Cable appearance defect detection device

Abstract

The invention provides a cable appearance defect detection device. The cable appearance defect detection device comprises an outer wall, a camera hole, a lamp bead and a diffusion plate, the outer wall is of a regular polygon prism structure, a plurality of lamp beads are installed on the inner wall face of the outer wall, a camera hole is formed in the outer wall, diffusion plates are arranged on the sides, back to the outer wall, of the lamp beads, and the diffusion plates are connected with the two ends of the outer wall. By adopting the structural design that the outer wall of the regular 12 prism is provided with one camera hole every four edges, the uniformity of the brightness of a light source and the consistency of images acquired by each camera station can be ensured during cable appearance defect detection, a good foundation is laid for later defect identification, the defect identification difficulty is greatly reduced, and the detection efficiency is improved. And the defect identification accuracy is improved.

Description

Technical Field

[0001] The present invention relates to the field of cable detection equipment, and in particular to a cable appearance defect detection device. Background Art

[0002] Due to the cylindrical shape of the cable, it is difficult to ensure both high brightness on the cable surface and uniformity of illumination in the detection area when lighting its surface. The cable detection devices and equipment in the prior art, such as the Chinese patent with application number 202410163837.1, disclose "a cable and pipe appearance defect detection device and use method". The light source part of the device has 6 lamp beads distributed in a surrounding manner around the cable to illuminate the entire cable 360°. Because its 6 lamp beads are distributed in a surrounding manner and are not arranged in proportion, when lighting the cable surface, the uniformity of illumination in the cable detection area will be slightly poor, and the number of lamp beads is small, so the brightness of the details of subtle defects in the cable appearance will be slightly unsatisfactory. Summary of the invention

[0003] In view of the defects in the prior art, an object of the present invention is to provide a cable appearance defect detection device.

[0004] A cable appearance defect detection device provided according to the present invention comprises: an outer wall, a camera hole, a lamp bead and a diffusion plate;

[0005] The outer wall adopts a regular polygonal prism structure, a plurality of lamp beads are installed on the inner wall surface of the outer wall, a camera hole is arranged on the outer wall, a diffusion plate is arranged on the side of the lamp beads facing away from the outer wall, and the diffusion plate is connected to both ends of the outer wall.

[0006] Preferably, the diffusion plate is connected to both ends of the outer wall via a fastening device.

[0007] Preferably, a bottom loading port is provided on one side edge of the outer wall;

[0008] The diffusion plate is arranged in a ring shape and a avoiding structure is arranged at a position close to the bottom feeding port.

[0009] Preferably, the outer wall is provided with a lamp bead light-through hole, and the lamp bead is embedded in the lamp bead light-through hole.

[0010] Preferably, the diffusion plate is made of transparent material.

[0011] Preferably, the outer wall adopts a regular dodecaprism structure, and the twelve edges of the outer wall include eleven edges on which lamp beads are installed and one edge on which a bottom feeding port is provided, and a plurality of lamp beads are provided on the edges on which the lamp beads are installed.

[0012] Preferably, a camera hole is provided on every four edges of the outer wall of the regular dodecaprism, and a camera hole is provided at a corresponding position of the diffusion plate.

[0013] Preferably, the number of lamp beads on the edge with the camera hole is one less than the number of lamp beads on the edge without the camera hole.

[0014] Preferably, the plurality of lamp beads on each edge are evenly arranged, and the camera hole is located in the middle of the edge.

[0015] Preferably, the surface of the lamp bead is coated with 6-8 layers of anti-reflection film. According to the physical optics Maxwell equations, it can be deduced that:

[0016] If light passes through a 1 The medium with a refractive index of n is incident vertically 2 The medium is:

[0017] Reflectivity:

[0018] Transmittance:

[0019] The lamp bead material is optical glass, whose refractive index is 1.8 and the refractive index of air is 1.0. In the case of no coating, light enters the optical glass directly from the air. 1 =1.0,n 2 =1.8, calculate the transmittance:

[0020]

[0021] If it is emitted from the optical glass and then returns to the air, then n 1 =1.8,n 2 =1.0, transmittance:

[0022]

[0023] When the refractive index of the anti-reflection film is n=1.5, the light actually undergoes two refractions when it enters the glass: air → coating → glass, and the same is true when it exits.

[0024] Transmittance when entering glass:

[0025]

[0026] Transmittance at output:

[0027]

[0028] Before and after coating, the light transmittance increased from 84.3% to 90.6%, and the amount of emitted light increased by 6.3%. Each lamp bead was brightened by 6.3% at the same time, which greatly improved the overall brightness of the light source and had a better effect on highlighting the details of minor defects.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] 1. This application adopts the outer wall of a regular twelve-column prism and a structural design in which a camera hole is opened on every four edges. This ensures the uniformity of the light source brightness and the consistency of the images collected by each camera station during cable appearance defect detection, laying a good foundation for later defect identification, greatly reducing the difficulty of defect identification and improving the accuracy of defect identification.

[0031] 2. This application significantly improves the transmittance of the lamp beads and reduces the attenuation of light by coating the lamp beads with an anti-reflection film. Without increasing the power consumption of the lamp beads, the brightness of the overall light source is increased. The identification of some minor scratches, breakages and other defects on the appearance of some cables is clearer and more accurate, which reduces a lot of time for post-image processing and reduces the difficulty of algorithm recognition. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0033] Figure 1 It is the overall structural schematic diagram of the detection device (I);

[0034] Figure 2 It is the overall structural schematic diagram of the detection device (II);

[0035] Figure 3 It is a front view of the detection device;

[0036] Figure 4 It is a schematic diagram of the main view of the outer wall structure;

[0037] Figure 5 It is a three-dimensional schematic diagram of the outer wall structure;

[0038] Figure 6 is a schematic diagram of the end face of the outer wall structure and the diffuser plate;

[0039] As shown in the figure:

[0040] DETAILED DESCRIPTION

[0041] The present invention is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those of ordinary skill in the art, several changes and improvements can also be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0042] Example 1

[0043] like Figure 1-3 As shown, this embodiment includes: an outer wall 101, a camera hole 102, a lamp bead light hole 103, a bottom loading port 104, a lamp bead 105, a fastening device 106 and a diffusion plate 107;

[0044] The outer wall 101 adopts a regular polygonal prism structure, and a plurality of lamp beads 105 are installed on the inner wall surface of the outer wall 101. A camera hole 102 and a lamp bead light hole 103 are provided on the outer wall 101. A bottom loading port 104 is provided on one edge of the outer wall 101. A diffusion plate 107 is provided on the side of the lamp bead 105 facing away from the outer wall 101, and the diffusion plate 107 is connected to both ends of the outer wall 101 by a fastening device 106.

[0045] The lamp bead light-through hole 103 is located on the outer wall 101, and a lamp bead 105 is embedded in each lamp bead light-through hole 103. The lamp bead light-through hole 103 is used to embed and fix the lamp bead 105 on the outer wall 101, so that the lamp bead 105 emits light stably without deviation.

[0046] In one embodiment, the diffusion plate 107 is configured to be annular and a avoidance structure is provided at a position close to the bottom feeding port 104 . The diffusion plate 107 is made of highly transparent material.

[0047] In one embodiment, the surface of the lamp bead 105 is coated with 6-8 layers of anti-reflection film.

[0048] Combination Figure 4-6As shown, in this embodiment, the outer wall 101 adopts a regular twelve-sided prism structure, and the twelve edges of the outer wall 101 include eleven edges on which lamp beads 105 are installed and one edge on which a bottom loading port 104 is provided, and a plurality of lamp beads 105 are provided on the edges on which the lamp beads 105 are installed. Putting in 11 rows of lamp beads 105 can increase the luminous area and brightness, and the arrangement of the lamp beads 105 in a regular twelve-sided shape also ensures the uniformity of the light source. At the same time, a multi-layer anti-reflection film is plated on the surface of the lamp beads 105, which significantly increases the transmittance of the light emitted by the lamp beads, thereby increasing the light emission of the lamp beads 105, and further improving the overall brightness of the light source, which can better highlight the subtle defects and details. A camera hole 102 is provided on every four edges of the outer wall 101 of the regular dodecahedron, and the number of lamp beads 105 on the edges with the camera holes 102 is one less than the number of lamp beads 105 on the edges without the camera holes 102. The camera holes 102 are provided at the corresponding positions of the diffuser plate 107 to avoid obstruction of the camera shooting by the diffuser plate 107.

[0049] In one embodiment, the plurality of lamp beads 105 on each edge are evenly arranged, and the camera hole 102 is located in the middle of the edge.

[0050] Example 2

[0051] Example 2 is a preferred example of Example 1.

[0052] like Figure 1-6 As shown, this embodiment includes: an outer wall 101, lamp beads 105, a fastening device 106, and a diffuser plate 107; 11 rows of lamp beads 105 are installed on the inner surface of the outer wall 101, and a camera hole 102 is opened at the center of each of the four edges for camera photography. The hole position of the camera hole 102 is designed as a round hole, which can be used with both a planar array camera and a line scan camera. Synchronously, a camera hole 102 is also opened at the corresponding position of the diffuser plate 107 to prevent the diffuser plate 107 from blocking the camera's field of view, and then the fastening device 106 is used to fasten the outer wall 101 and the diffuser plate 107, thereby fixing the diffuser plate 107. Cable materials can be delivered from both sides, or loaded from the bottom loading port 104. When the lamp beads 105 are lit, the camera can take pictures from the camera hole 102.

[0053] The outer wall 101 is designed as a 12-prism structure, and the camera hole 102 is opened on every four edges, which ensures the uniformity of the brightness of the light source, and the brightness of the shooting area at the three camera holes 102 is consistent. A diffusion plate 107 is added to the surface of the lamp bead 105 to reduce the scattered stray light emitted by the lamp bead 105 and the reflection between the lamp bead 105 and the aligned lamp bead 105, further increasing the uniformity of the entire light source illumination. At the same time, the diffusion plate 107 uses a highly transparent material, thereby reducing the loss of the overall light emission of the light source due to the existence of the diffusion plate 107.

[0054] More specifically, the lamp beads 105 themselves use high-power lamp beads, and at least 10 are arranged in each row, and 11 are arranged on the edges without the camera hole 102, which greatly enhances the brightness of the overall light source. At the same time, 6-8 layers of anti-reflection film are plated on the surface of each lamp bead 105 (the reason for coating 6-8 layers of film is that the wavelengths and refractive indices of different colors of light are different. In order to ensure the imaging effect of different light, it is necessary to plate multiple layers of anti-reflection film to balance the chromatic aberration of light). According to the derivation of Maxwell's equations of physical optics, it can be known that:

[0055] If light passes through a 1 The medium with a refractive index of n is incident vertically 2 For the medium, we have:

[0056] Reflectivity:

[0057] Transmittance:

[0058] The material of lamp bead 105 is optical glass, whose refractive index is 1.8 and the refractive index of air is 1.0. In the case of no coating, light directly enters the optical glass from air. 1 =1.0,n 2 =1.8, calculate the transmittance:

[0059]

[0060] If it is emitted from the optical glass and then returns to the air, then n 1 =1.8,n 2 =1.0, transmittance:

[0061]

[0062] In the case of coating (anti-reflection film refractive index n = 1.5):

[0063] Because of the coating, the light actually undergoes two refractions when it enters the glass: air → coating → glass, and the same is true when it exits.

[0064] Transmittance when entering glass:

[0065]

[0066] Transmittance at output:

[0067]

[0068] Before and after coating, the light transmittance increased from 84.3% to 90.6%, and the amount of emitted light increased by 6.3%. Each lamp bead 105 was brightened by 6.3% at the same time, which greatly improved the overall brightness of the light source and had a better brightening effect on the details of minor defects.

[0069] In the description of the present application, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0070] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which does not affect the essence of the present invention. In the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other arbitrarily.

Claims

1. A cable appearance defect detection device, characterized in that: include: An outer wall (101), a camera hole (102), a lamp bead (105) and a diffusion plate (107); The outer wall (101) adopts a regular polygonal prism structure, a plurality of lamp beads (105) are installed on the inner wall surface of the outer wall (101), a camera hole (102) is provided on the outer wall (101), a diffusion plate (107) is provided on the side of the lamp beads (105) facing away from the outer wall (101), and the diffusion plate (107) is connected to both ends of the outer wall (101).

2. The cable appearance defect detection device according to claim 1, characterized in that: The diffusion plate (107) is connected to both ends of the outer wall (101) via fastening devices (106).

3. The cable appearance defect detection device according to claim 1, characterized in that: A bottom loading port (104) is provided on one side edge of the outer wall (101); The diffusion plate (107) is arranged in a ring shape and a avoiding structure is arranged at a position close to the bottom feeding port (104).

4. The cable appearance defect detection device according to claim 1, characterized in that: The outer wall (101) is provided with a lamp bead light-through hole (103), and the lamp bead (105) is embedded in the lamp bead light-through hole (103).

5. The cable appearance defect detection device according to claim 1, characterized in that: The diffusion plate (107) is made of transparent material.

6. The cable appearance defect detection device according to claim 1, characterized in that: The surface of the lamp bead (105) is plated with 6 to 8 layers of anti-reflection film.

7. The cable appearance defect detection device according to claim 1, characterized in that: The outer wall (101) adopts a regular twelve-prism structure, and the twelve edges of the outer wall (101) include eleven edges on which lamp beads (105) are installed and one edge on which a bottom loading port (104) is provided, and a plurality of lamp beads (105) are provided on the edges on which the lamp beads (105) are installed.

8. The cable appearance defect detection device according to claim 7, characterized in that: A camera hole (102) is provided on every four edges of the outer wall (101) of the regular dodecagonal prism, and a camera hole (102) is provided at a corresponding position of the diffusion plate (107).

9. The cable appearance defect detection device according to claim 8, characterized in that: The number of lamp beads (105) on the edge with the camera hole (102) is one less than the number of lamp beads (105) on the edge without the camera hole (102).

10. The cable appearance defect detection device according to claim 1, characterized in that: The plurality of lamp beads (105) on each edge are evenly arranged, and the camera hole (102) is located in the middle of the edge.

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