Capacitor appearance detection method

Abstract

The invention relates to the technical field of appearance detection, in particular to a capacitor appearance detection method, which comprises the following steps of: selecting a proper light source to irradiate a to-be-detected surface of a capacitor according to different positions of the to-be-detected capacitor at a detection station, and controlling an angle between the light source and the to-be-detected surface of the capacitor to form a proper lighting image; an image after lighting and imaging is reflected into the camera assembly through the reflection lenses, an image of a to-be-detected surface of the capacitor is collected, and the light source and the multiple reflection lenses are arranged around the to-be-detected surface of the capacitor and cover the to-be-detected surface of the capacitor by 360 degrees in the circumferential direction of the capacitor; according to the invention, the imaging of the capacitor at each angle is reflected to the camera assembly for shooting through the reflection lens, the 360-degree appearance information of the capacitor can be collected at the same time, the capacitor does not need to be subjected to rotary shooting, the structure is simple, the efficiency is high, and the posture and imaging of the capacitor are stable.

Description

Technical Field

[0001] The present invention relates to the technical field of appearance detection, and in particular to a capacitance appearance detection method. Background Art

[0002] During the production and turnover of capacitors, the appearance of capacitors is prone to defects, such as dirt, foreign matter, deformation, scratches or damage. It is usually necessary to inspect the appearance of capacitors to eliminate defective products. Currently, existing image detection systems can use cameras to take pictures of capacitors and analyze the pictures to see if there are any defects in the appearance of the capacitors. However, when only setting up an image detection system to collect pictures, it is generally used to directly place the capacitors on the conveyor belt to take pictures. It is impossible to detect multiple positions of the capacitors. In addition, the camera is prone to focusing errors, making it difficult to identify defective appearances, resulting in low accuracy in the appearance inspection of capacitors.

[0003] The existing solution is to use multiple processes to perform appearance inspections on different positions of the capacitor and complete inspections of the capacitor at multiple angles by rotating the capacitor. However, this method requires the capacitor to be rotated and the capacitor to be inspected while in motion, resulting in unstable capacitor posture and poor imaging effect. In addition, the efficiency of capacitor inspection is low, the mechanical structure is complex, and the cost is high.

[0004] Based on this, it is urgent to invent a capacitance appearance detection method to solve the above technical problems. Summary of the Invention

[0005] One of the purposes of the present invention is to address the deficiencies of the prior art and provide a capacitor appearance inspection method that can inspect the capacitor at 360° multi-angles while keeping the capacitor in a stationary state for inspection, with high inspection efficiency and a high recognition rate for appearance defects.

[0006] To solve the above technical problems, this application adopts the following technical solutions:

[0007] A method for detecting the appearance of a capacitor is provided, comprising the following steps:

[0008] S1. Install multiple capacitors on the clamping and rotating mechanism, pass through different inspection stations in sequence along the rotation path of the clamping and rotating mechanism, and control the clamping and rotating mechanism so that the capacitors rotate to the inspection station and stop for a period of time for inspection;

[0009] S2. At the detection station, according to the position of the capacitor to be detected, a suitable light source is selected to illuminate the surface of the capacitor to be detected, and the angle between the light source and the surface of the capacitor to be detected is controlled to form a suitable lighting image. The image after lighting imaging is reflected to the camera component through a reflective lens, and an image of the surface of the capacitor to be detected is collected, wherein the light source and multiple reflective lenses are arranged around the surface of the capacitor to be detected and cover the surface of the capacitor to be detected 360 degrees along the circumference of the capacitor;

[0010] S3. After passing the inspection station, identify whether the capacitor is defective based on the obtained image of the capacitor test surface, and use a sorting mechanism to sort the capacitor.

[0011] Furthermore, in step S1, the detection station is provided with an avoidance groove, through which the capacitor can enter the center of the detection station by rotating the clamping rotation mechanism.

[0012] Furthermore, in step S1, the detection station includes at least any one of a body station, a character station, a safety valve station and a tip station.

[0013] Furthermore, at the main body workstation, the camera assembly is vertically mounted on the top of the capacitor, the light source is a coaxial annular parallel light source, and the angle between the coaxial annular parallel light source and the side surface of the capacitor is between 2° and 15°.

[0014] Furthermore, at the character workstation, the camera assembly is vertically mounted on the top of the capacitor, the light source is a columnar light source, the columnar light source surrounds the character surface of the capacitor, and the inner wall surface of the columnar light source is perpendicular to the character surface of the capacitor.

[0015] Furthermore, at the safety valve station, the camera assembly is vertically mounted on the top of the capacitor, the light source is a coaxial annular parallel light source, and the angle between the coaxial annular parallel light source and the surface of the capacitor safety valve is between 2° and 15°.

[0016] Furthermore, at the skin tip working station, the camera assembly is vertically mounted on the top of the capacitor, the light source is a columnar light source, the columnar light source is arranged around the skin tip of the capacitor, and the inner wall surface of the columnar light source is perpendicular to the skin tip of the capacitor.

[0017] Furthermore, the reflective lens is arranged on the top of the columnar light source, and the angles between the reflective lens and the capacitor tip of some of the reflective lenses are different.

[0018] Furthermore, step S1 also includes adjusting the angle between the reflective lens and the capacitor so that the camera component avoids the angle range of the reflected light reflected by the mirror.

[0019] Furthermore, in step S3, the sorting mechanism also includes a material collection box and a good product unloading structure, the material clamping and rotating mechanism includes a material clamping structure, a rotating structure and a driving component, and the material clamping structure is provided with a plurality of grippers. When the capacitor is identified as defective, the gripper moves to the top of the material collection box and releases the capacitor. When the capacitor is identified as good, the gripper moves to the top of the good product unloading structure and releases it. When the gripper moves to the loading area, the gripper clamps the capacitor for loading.

[0020] The beneficial effects of the present invention are: the present application uses a reflective lens to simultaneously reflect the imaging of the capacitor at various angles to the camera component for shooting, and can simultaneously collect 360° appearance information of the capacitor without rotating the capacitor. The shooting structure is simple and efficient, and the capacitor posture is stable and the imaging is stable; the present application rotates the capacitor and makes the clamping rotation mechanism pass through different detection stations during the rotation process, and sets different angles between the light source and the capacitor surface to be tested according to different appearance detection requirements of the capacitor to form suitable lighting imaging. There is no need to further adjust the capacitor posture to complete the detection of multiple positions of the capacitor, and the capacitor detection efficiency is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0022] Figure 1 This is one of the structural diagrams of the present invention;

[0023] Figure 2 This is the second structural diagram of the present invention;

[0024] Figure 3 This is the third structural diagram of the present invention;

[0025] Figure 4 This is a schematic diagram of the main station structure of the present invention;

[0026] Figure 5 This is a schematic diagram of the character station structure of the present invention;

[0027] Figure 6 This is a schematic diagram of the safety valve working position structure of the present invention;

[0028] Figure 7 This is a schematic diagram of the tip working station structure of the present invention;

[0029] Figure 8 This is an imaging diagram of the main body working station of the present invention.

[0030] Among them: 1-mounting base; 11-fixed frame; 12-movable plate; 2-clamping and rotating mechanism; 21-clamping structure; 22-rotating structure; 23-driving component; 3-detection station; 31-light source; 311-coaxial annular parallel light source; 312-columnar light source; 32-camera assembly; 33-reflective lens; 34-avoidance groove; 35-body station; 36-character station; 37-safety valve station; 38-slip head station; 4-sorting mechanism; 41-collection box; 42-good product unloading structure. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by technicians in the technical field of the present application. The terms used herein in the specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application.

[0032] like Figure 1-3 As shown, the present application provides a capacitance appearance detection method, comprising the following steps:

[0033] S1. Install multiple capacitors on the clamping and rotating mechanism 2, pass through different detection stations 3 in sequence along the rotation path of the clamping and rotating mechanism 2, and control the clamping and rotating mechanism 2 so that the capacitors rotate to the detection station 3 and stop for a period of time for detection;

[0034] S2. At the detection station 3, a suitable light source 31 is selected to illuminate the surface of the capacitor to be detected according to the position of the capacitor to be detected, and the angle between the light source 31 and the surface of the capacitor to be detected is controlled to form a suitable lighting image. The image after lighting imaging is reflected by the reflective lens 33 to the camera assembly 32, and the image of the surface of the capacitor to be detected is collected. The light source 31 and the multiple reflective lenses 33 are all arranged around the surface of the capacitor to be detected and cover the surface of the capacitor to be detected 360 degrees along the circumference of the capacitor;

[0035] S3. After passing the detection station 3, the capacitor is identified as defective based on the obtained image of the capacitor surface to be tested, and the capacitor is sorted using the sorting mechanism 4.

[0036] The applicant has found that in the existing appearance inspection equipment, in order to ensure that the capacitor can be inspected at multiple angles, the capacitor needs to be photographed and inspected during the rotation process. However, since the capacitor remains in a moving state during the inspection, the capacitor is unstable, which leads to instability in the imaging of the capacitor. Moreover, since the camera is required to be kept in a moving state for imaging, the inventor has used a reflective lens 33 to reflect the viewing angles of the capacitor at multiple angles to the camera through a reflector, so that the camera can capture views of the capacitor at multiple angles. Therefore, the capacitor can be photographed at multiple angles without rotating it, which allows the camera to shoot from motion. By changing to still shooting, images at all angles are captured at the same time, eliminating image registration errors and time delays caused by capacitor movement or rotation, making the camera's imaging of the capacitor more stable and having a high recognition rate for poor appearance. Moreover, since the capacitor rotation structure 22 is omitted, the overall structure is simpler. By only setting up a clamping rotation mechanism 2 and arranging the inspection stations 3 along the rotation direction, the overall capacitor transportation and capacitor posture fixation functions can be completed. Moreover, due to the capacitor shooting process, this application only needs to take a still picture to complete the shooting requirements, and there is no need to shoot the entire capacitor rotation process, which improves the efficiency of capacitor appearance detection.

[0037] Since different positions of the capacitor detection require different types of defective detection, different detection focuses are required, such as detecting scratches, dirt, side bursts, and side concave on the body; identifying characters on the capacitor body and detecting character integrity; detecting safety valve patterns, scratches, marks, dirt, concave, convex / R-angle holes; detecting leather head patterns, dirt, breakage, concave, oblique / R-angle holes, etc. By adjusting the type of light source 31 and the angle between the light source 31 and the capacitor, different types of capacitor defects can be detected without adjusting the capacitor posture, thereby improving the efficiency of capacitor detection.

[0038] The method of identifying bad capacitors on the surface to be tested is to compare the image of a good capacitor with the image of the surface to be tested, and to identify the damaged capacitors by marking the ones with the largest difference in structural grayscale value as bad ones.

[0039] Preferably, in step S1, the detection station 3 is provided with an avoidance groove 34, through which the capacitor can enter the center of the detection station 3 through the rotation of the clamping rotating mechanism 2, so that the capacitor can enter the center of the detection station 3 to improve the accuracy of capacitance detection.

[0040] Preferably, in step S1, the inspection station 3 includes at least any one of the main body station 35, the character station 36, the safety valve station 37 and the tip station 38. The main body station 35, the character station 36, the safety valve station 37 and the tip station 38 can be freely combined according to the items required for the capacitor appearance inspection.

[0041] like Figure 4 and Figure 8 As shown, at the main body station 35, the camera assembly 32 is vertically mounted on the top of the capacitor, and the light source 31 is a coaxial annular parallel light source 311. The angle between the coaxial annular parallel light source 311 and the side of the capacitor is between 2° and 15°. This inclination can ensure that the laser beam is almost swept across the capacitor, so that scratches, dirt, side explosions, and side concave have strong light and dark boundaries and long shadows, while maintaining a sufficiently wide lighting coverage area. An angle that is too low may cause the shadow to be overly elongated and distorted. An angle that is too high will weaken the shadow length and contrast, gradually approaching the ordinary top light lighting effect, and the recognition ability is greatly reduced.

[0042] like Figure 5 As shown, at the character station 36, the camera assembly 32 is vertically mounted on the top of the capacitor, and the light source 31 is a columnar light source 312. The columnar light source 312 surrounds the character surface of the capacitor, and the inner wall surface of the columnar light source 312 is perpendicular to the character surface of the capacitor, so that the light is evenly irradiated on the material body and refracted on the inner wall, reducing shadows and reducing the influence of side textures such as unevenness, thereby improving the detection accuracy of characters. The preferred number of reflective lenses 33 is 6 or more, and setting more lenses can reduce the distortion of characters.

[0043] like Figure 6 As shown, at the safety valve station 37, the camera assembly 32 is vertically mounted on the top of the capacitor, and the light source 31 is a coaxial annular parallel light source 311. The angle between the coaxial annular parallel light source 311 and the surface of the capacitor safety valve is between 2° and 15°, which can maintain accurate detection of different positions of the capacitor.

[0044] like Figure 7 As shown, at the skin tip station 38, the camera assembly 32 is vertically mounted on the top of the capacitor, and the light source 31 is a columnar light source 312. The columnar light source 312 is arranged around the skin tip of the capacitor, and the inner wall surface of the columnar light source 312 is perpendicular to the skin tip of the capacitor. This arrangement can reduce shadows and reduce misjudgment of the skin tip structure.

[0045] Preferably, the reflective lens 33 is arranged on the top of the cylindrical light source 312, and the angles between the reflective lens 33 and the skin head of the capacitor of some reflective lenses 33 are different. The skin head is a structure that connects the top of the capacitor to the external circuit, and generally has a three-dimensional structure. Detecting the skin head requires the skin head to be detected without blind angles. Therefore, by setting multiple reflective lenses 33 at different angles, the detection blind angles can be reduced. Preferably, the reflective lenses 33 are set to 6 or more. Since reflective lenses 33 at multiple angles are required, more lenses need to be set to ensure 360° detection.

[0046] Preferably, step S1 also includes adjusting the angle between the reflective lens 33 and the capacitor so that the camera assembly 32 avoids the angle range of the reflected light reflected by the mirror. This setting can reduce the interference of reflections on the appearance defect detection and improve the detection accuracy.

[0047] Preferably, in step S3, the sorting mechanism 4 also includes a material collection box 41 and a good product unloading structure 42, and the material clamping and rotating mechanism 2 includes a material clamping structure 21, a rotating structure 22 and a driving component 23. The material clamping structure 21 is provided with multiple grippers. When the capacitor is identified as defective, the gripper moves to the top of the material collection box 41 to release the capacitor. When the capacitor is identified as good, the gripper moves to the top of the good product unloading structure 42 to release it. When the gripper moves to the loading area, the gripper clamps the capacitor for loading. Preferably, the distance between different grippers of the capacitor matches the distance between different detection stations 3, so that each time the rotation stops for photo detection, there is a capacitor on each detection station 3 for detection to form an assembly line.

[0048] The foregoing description shows and describes several preferred embodiments of the present invention. However, as previously mentioned, it should be understood that the present invention is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. Rather, the present invention may be used in various other combinations, modifications, and environments and may be modified within the scope of the present invention through the teachings above or through techniques or knowledge in the relevant art. Modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention are intended to be within the scope of the appended claims.

Claims

1. A capacitance appearance detection method, characterized in that: The following steps are involved: S1. Install multiple capacitors on a material clamping rotating mechanism (2), pass through different detection stations (3) in sequence along the rotation path of the material clamping rotating mechanism (2), and control the material clamping rotating mechanism (2) so that the capacitors rotate to the detection station (3) and then stop for a period of time for detection; S2, at the detection station (3), according to the different positions of the capacitor to be detected, a suitable light source (31) is selected to illuminate the surface of the capacitor to be detected, and the angle between the light source (31) and the surface of the capacitor to be detected is controlled to form a suitable lighting image, and the image after the lighting image is reflected to the camera component (32) through the reflective lens (33), and the image of the surface of the capacitor to be detected is collected, wherein the light source (31) and the plurality of reflective lenses (33) are arranged around the surface of the capacitor to be detected and cover the surface of the capacitor to be detected 360 degrees along the circumference of the capacitor; S3. After passing the detection station (3), the capacitor is identified as defective based on the obtained image of the capacitor test surface, and the capacitor is sorted using a sorting mechanism (4).

2. The capacitance appearance detection method according to claim 1, wherein: In step S1, the detection station (3) is provided with an avoidance groove (34), through which the capacitor can enter the center of the detection station (3) through the rotation of the clamping rotating mechanism (2).

3. The capacitance appearance detection method according to claim 2, wherein: In step S1, the detection station (3) includes at least any one of the body station (35), the character station (36), the safety valve station (37) and the tip station (38).

4. The capacitance appearance detection method according to claim 3, wherein: At the main body station (35), the camera assembly (32) is vertically mounted on the top of the capacitor, the light source (31) is a coaxial annular parallel light source (311), and the angle between the coaxial annular parallel light source (311) and the side surface of the capacitor is between 2° and 15°.

5. The capacitance appearance detection method according to claim 3, wherein: At the character station (36), the camera assembly (32) is vertically mounted on the top of the capacitor, the light source (31) is a columnar light source (312), the columnar light source (312) surrounds the character surface of the capacitor, and the inner wall surface of the columnar light source (312) is perpendicular to the character surface of the capacitor.

6. The capacitance appearance detection method according to claim 3, wherein: At the safety valve station (37), the camera assembly (32) is vertically mounted on the top of the capacitor, the light source (31) is a coaxial annular parallel light source (311), and the angle between the coaxial annular parallel light source (311) and the surface of the capacitor safety valve is between 2° and 15°.

7. The capacitance appearance detection method according to claim 3, wherein: At the skin tip station (38), the camera assembly (32) is vertically mounted on the top of the capacitor, the light source (31) is a columnar light source (312), and the columnar light source (312) is arranged around the skin tip of the capacitor, and the inner wall surface of the columnar light source (312) is perpendicular to the skin tip of the capacitor.

8. The capacitance appearance detection method according to claim 7, characterized in that: The reflective lens (33) is arranged on the top of the columnar light source (312), and the included angles between the reflective lens (33) and the skin tip of the capacitor are different in some of the reflective lenses (33).

9. The capacitance appearance detection method according to claim 1, wherein: Step S1 also includes adjusting the angle between the reflective lens (33) and the capacitor so that the camera component (32) avoids the angle range of the reflected light reflected by the mirror.

10. The capacitance appearance detection method according to claim 1, wherein: In step S3, the sorting mechanism (4) further includes a material collection box (41) and a good product unloading structure (42), and the material clamping and rotating mechanism (2) includes a material clamping structure (21), a rotating structure (22) and a driving component (23). The material clamping structure (21) is provided with a plurality of grippers. When the capacitor is identified as defective, the grippers move to the top of the material collection box (41) to release the capacitor. When the capacitor is identified as good, the grippers move to the top of the good product unloading structure (42) to release. When the grippers move to the loading area, the grippers clamp the capacitor for loading.

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