DE2118253A1 - Method and device for regulating the air admission in coil coating systems - Google Patents

Description

DEMAG Aktiengesellschaft March 3, 1971

41 D u i s b u r g §671 - Be / Ka

Wolfgang-Reuter-Platz

Method and device for regulating the air admission

for strip coating systems

The invention relates to a method for regulating the action of v <.jm that occurs from a nozzle knife. in 3and coating plants, e.g. B-. Hot-dip galvanizing plants, coated strips serving knife-shaped air atmospheres and a device for carrying out the process consisting of a nozzle arranged transversely to the moving strip with a gap-shaped outlet opening directed towards the coated edge.

In the case of such surface coating systems, which serve the purpose serve the liquid zinc coating on hot-dip galvanized Tapes to the correct size using air pressure To scrape nut knives, it is necessary to use them len occurring on both side edges of the tape Zinc coatings to be stripped off * so that over the entire width the zinc coating is evenly thick.

:. ^r un it is known to meet these requirements

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to intensify the air jet at the two rare that no thickening of the zinc layers occurs,. so that the zihk cover is evenly thick. To this Purpose, the gap must be narrowed at the edges, thus more zinc by increasing the air speed is blown away at the edges. But for this it was necessary through lengthy and costly experiments to determine the most favorable gap shape of the nozzle. aside from that A special nozzle knife was required for each bandwidth. Of course it was an afterthought Changing the nozzle gap is no longer possible. this ^ was particularly disadvantageous when changes were made to the Operating conditions a subsequent correction of the Made Düeenspalta appear desirable.

The invention is based on the object of creating a nozzle knife, .which for all bandwidths or at least at least suitable for a wide range of bandwidths is * This object is achieved according to the invention by that the air flow from a room with uniform Air pressure through a gap, the width of which in sections is changeable, blown onto the coated material will. Now it is no longer necessary to develop a special nozzle for *, every bandwidth, it according to the invention, the DQeengp & lt is simply on ^ ede Bandwidth regulated or shaped accordingly, with the same output air over the entire bandwidth Pressure is available. '

There is an expedient constructive embodiment in that at least one of the nozzle gap of both

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on the side delimiting walls is resiliently elastic and that means for spreading apart or contracting the walls are provided between the wallsf whereby at least one of the walls delimiting the nozzle gap on both sides is pivotably supported on its outside along a line parallel to the nozzle gap on an abutment fixed to the housing and that the Spreading devices; or * contraction of the walls staggered sur pivotable support are arranged * The nozzle is thus in principle is not DAFL two mutually groove ⁴ over the entire length but also within each nozzle section in the manner of a Waagebaikens verßchwenkbarre elastic walls are provided, so that the Austritte- Opening of the nozzle by acting on the adjusting elements practically any desired hair dryer

The further structure of the nozzle with regard to the air supply is such that the nozzle is arranged on a collector, the two to each other and to the air supply line DUsenspalt parallel, opposed to each other Has perforated tubes guided into the collector at the sides, which the swivel support for the inside of the collector form perforated nozzle walls, where <1 collector consists of elastic material and at the same time form the holder for the elastic perforated nozzle walls and the collector is provided with lips is gas-tight with the nozzle-side ends of the DUsenwand are connected. The nozzles thus form with the Air supply one unit. Feeding the li-ft of opposite sides make a good ^

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Pressure equalization and thus always sufficiently equal Pressure in the collector. The formation of the adjusting elements of the nozzle is carried out in such a way that the devices for Spreading apart or contracting the nozzle walls at the opposite lips, outwards over the collector protruding ends are arranged, wherein a movable seal is arranged between the elastic perforated nozzle walls, which the between the space formed by the walls on the side opposite the nozzle opening and closes the facilities For spreading apart and contracting the nozzle walls, adjusting screws with opposing threads that engage in threaded holes in the nozzle walls. · "" -

To achieve any desired shape of the nozzle gap so only the adjusting screws need to be adjusted accordingly.

The drawing shows an embodiment of the invention. It means:

Pig..1 a cross section through the registration

object,.

Fig. 2 is a side view, Fig. J> one of the various forms of the nozzle

outlet opening or the nozzle gap Fig. 4 one. Section through the adjustment head

with the air supply.

In Figure 1 are provided for rii-e air supply Pipes with 1 or. La denotes, which the perforation 2

BATH

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have and are mounted within the two SaamltrhKlften 3a, 3b, which consist of an elastic material. The two Saaraler halves 3a, 3b are closed at both ends by nozzle walls 4 and 5, which are supported on the tubes 1 a, 1 b, and have the openings 6 and 7, respectively. The space 5b is located between the two nozzle walls 4 and 5, respectively. At their upper ends, the nozzle walls 6 and 7 carry the lips 8 and 9 *, respectively, between which the actual nozzle gap Sa. with the sections c, d, e, f , g, h, i is located. At the ends facing away from the lips 8 and 9, adjusting screws IO with opposing threads with nuts 10a and 10b are arranged between the nozzle walls. A movable seal 11 is arranged between the DOsenwMnden 4 and 5. The header halves 3 a and 3 b are closed at their end faces by bottoms 11 of the header boxes 12, into which the pipes 1 a, 1 b and the air supply pipes 13 open, which are rotatably mounted in the bearing 14. In each case one of the pipes la, Ib opening into the collecting tank 12 is closed, that is to say blind, the other one is open, so that only one pipe la or Ib is exposed to air from each collecting tank. The air supply pipe 13 is rotatably mounted in the bearing 14. The air feed into both air supply pipes 13 is expediently carried out, but this is not the subject of the invention, via rotatable seals (not shown) and a Y-pipe from the main air line, which results in a uniform supply of air.

Effective catfish t ' , ._ ,. ".. _..., .-

The air flows through the air supply pipes on both sides

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Into the two collecting boxes 12, through the respective open tube i & b & Wo Ib via the perforation 2 into the collecting half . Yes. or Jb. From there. it flows through the opening 6 or o, 7 into the space 5b and is then blown through the nozzle gap 9a towards the galvanizing strip. By precisely setting the adjusting screws 1-0, the nozzle gap S & can now be adjusted over the entire width of the nozzle, specifically in sections with different gap section widths c _s d, e, f _s g _a h, i. This is done daduröh _s that when adjusting the left and with reehtsgewind® "adjusting screws 10 provided the nut 10a or" 10b, for example, a-üse-inandes * | © g-presses are * -wodurch also "Üie" with ihneil connected -DSsenwänd® · £ or ' 5 · pushed apart i-9®ru & n _o Since the nozzle walls k and 5 are supported like a horizontal beam on the pipes 1a or 1b, the lips 8 and 5 located on the opposite sides of the nozzle walls -. »9 approached each other j the nozzle gap at" this St®11® thus reduced. When the Ve ¹ adjusting screws IQ- in the nozzle edges "4 or approached each other, whereby the lips δ or 9 located at the opposite end are removed from one another due to the horizontal bar-like behavior of the nozzle walls 4 and 5 can be adjusted both to the left and to the right and the nozzle walls 4 and 5 © are elastic, the lips 8 and 9 can also be adjusted in sections as desired can thus spring the DUsenspalt

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adapt to any requirement, even .during operation, so that costly and time-consuming experiments are not necessary. By means of the bearing 14 and the rotatable seals (not shown) , the angle of incidence of the nozzle jet on the strip can be adjusted as desired.

The invention not only relates to the illustrated embodiment, but also includes all constructions that work on the same principle.

ZÜiöi4 / Uit ι

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Claims (9)

- Be / Ka -8 - yy. March 1971. Claims Process for regulating the knife-shaped air atronis emerging from a nozzle, serving to act on coated strips in strip viewing systems, e.g. strip fire galvanizing systems,
characterized,
that the air stream from a space having uniform air pressure dureh a gap (9) * whose width in sections (c - i) is variable, on ^dae: coated material is blown. 2. Device for performing the method according to. Claim I ^ consisting of a transverse to the moving belt; arranged nozzle with gap-shaped, against the coated strip of directed outlet opening (9a), characterized, . that at least one of the nozzle gap (9a) on both sides delimiting walls (4,5) is resiliently elastic and that between the walls Means (10) are provided for spreading apart or contracting the walls. 3 device according to claim 2,
characterized,
that at least one of the DUsenspalt (9a) 209844/0418 "SAD ORLGiNAL - Be / Ka - 9 - March 3, 19 ?! both sides delimiting walls (4,5-) on their Outside along one to the DUsenspalt (9a) parallel line on a housing-fixed abutment (la, Ib) is pivotably supported and that the devices (10) for spreading apart or contraction of the walls (4,5) arranged offset to the pivotable support are. ■ 4. Device according to claims 2 and 3 *. characterized, that the nozzle is arranged on a collector (JJa, 3b) is, as the air supply line, two mutually and opposite sides parallel to each other and to the DUsenspalt. in the collector (3a, 3b) has guided perforated tubes (la, Ib), which the SohwenfcabstÜtzung for the inside of the collector perforated nozzle walls {4,5) form. 5. - Device according to claims 2 to 4, characterized, that the collector (3a, 3b) is made of elastic material and at the same time the. Bracket for dif ' form elmstischen perforated iron walls (4,5) « 6. Device according to claims 2 to 5>, _H: dajaürch characterized, ■ r ι d »0 dep SaamXer (3a, 3b) is stranded with lips (8 * 9) which are gas-tightly connected to the nozzle-side ends of the nozzle walls (4,5). 20-9-8 A4 / 04 18 - BeAa ^ -10- 3rd MSrz 1971. 7. Device according to claims 2 to 6, characterized by. . . that the devices (10) for spreading or pulling the outer walls (4,5) together are arranged in the ends opposite the lips (8,9) and protruding outwardly beyond the collector (3 & 1b ⁾ . 8th. --. Device according to claims 2bis "J ₃ characterized, · that between the elastic perforated nozzle walls ■ (■% '; 5) a movable seal (11) is arranged, which between the WMnden (4,5) '. formed space to that of the DÜaenöffnuBg (9a). ■■ · .. 'opposite side is closed. 9. Device according to claims 2 to 8, characterized, that the devices for spreading apart and contracting the nozzle walls {4,5) are adjustable ■ very precise & n- (XO) with opposing threads i% C tapped holes in the nozzle walls (4 * 5) 209844/0418 A4 Le e rs e lie