A method for visual inspection of a terminal

Abstract

The application discloses a kind of visual inspection methods for terminal, comprising the following steps: S1. by the first camera to the A face of terminal photograph detection;S2. by the second camera to the E face of terminal photograph detection;S3. by the third camera to the E face of terminal photograph detection;S4. by the fourth camera to the A face of terminal photograph detection;S5. by E face camera to the E face of terminal photograph detection;S6. by A face camera to the A face of terminal photograph detection;S7. by B face camera to the B face of terminal photograph detection;S8. by D face camera to the D face of terminal photograph detection;S9. by C face camera to the C face of terminal photograph detection;S10. by F face camera to the F face of terminal photograph detection.The application greatly improves detection efficiency and detection accuracy.

Description

A visual inspection method for terminal blocks Technical Field

[0001] This invention relates to the field of terminal block technology, and in particular to a visual inspection method for terminal blocks. Background Technology

[0002] The shape, outline, wire arrangement, color, and surface cracks of terminal blocks determine their contact performance, thus affecting terminal quality. Current terminal block defect detection is generally performed by visual observation from different angles. This requires not only experienced personnel but also sustained high levels of concentration. For workers on assembly lines, continuous operation can easily lead to visual fatigue, resulting in decreased efficiency and accuracy, and inevitably causing false positives and missed positives. Therefore, manual inspection methods are unsuitable for today's high-speed, precise, and automated production requirements. Improving the automation level of terminal block inspection, enhancing terminal block production quality, and reducing production costs are pressing issues facing the terminal block manufacturing industry. Summary of the Invention

[0003] To address the shortcomings and defects of existing technologies, a visual inspection method for terminal blocks is provided, which can automatically inspect terminal blocks, greatly improving inspection efficiency and accuracy.

[0004] To achieve the above objectives, the present invention provides the following technical solutions.

[0005] A visual inspection method for terminal blocks, wherein the terminal block has an A-side located on the rear side, a B-side located on the left side, a C-side located on the front side, a D-side located on the right side, an E-side located on the top side, and a F-side located on the bottom side. The E-side of the terminal block has an upper screw hole and a screw installed in the upper screw hole, and the C-side of the terminal block has a front screw hole.

[0006] The visual inspection method includes the following steps:

[0007] S1. Take a picture of side A of the terminal block using the first camera to check whether the size of the joint between the plastic cover plate and the plastic body on side A of the terminal block is normal.

[0008] S2. Take a picture of the E side of the terminal block using the second camera to check whether the screws in the screw holes on the E side of the terminal block are missing or mixed, and whether the screws have poor electroplating.

[0009] S3. Take a picture of the E side of the terminal block using a third camera to check whether the screw hole on the E side of the terminal block is damaged and whether there is a color difference in the screw;

[0010] S4. Take a picture of side A of the terminal block using the fourth camera to detect whether the internal square box of side A of the terminal block is missing or mixed.

[0011] S5. Take a picture of the E side of the terminal block using the E-side camera to inspect the surface of the E side of the terminal block;

[0012] S6. Take a picture of the A side of the terminal block using the A side camera to inspect the surface of the A side of the terminal block;

[0013] S7. Take a picture of the B side of the terminal block using the B side camera to inspect the surface of the B side of the terminal block;

[0014] S8. Take a picture of the D side of the terminal block using the D-side camera to inspect the surface of the D side of the terminal block;

[0015] S9. Take a picture of the C-side of the terminal block using a C-side camera to inspect the surface of the C-side of the terminal block;

[0016] S10. Take a picture of the F side of the terminal block using the F side camera to inspect the surface of the F side of the terminal block.

[0017] The beneficial effects of the present invention are as follows: The visual inspection method of the present invention uses multiple cameras corresponding to the surface of the terminal block to inspect each surface of the terminal block separately. At the same time, multiple cameras are also set to cooperate with the screw holes of the terminal block to inspect the screws inside the terminal block. The inspection is comprehensive and efficient, and only one or two operators are needed, saving labor costs.

[0018] As an improvement of the present invention, a visual inspection device is also included. The visual inspection device includes a frame and a conveying track disposed on the frame. The conveying track drives the wiring terminals to move from left to right. A first camera, a second camera, a third camera, a fourth camera, an E-side camera, an A-side camera, a B-side camera, a D-side camera, a C-side camera, and an F-side camera are arranged sequentially from left to right along the conveying track.

[0019] As an improvement of the present invention, the conveying track has a twisting conveying section between the D-side camera and the C-side camera. The input end and the output end of the twisting conveying section are set perpendicularly, so that when the wiring terminal enters from the input end of the twisting conveying section, it is rotated 90 degrees by the twisting conveying section and then moved out from the output end, so that the wiring terminal is twisted from E-side facing upward to F-side facing upward.

[0020] As an improvement of the present invention, the E-side camera is positioned above the conveyor track and vertically downwards opposite the E-side of the terminal block to capture images of the E-side of the terminal block. The A-side camera is positioned on one side of the conveyor track and opposite the A-side of the terminal block to capture images of the A-side of the terminal block. The B-side camera and the D-side camera are respectively positioned adjacent to each other above the conveyor track, with the B-side camera tilted to the right and the D-side camera tilted to the left. When the terminal block moves between the B-side camera and the D-side camera, the B-side camera captures images of the B-side of the terminal block, and the D-side camera captures images of the D-side of the terminal block. The C-side camera is positioned above the conveyor track and vertically downwards opposite the C-side of the terminal block to capture images of the C-side of the terminal block. The F-side camera is positioned on one side of the conveyor track and opposite the F-side of the terminal block to capture images of the F-side of the terminal block.

[0021] As an improvement of the present invention, the first camera is disposed on one side of the conveying track, opposite to the A side of the terminal block, to capture the A side of the terminal block; the second camera and the third camera are respectively disposed directly above the conveying track, and vertically downward opposite to the E side of the terminal block, to capture the E side of the terminal block respectively; the fourth camera is disposed diagonally above the conveying track, and the fourth camera is tilted towards the conveying track.

[0022] As an improvement of the present invention, integrating sphere light sources are respectively provided at the E-side camera, A-side camera, C-side camera and F-side camera, and coaxial light sources are respectively provided at the first camera, second camera and third camera.

[0023] As an improvement of the present invention, the E-side camera, A-side camera, C-side camera and F-side camera are respectively mounted on the frame by a height adjustment mechanism. The height adjustment mechanism includes a bracket set on the frame, a mounting base slidably set on the bracket and a fastener for fixing the mounting base, and the camera lens is set on the mounting base.

[0024] As an improvement of the present invention, the visual inspection device further includes a position adjustment mechanism disposed between the B-side camera and the D-side camera. The position adjustment mechanism includes a vertically arranged vertical support, a horizontal bar slidably disposed on the vertical support, and an adjustment mounting base slidably disposed on the horizontal bars at both ends. The B-side camera and the D-side camera are respectively fixedly disposed on the corresponding adjustment mounting base.

[0025] As an improvement of the present invention, the position adjustment mechanism further includes an angle adjustment plate, which is provided with an arc-shaped slide groove. A connector passes through the arc-shaped slide groove and is connected to the mounting base. The B-side camera and the D-side camera are respectively mounted on the adjustment mounting base through the angle adjustment plate.

[0026] As an improvement of the present invention, the frame is also provided with a first screening mechanism behind the D-side camera and a second screening mechanism located behind the F-side camera. Attached Figure Description

[0027] Figure 1 is a schematic diagram of the terminal structure of the present invention.

[0028] Figure 2 is a schematic diagram of the terminal block structure of the present invention from another angle.

[0029] Figure 3 is a top view of the overall structure of the visual inspection device of the present invention.

[0030] Figure 4 is a schematic diagram of the overall structure of the visual inspection device of the present invention.

[0031] Figure 5 is a schematic diagram of the torsion conveying section structure of the present invention.

[0032] Figure 6 is a partially enlarged structural diagram of point A in Figure 4 of the present invention.

[0033] Figure 7 is a partially enlarged structural diagram of point B in Figure 4 of the present invention.

[0034] In the diagram, 1. Terminal block; 1.1. Side A; 1.2. Side B; 1.3. Side C; 1.4. Side D; 1.5. Side E; 1.6. Side F; 1.7. Front screw hole; 1.8. Square box; 2. Frame; 3. Conveyor track; 3.1. Twisting conveyor section; 4. First camera; 5. Second camera; 6. Third camera; 7. Fourth camera; 8. Side E camera; 9. Side A camera; 10. Side B camera; 11. Side D camera; 12. Side C camera; 13. Side F camera; 14. Integrating sphere light source; 15. Coaxial light source; 16. Height adjustment mechanism; 16.1. Bracket; 16.2. Mounting base; 17. Position adjustment mechanism; 17.1. Mounting bracket; 17.2. Crossbar; 17.3. Mounting base; 17.4. Angle adjustment plate; 17.5. Arc groove; Detailed Implementation

[0035] The invention will be further explained with reference to the accompanying drawings.

[0036] A visual inspection method for a terminal block 1 is shown in Figures 1 to 7, including a detection device for inspecting the terminal block 1.

[0037] Referring to Figures 1 and 2, when the terminal block 1 is placed horizontally, the terminal block 1 has a rear A side 1.1, a left side B side 1.2, a front C side 1.3, a right side D side 1.4, a top E side 1.5, and a bottom F side 1.6. The terminal block 1 has an upper screw hole on the E side 1.5 and a front screw hole 1.7 on the C side 1.3.

[0038] Referring to Figures 3 to 7, the visual inspection device includes a frame 2, a conveying track 3 mounted on the frame 2, an inspection mechanism, and an image processing system. The conveying track 3 is used to place the terminal block 1 and drive the terminal block 1 to move from left to right.

[0039] The inspection mechanism includes multiple visual inspection lenses arranged sequentially along the movement direction of the conveyor track 3. The multiple visual inspection lenses are mounted on the frame 2 and are respectively a first camera 4, a second camera 5, a third camera 6, a fourth camera 7, a 1.5 camera on side E, a 1.1 camera on side A, a 1.2 camera on side B, a 1.4 camera on side D, a 1.3 camera on side C, and a 1.6 camera on side F.

[0040] The signal output terminals of the visual inspection lens interact with the signal input terminals of the image processing system to make judgments on the photos captured by the visual inspection lens through the image processing system.

[0041] Specifically, the first camera 4 is mounted on the side of the conveyor rail 3 via a bracket 16.1, so that the first camera 4 is directly in front of the A side 1.1 of the terminal block 1, allowing the first camera 4 to clearly photograph the terminal block 1. The image processing system detects whether the joint between the plastic cover and the plastic body on the A side 1.1 of the terminal block 1 is normal based on the photo taken by the first camera 4. Furthermore, a coaxial light source 15 is provided at the first camera 4, with a reflective prism at its center. This reflective prism does not affect the shooting of the first camera 4 and allows the horizontal light emitted from the side light source to shine vertically downward through the reflective prism, so that the shooting direction of the first camera 4 and the light direction are coaxial, overcoming the interference caused by surface reflection.

[0042] The second camera 5 is mounted directly above the conveyor rail 3 via an adjustment mechanism, positioning the visual inspection lens directly above the E-side 1.5 of the terminal block 1. This allows the second camera 5 to photograph and inspect the E-side 1.5 of the product. The adjustment mechanism includes a bracket 16.1 vertically mounted on the frame 2, a mounting base 17.316.2 slidably mounted on the bracket 16.1, and fasteners securing the mounting base 17.316.2. The second camera 5 is mounted on the mounting base 17.316.2. By adjusting the position of the second camera 5, it can clearly photograph the terminal block 1. The image processing system uses the photograph taken by the second camera 5 to detect whether screws are missing, mixed, or have poor plating in the screw holes on the E-side 1.5 of the terminal block 1. Furthermore, a coaxial light source 15 is provided at the second camera 5. The coaxial light source 15 has a reflective prism at its center. This reflective prism does not affect the shooting of the second camera 5, and allows the horizontal light emitted from the side light source to shine vertically downward through the reflective prism, so that the shooting direction of the second camera 5 and the light direction are coaxial, thus overcoming the interference caused by surface reflection.

[0043] The third camera 6 is mounted directly above the conveyor rail 3 via an adjustment mechanism, positioning it directly above the E-side 1.5 of the terminal block 1. This allows the third camera 6 to photograph and inspect the E-side 1.5 of the product. The adjustment mechanism includes a bracket 16.1 vertically mounted on the frame 2, a mounting base 17.316.2 slidably mounted on the bracket 16.1, and fasteners securing the mounting base 17.316.2. The third camera 6 is mounted on the mounting base 17.316.2. By adjusting the position of the third camera 6, the inspection lens can clearly photograph the terminal block 1. The image processing system uses the photograph taken by the inspection lens to check whether the screw holes on the E-side 1.5 of the terminal block 1 are damaged and whether there is a significant color difference in the screws. Furthermore, a coaxial light source 15 is provided at the third camera 6. The coaxial light source 15 has a reflective prism at its center. This reflective prism does not affect the shooting of the third camera 6, and allows the horizontal light emitted from the side light source to shine vertically downward through the reflective prism, so that the shooting direction of the third camera 6 and the light direction are coaxial, thus overcoming the interference caused by surface reflection.

[0044] The fourth camera 7 is installed diagonally above the conveyor rail 3 via an adjustment mechanism, and the fourth camera 7 is tilted towards the conveyor rail 3 to take pictures and detect the A-side 1.1 of the terminal block 1. Specifically, the adjustment mechanism includes a bracket 16.1 vertically mounted on the frame 2, a mounting base 17.316.2 slidably mounted on the bracket 16.1, and fasteners for fixing the mounting base 17.316.2. The fourth camera 7 is mounted on the mounting base 17.316.2 via an angle adjustment plate 17.4. The angle adjustment plate 17.4 is provided with an arc-shaped groove, and a connector passes through the arc-shaped groove to connect with the mounting base 17.316.2. The fourth camera 7 is mounted on the mounting base 17.316.2 via the angle adjustment plate 17.4. The fourth camera 7 is connected to the mounting base 17.316.2 via fasteners passing through the arc-shaped groove. By adjusting the height and tilt angle of the fourth camera 7, it can clearly photograph the A-side 1.1 of the terminal block 1, thus revealing whether the internal square box 1.8 of the A-side 1.1 of the terminal block 1 is missing or misplaced. The image processing system detects whether the internal square box 1.8 of the A-side 1.1 of the terminal block 1 is missing or misplaced based on the photograph taken by the detection lens. Furthermore, a coaxial light source 15 is provided at the fourth camera 7, with a reflecting prism at its center. This reflecting prism does not affect the shooting of the fourth camera 7 and allows the horizontal light emitted from the side light source to shine vertically downwards through the reflecting prism, ensuring that the shooting direction of the fourth camera 7 and the direction of the light are coaxial, overcoming interference caused by surface reflection.

[0045] The E-side 1.5 camera is mounted directly above the conveyor rail 3 via an adjustment mechanism, positioning it directly above the E-side 1.5 of the terminal block 1. This allows the camera to capture images of the E-side 1.5 of the terminal block 1 for inspection. The adjustment mechanism includes a bracket 16.1 vertically mounted on the frame 2, a mounting base 17.316.2 slidably mounted on the bracket 16.1, and fasteners securing the mounting base 17.316.2. The E-side 1.5 camera is mounted on the mounting base 17.316.2, and a driving element moves the mounting base 17.316.2 along the bracket 16.1, thereby adjusting the position of the E-side 1.5 camera to clearly capture images of the E-side 1.5 of the terminal block 1. The image processing system then uses the images captured by the inspection lens to detect defects such as scratches, dirt, damage, and burrs on the surface of the E-side 1.5 of the terminal block 1. Furthermore, an integrating sphere light source 14 is provided at the 1.5 camera on the E side. The integrating sphere light source 14 is set up in an inverted hemispherical shape. The sphere integrating light source has a good illumination effect on the terminal 1, so that the terminal 1 can be well illuminated, so that the 1.5 camera on the E side can obtain a uniform and clear image.

[0046] A camera on side A.1 is mounted beside the conveyor rail 3 via an adjustment mechanism, positioning it directly in front of side A.1.1 of terminal 1. This allows the camera to photograph and inspect side A.1.1 of terminal 1. The adjustment mechanism includes a bracket 16.1 vertically mounted on the frame 2, a mounting base 17.316.2 slidably mounted on the bracket 16.1, and fasteners securing the mounting base 17.316.2. The camera on side A.1 is mounted on the mounting base 17.316.2, and a driving element moves the mounting base 17.316.2 along the bracket 16.1, adjusting the position of the camera to clearly photograph side A.1. The image processing system then uses the photograph taken by the detection lens to check for defects such as scratches, dirt, damage, and burrs on the surface of side A.1. Furthermore, an integrating sphere light source 14 is provided at the camera on side A 1.1. The integrating sphere light source 14 is set up in an inverted hemispherical shape. The sphere integrating light source has a good illumination effect on the terminal 1, so that the terminal 1 can be well illuminated, so that the camera on side A 1.1 can obtain a uniform and clear image.

[0047] Cameras 1.2 on side B and 1.4 on side D are mounted above the conveyor rail 3 via a position adjustment mechanism 17. Camera 1.2 on side B is tilted downwards to the right, and camera 1.4 on side D is tilted downwards to the left. The position adjustment mechanism 17 includes a vertical support 16.1 mounted vertically on the frame 2. A horizontally mounted crossbar 17.2 is slidably mounted on the vertical support 16.1, allowing the crossbar 17.2 to move up and down along the support 16.1. Cameras 1.2 on side B and 1.4 are slidably mounted on the crossbar 17.2 at intervals via corresponding adjusting mounting seats 17.3 and 16.2. By setting the crossbar 17.2, the adjusting mounting seats 17.3 and 16.2 can move horizontally, thereby allowing cameras 1.2 on side B and 1.4 to move horizontally and vertically relative to the vertical support 16.1.

[0048] Furthermore, the B-side 1.2 camera and the D-side 1.4 camera are respectively mounted on the corresponding adjustment mounting bases 17.316.2 via angle adjustment plates 17.4. The angle adjustment plates 17.4 are provided with arc-shaped grooves, and are connected to the adjustment mounting bases 17.316.2 via connectors passing through the arc-shaped grooves. The B-side 1.2 camera and the D-side 1.4 camera are respectively mounted on the adjustment mounting bases 17.316.2 via angle adjustment plates 17.4. Fasteners are connected to the adjustment mounting bases 17.316.2 via the arc-shaped grooves. By adjusting the tilt angle of the B-side 1.2 camera and the D-side 1.4 camera, they can clearly photograph the terminal block 1. The image processing system detects whether there are scratches, dirt, damage, burrs, or other defects on the surface of the B-side 1.2 of the terminal block 1 based on the photos taken by the B-side 1.2 camera. The image processing system uses the photos taken by the camera on side D1.4 to detect whether there are defects such as scratches, dirt, damage, or burrs on the surface of terminal 1 on side D1.4.

[0049] The conveying track 3 has a torsion conveying section 3.1 located between the eighth and ninth workstations. The torsion conveying section 3.1 is torsion in shape, so that the input end and the output end of the torsion conveying section 3.1 are set perpendicularly. When the terminal 1 enters from the input end of the torsion conveying section 3.1, it is rotated 90 degrees by the torsion conveying section 3.1 and then moved out from the output end. This causes the terminal 1 to be torsion from E side 1.5 facing upwards to C side 1.3 facing upwards.

[0050] A camera on surface C1.3 is mounted directly above the conveyor rail 3 via an adjustment mechanism, positioning it directly above surface C1.3 of terminal 1. This allows the camera to capture images of surface C1.3 of terminal 1 for inspection. The adjustment mechanism includes a bracket 16.1 vertically mounted on the frame 2, a mounting base 17.316.2 slidably mounted on the bracket 16.1, and fasteners securing the mounting base 17.316.2. The camera on surface C1.3 is mounted on the mounting base 17.316.2, and a driving element moves the mounting base 17.316.2 along the bracket 16.1, adjusting the position of the camera to ensure a clear image of surface C1.3 of terminal 1. The image processing system then uses the images captured by the camera to detect defects such as scratches, dirt, breakage, and burrs on the surface of surface C1.3 of terminal 1. Furthermore, an integrating sphere light source 14 is provided at the camera on the C-side 1.3. The integrating sphere light source 14 is set up in an inverted hemispherical shape. The sphere integrating light source has a good illumination effect on the terminal 1, so that the terminal 1 can be well illuminated, so that the camera on the C-side 1.3 can obtain a uniform and clear image.

[0051] The F-side 1.6 camera is mounted beside the conveyor rail 3 via an adjustment mechanism, positioning it directly in front of the F-side 1.6 of the terminal block 1. This allows the camera to capture images of the F-side 1.6 of the terminal block 1 for inspection. The adjustment mechanism includes a bracket 16.1 vertically mounted on the frame 2, a mounting base 17.316.2 slidably mounted on the bracket 16.1, and fasteners securing the mounting base 17.316.2. The F-side 1.6 camera is mounted on the mounting base 17.316.2, and a driving element moves the mounting base 17.316.2 along the bracket 16.1, thereby adjusting the position of the F-side 1.6 camera to clearly capture images of the F-side 1.6 of the terminal block 1. The image processing system then uses the images captured by the inspection lens to detect defects such as scratches, dirt, breakage, and burrs on the surface of the F-side 1.6 of the terminal block 1. Furthermore, an integrating sphere light source 14 is provided at the F-side 1.6 camera. The integrating sphere light source 14 is set up in an inverted hemispherical shape. The sphere integrating light source has a good illumination effect on the terminal 1, so that the terminal 1 can be well illuminated, so that the F-side 1.6 camera can obtain a uniform and clear image.

[0052] In addition, the conveying track 3 is also equipped with a first screening mechanism located behind the camera on side D 1.4 and a second screening mechanism located behind the camera on side F 1.6. The first pushing mechanism includes a push block and a driving component that drives the push block to move. When the terminal block 1 is detected as unqualified by any one or more of the first camera 4, second camera 5, third camera 6, fourth camera 7, camera on side E 1.5, camera on side A 1.1, camera on side B 1.2, and camera on side D 1.4, the driving component will drive the push block to move, so as to push the unqualified terminal block 1 out of the track.

[0053] The second pushing mechanism includes a push block and a driving component that drives the push block to move. When the terminal block 1 is detected as non-conforming by the camera on the C-side 1.3 or the camera on the F-side 1.6, the driving component will drive the push block to move so as to push the non-conforming terminal block 1 out of the track, thereby ensuring that only the qualified terminal block 1 can be removed from the conveying track 3.

[0054] This application also discloses a visual inspection method for terminal block 1.

[0055] S1. Place the terminal block 1 to be tested on the conveyor track 3, with the E side 1.5 of the terminal block 1 facing upwards, the A side 1.1 of the terminal block 1 facing forward, and the C side 1.3 of the terminal block 1 facing backwards; the conveyor track 3 moves the terminal block 1 from left to right, and the first camera 4 takes a picture of the A side 1.1 of the terminal block 1 to check whether the size of the joint between the plastic cover plate and the plastic body on the A side 1.1 of the terminal block 1 is normal;

[0056] S2. Take a picture of the E side 1.5 of the terminal block 1 using the second camera 5 to detect whether the screws in the upper screw hole of the E side 1.5 of the terminal block 1 are missing or mixed, and whether the screws have poor electroplating.

[0057] S3. Take a picture of the E side 1.5 of the terminal block 1 using the third camera 6 to check whether the screw hole on the E side 1.5 of the terminal block 1 is damaged and whether there is a color difference in the screw;

[0058] S4. Take a picture of side A 1.1 of terminal 1 using the fourth camera 7 to detect whether the internal square box 1.8 of side A 1.1 of terminal 1 is missing or mixed;

[0059] S5. Take a picture of the E-side 1.5 of the terminal block 1 using the E-side 1.5 camera to inspect the surface of the E-side 1.5 of the terminal block 1;

[0060] S6. Take a picture of the A-side 1.1 of the terminal block 1 using the camera on side A.1 to inspect the surface of the A-side 1.1 of the terminal block 1;

[0061] S7. Take a picture of the B-side 1.2 of the terminal block 1 using the camera on the B-side 1.2 to inspect the surface of the B-side 1.2 of the terminal block 1;

[0062] S8. The D-side 1.4 of the terminal block 1 is photographed and inspected by the camera on the D-side 1.4 to inspect the surface of the D-side 1.4 of the terminal block 1; when it is determined whether the camera detects any unqualified items, the first screening mechanism is activated to push the unqualified terminal block 1 out of the conveyor track 3.

[0063] S9. Take a picture of the C-side 1.3 of the terminal block 1 using the camera on the C-side 1.3 to inspect the surface of the C-side 1.3 of the terminal block 1;

[0064] S10. The F-side 1.6 of the terminal block 1 is photographed and inspected by the camera on the F-side 1.6 to inspect the surface of the F-side 1.6 of the terminal block 1; when it is determined whether the camera detects any unqualified items, the second screening mechanism is activated to push the unqualified terminal block 1 out of the conveyor track 3.

[0065] S11. The test is completed, and the qualified terminal block 1 is removed from the conveyor rail 3.

[0066] The detection method of the present invention, by setting multiple cameras on the frame 2, can detect each surface of the terminal 1 separately. At the same time, by passing through the upper and lower screw holes on the terminal 1, the cameras can detect the screws inside the terminal 1. The detection is comprehensive and efficient. Moreover, by setting the torsion conveyor section 3.1, the terminal 1 can be flipped, thereby ensuring that the cameras can detect each surface of the terminal 1.

[0067] The above description is only a preferred embodiment of the present invention. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the claims of this patent application are included in the scope of this patent application.

Claims

1. A visual inspection method for terminal blocks, characterized in that... The terminal block has an A-side located at the rear, a B-side located on the left, a C-side located at the front, a D-side located on the right, an E-side located at the top, and an F-side located at the bottom. The E-side of the terminal block has a screw hole and a screw installed in the screw hole. The C-side of the terminal block has a front screw hole. The device also includes a vision inspection unit, which includes a frame and a conveyor rail mounted on the frame. The conveyor rail drives the terminal block to move from left to right. A first camera, a second camera, a third camera, a fourth camera, an E-side camera, an A-side camera, a B-side camera, a D-side camera, a C-side camera, and an F-side camera are sequentially arranged along the conveyor rail from left to right. The track, located between the D-side camera and the C-side camera, has a torsional conveyor section. The input and output ends of the torsional conveyor section are perpendicularly arranged, so that when the terminal enters from the input end of the torsional conveyor section, it is rotated 90 degrees by the torsional conveyor section and then moved out from the output end, causing the terminal to be twisted from facing E-side upwards to facing F-side upwards. Integrating sphere light sources are respectively installed at the E-side camera, A-side camera, C-side camera, and F-side camera, and coaxial light sources are respectively installed at the first camera, second camera, and third camera. The visual inspection method includes the following steps: S1. Taking a picture of the A-side of the terminal using the first camera to inspect the terminal. S2. Use the second camera to photograph and inspect the E side of the terminal block to check if any screws in the upper screw holes on the E side of the terminal block are missing or mixed, and if the screws have poor electroplating; S3. Use the third camera to photograph and inspect the E side of the terminal block to check if any upper screw holes on the E side of the terminal block are damaged and if the screws have color differences; S4. Use the fourth camera to photograph and inspect the A side of the terminal block to check if any internal square boxes on the A side of the terminal block are missing or mixed; S5. Use the E side camera to photograph and inspect the E side of the terminal block to check the E side of the terminal block. S6. Take a picture of side A of the terminal block using the A-side camera to inspect the surface of side A of the terminal block; S7. Take a picture of side B of the terminal block using the B-side camera to inspect the surface of side B of the terminal block; S8. Take a picture of side D of the terminal block using the D-side camera to inspect the surface of side D of the terminal block; S9. Take a picture of side C of the terminal block using the C-side camera to inspect the surface of side C of the terminal block; S10. Take a picture of side F of the terminal block using the F-side camera to inspect the surface of side F of the terminal block.

2. The visual inspection method for terminal blocks according to claim 1, characterized in that... The E-side camera is positioned above the conveyor rail, vertically downwards, opposite the E-side of the terminal block, to capture images of the E-side. The A-side camera is positioned on one side of the conveyor rail, opposite the A-side of the terminal block, to capture images of the A-side. The B-side and D-side cameras are positioned adjacent to each other above the conveyor rail, with the B-side camera tilted to the right and the D-side camera tilted to the left. When the terminal block moves between the B-side and D-side cameras, the B-side camera captures images of the B-side of the terminal block, and the D-side camera captures images of the D-side. The C-side camera is positioned above the conveyor rail, vertically downwards, opposite the C-side of the terminal block, to capture images of the C-side. The F-side camera is positioned on one side of the conveyor rail, opposite the F-side of the terminal block, to capture images of the F-side.

3. The visual inspection method for terminal blocks according to claim 1, characterized in that... The first camera is positioned on one side of the conveyor track, opposite to side A of the terminal block, to capture images of side A of the terminal block; the second and third cameras are positioned directly above the conveyor track, vertically downwards, opposite to side E of the terminal block, to capture images of side E of the terminal block; the fourth camera is positioned diagonally above the conveyor track, and is tilted towards the conveyor track.

4. The visual inspection method for terminal blocks according to claim 1, characterized in that... The E-side camera, A-side camera, C-side camera, and F-side camera are respectively mounted on the frame via a height adjustment mechanism. The height adjustment mechanism includes a bracket set on the frame, a mounting base slidably set on the bracket, and fasteners for fixing the mounting base. The camera lens is set on the mounting base.

5. A visual inspection method for wiring terminals according to claim 1, characterized in that... The visual inspection device also includes a position adjustment mechanism disposed between the B-side camera and the D-side camera. The position adjustment mechanism includes a vertically arranged vertical support, a horizontal bar slidably disposed on the vertical support, and an adjustment mounting base slidably disposed on the horizontal bars at both ends. The B-side camera and the D-side camera are respectively fixedly disposed on the corresponding adjustment mounting base.

6. A visual inspection method for terminal blocks according to claim 5, characterized in that... The position adjustment mechanism also includes an angle adjustment plate, which has an arc-shaped groove. A connector passes through the arc-shaped groove and is connected to the mounting base. The B-side camera and the D-side camera are respectively mounted on the adjustment mounting base through the angle adjustment plate.

7. A visual inspection method for wiring terminals according to claim 1, characterized in that... The rack is also equipped with a first screening mechanism behind the D-side camera and a second screening mechanism behind the F-side camera.

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