CS240029B1 - A method for cooling a continuous strip of downward-shaped glass and a method for performing the method - Google Patents

Abstract

The invention relates to the field of flat glass, specifically to the problem of cooling a continuous strip of glass formed by downward overflow and drawing by means of drawing rollers located in a vertical drawing chamber. The essence lies in the fact that the cooling air flows by natural draft arising from the temperature difference in the upper and lower parts of the strip of glass through continuous channels (9) equipped in the lower part with control flaps (11) and in the upper part with a draft (12). Between the continuous channels (9) and the strip (1) of glass there are partial closed spaces (8), formed by heat-removing surface members (7) located between the drawing rollers (4). Under the continuous cooling channels (9) there is a separate after-cooling fan (13) and under it, preferably, hollow metal coolers (14). The solution is intended primarily for the production of flat glass, but it can also be used in the production of glass tubes and the like.

Description

The invention relates to a method of cooling a continuous downflow shaped glass sheet ₇ , in which the heat sheet is controlled to remove heat indirectly over a thermally conductive surface by a cooling air flow ₍ directed upstream of the glass sheet). a drawing chamber surrounding the strip of glass in which the drawing rollers, the surface heat-removing members, the heating means and the fan are located.

In patent V ₀ Britain no. 1,354,006 discloses a method of cooling a continuous ribbon-shaped downward said glass ribbon removes heat controlling flow of cooling the high velocity air flowing in a confined space behind the wall of a material of high thermal conductivity in the direction The cooling air flow in the confined spaces is induced by suction. The apparatus for carrying out the method comprises one or more superposed opposed pairs of cooling chambers / set in the walls of a vertical draw chamber below the draw rollers.Each cooling chamber is on the side facing the glass strip, it is enclosed by heat-removable silicon carbide plates of high thermal conductivity and low thermal expansion. In the chilling chamber there is a block for possible electric heating and an exhaust valve is connected to each chamber átor.

A disadvantage of the method is that the cooling air flow is created by forced suction fans and thus the method is energy intensive. The device is relatively complex in design and there is an open space between the glass strip and the heat-removing surface members where uncontrollable air flow can occur.

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These disadvantages are eliminated or substantially reduced by the method according to the invention, which is characterized in that the cooling air flows through a natural draft resulting in a temperature difference in the upper and lower part of the glass strip. heat-removable sheet-like sheet members are located between the draw rollers to form partial enclosed spaces between the glass web and continuous cooling channels provided with control flaps at the bottom, and at least one cooling fan separated from them at the top and below the cooling channels. hollow metal coolers are located under the cooling fan ·

The method according to the invention is less energy-intensive, since the cooling air flows spontaneously and the fan is used for efficient cooling, which may be supplemented by possibly hollow metal coolers. The space between the glass strip and the heat-removable flat members is closed so that unregulated air currents can occur. Another advantage is the relatively simple construction of the device.

An exemplary embodiment of the invention is described below and schematically shown in the accompanying drawings, in which: FIG.

Underneath the forming apparatus (not shown) from which the continuous glass strip 1 flows, there is a thermally insulated drawing chamber 3 in the movable supporting structure 2, in which pairs of opposing drawing rolls 5 with weights 5 are placed for their pressing against the strip.

In the side walls there are viewing windows 6 at selected locations. Between the pairs of superposed draw rollers 4 are formed shaped heat-removable sheets 7 of refractory sheet, which create partial enclosures 8 between them and the strip 8. the members 7 and the walls of the drawing chamber 3 forms a continuous cooling channels 9 in which _f reheating heating means 10.Chladicí channels 9 are at the bottom of the control damper 11 for supplying cooling air in the upper part exhaust 12 for its odvádara-FY Under cooling channels 9 a cooling fan 13 is located separately below and below it

15 ·

The device works as follows:

A continuous sheet of glass 1, discharged from the forming apparatus (not shown), proceeds to the drawing chamber 3 and is drawn off by pairs of opposing draw rollers 4 rotating against each other by drive 15 and their downforce is applied and controlled the heat-removable surface members 7 which are cooled from the outside by air jets rising in a natural pull against the direction of movement of the glass ribbon 1, the amount of cooling air being controlled by the regulating flap 11 or thermally adjusted by switching on the heating means 10. it further reduces the aftercooler by a fan 13 and a pair of hollow metal coolers 14.

Claims (3)

SUBJECT OF THE INVENTION 240 029 CLAIMS 1. A method for cooling a continuous downstream shaped glass web, in which controlled heat removal of the glass web is controlled indirectly through a thermally conductive surface by a flow of cooling air directed against the direction of travel of the glass web. at the top and bottom of the glass strip · Apparatus for carrying out the method according to claim 1, comprising a vertical drawing chamber surrounding a strip of glass in which the drawing rollers, surface heat-removable members, reheating means and a fan are located, characterized in that the heat-removable flat-members (7) are refractory are located between the draw rollers (4) and form partial enclosed spaces (8) between the glass web (T1 ') and the continuous cooling channels (9) provided at the bottom with control flaps (11) and at the top of the exhaust (12) and below the cooling channels (9) at least one cooling fan (13) separated from them Device according to claim 2, characterized in that hollow metal coolers (14) are located below the after-cooling fan (13).