Apparent defect detection equipment for furniture plates

Abstract

The utility model provides appearance defect detection equipment for furniture plates, which not only can prevent a light source from irradiating a workpiece to be detected to cause a dispersion phenomenon, but also can prevent the color difference defect of the furniture plates from being covered. Appearance defect detection equipment for furniture plates comprises a front-back transverse conveyor belt, the middle of the conveyor belt is a detection area, a light source is arranged above the conveyor belt, and the light source irradiates towards the detection area; the back part of the conveying belt is used for transversely placing the furniture plate front and back, and the conveying belt conveys the furniture plate forwards so that a plurality of parts of the furniture plate from front to back sequentially pass through the detection area to be illuminated by the light source; a color camera is arranged above the conveying belt, and the color camera is used for shooting local furniture plates which reach the detection area and are illuminated by the light source; the device is characterized in that the light source comprises two monochromatic light sources, and the colors of emitted light of the monochromatic light sources are different. The light emitted by the monochromatic light source does not belong to a continuous spectrum, so that the dispersion phenomenon is basically avoided when the light is irradiated on the furniture plate.

Description

Technical Field

[0001] The utility model relates to the field of furniture boards, in particular to an appearance defect detection device for furniture boards. Background Art

[0002] Patent document CN219285057U discloses a grading and color separation detector, an unmanned quality inspection line and an automated production line, which mainly disclose that: the grading and color separation detector includes a conveyor belt 65, and above the conveyor belt 65, there are a color linear array camera 62, a black and white linear array camera 63 and a linear array light source 64; a workpiece to be detected is placed on the conveyor belt 65, the linear array light source 64 irradiates the workpiece to be detected, and the black and white linear array camera and the color linear array camera respectively take pictures of the workpiece to be detected that is being irradiated; the processor in the grading and color separation detector analyzes the black and white photos taken by the black and white linear array camera 63 to judge whether the surface flatness of the workpiece to be detected meets the standard, and the processor analyzes the color photos taken by the color linear array camera 62 to judge whether the color and pattern of the workpiece to be detected meet the standard. Since the linear array light source 64 is a white light source, and white light is a continuous spectrum, when it irradiates the workpiece to be detected, chromatic dispersion phenomenon will occasionally occur, resulting in color difference in the color photos taken by the color linear array camera 62, and the result obtained by the processor analyzing the color photos for judgment will be inaccurate. Summary of the Utility Model

[0003] The inventor has developed a technical solution of using a monochromatic light source to replace the white light source without disclosure. When the monochromatic light source irradiates the workpiece to be detected, chromatic dispersion phenomenon basically does not occur, but the monochromatic light source also has disadvantages, that is, if the color of the board is the same as the color of the monochromatic light source, the color difference defect of the board will be very inconspicuous under the irradiation of the monochromatic light source, and it is difficult to see the color difference defect of the board in the color photos taken by the color linear array camera 62, resulting in difficulty for the processor to analyze the color photos to identify the color difference defect.

[0004] Therefore, the utility model provides an appearance defect detection device for furniture boards, which can not only avoid chromatic dispersion phenomenon when the light source irradiates the workpiece to be detected, but also avoid the color difference defect of the furniture board from being covered up.

[0005] The appearance defect detection device for furniture boards includes a front-back horizontal conveyor belt, the middle part of the conveyor belt is a detection area, and a light source is arranged above the conveyor belt, and the light source irradiates towards the detection area; the rear part of the conveyor belt is for the furniture board to be placed horizontally in the front-back direction, and the conveyor belt transports the furniture board forward so that multiple local parts of the furniture board from front to back sequentially pass through the detection area and are illuminated by the light source; a color camera is arranged above the conveyor belt, and the color camera takes pictures of the local part of the furniture board that has reached the detection area and has been illuminated by the light source; its characteristics are that: the light source includes two monochromatic light sources, and the light output colors of these monochromatic light sources are different.

[0006] Further, the monochromatic light source is in the shape of a long strip horizontally from left to right, illuminating a horizontally long strip-shaped local area in the detection area, and the left and right ends of the long strip-shaped local area respectively extend to the left and right edges of the detection area.

[0007] Further, at least two of the monochromatic light sources are respectively a green monochromatic light source and a blue monochromatic light source. The two are arranged directly above the detection area. The green monochromatic light source is arranged behind the blue monochromatic light source, irradiating obliquely downward and forward, and the included angle between its irradiation direction and the detection area is 40° - 50°; the blue monochromatic light source irradiates obliquely downward and backward, and the included angle between its irradiation direction and the detection area is 20° - 30°.

[0008] Further, these monochromatic light sources are arranged side by side in the front and back directions, respectively irradiating different local areas of the detection area in the front and back directions.

[0009] Further, it includes a two-color light source that irradiates the detection area.

[0010] Further, it includes a black-and-white camera that takes pictures of the local area of the furniture board that has reached the detection area and has been illuminated by the light source; it includes a processor. The processor is connected to the black-and-white camera, obtains black-and-white photos from the black-and-white camera for flatness compliance analysis; the processor is connected to the color camera, obtains color photos from the color camera for color compliance analysis and / or pattern compliance analysis.

[0011] Further, there are multiple black-and-white cameras, and these black-and-white cameras are arranged side by side horizontally from left to right.

[0012] Further, the black-and-white camera is arranged in front of the detection area, shooting obliquely downward and backward, and the included angle between the shooting angle and the detection area is 20° - 30°.

[0013] Further, there are multiple color cameras, and these color cameras are arranged side by side horizontally from left to right.

[0014] Further, the color camera is arranged behind the detection area, shooting obliquely downward and forward, and the included angle between the shooting angle and the detection area is 40° - 50°.

[0015] The beneficial effects are as follows: In the present utility model, a monochromatic light source is used to irradiate the furniture board. The light emitted by the monochromatic light source does not belong to a continuous spectrum, so basically no dispersion phenomenon will occur when it irradiates the furniture board. The furniture board is monochromatic, and its color is at most exactly the same as that of only one monochromatic light source, that is, it is different from the irradiation light colors of other monochromatic light sources. Therefore, the color difference defect of the furniture board will only be covered by one of the monochromatic light sources and can be recognized under the irradiation of other monochromatic light sources. Description of the Drawings

[0016] Figure 1 is a three-dimensional view of the appearance defect detection device of the present utility model;

[0017] Figure 2 It is the right view of the appearance defect detection device of the present utility model;

[0018] In the figure: 3. UV super-crystal matte board; 4. Conveyor belt; 5. Color camera; 6. Rear vertical cylinder; 7. Black and white camera; 8. Green light monochromatic light source; 9. Red and blue double-color light source; 10. Blue light monochromatic light source; 11. Rear vertical rail; 12. Rear cross beam; 13. Front vertical rail; 14. Front vertical cylinder; 15. Front cross beam; 16. First vertical cylinder; 17. Detection area. Specific embodiments

[0019] The following further elaborates on the present utility model in conjunction with specific embodiments.

[0020] As Figure 1 shown, the appearance defect detection device includes a conveyor belt 4. The conveyor belt 4 is horizontally arranged front and back, and its middle part is the detection area 17. Above the detection area 17 of this appearance defect detection device, three pairs of first vertical cylinders 16 are installed, and each pair of first vertical cylinders 16 consists of two cylinders, one on the left and one on the right. Above the detection area 17, a green light monochromatic light source 8, a red and blue double-color light source 9, and a blue light monochromatic light source 10 are successively arranged from back to front. These three light sources 8, 9, and 10 are arranged side by side and are respectively installed on the three pairs of first vertical cylinders 16. These three light sources 8, 9, and 10 are all horizontally long strip-shaped, and respectively illuminate three horizontally long strip-shaped parts in the detection area 17. The left and right ends of each of these long strip-shaped parts respectively extend to the left and right edges of the detection area 17. In front of the three light sources 8, 9, and 10 of this appearance defect detection device, a front vertical rail 13 is installed. A front cross beam 15 is movably installed on the front vertical rail 13. Three 16K line-scan black and white cameras 7 are arranged side by side on the front cross beam 15. A front vertical cylinder 14 is installed on the front vertical rail 13, and the front vertical cylinder 14 drives the front cross beam 15 to lift and lower. Behind the three light sources 8, 9, and 10 of this appearance defect detection device, a rear vertical rail 11 is installed. A rear cross beam 12 is movably installed on the rear vertical rail 11. Three 16K line-scan color cameras 5 are arranged side by side on the rear cross beam 12. A rear vertical cylinder 6 is installed on the rear vertical rail 11, and the rear vertical cylinder 6 drives the rear cross beam 12 to lift and lower.

[0021] As Figure 1As shown, the UV super-crystal matte board 3 has been placed on the rear part of the conveyor belt 4 and is transported forward by the conveyor belt 4. Multiple local parts of the UV super-crystal matte board 3 in the front-rear direction will sequentially pass through the detection area 17. Taking the example that the front part of the UV super-crystal matte board 3 just reaches the detection area 17, three local parts of this front part in the front-rear direction are respectively illuminated by three light sources 8, 9, and 10, then photographed by the three black-and-white cameras 7 and the three color cameras 5, and then sent forward by the conveyor belt 4 out of the detection area 17, while the remaining local parts of the UV super-crystal matte board 3 will sequentially reach the inside of the detection area 17 to be photographed. This appearance defect detection device is equipped with a processor. The processor is connected to the black-and-white camera 7 to obtain black-and-white photos of the UV super-crystal matte board 3 from the black-and-white camera 7 for flatness compliance analysis; the processor is connected to the color camera 5 to obtain color photos of the UV super-crystal matte board 3 from the color camera 5 for color compliance analysis and pattern compliance analysis. If all these compliance analyses are qualified, the processor deems that the quality of the UV super-crystal matte board 3 is qualified; otherwise, the processor deems that the quality of the UV super-crystal matte board 3 is unqualified. The UV super-crystal matte board 3 has multiple thickness specifications. The operator can operate the front vertical cylinder 14, the rear vertical cylinder 6, and the first vertical cylinder 16 according to the thickness of the UV super-crystal matte board 3 detected this time to respectively adjust the height positions of the black-and-white camera 7, the color camera 5, and the three light sources 8, 9, and 10.

[0022] As Figure 2 shown, the red-blue dual-color light source 9 irradiates the detection area 17 vertically downward. The green monochromatic light source 8 irradiates obliquely downward and forward. The included angle ∠b between the irradiation light of the green monochromatic light source 8 and the detection area 17 is 45.5°; the color camera 5 photographs obliquely downward and forward, and the included angle ∠a between the photographing angle and the detection area 17 is 45.5°. The blue monochromatic light source 10 irradiates obliquely downward and backward. The included angle ∠c between the irradiation light of the blue monochromatic light source 10 and the detection area 17 is 25.5°; the black-and-white camera 7 photographs obliquely downward and backward. It needs to photograph at a lower photographing angle to capture the vertical texture of the furniture board. Therefore, the included angle ∠d between the photographing angle of the black-and-white camera 7 and the detection area 17 is 25.5°. The red-blue dual-color light source 9 irradiates vertically downward, highlighting the defects of the UV super-crystal matte board 3 that are difficult to detect under the irradiation of the monochromatic light sources 8 and 10.

[0023] Non-preferably, the included angle between the black-and-white camera 7 and the detection area 17 can be changed from 25.5° to any angle in the range of 20° to 30°, and correspondingly, the included angle between the blue monochromatic light source 10 and the detection area 17 is changed to the same angle. It is also possible to change the included angle of 45.5° between the color camera 5 and the detection area 17 to any angle between 40° and 50°, and correspondingly, change the included angle between the green monochromatic light source 8 and the detection area 17 to the same angle.

[0024] The above is only the implementation mode of the utility model, and does not limit the scope of patent protection. Those skilled in the art make non-substantive changes or substitutions based on the utility model, and still fall within the scope of patent protection.

Claims

1. Appearance defect detection equipment for furniture boards, including a conveyor belt that runs horizontally from front to back. The middle part of the conveyor belt is the detection area. There is a light source above the conveyor belt, and the light source irradiates towards the detection area. The rear part of the conveyor belt is for the furniture board to be placed horizontally from front to back. The conveyor belt transports the furniture board forward so that multiple local parts of the furniture board pass through the detection area from front to back and are illuminated by the light source in sequence. There is a color camera above the conveyor belt, and the color camera takes pictures of the local parts of the furniture board that have reached the detection area and have been illuminated by the light source. It is characterized in that: The light source includes two monochromatic light sources with different light output colors.

2. The appearance defect detection device according to claim 1, characterized in that: The monochromatic light source is in the shape of a long strip horizontally from left to right, illuminating a horizontally long strip-shaped local area in the detection area, and the left and right ends of the long strip-shaped local area extend to the left and right edges of the detection area respectively.

3. The appearance defect detection device according to claim 1, characterized in that: At least two of the monochromatic light sources are a green monochromatic light source and a blue monochromatic light source respectively. The two are arranged directly above the detection area. The green monochromatic light source is arranged behind the blue monochromatic light source, irradiating obliquely downward and forward, and the included angle between its irradiation direction and the detection area is 40° to 50°; the blue monochromatic light source irradiates obliquely downward and backward, and the included angle between its irradiation direction and the detection area is 20° to 30°.

4. The appearance defect detection device according to claim 1, wherein: These monochromatic light sources are arranged side by side front and back, respectively irradiating different local areas of the detection area in the front-back direction.

5. The appearance defect detection device according to claim 1, characterized in that: It includes a dual-color light source that irradiates the detection area.

6. The appearance defect detection device according to any one of claims 1 to 5, characterized in that: It includes a black-and-white camera that takes pictures of the local area of the furniture board that has reached the detection area and has been illuminated by the light source. It includes a processor. The processor is connected to the black-and-white camera to obtain black-and-white photos from the black-and-white camera for flatness compliance analysis; the processor is connected to the color camera to obtain color photos from the color camera for color compliance analysis and / or pattern compliance analysis.

7. The appearance defect detection device according to claim 6, characterized in that: There are multiple black-and-white cameras, and these black-and-white cameras are arranged side by side horizontally from left to right.

8. The appearance defect detection device according to claim 7, characterized in that: The black-and-white camera is arranged in front of the detection area, shooting obliquely downward and backward, and the included angle between the shooting angle and the detection area is 20° to 30°.

9. The appearance defect detection device according to claim 1, characterized in that: There are multiple color cameras, and these color cameras are arranged side by side horizontally from left to right.

10. The appearance defect detection device according to claim 9, characterized in that: The color camera is arranged behind the detection area, shooting obliquely downward and forward, and the included angle between the shooting angle and the detection area is 40° to 50.

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