DE2023213A1 - Convection plate - Google Patents

Description

Convection plate

The invention relates to convection panels of the type as they are used between stacked metal strip rolls (coils) in heat treatment furnaces, e.g. in annealing furnaces. Such annealing furnaces generally contain an enclosing one Shell or hood, within which gas or air circulates will.

Convection plates are used to create an even

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To ensure the passage of annealing gases over / metal strip rolls, the rolls are generally alternately stacked with convection plates in the annealing furnace.

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According to the invention a convection panel is for use. Wärmebehandlungaöfen provided in which 'comprises a number of ^v over each side of the plate extending aieh Gaadurchtrittsöffnungen, wherein the passage openings on one side substantially parallel inj and has each of the Durehtrittaöffnungen substantially parallel walls.

According to the invention is also a convection plate for Use in heat treatment furnaces provided that has a number ™ of support elements that form a grid through which is delimited by a set of essentially parallel gas passage openings extending over the plate.

There may preferably be two sets of through openings, one in each side of the plate.

Furthermore, the total expansion of the gas passage openings in one side up to about 50 # of the surface area α on this side.

Each support element may suitably consist of a metal rod exist. The metal can be forged or cast iron or aluminum or an alloy.

Likewise, a set of gas passage openings in one side Ina can be at right angles to the set of passage openings run on the other side.

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009848/1225

BATH ORIGINAL

The bars forming the grid can be symmetrically arranged to minimize operational deformation and the possibility of disturbance during repeated heating and cooling periods within an annealing furnace.

The plate can be roughly circular with one also circular central mouth or opening.

A number of eyelets, a central '™ ring, or other suitable lifting means may be attached to the plate, depending on the means available for handling the plate. Two eyelets can therefore be attached to the support elements so that they are arranged exactly opposite one another with regard to the opening on its circumference. These eyelets facilitate the use of lifting devices for inserting and removing the convection plates in and out of the annealing furnace. The invention is described below by means of examples with reference to the accompanying schematic drawings. It show: m

Fig.1: plan view of an arrangement of base plates according to an embodiment of a convection plate;

2: a plan view of an arrangement of upper plates according to a further embodiment of a convection plate;

Figure 5 * Ir * 'v5rißensicht another Ausführungsforir a convective ^ plate;

'009848 / J225

BATH ORIGINAL

Pig.4: View in the direction of the arrow ^f A ^f in Fig.3?

Pig.5: plan view of a further embodiment variant a convection plate, and

Fig. 6: Cross-sectional view of part of an annealing furnace,

in which the convolution plate of Figures 3, 4 or 5 is used.

A set 1 of base plates (Fig.1) is generally circular in shape and contains a number of parallel, flat steel bars 2 of unequal width. Parallel air passage openings are delimited by the rods 2. Two central rods 4 are welded to a circular support ring, which is also welded to the immediately adjacent rods 4 lying rods of set 1 is welded.

Referring to Figure 2, there is provided a set 6 of top plates also of generally circular configuration and also including a number of parallel flat steel rods 7 of different widths. Two central pairs of rods B are welded to a support ring 9. The rod set 6 delimits a number of parallel air passage openings 10.

A convection plate according to the invention contains a combination of sets 1 and 6 of base and top plates, which are arranged one above the other, with their respective rods 2 and 7 standing at right angles and the two support rings 5 and 9 vertically one above the other , T) Ie both

0098/18/1225

BATH ORIGINAL

Sets are then welded together and "then form one rigid and solid structure with a central opening.

According to Figures 3 and 4, a convection plate 11 is similar that described above, with the difference that the central bars 12, 13, 14 and 15 and the bars 16, 17, 18 and are shaped so that a central opening 20 in the plate 11 is provided. '

A lifting eye 21 is attached between the rods 12 and 13, while an exactly opposite eye 22 is attached similarly the rods 14 and 15 is attached.

According to Figure 5, a convection plate is similar to that of Fig. 1-4, which has four lifting eyes 24.

The bars can be made of wrought iron, aluminum, or any suitable material, depending on the metal in the annealing furnace using the convection plates.

The rods can be of any suitable size, e.g. 6 »wide and 3/4" thick.

In use, assume the convection plate of Fig.3 is used, metal tape rolls 25, which can consist of sheet steel, stacked on top of each other in an annealing furnace X, where- ' in the case of a convection plate 11, each role separates from the other (see Fig. 6). A fan 26 is a glow or

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Shielding gas, which is maintained at a predetermined temperature, is circulated through the furnace. The gas flows through the air passage openings 3 and 10 down into the central Opening 20 from which it is continued in the circuit. The parallel sides of the air passage openings ensure that the gas can slide continuously over the rollers, so that the amount of heating energy is increased by transmission and radiation on the roles. The glow gas can also through the Opening to get to the center of the rollers.

When the heating cycle is complete, the rollers and convection plates are removed from the stove by using a pulley system or the like. connects with the lifting rings or eyelets.

It is to be understood that the unequal width of the bars contributes to this is intended to be different widths of the glowing roles

adapt so that the rollers are supported on their entire circumference during the heat treatment.

The convection plates according to the invention therefore ensure improved convection in the annealing furnace and an increase in the quantities of material treated per hour of use of the furnace. It was also found that the inventive convection panels help to save three or four hours of cooling time per charge and improve heating performance achieve, e.g. in fuel and HNX gas consumption, during Another advantageous feature is that, due to the support effect achieved by the panels, damage the roll edges is reduced considerably.

0098A8 / 1225

Claims (11)

• Patent claims: 1.) Convection plate for use tn heat treatment ovens _t characterized in that they have a number of over ^ ede plate side extending
Has gas passage openings (3ilO), the
Passage openings (5,10) in one side are essentially parallel and essentially parallel
Have walls. 2.) convection sur use in WRR <üebeh "indlunsrsöfen, characterized geke * η η ζ η et verifiable that it comprises a number of StUtsseleeenten (2,4; £ 10> which form a mesh through which a set ( t _t 6) of It essentially parallel gas ^{passage openings ("2} J, 10 ^ n ^ b ^ delimited over the plate. - II - 009848/1225 BATH 3.) convection plate according to claim 1 or 2, characterized in that it has two sets (1,6) Gag passage openings (3,10), one on each side of the plate. 4.) convection plate according to claim 3 ,. characterized in that the two sets (1,6) of gas passage openings (3,10) are arranged at right angles to one another. 5.) convection plate according to claim 4, characterized in that g e k e nn, that the gas passage openings (3,10) in one side about 50 $ of the entire surface of this Take side. 6.) Convection plate according to any one of the preceding claims, characterized in that it has a central opening (20). 7.) convection plate according to claim 6, characterized in that g e k e η η, that the scope of the opening is limited by a metal ring (5.9). 8.) convection plate according to claim 6, characterized in that a number of lifting rods (21,24) . is arranged around the opening urofang. - III -. 009848/122 5 9.) convection plate according to any one of claims 2 to 8, characterized in that the support elements consist of metal rods (2,4,7,8,12-19). 10.) Convection plate according to claim 9, characterized in that two sets of grids (1,6) against each other are welded at right angles and so a rigid one Form structure, each grid having spaced apart metal bars of unequal width. 11.) A tempering furnace including a transfer plate according to any one of the preceding claims. Dipl.-Ing.H.-D.Ernicke patent attorney 009848/1225 Blank page