EP0542765A1 - Device for blowing off excess coating material when coating metal strip. - Google Patents

Device for blowing off excess coating material when coating metal strip.

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Publication number
EP0542765A1
EP0542765A1 EP91912846A EP91912846A EP0542765A1 EP 0542765 A1 EP0542765 A1 EP 0542765A1 EP 91912846 A EP91912846 A EP 91912846A EP 91912846 A EP91912846 A EP 91912846A EP 0542765 A1 EP0542765 A1 EP 0542765A1
Authority
EP
European Patent Office
Prior art keywords
nozzle
blow
gap
strip
compressed air
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP91912846A
Other languages
German (de)
French (fr)
Other versions
EP0542765B1 (en
Inventor
Heinrich Pannenbecker
Ronald Jabs
Heinrich Schmitz
Wulf Dechene
Manfred Splitt
Hans-Joachim Heiler
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Thyssen Stahl AG
Original Assignee
Thyssen Stahl AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Thyssen Stahl AG filed Critical Thyssen Stahl AG
Priority to AT9191912846T priority Critical patent/ATE105339T1/en
Publication of EP0542765A1 publication Critical patent/EP0542765A1/en
Application granted granted Critical
Publication of EP0542765B1 publication Critical patent/EP0542765B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/14—Removing excess of molten coatings; Controlling or regulating the coating thickness
    • C23C2/16—Removing excess of molten coatings; Controlling or regulating the coating thickness using fluids under pressure, e.g. air knives
    • C23C2/18—Removing excess of molten coatings from elongated material
    • C23C2/20—Strips; Plates

Definitions

  • the invention relates to a device for blowing off superfluous coating material, in particular liquid zinc or aluminum, in the coating of metal strips with a blow-off nozzle which can be acted upon by a blow-off medium, the nozzle body of which is attached to a base body and the mutually adjustable nozzle lips of which extend in the transverse direction of the metal strip Form nozzle gap 10.
  • Such a blow-off device is known from DE-OS 361 805.
  • Such a known blow-off nozzle is used to blow off the excess coating agent, in particular zinc or aluminum, along the entire width of the metal strip when coating metal strips. This results in a uniform application of the coating agent over the entire range.
  • the blow-off nozzle has a nozzle gap along the width, which can be adjusted to the required blow-off conditions by adjusting the nozzle lips against each other.
  • the pressure of the blow-off medium can be adjusted in the known device in order to create blow-off conditions that are as optimal as possible.
  • the invention is therefore based on the object of improving a device of the type mentioned at the outset in such a way that a blow-off process which takes account of the unevenness of the strip to be coated is made possible.
  • blow-off nozzle is designed as a nozzle row, with at least two partial nozzles which can be acted upon and sealed against one another with a blow-off medium, in particular compressed air, being provided in the transverse direction of the strip and adjoining the respective partial gap to form a continuous nozzle gap.
  • the invention is characterized in that the blow-off nozzle is designed as a nozzle line with individual partial nozzles, each of the partial nozzles being able to be acted upon with different pressure, in order to be able to optimally adjust the pressure profile along the width of the strip to be coated.
  • This allows the variety of processing options to be significantly increased. It is also conceivable, for example, to spray two or more different belts at the same time with one nozzle row, it being possible to achieve different coating conditions for the individual partial belts.
  • the solution according to the invention is characterized in that the blow-off medium available is used more economically, since a corresponding reduction can be carried out in those places where less blow-off medium is required and only those partial nozzles have to be subjected to a correspondingly higher charge. w this is necessary.
  • variable adaptation to the respective bandwidth can take place.
  • each partial nozzle consists of a first nozzle half and a second nozzle half, the first nozzle half having a channel for the supply of the blow-off medium to the nozzle gap and the second nozzle half being so massive that it is in the transverse direction of the strip by interchanging the first and second nozzle halves in an alternating arrangement of the partial nozzles, the respective second nozzle half sealingly adjoins the adjacent first nozzle halves.
  • the partial nozzles arranged in the edge region can also be pressurized separately from the others.
  • a further pair of nozzle lips with a further adjustable continuous nozzle gap is provided along the nozzle line. This ensures that the metal strip to be blown is exposed to a slot nozzle with an exactly linear gap, but the pressure conditions can be variably adjusted along the bandwidth. This enables the blow-off conditions to be further improved.
  • a conversion of the pressure conditions formed by the first or second half of the nozzle without any significant pressure loss into the further nozzle gap formed by the further pair of nozzle lips results if a seal is provided by means of which the further pair of nozzle lips is sealed off from the partial nozzles.
  • FIG. 1 shows a perspective view of a blow-off device according to the invention
  • FIG. 2 shows a section along the line I-I in FIG. 1,
  • FIG. 4 shows a section along the line B-B in FIG.
  • the blow-off device essentially consists of a nozzle body, which is shown in the right part of FIG. 2 and which is fastened to a base body 1 by means of a fastening screw 9.
  • a Drucklu tanschluß 12 is provided, which is connected to a compressed air channel 16 and can be acted upon externally with compressed air.
  • the compressed air channel 16 extends from the compressed air connection 12 to a nozzle gap opening 1
  • the compressed air duct 16 is enclosed by a first nozzle half 3 and a second nozzle half 4, which are connected to one another by means of clamping screws 5 In the area of the nozzle gap 10, the compressed air channel 16 extends exclusively within the first nozzle half, while the second nozzle half 4 is solid in this area.
  • the second nozzle half 4 has a shoulder 4a in its solid area, on which a set screw 6 is supported, which lies in a thread in the first nozzle half 3.
  • the width of the nozzle gap opening 10 can be adjusted by rotating the adjusting screw 6.
  • the regions of the first nozzle half 3 and the second nozzle half 4 arranged in the region of the nozzle gap opening 10 interact in the manner of a pair of nozzle lips.
  • a further pair of nozzle lips 11 is arranged, which is sealed against the first and second nozzle halves 3 and 4 by means of a seal 15 and is fastened in the solid region of the second nozzle half 4 by means of an adjusting screw 14.
  • the further pair of nozzle lips 11 forms at its tip a further nozzle gap 13, which is also adjustable by adjusting the adjusting screw 14.
  • the arrangement of the partial nozzles shown in FIG. 2 is repeated along the width of the metal strip to be coated, which extends in the direction of the nozzle gap 10 or the further nozzle gap 13.
  • the partial nozzles shown in FIG. 2 are each different alternately offset from one another in such a way that a first nozzle half always adjoins the second nozzle half of the adjacent partial nozzle along the nozzle gap opening.
  • Sealing plates 7 for sealing the two outer partial nozzles against the ambient pressure are located in the edge region of the nozzle row designed in this way.
  • the formation of the solid area of the respective second nozzle halves 4 ensures that further sealing means are not required between the partial nozzles arranged in the central area.
  • the solid areas of the second nozzle halves seal the adjacent first nozzle halves with the channel for the pressure medium so that each of the partial nozzles 2 can be pressurized separately at the compressed air connection 12 with a pressure medium without the pressure conditions in the respectively neighboring partial nozzles thereby changing .
  • the gap 10 shown in FIG. 3 is formed in the manner of a rectangular function, the individual rectangular sections being offset by the width of the nozzle gap 10.
  • the blow-off device By designing the blow-off device as a nozzle row with a continuous nozzle gap, the nozzle gap can be set separately in each blow-off section and the pressure of the blow-off medium can be regulated separately. For example, it is possible to work with the same or different blow-off pressure over the entire blow-off area, depending on the conditions of the coating agent.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Coating Apparatus (AREA)
  • Coating With Molten Metal (AREA)
  • Nozzles (AREA)

Abstract

Un dispositif permet d'éliminer par air soufflé l'excédent en matériau de revêtement, notamment du zinc ou de l'aluminium liquides, lors du revêtement de bandes métalliques. Le dispositif comprend une tuyère alimentée par de l'air comprimé dont le corps (3, 4) est assujetti à un corps de base (1). Les lèvres (3, 4) mutuellement ajustables de la tuyère forment une fente (10) transversale par rapport à la bande métallique. Afin d'obtenir une adaptation optimale de la largeur de la fente ou de la pression du milieu soufflé sur toute la largeur de la bande, la tuyère est formée d'une rangée de tuyères. Au moins deux tuyères partielles (2) mutuellement isolées et séparément alimentées par un milieu soufflé, notamment de l'air comprimé, sont agencées transversalement par rapport à la bande, leurs fentes partielles étant adjacentes de manière à former une fente continue (10).A device makes it possible to remove by blown air the excess of coating material, in particular liquid zinc or aluminum, during the coating of metal strips. The device comprises a nozzle supplied with compressed air, the body (3, 4) of which is secured to a base body (1). The mutually adjustable lips (3, 4) of the nozzle form a slot (10) transverse to the metal strip. In order to obtain an optimum adaptation of the width of the slot or of the pressure of the blown medium over the entire width of the strip, the nozzle is formed by a row of nozzles. At least two partial nozzles (2) mutually insulated and separately supplied with a blown medium, in particular compressed air, are arranged transversely with respect to the strip, their partial slots being adjacent so as to form a continuous slot (10).

Description

Vorrichtung zum Abblasen von Beschichtungsmaterial bei der Beschichtung von MetallbändernDevice for blowing off coating material when coating metal strips
Die Erfindung betrifft eine Vorrichtung zum Abblasen von überflüssigem Beschichtungsmaterial, insbesondere von flüssigem Zink oder Aluminium, bei der Beschichtung von Metallbändern mit einer durch ein Abblasmedium beaufschlagbaren Abblasdüse, deren Düsenkörper an einem Grundkörper befestigt ist und deren gegeneinander verstellbare Düsenlippen einen sich in Querrichtung des Metallbandes erstreckenden Düsenspalt 10 ausbilden.The invention relates to a device for blowing off superfluous coating material, in particular liquid zinc or aluminum, in the coating of metal strips with a blow-off nozzle which can be acted upon by a blow-off medium, the nozzle body of which is attached to a base body and the mutually adjustable nozzle lips of which extend in the transverse direction of the metal strip Form nozzle gap 10.
Eine solche Abblasvorrichtung ist aus der DE-OS 361 805 bekannt. Mittels einer solchen bekannten Abblasdüse wird beim Beschichten von Metallbändern das überschüssige Beschichtungsmittel, insbesondere Zink oder Aluminium, entlang der gesamten Breite des Metallbandes abgeblasen. Hierdurch ergibt sich eine gleichmäßige Auftragung des Beschichtungsmittels über die gesamte Bandbreite. Bei einer solchen bekannten Abblasvorrichtung weist die Abblasdüse entlang der Bandbreite einen Düsenspalt auf, welcher durch die Verstellung der Düsenlippen gegeneinander an die geforderten Abblasbedingungen abgepaßt werden kann. Darüber hinaus ist bei der bekannten Vorrichtung der Druck des Abblasmediums einstellbar, um auch hierüber möglichst optimale Abblasbedingungen zu schaffen.Such a blow-off device is known from DE-OS 361 805. Such a known blow-off nozzle is used to blow off the excess coating agent, in particular zinc or aluminum, along the entire width of the metal strip when coating metal strips. This results in a uniform application of the coating agent over the entire range. In such a known blow-off device, the blow-off nozzle has a nozzle gap along the width, which can be adjusted to the required blow-off conditions by adjusting the nozzle lips against each other. In addition, the pressure of the blow-off medium can be adjusted in the known device in order to create blow-off conditions that are as optimal as possible.
Im praktischen Einsatz der bekannten Vorrichtung hat sich gezeigt, daß auf Grund der Bandwölbung oder Unebenheiten de Beschichtungsmaterials, ein gleichmäßiger Abblasvorgang nicht hinreichend möglich ist, da bei der bekannten Vorrichtung über die gesamte Breite des Düsenspaltes stet der gleiche Druck herrscht.In practical use of the known device it has been shown that due to the band curvature or unevenness of the coating material, a uniform blowing process is not sufficiently possible since the known one Device over the entire width of the nozzle gap is constantly the same pressure.
Daher liegt der Erfindung die Aufgabe zugrunde, eine Vorrichtung der eingangs genannten Art dahingehend zu verbessern, daß ein die Unebenheiten des zu beschichtende Bandes berücksichtigender Abblasvorgang ermöglicht wird.The invention is therefore based on the object of improving a device of the type mentioned at the outset in such a way that a blow-off process which takes account of the unevenness of the strip to be coated is made possible.
Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß di Abblasdüse als Düsenzeile ausgebildet ist, wobei in Bandquerrichtung mindestens zwei, getrennt mit einem Abblasmedium, insbesondere Druckluft, beaufschlagbare gegeneinander abgedichtete Teildüsen vorgesehen sind, der jeweilige Teilspalte unter Ausbildung eines durchgehenden Düsenspaltes aneinander angrenzen.This object is achieved in that the blow-off nozzle is designed as a nozzle row, with at least two partial nozzles which can be acted upon and sealed against one another with a blow-off medium, in particular compressed air, being provided in the transverse direction of the strip and adjoining the respective partial gap to form a continuous nozzle gap.
Die Erfindung zeichnet sich dadurch aus, daß die Abblasdü als eine Düsenzeile mit einzelnen Teildüsen ausgebildet wird, wobei jede der Teildüsen mit unterschiedlichem Druc beaufschlagt werden kann, um somit das Druckprofil entlan der Breite des zu beschichtenden Bandes optimiert einstel zu können. Hierdurch läßt sich die Vielfalt der Bearbeitungsmöglichkeiten deutlich erhöhen. Es ist beispielsweise auch denkbar, mit einer Düsenzeile zwei ode mehr verschiedene Bänder gleichzeitig zu bedüsen, wobei unterschiedliche Beschichtungsauflagen für die einzelnen Teilbänder erzielt werden können. Darüber hinaus zeichnet sich die erfindungsgemäße Lösung dadurch aus, daß ein sparsamerer Umgang mit dem zur Verfügung stehenden Abblasmedium erreicht wird, da an solchen Stellen, wo weniger Abblasmedium benötigt wird, eine entsprechende Reduzierung vorgenommen werden kann und nur diejenigen Teildüsen entsprechend höher beaufschlagt werden müssen, w dies erforderlich ist. Durch gezielte Abschaltung der einzelnen Teildüsen kann eine variable Anpassung an die jeweilige Bandbreite erfolgen. Eine bevorzugte Ausführungsform der Erfindung ist darin zu sehen, daß jede Teildüse aus einer ersten Düsenhälfte und einer zweiten Düsenhälfte besteht, wobei die erste Düsenhälfte einen Kanal für die Zuleitung des Abblasmediums zum Düsenspalt aufweist und die zweite Düsenhälfte derart massiv ist, daß bei sich in Bandquerrichtung durch Vertauschen von erster und zweiter Düsenhälfte abwechselnder Anordnung der Teildüsen die jeweilige zweite Düsenhälfte dichtend an die benachbarten ersten Düsenhälften angrenzt.The invention is characterized in that the blow-off nozzle is designed as a nozzle line with individual partial nozzles, each of the partial nozzles being able to be acted upon with different pressure, in order to be able to optimally adjust the pressure profile along the width of the strip to be coated. This allows the variety of processing options to be significantly increased. It is also conceivable, for example, to spray two or more different belts at the same time with one nozzle row, it being possible to achieve different coating conditions for the individual partial belts. In addition, the solution according to the invention is characterized in that the blow-off medium available is used more economically, since a corresponding reduction can be carried out in those places where less blow-off medium is required and only those partial nozzles have to be subjected to a correspondingly higher charge. w this is necessary. By specifically switching off the individual sub-nozzles, variable adaptation to the respective bandwidth can take place. A preferred embodiment of the invention can be seen in the fact that each partial nozzle consists of a first nozzle half and a second nozzle half, the first nozzle half having a channel for the supply of the blow-off medium to the nozzle gap and the second nozzle half being so massive that it is in the transverse direction of the strip by interchanging the first and second nozzle halves in an alternating arrangement of the partial nozzles, the respective second nozzle half sealingly adjoins the adjacent first nozzle halves.
Bei dieser Ausführungsform ergibt sich ein besonders einfacher geometrischer Aufbau, da für die gesamte Düsenzeile von denselben konstruktiven Grundeinheiten ausgegangen werden kann und diese nur entsprechend abwechselnd aneinander gereiht werden müssen. Der besondere Vorteil ist dabei darin zu sehen, daß durch die massive Ausbildung der zweiten Düsenhälfte diese gleichzeitig als Abdichtung gegen die benachbarten ersten Düsenhälften wirkt. Deswegen kann auf zusätzliche Abdichtelemente verzichtet werden.This embodiment results in a particularly simple geometric structure, since the same basic structural units can be assumed for the entire nozzle row and these only have to be lined up alternately accordingly. The particular advantage is to be seen in the fact that the massive design of the second nozzle half also acts as a seal against the adjacent first nozzle halves. Therefore, additional sealing elements can be dispensed with.
Dadurch, daß an beiden Randbereichen der Düsenzeile Abdichtplatten vorgesehen sind, können auch die im Randbereich angeordneten Teildüsen separat von den anderen mit Druckluft beaufschlagt werden.Due to the fact that sealing plates are provided on both edge regions of the nozzle row, the partial nozzles arranged in the edge region can also be pressurized separately from the others.
Darüber hinaus ist bei einer weiteren Ausgestaltung der Erfindung vorgesehen, daß entlang der Düsenzeile ein weiteres Düsenlippenpaar mit einem weiteren verstellbaren durchgehenden Düsenspalt vorgesehen ist. Hierdurch ist gewährleistet, daß das zu beblasende Metallband einer Schlitzdüse mit exakt linienförmigem Spalt ausgesetzt ist, wobei jedoch entlang der Bandbreite die Druckbedingungen variabel einstellbar sind. Dies ermöglicht eine weitere Verbesserung der Abblasbedingungen. Eine Umsetzung der durch die erste bzw. zweite Düsenhälft gebildeten Druckbedingungen ohne nennenswerten Druckverlu in den durch das weitere Düsenlippenpaar gebildeten weiteren Düsenεpalt ergibt sich, wenn eine Dichtung vorgesehen ist, mittels der das weitere Düsenlippenpaar gegenüber den Teildüsen abgedichtet ist.In addition, it is provided in a further embodiment of the invention that a further pair of nozzle lips with a further adjustable continuous nozzle gap is provided along the nozzle line. This ensures that the metal strip to be blown is exposed to a slot nozzle with an exactly linear gap, but the pressure conditions can be variably adjusted along the bandwidth. This enables the blow-off conditions to be further improved. A conversion of the pressure conditions formed by the first or second half of the nozzle without any significant pressure loss into the further nozzle gap formed by the further pair of nozzle lips results if a seal is provided by means of which the further pair of nozzle lips is sealed off from the partial nozzles.
Die Erfindung wird im folgenden an Hand eines Ausführungsbeispieles näher erläutert.The invention is explained in more detail below using an exemplary embodiment.
Dabei zeigenShow
Figur 1 eine perspektivische Ansicht einer erfindungsgemäßen Abblasvorrichtung,FIG. 1 shows a perspective view of a blow-off device according to the invention,
Figur 2 einen Schnitt entlang der Linie I-I in Figur 1,FIG. 2 shows a section along the line I-I in FIG. 1,
Figur 3 einen Schnitt entlang der Linie A-A in Figur 2 un3 shows a section along the line A-A in Figure 2 un
Figur 4 einen Schnitt entlang der Linie B-B in Figur 2.4 shows a section along the line B-B in FIG.
Die erfindungsgemäße Abblasvorrichtung besteht im wesentlichen aus einem Düsenkörper, welcher im rechten Te von Figur 2 dargestellt ist und welcher mittels einer Befestigungsschraube 9 an einem Grundkörper 1 befestigt ist. Unterhalb der Befestigungsschraube 9 im Grundkörper ist ein Drucklu tanschluß 12 vorgesehen, welcher mit eine Druckluftkanal 16 in Verbindung steht und extern mit Druckluft beaufschlagt werden kann.The blow-off device according to the invention essentially consists of a nozzle body, which is shown in the right part of FIG. 2 and which is fastened to a base body 1 by means of a fastening screw 9. Below the mounting screw 9 in the base body, a Drucklu tanschluß 12 is provided, which is connected to a compressed air channel 16 and can be acted upon externally with compressed air.
Der Druckluftkanal 16 erstreckt sich von dem Druckluftanschluß 12 bis hin zu einer Düsenspaltöffnung 1The compressed air channel 16 extends from the compressed air connection 12 to a nozzle gap opening 1
Der Druckluftkanal 16 wird dabei umschlossen von einer ersten Düsenhälfte 3 und einer zweiten Düsenhälfte 4, welche mittels Spannschrauben 5 miteinander verbunden sin Im Bereich des Düsenspaltes 10 erstreckt sich der Druckluftkanal 16 ausschließlich innerhalb der ersten Düsenhälfte, während die zweite Düsenhälfte 4 in diesem Bereich massiv ausgebildet ist.The compressed air duct 16 is enclosed by a first nozzle half 3 and a second nozzle half 4, which are connected to one another by means of clamping screws 5 In the area of the nozzle gap 10, the compressed air channel 16 extends exclusively within the first nozzle half, while the second nozzle half 4 is solid in this area.
Dabei weist die zweite Düsenhälfte 4 in ihrem massiven Bereich eine Schulter 4a auf, auf der sich eine Stellschraube 6 abstützt, welche in einem Gewinde in der ersten Düsenhälfte 3 einliegt. Durch die Drehung der Stellschraube 6 läßt sich die Breite der Düsenspaltöffnung 10 einstellen.Here, the second nozzle half 4 has a shoulder 4a in its solid area, on which a set screw 6 is supported, which lies in a thread in the first nozzle half 3. The width of the nozzle gap opening 10 can be adjusted by rotating the adjusting screw 6.
Die im Bereich der Düsenspaltöffnung 10 angeordneten Bereiche der ersten Düsenhälfte 3 und der zweite Düsenhälft 4 wirken dabei in der Art eines Düsenlippenpaares zusammen.The regions of the first nozzle half 3 and the second nozzle half 4 arranged in the region of the nozzle gap opening 10 interact in the manner of a pair of nozzle lips.
Im Bereich außerhalb der Düsenspaltöffnung 10 ist ein weiteres Düsenlippenpaar 11 angeordnet, welches gegen die erste bzw. zweite Düsenhälfte 3 bzw. 4 mittels einer Dichtung 15 abgedichtet ist und mittels einer Stellschraube 14 im massiven Bereich der zweiten Düsenhälfte 4 befestigt ist. Das weitere Düsenlippenpaar 11 bildet an seiner Spitze einen weiteren Düsenspalt 13 aus, welcher durch Einstellung der Stellschraube 14 ebenfalls verstellbar ist.In the area outside the nozzle gap opening 10, a further pair of nozzle lips 11 is arranged, which is sealed against the first and second nozzle halves 3 and 4 by means of a seal 15 and is fastened in the solid region of the second nozzle half 4 by means of an adjusting screw 14. The further pair of nozzle lips 11 forms at its tip a further nozzle gap 13, which is also adjustable by adjusting the adjusting screw 14.
Wie aus Figur 1 hervorgeht, wiederholt sich entlang der Breite des zu beschichtenden Metallbandes, welche sich in Richtung des Düsenspaltes 10 bzw. des weiteren Düsenspaltes 13 erstreckt, die Anordnung der in Figur 2 dargestellten Teildüsen 2. Die in Figur 2 dargestellten Teildüsen sind jedoch jeweils abwechselnd so zueinander versetzt, daß entlang der Düsenspaltöffnung stets eine erste Düsenhälfte an die zweite Düsenhälfte der benachbarten Teildüse angrenzen. Im Randbereich der so ausgebildeten Düsenzeile befinden sich Abdichtplatten 7 zur Abdichtung der beiden äußeren Teildüsen gegen den Umgebungsdruck. Durch die Ausbildung des massiven Bereichs der jeweiligen zweiten Düsenhälften 4 ist gewährleistet, daß zwischen de im Mittelbereich angeordneten Teildüsen weitere Abdichtmittel nicht erforderlich sind. Vielmehr dichten die massiven Bereiche der zweiten Düsenhälften die ihnen benachbarten ersten Düsenhälften mit dem Kanal für das Druckmedium so ab, daß jede der Teildüsen 2 getrennt am Druckluftanschluß 12 mit einem Druckmedium beaufschlagt werden kann, ohne daß sich die Druckverhältnisse in den jeweils benachbarten Teildüsen dadurch ändern.As can be seen from FIG. 1, the arrangement of the partial nozzles shown in FIG. 2 is repeated along the width of the metal strip to be coated, which extends in the direction of the nozzle gap 10 or the further nozzle gap 13. However, the partial nozzles shown in FIG. 2 are each different alternately offset from one another in such a way that a first nozzle half always adjoins the second nozzle half of the adjacent partial nozzle along the nozzle gap opening. Sealing plates 7 for sealing the two outer partial nozzles against the ambient pressure are located in the edge region of the nozzle row designed in this way. The formation of the solid area of the respective second nozzle halves 4 ensures that further sealing means are not required between the partial nozzles arranged in the central area. Rather, the solid areas of the second nozzle halves seal the adjacent first nozzle halves with the channel for the pressure medium so that each of the partial nozzles 2 can be pressurized separately at the compressed air connection 12 with a pressure medium without the pressure conditions in the respectively neighboring partial nozzles thereby changing .
Bei der zellenförmigen Anordnung der einzelnen Teildüsen entsteht der in Figur 3 dargestellte in der Art einer Rechteckfunktion ausgebildete Spalt 10, wobei die einzeln Rechteckabschnitte um die Breite des Düsenspaltes 10 versetzt sind.In the case of the cellular arrangement of the individual partial nozzles, the gap 10 shown in FIG. 3 is formed in the manner of a rectangular function, the individual rectangular sections being offset by the width of the nozzle gap 10.
Demgegenüber ist der an der Spitze des weiteren Dichtlippenpaares 11 ausgebildete Druckluftspalt 13» wie in Figur 4 dargestelt ist, linear.In contrast, the compressed air gap 13 formed at the tip of the further pair of sealing lips 11 is linear, as shown in FIG. 4.
Durch die Ausgestaltung der Abblasvorrichtung als Düsenzeile mit durchgehendem Düsenspalt läßt sich in jede Abblasabschnitt der Düsenspalt separat einstellen und der Druck des Abblasmediums getrennt regeln. Es ist so zum Beispiel möglich, über den gesamten Abblasbereich mit gleichem oder unterschiedlichem Abblasdruck entsprechend den Gegebenheiten des Beschichtungsmittels zu arbeiten.By designing the blow-off device as a nozzle row with a continuous nozzle gap, the nozzle gap can be set separately in each blow-off section and the pressure of the blow-off medium can be regulated separately. For example, it is possible to work with the same or different blow-off pressure over the entire blow-off area, depending on the conditions of the coating agent.
Alternativ ist es auch möglich, bei nebeneinanderliegende schmaleren Bändern mittels einer einzigen Abblasvorrichtu mehrere Bänder gleichzeitig zu bearbeiten, wobei die Abblasdrücke entsprechend unterschiedlich angepaßt eingestellt sind. Somit lassen sich verschiedene Beschichtungsauflagen gleichzeitig produzieren. Alternatively, it is also possible to process a plurality of belts at the same time in the case of narrower belts lying next to one another by means of a single blow-off device, the blow-off pressures being adjusted accordingly differently. This means that different coating runs can be produced at the same time.

Claims

A N S P R Ü C H E EXPECTATIONS
1. Vorrichtung zum Abblasen von überflüssigem Beschichtungsmaterial, insbesondere von flüssigem Zink oder Aluminium, bei der Beschichtung von Metallbändern mit einer durch ein Abblasmedium beaufschlagbaren Abblasdüse, deren Düsenkörper (3>O an einem Grundkörper (1) befestigt ist und deren gegeneinander verstellbare Düsenlippen einen sich in Querrichtung des Metallbandes erstreckenden Düsenspalt (10) ausbilden d a d u r c h g e k e n n z e i c h n e t , daß die Abblasdüse als Düsenzeile ausgebildet ist, wobei in Bandquerrichtung mindestens zwei, getrennt mit einem Abblasmedium, insbesondere Druckluft, beaufschlagbare gegeneinander abgedichtete Teildüsen (2) vorgesehen sind, deren jeweilige Teilspalte (10) unter Ausbildung eines durchgehenden Düsenspaltes aneinander angrenzen.1. Device for blowing off superfluous coating material, in particular liquid zinc or aluminum, in the coating of metal strips with a blow-off nozzle which can be acted upon by a blow-off medium, the nozzle body (3 > O of which is attached to a base body (1) and the nozzle lips of which can be adjusted relative to one another Form nozzle gap (10) extending in the transverse direction of the metal strip, characterized in that the blow-off nozzle is designed as a nozzle row, at least two part nozzles (2), which can be acted upon and sealed against one another and provided with a blow-off medium, in particular compressed air, are provided in the strip transverse direction, the respective partial gaps (10) of which Adjacent to each other to form a continuous nozzle gap.
2. Vorrichtung nach Anspruch 1, d a d u r c h g e k e n n z e i c h n e t , daß jede Teildüse (2) aus einer ersten Düsenhälfte (3) und einer zweiten Düsenhälfte (4) besteht, wobei die erste Düsenhälft2. Apparatus according to claim 1, so that each sub-nozzle (2) consists of a first nozzle half (3) and a second nozzle half (4), the first nozzle half
(3) einen Kanal für die Zuleitung der Druckluft zum Düsenspalt (10) aufweist und die zweite Düsenhälfte (4) derart massiv ist, daß bei sich in Bandquerrichtung durch Vertauschen von erster und zweiter Düsenhälfte abwechselnde Anordnung der Teildüsen (2) die jeweilige zweite Düsenhälft(3) has a channel for the supply of compressed air to the nozzle gap (10) and the second half of the nozzle (4) is so massive that when the partial nozzles (2) alternate in the transverse direction of the strip by swapping the first and second half of the nozzle, the respective second half of the nozzle
(4) dichtend an die benachbarten ersten Düsenhälften (3) angrenzt. (4) sealingly adjacent to the adjacent first nozzle halves (3).
3. Vorrichtung nach Anspruch 1 oder 2, d a d u r c h g e k e n n z e i c h n e t , daß an den Randbereichen der Düsenzeile Abdichtplatten (7) vorgesehe sind.3. Device according to claim 1 or 2, d a d u r c h g e k e n n z e i c h n e t that sealing plates (7) are provided at the edge regions of the nozzle line.
4. Vorrichtung nach einem der Ansprüche 1 bis 3, d a d u r c h g e k e n n z e i c h n e t , daß entlang der Düsenzeile parallel zum Düsenspalt (10) ein weiteres Düsenlippenpaar (11) mit einem weiteren verstellbaren durchgehenden Düsenspalt (13) vorgesehen ist.4. Device according to one of claims 1 to 3, d a d u r c h g e k e n n z e i c h n e t that along the nozzle row parallel to the nozzle gap (10), a further pair of nozzle lips (11) is provided with a further adjustable continuous nozzle gap (13).
5. Vorrichtung nach Anspruch 4, d a d u r c h g e k e n n z e i c h n e t , daß eine5. Apparatus according to claim 4, d a d u r c h g e k e n n z e i c h n e t that a
Dichtung (15) vorgesehen ist, mittels der das weitereSeal (15) is provided, by means of which the further
Düsenlippenpaar (11) gegenüber der Düsenzeile abdichtbar ist. Nozzle lip pair (11) can be sealed off from the nozzle row.
EP91912846A 1990-07-31 1991-07-09 Device for blowing off excess coating material when coating metal strip Expired - Lifetime EP0542765B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT9191912846T ATE105339T1 (en) 1990-07-31 1991-07-09 DEVICE FOR BLOWING OFF COATING MATERIAL WHEN COATING METAL STRIPS.

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4024229A DE4024229C1 (en) 1990-07-31 1990-07-31
DE4024229 1990-07-31
PCT/EP1991/001273 WO1992002656A1 (en) 1990-07-31 1991-07-09 Device for blowing off excess coating material when coating metal strip

Publications (2)

Publication Number Publication Date
EP0542765A1 true EP0542765A1 (en) 1993-05-26
EP0542765B1 EP0542765B1 (en) 1994-05-04

Family

ID=6411340

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91912846A Expired - Lifetime EP0542765B1 (en) 1990-07-31 1991-07-09 Device for blowing off excess coating material when coating metal strip

Country Status (7)

Country Link
US (1) US5346551A (en)
EP (1) EP0542765B1 (en)
CA (1) CA2088591C (en)
DE (2) DE4024229C1 (en)
ES (1) ES2057908T3 (en)
FI (1) FI95149C (en)
WO (1) WO1992002656A1 (en)

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US5401317A (en) * 1992-04-01 1995-03-28 Weirton Steel Corporation Coating control apparatus
DE4223343C1 (en) * 1992-07-16 1994-03-17 Duma Masch Anlagenbau Blow off device
DE4306394C1 (en) * 1993-03-02 1994-04-21 Duma Masch Anlagenbau Blow-off device and method for blowing off excess coating material
DE4342904C1 (en) * 1993-03-02 1995-04-27 Duma Masch Anlagenbau Blow off device
FR2721621B1 (en) * 1994-06-22 1996-08-23 Maubeuge Fer Device for blowing a gaseous blade for wiping a strip coming out of a coating bath.
US5958512A (en) * 1996-12-19 1999-09-28 Avery Dennison Corporation Method and apparatus for selectively removing or displacing a fluid on a web
AUPO473297A0 (en) 1997-01-22 1997-02-20 Industrial Automation Services Pty Ltd Coating thickness control
DE19729232C1 (en) 1997-07-09 1999-04-08 Duma Masch Anlagenbau Device for equalizing the gas pressure distribution through the outlet opening of a flat jet nozzle
US8151728B2 (en) * 2006-06-05 2012-04-10 Posco Gas wiping apparatus
US7563322B2 (en) * 2007-04-09 2009-07-21 West Virginia University Method and apparatus for online flow control over the span of a high aspect ratio slot jet
US8216033B2 (en) * 2008-02-22 2012-07-10 Process Air Solutions, Llc Low pressure blow-off assemblies and related methods

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DE2118253A1 (en) * 1971-04-15 1972-10-26 Demag Ag, 4100 Duisburg Method and device for regulating the air admission in coil coating systems
US3941086A (en) * 1973-08-08 1976-03-02 Italsider S.P.A. Fluid doctor blade
JPS55107767A (en) * 1979-02-14 1980-08-19 Nisshin Steel Co Ltd Controlling method for plated molten metal quantity by gas spray and gas-spraying nozzle
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JPS62133056A (en) * 1985-12-06 1987-06-16 Nippon Kokan Kk <Nkk> Gas wiping nozzle
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See references of WO9202656A1 *

Also Published As

Publication number Publication date
EP0542765B1 (en) 1994-05-04
FI930410A0 (en) 1993-01-29
FI930410A (en) 1993-02-17
CA2088591C (en) 1999-06-29
FI95149B (en) 1995-09-15
ES2057908T3 (en) 1994-10-16
CA2088591A1 (en) 1992-02-01
US5346551A (en) 1994-09-13
FI95149C (en) 1995-12-27
DE4024229C1 (en) 1991-07-18
DE59101588D1 (en) 1994-06-09
WO1992002656A1 (en) 1992-02-20

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