CN112067627A - Method and device for detecting self-explosion source of toughened glass - Google Patents
Method and device for detecting self-explosion source of toughened glass Download PDFInfo
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- 238000004880 explosion Methods 0.000 title claims abstract description 64
- 239000005341 toughened glass Substances 0.000 title claims abstract description 60
- 238000000034 method Methods 0.000 title claims abstract description 18
- 230000007547 defect Effects 0.000 claims abstract description 130
- 239000011521 glass Substances 0.000 claims abstract description 128
- 239000002245 particle Substances 0.000 claims abstract description 33
- 238000001514 detection method Methods 0.000 claims abstract description 19
- 238000004364 calculation method Methods 0.000 claims description 5
- 238000001914 filtration Methods 0.000 claims description 4
- 239000003550 marker Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 3
- 230000035882 stress Effects 0.000 description 13
- 230000002269 spontaneous effect Effects 0.000 description 10
- WWNBZGLDODTKEM-UHFFFAOYSA-N sulfanylidenenickel Chemical compound [Ni]=S WWNBZGLDODTKEM-UHFFFAOYSA-N 0.000 description 7
- 230000002950 deficient Effects 0.000 description 5
- 238000004891 communication Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000005357 flat glass Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000005496 tempering Methods 0.000 description 3
- 239000004115 Sodium Silicate Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000005474 detonation Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000012634 fragment Substances 0.000 description 2
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 235000019795 sodium metasilicate Nutrition 0.000 description 2
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 2
- 229910052911 sodium silicate Inorganic materials 0.000 description 2
- 238000006124 Pilkington process Methods 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 230000001154 acute effect Effects 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012790 confirmation Methods 0.000 description 1
- 239000006063 cullet Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000006355 external stress Effects 0.000 description 1
- 239000005329 float glass Substances 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
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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
- G01N21/89—Investigating the presence of flaws or contamination in moving material, e.g. running paper or textiles
- G01N21/8901—Optical details; Scanning details
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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
-
- 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
- G01N2021/8829—Shadow projection or structured background, e.g. for deflectometry
- G01N2021/8832—Structured background, e.g. for transparent objects
-
- 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
- G01N21/89—Investigating the presence of flaws or contamination in moving material, e.g. running paper or textiles
- G01N2021/8909—Scan signal processing specially adapted for inspection of running sheets
-
- 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
- G01N21/89—Investigating the presence of flaws or contamination in moving material, e.g. running paper or textiles
- G01N2021/8909—Scan signal processing specially adapted for inspection of running sheets
- G01N2021/891—Edge discrimination, e.g. by signal filtering
-
- 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
- G01N21/89—Investigating the presence of flaws or contamination in moving material, e.g. running paper or textiles
- G01N21/8914—Investigating the presence of flaws or contamination in moving material, e.g. running paper or textiles characterised by the material examined
Abstract
The invention belongs to the technical field of material detection, and particularly relates to a method and a device for detecting a self-explosion source of toughened glass. The two point light sources irradiate the glass, if the glass contains defects, two spots are projected, the two spots are photographed to obtain pictures, the pictures are subjected to image processing to obtain plane coordinates of the centers of the two spots, and the positions of the defects in the thickness direction of the glass are calculated according to the distance between the centers of the two spots; and when the defect is located in the range of 25-75% of the thickness direction of the glass, shooting the defect to obtain a picture, carrying out image processing on the picture, judging the type of the defect according to the image processing result, and marking the glass containing the defect when the type of the defect is heterogeneous particles. The invention can quickly and accurately detect whether the glass contains the self-explosion source causing the self-explosion of the toughened glass when the glass moves, and abandons the subsequent toughening treatment on the glass containing the self-explosion source, thereby obviously reducing the self-explosion of the toughened glass.
Description
Technical Field
The invention belongs to the technical field of material detection, and particularly relates to a method and a device for detecting a self-explosion source of toughened glass.
Background
The glass is treated by a physical or chemical method to form compressive stress on the surface of the glass, and the glass with the tensile stress formed inside is called toughened glass. The toughened glass is regarded as safe glass, and because the toughened glass has high strength, good toughness and excellent thermal shock resistance, broken glass fragments have no obvious acute angle, so the toughened glass is widely applied to glass curtain walls and door and window engineering, but the toughened glass has the fatal defect of 'self-explosion', and the fragments generated by the self-explosion of the glass of the high-rise curtain wall are fallen from a high place to cause accidents of damaging vehicles and pedestrians, so the toughened glass becomes one of hot spot problems concerned by various communities.
The continuous efforts of scientific and technological workers find that heterogeneous particles in a glass plate are the main cause of the self-explosion of the toughened glass, the self-explosion of the toughened glass is caused by the fact that the sum of tensile stress caused by the volume change of the heterogeneous particles and the tensile stress generated during toughening processing exceeds the intrinsic strength of the glass, most of the particles are nickel sulfide, small parts of heterogeneous particles such as simple substance silicon, aluminum oxide, sodium metasilicate and the like, and the majority of the particles causing the self-explosion are found to be in the range of 25-75% of the thickness direction of the glass, and meanwhile, no bubbles are found to cause the self-explosion of the toughened glass, which is consistent with the theory of the self-explosion of the toughened glass. As the size of the particles of the simple substance silicon, the aluminum oxide and the sodium metasilicate is generally larger than that of the nickel sulfide particles in the glass, and the size of the particles is mostly positioned in the detection range of the float glass on-line detector, most of the glass containing the particles can be detected, and the next step of toughening processing treatment can not be carried out, which is also consistent with the lower spontaneous explosion rate caused by the heterogeneous particles in the actual work. The nickel sulfide particles are spherical in the glass, the practical engineering statistical result shows that the diameter of the nickel sulfide which causes the self-explosion of the toughened glass is mostly between 0.1 and 0.2mm, the nickel sulfide with the diameter larger than 0.2mm accounts for less than 10 percent, the nickel sulfide with the diameter smaller than 0.1mm occurs but the number is very small, and the size of the nickel sulfide particles is very small and exceeds the capability of the current online detection equipment of the float production line.
According to the current national standard, the number of point defects of superior products with the diameter of 100mm and the inner size of a circle of less than 0.3mm and more than or equal to 0.1mm is not more than 3, there is no limitation to the point defects of 0.1mm or less, that is, as many as hundreds of point defects of 0.3mm or less per square meter of the glass sheet can be judged as good products, for the toughened glass, one self-explosion source can cause the whole toughened glass to be broken, if any point defect can cause the self-explosion, almost every piece of glass can be subjected to the self-explosion, this is not in accordance with the generally accepted statistical data for spontaneous explosions of about 3 sheets per thousand sheets of glass, therefore, most point defects can not cause the self-explosion, only few point defects can cause the self-explosion of the toughened glass, however, the existing technology can not find out the defects of self-explosion of the toughened glass which is possibly caused by extremely small quantity efficiently, quickly, accurately and economically.
Chinese patent CN 107976406a discloses a polarized light flexible screen and a method for detecting the self-explosion source of the existing building toughened glass, the polarized light flexible screen comprises a diffuse refraction transparent body and a polarizing film, the diffuse refraction transparent body and the polarizing film are adhered together, and the diffuse refraction transparent body is made of a flexible material. Covering the polarized light flexible screen on the outer side of the existing building toughened glass; scanning the toughened glass by using a scanner with a polaroid to obtain a stress image; and analyzing the stress image to find out stress concentration light spots.
Chinese patent CN 107632020A discloses a method for detecting the hidden danger of self-explosion of toughened glass tableware and the application thereof, the stress line of the toughened glass tableware is detected, the closer the stress line is to the central line of the cross section of the toughened glass, the smaller the probability of self-explosion is, the farther the stress line is from the central line of the cross section of the toughened glass, the greater the probability of self-explosion is; the stress line is formed on the cross section of the toughened glass by superposing internal and external stresses due to wind pressure in the process of toughening the toughened glass; the cross section of the toughened glass is a section vertical to the thickness direction of the toughened glass.
Chinese patent CN 111487191A discloses a toughened glass spontaneous explosion hidden danger detection method and device based on image processing, wherein, a picture is obtained by shooting glass under the irradiation of a light source, the picture is processed, and whether a defect exists or not is judged according to the image processing result; if the image is defective, a real image and a virtual image with defects exist on the image, and the pixel distance 2d between the real image and the virtual image is obtained through image processingpHalf of this distance dpIs the pixel distance of the defect centroid from the glass lower surface, and marks the defect.
In the above patent, CN 107976406a and CN 107632020 a both detect tempered glass products, and detect stress concentration spots or product spontaneous explosion probability according to stress, and the detected defective products can only be recycled as cullet, which not only loses the cost of glass, but also loses the cost required by tempering glass. Although the CN 111487191 a detects the non-tempered glass, the camera needs to capture a real image and a virtual image of a defect in the same picture in an inclined state, so that glasses with different thicknesses need to correspond to different object distances, and therefore the method can be implemented only by using an electric focusing lens, and has high requirements on the camera, high manufacturing cost of equipment, and high difficulty.
At present, it is needed to provide a method for detecting a self-explosion source of tempered glass, which can significantly reduce the self-explosion of tempered glass and mark the defects causing the self-explosion.
Disclosure of Invention
The invention aims to provide a method for detecting a toughened glass self-explosion source, which can quickly detect whether a heterogeneous particle self-explosion source causing the toughened glass self-explosion exists or not when the glass moves, mark the glass containing the self-explosion source and give up toughening treatment, and toughen the glass without the self-explosion source, so that the self-explosion rate of the toughened glass can be obviously reduced, and uncontrollable risks caused by the self-explosion of the toughened glass are greatly reduced.
The invention relates to a detection method of a toughened glass self-detonation source, which comprises the following steps:
(1) the two point light sources irradiate the glass, if the glass contains defects, two spots are projected, the two spots are photographed to obtain pictures, the pictures are subjected to image processing to obtain plane coordinates of the centers of the two spots, and the positions of the defects in the thickness direction of the glass are calculated according to the distance between the centers of the two spots;
(2) and when the defect is located in the range of 25-75% of the thickness direction of the glass, shooting the defect to obtain a picture, carrying out image processing on the picture, judging the type of the defect according to the image processing result, and marking the glass containing the defect when the type of the defect is heterogeneous particles.
The distance between the two point light sources and the glass in the step (1) are determined according to the maximum glass width to be detected, so that the light emitted by the two point light sources covers the whole glass width and has a common irradiation area; the distance between the two point light sources is preferably 200-3000mm, and the distance between the two point light sources and the glass is preferably 200-3000 mm.
The two point light sources in step (1) are preferably on the same horizontal plane.
The irradiation of the two point light sources on the glass in the step (1) is that the two point light sources irradiate towards the other side of the glass from the same side of the glass.
The glass in the step (1) is non-toughened glass.
The image processing in the step (1) is one or more of filtering processing, edge calculation processing, image morphology processing or binarization processing.
The shooting in the step (2) is amplification shooting.
The device for the detection method of the toughened glass self-explosion source comprises a working machine, wherein the working machine is respectively connected with a first industrial camera set, a second industrial camera set, a first electric linear guide rail module, a defect position marking device and a second electric linear guide rail module, glass is arranged on a conveying roller, a rear projection screen, the first industrial camera set, the second industrial camera set, the first electric linear guide rail module, the defect position marking device and the second electric linear guide rail module are arranged above the glass, the rear projection screen is arranged in parallel with the glass, the first industrial camera set is arranged above the rear projection screen, the second industrial camera set is connected with the first electric linear guide rail module, the defect position marking device is connected with the second electric linear guide rail module, the rear projection screen, the second industrial camera set, the first electric linear guide rail module, the defect position marking device and the second electric linear guide rail module are sequentially arranged from left to right, two point light sources and a lamp box are arranged below the glass, the two point light sources are symmetrically arranged relative to the vertical central line of the rear projection screen, the lamp box is arranged under the second industrial camera set, and the two point light sources are arranged on the left side of the lamp box.
The first industrial camera group consists of N industrial cameras, the number N of the cameras is determined by the width of glass and the pixels of the cameras, preferably 50-200 pixels per centimeter, and N is preferably 1-60; the N industrial cameras are arranged side by side, preferably the N industrial cameras are arranged side by side in the glass width direction, and the shooting range at least covers the whole rear projection screen.
The second industrial camera group consists of M industrial cameras, wherein M is preferably 2-5, M is more preferably 3, the M industrial cameras are arranged side by side, and M industrial cameras are preferably arranged side by side in the moving direction. Because the glass moving speed is fast, the camera must adopt fixed focal length, and because the glass thickness scope that every camera can sharp formation of image is less again, so can set up the camera of a plurality of different focal lengths, camera number should satisfy the defect and obtain a clear photo when passing camera unit at least.
The first electric linear guide rail module consists of a guide rail, a sliding table and a motor. When the first electric linear guide rail module receives a position signal sent by the working machine, the sliding table on the guide rail can move to a specified position under the driving of the motor.
And the second industrial camera set is fixed on the movable sliding table of the first electric linear guide rail module.
The second electric linear guide rail module consists of a guide rail, a sliding table and a motor. When the second electric linear guide rail module receives a position signal sent by the working machine, the sliding table on the guide rail can move to a specified position under the driving of the motor.
The defect position marking device is an electromagnetic ink jet marker and is fixed on the movable sliding table of the second electric linear guide rail module.
The first electric linear guide rail module is a linear guide rail module driven by a stepping motor with 485 communication.
The second electric linear guide rail module is a linear guide rail module driven by a stepping motor with 485 communication.
The lamp box is vertically irradiated towards the glass.
The invention arranges two point light sources in the moving direction of one side of the glass plate, adjusts the distance between the two point light sources and the glass, so that the light rays emitted by the two point light sources pass through the same area of the glass plate, the area can cover the whole width of the glass plate, when the defective glass passes through the area, the light rays from the two point light sources can be blocked, two spots are formed on a rear projection screen arranged on the other side of the glass plate, in order to quickly measure the position coordinates of the defect, a camera is arranged right above the back of the rear projection screen, the camera captures the two spots into a frame of image, the central plane coordinates of the two spots are obtained through image processing, because the distance between the two spots and the distance between the defect and the plane on a roller way are in a linear relationship, the position of the defect in the thickness direction of the glass is calculated according to the distance, if, and the second industrial camera group is used for amplifying and shooting the defects to obtain high-precision pictures, processing the pictures to judge whether the defects are bubbles or heterogeneous particles, abandoning subsequent tempering processing treatment on the glass plate containing the heterogeneous particles, and marking the positions of the heterogeneous particles on the glass plate so as to carry out manual confirmation.
The invention relates to a detection method of a toughened glass self-detonation source, which comprises the following specific steps:
1. obtaining the position of the defect in the thickness direction of the glass
The glass plate or the continuous glass belt is positioned on the conveying roller, the glass passes through the position of the rear projection screen at a constant speed of 0.1-25m/min along with the constant-speed rotation of the conveying roller, two point light sources are arranged in the movement direction below the middle of the glass in the width direction, light rays emitted by the two point light sources cross the glass plate below the rear projection screen and cover the whole width of the glass plate, and when the defective glass passes through the area below the rear projection screen, the light rays from the two point light sources are blocked to form two spots on the rear projection screen. The first industrial camera set is formed by arranging N industrial cameras side by side, the shooting range covers the whole rear projection screen, the working machine controls the first industrial camera set to shoot the rear projection screen at fixed time intervals, and the time intervals are required to guarantee that two spots of each defect are shot. The first industrial camera set shoots spots formed by the defects and transmits the spots to the working machine, the working machine carries out filtering, edge calculation, image morphology and binarization operation on all or part of the picture to obtain plane coordinates of centers of the two spots, the position of the defect in the thickness direction of the glass is calculated according to the distance between the centers of the two spots, when the defect is positioned in the range of 25% -75% of the thickness direction of the glass, the center point of the spot and a vertical projection point of a corresponding point light source on a rear projection screen are connected, the intersection point of the two connected lines is the position of the defect in the plane of the glass, and the position coordinates and the shooting time are transmitted to the working machine to carry out subsequent operation on the working machine.
2. Determining defect type
The working machine controls the first electric linear guide rail module to operate after receiving the plane position coordinates and the photographing time, the second industrial camera set is moved to the front of the defect to stop before the defect reaches the second industrial camera set, the defect is photographed in sequence when passing through the position under the M industrial camera lenses, the M lenses have different object distances, so that at least one clear defect picture can be obtained when glass plates with different thicknesses and containing the defect pass through, the defect is subjected to image processing to obtain the type of the defect, and the program is terminated when the type of the defect is a bubble to wait for the next defect to be detected. And when the defect type is heterogeneous particles, sending the position coordinates and the photographing time to a working machine, and carrying out subsequent operation on the working machine.
3. Marking
After the two steps, the defect is judged to be heterogeneous particles, the defect is shown to be a self-explosion source, the tempered glass sheet has high self-explosion probability, and the working machine marks the glass sheet without subsequent tempering treatment. And meanwhile, the working machine controls the second electric linear guide rail module to operate, the defect position marking device is stopped in front of the defect, and when the defect moves to a position right below the defect position marking device, the defect is subjected to ink jet marking so as to be manually confirmed.
The detection method comprises three steps, wherein the position of a defect in the thickness direction of the glass plate is detected, the defect within the range of 25% -75% of the thickness direction of the glass plate is amplified to judge whether the defect is a bubble or a heterogeneous particle, and the glass plate containing the heterogeneous particle within the range of 25% -75% of the thickness direction of the glass plate is marked. The third step may not be ink-jet marked on the defective position, but the order of the three steps cannot be interchanged.
The detection method is invented according to the years statistical law of the defect characteristics of the flat glass production line, namely about 90 percent of defects are positioned on the upper surface and the lower surface of a glass plate, and the rest defects are positioned in the middle of glass. According to the toughened glass spontaneous explosion theory and the practical working experience, the surface defects can not cause spontaneous explosion, and the method can find the source of the spontaneous explosion only by detecting a small amount of defects in the glass plate, which is the basis for the rapid detection.
According to the general theory, if a point needs to be captured by the camera as a stable image, theoretically at least 2 pixels are needed. For example, if a 1280X720 pixel global exposure CMOS camera is used, in order to display a 0.1mm defect on a picture, the width of the glass plate is 64mm and the length of the glass plate is 36mm, the resolution is sufficient to determine the position of the defect in the thickness direction of the glass plate, but the resolution is far from the requirement if the defect with the size of 0.1mm is a bubble or a heterogeneous particle. The plate glass to be detected in actual production is wider, if the whole glass plate needs to be detected according to the invention and needs to be spliced and shot by a plurality of cameras, for example, the width of a 3m glass plate needs 48 1280X720 pixel cameras to work simultaneously according to the invention, if the defect type is judged at first or the position in the thickness direction is judged at the same time, at least 240 cameras are needed to shoot simultaneously, the principle of engineering economy and practicality is not met, the engineering realization is almost impossible, and the reason that the position of the defect in the thickness direction of the glass plate is detected in the first step of the invention is also the reason.
After the glass is detected in the first step, the number of defects needing further detection is greatly reduced. In order to judge whether a point defect as small as 0.1mm is a bubble or a heterogeneous particle, the length and width of the point defect in each frame of picture are at least more than 10 pixels, at the moment, a camera is moved by utilizing the plane position coordinate and the time information obtained in the first step to photograph the defect in an amplifying way, so that whether the point defect is the bubble or the heterogeneous particle is judged, the bubble is safe at any position in the thickness direction of the glass plate, the spontaneous explosion probability is negligible, but the heterogeneous particles in the range of 25% -75% in the thickness direction of the glass have the risk of spontaneous explosion, and the spontaneous explosion probability is higher when the point defect is closer to the middle position.
And thirdly, marking the glass plate containing the heterogeneous particles within the range of 25-75% of the thickness direction of the glass without subsequent toughening processing according to the detection results of the first step and the second step, and marking the detailed positions of the heterogeneous particles from an explosion source.
The invention can rapidly detect whether the moving transparent plate glass or the continuous glass belt contains the self-explosion source.
The invention has the following beneficial effects:
the invention can quickly and accurately detect whether the glass contains the self-explosion source causing the toughened glass to explode automatically when the glass moves, and abandons the subsequent toughening treatment on the glass containing the self-explosion source, thereby obviously reducing the self-explosion of the toughened glass and greatly reducing the uncontrollable risk brought by the toughened glass used by high-rise buildings.
Compared with the prior detection technology, the invention can enlarge and project the defects to the rear projection screen, practice verifies that the detection rate of the defects of 0.1mm points reaches more than 98 percent, the detection precision is high, the distance between the rear projection screen and the camera is fixed and right opposite, the requirement on the video camera is low, and the manufacturing difficulty and the cost of the equipment are greatly reduced.
Drawings
FIG. 1 is a schematic diagram of the structure of the apparatus of the present invention;
FIG. 2 is a top view of the apparatus of the present invention;
fig. 3 is a two-spot picture of defect formation taken by the first industrial camera group in embodiment 1;
FIG. 4 is the binarized picture of FIG. 3;
fig. 5 is a bubble defect picture taken by the second industrial camera group in embodiment 1;
FIG. 6 is the binarized picture of FIG. 5;
FIG. 7 is a photograph of a defect in a heterogeneous particle captured by the second industrial camera set in example 1;
FIG. 8 is the binarized picture of FIG. 7;
in the figure: 1. a working machine; 2. glass; 3. a conveying roller; 4. a rear projection screen; 5. a first industrial camera set; 6. a point light source; 7. a second industrial camera set; 8. a first electric linear guide rail module; 9. a defect position marking device; 10. a second electric linear guide rail module; 11. and (4) a lamp box.
Detailed Description
The present invention is further described below with reference to examples.
Example 1
As shown in figures 1 and 2, the device for detecting the toughened glass self-explosion source comprises a working machine 1, wherein the working machine 1 is respectively connected with a first industrial camera set 5, a second industrial camera set 7, a first electric linear guide rail module 8, a defect position marking device 9 and a second electric linear guide rail module 10, a conveying roller 3 is provided with glass 2, a rear projection screen 4, the first industrial camera set 5, the second industrial camera set 7, the first electric linear guide rail module 8, the defect position marking device 9 and the second electric linear guide rail module 10 are arranged above the glass 2, the rear projection screen 4 is arranged in parallel with the glass 2, the first industrial camera set 5 is arranged above the rear projection screen 4, the second industrial camera set 7 is connected with the first electric linear guide rail module 8, the defect position marking device 9 is connected with the second electric linear guide rail module 10, the rear projection screen 4, Second industry camera set 7, first electronic linear guide module 8, defect position marking device 9 and second electronic linear guide module 10 set gradually from left to right, and glass 2's below is provided with two pointolite 6 and lamp house 11, and two pointolite 6 set up for rear-projection screen 4's vertical central line symmetry, and lamp house 11 sets up under second industry camera set 7, and two pointolite 6 set up the left side at lamp house 11.
The first industrial camera group is composed of 24 industrial cameras, and the 24 industrial cameras are arranged side by side in the glass width direction.
The second industrial camera group is composed of 3 industrial cameras, and the 3 industrial cameras are arranged side by side in the moving direction.
The first electric linear guide rail module consists of a guide rail, a sliding table and a motor. When the first electric linear guide rail module receives a position signal sent by the working machine, the sliding table on the guide rail can move to a specified position under the driving of the motor.
And the second industrial camera set is fixed on the movable sliding table of the first electric linear guide rail module.
The second electric linear guide rail module consists of a guide rail, a sliding table and a motor. When the second electric linear guide rail module receives a position signal sent by the working machine, the sliding table on the guide rail can move to a specified position under the driving of the motor.
The defect position marking device is an electromagnetic ink jet marker and is fixed on the movable sliding table of the second electric linear guide rail module.
The first electric linear guide rail module is a linear guide rail module driven by a stepping motor with 485 communication.
The second electric linear guide rail module is a linear guide rail module driven by a stepping motor with 485 communication.
The detection method of the toughened glass self-explosion source comprises the following steps:
1. obtaining the position of the defect in the thickness direction of the glass
The glass with the width of 1.5m is positioned on the conveying roller, the glass passes through the position of the rear projection screen at a constant speed of 5m/min along with the constant-speed rotation of the conveying roller, two point light sources are arranged on two sides of the central line of the rear projection screen below the glass, the distance between the two point light sources is 1000mm, the distance between the two point light sources and the upper surface of the conveying roller is 500mm, the distance between the upper surface of the conveying roller and the rear projection screen is 50mm, and at the moment, if the glass contains defects, two amplified spots appear on the rear projection screen above the glass. The method comprises the steps that 24 industrial cameras of a first industrial camera set are arranged side by side, a single shooting range is guaranteed to cover the whole rear projection screen, the first industrial camera set shoots the rear projection screen once every 20 seconds, a defect is shot to form a spot and is transmitted to a working machine, the working machine carries out filtering, edge calculation, image morphology and binarization operation on the whole or part of a picture to obtain central coordinates of two spots, the position of the defect in the thickness direction of glass is obtained through calculation according to the distance between the centers of the two spots, when the defect is located in the range of 25% -75% of the thickness direction of the glass, the central point of the spot is connected with a vertical projection point of a corresponding point light source on the rear projection screen, the intersection point of the two connection lines is the position of the defect in the plane of the glass, and the position coordinates and the shooting time are transmitted to the.
Two spot pictures formed by defects shot by the first industrial camera set and binary pictures thereof are shown in fig. 3 and 4.
2. Determining defect type
The working machine controls the first electric linear guide rail module to operate after receiving the position coordinates and the photographing time, the second industrial camera set is moved to the front of the defect to stop before the defect reaches the second industrial camera set, the defect is photographed in sequence when passing through the position right below the 3 industrial camera lenses, the defect is subjected to image processing to obtain the type of the defect, and the program is terminated when the type of the defect is a bubble to wait for detecting the next defect. And when the defect type is heterogeneous particles, sending the position coordinates and the photographing time to a working machine, and carrying out subsequent operation on the working machine.
The bubble defect picture and the binarization picture thereof shot by the second industrial camera set are shown in figures 5 and 6, and the heterogeneous particle defect picture and the binarization picture thereof shot by the second industrial camera set are shown in figures 7 and 8.
3. Marking
When the defect is heterogeneous particles, the defect is a self-explosion source, the toughened glass sheet has high self-explosion probability, the working machine marks the glass sheet and does not perform subsequent toughening treatment, meanwhile, the working machine controls the second electric linear guide rail module to operate, the defect position marking device is stopped in front of the defect, and when the defect moves to the position under the defect position marking device, the defect is subjected to ink jet marking so as to be manually confirmed.
Claims (10)
1. A detection method of a toughened glass self-explosion source is characterized by comprising the following steps:
(1) the two point light sources irradiate the glass, if the glass contains defects, two spots are projected, the two spots are photographed to obtain pictures, the pictures are subjected to image processing to obtain plane coordinates of the centers of the two spots, and the positions of the defects in the thickness direction of the glass are calculated according to the distance between the centers of the two spots;
(2) and when the defect is located in the range of 25-75% of the thickness direction of the glass, shooting the defect to obtain a picture, carrying out image processing on the picture, judging the type of the defect according to the image processing result, and marking the glass containing the defect when the type of the defect is heterogeneous particles.
2. The method as claimed in claim 1, wherein the distance between the two point light sources in step (1) is 200-3000mm, and the distances between the two point light sources and the glass are both 200-3000 mm.
3. The method for detecting the self-explosion source of the tempered glass as claimed in claim 1, wherein the irradiation of the glass by the two point light sources in the step (1) is that the two point light sources irradiate from the same side of the glass to the other side of the glass.
4. The method for detecting the self-explosion source of the tempered glass as claimed in claim 1, wherein the glass in the step (1) is non-tempered glass.
5. The method for detecting the self-explosion source of the tempered glass as claimed in claim 1, wherein the image processing in the step (1) is one or more of filtering processing, edge calculation processing, image morphology processing or binarization processing.
6. The method for detecting the self-explosion source of the tempered glass as claimed in claim 1, wherein the photographing in the step (2) is an enlarged photographing.
7. A device for the detection method of the toughened glass self-explosion source as claimed in any one of claims 1 to 6, comprising a working machine (1), characterized in that the working machine (1) is respectively connected with a first industrial camera set (5), a second industrial camera set (7), a first electric linear guide rail module (8), a defect position marking device (9) and a second electric linear guide rail module (10), a conveying roller (3) is provided with glass (2), a rear projection screen (4), the first industrial camera set (5), the second industrial camera set (7), the first electric linear guide rail module (8), the defect position marking device (9) and the second electric linear guide rail module (10) are arranged above the glass (2), the rear projection screen (4) is arranged in parallel with the glass (2), the first industrial camera set (5) is arranged above the screen (4), second industry camera set (7) link to each other with first electronic linear guide module (8), defect position mark device (9) and second electronic linear guide module (10) link to each other, rear-projection curtain (4), second industry camera set (7), first electronic linear guide module (8), defect position mark device (9) and second electronic linear guide module (10) set gradually from left to right, the below of glass (2) is provided with two pointolite (6) and lamp house (11), two pointolite (6) set up for the vertical central line symmetry of rear-projection curtain (4), lamp house (11) set up under second industry camera set (7), two pointolite (6) set up the left side at lamp house (11).
8. The device according to claim 7, characterized in that said first group of industrial cameras (5) is composed of N industrial cameras, N being 1-60, arranged side by side.
9. The device according to claim 7, characterized in that said second group (7) of industrial cameras is composed of M industrial cameras, M being 2-5, said M industrial cameras being arranged side by side.
10. The device according to claim 7, characterized in that the defect position marking device (9) is an electromagnetic ink jet marker.
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