DK147494B

DK147494B - APPLIANCE FOR HARDENING GLASS PLATES

Info

Publication number: DK147494B
Application number: DK111774AA
Authority: DK
Inventors: Hans-Peter Siemonsen
Original assignee: Saint Gobain
Priority date: 1973-03-02
Filing date: 1974-03-01
Publication date: 1984-09-03
Also published as: BR7401514D0; DE2408084B2; NO133627B; FR2219912B1; JPS5046719A; ES423805A1; NL171976B; DE2408084A1; SE404356B; GB1424954A; IT1011530B; NO133627C; JPS5711852B2; NL171976C; NL7402801A; NO740726L; FR2219912A1; BE811799A

Description

U7494U7494

Opfindelsen angår et apparat til hærdning af glasplader ved pludselig afkøling af disse med luftstrømme, og af den art, der omfatter to over for hinanden anbragte, stillestående eller bevægelige blæsekamre, der 5 hvert på sin mod glaspladen vendende frontplade har et stort antal blæsedyser, hvis længde er stor i forhold til deres diameter.BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to an apparatus for curing glass sheets by the sudden cooling of these by air currents, and of the type comprising two opposed, stagnant or movable fan chambers, each having a large number of blowing nozzles facing its glass plate, length is large in relation to their diameter.

Blæsekamre med dyser af denne art kendes fra det tyske patentskrift nr. 830.552. De har den fordel, at 10 luften, som blæses ud og opvarmes ved kontakt med den varme glasplade, nemt siver ud i alle retninger mellem dyserne. Blæsekamre af denne art anvendes derfor hyppigt i praksis.Blown chambers with nozzles of this kind are known from German Patent Specification No. 830,552. They have the advantage that the air, which is blown out and heated by contact with the hot glass plate, easily seeps out in all directions between the nozzles. Therefore, blowing chambers of this kind are frequently used in practice.

Man konstaterer dog, at der ved sådanne blæsekamre 15 er en større risiko for, at glaspladen går i stykker under blæseoperationen. Når glaspladerne ophænges vertikalt og hærdes i denne stilling, begynder bruddet ofte ved den øvre kant af pladen.However, it is found that with such blow chambers 15 there is a greater risk of the glass plate breaking during the blow operation. When the glass panels are suspended vertically and cured in this position, the rupture often begins at the upper edge of the plate.

Blandt forskellige forklaringer er en sandsynlig 20 forklaring den, at glaspladens kantområder afkøles hurtigere end pladens midterområde. Bruddet kan også skyldes, at kantområderne og specielt den øvre kant i nærheden af ophængningsorganerne i begyndelsen af blæseoperationen har en temperatur, der er lavere end i mid-25 terområdet. En medvirkende årsag er også, at der kan forekomme ganske små brud eller brudlinier ved kanterne.Among various explanations, a probable explanation is that the edge areas of the glass plate cool faster than the center area of the plate. The fracture may also be due to the fact that the edge areas and especially the upper edge near the suspension means at the beginning of the blowing operation have a temperature lower than in the middle region. Another contributing factor is that very small ruptures or rupture at the edges may occur.

Opfindelsen giver anvisning på et apparat, som gør det muligt at reducere risikoen for brud af glaspladen under blæseoperationen, dog uden at give afkald på for-30 delene ved blæsekamre med blæsedyser.The invention provides an apparatus for reducing the risk of breakage of the glass plate during the blow operation, however, without sacrificing the advantages of blow chambers with blow nozzles.

Med henblik herpå er apparatet ifølge opfindelsen ejendommeligt ved, at der ud for i det mindste en del af kantpartiet af den glasplade, der skal hærdes, og mellem de til hvert blæsekammer hørende dysers fælles udmun-35 dingsplan og det pågældende blæsekammers frontplade findes en med glaspladen i det væsentlige parallel skærm, hvis bredde i retning vinkelret på kanten af glaspladen er større end amplituden af den relative rotations- eller 147494 2 svingningsbevægelse, blæsekamrene bibringes i forhold til glaspladen, således at glaspladens kantparti vedvarende befinder sig i skærmens læ.To this end, the apparatus according to the invention is peculiar in that at least a part of the edge portion of the glass plate to be cured and between the common opening plane of the nozzle belonging to each blowing chamber and the front plate of the blowing chamber concerned the glass plate is essentially a parallel screen whose width in the direction perpendicular to the edge of the glass plate is greater than the amplitude of the relative rotational or oscillating motion, the blowing chambers are imparted to the glass plate so that the edge portion of the glass plate remains permanently in the shelter of the screen.

Apparatets virkning kan forklares ved, at hvert 5 blæsekammers kølevirkning nedsættes i læ af skærmene. Sandsynligvis opstår der et mindre overtryk mellem glaspladens overflade og skærmene, således at den kolde luft, der udgår fra dyserne, ikke kan strømme ud så hurtigt som i den resterende del af apparatet. Det kan desuden 10 formodes, at en vis del af den luft, der opvarmes af glasset og hidrører fra pladens midterområde, blandes med koldere luft hidrørende fra dyserne i skærmens læzoner, hvorved man undgår en for hurtig afkøling af glaspladen i dette område af apparatet.The effect of the apparatus can be explained by the cooling effect of every 5 blowing chambers in the shelter of the screens. Probably a slight overpressure occurs between the surface of the glass plate and the screens, so that the cold air exiting the nozzles cannot flow out as quickly as in the remaining part of the apparatus. In addition, it can be presumed that a certain portion of the air heated by the glass originating from the center region of the plate is mixed with colder air from the nozzles in the reading zones of the screen, thereby avoiding too rapid cooling of the glass plate in this area of the apparatus.

15 Under anvendelse af rørformede dyser af en længde på sædvanligvis 35-120 mm, opnår man gode resultater, hvis skærmene befinder sig i en afstand fra 5 - 25 mm og fortrinsvis 10 - 15 mm fra dysernes udgangsåbning.Using tubular nozzles of usually 35-120 mm in length, good results are obtained if the screens are at a distance of 5 - 25 mm and preferably 10 - 15 mm from the outlet opening of the nozzles.

Herved opnås der mellem skærmen og kammerets for-20 plade et tilstrækkeligt mellemrum til at sikre en nem gennemstrømning af blæseluften hidrørende fra det midterste område mellem kamrene.Thereby, a sufficient space is obtained between the screen and the front plate of the chamber to ensure easy flow of the blowing air from the middle area between the chambers.

Opfindelsen forklares nærmere i det følgende under henvisning til den skematiske tegning, hvor 25 fig. 1 viser et lodret snit gennem et apparat i- følge opfindelsen til hærdning af glasplader, som ophænges i vertikal stilling, og fig. 2 et planbillede af en anden udførelsesform for blæsekammeret, hvor skærmen strækker sig over hele omkredsen af glaspladen.The invention is explained in more detail below with reference to the schematic drawing, in which FIG. 1 is a vertical section through an apparatus according to the invention for curing glass panels suspended in a vertical position; and FIG. 2 is a plan view of another embodiment of the blower chamber, the screen extending over the entire circumference of the glass plate.

Den i fig. 1 viste glasplade 1 ophænges vertikalt ved hjælp af ikke viste gribeorganer. De to blæsekamre 2 og 3 har samme konstruktion og består af en kasse 4,5 med frontsiden 6,7 vendende mod glaspladen.The FIG. 1, glass plate 1 is suspended vertically by gripping means (not shown). The two blow chambers 2 and 3 are of the same construction and consist of a box 4,5 with the front side 6.7 facing the glass plate.

33 Frontsiderne 6, 7 har rørformede dyser 8,9. Gennem ledninger 10,11 er kamrene forbundet med en blæser.33 The front sides 6, 7 have tubular nozzles 8.9. Through wires 10,11, the chambers are connected to a fan.

Dyserne 8,9 har en længde på ca. 35 - 100 mm og en U7494 3 inderdiameter på 3 - 8 mm, fortrinsvis 5 mm og de er anbragt i en afstand på' 10 - 20 mm fra hinanden. Disse dyser er anbragt i rækker og forsat for hinanden fra række til række. Afstanden mellem dysernes udgangsåbning 5 og glaspladen er på ca. 30 - 45 mm og fortrinsvis mellem 35 og 40 mm. Under blæseoperationen meddeles blæsekamre-ne 2 og 3 sædvanligvis en svingende eller roterende bevægelse, f.eks. en cirkulær translationsbevægelse.The nozzles 8.9 have a length of approx. 35 - 100 mm and an U7494 3 inner diameter of 3 - 8 mm, preferably 5 mm and spaced 10 to 20 mm apart. These nozzles are arranged in rows and arranged for each other from row to row. The distance between the outlet opening 5 of the nozzles and the glass plate is approx. 30 to 45 mm and preferably between 35 and 40 mm. During the blowing operation, the blowing chambers 2 and 3 are usually given a pivoting or rotating motion, e.g. a circular translation movement.

Langs den Øvre kant af glaspladen 1 er der på 10 hver kasse 2 og 3 en skærm, henholdsvis 12 og 13.Along the upper edge of the glass plate 1, on each box 2 and 3 there is a screen 12 and 13 respectively.

Denne skærm har en bredde B på i det mindste 100 mm, men kan afhængigt af dimensionerne af glaspladen have en bredde på op til 300 mm. Denne skærm er placeret i en sådan højde, at den strækker sig et godt stykke over og 15 et godt stykke under overkanten af glaspladen 1, således at den altid dækker over glaspladens kant, uanset blæsekamrenes relative svingnings- eller rotationsbevægelse i forhold til glaspladen. Når dyserne har en længde på 35 mm, er afstanden mellem skærmen 12, 13 20 og dysernes udgangsåbning ca. 10 mm. Skærmen 12 eller 13 udgøres af en tynd metalplade. Der efterlades mellem skærmen og kassens frontplade 6 eller 7 en afstand på ca. 25 mm, som er tilstrækkelig til, at den største del af luften fra det midterste område af kammeret kan 25 sive ud.This screen has a width B of at least 100 mm, but may have a width of up to 300 mm depending on the dimensions of the glass plate. This screen is positioned at such a height that it extends well above and well below the top of the glass plate 1, so that it always covers the edge of the glass plate, regardless of the relative oscillation or rotational movement of the blowers relative to the glass plate. When the nozzles have a length of 35 mm, the distance between the screen 12, 13 20 and the outlet opening of the nozzles is approx. 10 mm. The screen 12 or 13 is a thin metal plate. A distance of approx. 25 mm, which is sufficient to allow most of the air from the middle region of the chamber to leak out.

Ved at ændre afstanden mellem skærmen og dysernes udgangsåbning fra 5 - 25 mm, kan den ønskede virkning opnås under de optimale betingelser i hvert enkelt tilfælde. Hvis denne afstand er for lille, risikerer man 30 at der tilbageholdes for meget luft i mellemrummet mellem skærmene og glaspladen, således at man ikke opnår den ønskede hærdningsgrad. Når afstanden er for stor, forringes skærmenes virkning. Afstanden skal justeres på en sådan måde, at en del af den varme luft, der hid-35 rører fra midterområdet, tvinges til at passere mellem skærmene og glaspladen. På denne måde vil den kolde luft fra dyserne opvarmes i området mellem skærmene. DenneBy changing the distance between the screen and the outlet opening of the nozzles from 5 - 25 mm, the desired effect can be achieved under the optimal conditions in each case. If this distance is too small, 30 risk of retaining too much air in the space between the screens and the glass plate so that the desired degree of cure is not achieved. When the distance is too large, the effect of the screens deteriorates. The spacing must be adjusted in such a way that a portion of the hot air flowing from the center region is forced to pass between the screens and the glass plate. In this way, the cold air from the nozzles will be heated in the area between the screens. This

Claims

147494 effect counteracts a too sudden cooling of the area at the upper edge of the glass plate. FIG. 2 shows another exemplary embodiment in which the screen 15 extends over the entire circumference of the glass plate 16. In this embodiment the data given above applies to the dimensions of the screen 15, its position with respect to the edge of the glass plate 16 and the distance to the outlet opening of the nozzles. to the boxes front plate still alive. The full effect of blower chambers with a frame-shaped screen is usually achieved only when the distance A between the upper inner edge and the lower inner edge of the screen is at least twice the width of the screen. 15 PATENT REQUIREMENTS

Apparatus for curing glass sheets by the sudden cooling of these with air currents, and of the type comprising two opposed, stagnant or movable fan chambers (2, 3), each facing its face towards the glass sheet (1) (6, 7) has a large number of blowing nozzles (8, 9), the length of which is large in relation to their diameter, characterized in that at least part of the edge portion of the glass plate to be cured, and between the common orifice plane of each 25 blow chamber (8, 9) and the front plate (6, 7) of said blow chamber (2, 3) is provided with a substantially parallel screen (12, 13; 15) with the glass plate (1) if width in the direction perpendicular to the edge of the glass plate is greater than the amplitude of the relative rotational or oscillatory motion, the blowing chambers are imparted to the glass plate so that the edge portion of the glass plate remains permanently in the shelter of the screen.

Apparatus according to claim 1, wherein the length of the tubular 35 blow nozzles is between 35 and 120 mm, characterized in that the screens (12, 13; 15) are located at a distance of between 5 and 25 mm from the blower.