CN112378351B - Toughened glass flatness online detection system and detection method thereof - Google Patents
Toughened glass flatness online detection system and detection method thereof Download PDFInfo
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- CN112378351B CN112378351B CN202011398956.3A CN202011398956A CN112378351B CN 112378351 B CN112378351 B CN 112378351B CN 202011398956 A CN202011398956 A CN 202011398956A CN 112378351 B CN112378351 B CN 112378351B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/30—Measuring arrangements characterised by the use of optical techniques for measuring roughness or irregularity of surfaces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/30—Measuring arrangements characterised by the use of optical techniques for measuring roughness or irregularity of surfaces
- G01B11/303—Measuring arrangements characterised by the use of optical techniques for measuring roughness or irregularity of surfaces using photoelectric detection means
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Abstract
The invention discloses a toughened glass flatness online detection system and a detection method thereof. The system comprises a lamp box for radiography, a camera for collecting the appearance of the toughened glass to be measured, a high-speed computer for analysis and calculation and a track speed real-time measuring device for measuring the speed of a conveying toughened glass conveying roller way, wherein the track speed real-time measuring device is in signal connection with the high-speed computer; the camera is in signal connection with the high-speed computer; the bottom of the lamp box is provided with a plurality of rows of round holes. Compared with a hawk system, the device directly measures the offset of the midpoint position of each light spot, has large signal, high measurement precision and low error, and because the measured parameters are simple, the device increases the number of the light spots, and a camera adopts a continuous high-speed sampling mode, so that denser measurement information can be obtained, and the measurement accuracy is improved; compared with ilook systems, the light box and the camera are used for replacing laser and a laser receiver, so that the cost is low and the debugging is convenient.
Description
Technical Field
The invention relates to the technical field of glass detection, in particular to a tempered glass flatness online detection system and a detection method thereof.
Background
The toughened glass is obtained by heating common annealed glass to about 700 ℃ close to a softening point, then carrying out rapid and uniform cooling, wherein the surface of the toughened glass forms uniform compressive stress, and the inside forms tensile stress, so that the bending resistance and the impact resistance of the glass are improved, but in the heating and cooling processes, the glass is deformed due to the fact that the glass runs on a ceramic conveying roller and gravity sinks between two rollers, the deformation is possibly larger when the furnace temperature is higher, and the deformation is periodic and is related to the interval of the rollers and the concentricity deviation of the rollers. Meanwhile, due to the fact that the lower surface of the glass is in contact with the roller way, a large part of heat is absorbed by heat conduction, the upper space in the furnace is large, the upper surface of the glass mainly absorbs heat radiation, the difference of the two heat absorption modes necessarily causes the difference of the heat absorption speed and the heat absorption quantity of the upper surface and the lower surface, and the glass is integrally bent due to the fact that the temperatures of the upper surface and the lower surface are inconsistent.
The optical image deformation caused by the uneven surface of the toughened glass seriously affects the overall beauty of the building, reduces the visual comfort of users and even becomes public visual pollution. In the construction industry, quality disputes caused by the flatness of glass are increasing, and although the glass industry standard has quality indexes of wavy bending and pure arched bending, the quality indexes are based on an idealized assumption that glass is in a perfect circular arc shape, the waveform is a standard sine waveform, and in fact, the surface deformation of the glass is only a complex multiple variant on the basis, the bow is even possibly S-shaped, and the wavelength and peak value of the waveform are different,
It is difficult to measure conveniently and accurately, and a factory usually adopts a dial indicator mounted on a flat ruler to measure the peak-valley value of the glass surface, and the method is time-consuming, laborious, low in precision, poor in accuracy and easy to scratch the glass surface.
The method adopted in the glass industry at present is to install a zebra plate on the outlet of a tempering furnace, an operator observes the zebra patterns reflected by the surface of the glass, and the more serious the zebra lines are bent, the worse the flatness of the glass is, and the quality of the glass is judged subjectively according to the zebra patterns. However, since quantitative detection results cannot be provided, there is a large standard deviation of judgment between operators, and thus quality control of consistency cannot be achieved.
Currently, the most used in the global toughened glass industry is a hawk system of LITESENTRY and a Ilook system of Glaston, wherein the hawk system is formed by installing a lamp box above a production line, forming patterns by using elliptical light spots, installing a camera above the production line, measuring the size, perimeter and direction of the long axis, the short axis and the perimeter of each elliptical light spot reflected to a lens by a glass sample, comparing with the light spots of an original lamp box, and calculating the refractive power of the glass surface; the system measures the length of the long axis and the short axis of the light spot, and the measurement accuracy and the error are difficult to control because the light spot is small.
The Ilook system adopts a laser and a receiver which are arranged on a production line, and calculates the refractive power of the glass surface by measuring the position of a laser spot reflected by the glass surface; the method has high cost, extremely high requirements on installation and debugging precision and difficult routine maintenance and debugging.
Disclosure of Invention
Aiming at the technical defects, the invention aims to provide a toughened glass flatness online detection system and a toughened glass flatness online detection method, which are used for calculating the refractive power of the glass surface by measuring the offset of the midpoint position of each light spot, and have the advantages of simple measurement parameters, high measurement precision and low error.
In order to solve the technical problems, the invention adopts the following technical scheme:
the toughened glass flatness online detection system is characterized by comprising a lamp box for radiography, a camera for collecting the appearance of the toughened glass to be detected, a high-speed computer for analysis and calculation and a track speed real-time measuring device for measuring the speed of a conveying toughened glass conveying roller way, wherein the track speed real-time measuring device is in signal connection with the high-speed computer; the camera is in signal connection with the high-speed computer; the bottom of the lamp box is provided with a plurality of rows of round holes, two adjacent rows of round holes at the bottom of the lamp box are distributed at intervals, the distance between two adjacent round holes in one row at the bottom of the lamp box is 70mm, the distance between two adjacent rows of round holes is 60mm, and the diameter of each round hole is 50mm.
Preferably, the camera is a CCD camera.
The invention also relates to an online detection method for the flatness of the toughened glass, which is characterized by comprising the following steps of:
1) The lamp box is arranged at the tail end of the toughened glass production line and above the glass conveying roller way; a camera is arranged at a position above the glass conveying roller way corresponding to the lamp box;
2) The glass is uniformly transmitted on a glass transmission roller way and passes through a lamp box and a camera, a round hole at the bottom of the lamp box forms a high-precision high-brightness circular spot lamp curtain, the camera continuously shoots images of circular spots of the lamp box at high speed in the running process of the glass, the position change of each circular spot along with the movement of the glass is recorded, and shooting signals are transmitted to a high-speed computer;
3) The high-speed computer calculates the slope of each point on the surface of the glass through a slope formula to obtain a slope curve of each point of the glass along the transmission direction; calculating a height curve of the glass surface through a height formula, and reducing the appearance of the whole glass surface; the slope formula is as follows: d, the offset of the light spot, and the distance from the lens to the glass; slope of The height formula is as follows: y i＝yi-1+Δy＝yi-1 +tan alpha x delta x, y is the relative height of the glass, and x is the position of the glass along the transmission direction;
4) The difference value between the wave crest and the wave trough of each wave is used for representing the flatness of the glass, and the diopter of each point on the surface of the glass is used for representing the refractive power of the glass; light folding capability according to the following formula F is the focal length of the point, R is the radius of curvature of the point, and diopter unit is md; and obtaining the difference value of the wave crest and the wave trough of each curve and the focal power of the wave crest and the wave trough, wherein only the focal power value of the wave crest and the wave trough is maximum in the wave of each period, counting the difference value of the wave crest and the wave trough of each scanning line and the diopter of each point on the surface of the glass, and quantitatively evaluating the flatness and the image deformation of the glass sheet.
The invention has the beneficial effects that: compared with a hawk system, the device directly measures the offset of the midpoint position of each light spot, has large signal, high measurement precision and low error, and because the measured parameters are simple, the device increases the number of the light spots, and a camera adopts a continuous high-speed sampling mode, so that denser measurement information can be obtained, and the measurement accuracy is improved; compared with ilook systems, the light box and the camera are used for replacing laser and a laser receiver, so that the cost is low and the debugging is convenient.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a system and a method for detecting the flatness of tempered glass on line;
FIG. 2 is a schematic diagram of a system for online detecting flatness of tempered glass and a detecting method thereof;
FIG. 3 is a schematic diagram of the structure of the bottom of a lamp box of the toughened glass flatness online detection system and the detection method thereof;
Reference numerals illustrate:
the device comprises a lamp box 1, a camera 2, a high-speed computer 3, glass 4, a track speed real-time measuring device 5, a glass conveying roller way 6, a lamp box image 7 and a round hole 8.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
1-3, The online detection system for the flatness of the toughened glass 4 comprises a lamp box 1 for radiography, a camera 2 for collecting the appearance of the toughened glass 4 to be detected, a high-speed computer 3 for analysis and calculation and a track speed real-time measuring device 5 for measuring the speed of a conveying toughened glass conveying roller way 6, wherein the track speed real-time measuring device 5 is in signal connection with the high-speed computer 3; the camera 2 is in signal connection with the high-speed computer 3; the bottom of the lamp box 1 is provided with a plurality of rows of round holes 8, two adjacent rows of round holes 8 at the bottom of the lamp box 1 are distributed at intervals, the distance between two adjacent round holes 8 in one row at the bottom of the lamp box 1 is 70mm, the distance between two adjacent rows of round holes 8 is 60mm, the diameter of each round hole 8 is 50mm, and the camera 2 is a CCD camera.
When the system is used, the test result obtained by the high-speed computer 3 is stored in real time, the system makes preliminary judgment on the test result, and abnormal results are intuitively displayed in a mode of alarming, production line linkage and the like; accurately calculating the diopter of each point of the glass 4 and simultaneously giving a reference index capable of improving the production process; and the high-speed computer 3 can be accessed remotely to check test data, so that the quality of the glass 4 can be monitored simultaneously on site and off site.
Example 2
The online detection method for the flatness of the toughened glass comprises the following steps:
1) The lamp box 1 is arranged at the tail end of a toughened glass 4 production line and above a glass 4 conveying roller way; a camera is arranged at a position above the glass 4 conveying roller way corresponding to the lamp box 1;
2) The glass 4 is uniformly transmitted on a glass 4 transmission roller way through a lamp box 1 and a camera, a round hole 8 at the bottom of the lamp box 1 forms a high-precision high-brightness circular spot lamp curtain, the camera continuously shoots images of circular spots of the lamp box 1 at high speed in the running process of the glass 4, the change of the position of each circular spot along with the movement of the glass 4 is recorded, and shooting signals are transmitted to a high-speed computer 3;
3) The high-speed computer 3 calculates the slope of each point on the surface of the glass 4 through a slope formula to obtain a slope curve of each point of the glass 4 along the transmission direction; calculating a height curve of the surface of the glass 4 through a height formula, and reducing the appearance of the surface of the whole glass 4; the slope formula is as follows: d, the offset of the light spot, and the distance from the lens to the glass 4; slope of The height formula is as follows: y i＝yi-1+Δy＝yi-1 +tan alpha x deltax, y is the relative height of the glass 4, x is the position of the glass 4 along the transport direction;
4) The flatness of the glass 4 is characterized by the difference between the peaks and valleys of each wave, and the refractive power of the glass 4 is characterized by the diopter of each point on the surface of the glass 4; light folding capability according to the following formula F is the focal length of the point, R is the radius of curvature of the point, and diopter unit is md; and obtaining the difference value of the wave crest and the wave trough of each wave of the curve and the focal power at the wave crest and the wave trough, counting the difference value of the wave crest and the wave trough of each scanning line and the diopter of each point on the surface of the glass 4, and quantitatively evaluating the flatness and the image deformation of the glass 4.
Compared with a hawk system, the device directly measures the offset of the midpoint position of each light spot, has large signal, high measurement precision and low error, and because the measured parameters are simple, the device increases the number of the light spots, and the camera 2 adopts a continuous high-speed sampling mode, can obtain denser measurement information, so as to improve the measurement accuracy; compared with ilook systems, the lamp box 1 and the camera 2 are used for replacing lasers and laser receivers, so that the cost is low and the debugging is convenient.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (1)
1. The toughened glass flatness online detection method is characterized by adopting a toughened glass flatness online detection system, comprising a lamp box for radiography, a camera for collecting the appearance of the toughened glass to be detected, a high-speed computer for analysis and calculation and a track speed real-time measurement device for measuring the speed of a conveying toughened glass roller way, wherein the track speed real-time measurement device is in signal connection with the high-speed computer; the camera is in signal connection with the high-speed computer; the camera is a CCD camera; the bottom of lamp house is opened there is the multirow round hole, adjacent two rows of round holes looks interval distribution in lamp house bottom, adjacent two round hole intervals in a row in lamp house bottom are 70mm, and adjacent two rows of round hole interval is 60mm, the round hole diameter is 50mm, include the following step:
1) The lamp box is arranged at the tail end of the toughened glass production line and above the glass conveying roller way; a camera is arranged at a position above the glass conveying roller way corresponding to the lamp box;
2) The glass is uniformly transmitted on a glass transmission roller way and passes through a lamp box and a camera, a round hole at the bottom of the lamp box forms a high-precision high-brightness circular spot lamp curtain, the camera continuously shoots images of circular spots of the lamp box at high speed in the running process of the glass, the position change of each circular spot along with the movement of the glass is recorded, and shooting signals are transmitted to a high-speed computer;
3) The high-speed computer calculates the slope of each point on the surface of the glass through a slope formula to obtain a slope curve of each point of the glass along the transmission direction; calculating a height curve of the glass surface through a height formula, and reducing the appearance of the whole glass surface; the slope formula is as follows: d, the offset of the light spot, and the distance from the lens to the glass; slope of ; The height formula is as follows: y is the relative height of the glass, x is the position of the glass along the conveying direction;
4) The difference value between the wave crest and the wave trough of each wave is used for representing the flatness of the glass, and the diopter of each point on the surface of the glass is used for representing the refractive power of the glass; light folding capability according to the following formula ，F is the focal length of the point, R is the radius of curvature of the point, and diopter unit is md; and obtaining the difference value of the wave crest and the wave trough of each wave of the curve and the focal power at the wave crest and the wave trough, counting the difference value of the wave crest and the wave trough of each scanning line and the diopter of each point on the surface of the glass, and quantitatively evaluating the flatness and the image deformation of the glass sheet.
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| CN113074660B (en) * | 2021-03-26 | 2022-09-20 | 深度光学科技(天津)有限公司 | Surface shape measuring method for large-size transparent object |
| CN114136243B (en) * | 2021-10-18 | 2024-08-02 | 广州国显科技有限公司 | Device applied to measuring flatness of display panel |
| CN115790461A (en) * | 2022-11-18 | 2023-03-14 | 铜陵有色金属集团股份有限公司金冠铜业分公司 | Device and method for measuring flatness and position of casting mold in real time |
| CN119394246B (en) * | 2024-12-30 | 2025-03-21 | 远东幕墙(珠海)有限公司 | Glass arch detection method and related device |
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