EP0260533B1 - Method and apparatus for removing a liquid coating from steel strip - Google Patents
Method and apparatus for removing a liquid coating from steel strip Download PDFInfo
- Publication number
- EP0260533B1 EP0260533B1 EP87112839A EP87112839A EP0260533B1 EP 0260533 B1 EP0260533 B1 EP 0260533B1 EP 87112839 A EP87112839 A EP 87112839A EP 87112839 A EP87112839 A EP 87112839A EP 0260533 B1 EP0260533 B1 EP 0260533B1
- Authority
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- European Patent Office
- Prior art keywords
- gas
- nozzles
- bath
- sheet material
- sheet
- 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.)
- Expired - Lifetime
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- 239000011248 coating agent Substances 0.000 title claims abstract description 21
- 238000000576 coating method Methods 0.000 title claims abstract description 21
- 238000000034 method Methods 0.000 title claims description 14
- 229910000831 Steel Inorganic materials 0.000 title 1
- 239000007788 liquid Substances 0.000 title 1
- 239000010959 steel Substances 0.000 title 1
- 239000000463 material Substances 0.000 claims abstract description 25
- 238000005246 galvanizing Methods 0.000 claims abstract description 8
- 229910018503 SF6 Inorganic materials 0.000 claims abstract description 7
- SFZCNBIFKDRMGX-UHFFFAOYSA-N sulfur hexafluoride Chemical compound FS(F)(F)(F)(F)F SFZCNBIFKDRMGX-UHFFFAOYSA-N 0.000 claims abstract description 7
- 229960000909 sulfur hexafluoride Drugs 0.000 claims abstract description 7
- 239000000203 mixture Substances 0.000 claims abstract description 5
- 238000009434 installation Methods 0.000 claims abstract description 4
- 239000007789 gas Substances 0.000 claims description 35
- 239000000155 melt Substances 0.000 claims description 15
- 239000011261 inert gas Substances 0.000 claims description 4
- 238000005422 blasting Methods 0.000 claims 1
- 239000002184 metal Substances 0.000 abstract description 10
- 229910052751 metal Inorganic materials 0.000 abstract description 10
- 238000007664 blowing Methods 0.000 description 12
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 11
- 229910052757 nitrogen Inorganic materials 0.000 description 4
- 238000011084 recovery Methods 0.000 description 4
- 229910001873 dinitrogen Inorganic materials 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 229910052725 zinc Inorganic materials 0.000 description 2
- 239000011701 zinc Substances 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000003618 dip coating Methods 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 210000001331 nose Anatomy 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
Images
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 method for stripping sheet metal coated in a galvanizing or hot-coating system with the features of the preamble of patent claim 1.
- the invention also relates to a device for carrying out this method with the features of the preamble of patent claim 2.
- the surfaces of the coated sheet can be blown off with air.
- this leads to oxidation or other influence on the coating material, which in turn can lead to defects on the coated surfaces.
- the move has been made to use inert gas such as nitrogen gas to blow off the coated sheet metal surfaces.
- inert gas such as nitrogen gas
- nitrogen is used in the process known from DE-OS-30 14 651, so that part of it Nitrogen can be reused via the gas outlet in the housing, an equal part of the nitrogen, that is to say about 50%, but cannot be reused, since after blowing the sheet metal material there is insufficient separation of the related nitrogen and the air in the container comes.
- EP-A-0 122 856 a device is known in which a sheet material is also blown by means of blow-off nozzles, but here two pairs of blow-off nozzles are used and gas recirculation is to be made possible via gas return connections arranged in the housing surrounding the blow-off nozzles, which, however, are arranged above the blow-off nozzles, so that in the case of EP-A -0 122 856 known device, the efficiency of gas recirculation is not sufficiently high.
- the invention has for its object to provide a method for stripping coated in a galvanizing or hot-dip coating system and a device for performing this method, which on the one hand significantly increases the efficiency in the recovery of the gas necessary for blowing and on the other hand a device for Provides implementation of this method, in which a constant control of the melt level can largely be dispensed with.
- an inert gas By blowing off the sheet with sulfur hexafluoride or a gas mixture containing this gas, an inert gas is chosen which is clear, that is to say several times heavier than air, so that due to its own weight it falls more or less vertically downwards. Therefore, it can be caught relatively easily and one can be used again, i.e. it can be recycled.
- inert gases such as nitrogen gas
- nitrogen gas which have hitherto been used to blow off coated sheet metal surfaces
- the recovery of such gases is therefore poor and only possible incompletely.
- gases cannot adequately or completely shield the surface of the melt of the coating material in the bath of a galvanizing or hot-coating system against the effect of air (oxygen).
- a gas such as sulfur hexafluoride is about five times heavier than nitrogen gas and much heavier than air, so that it separates itself from air precisely on the basis of its own weight and, accordingly, can also be aspirated and reused. In the border area between this gas and air, there are no zones in which a mixture between air and this gas takes place and oxidation is possible. In addition, the relatively heavy sulfur hexafluoride does not rise to the top and therefore only has to be ensured for the recovery that it can sink downwards in a defined zone or a defined space, from where it can be removed for reuse and thus recovered .
- the shell contains an extension portion within its side and end walls and the shell is provided on the lower edge with buoyancy or floating bodies that come into contact with the melt in the bath, is achieved that the shell with the help of the bottom edge of buoyancy or floating bodies stands floating on the melt in the bath, so that any fluctuations in the melt level are automatically compensated for, this effect being reinforced or promoted in a special way by the corresponding extension sections, which make it possible for the shell to be permanently installed on its top and only the extension section, together with the part of the casing located underneath, adapts to the fluctuations in the melt level.
- extension section is designed in the manner of a bellows, a configuration of the extension section is chosen which is characterized by high flexibility, so that the lower part can float on the melt in a particularly advantageous manner by means of the buoyancy or floating bodies, while the upper part the envelope is attached to a fixed point.
- the position of the casing in the device can thereby be fixed precisely without the adaptability to the height of the melting level being impaired.
- a zinc melt (2) In a bath tank (1) of a galvanizing plant, not shown in detail, there is a zinc melt (2), the level (3) of which can be varied within certain limits in accordance with the consumption of zinc material and the amount of refill.
- At least one deflection roller (4) is immersed in the melt, through which strip material (5) is guided, which sheet material can be and which runs through the device in the direction of an arrow (6) in a manner not shown. Further guide elements for the strip material (5) are omitted for the sake of simplifying the illustration.
- blowing nozzles (7 and 8) of known design opposite to each other, to which a blower (9) is connected via lines (10 and 11) to these blowing nozzles (7 and 8) gas, which is heavier than Air is, for example sulfur hexafluoride, under pressure.
- Air is, for example sulfur hexafluoride
- This gas is blown out of the facing slot-shaped nozzle openings (12 and 13) so that it forms an approximately horizontal curtain through which the strip material (5) passes.
- excess coating material which has been taken from the melt (2) of the bath container (1) is wiped off the surface of the strip material (5).
- blowing nozzles (7 and 8) are accommodated in a box-like casing (14), the upper wall (15) of which contains a relatively wide slot-like opening (16) through which the strip material (5) can exit.
- a circumferential floating body (21) which supports the side wall sections (17a and 18a) on the melt (2) and submerges them somewhat under their mirror (3), so that it forms a circumferential seal, which prevents the escape of gas blown into the casing (14) by the blowing nozzles (7 and 8) under the lower edge of the casing.
- connection piece (22) to which a line (23) is connected which leads to the suction side of the blower (9).
- the blower (9) thus sucks the gas used to feed the blowing nozzles (7 and 8) from the lower part of the casing (14). Since practically no gas is lost, little additional gas is needed to feed the blowing nozzles (7 and 8).
- the gas or gas mixture lying on the surface of the molten metal which is heavier than air, protects the melt against corrosion. But it is also heat-insulating and offers sound insulation.
- Carbon dioxide for example, is suitable as a mixing component for sulfur hexafluoride.
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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 With Molten Metal (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
Description
Die Erfindung betrifft ein Verfahren zum Abstreifen von in einer Verzinkungs- oder Feuerbeschichtungsanlage beschichteten Blech mit den Merkmalen des Oberbegriffes des Patentanspruches 1. Außerdem betrifft die Erfindung eine Vorrichtung zum Durchführen dieses Verfahrens mit den Merkmalen des Oberbegriffes des Patentanspruches 2.The invention relates to a method for stripping sheet metal coated in a galvanizing or hot-coating system with the features of the preamble of
Es ist bekannt, die Oberflächen von Blech und insbesondere bandförmigen Blechmaterial, das in einer Verzinkungs- oder Feuerbeschichtungsanlage mit schmelzflüssigem Beschichtungsmaterial beschichtet worden ist, mit einem vorhangartigen dünnen Gasstrahl abzublasen, um überschüssiges Beschichtungsmaterial abzustreifen und zu verhindern, daß sich auf den Oberflächen des Bleches Nasen oder Streifen aus dem Beschichtungsmaterial bilden und dadurch nicht nur unschöne Oberlächen entstehen, sondern die Beschichtung auch an unterschiedlichen Stellen unnötig dick wird, was einen unnötig hohen Verbrauch an Beschichtungsmaterial bedeutet.It is known to blow off the surfaces of sheet metal and, in particular, strip-shaped sheet metal material which has been coated with molten coating material in a galvanizing or hot-coating installation, with a curtain-like thin gas jet in order to strip off excess coating material and to prevent noses from forming on the surfaces of the sheet metal or form strips from the coating material and this not only creates unsightly surfaces, but the coating also becomes unnecessarily thick at different points, which means an unnecessarily high consumption of coating material.
Man kann die Oberflächen des beschichteten Bleches mit Luft abblasen. Dies führt jedoch zu einer Oxidation oder sonstigen Beeinflussung des Beschichtungsmaterial, was wiederum Fehler an den beschichteten Oberflächen zur Folge haben kann. Deshalb ist man dazu übergegangen, zum Abblasen der beschichteten Blechoberflächen inertes Gas wie Stickstoffgas zu verwenden. Dadurch läßt sich zwar das Oxidationsproblem einigermaßen befriedigend vermeiden, jedoch ist der Gasverbrauch verhältnismäßig hoch, was zu unerwünschten Kostensteigerungen führt.The surfaces of the coated sheet can be blown off with air. However, this leads to oxidation or other influence on the coating material, which in turn can lead to defects on the coated surfaces. For this reason, the move has been made to use inert gas such as nitrogen gas to blow off the coated sheet metal surfaces. Although the oxidation problem can be avoided to some extent satisfactorily, the gas consumption is relatively high, which leads to undesirable cost increases.
Aus der EP-A-0 038 036 ist ein Verfahren und eine Vorrichtung bekannt, bei der zur Dickenregulierung der Beschichtung von in einer Schmelze beschichteten langgestreckten Gegenständen wie z.B. Blechen, Bändern oder Drähten diese unter Verwendung von schweren Gasen mittels Abblasdüsen bedüst werden, wobei es jedoch zu keiner Rückgewinnung der dabei verwandten Gase kommt, so daß der beim Betreiben dieses Verfahrens notwendige Gasverbrauch verhältnismäßig hoch ist und somit einhergeht mit unerwünscht hohen Kosten.From EP-A-0 038 036 a method and a device is known in which for regulating the thickness of the coating of elongated objects coated in a melt, such as e.g. Sheets, strips or wires are sprayed on using heavy gases by means of blow-off nozzles, but there is no recovery of the gases involved, so that the gas consumption required in the operation of this method is relatively high and is therefore accompanied by undesirably high costs.
Bei einem aus der DE-OS-30 14 651 bekannten Verfahren und einer aus der gleichen Druckschrift bekannten Einrichtung zur Oberflächenbehandlung eines im Durchlauf-Schmelztauchverfahren beidseitig mit einem Metall überzogenen Eisenbandes wird versucht, diesem erhöhten Gasverbrauch dadurch zu begegnen, daß das Abblasen des Metalls innerhalb eines Gehäuses vorgenommen wird, wobei das Gehäuse mit seiner Unterseite in die Schmelze eintaucht und unterhalb der Strahldüsen, das heißt zwischen den Strahldüsen und der Schmelzoberfläche in der Gehäusewandung ein Gasauslaß vorgesehen ist, der der Rückführung des zum Abblasen benutzten Gases dient.In a method known from DE-OS-30 14 651 and a device known from the same publication for surface treatment of an iron strip coated on both sides with a metal in a continuous hot-dip process, attempts are made to counteract this increased gas consumption by blowing off the metal within a housing is made, the housing dips into the melt with its underside and a gas outlet is provided below the jet nozzles, that is between the jet nozzles and the melt surface in the housing wall, which serves to return the gas used for blowing off.
Zum Abblasen wird bei dem aus der DE-OS-30 14 651 bekannten Verfahren Stickstoff verwandt, so daß zwar ein Teil dieses Stickstoffes über den Gasauslaß im Gehäuse einer erneuten Verwendung zugeführt werden kann, ein gleich großer Teil des Stickstoffs, das heißt etwa 50 %, jedoch keiner erneuten Wiederverwendung zugeführt werden kann, da es nach der Beblasung des Blechmaterials nicht zu einer ausreichenden Trennung des verwandten Stickstoffs und der im Behältnis vorhandenen Luft kommt.For blowing off, nitrogen is used in the process known from DE-OS-30 14 651, so that part of it Nitrogen can be reused via the gas outlet in the housing, an equal part of the nitrogen, that is to say about 50%, but cannot be reused, since after blowing the sheet metal material there is insufficient separation of the related nitrogen and the air in the container comes.
Aus der EP-A-0 122 856 ist eine Vorrichtung bekannt, bei der ebenfalls ein Blechmaterial mittels Abblasdüsen beblasen wird, wobei hier jedoch zwei Paar Abblasdüsen verwandt werden und eine Gasrückführung ermöglicht werden soll über in dem, die Abblasdüsen umgebenden Gehäuse angeordneten Gasrückführanschlüssen, die jedoch oberhalb der Abblasdüsen angeordnet sind, so daß bei der aus der EP-A-0 122 856 bekannten Vorrichtung die Effizienz der Gasrückführung nicht ausreichend hoch ist.From EP-A-0 122 856 a device is known in which a sheet material is also blown by means of blow-off nozzles, but here two pairs of blow-off nozzles are used and gas recirculation is to be made possible via gas return connections arranged in the housing surrounding the blow-off nozzles, which, however, are arranged above the blow-off nozzles, so that in the case of EP-A -0 122 856 known device, the efficiency of gas recirculation is not sufficiently high.
Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren zum Abstreifen von in einer Verzinkungs- oder Feuerbeschichtungsanlage beschichteten Blech und eine Vorrichtung zur Durchführung dieses Verfahrens bereitzustellen, das zum einen den Wirkungsgrad bei der Rückgewinnung des zur Beblasung notwendigen Gases erheblich erhöht und zum anderen eine Vorrichtung zur Durchführung dieses Verfahrens bereitstellt, bei der auf eine ständige Kontrolle der Schmelzspiegelhöhe weitgehend verzichtet werden kann.The invention has for its object to provide a method for stripping coated in a galvanizing or hot-dip coating system and a device for performing this method, which on the one hand significantly increases the efficiency in the recovery of the gas necessary for blowing and on the other hand a device for Provides implementation of this method, in which a constant control of the melt level can largely be dispensed with.
Diese Aufgabe wird bei einem Verfahren der eingangs genannten Gattung mit den Merkmalen des kennzeichnenden Teiles des Patentanspruches 1 gelöst. Desweiteren wird diese Aufgabe bei einer Vorrichtung der eingangs genannten Gattung mit den Merkmalen des kennzeichnenden Teiles des Patentanspruches 2 gelöst. Eine vorteilhafte Ausgestaltung der Erfindung ist Gegenstand des Anspruches 3.This object is achieved in a method of the type mentioned at the outset with the features of the characterizing part of
Dadurch, daß das Blech mit Schwefelhexafluorid oder einem dieses Gas enthaltenden Gasgemisch abgeblasen wird, wird ein inertes Gas gewählt, welches deutlich, das heißt, mehrfach schwerer als Luft ist, so daß es aufgrund seines Eigengewichts mehr oder weniger senkrecht nach unten fällt. Daher kann es verhältnismäßig leicht aufgefangen und einer erneuten Verwendung wieder zugeführt werden, das heißt es kann in einem Kreislauf geführt werden.By blowing off the sheet with sulfur hexafluoride or a gas mixture containing this gas, an inert gas is chosen which is clear, that is to say several times heavier than air, so that due to its own weight it falls more or less vertically downwards. Therefore, it can be caught relatively easily and one can be used again, i.e. it can be recycled.
Die bisher zum Abblasen von beschichteten Blechoberflächen verwandten inerten Gase wie Stickstoffgas sind nur verhältnismäßig wenig schwerer als Luft und trennen sich aufgrund ihres Eigengewichtes nicht ohne weiteres und genau genug von Luft. Daher ist eine Rückgewinnung derartiger Gase schlecht und auch nur unvollständig möglich. Auch können derartige Gase die Oberfläche der im Bad einer Verzinkungs- oder Feuerbeschichtungsanlage befindlichen Schmelze des Beschichtungsmaterials nicht ausreichend bzw. vollständig genug gegen die Einwirkung von Luft (Sauerstoff) abschirmen.The inert gases, such as nitrogen gas, which have hitherto been used to blow off coated sheet metal surfaces, are only relatively little heavier than air and, because of their own weight, do not separate easily and precisely from air. The recovery of such gases is therefore poor and only possible incompletely. Also, such gases cannot adequately or completely shield the surface of the melt of the coating material in the bath of a galvanizing or hot-coating system against the effect of air (oxygen).
Ein Gas wie Schwefelhexafluorid ist etwa fünfmal schwerer als Stickstoffgas und noch viel schwerer als Luft, so daß es sich allein aufgrund seines Eigengewichtes genau von Luft trennt und dementsprechend auch gezielt abgesaugt und einer erneuten Verwendung zugeführt werden kann. Es entstehen im Grenzbereich zwischen diesem Gas und Luft keine Zonen, in denen eine Vermischung zwischen Luft und diesem Gas stattfindet und eine Oxidation möglich ist. Hinzu kommt, daß das verhältnismäßig schwere Schwefelhexafluorid nicht nach oben steigt und daher für die Rückgewinnung lediglich sichergestellt sein muß, daß es in einer definierten Zone oder einem definierten Raum nach unten sinken kann, von wo es sich für eine erneute Verwendung abführen und somit rückgewinnen läßt.A gas such as sulfur hexafluoride is about five times heavier than nitrogen gas and much heavier than air, so that it separates itself from air precisely on the basis of its own weight and, accordingly, can also be aspirated and reused. In the border area between this gas and air, there are no zones in which a mixture between air and this gas takes place and oxidation is possible. In addition, the relatively heavy sulfur hexafluoride does not rise to the top and therefore only has to be ensured for the recovery that it can sink downwards in a defined zone or a defined space, from where it can be removed for reuse and thus recovered .
Dadurch, daß die Hülle innerhalb ihrer Seiten- und Stirnwände einen Verlängerungsabschnitt enthält und die Hülle an der Unterkante mit Auftriebs- oder Schwimmkörpern, die mit der im Bad befindlichen Schmelze in Kontakt treten, versehen ist, wird erreicht, daß die Hülle mit Hilfe der an der Unterkante befindlichen Auftriebs- oder Schwimmkörpern auf der im Bad befindlichen Schmelze schwimmend aufsteht, so daß dementsprechend eventuelle Schwankungen in der Schmelzspiegelhöhe selbsttätig ausgeglichen werden, wobei dieser Effekt noch in besonderer Weise durch die entsprechenden Verlängerungsabschnitte verstärkt bzw. begünstigt wird, die es ermöglichen, daß die Hülle an ihrer Oberseite fest installiert ist und lediglich der Verlängerungsabschnitt nebst des darunter befindlichen Teiles der Hülle sich den Schwankungen der Schmelzspiegelhöhe anpaßt.Characterized in that the shell contains an extension portion within its side and end walls and the shell is provided on the lower edge with buoyancy or floating bodies that come into contact with the melt in the bath, is achieved that the shell with the help of the bottom edge of buoyancy or floating bodies stands floating on the melt in the bath, so that any fluctuations in the melt level are automatically compensated for, this effect being reinforced or promoted in a special way by the corresponding extension sections, which make it possible for the shell to be permanently installed on its top and only the extension section, together with the part of the casing located underneath, adapts to the fluctuations in the melt level.
Ist der Verlängerungsabschnitt nach Art eines Faltenbalgs ausgestaltet, so ist damit eine Ausgestaltung des Verlängerungsabschnitts gewählt, die sich durch hohe Flexibilität auszeichnet, so daß der untere Teil in besonders günstiger Weise mittels der Auftriebs- oder Schwimmkörper auf der Schmelze schwimmen kann, während der obere Teil der Hülle an einem Festpunkt angebracht ist. Die Lage der Hülle in der Vorrichtung läßt sich dadurch genau fixieren, ohne daß die Anpassbarkeit an die Höhe des Schmelzspiegels beeinträchtigt würde.If the extension section is designed in the manner of a bellows, a configuration of the extension section is chosen which is characterized by high flexibility, so that the lower part can float on the melt in a particularly advantageous manner by means of the buoyancy or floating bodies, while the upper part the envelope is attached to a fixed point. The position of the casing in the device can thereby be fixed precisely without the adaptability to the height of the melting level being impaired.
In der Zeichnung ist schematisch in Seitenansicht eine Ausführungsform der erfindungsgemäßen Vorrichtung zum Absteifen von überschüssigem Beschichtungsmaterial von der Oberfläche von durch diese Vorrichtung hindurchlaufendem bandförmigen Blech dargestellt.In the drawing, an embodiment of the device according to the invention for stiffening excess coating material from the surface of strip-shaped sheet metal passing through this device is shown schematically in side view.
In einem Badbehälter (1) einer nicht näher dargestellten Verzinkungsanlage befindet sich eine Zinkschmelze (2), deren Spiegel (3) entsprechend dem Verbrauch von Zinkmaterial und der Nachfüllmenge in seiner Höhe innerhalb gewisser Grenzen variabel ist.In a bath tank (1) of a galvanizing plant, not shown in detail, there is a zinc melt (2), the level (3) of which can be varied within certain limits in accordance with the consumption of zinc material and the amount of refill.
In die Schmelze eingetaucht ist zumindest eine Umlenkrolle (4) gelagert, über die Bandmaterial (5) geführt ist, welches Blechmaterial sein kann und welches in Richtung eines Pfeiles (6) in nicht näher dargestellter Weise durch die Vorrichtung hindurchläuft. Weitere Führungselemente für das Bandmaterial (5) sind aus Gründen der Vereinfachung der Darstellung weggelassen.At least one deflection roller (4) is immersed in the melt, through which strip material (5) is guided, which sheet material can be and which runs through the device in the direction of an arrow (6) in a manner not shown. Further guide elements for the strip material (5) are omitted for the sake of simplifying the illustration.
Oberhalb des Badbehälters (1) befinden sich einander gegenüberliegend zwei Blasdüsen (7 und 8) bekannter Ausführung, an die ein Gebläse (9) über Leitungen (10 und 11) angeschlossen ist, um diesen Blasdüsen (7 und 8) Gas, das schwerer als Luft ist, beispielsweise Schwefelhexafluorid, unter Druck zuführen. Dieses Gas wird aus den einander zugewandten schlitzförmigen Düsenöffnungen (12 und 13) ausgeblasen, so daß es einen etwa horizontalen Vorhang bildet, durch den das Bandmaterial (5) hindurchtritt. Dadurch wird überschüssiges Beschichtungsmaterial, das aus der Schmelze (2) des Badbehälters (1) mitgenommen worden ist, von der Oberfläche des Bandmaterials (5) abgestreift.Above the bath tank (1) there are two blowing nozzles (7 and 8) of known design opposite to each other, to which a blower (9) is connected via lines (10 and 11) to these blowing nozzles (7 and 8) gas, which is heavier than Air is, for example sulfur hexafluoride, under pressure. This gas is blown out of the facing slot-shaped nozzle openings (12 and 13) so that it forms an approximately horizontal curtain through which the strip material (5) passes. As a result, excess coating material which has been taken from the melt (2) of the bath container (1) is wiped off the surface of the strip material (5).
Die Blasdüsen (7 und 8) sind in einer kastenartigen Hülle (14) untergebracht, deren obere Wand (15) eine verhältnismäßig breite schlitzartige Öffnung (16) enthält, durch die das Bandmaterial (5) austreten kann.The blowing nozzles (7 and 8) are accommodated in a box-like casing (14), the upper wall (15) of which contains a relatively wide slot-like opening (16) through which the strip material (5) can exit.
Die Seitenwände (17 und 18) enthalten ebenso wie die Stirnwände, was in der Zeichnung nicht im einzelnen dargestellt ist, faltenbalgartige Expansions- oder Verlängerungsabschnitte (19 und 20), die es ermöglichen, daß sich die unteren Abschnitte (17a und 18a) der Wände in senkrechter Richtung relativ zu dem oberen Teil der Hülle (14) oder umgekehrt bewegen können. Am unteren Rand der unteren Abschnitte (17a und 18a) der Seitenwände befindet sich ein umlaufender Schwimmkörper (21), der die Seitenwandabschnitte (17a und 18a) auf der Schmelze (2) abstützt und etwas unter deren Spiegel (3) untertaucht, so daß er eine umlaufende Dichtung bildet, welche ein Entweichen von in die Hülle (14) durch die Blasdüsen (7 und 8) eingeblasenem Gas unter dem unteren Rand der Hülle verhindert.The side walls (17 and 18) as well as the end walls, which is not shown in detail in the drawing, contain bellows-like expansion or extension sections (19 and 20) which allow the lower sections (17a and 18a) of the walls to be located can move in the vertical direction relative to the upper part of the shell (14) or vice versa. At the lower edge of the lower sections (17a and 18a) of the side walls there is a circumferential floating body (21) which supports the side wall sections (17a and 18a) on the melt (2) and submerges them somewhat under their mirror (3), so that it forms a circumferential seal, which prevents the escape of gas blown into the casing (14) by the blowing nozzles (7 and 8) under the lower edge of the casing.
In dem unteren Abschnitt (18a) der Seitenwand (18) befindet sich ein Anschlußstutzen (22), an den eine Leitung (23) angeschlossen ist, die zur Saugseite des Gebläses (9) führt. Somit saugt das Gebläse (9) das zum Beschicken der Blasdüsen (7 und 8) benutzte Gas aus dem unteren Teil der Hülle (14) ab. Da praktisch kein Gas verloren geht, braucht allenfalls wenig zusätzliches Gas für die Beschickung der Blasdüsen (7 und 8) zugeführt werden.In the lower section (18a) of the side wall (18) there is a connection piece (22) to which a line (23) is connected which leads to the suction side of the blower (9). The blower (9) thus sucks the gas used to feed the blowing nozzles (7 and 8) from the lower part of the casing (14). Since practically no gas is lost, little additional gas is needed to feed the blowing nozzles (7 and 8).
Das auf der Oberfläche der Metallschmelze liegende Gas oder Gasgemisch, das schwerer als Luft ist, schützt die Schmelze gegen Korrosion. Es ist aber auch wärmeisolierend und bietet einen Schallschutz.The gas or gas mixture lying on the surface of the molten metal, which is heavier than air, protects the melt against corrosion. But it is also heat-insulating and offers sound insulation.
Als Mischkomponente für Schwefelhexafluorid ist beispielsweise Kohlendioxyd geeignet.Carbon dioxide, for example, is suitable as a mixing component for sulfur hexafluoride.
Claims (3)
- Method of stripping sheet material coated in a galvanizing or refractory coating installation, directly after the coated sheet has left a bath of molten coating material, both sides of the sheet being blasted with a curtain-like thin gas stream formed of an inert gas which is significantly heavier than air and the gas being at least partially conducted in a circuit, characterised in that the sheet material is blasted with sulfur hexafluoride or a gas mixture containing this gas.
- Apparatus for stripping excess coating material from the surface of sheet material (5) which has passed through a bath (2) of molten coating material in a galvanising or refractory coating installation, with two mutually opposed blast nozzles (7,8) arranged closely above the bath (2), the nozzles forming a curtain-like thin gas stream for blasting both sides of the strip-shaped sheet material conducted between them, the two gas nozzles (7,8) being arranged in a box-like casing (14) of which the side and end walls (17,18) extend at least to the surface (3) of the bath (2), containing at its upper face (15) an opening (16) for the emerging sheet material (5), and having below the blast nozzles (7,8) arranged in it a connection (22) for conducting away the gas blown from the nozzles (7,8), for carrying out the method according to Claim 1, characterised in that the casing (14) contains within its side and end walls (17,18) an extension portion (19,20) and the casing (14) is provided at its lower edge with supporting or float bodies (21) which come into contact with the melt (2) present in the container (1).
- Apparatus according to Claim 2 characterised in that the extension portion (19,20) is formed in the shape of a bellows.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT87112839T ATE73176T1 (en) | 1986-09-19 | 1987-09-03 | METHOD AND APPARATUS FOR STRIPING METAL COATED METAL SHEET METAL. |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3631893 | 1986-09-19 | ||
| DE19863631893 DE3631893A1 (en) | 1986-09-19 | 1986-09-19 | METHOD AND DEVICE FOR STRIPING SHEET COATED WITH MELT LIQUID MATERIAL |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0260533A2 EP0260533A2 (en) | 1988-03-23 |
| EP0260533A3 EP0260533A3 (en) | 1989-03-15 |
| EP0260533B1 true EP0260533B1 (en) | 1992-03-04 |
Family
ID=6309928
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP87112839A Expired - Lifetime EP0260533B1 (en) | 1986-09-19 | 1987-09-03 | Method and apparatus for removing a liquid coating from steel strip |
Country Status (8)
| Country | Link |
|---|---|
| US (1) | US4862825A (en) |
| EP (1) | EP0260533B1 (en) |
| JP (1) | JPS6386854A (en) |
| AT (1) | ATE73176T1 (en) |
| AU (1) | AU600019B2 (en) |
| DE (2) | DE3631893A1 (en) |
| ES (1) | ES2030406T3 (en) |
| GR (1) | GR3004037T3 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101222346B1 (en) | 2010-12-13 | 2013-01-14 | 동부제철 주식회사 | apparatus to produce galvanizing steel sheets |
Families Citing this family (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4010801C2 (en) * | 1990-04-04 | 1998-07-23 | Unitas Sa | Device for stripping running tape material |
| US5491036A (en) * | 1992-03-27 | 1996-02-13 | The Louis Berkman Company | Coated strip |
| US6861159B2 (en) | 1992-03-27 | 2005-03-01 | The Louis Berkman Company | Corrosion-resistant coated copper and method for making the same |
| US6652990B2 (en) | 1992-03-27 | 2003-11-25 | The Louis Berkman Company | Corrosion-resistant coated metal and method for making the same |
| US5597656A (en) * | 1993-04-05 | 1997-01-28 | The Louis Berkman Company | Coated metal strip |
| US6080497A (en) * | 1992-03-27 | 2000-06-27 | The Louis Berkman Company | Corrosion-resistant coated copper metal and method for making the same |
| US6794060B2 (en) | 1992-03-27 | 2004-09-21 | The Louis Berkman Company | Corrosion-resistant coated metal and method for making the same |
| US20050233088A1 (en) * | 2002-06-28 | 2005-10-20 | Walter Trakowski | Use of separation gas in continuous hot dip metal finishing |
| FR2857280A1 (en) * | 2003-07-08 | 2005-01-14 | Dominique Laurain | Tank for the uniform coating of components with a liquid coating material incorporating a system for the evacuation of surplus coating material, notably for zinc coating strip |
| DE10333766B4 (en) * | 2003-07-23 | 2009-01-22 | Thyssenkrupp Steel Ag | Method and apparatus for hot dip coating of metal strip |
| DE102004021214B4 (en) * | 2004-04-29 | 2007-11-22 | Air Liquide Gmbh | Method and device for inerting the environment of a running strip material after a dip treatment |
| BE1018124A3 (en) * | 2008-07-01 | 2010-05-04 | Ct Rech Metallurgiques Asbl | Metal products i.e. steel wires, coating method, involves coating metal products by molten metal using heavy gas at molecular weight greater than or equal to specific value, where gas does not decompose at temperatures below specific value |
| CN107881451B (en) * | 2017-12-12 | 2019-02-01 | 深圳市溢诚电子科技有限公司 | A kind of tin equipment |
| US11357341B2 (en) | 2019-02-26 | 2022-06-14 | Fasteners For Retail, Inc. | Retail merchandise display device with security shield |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE369436C (en) * | 1920-11-12 | 1923-02-19 | Childe Harold Wills | Circulation fan for hydrocarbon engines |
| DE617024C (en) * | 1929-06-12 | 1935-08-10 | Karl Daeves Dr Ing | Process to prevent the formation of white rust on galvanized goods |
| AU421751B2 (en) * | 1968-03-08 | 1972-02-25 | Australian Wire Industries Pty, Ltd | Improved method of and apparatus for wiping galvanised wire or strip |
| US3842896A (en) * | 1973-06-04 | 1974-10-22 | Monsanto Co | Method for producing composite metal wire |
| JPS5591967A (en) * | 1978-12-30 | 1980-07-11 | Nippon Steel Corp | One-side hot dipping method for steel strip |
| US4330574A (en) * | 1979-04-16 | 1982-05-18 | Armco Inc. | Finishing method for conventional hot dip coating of a ferrous base metal strip with a molten coating metal |
| AU538925B2 (en) * | 1979-04-16 | 1984-09-06 | Ak Steel Corporation | Finishing of hop dip coating of ferrous base metal |
| US4287238A (en) * | 1980-04-11 | 1981-09-01 | Bethlehem Steel Corporation | Protective atmosphere gas wiping apparatus and method of using |
| JPS57198253A (en) * | 1981-05-29 | 1982-12-04 | Nippon Steel Corp | Continuous zinc hot dipping method |
| FR2544337B1 (en) * | 1983-04-13 | 1985-08-09 | Ziegler Sa | METHOD AND INSTALLATION FOR THE CONTINUOUS COATING OF A STRIP USING AN OXIDIZABLE COATING |
-
1986
- 1986-09-19 DE DE19863631893 patent/DE3631893A1/en not_active Withdrawn
-
1987
- 1987-09-03 EP EP87112839A patent/EP0260533B1/en not_active Expired - Lifetime
- 1987-09-03 AT AT87112839T patent/ATE73176T1/en not_active IP Right Cessation
- 1987-09-03 DE DE8787112839T patent/DE3777040D1/en not_active Expired - Lifetime
- 1987-09-03 ES ES198787112839T patent/ES2030406T3/en not_active Expired - Lifetime
- 1987-09-08 AU AU78160/87A patent/AU600019B2/en not_active Ceased
- 1987-09-14 US US07/096,554 patent/US4862825A/en not_active Expired - Lifetime
- 1987-09-16 JP JP62233629A patent/JPS6386854A/en active Pending
-
1992
- 1992-03-11 GR GR920400430T patent/GR3004037T3/el unknown
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101222346B1 (en) | 2010-12-13 | 2013-01-14 | 동부제철 주식회사 | apparatus to produce galvanizing steel sheets |
Also Published As
| Publication number | Publication date |
|---|---|
| US4862825A (en) | 1989-09-05 |
| ES2030406T3 (en) | 1992-11-01 |
| GR3004037T3 (en) | 1993-03-31 |
| DE3777040D1 (en) | 1992-04-09 |
| EP0260533A2 (en) | 1988-03-23 |
| DE3631893A1 (en) | 1988-03-31 |
| AU7816087A (en) | 1988-03-24 |
| AU600019B2 (en) | 1990-08-02 |
| EP0260533A3 (en) | 1989-03-15 |
| ATE73176T1 (en) | 1992-03-15 |
| JPS6386854A (en) | 1988-04-18 |
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