EP0249234A1 - Blow-off device for the continuous two-sided coating of strip metal - Google Patents

Blow-off device for the continuous two-sided coating of strip metal Download PDF

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Publication number
EP0249234A1
EP0249234A1 EP87108473A EP87108473A EP0249234A1 EP 0249234 A1 EP0249234 A1 EP 0249234A1 EP 87108473 A EP87108473 A EP 87108473A EP 87108473 A EP87108473 A EP 87108473A EP 0249234 A1 EP0249234 A1 EP 0249234A1
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EP
European Patent Office
Prior art keywords
nozzle
blow
gap
metal strip
edge
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Granted
Application number
EP87108473A
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German (de)
French (fr)
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EP0249234B1 (en
EP0249234B2 (en
Inventor
Heinrich Pannenbecker
Ronald Jabs
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Duma Konstruktionsbuero
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Duma Konstruktionsbuero
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Priority to AT87108473T priority Critical patent/ATE45390T1/en
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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 during the continuous coating of metal strip on both sides, in particular when galvanizing steel strip, with a blow-off nozzle which is arranged parallel to the metal strip surface and has a compressed-air blow-off nozzle, the nozzle gap of which is formed by two mutually adjustable nozzle lips, the gap length of the blow-off nozzle being greater than the width of the metal band.
  • a blow-off nozzle is arranged on both sides of the strip that is led out of a coating agent bath.
  • the length of the blow-off nozzle must always be a safety distance greater than the bandwidth, so that reliable blowing off can also take place in the area of the strip edge.
  • the compressed air jets of the two blow-off nozzles directly opposite each other in the area outside the strip edges cause air swirling to occur.
  • the air turbulence also leads to a deterioration in the quality of the strip coating, since this becomes uneven in the area of the strip edges, ie so-called "growths" occur at the strip edges.
  • edge nozzles are used in the edge region of the belt, which reduce the air turbulence mentioned at the edges by targeted blowing on the latter. It is known to adjust these edge nozzles externally at the relevant points to the respective strip edge.
  • manual adjustment of the edge nozzles with regard to the blowing direction and the amount of air is very complex and must always be carried out anew when the metal bandwidth changes.
  • this results in an additional amount of compressed air during blowing which, since the blowing takes place in the immediate vicinity of the coating agent bath, favors an increased formation of slag on the surface of the coating agent.
  • the object of the invention is therefore to create a device of the type mentioned at the outset which enables economical use of compressed air which is optimized for the respective metal strip conditions and improved handling of the device.
  • This object is achieved in that a cover element guided by the blow-off nozzle is provided, by means of which the compressed air supply to the nozzle gap can be covered in the region outside the gap length which is respectively adapted to the metal strip width.
  • the solution according to the invention is characterized in that the effective nozzle gap length is in each case set to the suitable value which is predetermined by the product. Due to the optimally metered supply of compressed air, edge growth of the coating material on the metal strip edges due to inhomogeneous air flow conditions is effectively avoided. Because the cover element is guided by the blow-off nozzle, it forms a compact unit with it, which makes the handling of the device much easier. By covering the amount of air gap that is not required for the respective application, compressed air is saved on the one hand and therefore less compressed air escapes into the outside area in the area of the coating agent bath, thereby reducing the tendency to form slag.
  • the device is particularly advantageous because in the edge region of the metal strip there is no direct, mutual flow of the compressed air from the two blow-off nozzles respectively assigned to the strip sides. This effectively suppresses flow noise at the belt edges.
  • the structural unit of the blow-off nozzle, edge nozzle and guide belt allows both a functionally reliable manual setting of the blow-off conditions and the possibility of an automatic adjustment of the nozzle gap length as a result of a motor drive controlling the guide belt, so that the blow-off conditions can be constantly adapted to the respective belt path.
  • the blow-off nozzle 1 is arranged with its nozzle gap 2 at a certain distance from a side surface of the metal strip 33 to be coated which is guided past it.
  • the blow-off air is first introduced into the chamber a of the blow-off nozzle 1 from an external compressed air source and passes through one Perforated wall 19 in a prechamber b. From the pre-chamber b, the compressed air passes through a filter disk 8, which consists of a porous material, in particular sintered bronze with a pore size of at least 80 ⁇ m, into the nozzle chamber c.
  • the nozzle space c is formed by nozzle lips 4 which open the nozzle gap 2 opposite one another.
  • Each of the two nozzle lips 4 is fastened to the corresponding upper or lower housing part of the blow-off nozzle 1, ie to the upper part 3 or to the base body 5, by screw connections. While the base body 5 is stationary, the upper part 3 of the blow-off nozzle is deformable, so that the size of the nozzle gap 2 can be adjusted continuously from the outer region of the nozzle 1 by adjusting an adjusting screw 7 acting between the lower and the upper part of the housing.
  • the amount of blow-off air flowing onto the belt can be adjusted.
  • a plurality of adjusting screws 7 are provided over the width of the blow-off nozzle, so that the profile of the compressed air distribution can be variably adjusted over the width of the metal strip 33. This allows the blow-off device e.g. to be adapted over the course of the bandwidth to different viscosity ratios of the coating agent in the area of the blow-off nozzle 1 by appropriate metering of the compressed air.
  • the entire blow-off nozzle 1 can be swiveled by an angle of ⁇ 20 ° with respect to the vertical to the tape running direction with respect to a pivot point 32.
  • longitudinal grooves 12 are provided over the length of the blow-off nozzle 1, through which a guide band 11 (FIG. 2) can be moved.
  • the leader band 11 is a flexible steel band which is guided in the area outside the blow-off nozzle in a cylindrical body 13 which is attached laterally to the blow-off nozzle 1 and is coupled to a motor drive at its end remote from the blow-off nozzle 1.
  • the slide block 17 forms the separating surface between the area of the nozzle gap released for the compressed air outlet and the area of the nozzle gap length covered by the guide band 11 for the compressed air and prevents the compressed air from passing from the open, band-side inner area into the hidden area.
  • the position of the guide belt 11 is adjusted so that the edge nozzles 21 are always directed towards the area of the edges of the metal belt 33 and that each of the two open inner areas covers approximately half of the metal belt width.
  • the edge blow-off air is supplied to the edge nozzles 21 through a flexible steel hose 24 which is arranged around the guide belt 11. This is connected on the one hand to the area of the edge nozzle 21 and on the other hand opens into the cylindrical body 13 at the edge of the blow-off nozzle 1 and is connected there to the compressed air source 34.
  • the slide block 17 has a dirt-repellent plate 20 that is aligned with the nozzle gap 2 and engages in it.
  • the dirt-repellent plate 20 is moved for the purpose of cleaning the nozzle gap from residues of the coating agent in a cleaning stroke over the contaminated area of the nozzle gap. This cleaning stroke takes place e.g. during the changeover from one metal strip to the next.
  • the dirt-repellent plate 20 is brought by the drive 13 by means of the guide belt 11 in a rapid gear to the center of the device and back into the working position.
  • the maximum available pressure of the edge blow-off air 22 is applied to the edge nozzles 21.
  • Fig. 4 shows the arrangement shown according to the first embodiment in connection with the external electronic components provided for automatic operation.
  • the motor drive located in the cylindrical body 13 is controlled by a computer 16, which receives a sensor signal from the sensors 15 corresponding to the width of the metal strip 33 passed by them.
  • a computer 16 which receives a sensor signal from the sensors 15 corresponding to the width of the metal strip 33 passed by them.
  • sensors 25 are provided, which measure the layer thickness of the metal strip 33 provided with the coating agent and also feed this measured value into the computer 16.
  • the amount of blow-off air 18 supplied to the effective nozzle gap 2 is set on the one hand via a control valve 27 and on the other hand the edge blow-off air 22 for the edge nozzles 21 is set via a control valve 26.
  • the set amount of blow-off air enters the blow-off nozzle 1 via a tubular opening on the outer jacket of the cylindrical body 13 and is guided from there through the interior of the blow-off nozzle 1 into the compressed air space a shown in FIG. 1. Because the filter disk 8 is arranged over the entire length of the blow-off nozzle 1 in front of the nozzle gap 2, swirling of the compressed air in the region of the nozzle gap is prevented, since the porous filter disk offers resistance to the compressed air provided, so that pressure differences along the nozzle gap are equalized .
  • the amount of edge blow-off air 22 set by the control valve 26 is fed to the flexible hose 24 and thus to the edge nozzles 21 via a corresponding opening on the cover side of the cylindrical body 13.
  • FIG. 5 shows a second exemplary embodiment according to the invention, which differs from the first exemplary embodiment only in that, on the side of the base body 5 of the blow-off nozzle 1 facing the coating agent bath 31, an additional heat protection plate 29 with an intermediate layer insulating it from the base body 5 30 has.
  • FIG. 6 A third exemplary embodiment of the invention is shown in FIG. 6, which differs from the first exemplary embodiment only in that a protective plate 28 is provided in the area of the outer space around the blow-off nozzle 1 which is not covered by the metal strip 33. This avoids that dirt particles from the environment in the area caused by the flow of compressed air of the tape 33 to be coated and can thereby contaminate it. Furthermore, this mudguard 28 also serves to reduce the sound emission caused by the air flow and to transfer the heat from the coating agent bath 31 to the blow-off nozzle 1.

Abstract

1. Device for blowing-off excess coating material in the continuous two-sided coating of strip metal, in particular in the galvanizing of strip steel, with a compressed air admitting blow-off nozzle (1), arranged parallel to the strip metal surface (33), the nozzle gap (2) of which is formed by two mutually adjustable nozzle lips (4), the gap length of the blow-off nozzle (1) being greater than the width of the strip metal, characterized in that a cover element (11), guided by the blow-off nozzle (1), is provided, by which element the compressed air supply to the nozzle gap (2) can be covered in the region outside the gap length adapted in each case to the strip metal width.

Description

Die Erfindung betrifft eine Vorrichtung zum Abblasen von überflüssigem Beschichtungsmaterial beim kontinuierlichen beidseitigen Beschichten von Metallband, insbesondere beim Verzinken von Stahlband, mit einer parallel zur Metallbandfläche angeordneten, druckluftbeaufschlagten Abblasdüse, deren Düsenspalt durch zwei gegeneinander verstellbare Düsenlippen gebildet wird, wobei die Spaltlänge der Abblasdüse größer ist als die Breite des Metallbandes.The invention relates to a device for blowing off superfluous coating material during the continuous coating of metal strip on both sides, in particular when galvanizing steel strip, with a blow-off nozzle which is arranged parallel to the metal strip surface and has a compressed-air blow-off nozzle, the nozzle gap of which is formed by two mutually adjustable nozzle lips, the gap length of the blow-off nozzle being greater than the width of the metal band.

Eine solche Vorrichtung gehört zum Stand der Technik. Beim beidseitigen Beschichten von Metallband ist auf beiden Seiten des aus einem Beschichtungsmittelbad herausgeführten Bandes jeweils eine Abblasdüse angeordnet. Um Ungenauigkeiten in der Breite des zu beschichtenden, an der Abblasdüse vorbeigeführten Metallbandes zu berücksichtigen, muß die Länge der Abblasdüse stets um einen Sicherheitsabstand größer sein als die Bandbreite, damit auch im Bereich der Bandkante ein sicheres Abblasen erfolgen kann. Hierbei sind jedoch die Druckluftstrahlen der beiden sich im Bereich außerhalb der Bandkanten unmittelbar gegenüberstehenden Abblasdüsen gegeneinander gerichtet und bewirken die Entstehung von Luftverwirbelungen. Dies hat zum einen einen unnötigen Druckluftverbrauch sowie eine unerwünschte Geräuschemission infolge des Vorbeistreichens der Druckluft an den Bandkanten zur Folge. Andererseits führt die Luftverwirbelung auch zu einer Qualitätsbeeinträchtigung der Bandbeschichtung, da diese im Bereich der Bandkanten ungleichmäßig wird, d.h. es entstehen sogenannte "Aufwachsungen" an den Bandkanten.Such a device is part of the prior art. When coating metal strips on both sides, a blow-off nozzle is arranged on both sides of the strip that is led out of a coating agent bath. In order to take into account inaccuracies in the width of the metal strip to be coated, which is guided past the blow-off nozzle, the length of the blow-off nozzle must always be a safety distance greater than the bandwidth, so that reliable blowing off can also take place in the area of the strip edge. In this case, however, the compressed air jets of the two blow-off nozzles directly opposite each other in the area outside the strip edges cause air swirling to occur. On the one hand, this results in unnecessary consumption of compressed air and undesirable noise emissions as a result of the compressed air flowing past the belt edges. On the other hand, the air turbulence also leads to a deterioration in the quality of the strip coating, since this becomes uneven in the area of the strip edges, ie so-called "growths" occur at the strip edges.

Als Gegenmaßnahme hierzu werden im Kantenbereich des Bandes zusätzliche Druckluftdüsen, sogenannte Kantendüsen, eingesetzt, die die genannten Luftverwirbelungen an den Kanten durch gezieltes Anblasen derselben verringern. Es ist bekannt, diese Kantendüsen extern an den betreffenden Stellen auf die jeweilige Bandkante gerichtet einzustellen. Die manuelle Einstellung der Kantendüsen hinsichtlich der Blasrichtung und der Luftmenge ist jedoch sehr aufwendig und muß bei sich ändernder Metallbandbreite stets neu erfolgen. Darüber hinaus tritt hierdurch eine zusätzliche Druckluftmenge beim Abblasen auf, die, da das Abblasen in unmittelbarer Umgebung des Beschichtungsmittelbades erfolgt, eine vermehrte Schlackenbildung auf der Oberfläche des Beschichtungsmittels begünstigt.As a countermeasure to this, additional compressed air nozzles, so-called edge nozzles, are used in the edge region of the belt, which reduce the air turbulence mentioned at the edges by targeted blowing on the latter. It is known to adjust these edge nozzles externally at the relevant points to the respective strip edge. However, manual adjustment of the edge nozzles with regard to the blowing direction and the amount of air is very complex and must always be carried out anew when the metal bandwidth changes. In addition, this results in an additional amount of compressed air during blowing, which, since the blowing takes place in the immediate vicinity of the coating agent bath, favors an increased formation of slag on the surface of the coating agent.

Daher liegt der Erfindung die Aufgabe zugrunde, eine Vorrichtung der eingangs genannten Art zu schaffen, die eine sparsame und auf die jeweiligen Metallbandbedingungen optimierte Druckluftausnutzung sowie eine verbesserte Handhabbarkeit der Vorrichtung ermöglicht.The object of the invention is therefore to create a device of the type mentioned at the outset which enables economical use of compressed air which is optimized for the respective metal strip conditions and improved handling of the device.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß ein von der Abblasdüse geführtes Abdeckelement vorgesehen ist, durch das die Druckluftzufuhr zum Düsenspalt im Bereich außerhalb der an die Metallbandbreite jeweils angepaßten Spaltlänge abdeckbar ist.This object is achieved in that a cover element guided by the blow-off nozzle is provided, by means of which the compressed air supply to the nozzle gap can be covered in the region outside the gap length which is respectively adapted to the metal strip width.

Die erfindungsgemäße Lösung zeichnet sich dadurch aus, daß die wirksame Düsenspaltlänge jeweils auf den geeigneten Wert eingestellt wird, der durch das Produkt vorgegeben ist. Durch die optimal dosierte Druckluftzufuhr werden Kantenaufwachsungen des Beschichtungsmaterials an den Metallbandkanten durch inhomogene Luftströmungsbedingungen wirksam vermieden. Dadurch, daß das Abdeckelement von der Abblasdüse geführt wird, bildet es mit ihr eine kompakte Einheit, wodurch die Handhabbarkeit der Vorrichtung sehr viel einfacher wird. Durch die Abdeckung der für den jeweiligen Anwendungsfall nicht erforderlichen Luftspaltmenge erfolgt einerseits eine Einsparung an Druckluft und dadurch ein geringerer Druckluftaustritt in den Außenraum in den Bereich des Beschichtungsmittelbades, wodurch die Neigung zur Schlackenbildung reduziert wird.The solution according to the invention is characterized in that the effective nozzle gap length is in each case set to the suitable value which is predetermined by the product. Due to the optimally metered supply of compressed air, edge growth of the coating material on the metal strip edges due to inhomogeneous air flow conditions is effectively avoided. Because the cover element is guided by the blow-off nozzle, it forms a compact unit with it, which makes the handling of the device much easier. By covering the amount of air gap that is not required for the respective application, compressed air is saved on the one hand and therefore less compressed air escapes into the outside area in the area of the coating agent bath, thereby reducing the tendency to form slag.

Insbesondere ist die Vorrichtung deswegen vorteilhaft, weil im Kantenbereich des Metallbandes kein direktes, gegenseitiges Anströmen der Druckluft aus den beiden den Bandseiten jeweils zugeordneten Abblasdüsen erfolgt. Hierdurch werden Strömungsgeräusche an den Bandkanten wirksam unterdrückt. Die konstruktive Einheit von Abblasdüse, Kantendüse und Führungsband gewährt sowohl eine funktionssichere manuelle Einstellung der Abblasbedingungen als auch die Möglichkeit einer automatischen Verstellung der Düsenspaltlänge infolge eines das Führungsband steuernden motorischen Antriebs, so daß eine ständige Anpassung der Abblasbedingungen an den jeweiligen Bandverlauf erfolgen kann.The device is particularly advantageous because in the edge region of the metal strip there is no direct, mutual flow of the compressed air from the two blow-off nozzles respectively assigned to the strip sides. This effectively suppresses flow noise at the belt edges. The structural unit of the blow-off nozzle, edge nozzle and guide belt allows both a functionally reliable manual setting of the blow-off conditions and the possibility of an automatic adjustment of the nozzle gap length as a result of a motor drive controlling the guide belt, so that the blow-off conditions can be constantly adapted to the respective belt path.

Weitere besondere Vorteile der Erfindung sind in den Unteransprüchen 4-12 gekennzeichnet.Further particular advantages of the invention are characterized in the subclaims 4-12.

Die Erfindung wird im folgenden anhand einer mehrere Ausführungsbeispiele zeigenden Zeichnung erläutert.The invention is explained below with reference to a drawing showing several exemplary embodiments.

Hierbei zeigen:

  • Fig. 1 ein erstes Ausführungsbeispiel der Erfindung im Querschnitt der in Fig. 2 eingezeichneten Linie A-A;
  • Fig. 2 eine Draufsicht auf das Ausführungsbeispiel nach Fig. 1;
  • Fig. 3 eine perspektivische Darstellung des Bereichs von Führungsband und Kantendüse nach dem ersten Ausführungsbeispiel;
  • Fig. 4 eine perspektivische Ansicht des ersten Ausführungsbeispiels einschließlich der externen Komponenten;
  • Fig. 5 einen Querschnitt durch ein zweites Ausführungsbeispiel; und
  • Fig. 6 einen Querschnitt durch ein drittes Ausführungsbeispiel.
Here show:
  • Fig. 1 shows a first embodiment of the invention in cross section of the line AA drawn in Fig. 2;
  • Fig. 2 is a plan view of the embodiment of Fig. 1;
  • 3 shows a perspective illustration of the region of the guide band and edge nozzle according to the first exemplary embodiment;
  • 4 is a perspective view of the first embodiment including the external components;
  • 5 shows a cross section through a second embodiment; and
  • Fig. 6 shows a cross section through a third embodiment.

Gemäß dem Ausführungsbeispiel nach Fig. 1 ist die Abblasdüse 1 mit ihrem Düsenspalt 2 in einem gewissen Abstand zu einer Seitenfläche des an ihr vorbeigeführten zu beschichtenden Metallbandes 33 angeordnet. Die Abblasluft wird zunächst aus einer externen Druckluftquelle in die Kammer a der Abblasdüse 1 eingeleitet und tritt durch eine Lochwand 19 in eine Vorkammer b ein. Von der Vorkammer b gelangt die Druckluft durch eine Filterscheibe 8, die aus einem porösen Material, insbesondere aus Sinterbronze mit einer Porenweite von mindestens 80 µm besteht, in den Düsenraum c. Der Düsenraum c wird durch Düsenlippen 4 gebildet, die einander gegenüberstehend den Düsenspalt 2 freigeben. Jede der beiden Düsenlippen 4 ist an dem entsprechenden oberen bzw. unteren Gehäuseteil der Abblasdüse 1, d.h. am Oberteil 3 bzw. am Grundkörper 5, durch Schraubverbindungen befestigt. Während der Grundkörper 5 ortsfest ist, ist das Oberteil 3 der Abblasdüse verformbar, so daß der Düsenspalt 2 durch Verstellung einer zwischen dem unteren und dem oberen Teil des Gehäuses wirkenden Stellschraube 7 in seiner Größe stufenlos vom Außenbereich der Düse 1 aus verstellbar ist.According to the exemplary embodiment according to FIG. 1, the blow-off nozzle 1 is arranged with its nozzle gap 2 at a certain distance from a side surface of the metal strip 33 to be coated which is guided past it. The blow-off air is first introduced into the chamber a of the blow-off nozzle 1 from an external compressed air source and passes through one Perforated wall 19 in a prechamber b. From the pre-chamber b, the compressed air passes through a filter disk 8, which consists of a porous material, in particular sintered bronze with a pore size of at least 80 μm, into the nozzle chamber c. The nozzle space c is formed by nozzle lips 4 which open the nozzle gap 2 opposite one another. Each of the two nozzle lips 4 is fastened to the corresponding upper or lower housing part of the blow-off nozzle 1, ie to the upper part 3 or to the base body 5, by screw connections. While the base body 5 is stationary, the upper part 3 of the blow-off nozzle is deformable, so that the size of the nozzle gap 2 can be adjusted continuously from the outer region of the nozzle 1 by adjusting an adjusting screw 7 acting between the lower and the upper part of the housing.

Hierdurch läßt sich die Menge der auf das Band einströmenden Abblasluft einstellen. Wie aus Fig. 2 hervorgeht, sind über der Breite der Abblasdüse mehrere Stellschrauben 7 vorgesehen, so daß das Profil der Druckluftverteilung über der Breite des Metallbandes 33 variabel einstellbar ist. Hierdurch kann die Abblasvorrichtung z.B. an über den Verlauf der Bandbreite auf unterschiedliche Viskositätsverhältnisse des Beschichtungsmittels im Bereich der Abblasdüse 1 durch entsprechende Dosierung der Druckluft angepaßt werden.In this way, the amount of blow-off air flowing onto the belt can be adjusted. As can be seen from FIG. 2, a plurality of adjusting screws 7 are provided over the width of the blow-off nozzle, so that the profile of the compressed air distribution can be variably adjusted over the width of the metal strip 33. This allows the blow-off device e.g. to be adapted over the course of the bandwidth to different viscosity ratios of the coating agent in the area of the blow-off nozzle 1 by appropriate metering of the compressed air.

Die gesamte Abblasdüse 1 ist, bezogen auf einen Drehpunkt 32, gegenüber der Vertikalen zur Bandlaufrichtung um einen Winkel von ±20° schwenkbar.The entire blow-off nozzle 1 can be swiveled by an angle of ± 20 ° with respect to the vertical to the tape running direction with respect to a pivot point 32.

Im Bereich der Verbindung zwischen Düsenlippen 4 und Oberteil 3 bzw. Grundkörper 5 sind über die Länge der Abblasdüse 1 Längsnuten 12 vorgesehen, durch die ein Führungsband 11 (Fig. 2) bewegbar ist. Das Führungsband 11 ist ein flexibles Stahlband, welches im Bereich außerhalb der Abblasdüse in einem seitlich an die Abblasdüse 1 angebrachten zylindrischen Körper 13 geführt ist und an seinem der Abblasdüse 1 abgewandten Ende mit einem motorischen Antrieb gekoppelt ist.In the area of the connection between nozzle lips 4 and upper part 3 or base body 5, longitudinal grooves 12 are provided over the length of the blow-off nozzle 1, through which a guide band 11 (FIG. 2) can be moved. The leader band 11 is a flexible steel band which is guided in the area outside the blow-off nozzle in a cylindrical body 13 which is attached laterally to the blow-off nozzle 1 and is coupled to a motor drive at its end remote from the blow-off nozzle 1.

Die Drehbewegung des motorischen Antriebs wird auf diese Weise in eine lineare Bewegung des Führungsbandes 11 in den Nuten 12 der Abblasdüse 1 umgesetzt. Wie aus Fig. 4 hervorgeht, ist an beiden Seiten der Abblasdüse 1 je ein zylindrischer Körper 13 vorgesehen, der jeweils ein Führungsband 11 trägt, so daß sich eine symmetrische Anordnung ergibt. An dem zur Abblasdüse 1 hinweisenden Ende eines jeden Führuhgsbandes 11 ist je ein Schieberblock 17 und je eine Kantendüse 21 befestigt, die somit gemeinsam mit dem jeweils zugehörigen Führungsband 11 entlang der Abblasdüse 1 verschieblich sind.The rotational movement of the motor drive is converted in this way into a linear movement of the guide belt 11 in the grooves 12 of the blow-off nozzle 1. As is apparent from Fig. 4, a cylindrical body 13 is provided on each side of the blow-off nozzle 1, each carrying a guide band 11, so that there is a symmetrical arrangement. At the end of each guide belt 11 pointing towards the blow-off nozzle 1, a slide block 17 and an edge nozzle 21 each are fastened, which are thus displaceable along with the respective guide belt 11 along the blow-off nozzle 1.

Der Schieberblock 17 bildet die Trennfläche zwischen dem für den Druckluftaustritt freigegebenen Bereich des Düsenspaltes und dem durch das Führungsband 11 für die Druckluft abgedeckten Bereich der Düsenspaltlänge und verhindert einen übrgang der Druckluft aus dem offenen, bandseitigen Innenbereich in den verdeckten Bereich. Im Betrieb ist die Lage des Führungsbandes 11 so eingestellt, daß die Kantendüsen 21 stets auf den Bereich der Kanten des Metallbandes 33 gerichtet sind, und daß jeder der beiden offenen Innenbereiche etwa die Hälfte der Metallbandbreite überstreicht. Die Zuführung der Kantenabblasluft zu den Kantendüsen 21 erfolgt durch einen flexiblen Stahlschlauch 24, der um das Führungsband 11 angeordnet ist. Dieser ist einerseits mit dem Bereich der Kantendüse 21 verbunden und mündet andererseits in den zylindrischen Körper 13 am Rande der Abblasdüse 1 und ist dort mit der Druckluftquelle 34 verbunden.The slide block 17 forms the separating surface between the area of the nozzle gap released for the compressed air outlet and the area of the nozzle gap length covered by the guide band 11 for the compressed air and prevents the compressed air from passing from the open, band-side inner area into the hidden area. In operation, the position of the guide belt 11 is adjusted so that the edge nozzles 21 are always directed towards the area of the edges of the metal belt 33 and that each of the two open inner areas covers approximately half of the metal belt width. The edge blow-off air is supplied to the edge nozzles 21 through a flexible steel hose 24 which is arranged around the guide belt 11. This is connected on the one hand to the area of the edge nozzle 21 and on the other hand opens into the cylindrical body 13 at the edge of the blow-off nozzle 1 and is connected there to the compressed air source 34.

Der Schieberblock 17 weist ein mit dem Düsenspalt 2 fluchtendes und in diesen eingreifendes Schmutzabweisungsblech 20 auf. Das Schmutzabweisungsblech 20 wird zum Zwecke der Reinigung des Düsenspaltes von Resten des Beschichtungsmittels in einem Reinigungshub über den verschmutzten Bereich des Düsenspaltes verfahren. Dieser Reinigungshub erfolgt z.B. während der Umrüstung von einer Metallbandbreite auf die nächste. Hierbei wird das Schmutzabweisungsblech 20 durch den Antrieb 13 mittels des Führungsbandes 11 in einem Schnellgang zur Vorrichtungsmitte und wieder zurück in die Arbeitsstellung gebracht. Während des Reinigungshubes werden die Kantendüsen 21 mit dem maximal zur Verfügung stehenden Druck der Kantenabblasluft 22 beaufschlagt.The slide block 17 has a dirt-repellent plate 20 that is aligned with the nozzle gap 2 and engages in it. The dirt-repellent plate 20 is moved for the purpose of cleaning the nozzle gap from residues of the coating agent in a cleaning stroke over the contaminated area of the nozzle gap. This cleaning stroke takes place e.g. during the changeover from one metal strip to the next. Here, the dirt-repellent plate 20 is brought by the drive 13 by means of the guide belt 11 in a rapid gear to the center of the device and back into the working position. During the cleaning stroke, the maximum available pressure of the edge blow-off air 22 is applied to the edge nozzles 21.

Fig. 4 zeigt die dargestellte Anordnung nach dem ersten Ausführungsbeispiel im Zusammenhang mit den für einen automatischen Betrieb vorgesehenen externen elektronischen Komponenten. Der im zylindrischen Körper 13 befindliche motorische Antrieb wird von einem Rechner 16 angesteuert, der von den Meßfühlern 15 ein Sensorsignal entsprechend der von diesen gemessenen Breite des vorbeigeführten Metallbandes 33 erhält. Hierdurch wird durch das Verstellen des Führungsbandes 11 die wirksame Düsenspaltlänge für den Druckluftaustritt freigegeben und die Kantendüse 21 entsprechend der Bandbreite positioniert.Fig. 4 shows the arrangement shown according to the first embodiment in connection with the external electronic components provided for automatic operation. The motor drive located in the cylindrical body 13 is controlled by a computer 16, which receives a sensor signal from the sensors 15 corresponding to the width of the metal strip 33 passed by them. As a result, by adjusting the guide band 11, the effective nozzle gap length for the compressed air outlet is released and the edge nozzle 21 is positioned according to the bandwidth.

Weiterhin sind Sensoren 25 vorgesehen, die die Schichtdicke des mit dem Beschichtungsmittel versehenen Metallbandes 33 messen und diesen Meßwert ebenfalls in den Rechner 16 einspeisen. Zur Regelung der Beschichtungsdicke auf den gewünschten Sollwert wird einerseits die Menge der dem wirksamen Düsenspalt 2 zugeführten Abblasluft 18 über ein Regelventil 27 und zum anderen die Kantenabblasluft 22 für die Kantendüsen 21 über ein Regelventil 26 eingestellt.Furthermore, sensors 25 are provided, which measure the layer thickness of the metal strip 33 provided with the coating agent and also feed this measured value into the computer 16. To regulate the coating thickness to the desired setpoint, the amount of blow-off air 18 supplied to the effective nozzle gap 2 is set on the one hand via a control valve 27 and on the other hand the edge blow-off air 22 for the edge nozzles 21 is set via a control valve 26.

Die eingestellte Menge der Abblasluft tritt über eine rohrförmige Öffnung am Außenmantel des zylindrischen Körpers 13 in die Abblasdüse 1 ein und wird von dort aus durch den Innenraum der Abblasdüse 1 in den in Fig. 1 dargestellten Druckluftraum a geführt. Dadurch, daß auf der gesamten Länge der Abblasdüse 1 vor dem Düsenspalt 2 die Filterscheibe 8 angeordnet ist, wird eine Verwirbelung der Druckluft im Bereich des Düsenspaltes verhindert, da die poröse Filterscheibe der bereitgestellten Druckluft einen Widerstand bietet, so daß sich Druckunterschiede entlang des Düsenspaltes ausgleichen.The set amount of blow-off air enters the blow-off nozzle 1 via a tubular opening on the outer jacket of the cylindrical body 13 and is guided from there through the interior of the blow-off nozzle 1 into the compressed air space a shown in FIG. 1. Because the filter disk 8 is arranged over the entire length of the blow-off nozzle 1 in front of the nozzle gap 2, swirling of the compressed air in the region of the nozzle gap is prevented, since the porous filter disk offers resistance to the compressed air provided, so that pressure differences along the nozzle gap are equalized .

Die vom Regelventil 26 eingestellte Menge der Kantenabblasluft 22 wird über eine entsprechende Öffnung auf der Deckelseite des zylindrischen Körpers 13 dem flexiblen Schlauch 24 und somit den Kantendüsen 21 zugeführt.The amount of edge blow-off air 22 set by the control valve 26 is fed to the flexible hose 24 and thus to the edge nozzles 21 via a corresponding opening on the cover side of the cylindrical body 13.

In Fig. 5 ist ein zweites Ausführungsbeispiel gemäß der Erfindung dargestellt, welches sich von dem ersten Ausführungsbeispiel nur dadurch unterscheidet, daß an der dem Beschichtungsmittelbad 31 zugewandten Seite des Grundkörpers 5 der Abblasdüse 1 zusätzlich ein Wärmeschutzblech 29 mit einer dieses gegen den Grundkörper 5 isolierenden Zwischenschicht 30 aufweist. Hierdurch werden thermisch bedingte Verformungen der Abblasdüse 1 und dadurch hervorgerufene Betriebsstörungen, insbesondere beim automatischen Betrieb, wirksam vermieden.5 shows a second exemplary embodiment according to the invention, which differs from the first exemplary embodiment only in that, on the side of the base body 5 of the blow-off nozzle 1 facing the coating agent bath 31, an additional heat protection plate 29 with an intermediate layer insulating it from the base body 5 30 has. As a result, thermally induced deformations of the blow-off nozzle 1 and operational malfunctions caused thereby, in particular during automatic operation, are effectively avoided.

Ein drittes Ausführungsbeispiel der Erfindung ist in Fig. 6 dargestellt, welches sich vom ersten Ausführungsbeispiel nur dadurch unterscheidet, daß im nicht durch das Metallband 33 abgedeckten Bereich des Außenraumes um die Abblasdüse 1 ein Schutzblech 28 vorgesehen ist. Hierdurch wird vermieden, daß durch die Strömung der Druckluft bedingt Schmutzpartikel aus der Umgebung in den Bereich des zu beschichtenden Bandes 33 gezogen werden und dieses dadurch verunreinigen können. Weiterhin dient dieses Schutzblech 28 auch einer Verringerung der durch die Luftströmung bedingten Schallemission sowie der Übertragung der Wärme des Beschichtungsmittelbades 31 auf die Abblasdüse 1.A third exemplary embodiment of the invention is shown in FIG. 6, which differs from the first exemplary embodiment only in that a protective plate 28 is provided in the area of the outer space around the blow-off nozzle 1 which is not covered by the metal strip 33. This avoids that dirt particles from the environment in the area caused by the flow of compressed air of the tape 33 to be coated and can thereby contaminate it. Furthermore, this mudguard 28 also serves to reduce the sound emission caused by the air flow and to transfer the heat from the coating agent bath 31 to the blow-off nozzle 1.

Claims (13)

1. Vorrichtung zum Abblasen von überflüssigem Beschichtungsmaterial beim kontinuierlichen beidseitigen Beschichten von Metallband, insbesondere beim Verzinken von Stahlband, mit einer parallel zur Metallbandfläche (33) angeordneten, druckluftbeaufschlagten Abblasdüse (1), deren Düsenspalt (2) durch zwei gegeneinander verstellbare Düsenlippen (4) gebildet wird, wobei die Spaltlänge der Abblasdüse (1) größer ist als die Breite des Metallbandes, dadurch gekennzeichnet, daß ein von der Abblasdüse (1) geführtes Abdeckelement (11) vorgesehen ist, durch das die Druckluftzufuhr zum Düsenspalt (2) Bereich außerhalb der an die Metallbandbreite jeweils angepaßten Spaltlänge abdeckbar ist.1. Device for blowing off superfluous coating material during the continuous coating of metal strip on both sides, in particular when galvanizing steel strip, with a blow-off nozzle (1) which is arranged parallel to the metal strip surface (33) and has a nozzle gap (2) through two mutually adjustable nozzle lips (4) is formed, the gap length of the blow-off nozzle (1) being greater than the width of the metal strip, characterized in that a cover element (11) guided by the blow-off nozzle (1) is provided, through which the compressed air supply to the nozzle gap (2) area outside the gap length adapted to the metal band width can be covered. 2. Vorrichtung nach Anspruch 1, mit einer auf den Kantenbereich des Metallbandes einwirkenden Kantendüse (21), dadurch gekennzeichnet, daß das Abdeckelement ein flexibles Führungsband (11) ist, welches entlang einer Längsnut (12) im Bereich des Düsenspaltes bewegbar ist, und daß an dessen die Spaltlänge zur Metallbandkante hin begrenzender seite ein verschiebbarer Block (17) und die Kantendüse (21) angeordnet sind.2. Device according to claim 1, with an edge nozzle (21) acting on the edge region of the metal strip, characterized in that the cover element is a flexible guide strip (11) which can be moved along a longitudinal groove (12) in the region of the nozzle gap, and in that on the side of which delimits the gap length towards the metal strip edge, a displaceable block (17) and the edge nozzle (21) are arranged. 3. Vorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß das Führungsband (11) durch einen als Stellmotor zur automatischen Verstellung der Spaltlänge wirkenden motorischen Antrieb bewegbar ist, der mit dem Ausgang eines Rechners (16) verbunden ist, dessen Eingangssignal durch die die Breite des Metallbandes erfassenden Meßfühler (15) gebildet ist.3. Apparatus according to claim 1 or 2, characterized in that the guide belt (11) by a servomotor for automatic adjustment of the Gap length acting motor drive is movable, which is connected to the output of a computer (16) whose input signal is formed by the sensor (15) measuring the width of the metal strip. 4. Vorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der im Bereich der Verbindungsstelle zwischen Führungsband (11) und Kantendüse (21) angebrachte Schieberblock (17) ein mit dem Düsenspalt (2) fluchtendes und in diesen eingreifendes Schmutzabweisungsblech (20) zur Reinigung des Düsenspaltes (2) von Resten des Beschichtungsmaterials aufweist.4. Apparatus according to claim 1 or 2, characterized in that the in the region of the connection point between the guide band (11) and edge nozzle (21) attached slide block (17) with the nozzle gap (2) aligned and engaging in this dirt-repellent plate (20) Has cleaning of the nozzle gap (2) of residues of the coating material. 5. Vorrichtung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß das Führungsband (11) von einem flexiblen Metallschlauch (24) umgeben ist, durch den die Druckluftzufuhr zu den Kantendüsen (21) erfolgt.5. Device according to one of claims 1 to 4, characterized in that the guide band (11) is surrounded by a flexible metal hose (24) through which the compressed air supply to the edge nozzles (21) takes place. 6. Vorrichtung nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß die durch den Abstand der Düsenlippen (4) bestimmte Breite des Düsenspaltes (2) durch eine von außerhalb der Vorrichtung zugängliche Stellschraube (7) stufenlos verstellbar ist.6. Device according to one of claims 1 to 5, characterized in that the width of the nozzle gap (2) determined by the spacing of the nozzle lips (4) is infinitely adjustable by an adjusting screw (7) accessible from outside the device. 7. Vorrichtung nach Anspruch 6, dadurch gekennzeichnet, daß mehrere Stellschrauben (7) entlang der Düsenspaltlänge vorgesehen sind, durch die das Intensitätsprofil der Druckluftabblasung entlang der Spaltlänge veränderbar ist.7. The device according to claim 6, characterized in that a plurality of adjusting screws (7) are provided along the nozzle gap length, through which the intensity profile of the compressed air blow-off along the gap length can be changed. 8. Vorrichtung nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß eine Druckluftregelung vorgesehen ist, derart, daß durch die Signale der die Schichtdicke des Metallbandes messenden Sensoren (25), die dem Rechner (16) zugeleitet werden, mittels der mit dem Ausgang des Rechners (16) verbundenen Regelventile (26) für die Kantenabblasluft bzw. Regelventile (27) für die Abblasdüsenluft die den Kantendüsen (21) bzw. den Abblasdüsen (1) zugeführten Mengenanteile der Druckluft einstellbar sind.8. Device according to one of claims 1 to 7, characterized in that a compressed air control is provided, such that the layer thickness of the metal strip is measured by the signals Sensors (25) which are fed to the computer (16), by means of the control valves (26) for the edge blow-off air connected to the output of the computer (16) or control valves (27) for the blow-off nozzle air which are connected to the edge nozzles (21) and the Blow-off nozzles (1) of the quantity of compressed air supplied can be adjusted. 9. Vorrichtung nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, daß im gesamten Bereich der Länge der Abblasdüse (1) zwischen dem Düsenspalt (2) und der Stellschraube (7) ein Filterstück (8) aus einem porösen Material vorgesehen ist.9. Device according to one of the preceding claims, characterized in that a filter piece (8) made of a porous material is provided in the entire region of the length of the blow-off nozzle (1) between the nozzle gap (2) and the adjusting screw (7). 10. Vorrichtung nach Anspruch 9, dadurch gekennzeichnet, daß das Filterstück (8) aus Sinterbronze mit einer Porengröße von mindestens 80 µm besteht.10. The device according to claim 9, characterized in that the filter piece (8) consists of sintered bronze with a pore size of at least 80 microns. 11. Vorrichtung nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, daß die Abblasdüse (1) mit einem die Düse in dem nicht durch das Metallband abgedeckten Bereich des Außenraumes abschirmenden Schutzblech (28) umgeben ist.11. Device according to one of the preceding claims, characterized in that the blow-off nozzle (1) is surrounded with a protective plate (28) shielding the nozzle in the region of the outer space not covered by the metal strip. 12. Vorrichtung nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, daß die dem Beschichtungsmittelbad (31) zugewandten Teile der Abblasdüse (1) durch ein Hitzeschild (29, 30) verkleidet sind.12. Device according to one of the preceding claims, characterized in that the parts of the blow-off nozzle (1) facing the coating agent bath (31) are covered by a heat shield (29, 30). 13. Verfahren zum Abblasen von überflüssigem Beschichtungsmaterial beim kontinuierlichen Beschichten von Metallband (33), insbesondere beim Verzinken von Stahlband, bei dem jede Seite des Bandes von jeweils einer druckluftbeaufschlagten Abblasdüse (1) abgeblasen wird, wobei die Länge des von gegeneinander verstellbaren Düsenlippen (4) gebildeten Düsenspaltes (2) größer ist als die Breite des Metallbandes, dadurch gekennzeichnet, daß der nicht zum Abblasen erforderliche Bereich des Düsenspaltes (2) durch ein von der Abblasdüse (1) geführtes Abdeckelement (11) abgedeckt wird.13.Method for blowing off superfluous coating material during the continuous coating of metal strip (33), in particular when galvanizing steel strip, in which each side of the strip is blown off by a blow-off nozzle (1) pressurized by compressed air, the length of the nozzle lips (4 ) formed nozzle gap (2) is greater than the width of the metal strip, characterized in that the area of the nozzle gap (2) not required for blowing off is covered by a cover element (11) guided by the blow-off nozzle (1).
EP87108473A 1986-06-12 1987-06-11 Blow-off device for the continuous two-sided coating of strip metal Expired - Lifetime EP0249234B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87108473T ATE45390T1 (en) 1986-06-12 1987-06-11 BLOW-OFF DEVICE FOR CONTINUOUS DOUBLE-SIDED COATING OF METAL STRIP.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3619805 1986-06-12
DE3619805 1986-06-12

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AT (1) ATE45390T1 (en)
DE (1) DE3760425D1 (en)
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EP0278373A2 (en) * 1987-02-11 1988-08-17 Unitas S.A. Gas-wiping nozzle for continuously moving surfaces
WO1992002656A1 (en) * 1990-07-31 1992-02-20 Thyssen Stahl Ag Device for blowing off excess coating material when coating metal strip
DE4208558C1 (en) * 1992-03-18 1993-03-11 Duma Konstruktionsbuero, 4100 Duisburg, De Removing excess coating material from steel strip - with compressed air from nozzle having gap formed by nozzle lips partly coverable by guide strip and using deflecting element for lateral deflection of air jet
DE4223343C1 (en) * 1992-07-16 1994-03-17 Duma Masch Anlagenbau Blow off device
DE4300868C1 (en) * 1993-01-15 1994-03-17 Duma Masch Anlagenbau Coating device
DE4306394C1 (en) * 1993-03-02 1994-04-21 Duma Masch Anlagenbau Blow-off device and method for blowing off excess coating material
WO1998032890A1 (en) * 1997-01-22 1998-07-30 Industrial Automation Services Pty. Ltd. Coating thickness control
EP2140944A1 (en) * 2008-07-03 2010-01-06 Linde AG Adjustable baffles for gas wiping
EP2631012A1 (en) 2012-02-21 2013-08-28 Cockerill Maintenance & Ingenierie S.A. System for reducing the wiping gas consumption in an air knife
JP2015059245A (en) * 2013-09-19 2015-03-30 真人 稗田 Plating film thickness control device
CN110158013A (en) * 2019-06-22 2019-08-23 徐州华正铸业有限公司 A kind of spray zinc rifle regulating device for spraying zinc machine

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Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0278373A2 (en) * 1987-02-11 1988-08-17 Unitas S.A. Gas-wiping nozzle for continuously moving surfaces
EP0278373A3 (en) * 1987-02-11 1989-03-15 Unitas S.A. Gas-wiping nozzle for continuously moving surfaces
WO1992002656A1 (en) * 1990-07-31 1992-02-20 Thyssen Stahl Ag Device for blowing off excess coating material when coating metal strip
US5346551A (en) * 1990-07-31 1994-09-13 Thyssen Stahl Ag Device for blowing off coating material in the coating of metal bands
DE4208558C1 (en) * 1992-03-18 1993-03-11 Duma Konstruktionsbuero, 4100 Duisburg, De Removing excess coating material from steel strip - with compressed air from nozzle having gap formed by nozzle lips partly coverable by guide strip and using deflecting element for lateral deflection of air jet
DE4223343C1 (en) * 1992-07-16 1994-03-17 Duma Masch Anlagenbau Blow off device
DE4300868C1 (en) * 1993-01-15 1994-03-17 Duma Masch Anlagenbau Coating device
DE4306394C1 (en) * 1993-03-02 1994-04-21 Duma Masch Anlagenbau Blow-off device and method for blowing off excess coating material
WO1998032890A1 (en) * 1997-01-22 1998-07-30 Industrial Automation Services Pty. Ltd. Coating thickness control
GB2336377A (en) * 1997-01-22 1999-10-20 Ind Automation Serv Pty Ltd Coating thickness control
US6199301B1 (en) 1997-01-22 2001-03-13 Industrial Automation Services Pty. Ltd. Coating thickness control
GB2336377B (en) * 1997-01-22 2001-07-25 Ind Automation Serv Pty Ltd Coating thickness control
EP2140944A1 (en) * 2008-07-03 2010-01-06 Linde AG Adjustable baffles for gas wiping
EP2631012A1 (en) 2012-02-21 2013-08-28 Cockerill Maintenance & Ingenierie S.A. System for reducing the wiping gas consumption in an air knife
WO2013124196A1 (en) 2012-02-21 2013-08-29 Cockerill Maintenance & Ingenierie S.A. System for reducing the wiping gas consumption in an air knife
US9217194B2 (en) 2012-02-21 2015-12-22 Cockerill Maintenance & Ingénierie S.A. System for reducing the wiping gas consumption in an air knife
RU2615392C2 (en) * 2012-02-21 2017-04-04 Кокрий Ментенанс Эт Энженьери С.А. System to reduce gas consumption push-ups in air knife
JP2015059245A (en) * 2013-09-19 2015-03-30 真人 稗田 Plating film thickness control device
CN110158013A (en) * 2019-06-22 2019-08-23 徐州华正铸业有限公司 A kind of spray zinc rifle regulating device for spraying zinc machine

Also Published As

Publication number Publication date
ES2009820B3 (en) 1989-10-16
ATE45390T1 (en) 1989-08-15
EP0249234B1 (en) 1989-08-09
DE3760425D1 (en) 1989-09-14
EP0249234B2 (en) 1994-08-17
ES2009820T5 (en) 1995-08-16

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