CN113109346A - Automatic surface quality detection system and method for automobile panel plate - Google Patents
Automatic surface quality detection system and method for automobile panel plate Download PDFInfo
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- CN113109346A CN113109346A CN202110250018.7A CN202110250018A CN113109346A CN 113109346 A CN113109346 A CN 113109346A CN 202110250018 A CN202110250018 A CN 202110250018A CN 113109346 A CN113109346 A CN 113109346A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/8806—Specially adapted optical and illumination features
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/8851—Scan or image signal processing specially adapted therefor, e.g. for scan signal adjustment, for detecting different kinds of defects, for compensating for structures, markings, edges
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/8851—Scan or image signal processing specially adapted therefor, e.g. for scan signal adjustment, for detecting different kinds of defects, for compensating for structures, markings, edges
- G01N2021/8887—Scan or image signal processing specially adapted therefor, e.g. for scan signal adjustment, for detecting different kinds of defects, for compensating for structures, markings, edges based on image processing techniques
Abstract
The invention discloses an automatic surface quality detection system and method for an automobile panel plate, belonging to the technical field of automatic detection in the stamping industry; comprises a transmission unit and a detection unit; the detection unit is arranged above the plate conveying unit; the detection unit comprises a plate position positioning vision system, a high-speed stripe pattern light-emitting laser light source, a stripe pattern light source control system, a high-speed linear scanning shooting CMOS optical camera and a computer system central processing unit; the method comprises the steps of projecting a plate by using a laser light source capable of generating high-speed parallel stripe patterns, collecting and generating different image types by using a high-speed linear scanning CMOS optical camera, and identifying the surface quality defects of the plate of an original covering part by using a digital image processing system; thus screening the surface quality defects of the panel of the covering part in advance; the method is favorable for establishing a surface quality standard database, is convenient for judging and tracing the surface quality problem of the plate, and has strong applicability.
Description
Technical Field
The invention discloses an automatic surface quality detection system and method for an automobile panel plate, belonging to the technical field of automatic detection in the stamping industry; relates to a detection system of an automobile panel plate, in particular to an automatic surface quality detection system and method of the panel plate.
Background
The surface quality of the automobile covering part is a key link for manufacturing the white automobile body of the automobile, and the surface quality of the covering part needs to be subjected to professional white automobile body AUDIT evaluation and is extremely strict; deformation defects such as wrinkles, depressions, craters, pull marks, ripples and the like existing on the surface of an automobile panel after being manufactured can affect the diffuse reflection of light after being coated, so that the appearance quality of an automobile is seriously affected. The painted surface quality of automotive panels affects customer satisfaction with the vehicle model. By analyzing the position of the defects on the covering element, the reasons for the defects and the defect degree, the production process of the covering element can be continuously perfected and optimized.
Some surface defects of the automobile covering part after the punching forming are caused by the original plate material, and are not generated in the punching forming process of the covering part; in the prior art, the surface quality detection of the original plate of the automobile panel is often ignored; the defects of folds, collision damage, craters, indentations and the like are easily generated due to the influences of surrounding environments or human factors and the quality factors of the plates per se in the processes of production, packaging, unpacking, cutting, transferring, transportation and storage of the plates of the automobile covering part, and the defects of folds, collision damage, craters, indentations and the like are easily generated after the defects of the original plates are produced by punching the automobile covering part, so that the defects of the surface of the formed part are caused. In actual production now, the measurement personnel can detect the covering after the stamping forming, often neglect effective detection to original sheet material surface quality, also or detect through artifical visual or hand template surface, so not only detection efficiency is low, and is higher to inspection personnel's quality requirement, and the degree of accuracy receives artificial factor image moreover, and the rate of accuracy is not high, also delays the production beat easily.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides an automatic surface quality detection system and method for an automobile panel plate.
In order to achieve the above purpose, the invention provides the following scheme:
an automatic surface quality detection system for automobile panel plates comprises a conveying unit a and a detection unit b;
the detection unit b is arranged above the plate conveying unit a;
the detection unit b comprises a plate position positioning vision system 4, a high-speed stripe pattern light-emitting laser light source 6, a stripe pattern light source control system 8, a high-speed linear scanning shooting CMOS optical camera 5 and a computer system central processing unit 17;
the plate position positioning vision system 4 is used for carrying out vision capturing and positioning on the plate 1;
the high-speed stripe pattern light-emitting laser light source 6 is used for parallel light stripe projection, and parallel light stripes are formed on the surface of the plate material 1;
the high-speed linear scanning shooting CMOS optical camera 5 is used for carrying out high-speed photographic collection on the light pattern on the upper surface of the plate 1;
the stripe pattern light source control system 8 controls the high-speed stripe pattern light-emitting laser light source 6 to emit stripe light, and the stripe light is projected to the surface of the plate 1;
the stripe pattern light source control system 8 and the high-speed stripe pattern light-emitting laser light source 6 are sequentially in communication connection with a central processing unit 17 of a computer system.
Further, the detection unit b further comprises an image signal amplifier 10, a signal reader 11, an a/D converter 12, a digital image acquisition unit 13, and a digital image processing system 14;
the signal output end of the high-speed linear scanning and shooting CMOS optical camera 5 is connected with the input end of an image signal amplifier 10, the output end of the image signal amplifier 10 is connected with the input end of a signal reader 11, the output end of the signal reader 11 is connected with the input end of a digital image acquisition unit 13 through an A/D converter 12, and the image acquisition unit 13 transmits an output digital image to a digital image processing system 14 for processing and detection; the high-speed linear scanning shooting CMOS optical camera 5, the image signal amplifier 10, the signal reader 11, the A/D converter 12, the digital image acquisition unit 13 and the digital image processing system 14 are sequentially in communication connection with a computer system central processing unit 17.
Further, the digital image processing system 14 generates an image with the defect portion extracted according to the acquired images of different stripes by using a standard image algorithm, a specular reflection image algorithm, a diffuse reflection image algorithm, a gloss ratio image algorithm and a shape image algorithm, so that the defects of surface scratch, dirty point, darkness and depression are effectively identified;
the detection result of the surface quality of the plate 1 is obtained by identifying the types and the conditions of the surface quality defects of the plate 1 and comparing the types and the conditions with the quality standard preset in the computer system 17. And if the detection result does not exceed the error allowable range, judging that the surface quality of the plate 1 is qualified, and if the detection result exceeds the error allowable range, judging that the surface quality of the plate 1 has defects and the surface quality is unqualified.
Further, the detection unit b further comprises a PLC control system 16,
the computer system central processor 17 is in communication connection with the PLC control system 16, and controls the running and suspension of the conveying system a through the PLC control system 16;
further, the detection unit b further comprises an alarm system 15;
the computer system central processing unit 17 is in communication connection with the alarm system 15, and the alarm system 15 gives out sound and light warnings.
Further, the detection unit b further includes a D/a converter 7;
the stripe pattern light source control system 8, the D/A converter 7 and the high-speed stripe pattern light-emitting laser light source 6 are sequentially in communication connection with a central processing unit 17 of a computer system;
the stripe pattern light source control system 8 controls the high-speed stripe pattern light-emitting laser light source 6 to emit stripe light through the D/A converter 7, and projects the stripe light to the surface of the plate material 1.
Further, the generating of the image of the extracted defect portion includes a standard image, a specular reflection image, a diffuse reflection image, a gloss ratio image, and a shape image.
Further, the conveying unit a comprises a sheet conveying belt 2 and a conveying roller group 3; the conveying roller set 3 and the conveying belt 2 realize the automatic conveying process of the covering panel 1.
A detection method of an automatic surface quality detection system for an automobile panel plate comprises the following steps:
the method comprises the following steps: when the automobile panel plate 1 is conveyed on the conveyor belt 2 one by one, the plate position positioning vision system 4 positioned above the conveyor belt 2 identifies and positions the plate 1 to be detected;
step two: the computer system central processing unit 17 sends an instruction to the high-speed stripe pattern light-emitting laser light source 6, the laser light source 6 performs parallel light stripe projection on the positioned plate 1 at a certain angle, and light stripes with different shapes and effects are formed on the surface 1 of the plate according to the surface quality state of the plate 1;
step three: the high-speed linear scanning shooting CMOS optical camera 5 above the plate 1 takes pictures of the light pattern of the plate 1 at a high speed, the signal that the CMOS optical camera 5 outputs is input to the digital image acquisition unit 13 through the signal amplifier 10 of the picture, signal reader 11, A/D converter 12, the digital image acquisition unit 13 outputs the digital image and transmits to the digital image processing system 14 to process and detect;
step four: the digital image processing system 14 generates an image with extracted defect parts, i.e., a standard image, a specular reflection image, a diffuse reflection image, a gloss ratio image, and a shape image, according to the acquired images of different stripes by using a standard image algorithm, a specular reflection image algorithm, a diffuse reflection image algorithm, and a shape image algorithm, and identifies the defects of surface scratch, dirty spot, darkness, and sag.
The detection result of the surface quality of the plate 1 is obtained by identifying the type and the condition of the surface quality defect of the plate 1 and comparing the type and the condition with a quality standard preset in a computer system 17; and if the detection result does not exceed the error allowable range, judging that the surface quality of the plate 1 is qualified, and if the detection result exceeds the error allowable range, judging that the surface quality of the plate 1 has defects and the surface quality is unqualified.
Further, the method also comprises the following step five: when a certain defect exists in the surface quality detection of a certain plate on the conveying unit a, the digital image processing system 14 identifies and feeds back the certain defect to the central processing unit 17 of the computer system, the central processing unit 17 of the computer system controls the alarm system 15 to start, sounds and lights are sent out to warn an operator, meanwhile, the PLC control system 16 controls the conveying unit a to stop running, and the operator takes down the defective plate.
Compared with the prior art, the invention has the beneficial technical effects that:
the invention provides an automatic surface quality detection system and method for an automobile covering panel, which are characterized in that a laser light source capable of generating high-speed parallel stripe patterns is used for projecting a panel, different image types are acquired and generated by a high-speed linear scanning CMOS optical camera, and a digital image processing system is applied to identify the surface quality defects of the panel of an original covering panel; therefore, the surface quality defects of the covering piece plate are screened in advance, and the surface quality defects of the original plate after the covering piece is subjected to punch forming are prevented from being transmitted by the surface quality defect factors of the original plate.
The detection system does not need to stop the line detection in a static state, can be carried out in a normal production rhythm, has the characteristic of being suitable for automatic line detection, realizes quick detection, effectively ensures the production efficiency, has high detection efficiency and detection accuracy, and can be used for quick production of stamping automatic lines. The method can detect the surface quality defects of the panel of the covering part digitally and standardizedly, is favorable for establishing a surface quality standard database, is convenient for judging and tracing the surface quality problems of the panel and has strong applicability.
Drawings
FIG. 1 is a schematic structural diagram of a system for detecting surface quality of panels of automotive panels according to the present invention;
in the figure:
1. a plate material;
2. a conveyor belt;
3. a transmission roller set;
4. a sheet position positioning vision system;
5. a high-speed linear scanning shooting CMOS optical camera;
6. a high-speed stripe pattern light-emitting laser light source;
7. a D/A converter;
8. a stripe pattern light source control system;
9. example of a stripe pattern of a sheet defect region;
10. an image signal amplifier;
11. a signal reader;
12. an A/D converter;
13. a digital image acquisition unit;
14. a digital image processing system;
15. an alarm system;
16. a PLC control system;
17. a computer system central processing unit;
a. a transfer unit;
b. a detection unit.
Detailed Description
The invention will be further explained with reference to the accompanying drawings:
referring to fig. 1, the automatic surface quality detection system for the panel of the automobile covering part comprises a conveying unit a and a detection unit b, wherein the conveying unit a comprises a panel conveyor belt 2 and a conveying roller group 3; the detection unit b is arranged above the sheet material conveying unit a and comprises a sheet material position positioning visual system 4, a high-speed stripe pattern light-emitting laser light source 6, a D/A converter 7, a stripe pattern light source control system 8, a high-speed linear scanning shooting CMOS optical camera 5 (CMOS is an abbreviation of Complementary Metal semiconductor and is a core imaging part of a digital camera and is a Complementary Metal oxide conductor device), an image signal amplifier 10, a signal reader 11, an A/D converter 12, a digital image acquisition unit 13, a digital image processing system 14, a computer system central processing unit 17, a PLC control system 16 and an alarm system 15.
The conveying unit a consists of a conveying roller group 3 and a conveying belt 2, the automatic conveying process of the covering panel 1 is realized, and the moving direction is indicated by an arrow from left to right;
the detection unit b is arranged above the plate conveying unit a, and the plate position positioning vision system 4 is used for carrying out vision capture positioning on the plate 1 conveyed on the conveying belt 2;
a high-speed stripe pattern light-emitting laser light source 6, which adopts a light stripe laser projection principle, positions a vision system 4 according to the position of a plate, performs parallel light stripe projection on the positioned plate 1 at a certain angle, forms parallel light stripes on the surface of the plate 1, forms light stripes with different shapes and effects on the surface of the plate 1 if the plate 1 has defects of folds, depressions, pit bags, pull marks, ripples and the like, and performs high-speed photographic acquisition on the light stripe pattern of the plate 1 by a high-speed linear scanning shooting CMOS optical camera 5 above the plate 1;
the stripe pattern light source control system 8 controls the high-speed stripe pattern light-emitting laser light source 6 to emit stripe light through the D/A converter 7 and projects the stripe light to the surface of the plate material 1;
the stripe pattern light source control system 8, the D/A converter 7 and the high-speed stripe pattern light-emitting laser light source 6 are sequentially in communication connection with a central processing unit 17 of a computer system;
the high-speed linear scanning shooting CMOS optical camera 5 is characterized in that a signal output end of the high-speed linear scanning shooting CMOS optical camera 5 is connected with an input end of an image signal amplifier 10, an output end of the image signal amplifier 10 is connected with an input end of a signal reader 11, after the signal reader 11 reads an amplified signal, an output end of the signal reader is connected with an input end of a digital image acquisition unit 13 through an A/D converter 12, and then the image acquisition unit 13 transmits an output digital image to a digital image processing system 14 for processing and detection.
The high-speed linear scanning shooting CMOS optical camera 5, the image signal amplifier 10, the signal reader 11, the A/D converter 12, the digital image acquisition unit 13 and the digital image processing system 14 are sequentially in communication connection with a central processing unit 17 of a computer system;
the digital image processing system 14 may apply a standard image algorithm, a specular reflection image algorithm, a diffuse reflection image algorithm, a gloss ratio image algorithm, and a shape image algorithm to generate a plurality of images from which the defect portion is extracted, that is, a standard image, a specular reflection image, a diffuse reflection image, a gloss ratio image, a shape image, and the like, according to the acquired images of different stripes, and may effectively identify the defects such as surface scratches, dirty spots, darkness, depressions, and the like.
The detection result of the surface quality of the plate 1 is obtained by identifying the types and the conditions of the surface quality defects of the plate 1 and comparing the types and the conditions with the quality standard preset in the computer system 17.
And if the detection result does not exceed the error allowable range, judging that the surface quality of the plate 1 is qualified, and if the detection result exceeds the error allowable range, judging that the surface quality of the plate 1 has defects and the surface quality is unqualified.
The computer system central processor 17 is in communication connection with the PLC control system 16, and controls the running and suspension of the conveying system a through the PLC control system 16;
the computer system central processing unit 17 is in communication connection with the alarm system 15, and the alarm system 15 can make a sound and light alarm.
A method for automatically detecting the surface quality of an automobile panel plate is used in the detection system and is characterized by comprising the following steps:
the method comprises the following steps: when the automobile panel plate 1 is conveyed on the conveyor belt 2 one by one, the plate position positioning vision system 4 positioned above the conveyor belt 2 identifies and positions the plate 1 to be detected;
step two: the computer system central processing unit 17 sends an instruction to the high-speed stripe pattern light-emitting laser light source 6, the laser light source 6 performs parallel light stripe projection on the positioned plate 1 at a certain angle, and light stripes with different shapes and effects can be formed on the surface 1 of the plate according to the surface quality state of the plate 1;
step three: the high-speed linear scanning shooting CMOS optical camera 5 above the plate 1 takes pictures of the light pattern of the plate 1 at a high speed, the signal that the CMOS optical camera 5 outputs is input to the digital image acquisition unit 13 through the signal amplifier 10 of the picture, signal reader 11, A/D converter 12, the digital image acquisition unit 13 outputs the digital image and transmits to the digital image processing system 14 to process and detect;
step four: the digital image processing system 14 generates an image with extracted defect parts, i.e., a standard image, a specular reflection image, a diffuse reflection image, a gloss ratio image, and a shape image, according to the acquired images of different stripes by using a standard image algorithm, a specular reflection image algorithm, a diffuse reflection image algorithm, and a shape image algorithm, and identifies the defects of surface scratch, dirty spot, darkness, and sag.
The standard image algorithm, the specular reflection image algorithm, the diffuse reflection image algorithm, the gloss ratio image algorithm and the shape image algorithm are the prior art and can be obtained by market purchase.
The detection result of the surface quality of the plate 1 is obtained by identifying the type and the condition of the surface quality defect of the plate 1 and comparing the type and the condition with a quality standard preset in a computer system 17;
and if the detection result does not exceed the error allowable range, judging that the surface quality of the plate 1 is qualified, and if the detection result exceeds the error allowable range, judging that the surface quality of the plate 1 has defects and the surface quality is unqualified.
Step five: when a certain defect exists in the surface quality detection of a certain plate on the conveying unit a, the digital image processing system 14 identifies and feeds back the certain defect to the central processing unit 17 of the computer system, the central processing unit 17 of the computer system controls the alarm system 15 to start, sounds and lights are sent out to warn an operator, meanwhile, the PLC control system 16 controls the conveying unit a to stop running, and the operator can take down the defective plate.
The above description is only for the purpose of illustrating the present invention and the appended claims are not to be construed as limiting the scope of the invention, which is intended to cover all modifications, equivalents and improvements that are within the spirit and scope of the invention as defined by the appended claims. And those not described in detail in this specification are well within the skill of those in the art.
Claims (10)
1. The utility model provides a surface quality automatic check out system of automobile panel sheet material which characterized in that: comprises a transmission unit a and a detection unit b;
the detection unit b is arranged above the plate conveying unit a;
the detection unit b comprises a plate position positioning vision system 4, a high-speed stripe pattern light-emitting laser light source (6), a stripe pattern light source control system (8), a high-speed linear scanning shooting CMOS optical camera (5) and a computer system central processing unit (17);
the plate position positioning vision system (4) is used for carrying out vision capturing positioning on the plate (1);
the high-speed stripe pattern light-emitting laser light source (6) is used for projecting parallel light stripes and forming the parallel light stripes on the surface of the plate (1);
the high-speed linear scanning shooting CMOS optical camera (5) is used for carrying out high-speed photographic collection on the light pattern on the upper surface of the plate (1);
the stripe pattern light source control system (8) controls the high-speed stripe pattern light-emitting laser light source (6) to emit stripe light, and the stripe light is projected to the surface of the plate (1);
the stripe pattern light source control system (8) and the high-speed stripe pattern light-emitting laser light source (6) are sequentially in communication connection with a central processing unit (17) of a computer system.
2. The automatic surface quality detection system for automobile panel blanks as recited in claim 1, wherein:
the detection unit b further comprises an image signal amplifier (10), a signal reader (11), an A/D converter (12), a digital image acquisition unit (13) and a digital image processing system (14);
the signal output end of the high-speed linear scanning and shooting CMOS optical camera (5) is connected with the input end of an image signal amplifier (10), the output end of the image signal amplifier (10) is connected with the input end of a signal reader (11), the output end of the signal reader (11) is connected with the input end of a digital image acquisition unit (13) through an A/D converter (12), and the image acquisition unit (13) transmits an output digital image to a digital image processing system (14) for processing and detection; the high-speed linear scanning shooting CMOS optical camera (5), the image signal amplifier (10), the signal reader (11), the A/D converter (12), the digital image acquisition unit (13) and the digital image processing system (14) are sequentially in communication connection with a central processing unit (17) of a computer system.
3. The automatic surface quality detection system for automobile panel blanks as recited in claim 2, wherein:
the digital image processing system (14) generates images of extracted defect parts according to the acquired images of different stripes by using a standard image algorithm, a specular reflection image algorithm, a diffuse reflection image algorithm, a gloss ratio image algorithm and a shape image algorithm, and effectively identifies the defects of surface scratch, dirty points, darkness and depression.
4. The automatic surface quality detection system for automobile panel blanks as recited in claim 1, wherein:
the detection unit b further comprises a PLC control system (16);
the computer system central processor (17) is in communication connection with the PLC control system (16), and controls the operation and the pause of the conveying system a through the PLC control system (16).
5. The automatic surface quality detection system for automobile panel blanks as recited in claim 1, wherein:
the detection unit b further comprises an alarm system (15);
the computer system central processing unit (17) is in communication connection with the alarm system (15), and the alarm system (15) gives out sound and light warning.
6. The automatic surface quality detection system for automobile panel blanks as recited in claim 1, wherein:
the detection unit b further comprises a D/A converter (7);
the stripe pattern light source control system (8), the D/A converter (7) and the high-speed stripe pattern light-emitting laser light source (6) are sequentially in communication connection with a central processing unit (17) of a computer system;
the stripe pattern light source control system (8) controls the high-speed stripe pattern light-emitting laser light source (6) to emit stripe light through the D/A converter (7) and projects the stripe light to the surface of the plate (1).
7. The automatic surface quality detection system for automobile panel blanks as recited in claim 3, wherein:
and generating an image of the extracted defect part, wherein the image comprises a standard image, a specular reflection image, a diffuse reflection image, a gloss ratio image and a shape image.
8. The automatic surface quality detection system for automobile panel blanks as recited in claim 1, wherein:
the conveying unit a comprises a sheet material conveying belt (2) and a conveying roller group (3); the conveying roller set (3) and the conveying belt (2) realize the automatic conveying process of the covering panel (1).
9. The inspection method of the automatic inspection system for the surface quality of the panel material for automobile panels according to claim 1, comprising the steps of:
the method comprises the following steps: when the automobile panel plates (1) are conveyed on the conveyor belt (2) one by one, the plate position positioning vision system (4) positioned above the conveyor belt (2) identifies and positions the plates (1) to be detected;
step two: a central processing unit (17) of a computer system sends an instruction to a high-speed stripe pattern light-emitting laser light source (6), the laser light source (6) performs parallel light stripe projection on the positioned plate (1) at a certain angle, and light stripes with different shapes and effects are formed on the surface (1) of the plate according to the surface quality state of the plate (1);
step three: a high-speed linear scanning shooting CMOS optical camera (5) above the plate (1) is used for carrying out high-speed photographing collection on the light pattern of the plate (1), signals output by the CMOS optical camera (5) are input to a digital image collecting unit (13) through an image signal amplifier (10), a signal reader (11) and an A/D converter (12), and the digital image collecting unit (13) outputs digital images to be transmitted to a digital image processing system (14) for processing and detection;
step four: the digital image processing system (14) uses a standard image algorithm, a specular reflection image algorithm, a diffuse reflection image algorithm, a gloss ratio image algorithm and a shape image algorithm to generate images of extracted defect parts, namely the standard image, the specular reflection image, the diffuse reflection image, the gloss ratio image and the shape image, according to the acquired images of different stripes, so that the defects of surface scratch, dirty spots, darkness and depression are effectively identified;
the detection result of the surface quality of the plate 1 is obtained by identifying the type and the condition of the surface quality defect of the plate 1 and comparing the type and the condition with a quality standard preset in a computer system 17; and if the detection result does not exceed the error allowable range, judging that the surface quality of the plate (1) is qualified, and if the detection result exceeds the error allowable range, judging that the surface quality of the plate (1) has defects and the surface quality is unqualified.
10. The detection method according to claim 9, further comprising the steps of:
step five: when a certain defect exists in the surface quality detection of a certain plate on the conveying unit a, the digital image processing system (14) identifies and feeds back the certain defect to the computer system central processing unit (17), the computer system central processing unit (17) controls the alarm system (15) to start, sounds and lights are emitted to warn operators, meanwhile, the PLC control system (16) controls the conveying unit a to stop running, and the operators take down the defective plate.
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