Visual inspection system

Abstract

The utility model discloses a visual inspection system. Visual inspection includes: a light source assembly including a support member and a plurality of light emitting units, the support member is in a bowl shape capable of covering an object to be detected, the concave surface of the bowl-shaped support member faces the object to be detected, the center position of the support member is provided with a through hole, and the plurality of light emitting units are attached to the concave surface and arranged around the through hole; the detection camera is arranged at the through hole; the control assembly is electrically connected with the light-emitting units and the detection camera, each light-emitting unit can emit light independently, and the detection camera can obtain a corresponding image of the to-be-detected object when any light-emitting unit emits light. And the control assembly is configured to detect the surface defects of the object to be detected based on the image acquired by the detection camera. According to the visual inspection system disclosed by the embodiment of the utility model, the accuracy and the detection rate of surface defect detection of the object to be detected are improved.

Description

Technical Field

[0001] The utility model relates to the field of visual inspection, and particularly relates to a visual inspection system. Background Art

[0002] In the process of battery manufacturing, it is necessary to perform surface defect detection on some finished or semi-finished products of components. For example, surface defect detection is performed on a semi-finished battery having a substantially metal hexahedron structure. Since the occurrence positions of surface defects of the semi-finished battery are highly random, in the prior art, the defect detection effect of an image obtained under a single-angle light source lighting state is poor. Summary of the Utility Model

[0003] The utility model provides a visual inspection system, which further improves the accuracy of surface defect detection of a to-be-detected object.

[0004] An embodiment of the utility model provides a visual inspection system, which includes: a light source assembly, including a support member and a plurality of light-emitting units, the support member being in a bowl shape capable of covering the to-be-detected object, wherein the concave surface of the bowl-shaped support member faces the to-be-detected object, a through hole is provided at the central position of the support member, and the plurality of light-emitting units are attached to the concave surface and arranged around the through hole; a detection camera, arranged at the through hole; and a control component, electrically connected to the plurality of light-emitting units and the detection camera, each light-emitting unit being capable of emitting light independently, the detection camera being capable of obtaining a corresponding image of the to-be-detected object when any of the light-emitting units emits light, and the control component being configured to detect surface defects of the to-be-detected object based on the image obtained by the detection camera.

[0005] According to the visual inspection system of the embodiment of the utility model, its light source assembly includes a bowl-shaped support member and a plurality of light-emitting units, a through hole is provided at the central position of the support member, and the plurality of light-emitting units are attached to the concave surface of the support member facing the to-be-detected object and arranged around the through hole. When the support member covers the to-be-detected object, the plurality of light-emitting units are arranged around the periphery of the to-be-detected object, and each light-emitting unit is located at a different position in the circumferential direction of the to-be-detected object. The detection camera is arranged at the through hole, so as to be able to obtain an image of the to-be-detected object through the through hole. In the visual inspection system of the embodiment of the utility model, each light-emitting unit can emit light independently. When performing visual inspection on the to-be-detected object, corresponding images can be obtained when the light-emitting units at different positions in the circumferential direction of the to-be-detected object emit light, and the control component can analyze and identify surface defects of the to-be-detected object based on the plurality of images corresponding to the light-emitting units emitting light in the above different directions, thereby greatly improving the accuracy and detection rate of surface defect detection of the to-be-detected object.

[0006] According to the foregoing embodiments of the first aspect of the present utility model, each of the light-emitting units extends from the through-hole in a direction away from the center of the through-hole, and each of the light-emitting units is arranged in an arc shape. In the above embodiments, each light-emitting unit extends from the through-hole in a direction away from the center of the through-hole, so that each light-emitting unit has a relatively long actual light-emitting area, which is convenient for improving the irradiation effect of the light-emitting units on the object to be measured when each light-emitting unit emits light, thereby improving the quality of the acquired image.

[0007] According to any one of the foregoing embodiments of the first aspect of the present utility model, each of the light-emitting units includes a plurality of light-emitting elements. The plurality of light-emitting elements are arranged from the through-hole in a direction away from the center of the through-hole, and as the light-emitting elements gradually move away from the through-hole, the angle between the light-emitting direction of the light-emitting elements and the plane where the object to be measured is located gradually decreases. In the above embodiments, each light-emitting unit includes light-emitting elements with various light-emitting directions, so that when each light-emitting unit emits light, the object to be measured can be irradiated from multiple angular directions, thereby further improving the detection rate of surface defects of the object to be measured.

[0008] According to any one of the foregoing embodiments of the first aspect of the present utility model, each of the light-emitting units includes at least two light-emitting subunits arranged in sequence from the through-hole in a direction away from the center of the through-hole. Each of the light-emitting subunits can emit light independently and is electrically connected to the control component. In the above embodiments, each light-emitting unit further includes at least two light-emitting subunits. Each light-emitting subunit can emit light independently and is electrically connected to the control component. When performing visual inspection on the object to be measured, in addition to being able to obtain corresponding images in different directions based on the light emission of the light-emitting units at different circumferential positions of the object to be measured, corresponding images at different angles can also be obtained based on the light emission of different light-emitting subunits within the same light-emitting unit. The control component can analyze and identify the surface defects of the object to be measured based on the multiple images corresponding to different directions and the images corresponding to different angles, thereby further improving the accuracy of surface defect detection of the object to be measured.

[0009] According to any one of the foregoing embodiments of the first aspect of the present utility model, at least one of the light-emitting units includes a plurality of light-emitting elements of various colors, and each of the light-emitting elements is electrically connected to the control component. In the above embodiments, at least one light-emitting unit includes light-emitting elements of various colors. Therefore, when performing visual inspection on the object to be measured, corresponding images in different color fill light states can also be obtained based on the emission of different colors of light by the light-emitting unit. The control component can perform further surface defect identification based on the multiple images corresponding to different color fill light states, thereby being able to further improve the defect detection effect.

[0010] According to any of the aforementioned embodiments of the first aspect of the utility model, the plurality of light-emitting elements of multiple colors include red light-emitting elements, green light-emitting elements, and blue light-emitting elements. In the above embodiments, by controlling the light-emitting brightness of the red light-emitting elements, the green light-emitting elements, and the blue light-emitting elements, actual light-emitting effects of various colors can be mixed, thereby facilitating the visual inspection system to adapt to the surface defect detection of objects to be tested with different appearance colors.

[0011] According to any of the aforementioned embodiments of the first aspect of the utility model, the control component includes a light source controller electrically connected to the multiple light-emitting units, and the light source controller is configured to be able to control the light-emitting sequence of the multiple light-emitting units.

[0012] According to any of the aforementioned embodiments of the first aspect of the utility model, the light source controller is configured to be able to control the light luminance of each of the light emitting units. In the above embodiments, when visually inspecting the object to be tested, it is also possible to obtain corresponding multiple images based on the light emitting units generating different brightness fill light states, and the control component can further identify surface defects based on the corresponding multiple images under the brightness fill light state, thereby further improving the defect detection effect.

[0013] According to any of the aforementioned embodiments of the first aspect of the utility model, the light source assembly further comprises a diffuse reflection plate, and the diffuse reflection plate is arranged on the peripheral side of each of the light-emitting units and / or the bottom side of each of the light-emitting units facing the support member. In the above embodiment, a diffuse reflection plate is adapted to be provided at the light-emitting unit, and the diffuse reflection plate can diffusely reflect the light irradiated in a direction away from the object to be measured toward the object to be measured, thereby improving the quality of the image obtained when the light-emitting unit emits light.

[0014] According to any of the aforementioned embodiments of the first aspect of the utility model, the detection camera includes an image sensor, a lens disposed on the side of the image sensor facing the object to be detected, and a polarizer installed on the lens. In the above embodiments, the polarizer can filter light, and when the image sensor acquires an image of the object to be detected, the polarizer will partially interfere with the light filtering process, thereby obtaining an image that can more accurately reflect surface defects and improve the accuracy of surface defect detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0016] Figure 1 Schematic cross-sectional structure diagram of an embodiment of the vision detection system of the present utility model;

[0017] Figure 2 Bottom view schematic diagram of the light source assembly in an embodiment of the vision detection system of the present utility model;

[0018] Figure 3 Schematic cross-sectional structure diagram of an alternative embodiment of the vision detection system of the present utility model;

[0019] Figure 4 Bottom view schematic diagram of the light source assembly in an alternative embodiment of the vision detection system of the present utility model.

[0020] Explanation of reference numerals:

[0021] 100 - Light source assembly; 110 - Support member; 111 - Through hole; 120 - Light emitting unit; 120s - Light emitting sub-unit; 121 - Light emitting element;

[0022] 200 - Detection camera; 210 - Image sensor; 220 - Lens; 230 - Polarizing plate;

[0023] 300 - Control assembly;

[0024] 900 - Object to be measured.

[0025] The realization, functional features and advantages of the purpose of the present utility model will be further described in conjunction with the embodiments and with reference to the accompanying drawings. Detailed implementation manners

[0026] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0027] It should be noted that all directional indications such as up, down, left, right, front, back... in the embodiments of the present utility model are only used to explain the relative position relationship and movement conditions between components in a specific posture as shown in the accompanying drawings. If this specific posture changes, then the directional indications will also change accordingly.

[0028] In addition, the descriptions involving "first", "second", etc. in the present utility model are for descriptive purposes only, and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions between various embodiments may be combined with each other, but it must be based on the realization by those of ordinary skill in the art. When the combination of technical solutions is contradictory or unable to be realized, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present utility model.

[0029] Figure 1 It is a schematic cross-sectional structure view of an embodiment of the visual inspection system of the present utility model. The visual inspection system includes a light source assembly 100, a detection camera 200, and a control assembly 300. The light source assembly 100 includes a support member 110 and a plurality of light-emitting units 120. Figure 2 It is a bottom view schematic of the light source assembly in an embodiment of the visual inspection system of the present utility model. The support member 110 is in a bowl shape that can cover the object to be measured, and the concave surface of the bowl-shaped support member 110 faces the object to be measured 900. A through hole 111 is provided at the central position of the support member 110, and a plurality of light-emitting units 120 are attached to the concave surface and arranged around the through hole 111.

[0030] The detection camera 200 is disposed at the through hole 111. The control assembly 300 is electrically connected to the plurality of light-emitting units 120 and the detection camera 200. Each light-emitting unit 120 can emit light independently. The detection camera 200 can obtain a corresponding image of the object to be measured 900 when any light-emitting unit 120 emits light. The control assembly 300 is configured to detect surface defects of the object to be measured 900 based on the images obtained by the detection camera 200.

[0031] According to the vision detection system of the embodiments of the present utility model, its light source assembly 100 includes a bowl-shaped support member 110 and a plurality of light-emitting units 120. A through hole 111 is provided at the central position of the support member 110. The plurality of light-emitting units 120 are attached to the concave surface of the support member 110 facing the object to be measured 900 and are arranged around the through hole 111. When the support member 110 covers the object to be measured 900, the plurality of light-emitting units 120 are arranged around the periphery of the object to be measured 900, and each light-emitting unit 120 is located at a different position in the circumferential direction of the object to be measured 900. The detection camera 200 is disposed at the through hole 111, so as to be able to obtain an image of the object to be measured 900 through the through hole 111. In the vision detection system of the embodiments of the present utility model, each light-emitting unit 120 can emit light independently. When performing vision detection on the object to be measured 900, corresponding images can be obtained when the light-emitting units 120 at different positions in the circumferential direction of the object to be measured 900 emit light. The control component 300 can analyze and identify the surface defects of the object to be measured 900 based on the plurality of images corresponding to the light-emitting units 120 emitting light in the above different directions, thereby greatly improving the accuracy and detection rate of the surface defect detection of the object to be measured 900.

[0032] The number of the light-emitting units 120 included in the light source assembly 100 can be set according to the type of the object to be detected and the required detection accuracy. In one example, the light source assembly 100 includes 36 light-emitting units 120; in another example, the light source assembly 100 includes 72 light-emitting units 120.

[0033] In some embodiments, each light-emitting unit 120 extends from the through hole 111 in a direction away from the center of the through hole 111, and each light-emitting unit 120 is arranged in an arc shape.

[0034] In the above embodiments, each light-emitting unit 120 extends from the through hole 111 in a direction away from the center of the through hole 111, so that each light-emitting unit 120 has a relatively long actual light-emitting area, which is convenient for improving the irradiation effect of each light-emitting unit 120 on the object to be measured 900 when emitting light, thereby improving the quality of the obtained image.

[0035] In some embodiments, each light-emitting unit 120 includes a plurality of light-emitting elements 121. The plurality of light-emitting elements 121 are arranged from the through hole 111 in a direction away from the center of the through hole 111, and as the light-emitting elements 121 gradually move away from the through hole 111, the included angle between the light-emitting direction of the light-emitting elements 121 and the plane where the object to be measured is located gradually decreases.

[0036] In some embodiments, each light-emitting unit 120 includes a plurality of light-emitting elements 121, and the light-emitting elements 121 are, for example, light-emitting diode (LED) light-emitting elements. The bowl-shaped support 110 has a bowl mouth end away from the through hole 111. In some embodiments, each light-emitting unit 120 extends from the through hole 111 to the bowl mouth end. In each light-emitting unit 120, the light-emitting direction of the light-emitting element 121 closest to the through hole 111 forms an angle close to 90° with the plane where the object to be measured 900 is located, and the light-emitting direction of the light-emitting element 121 closest to the bowl mouth end forms an angle close to 0° with the plane where the object to be measured 900 is located.

[0037] In the above embodiments, each light-emitting unit 120 includes light-emitting elements 121 with various light-emitting directions, so that when each light-emitting unit 120 emits light, the object to be measured 900 can be irradiated from multiple angular directions, thereby further improving the detection rate of surface defects of the object to be measured 900.

[0038] In some embodiments, at least one light-emitting unit 120 includes a plurality of light-emitting elements 121 of various colors, and each light-emitting element 121 is electrically connected to the control component 300. In some embodiments, each light-emitting unit 120 includes a plurality of light-emitting elements 121 of various colors.

[0039] In the above embodiments, at least one light-emitting unit 120 includes light-emitting elements 121 of various colors. Therefore, when performing visual inspection on the object to be measured 900, images corresponding to different color fill light states can also be obtained based on the light of different colors emitted by the light-emitting unit 120. The control component 300 can perform further surface defect recognition based on the plurality of images corresponding to different color fill light states, thereby further improving the defect detection effect.

[0040] In some embodiments, the plurality of light-emitting elements 121 of various colors include red light-emitting elements, green light-emitting elements, and blue light-emitting elements. By controlling the light-emitting brightness of the red light-emitting elements, green light-emitting elements, and blue light-emitting elements, the actual light-emitting effects of various colors can be mixed, so as to facilitate the surface defect detection of the object to be measured 900 with different appearance colors by the visual inspection system.

[0041] In some embodiments, the control component 300 includes a light source controller electrically connected to the plurality of light-emitting units 120, and the light source controller is configured to be able to control the light-emitting sequence of the plurality of light-emitting units 120.

[0042] In some embodiments, the control component 300 further includes a camera controller and a defect detection module. At least part of the control component 300 may be disposed in the industrial control computer. The camera controller is electrically connected to the detection camera 200 and is configured to control the detection camera 200 to acquire images. The defect detection module is electrically connected to the camera controller. The defect detection module is configured with a defect detection algorithm, and this defect detection algorithm can separately analyze and process multiple images acquired by the detection camera 200, so as to identify the surface defects of the object 900 to be measured. The defect detection algorithm is obtained, for example, by training a preset deep learning model.

[0043] In one example, when performing visual inspection on the object 900 to be measured, the light source controller controls multiple light emitting units 120 to emit light in a specific order in sequence, and when each light emitting unit 120 emits light, the camera controller controls the detection camera 200 to acquire the corresponding image. In a further example, when performing visual inspection on the object 900 to be measured, the light source controller controls all the light emitting units 120 to emit light separately in a clockwise or counterclockwise direction in the upward viewing direction in sequence, and acquires the corresponding image through the detection camera 200 when each light emitting unit 120 emits light.

[0044] In some embodiments, the light source controller is configured to be able to control the light emitting brightness of each light emitting unit 120. When performing visual inspection on the object 900 to be measured, it is also possible to acquire corresponding multiple images based on different brightness supplementary lighting states generated by the light emitting units 120. The control component 300 can perform further surface defect identification based on the multiple images corresponding to the brightness supplementary lighting states, so as to further improve the defect detection effect.

[0045] In some embodiments, the light source assembly 100 may further include a diffuser plate. The diffuser plate is disposed on the peripheral side of each light emitting unit 120 and / or the bottom side of each light emitting unit 120 facing the support member 110. The color of the diffuser plate can be adjusted according to actual detection requirements. By adaptively arranging the diffuser plate at the light emitting unit 120, the diffuser plate can diffusely reflect the light irradiated in the direction away from the object to be measured in the direction towards the object to be measured, thereby improving the quality of the image acquired when the light emitting unit 120 emits light.

[0046] In some embodiments, the detection camera 200 includes an image sensor 210, a lens 220 disposed on the side of the image sensor 210 facing the object 900 to be measured, and a polarizer 230 mounted on the lens 220. In the above embodiment, the polarizer 230 can filter light. When the image sensor 210 acquires an image of the object 900 to be measured, the polarizer 230 performs filtering processing on some interfering light, so as to obtain an image that can more accurately reflect the surface defects and improve the accuracy of surface defect detection.

[0047] Figure 3It is a schematic cross-sectional structure diagram of an alternative embodiment of the vision detection system of the present utility model. Figure 4 It is a bottom view schematic diagram of the light source assembly in an alternative embodiment of the vision detection system of the present utility model. The light source assembly 100 includes a support member 110 and a plurality of light emitting units 120. The support member 110 is in a bowl shape capable of covering the object to be measured, and the concave surface of the bowl-shaped support member 110 faces the object to be measured 900. A through hole 111 is provided at the center position of the support member 110, and a plurality of light emitting units 120 are attached to the concave surface and arranged around the through hole 111. The detection camera 200 is arranged at the through hole 111. The control component 300 is electrically connected to the plurality of light emitting units 120 and the detection camera 200. Each light emitting unit 120 can emit light independently. The detection camera 200 can obtain the corresponding image of the object to be measured 900 when any light emitting unit 120 emits light. The control component 300 is configured to detect the surface defects of the object to be measured 900 based on the image obtained by the detection camera 200.

[0048] In this embodiment, each light emitting unit 120 includes at least two light emitting subunits 120s arranged in sequence from the through hole 111 in a direction away from the center of the through hole 111. Each light emitting subunit 120s can emit light independently and is electrically connected to the control component 300.

[0049] In the above alternative embodiment, each light emitting unit 120 further includes at least two light emitting subunits 120s. Each light emitting subunit 120s can emit light independently and is electrically connected to the control component 300. When performing vision detection on the object to be measured 900, in addition to being able to obtain the corresponding images in different directions when the light emitting units 120 at different circumferential positions of the object to be measured 900 emit light, it is also possible to obtain the corresponding images at different angles when different light emitting subunits 120s within the same light emitting unit 120 emit light. The control component 300 can analyze and identify the surface defects of the object to be measured 900 based on the multiple images corresponding to different directions and the images corresponding to different angles described above, thereby further improving the accuracy of detecting the surface defects of the object to be measured 900.

[0050] The above are only the preferred embodiments of the present utility model, and do not limit the patent scope of the present utility model. Any equivalent structural transformation made by using the specification and drawings of the present utility model under the concept of the present utility model, or direct / indirect application in other related technical fields, is included in the patent protection scope of the present utility model.

Claims

1. A visual detection system, characterized in that, Comprising: A light source assembly, including a support member and a plurality of light-emitting units. The support member is in a bowl shape capable of covering the object to be measured, wherein the concave surface of the bowl-shaped support member faces the object to be measured, a through hole is provided at the central position of the support member, and the plurality of light-emitting units are attached to the concave surface and arranged around the through hole; A detection camera, disposed at the through hole; A control assembly, electrically connected to the plurality of light-emitting units and the detection camera. Each light-emitting unit can emit light independently, and the detection camera can obtain a corresponding image of the object to be measured when any light-emitting unit emits light. The control assembly is configured to detect surface defects of the object to be measured based on the image obtained by the detection camera.

2. The visual inspection system according to claim 1, characterized in that, Each light-emitting unit extends from the through hole in a direction away from the center of the through hole, and each light-emitting unit is arranged in an arc shape.

3. The visual detection system according to claim 2, characterized in that, Each light-emitting unit includes a plurality of light-emitting elements. The plurality of light-emitting elements are arranged in a direction away from the center of the through hole, and as the light-emitting elements gradually move away from the through hole, the angle between the light-emitting direction of the light-emitting elements and the plane where the object to be measured is located gradually decreases.

4. The visual inspection system according to claim 2, wherein Each light-emitting unit includes at least two light-emitting sub-units arranged in sequence from the through hole in a direction away from the center of the through hole. Each light-emitting sub-unit can emit light independently and is electrically connected to the control assembly.

5. The visual inspection system according to claim 1, characterized in that, At least one of the light-emitting units includes a plurality of light-emitting elements of multiple colors, and each light-emitting element is electrically connected to the control assembly.

6. The visual inspection system according to claim 5, characterized in that, The plurality of light-emitting elements of multiple colors include red light-emitting elements, green light-emitting elements, and blue light-emitting elements.

7. The visual inspection system according to claim 1, wherein The control assembly includes a light source controller electrically connected to the plurality of light-emitting units. The light source controller is configured to be able to control the light-emitting sequence of the plurality of light-emitting units.

8. The visual inspection system according to claim 7, wherein, The light source controller is configured to be able to control the light-emitting brightness of each light-emitting unit.

9. The visual inspection system according to claim 1, wherein The light source assembly further includes a diffuser plate, and the diffuser plate is disposed on the periphery of each light-emitting unit and / or the bottom side of each light-emitting unit facing the support member.

10. The visual inspection system according to claim 1, wherein, The detection camera includes an image sensor, a lens disposed on the side of the image sensor facing the object to be measured, and a polarizer mounted on the lens.

Images