FI103784B - Method and apparatus for supporting rolls of a furnace and / or tempering compartment of a glass plate horizontal tempering plant - Google Patents

Description

103784

Method and apparatus for supporting rolls of a furnace and / or tempering section of a glass tempering plant.

The problem with horizontal tempering plants for glass sheets is the excessive increase in the diameter, mass and heat capacity of the furnaces 5 rolls, especially the long rolls required to temper the wide glasses. In the hardening compartment, the large-diameter rollers in combination with the blow nozzles prevent the hardening air from escaping and reduce the hardening power.

10 The high mass of the furnace rolls is disadvantageous in particular because the surface temperature of the ceramic rolls is sensitive to changes in load. After a break, for example, the surface of the roll is very hot, whereby the incoming glass receives more heat than the glass of the next loading.

15

It is an object of the invention to provide a method and apparatus for supporting rolls of a glass plate horizontal annealing plant so as to substantially reduce said problems.

This object is achieved by the method of the invention by supporting the roll with an air cushion created by blowing air into an air passage below the roll which is bounded to the outer surface of the roll and from which air 25 is directed to discharge into the furnace or tempering compartment. The device according to the invention is characterized in that the lower half of the roll; The doll has a gutter support member which, together with the outer surface of the roll, delimits the curved air channel and that the device includes means for blowing air into the channel.

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In the following, some exemplary embodiments of the invention will be described in more detail with reference to the accompanying drawing, in which: •. Figure 1 schematically shows a vertical sectional view of the furnace according to the invention at the rolls and Figure 1A-A in section A shows the cross-section of the roll; Figures 2A-C illustrate various alternatives for cross-sectioning the roll and implementing an air cushion confined to the roll.

In Figure 1, the roller 1 is supported by rotation with bearings 2 between the walls of the furnace 5. The air channel is connected by a rotary connection 3 to the end of the roll 1 outside the oven. The fan 5 draws hot air from the furnace through a conduit 6 and, through the heater 4, presses it into the cavity 11 of the hollow roll 1, from which air is discharged through the holes 8 in the roll casing back into the furnace 10. To support the roll, there is a trough 13 beneath it which prevents air from discharging down and to the sides. At the same time, the trough 13 and the outer surface of the roll define a curved air passage 12 into which the discharged air forms an air cushion supporting the roll 1. Thus, the rolls 1 can be made thinner and / or longer without the risk of the rolls hanging. The lower mass of the rolls allows for better temperature stabilization. On the other hand, the construction allows for tempering of wider glass sheets. Also, in view of the air support and convection heating of the glass, it is advantageous that the air blown into the furnace is directed substantially upwardly from the holes 8.

• · ·: Y: The air blown into the oven can also be cooled, if necessary, by suctioning more or less cold outdoor air * · 25 through the adjustable throttle 7 into the roller 1: ·. to become airborne.

t · «.. The corresponding roll cushion support can also be used in the 4 4 * t> [* hardening compartment, whereby all the inflatable air is extracted from the outside, where it acts as cold hardening air and · * ·,. thus reducing the need for blast air blowing by 4 µ * ''. through the nozzles.

4 4 4 4 4 «

The air cushion support according to the invention may also be provided on a solid roll. This possibility is shown in Figure 2A. Therein, air is discharged from the pressure duct 14 into the air duct 12 between the roller 1 and the trough 3 and further up the edges of the duct 3 103784 12 into the furnace or tempering section along the sides of the roller. Here, too, an additional advantage is achieved by stabilizing the temperature of the furnace roll 1 by means of an air flow flushing the surface of the roll or by further blowing it into the tempering compartment.

Figure 2B differs from the previous only in that the roller 1 has through holes 9 through which air can flow from the duct 12 to the furnace or tempering section. Fig. 2C differs from the previous ones in that the roll is hollow and its casing is provided with holes 8, whereby air can flow from the curved air cushion channel 12 into the roll cavity 11 and further through the holes 8 into the furnace or tempering compartment.

It is also possible that a sufficiently porous and air permeable roll material acts in the same manner as a perforated roll.

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Claims (8)

103784 A method for supporting rolls in a furnace and / or tempering compartment of a horizontal hardening plant, characterized in that the roll (1) is supported by an air cushion created by blowing air into an air duct (12) below the roll (1) into the furnace space or tempering compartment against the bottom-10 of the glass plate supported by the rolls. Method according to Claim 1, characterized in that the air duct (12) forming the air cushion discharges air into the furnace space or annealing section through holes (8, 9) in the roll (1). Method according to Claim 2, characterized in that air is formed in the air channel (12) forming the air cushion from the holes (8) of the hollow roll (1, 11), from which the air also discharges upwardly into the furnace space or the tempering compartment. «« < Method according to one of Claims 1 to 3, characterized in that the air duct (12) forming the air cushion (12) discharges into the furnace space or the annealing compartment at the periphery of the channel (12) delimiting the duct (12). · The gaps between the rollers and the roller (1). • · · • · · · · Apparatus for supporting rolls of a furnace and / or tempering part of a 30-ton hardening plant, characterized in that: • · · below the roll (1) there is a trough supporting member (13) which, together with the outside of the roll . 1: air duct (12) and means (5, 14) for blowing air into the duct (12). 35 • · · Device according to Claim 5, characterized in that the roll is hollow and has holes (8). 103784 Device according to Claim 5, characterized in that the roll (1) is solid and has holes (9) extending in the transverse direction. Device according to Claim 5, characterized in that the roll material is so porous that it is easily permeable to air. «I · • I ·« · i · .. • · · i:: • · * · · · · · 0 0 · * · · 1 · · 103784