each correction rod (403). An internal gear ring (404) is provided on the outer circumference of the through slot. A second motor (407) is installed on the positioning frame (401). The output shaft of the second motor (407) is connected to a worm (408). A worm wheel groove that meshes with the worm (408) is provided on the outer circumference of the internal gear ring (404). The internal gear ring (404) meshes with the second gear (405). A rubber sleeve (406) is installed at the end of the correction rod (403).

7. An automatic visual inspection device for finished neodymium iron boron magnets as described in claim 6, characterized in that: An inspection door (6) is installed on the left side of the cover (5), and a handle is fitted on the inspection door (6).

8. An automatic visual inspection device for finished neodymium iron boron magnets as described in claim 7, characterized in that: Transparent windows (7) are installed on the front, back and right sides of the cover (5).

Images