EP0542765B1 - Device for blowing off excess coating material when coating metal strip - Google Patents
Device for blowing off excess coating material when coating metal strip Download PDFInfo
- Publication number
- EP0542765B1 EP0542765B1 EP91912846A EP91912846A EP0542765B1 EP 0542765 B1 EP0542765 B1 EP 0542765B1 EP 91912846 A EP91912846 A EP 91912846A EP 91912846 A EP91912846 A EP 91912846A EP 0542765 B1 EP0542765 B1 EP 0542765B1
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- European Patent Office
- Prior art keywords
- nozzle
- blowing
- nozzles
- metal strip
- lips
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- 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.
- blow-off device is known from DE-OS 3619805.
- the excess coating agent in particular zinc or aluminum
- 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 the best possible blow-off conditions.
- 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 blowing 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 part nozzles, which can be acted upon separately with a blow-off medium, and whose respective part nozzle gaps adjoin one another to form a section-wise composed nozzle gap, are arranged in the transverse direction of the band.
- the invention is characterized in that the blow-off nozzle is designed as a row of nozzles with individual partial nozzles, each of the partial nozzles being able to be subjected to different pressures in order to be able to adjust the pressure profile along the width of the strip to be coated in an optimized manner.
- 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 sub-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 pressure, where necessary.
- the individual sub-nozzles can be switched off and adjusted to the respective bandwidth.
- each partial nozzle consists of a first nozzle half and a second nozzle half, which include a channel for the blow-off medium between them, the channel in the region of the nozzle gap being formed exclusively in the first nozzle half and being there the second half of the nozzle on the two sides perpendicular to the transverse direction of the metal strip are solid, so that in the transverse direction of the strip by interchanging the first and second half of the nozzle alternating arrangement of the partial nozzles, the respective second half of the nozzle adjacent to the adjacent first half of the nozzle with the area one of each massive sides seals.
- This embodiment results in a particularly simple geometric structure, since the same basic constructional units can be assumed for the entire nozzle row and these only have to be lined up alternately accordingly.
- the particular advantage is 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.
- the partial nozzles arranged in the edge region can also be pressurized separately from the others by compressed air.
- a further pair of nozzle lips with a further adjustable continuous nozzle gap is arranged 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 arranged by means of which the further pair of nozzle lips is sealed off from the partial nozzles.
- 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 compressed air connection 12 is provided, which is connected to a compressed air channel 16 and can be pressurized externally with compressed air.
- the compressed air channel 16 extends from the compressed air connection 12 to a nozzle gap opening 10.
- 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.
- 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 in the area outside the nozzle gap opening 10, 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. 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 .
- 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
Description
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
Eine solche Abblasvorrichtung ist aus der DE-OS 3619805 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 3619805. By means of such a known blow-off nozzle, the excess coating agent, in particular zinc or aluminum, is blown off 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 the best possible blow-off conditions.
Im praktischen Einsatz der bekannten Vorrichtung hat sich gezeigt, daß auf Grund der Bandwölbung oder Unebenheiten des Beschichtungsmaterials, ein gleichmäßiger Abblasvorgang nicht hinreichend möglich ist, da bei der bekannten Vorrichtung über die gesamte Breite des Düsenspaltes stets 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 is always the same pressure over the entire width of the nozzle gap.
Daher liegt der Erfindung die Aufgabe zugrunde, eine Vorrichtung der eingangs genannten Art dahingehend zu verbessern, daß ein die Unebenheiten des zu beschichtenden 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 blowing process which takes account of the unevenness of the strip to be coated is made possible.
Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß die Abblasdüse als Düsenzeile ausgebildet ist, wobei in Bandquerrichtung mindestens zwei, getrennt mit einem Abblasmedium beaufschlagbare gegeneinander abgedichtete Teildüsen angeordnet sind, deren jeweilige Teildüsenspalte unter Ausbildung eines abschnittsweise zusammengesetzten Düsenspaltes aneinander angrenzen.This object is achieved according to the invention in that the blow-off nozzle is designed as a nozzle row, with at least two part nozzles, which can be acted upon separately with a blow-off medium, and whose respective part nozzle gaps adjoin one another to form a section-wise composed nozzle gap, are arranged in the transverse direction of the band.
Die Erfindung zeichnet sich dadurch aus, daß die Abblasdüse als eine Düsenzeile mit einzelnen Teildüsen ausgebildet wird, wobei jede der Teildüsen mit unterschiedlichem Druck beaufschlagt werden kann, um somit das Druckprofil entlang der Breite des zu beschichtenden Bandes optimiert einstellen zu können. Hierdurch läßt sich die Vielfalt der Bearbeitungsmöglichkeiten deutlich erhöhen. Es ist beispielsweise auch denkbar, mit einer Düsenzeile zwei oder 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, wo dies erforderlich ist. Durch gezielte Abschaltung der einzelnen Teildüsen kann eine variable Anpassung an die jeweilige Bandbreite erfolgen.The invention is characterized in that the blow-off nozzle is designed as a row of nozzles with individual partial nozzles, each of the partial nozzles being able to be subjected to different pressures in order to be able to adjust the pressure profile along the width of the strip to be coated in an optimized manner. 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 sub-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 pressure, where necessary. Through targeted The individual sub-nozzles can be switched off and adjusted to the respective bandwidth.
Eine bevorzugte Ausführungsform der Erfindung ist darin zu sehen, daß jede Teildüse aus einer ersten Düsenhälfte und einer zweiten Düsenhälfte besteht, die zwischen sich einen Kanal für das Abblasmedium einschließen, wobei der Kanal im Bereich des Düsenspaltes ausschließlich in der ersten Düsenhälfte ausgebildet ist und wobei dort die zweite Düsenhälfte an den beiden senkrecht zur Querrichtung des Metallbandes liegenden Seiten massiv ausgeführt sind, so daß bei sich in Bandquerrichtung durch Vertauschen von erster und zweiter Düsenhälfte abwechselnder Anordnung der Teildüsen die jeweils an die benachbarte erste Düsenhälfte angrenzende zweite Düsenhälfte mit der Fläche jeweils einer der massiv ausgeführten Seiten abdichtet.A preferred embodiment of the invention is to be seen in the fact that each partial nozzle consists of a first nozzle half and a second nozzle half, which include a channel for the blow-off medium between them, the channel in the region of the nozzle gap being formed exclusively in the first nozzle half and being there the second half of the nozzle on the two sides perpendicular to the transverse direction of the metal strip are solid, so that in the transverse direction of the strip by interchanging the first and second half of the nozzle alternating arrangement of the partial nozzles, the respective second half of the nozzle adjacent to the adjacent first half of the nozzle with the area one of each massive sides seals.
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 constructional units can be assumed for the entire nozzle row and these only have to be lined up alternately accordingly. The particular advantage is 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 die Stirnseiten der äußersten Teildüsen der Düsenzeile mit Abdichtplatten versehen sind, können auch die im Randbereich angeordneten Teildüsen separat von den anderen mit Druckluft beaufschlagt werden.Because the end faces of the outermost partial nozzles of the nozzle row are provided with sealing plates, the partial nozzles arranged in the edge region can also be pressurized separately from the others by compressed air.
Darüber hinaus ist bei einer weiteren Ausgestaltung der Erfindung vorgesehen, daß entlang der Düsenzeile ein weiteres Düsenlippenpaar mit einem weiteren verstellbaren durchgehenden Düsenspalt angeordnet 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.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 arranged 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.
Eine Umsetzung der durch die erste bzw. zweite Düsenhälfte gebildeten Druckbedingungen ohne nennenswerten Druckverlust in den durch das weitere Düsenlippenpaar gebildeten weiteren Düsenspalt ergibt sich, wenn eine Dichtung angeordnet ist, mittels der das weitere Düsenlippenpaar gegenüber den Teildüsen abgedichtet ist.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 arranged 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 zeigen
Figur 1- eine perspektivische Ansicht einer erfindungsgemäßen Abblasvorrichtung,
Figur 2- einen Schnitt entlang der Linie I-I in
Figur 1, Figur 3- einen Schnitt entlang der Linie A-A in
Figur 2 und - Figur 4
- einen Schnitt entlang der Linie B-B in
Figur 2.
- Figure 1
- 2 shows a perspective view of a blow-off device according to the invention,
- Figure 2
- 2 shows a section along the line II in FIG. 1,
- Figure 3
- a section along the line AA in Figure 2 and
- Figure 4
- a section along the line BB in Figure 2.
Die erfindungsgemäße Abblasvorrichtung besteht im wesentlichen aus einem Düsenkörper, welcher im rechten Teil von Figur 2 dargestellt ist und welcher mittels einer Befestigungsschraube 9 an einem Grundkörper 1 befestigt ist. Unterhalb der Befestigungsschraube 9 im Grundkörper 1 ist ein Druckluftanschluß 12 vorgesehen, welcher mit einem 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
Der Druckluftkanal 16 erstreckt sich von dem Druckluftanschluß 12 bis hin zu einer Düsenspaltöffnung 10.The
Der Druckluftkanal 16 wird dabei umschlossen von einer ersten Düsenhälfte 3 und einer zweiten Düsenhälfte 4, welche mittels Spannschrauben 5 miteinander verbunden sind.The
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.In the area of the
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.The second nozzle half 4 has a shoulder 4a in its solid area, on which a
Die im Bereich der Düsenspaltöffnung 10 angeordneten Bereiche der ersten Düsenhälfte 3 und der zweite Düsenhälfte 4 wirken dabei in der Art eines Düsenlippenpaares zusammen.The regions of the
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.A further pair of
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.As is apparent 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
Durch die Ausbildung des massiven Bereichs der jeweiligen zweiten Düsenhälften 4 ist gewährleistet, daß zwischen den 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.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
Bei der zeilenförmigen Anordnung der einzelnen Teildüsen entsteht der in Figur 3 dargestellte in der Art einer Rechteckfunktion ausgebildete Spalt 10, wobei die einzelnen Rechteckabschnitte um die Breite des Düsenspaltes 10 versetzt sind.In the line-shaped arrangement of the individual partial nozzles, the
Demgegenüber ist der an der Spitze des weiteren Dichtlippenpaares 11 ausgebildete Druckluftspalt 13, wie in Figur 4 dargestelt ist, linear.In contrast, the
Durch die Ausgestaltung der Abblasvorrichtung als Düsenzeile mit durchgehendem Düsenspalt läßt sich in jedem 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 nebeneinanderliegenden schmaleren Bändern mittels einer einzigen Abblasvorrichtung 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, the blowing pressures being adjusted accordingly differently. This means that different coating runs can be produced at the same time.
Claims (5)
- A device for blowing off excess coating material, more particularly liquid zinc or aluminium, in the coating of metal strips, having a blowing-off nozzle which can be operated by a blowing-off medium and whose nozzle body (3, 4) is attached to a base body (1) and whose mutually adjustable nozzle lips form a nozzle orifice (10) extending in the transverse direction of the metal strip, characterized in that the blowing-off nozzle takes the form of a line of nozzles, at least two component nozzles (2) sealed in relation to one another and separately operable by a blowing-off medium being disposed in the transverse direction of the strip, their orifices (10) adjoining one another to form an orifice made up in sections.
- A device according to claim 1, characterized in that each component nozzle (2) consists of a first nozzle half (3) and a second nozzle half (4) enclosing between themselves a channel (16) for the blowing-off medium, the channel (16) being provided exclusively in the first nozzle half (3) in the zone of the nozzle orifice (10), while at that place the second nozzle half (4) is constructed solid on the two sides lying perpendicularly to the transverse direction of the metal strip, so that when the component nozzles (2) are disposed alternately in the transverse direction of the strip by the interchanging of the first and the second nozzle halves, each second nozzle half (4) adjoining the adjacent first nozzle half (3) creates a seal with the face of one of the solid sides.
- A device according to claims 1 or 2, characterized in that the end faces of the outermost component nozzles (2) have sealing plates (7).
- A device according to one of claims 1 to 3, characterized in that a further pair of nozzle lips (11) having a further adjustable continuous nozzle orifice (13) is disposed parallel with the nozzle orifice (10) along the line of nozzles.
- A device according to claim 4, characterized in that a seal (15) is provided by means of which the further pair of nozzle lips (11) can be sealed off from the line of nozzles.
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 EP0542765A1 (en) | 1993-05-26 |
| EP0542765B1 true 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) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2093359A5 (en) * | 1970-06-11 | 1972-01-28 | Armco Steel Corp | Sensing a strip edge - using sonic sensor generating fluidic - signals which effect position - correction |
| 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 |
| US4513915A (en) * | 1982-12-06 | 1985-04-30 | The Kohler Coating Machinery Corporation | Nozzle construction for coating equipment |
| JPS62133056A (en) * | 1985-12-06 | 1987-06-16 | Nippon Kokan Kk <Nkk> | Gas wiping nozzle |
| DE3760425D1 (en) * | 1986-06-12 | 1989-09-14 | Duma Konstruktionsburo | Blow-off device for the continuous two-sided coating of strip metal |
-
1990
- 1990-07-31 DE DE4024229A patent/DE4024229C1/de not_active Expired - Fee Related
-
1991
- 1991-07-09 DE DE59101588T patent/DE59101588D1/en not_active Expired - Lifetime
- 1991-07-09 CA CA002088591A patent/CA2088591C/en not_active Expired - Lifetime
- 1991-07-09 ES ES91912846T patent/ES2057908T3/en not_active Expired - Lifetime
- 1991-07-09 EP EP91912846A patent/EP0542765B1/en not_active Expired - Lifetime
- 1991-07-09 WO PCT/EP1991/001273 patent/WO1992002656A1/en active IP Right Grant
- 1991-07-09 US US07/976,986 patent/US5346551A/en not_active Expired - Lifetime
-
1993
- 1993-01-29 FI FI930410A patent/FI95149C/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| 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 |
| EP0542765A1 (en) | 1993-05-26 |
| WO1992002656A1 (en) | 1992-02-20 |
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