EP2619554A2 - Dispositif et procédé pour détecter des points défectueux dans du verre flotté produit de façon continue - Google Patents

Dispositif et procédé pour détecter des points défectueux dans du verre flotté produit de façon continue

Info

Publication number
EP2619554A2
EP2619554A2 EP11817464.8A EP11817464A EP2619554A2 EP 2619554 A2 EP2619554 A2 EP 2619554A2 EP 11817464 A EP11817464 A EP 11817464A EP 2619554 A2 EP2619554 A2 EP 2619554A2
Authority
EP
European Patent Office
Prior art keywords
glass
float glass
glass ribbon
scanning
version
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP11817464.8A
Other languages
German (de)
English (en)
Inventor
Wolfgang Zorn
Peter Krug
Winfried Baller
Florian Bader
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Grenzebach Maschinenbau GmbH
Original Assignee
Grenzebach Maschinenbau GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Grenzebach Maschinenbau GmbH filed Critical Grenzebach Maschinenbau GmbH
Publication of EP2619554A2 publication Critical patent/EP2619554A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • G01N21/892—Investigating the presence of flaws or contamination in moving material, e.g. running paper or textiles characterised by the flaw, defect or object feature examined
    • G01N21/896—Optical defects in or on transparent materials, e.g. distortion, surface flaws in conveyed flat sheet or rod
    • 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
    • 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
    • G01N21/8903—Optical details; Scanning details using a multiple detector array

Definitions

  • the invention relates to an apparatus and a method for detecting
  • DE 19643 017 C1 discloses a method for determining optical defects, in particular the refractive power, in large-area panes of a transparent material such as glass, in which by means of projecting a defined pattern onto the glass and imaging this pattern onto a camera the observed image is evaluated. This occurs because a light-dark sequence of the raster pattern is imaged in each case on a number of adjacently arranged pixels of the camera and the number is an integer multiple of the light-dark sequence.
  • the object of this invention is to specify a method with the optical error in at least one dimension of a disc without
  • Reference patterns can be determined locally. Defects in a continuous production process of float - glass can not be determined hereby.
  • Lighting device wherein the focus is on the glass and the video camera generates signals depending on the quality of the glass and these are evaluated.
  • the object to be achieved to provide a method in which no dead zones are present and the strength of the deflection ⁇ refractive power) and the size of the glass defect can be determined.
  • a measurement of the core of the defects in the glass should be possible.
  • a lighting device in that a lighting device is used whose color and / or intensity changes from one outer edge to the other, further,
  • the viewing spot of the video camera is in the fault-free state of the glass approximately in the middle of the lighting device, in that the illumination device is assigned two video signals ui , u 2 according to color and / or intensity, and
  • the device according to the invention is therefore based on the object of introducing a device and a method with which, during the ongoing process of producing a strip of liquid glass, a so-called float glass, the formation of imperfections, for example in the form of inclusions, blisters or similar undesirable phenomena, can be constantly detected and monitored.
  • Fig. 1 a perspective plan view of an inventive
  • FIG. 2 shows a front view of the device according to Fig.1,
  • FIG. 3 shows a view from above of the device according to Fig.1 f
  • FIG. 4 a side view of the device of FIG. 1
  • Fig. 1 shows a perspective top view of a device according to the invention.
  • the bird's-eye view shows the bridge-like overall conception of the glass ribbon continuously flowing from the melting furnace
  • Fig. 2 shows a front view of the device according to Fig.1.
  • the maintenance bridge 10 can be seen here in section, which is supported on the base frame 6.
  • a web of flat glass 7 is sketched here on a conveyor roller 8, which is mounted on a cross member 9 and is driven by a drive 5.
  • As upper end of the base frame 6 is above the
  • Guard rail of the maintenance bridge 10 to recognize the mounting bridge 3 for the scan sensors 2 in section.
  • 11 here is the track for a lighting device 17 and 12 shown the positional support for this lighting device.
  • On the left side of the entire device is a lifting device 13 of
  • a corresponding lifting device 13 is also located on the right side of the mounting bridge. 3
  • Adjusting a scan sensor by means of the pivotable target device 16 are shortened so much compared to the prior art that a continued running of the glass ribbon can be economical. Because it can, from an economic point of view, the temporary failure of the possibility of detection of defects compared to the previously required elaborate breaking and melting of the
  • An additional illumination device 4 is shown in section on the right side of the maintenance bridge 10, analogous to a corresponding one
  • FIG. 3 shows a view from above of the device according to FIG.
  • the spatial allocation of the support 12 for the lighting device 17 can be seen better here. From this position, the adjusting devices 14 (8 pieces are shown here) are clearly visible for the scanning sensors 2.
  • These adjusting devices 14 can be raised and lowered not only by means of the lifting device 13 as a whole with the scanning sensors 2, but additionally each have the possibility of being in all three
  • the scanning sensors 2 it is necessary for the scanning sensors 2 to be able to move both in the positive and in the negative X direction in the direction of the longitudinal extension of the mounting bridge 3, here referred to as the X direction, in order to ensure a gapless combination of the images of all involved Scan sensors 2 over the entire width of the glass sheet to be checked. That is, in this way it can be ensured by control technology that an image of a scan sensor 2 stops where the image of the adjacent scan sensor 2 begins.
  • FIG. 4 shows a side view of the device according to FIG. 1.
  • Adjusting device 14 shown in section. 16 denotes a pivotable target device 16 whose function is explained in more detail in the description of FIG. 6. Below, the lighting device 17 with the associated fenders 15, of which only the left is designated to recognize.
  • the cross member 19 which is connected to the base frame 6, carries the main carrier 18 of the lighting device.
  • the running rail 11 which can be seen in the Figure 2 in longitudinal view, shown in cross section.
  • the running rail 1 serves the purpose of pulling out the lighting device 17 during operation
  • a cooling device 21 provides for the cooling of the lighting device 17 and thus for the maintenance of the correct operating temperature of the lighting device 17, the bulbs 20,23.
  • FIG. 5 is a perspective view of the lighting means 20, 23 in FIG.
  • the bulbs are appropriately according to the width of the glass ribbon to be illuminated in terms of their longitudinal extent assembled in a modular manner. Together they form, as it were, two parallel light bands, one of which has a line-shaped light source which oscillates in its light intensity and which has another light-emitting means 23 arranged in a line-shaped manner and constant in its light intensity.
  • the frequency of the oscillating light intensity is in this case preferably equal to the line frequency of the line scan camera, or the frequency of driving a scan sensor 2. It is also preferred that these frequencies are in an integer multiple to each other.
  • each scan sensor for example a video camera, lies in the region of the demarcation line in the case of a defect-free lens
  • Luminous means 20 and 23 overlapping, assigned to two bulbs, while the area A2 only the area of the luminous means 23 with the constant
  • Both surfaces A1 and A2 provide different measured values in the region of a pixel-like detection of these optical channels, which, in the range of certain threshold values, allow safe conclusions to be drawn regarding the type and extent of a detected defect.
  • the cooling device 21 acts on the underside of the two light bands.
  • Cover 22 which also acts as a light diffuser, forms the end of the light bands opposite the underside of the glass strip to be tested.
  • a second version of the above-described bulbs 20 and 23 may be provided, which from the position forth (parallel to the 1st version) with the above-described 2nd version of Adjusting device 14, and the respective associated scan sensor 2, correspond.
  • This additional arrangement ensures in the case of repair or the entire replacement of a lighting unit, or parts thereof, by means of an automatic switching operation on this 2.Version the undisturbed operation of the entire device according to the invention.
  • the above-mentioned additional tilting device on each adjusting device 14 for the respective scanning sensor 2 is not necessary in this case, since the second version of an adjusting device 14 is arranged directly above the center line of the second version of the lighting means 20 ,.23.
  • the respective second version be it the adjusting device 14 or the lighting means 20 or 23, are arranged upstream of the first version in order to detect approaching fault points in advance and to supply them to a further evaluation. It goes without saying that these second versions must also have corresponding additional pivotable target devices 16.
  • FIG. 6 shows a functional sketch of the adjustment of a scan sensor.
  • the glass tape to be tested runs on the sketched roles. If the readjustment or readjustment of a scan sensor 2 becomes necessary, the adjusting device 14 of FIG.
  • This target device 16 has fixed markings in the form of simple lines and / or crossed lines of specific thickness and / or color, by means of which the respective sensor 2 can automatically align itself in a desired nominal position according to a defined program.
  • the corresponding scan sensor 2 is in this case raised as far as corresponds to the distance of the target device 16 from the glass ribbon.
  • the adjusting device 14 subsequently adjusts the relevant scanning sensor 2 in accordance with the optical specifications of the target device in its horizontal orientation. After adjustment of the scan sensor, the carrier device 16 pivots back again and the scan sensor descends again to its predetermined working height above the glass plate 7.
  • the additional illumination device 4 has additional illumination means such as LED, UV emitters, quartz lamps, xenon emitters or helium. Spotlights that offer additional possibilities for the detection of undesired glass properties. These depend on the type of glass and the special requirements of the glass mixture produced and thus the respective glass parameters or glass defects to be detected.
  • an additional device for measuring the glass thickness for example by means of laser or ultrasound, each
  • Scanning sensor 2 positionally assigned to be provided. With such a device, the thickness of the produced glass ribbon, dissolved in the transverse direction and longitudinal direction, additionally detected during the manufacturing process and
  • a device for measuring and monitoring stresses in the glass band is provided simultaneously with the detection of defects in the float glass.
  • a method is proposed in which polarized light is sent into the glass ribbon, wherein occurring stresses cause a birefringence, and the emerging light beam is analyzed to determine the changes caused by the birefringence and thus the occurring stresses.
  • the determination of these stresses is carried out by continuously sweeping the width of the glass ribbon, the registration of said changes in the type of birefringence and the simultaneous measurement of the temperature at the respective, respectively swept, location. From the measured changes of
  • the area exposed to the incident polarized light beam preferably has a diameter of less than 20 mm.
  • Temperature measurement can be done for example with an optical pyrometer.
  • the control of the complex motion processes and the signal processing of the sensors used requires a special control program. LIST OF REFERENCES

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
  • Length Measuring Devices By Optical Means (AREA)

Abstract

L'invention concerne un procédé et un dispositif pour détecter des points défectueux dans une bande de verre flotté produite de façon continue au moyen de l'essai d'une bande de verre agencée transversalement au sens de transport et observée en lumière transmise, caractérisé en ce qu'il présente les caractéristiques suivantes : a) le flux d'une bande de verre flotté est contrôlé de façon continue au moyen d'un pont de fixation structuré de façon modulaire et de capteurs de scan fixés dessus ainsi qu'au moyen de deux appareils radiographiques disposés transversalement à la bande de verre, b) chaque capteur de scan peut être orienté au moyen d'un appareil d'ajustage selon les 3 coordonnées de l'espace dans le sens positif et le sens négatif et réglé de façon fine au moyen d'un appareil cible pouvant basculer vers l'intérieur sous la forme d'un plan de mesure artificiel, c) les moyens d'éclairage sont refroidis au moyen d'un appareil de refroidissement.
EP11817464.8A 2010-09-24 2011-09-21 Dispositif et procédé pour détecter des points défectueux dans du verre flotté produit de façon continue Withdrawn EP2619554A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102010046433A DE102010046433B4 (de) 2010-09-24 2010-09-24 Vorrichtung und Verfahren zum Detektieren von Fehlstellen in kontinuierlich erzeugtem Float-Glas
PCT/DE2011/001772 WO2012041285A2 (fr) 2010-09-24 2011-09-21 Dispositif et procédé pour détecter des points défectueux dans du verre flotté produit de façon continue

Publications (1)

Publication Number Publication Date
EP2619554A2 true EP2619554A2 (fr) 2013-07-31

Family

ID=45592108

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11817464.8A Withdrawn EP2619554A2 (fr) 2010-09-24 2011-09-21 Dispositif et procédé pour détecter des points défectueux dans du verre flotté produit de façon continue

Country Status (12)

Country Link
US (1) US20130176555A1 (fr)
EP (1) EP2619554A2 (fr)
JP (1) JP2013539026A (fr)
KR (1) KR20130046443A (fr)
CN (1) CN103154710A (fr)
BR (1) BR112013007477A2 (fr)
DE (1) DE102010046433B4 (fr)
EA (1) EA201390358A1 (fr)
IL (1) IL225327A0 (fr)
MX (1) MX2013003334A (fr)
UA (1) UA104966C2 (fr)
WO (1) WO2012041285A2 (fr)

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DE102011109793B4 (de) * 2011-08-08 2014-12-04 Grenzbach Maschinenbau Gmbh Verfahren und Vorrichtung zur sicheren Detektion von Materialfehlern in transparenten Werkstoffen
CA2928875C (fr) 2013-11-01 2023-06-20 Tomra Sorting Nv Procede et appareil de detection de matiere
DE202014004779U1 (de) 2014-06-10 2014-07-01 Grenzebach Maschinenbau Gmbh Vorrichtung zur schnellen und sicheren Messung von Verzerrungsfehlern in einem produzierten Floatglas-Band
DE102014008596B4 (de) 2014-06-10 2016-01-28 Grenzebach Maschinenbau Gmbh Vorrichtung und Verfahren zur schnellen und sicheren Messung von Verzerrungsfehlern in einem produzierten Floatglas - Band
CN104155437B (zh) * 2014-08-27 2016-03-02 珠海科域生物工程有限公司 胶体金试纸卡自动加卡传送装置
CN108426606A (zh) * 2018-03-12 2018-08-21 湖南科创信息技术股份有限公司 浮法玻璃生产线冷端应力与厚度的检测系统
CN108855992B (zh) * 2018-07-12 2024-05-14 机械科学研究总院海西（福建）分院有限公司 一种具有不良品剔除功能的玻璃检测机构
CN113195182B (zh) * 2018-12-21 2024-02-13 日本电气硝子株式会社 玻璃板制造方法以及玻璃板制造装置
DE102021117605A1 (de) 2021-07-07 2023-01-12 Pma/Tools Ag System und Verfahren zur Überwachung der Güte einer Fahrzeugscheibe
CN117333467B (zh) * 2023-10-16 2024-05-14 山东景耀玻璃集团有限公司 基于图像处理的玻璃瓶瓶身瑕疵识别检测方法及系统

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Also Published As

Publication number Publication date
WO2012041285A2 (fr) 2012-04-05
IL225327A0 (en) 2013-06-27
US20130176555A1 (en) 2013-07-11
UA104966C2 (uk) 2014-03-25
MX2013003334A (es) 2013-06-28
BR112013007477A2 (pt) 2016-07-19
DE102010046433B4 (de) 2012-06-21
EA201390358A1 (ru) 2013-07-30
CN103154710A (zh) 2013-06-12
KR20130046443A (ko) 2013-05-07
JP2013539026A (ja) 2013-10-17
DE102010046433A1 (de) 2012-03-29
WO2012041285A3 (fr) 2012-07-05

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