EP1563112A2 - Device for hot-dip coating a metal bar - Google Patents

Device for hot-dip coating a metal bar

Info

Publication number
EP1563112A2
EP1563112A2 EP03811741A EP03811741A EP1563112A2 EP 1563112 A2 EP1563112 A2 EP 1563112A2 EP 03811741 A EP03811741 A EP 03811741A EP 03811741 A EP03811741 A EP 03811741A EP 1563112 A2 EP1563112 A2 EP 1563112A2
Authority
EP
European Patent Office
Prior art keywords
metal
weir
container
coating
guide channel
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP03811741A
Other languages
German (de)
French (fr)
Other versions
EP1563112B1 (en
Inventor
Rolf Brisberger
Bodo Falkenhahn
Holger Behrens
Michael Zielenbach
Bernhard Tenckhoff
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SMS Siemag AG
Original Assignee
SMS Demag AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by SMS Demag AG filed Critical SMS Demag AG
Publication of EP1563112A2 publication Critical patent/EP1563112A2/en
Application granted granted Critical
Publication of EP1563112B1 publication Critical patent/EP1563112B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • C23C2/24—Removing excess of molten coatings; Controlling or regulating the coating thickness using magnetic or electric fields
    • 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
    • C23C2/003—Apparatus
    • C23C2/0036—Crucibles
    • 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
    • C23C2/003—Apparatus
    • C23C2/0036—Crucibles
    • C23C2/00361—Crucibles characterised by structures including means for immersing or extracting the substrate through confining wall area
    • C23C2/00362—Details related to seals, e.g. magnetic means
    • 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
    • C23C2/30—Fluxes or coverings on molten baths
    • 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
    • C23C2/50—Controlling or regulating the coating processes

Definitions

  • the invention relates to a device for hot-dip coating a metal strand, in particular a steel strip, in which the metal strand is passed vertically through a container holding the molten coating metal and through an upstream guide channel, with at least two inductors arranged on both sides of the metal strand in the region of the guide channel to generate an electromagnetic Fields for retaining the coating metal in the container.
  • the strips are introduced into the dip coating bath from above in an immersion nozzle. Since the coating metal is in liquid form and you want to use gravitation together with blow-off devices to adjust the coating thickness, but the subsequent processes prohibit contact with the strip until the coating metal has completely solidified, the strip in the coating vessel must be vertical Direction to be redirected. This happens with a roller that runs in the liquid metal. Due to the liquid coating metal, this role is subject to heavy wear and is the cause of downtimes and thus failures in production.
  • JP 2000273602 A discloses a collecting trough below the guide channel, which is intended to receive coating metal that runs down through the guide channel. This is led to a container, from where it is returned to the coating bath via a pump. Here, too, no concrete and specific information is given on how to collect leaking coating metal.
  • EP 0 855 450 B1 deals more closely with the question of how the tightness of the lower region of the guide channel can be ensured.
  • various alternative solutions are disclosed here.
  • two slides which are arranged on both sides of the metal strand, can be moved perpendicular to the surface of the metal strand.
  • the slides act as sealing plugs and are kept in contact with the metal strand if necessary to prevent liquid from escaping down through the guide channel.
  • a relatively complex control of the slide is required to ensure their function.
  • Another embodiment provides that a conveyor belt is used which conveys emerging coating metal from the area below the guide channel into a collecting container.
  • this solution is very complex and involves the risk that the strip will become clogged with coating metal over time and thus can no longer perform its function.
  • a third alternative solution for preventing the escape of molten coating metal is provided by a gas nozzle system.
  • a gas stream is directed from below onto the guide channel, which exits the coating Tear the metal upwards and thus seal its opening downwards.
  • This solution is also very complex and only of limited practical use.
  • a hot-dip coating system is known, in which it is provided that a barrier is arranged in the bottom area of the coating vessel at the transition into the guide channel. This is to keep the flows in the liquid coating channel from the guide channel; for this purpose it is provided that it is equipped with streamlined walls or baffles.
  • the barrier mechanism disclosed in this document is not suitable for keeping the liquid coating metal from the area of the guide channel if necessary. In the same way, it is not possible to influence the coating process.
  • the invention is therefore based on the object of providing a device for hot-dip coating a metal strand with which it is possible to optimally guide the coating process and also to ensure reliable operation of the system in critical operating states in a simple manner, for example when the power supply to the inductors is interrupted is.
  • the solution to this problem by the invention is characterized by a closure means arranged above the guide channel in the bottom region of the container for selectively releasing or interrupting the flow of molten coating metal to the metal strand and / or to the guide channel.
  • the flow of the coating metal, in particular to the guide channel can thus optionally be released or interrupted, so that, in particular in the event of a malfunction, there is no risk of molten metal running out of the coating device via the guide channel.
  • a first development is based on the fact that the closure means is designed as a weir that can be moved relative to the bottom region of the container.
  • the weir has two interacting parts, each of which can be moved perpendicular to the surface of the metal strand.
  • the weir can be moved in the conveying direction of the metal strand.
  • the weir is formed in one piece and has the shape of a box.
  • the weir can be manufactured inexpensively and the operability of the device can be ensured in a particularly simple manner.
  • the weir advantageously has covering means in its upper end region facing away from the base region of the container. With these, it can be achieved that the coating bath, into which turbulence is introduced by the electromagnetic excitation by the inductors, calms down.
  • the cover means are designed as wall sections which extend parallel to the bottom region of the container.
  • the cover means are designed as a plate which has a gap-shaped recess for the passage of the metal strand.
  • the closure means in particular the weir, are preferably connected to manual, pneumatic or hydraulic actuation means; the actuating means can be connected to a system control which causes the flow of molten coating metal to be released or interrupted to the metal strand and / or the guide channel.
  • actuating means can be connected to a system control which causes the flow of molten coating metal to be released or interrupted to the metal strand and / or the guide channel.
  • FIG. 1 schematically shows the section through a hot-dip coating device with a metal strand passed through it
  • FIG. 2 is a perspective view of a two-part weir
  • FIG. 3 is a perspective view of a weir in one piece
  • Fig. 4 shows schematically the section through the hot dip coating device with two-part weir, which is equipped with cover means, and
  • Fig. 5 is a perspective view of a one-piece weir with cover means.
  • FIG. 1 schematically shows a hot-dip coating device with a metal strand 1 passed through it.
  • the device has a container 3 which is filled with molten coating metal 2.
  • molten coating metal 2 This can be zinc or aluminum, for example.
  • the metal strand 1 to be coated in the form of a steel strip passes the container 3 vertically upwards in the conveying direction R. It should be noted at this point that it is fundamentally also possible for the metal strand 1 to pass the container 3 from top to bottom.
  • the metal strand 1 For the passage of the metal strand 1 through the container 3, it is open in the bottom area; there is a guide channel 4 here. So that the molten coating metal 2 cannot flow down through the guide channel 4, there are two electromagnetic inductors 5 on both sides of the metal strand 1, which generate a magnetic field which counteracts the gravity of the coating metal 2 and thus seals the guide channel 4 downward.
  • the inductors 5 are two alternating field or traveling field inductors arranged opposite one another, which are operated in the frequency range from 2 Hz to 10 kHz and build up a transverse electromagnetic field perpendicular to the conveying direction R.
  • the preferred frequency range for single-phase systems (AC field inductors) is between 2 kHz and 10 kHz, that for multi-phase systems (e.g. traveling field inductors) between 2 Hz and 2 kHz.
  • a closure means 7 or 7 ′ in the form of a weir is arranged in two parts in the exemplary embodiment according to FIG. 1.
  • the two parts 7, 7 'of the weir are movable parallel to the bottom of the container 3 in the direction of the double arrow.
  • Actuating means 11 are provided for executing a movement, which are illustrated here only schematically as piston-cylinder units; any other type of actuation means can also be used.
  • the weir 7 and 7 ' is in the present case designed as a box divided into two parts, the two halves 7 and 7' being able to cooperate in such a way that they partition off the area of the guide channel 4 in the bottom area 6 of the container 3. This situation is outlined in Fig. 1.
  • the coating metal 2 cannot consequently penetrate to the guide channel 4 or to the metal strand 1.
  • This closed position of the weir 7 or 7 ' is particularly important for two operating cases:
  • this position is taken before the coating system is started up.
  • the metal strand 1 then moves - without any loading Layer metal 2 can penetrate it - in the conveying direction R upwards, and the inductors 5 are activated. Only then are the two weir parts 7 and 7 ′ moved in the direction of the double arrow away from the metal strand 1, so that coating metal 2 can penetrate through the box that thereby opens to the metal strand 1 and into the region of the guide channel 4. Since the inductors 5 are activated, there is no exit of coating metal 2 down through the guide channel 4.
  • the weir 7, 7 'thus initially surrounds the guide channel 4, which is open at the bottom, and thus the metal strand 1 running through it, to an optimized height the bottom area 6 of the container 3, so that no coating metal 2 can flow in the direction of the guide channel 4.
  • weir 7, 7 ' is then opened, so that coating metal 2 can flow into metal strand 1 and thus into guide channel 4, which is now, however, electromagnetically sealed by inductors 5, in an optimized manner in terms of time and quantity.
  • the weir 7, 7 ' is of importance when there is a power failure and the inductors 5 (e.g. until an emergency generator starts) can no longer perform their task, namely the guide channel 4 down through the built-up one to seal the electromagnetic field.
  • the two weir parts 7, 7 ' are moved in the direction of the double arrow towards the metal strand 1 until they touch and form the box-shaped cover around the metal strand 1.
  • no further coating metal 2 can reach the metal strand 1 and the guide channel 4, as a result of which a mechanical sealing of the coating channel 4 is ensured.
  • no coating metal can emerge downward from the guide channel 4.
  • Fig. 2 the weir 7 is again sketched in perspective, namely in the closed state.
  • the double arrows indicate the direction in which the two weir parts 7, 7 'can be moved with respect to the conveying direction R of the metal strand 1, for which purpose the actuating means 11, see. Fig. 1, serve. It can be seen that in the bottom area of the weir 7, 7 ' Passage opening for the metal strand 1 is present; in the illustrated closed position of the weir 7, 7 ', it is nevertheless ensured that no coating metal 2 can access the metal strand 1 and the guide channel 4.
  • weir 7, T is exposed to the coating metal, it is advantageous for stable and reliable operation of weir 7, T if it consists of as few individual parts as possible. While the solution according to FIGS. 1 and 2 provides a two-part weir 7, T, it can be seen from FIG. 3 that the weir 7 can also be formed in one part.
  • the box-shaped weir 7 is then in the state in which it is closed, on the bottom 6 of the container 3 and thus seals the guide channel 4. To open the weir 7, it is moved vertically upwards, ie in the conveying direction R, for which purpose the actuating means 11 are used.
  • cover means 9 are provided in the end region 8 of the weir 7, 7 ', with which care is taken to ensure that the flows generated by the inductors 5 do not occur can spread further towards the bathroom surface.
  • the swirling of the liquid coating metal 2 caused by the electromagnetic seal in the guide channel 4 or in the container 3 can thus be kept away by the design of the weir 7, T and in particular by the cover 9.
  • the weir 7 is formed in one piece, the following possibility is shown in FIG. 5:
  • the weir 7 is provided with a recess 10 in the upper region which enables the metal strand 1 to pass through.
  • the flows in the coating metal 2 generated by the inductors 5 are prevented here by the cover means 9, which here almost completely encapsulate the interior of the weir 7 from the rest of the coating bath. With this configuration, it is possible to optimally soothe the bathroom surface and thus ensure a high-quality coating.

Abstract

The invention relates to a device for hot-dip coating a metal bar (1), particularly a steel strip, in which the metal bar (1) is vertically directed through a container (3) receiving the molten coating metal (2) and a directing channel (4) that is arranged upstream thereof. Said device comprises at least two inductors (5) which are disposed on both sides of the metal bar (1) in the zone of the directing channel (4) and generate an electromagnetic field for retaining the coating metal (2) within the container (3). In order to better control the coating process, the inventive device is characterized by a sealing means (7, 7') which is arranged above the directing channel (4) in the bottom area (6) of the container (3) and alternatively releases or interrupts the flow of molten coating metal (2) to the metal bar (1) and/or the directing channel (4).

Description

Vorrichtung zur Schmelztauchbeschichtung eines MetallstrangesDevice for hot dip coating a metal strand
Die Erfindung betrifft eine Vorrichtung zur Schmelztauchbeschichtung eines Metallstranges, insbesondere eines Stahlbandes, in der der Metallstrang vertikal durch einen das geschmolzene Beschichtungsmetall aufnehmenden Behälter und durch einen vorgeschalteten Führungskanal hindurchgeführt wird, mit mindestens zwei beiderseits des Metallstranges im Bereich des Führungskanals angeordneten Induktoren zur Erzeugung eines elektromagnetischen Fel- des zum Zurückhalten des Beschichtungsmetalls im Behälter.The invention relates to a device for hot-dip coating a metal strand, in particular a steel strip, in which the metal strand is passed vertically through a container holding the molten coating metal and through an upstream guide channel, with at least two inductors arranged on both sides of the metal strand in the region of the guide channel to generate an electromagnetic Fields for retaining the coating metal in the container.
Klassische Metall-Tauchbeschichtungsanlagen für Metallbänder weisen einen wartungsintensiven Teil auf, nämlich das Beschichtungsgefäß mit der darin befindlichen Ausrüstung. Die Oberflächen der zu beschichtenden Metallbänder müssen vor der Beschichtung von Oxidresten gereinigt und für die Verbindung mit dem Beschichtungsmetall aktiviert werden. Aus diesem Grunde werden die Bandoberflächen vor der Beschichtung in Wärmeprozessen in einer reduzierenden Atmosphäre behandelt. Da die Oxidschichten zuvor chemisch oder ab- rasiv entfernt werden, werden mit dem reduzierenden Wärmeprozess die Ober- flächen so aktiviert, dass sie nach dem Wärmeprozess metallisch rein vorliegen.Classic metal dip coating systems for metal strips have a maintenance-intensive part, namely the coating vessel with the equipment contained therein. The surfaces of the metal strips to be coated must be cleaned of oxide residues before coating and activated for connection to the coating metal. For this reason, the strip surfaces are treated in a reducing atmosphere in heat processes before coating. Since the oxide layers are removed chemically or abrasively beforehand, the reducing heat process activates the surfaces in such a way that they are metallically pure after the heat process.
Mit der Aktivierung der Bandoberfläche steigt ' aber die Affinität dieser Bandoberflächen für den umgebenden Luftsauerstoff. Um zu verhindern, dass Luftsauerstoff vor dem Beschichtungsprozess wieder an die Bandoberflächen gelangen kann, werden die Bänder in einem Tauchrüssel von oben in das Tauchbeschichtungsbad eingeführt. Da das Beschichtungsmetall in flüssiger Form vorliegt und man die Gravitation zusammen mit Abblasvorrichtungen zur Einstellung der Beschichtungsdicke nutzen möchte, die nachfolgenden Prozes- se jedoch eine Bandberührung bis zur vollständigen Erstarrung des Beschichtungsmetalls verbieten, muss das Band im Beschichtungsgefäß in senkrechte Richtung umgelenkt werden. Das geschieht mit einer Rolle, die im flüssigen Metall läuft. Durch das flüssige Beschichtungsmetall unterliegt diese Rolle einem starken Verschleiß und ist Ursache von Stillständen und damit Ausfällen im Produktionsbetrieb.But with the activation of the strip surface 'increases the affinity of the strip surface for the surrounding atmospheric oxygen. In order to prevent atmospheric oxygen from reaching the strip surfaces again before the coating process, the strips are introduced into the dip coating bath from above in an immersion nozzle. Since the coating metal is in liquid form and you want to use gravitation together with blow-off devices to adjust the coating thickness, but the subsequent processes prohibit contact with the strip until the coating metal has completely solidified, the strip in the coating vessel must be vertical Direction to be redirected. This happens with a roller that runs in the liquid metal. Due to the liquid coating metal, this role is subject to heavy wear and is the cause of downtimes and thus failures in production.
Durch die gewünschten geringen Auflagedicken des Beschichtungsmetalls, die sich im Mikrometerbereich bewegen können, werden hohe Anforderungen an die Qualität der Bandoberfläche gestellt. Das bedeutet, dass auch die Oberflächen der bandführenden Rollen von hoher Qualität sein müssen. Störungen an diesen Oberflächen führen im allgemeinen zu Schäden an der Bandoberfläche. Dies ist ein weiterer Grund für häufige Stillstände der Anlage.Due to the desired low contact thickness of the coating metal, which can be in the micrometer range, high demands are placed on the quality of the strip surface. This means that the surfaces of the tape-guiding rolls must also be of high quality. Faults on these surfaces generally lead to damage to the belt surface. This is another reason for frequent plant downtimes.
Um die Probleme zu vermeiden, die im Zusammenhang mit den im flüssigen Beschichtungsmetall laufenden Rollen stehen, hat es Ansätze dazu gegeben, ein nach unten offenes Beschichtungsgefäß einzusetzen, das in seinem unte- ren Bereich einen Führungskanal zur vertikalen Banddurchführung nach oben aufweist und zur Abdichtung einen elektromagnetischen Verschluss einzusetzen. Es handelt sich hierbei um elektromagnetische Induktoren, die mit zurückdrängenden, pumpenden bzw. einschnürenden elektromagnetischen Wechselbzw. Wanderfeldern arbeiten, die das Beschichtungsgefäß nach unten abdich- ten.In order to avoid the problems associated with the rollers running in the liquid coating metal, attempts have been made to use a coating vessel which is open at the bottom and which has in its lower region a guide channel for vertical tape passage upwards and one for sealing electromagnetic lock. These are electromagnetic inductors that work with pushing back, pumping or constricting electromagnetic alternations. Working fields that seal the coating vessel downwards.
Eine solche Lösung ist beispielsweise aus der EP 0 673 444 B1 bekannt. Einen elektromagnetischen Verschluss zur Abdichtung des Beschichtungsgefäßes nach unten setzt auch die Lösung gemäß der WO 96/03533 bzw. diejenige ge- maß der JP 5086446 ein.Such a solution is known for example from EP 0 673 444 B1. The solution according to WO 96/03533 or that according to JP 5086446 also uses an electromagnetic closure for sealing the coating vessel downward.
Die Sicherstellung der Dichtigkeit des nach unten offenen Führungskanals des Beschichtungsgefäßes ist dabei eine wichtige und schwierige Aufgabe, vor allem, wenn man an den Notfall denkt, bei dem infolge Stromausfalls der elek- tromagnetische Verschluss versagen kann. Hierfür sind im Stand der Technik verschiedene Möglichkeiten offenbart. Die EP 0 630 421 B1 sieht hierfür unterhalb des Führungskanals eine Einschnürung vor, von der aus eine Rohrleitung zu einem Vorratsbehälter für schmelzflüssiges Beschichtungsmetall führt. Nähere Angaben zur Ausgestaltung dieser als Rücklaufsperre bezeichneten Einrichtung gehen aus diesem Dokument nicht hervor.Ensuring the tightness of the downwardly open guide channel of the coating vessel is an important and difficult task, especially when one thinks of an emergency in which the electromagnetic closure can fail due to a power failure. Various possibilities for this are disclosed in the prior art. EP 0 630 421 B1 provides a constriction for this below the guide channel, from which a pipeline leads to a reservoir for molten coating metal. This document does not provide any further details on the design of this device, which is referred to as a backstop.
Die JP 2000273602 A offenbart unterhalb des Führungskanals eine Auffangwanne, die Beschichtungsmetall aufnehmen soll, das durch den Führungskanal nach unten abläuft. Dieses wird zu einem Behälter geführt, von wo aus es über eine Pumpe dem Beschichtungsbad wieder zugeführt wird. Auch hier sind keine konkreten und spezifischen Angaben gemacht, wie auslaufendes Beschichtungsmetall aufgefangen werden soll.JP 2000273602 A discloses a collecting trough below the guide channel, which is intended to receive coating metal that runs down through the guide channel. This is led to a container, from where it is returned to the coating bath via a pump. Here, too, no concrete and specific information is given on how to collect leaking coating metal.
Die EP 0 855 450 B1 beschäftigt sich näher mit der Frage, wie die Dichtigkeit des unteren Bereichs des Führungskanals sichergestellt werden kann. Um diese zu gewährleisten, werden hier verschiedene Alternativlösungen offenbart. Nach einer Ausgestaltung können zwei Schieber, die beiderseits des Metallstranges angeordnet sind, senkrecht zur Oberfläche des Metallstranges an diesen herangefahren werden. Die Schieber fungieren als Verschlussstopfen und werden bei Bedarf in Kontakt mit dem Metallstrang gehalten, um einen Flüssigkeitsaustritt durch den Führungskanal nach unten zu verhindern. Allerdings ist eine relativ aufwendige Steuerung der Schieber erforderlich, um deren Funktion sicherzustellen. Eine andere Ausgestaltung sieht vor, dass ein Förderband eingesetzt wird, das austretendes Beschichtungsmetall vom Bereich unterhalb des Führungskanals in einen Auffangbehälter fördert. Diese Lösung ist jedoch sehr aufwendig und birgt die Gefahr, dass sich das Band im Laufe der Zeit mit Beschichtungsmetall zusetzt und somit seine Funktion nicht mehr ausführen kann. Eine dritte Alternativlösung zur Verhinderung des Austritts schmelzflüssigen Beschichtungsmetalls sieht ein Gasdüsensystem vor. Dabei wird ein Gasstrom von unten auf den Führungskanal gerichtet, der austretendes Beschichtungs- metall nach oben reißen und so dessen Öffnung nach unten abdichten soll. Auch diese Lösung ist sehr aufwendig und nur bedingt praxistauglich.EP 0 855 450 B1 deals more closely with the question of how the tightness of the lower region of the guide channel can be ensured. To ensure this, various alternative solutions are disclosed here. According to one embodiment, two slides, which are arranged on both sides of the metal strand, can be moved perpendicular to the surface of the metal strand. The slides act as sealing plugs and are kept in contact with the metal strand if necessary to prevent liquid from escaping down through the guide channel. However, a relatively complex control of the slide is required to ensure their function. Another embodiment provides that a conveyor belt is used which conveys emerging coating metal from the area below the guide channel into a collecting container. However, this solution is very complex and involves the risk that the strip will become clogged with coating metal over time and thus can no longer perform its function. A third alternative solution for preventing the escape of molten coating metal is provided by a gas nozzle system. A gas stream is directed from below onto the guide channel, which exits the coating Tear the metal upwards and thus seal its opening downwards. This solution is also very complex and only of limited practical use.
Aus der FR 2 798 396 A ist eine Schmelztauchbeschichtungsanlage bekannt, bei der vorgesehen ist, dass im Bodenbereich des Beschichtungsgefäßes am Übergang in den Führungskanal ein Sperrwerk angeordnet ist. Dieses soll die Strömungen im flüssigen Beschichtungskanal vom Führungskanal abhalten; hierzu ist vorgesehen, dass es mit strömungsgünstig ausgebildeten Wänden bzw. Leitblechen ausgestattet ist. Das in diesem Dokument offenbarte Sperrwerk ist jedoch nicht dazu geeignet, im Bedarfsfalle das flüssige Beschich- tungsmetall vom Bereich des Führungskanals abzuhalten. In gleicher Weise ist es mit ihm nicht möglich, Einfluss auf den Beschichtungsprozess zu nehmen.From FR 2 798 396 A a hot-dip coating system is known, in which it is provided that a barrier is arranged in the bottom area of the coating vessel at the transition into the guide channel. This is to keep the flows in the liquid coating channel from the guide channel; for this purpose it is provided that it is equipped with streamlined walls or baffles. However, the barrier mechanism disclosed in this document is not suitable for keeping the liquid coating metal from the area of the guide channel if necessary. In the same way, it is not possible to influence the coating process.
Der Erfindung liegt daher die Aufgabe zugrunde, eine Vorrichtung zum Schmelztauchbeschichten eines Metallstranges zu schaffen, mit der es möglich ist, den Beschichtungsprozess optimal zu führen und auch in einfacher Weise einen zuverlässigen Betrieb der Anlage in kritischen Betriebszuständen sicherzustellen, wenn beispielsweise die Stromversorgung der Induktoren unterbrochen ist.The invention is therefore based on the object of providing a device for hot-dip coating a metal strand with which it is possible to optimally guide the coating process and also to ensure reliable operation of the system in critical operating states in a simple manner, for example when the power supply to the inductors is interrupted is.
Die Lösung dieser Aufgabe durch die Erfindung ist gekennzeichnet durch ein oberhalb des Führungskanals im Bodenbereich des Behälters angeordnetes Verschlussmittel zum wahlweisen Freigeben oder Unterbrechen des Flusses geschmolzenen Beschichtungsmetalls zum Metallstrang und/oder zum Führungskanal.The solution to this problem by the invention is characterized by a closure means arranged above the guide channel in the bottom region of the container for selectively releasing or interrupting the flow of molten coating metal to the metal strand and / or to the guide channel.
Erfindungsgemäß kann also wahlweise der Fluss des Beschichtungsmetalls insbesondere zum Führungskanal freigegeben oder unterbrochen werden, so dass namentlich im Falle einer Betriebsstörung keine Gefahr besteht, dass geschmolzenes Metall aus der Beschichtungsvorrichtung über den Führungskanal ausläuft. Mit dieser Ausgestaltung ist es möglich, eine Schädigung der Beschichtungs- vorrichtung bzw. einen wirtschaftlichen Verlust im genannten Falle zu vermeiden.According to the invention, the flow of the coating metal, in particular to the guide channel, can thus optionally be released or interrupted, so that, in particular in the event of a malfunction, there is no risk of molten metal running out of the coating device via the guide channel. With this configuration, it is possible to avoid damage to the coating device or an economic loss in the case mentioned.
Eine erste Weiterbildung stellt darauf ab, dass das Verschlussmittel als Wehr ausgebildet ist, das relativ zum Bodenbereich des Behälters bewegbar ist.A first development is based on the fact that the closure means is designed as a weir that can be moved relative to the bottom region of the container.
Gemäß einer Ausführungsform weist das Wehr zwei zusammenwirkende Teile auf, die jeweils senkrecht zur Oberfläche des Metallstranges bewegbar sind. Alternativ oder additiv hierzu kann vorgesehen werden, dass das Wehr in För- derrichtung des Metallstranges bewegbar ist.According to one embodiment, the weir has two interacting parts, each of which can be moved perpendicular to the surface of the metal strand. As an alternative or in addition to this, it can be provided that the weir can be moved in the conveying direction of the metal strand.
Im letztgenannten Falle kann vorgesehen werden, dass das Wehr einteilig ausgebildet ist und die Form eines Kastens aufweist. Hierdurch kann sowohl die Herstellung des Wehres kostengünstig erfolgen als auch die Betriebstauglich- keit der Vorrichtung in besonders einfacher Weise sichergestellt werden.In the latter case it can be provided that the weir is formed in one piece and has the shape of a box. As a result, the weir can be manufactured inexpensively and the operability of the device can be ensured in a particularly simple manner.
Mit Vorteil weist das Wehr in seinem oberen, dem Bodenbereich des Behälters abgewandten Endbereich Abdeckmittel auf. Mit diesen kann erreicht werden, dass sich das Beschichtungsbad, in das durch die elektromagnetische Anre- gung durch die Induktoren Turbulenzen eingebracht werden, beruhigt. Gemäß einer Ausgestaltung ist vorgesehen, dass die Abdeckmittel als Wandabschnitte ausgebildet sind, die sich parallel zum Bodenbereich des Behälters erstrecken. Eine andere Ausbildung sieht vor, dass die Abdeckmittel als Platte ausgebildet sind, die eine spaltförmige Ausnehmung für den Durchtritt des Metallstranges aufweist.The weir advantageously has covering means in its upper end region facing away from the base region of the container. With these, it can be achieved that the coating bath, into which turbulence is introduced by the electromagnetic excitation by the inductors, calms down. According to one embodiment, it is provided that the cover means are designed as wall sections which extend parallel to the bottom region of the container. Another embodiment provides that the cover means are designed as a plate which has a gap-shaped recess for the passage of the metal strand.
Die Verschlussmittel, insbesondere das Wehr, stehen bevorzugt mit manuellen, pneumatischen oder hydraulischen Betätigungsmitteln in Verbindung; die Betätigungsmittel können dabei mit einer Anlagensteuerung in Verbindung stehen, die ein Freigeben oder Unterbrechen des Flusses geschmolzenen Beschichtungsmetalls zum Metallstrang und/oder zum Führungskanal veranlasst. In der Zeichnung sind Ausführungsbeispiele der Erfindung dargestellt. Es zeigen:The closure means, in particular the weir, are preferably connected to manual, pneumatic or hydraulic actuation means; the actuating means can be connected to a system control which causes the flow of molten coating metal to be released or interrupted to the metal strand and / or the guide channel. Exemplary embodiments of the invention are shown in the drawing. Show it:
Fig. 1 schematisch den Schnitt durch eine Schmelztauch- Beschichtungsvorrichtung mit einem durch diese hindurch geführten Metallstrang,1 schematically shows the section through a hot-dip coating device with a metal strand passed through it,
Fig. 2 die perspektivische Ansicht eines zweiteilig ausgebildeten Wehres,2 is a perspective view of a two-part weir,
Fig. 3 die perspektivische Ansicht eines einteilig ausgebildeten Wehres,3 is a perspective view of a weir in one piece,
Fig. 4 schematisch den Schnitt durch die Schmelztauch- Beschichtungsvorrichtung mit zweiteilig ausgebildetem Wehr, wobei dieses mit Abdeckmitteln ausgestattet ist, undFig. 4 shows schematically the section through the hot dip coating device with two-part weir, which is equipped with cover means, and
Fig. 5 die perspektivische Ansicht eines einteilig ausgebildeten Wehres mit Abdeckmitteln.Fig. 5 is a perspective view of a one-piece weir with cover means.
Fig. 1 zeigt schematisch eine Schmelztauch-Beschichtungsvorrichtung mit einem durch diese hindurch geführten Metallstrang 1 .1 schematically shows a hot-dip coating device with a metal strand 1 passed through it.
Die Vorrichtung weist einen Behälter 3 auf, der mit schmelzflüssigem Be- schichtungsmetall 2 gefüllt ist. Bei diesem kann es sich beispielsweise um Zink oder Aluminium handeln. Der zu beschichtende Metallstrang 1 in Form eines Stahlbandes passiert den Behälter 3 in Förderrichtung R vertikal nach oben. Es sei an dieser Stelle angemerkt, dass es grundsätzlich auch möglich ist, dass der Metallstrang 1 den Behälter 3 von oben nach unten passiert. Zum Durchtritt des Metallstranges 1 durch den Behälter 3 ist dieser im Bodenbereich geöffnet; hier befindet sich ein Führungskanal 4. Damit das schmelzflüssige Beschichtungsmetall 2 nicht durch den Führungskanal 4 nach unten abfließen kann, befinden sich beiderseits des Metallstranges 1 zwei elektromagnetische Induktoren 5, die ein magnetisches Feld erzeugen, das der Schwerkraft des Beschichtungsmetalls 2 entgegenwirkt und damit den Führungskanal 4 nach unten hin abdichtet.The device has a container 3 which is filled with molten coating metal 2. This can be zinc or aluminum, for example. The metal strand 1 to be coated in the form of a steel strip passes the container 3 vertically upwards in the conveying direction R. It should be noted at this point that it is fundamentally also possible for the metal strand 1 to pass the container 3 from top to bottom. For the passage of the metal strand 1 through the container 3, it is open in the bottom area; there is a guide channel 4 here. So that the molten coating metal 2 cannot flow down through the guide channel 4, there are two electromagnetic inductors 5 on both sides of the metal strand 1, which generate a magnetic field which counteracts the gravity of the coating metal 2 and thus seals the guide channel 4 downward.
Bei den Induktoren 5 handelt es sich um zwei gegenüber angeordnete Wechselfeld- oder Wanderfeldinduktoren, die im Frequenzbereich von 2 Hz bis 10 kHz betrieben werden und ein elektromagnetisches Querfeld senkrecht zur Förderrichtung R aufbauen. Der bevorzugte Frequenzbereich für einphasige Systeme (Wechselfeldinduktoren) liegt zwischen 2 kHz und 10 kHz, der für mehrphasige Systeme (z. B. Wanderfeldinduktoren) zwischen 2 Hz und 2 kHz.The inductors 5 are two alternating field or traveling field inductors arranged opposite one another, which are operated in the frequency range from 2 Hz to 10 kHz and build up a transverse electromagnetic field perpendicular to the conveying direction R. The preferred frequency range for single-phase systems (AC field inductors) is between 2 kHz and 10 kHz, that for multi-phase systems (e.g. traveling field inductors) between 2 Hz and 2 kHz.
Im Bodenbereich 6 des Behälters 3 ist ein im Ausführungsbeispiel gemäß Fig. 1 zweiteilig ausgebildetes Verschlussmittel 7 bzw. 7' in Form eines Wehres angeordnet. Die beiden Teile 7, 7' des Wehres sind dabei parallel zum Boden des Behälters 3 in Richtung des Doppelpfeiles beweglich. Zur Ausführung einer Bewegung sind Betätigungsmittel 11 vorgesehen, die hier nur schematisch als Kolben-Zylinder-Einheiten illustriert sind; genauso kann jede andere Art von Betätigungsmittel zum Einsatz kommen.In the bottom area 6 of the container 3, a closure means 7 or 7 ′ in the form of a weir is arranged in two parts in the exemplary embodiment according to FIG. 1. The two parts 7, 7 'of the weir are movable parallel to the bottom of the container 3 in the direction of the double arrow. Actuating means 11 are provided for executing a movement, which are illustrated here only schematically as piston-cylinder units; any other type of actuation means can also be used.
Das Wehr 7 bzw. 7' ist vorliegend als in zwei Teile geteilter Kasten ausgebildet, wobei die beiden Hälfen 7 und 7' so zusammenwirken können, dass sie den Bereich des Führungskanals 4 im Bodenbereich 6 des Behälters 3 abschotten. Diese Situation ist in Fig. 1 skizziert. Das Beschichtungsmetall 2 kann folglich nicht zum Führungskanal 4 bzw. zum Metallstrang 1 vordringen. Diese geschlossene Stellung des Wehres 7 bzw. 7' ist insbesondere für zwei Betriebsfälle von Bedeutung:The weir 7 and 7 'is in the present case designed as a box divided into two parts, the two halves 7 and 7' being able to cooperate in such a way that they partition off the area of the guide channel 4 in the bottom area 6 of the container 3. This situation is outlined in Fig. 1. The coating metal 2 cannot consequently penetrate to the guide channel 4 or to the metal strand 1. This closed position of the weir 7 or 7 'is particularly important for two operating cases:
Zum einen wird diese Position eingenommen, bevor die Beschichtungsanlage hochgefahren wird. Der Metallstrang 1 bewegt sich dann - ohne, dass Be- schichtungsmetall 2 an ihn heran dringen kann - in Förderrichtung R nach oben, und die Induktoren 5 werden aktiviert. Erst dann werden die beiden Wehrteile 7 bzw. 7' in Richtung des Doppelpfeils vom Metallstrang 1 weg bewegt, so dass durch den sich dadurch öffnenden Kasten Beschichtungsmetall 2 zum Metallstrang 1 und in den Bereich des Führungskanals 4 vordringen kann. Da die Induktoren 5 aktiviert sind, erfolgt kein Austritt von Beschichtungsmetall 2 nach unten durch den Führungskanal 4. Das Wehr 7, 7' umschließt also zunächst den nach unten geöffneten Führungskanal 4 und somit den durch diesen hindurch laufenden Metallstrang 1 bis in eine optimierte Höhe über dem Bodenbereich 6 des Behälters 3, so dass kein Beschichtungsmetall 2 in Richtung Füh- rungskanal 4 fließen kann. Mit Beginn des Beschichtungsprozesses wird dann das Wehr 7, 7' geöffnet, so dass das Beschichtungsmetall 2 zum Metallstrang 1 und somit in den Führungskanal 4, der jetzt jedoch durch die Induktoren 5 elektromagnetisch abgedichtet ist, zeit- und mengenoptimiert einfließen kann.On the one hand, this position is taken before the coating system is started up. The metal strand 1 then moves - without any loading Layer metal 2 can penetrate it - in the conveying direction R upwards, and the inductors 5 are activated. Only then are the two weir parts 7 and 7 ′ moved in the direction of the double arrow away from the metal strand 1, so that coating metal 2 can penetrate through the box that thereby opens to the metal strand 1 and into the region of the guide channel 4. Since the inductors 5 are activated, there is no exit of coating metal 2 down through the guide channel 4. The weir 7, 7 'thus initially surrounds the guide channel 4, which is open at the bottom, and thus the metal strand 1 running through it, to an optimized height the bottom area 6 of the container 3, so that no coating metal 2 can flow in the direction of the guide channel 4. At the beginning of the coating process, weir 7, 7 'is then opened, so that coating metal 2 can flow into metal strand 1 and thus into guide channel 4, which is now, however, electromagnetically sealed by inductors 5, in an optimized manner in terms of time and quantity.
Zum anderen hat das Wehr 7, 7' dann Bedeutung, wenn es zu einem Stromausfall kommt und die Induktoren 5 (z. B. bis zum Anspringen eines Notstromaggregats) ihre Aufgabe nicht mehr wahrnehmen können, nämlich den Führungskanal 4 nach unten hin durch das aufgebaute elektromagnetische Feld abzudichten. In diesem Falle werden die beiden Wehrteile 7, 7' in Richtung des Doppelpfeils auf den Metallstrang 1 zu bewegt, bis sie sich berühren und die kastenförmige Abdeckung um den Metallstrang 1 herum bilden. Folglich kann kein weiteres Beschichtungsmetall 2 mehr zum Metallstrang 1 und zum Führungskanal 4 mehr gelangen, wodurch eine mechanische Abdichtung des Be- schichtungskanals 4 sichergestellt ist. Hierdurch kann kein Beschichtungsmetall nach unten aus dem Führungskanal 4 austreten.On the other hand, the weir 7, 7 'is of importance when there is a power failure and the inductors 5 (e.g. until an emergency generator starts) can no longer perform their task, namely the guide channel 4 down through the built-up one to seal the electromagnetic field. In this case, the two weir parts 7, 7 'are moved in the direction of the double arrow towards the metal strand 1 until they touch and form the box-shaped cover around the metal strand 1. As a result, no further coating metal 2 can reach the metal strand 1 and the guide channel 4, as a result of which a mechanical sealing of the coating channel 4 is ensured. As a result, no coating metal can emerge downward from the guide channel 4.
In Fig. 2 ist das Wehr 7, nochmals in perspektivischer Darstellung skizziert, und zwar im geschlossenen Zustand. Durch die Doppelpfeile ist angedeutet, in welche Richtung in Bezug auf die Förderrichtung R des Metallstranges 1 die beiden Wehrteile 7, 7' bewegt werden können, wozu die Betätigungsmittel 11 , s. Fig. 1 , dienen. Zu erkennen ist, dass im Bodenbereich des Wehres 7, 7' eine Durchtrittsöffnung für den Metallstrang 1 vorhanden ist; in der dargestellten geschlossenen Position des Wehres 7, 7' ist dennoch sichergestellt, dass kein Beschichtungsmetall 2 zum Metallstrang 1 und zum Führungskanal 4 zutreten kann.In Fig. 2 the weir 7 is again sketched in perspective, namely in the closed state. The double arrows indicate the direction in which the two weir parts 7, 7 'can be moved with respect to the conveying direction R of the metal strand 1, for which purpose the actuating means 11, see. Fig. 1, serve. It can be seen that in the bottom area of the weir 7, 7 ' Passage opening for the metal strand 1 is present; in the illustrated closed position of the weir 7, 7 ', it is nevertheless ensured that no coating metal 2 can access the metal strand 1 and the guide channel 4.
Da das Wehr 7, T dem Beschichtungsmetall ausgesetzt ist, ist es für einen stabilen und zuverlässigen Betrieb des Wehres 7, T vorteilhaft, wenn es aus möglichst wenigen Einzelteilen besteht. Während die Lösung gemäß Fig. 1 bzw. Fig. 2 ein zweiteiliges Wehr 7, T vorsieht, ist Fig. 3 zu entnehmen, dass das Wehr 7 auch einteilig ausgebildet sein kann. Das kastenförmig ausgebildete Wehr 7 setzt dann im Zustand, in dem es geschlossen ist, auf dem Boden 6 des Behälters 3 auf und dichtet damit den Führungskanal 4 ab. Zum Öffnen des Wehres 7 wird es senkrecht nach oben, also in Förderrichtung R, bewegt, wozu wiederum die Betätigungsmittel 1 1 eingesetzt werden.Since weir 7, T is exposed to the coating metal, it is advantageous for stable and reliable operation of weir 7, T if it consists of as few individual parts as possible. While the solution according to FIGS. 1 and 2 provides a two-part weir 7, T, it can be seen from FIG. 3 that the weir 7 can also be formed in one part. The box-shaped weir 7 is then in the state in which it is closed, on the bottom 6 of the container 3 and thus seals the guide channel 4. To open the weir 7, it is moved vertically upwards, ie in the conveying direction R, for which purpose the actuating means 11 are used.
Für die Durchführung eines Beschichtungsprozesses zur Herstellung eines qualitativ hochwertigen beschichteten Metallstrangs ist es vorteilhaft, wenn dafür Sorge getragen wird, dass die Oberfläche des Beschichtungsbades möglichst ruhig bleibt. Dies ist deshalb nicht von Hause aus gewährleistet, weil die elektromagnetischen Induktoren 5 durch die erzeugten Magnetfelder eine Strö- mung im Beschichtungsmetall 2 induzieren.When carrying out a coating process for producing a high-quality coated metal strand, it is advantageous if care is taken to ensure that the surface of the coating bath remains as quiet as possible. This is not guaranteed from the outset because the electromagnetic inductors 5 induce a flow in the coating metal 2 through the magnetic fields generated.
Um die Oberfläche des Beschichtungsbades zu beruhigen, ist gemäß dem Ausführungsbeispiel nach Fig. 4 vorgesehen, dass im Endbereich 8 des Wehres 7, 7' Abdeckmittel 9 vorgesehen sind, mit denen dafür Sorge getragen wird, dass sich die von den Induktoren 5 erzeugten Strömungen nicht weiter in Richtung Badoberfläche ausbreiten können.In order to calm the surface of the coating bath, according to the exemplary embodiment according to FIG. 4 it is provided that cover means 9 are provided in the end region 8 of the weir 7, 7 ', with which care is taken to ensure that the flows generated by the inductors 5 do not occur can spread further towards the bathroom surface.
Die durch die elektromagnetische Abdichtung im Führungskanal 4 bzw. im Behälter 3 hervorgerufene Verwirbelung des flüssigen Beschichtungsmetalls 2 kann also durch die Ausgestaltung des Wehres 7, T und insbesondere durch die Abdeckung 9 ferngehalten werden. Im Falle dessen, dass das Wehr 7 einteilig ausgebildet ist, ergibt sich folgende in Fig. 5 dargestellte Möglichkeit: Hier ist das Wehr 7 mit einer Ausnehmung 10 im oberen Bereich versehen, die einen Durchtritt des Metallstranges 1 ermöglicht. Die durch die Induktoren 5 erzeugten Strömungen im Beschichtungsmetall 2 werden hier durch die Abdeckmittel 9, die hier fast eine vollständige Abkapselung des Innenbereichs des Wehres 7 zum restlichen Beschichtungsbad darstellten, abgehalten. Mit dieser Ausgestaltung ist es möglich, die Badoberfläche optimal zu beruhigen und so eine hochwertige Beschichtung sicherzustellen.The swirling of the liquid coating metal 2 caused by the electromagnetic seal in the guide channel 4 or in the container 3 can thus be kept away by the design of the weir 7, T and in particular by the cover 9. In the event that the weir 7 is formed in one piece, the following possibility is shown in FIG. 5: Here the weir 7 is provided with a recess 10 in the upper region which enables the metal strand 1 to pass through. The flows in the coating metal 2 generated by the inductors 5 are prevented here by the cover means 9, which here almost completely encapsulate the interior of the weir 7 from the rest of the coating bath. With this configuration, it is possible to optimally soothe the bathroom surface and thus ensure a high-quality coating.
Im Falle einer Betriebsstörung und namentlich bei Ausfall der elektromagnetischen Induktoren 5 wird das Wehr 7 durch die Betätigungsmittel 11 geschlossen, so dass keine Gefahr besteht, dass das Beschichtungsmetall 2 aus dem Behälter 3 ausläuft. In the event of a malfunction and in particular if the electromagnetic inductors 5 fail, the weir 7 is closed by the actuating means 11, so that there is no risk that the coating metal 2 will leak out of the container 3.
BezuqszeichenlisteLIST OF REFERENCES
1 Metallstrang (Stahlband)1 metal strand (steel band)
2 Beschichtungsmetall2 coating metal
3 Behälter3 containers
4 Führungskanal4 guide channel
5 Induktor5 inductor
6 Bodenbereich des Behälters6 bottom area of the container
7 Verschlussmittel7 closure means
7' Verschlussmittel7 'closing means
8 Endbereich der Verschlussmittel8 end area of the closure means
9 Abdeckmittel9 covering means
10 Ausnehmung10 recess
11 Betätigungsmittel11 actuating means
R Förderrichtung R direction of conveyance

Claims

Patentansprüche claims
1. Vorrichtung zur Schmelztauchbeschichtung eines Metallstranges (1), insbesondere eines Stahlbandes, in der der Metallstrang (1) vertikal durch einen das geschmolzene Beschichtungsmetall (2) aufnehmenden Behälter (3) und durch einen vorgeschalteten Führungskanal (4) hindurchgeführt wird, mit mindestens zwei beiderseits des Metallstranges (1) im Bereich des Führungskanals (4) angeordneten Induktoren (5) zur Erzeugung eines elektromagnetischen Feldes zum Zurückhalten des Beschichtungsmetalls1. Device for hot-dip coating a metal strand (1), in particular a steel strip, in which the metal strand (1) is passed vertically through a container (3) holding the molten coating metal (2) and through an upstream guide channel (4), with at least two Inductors (5) arranged on both sides of the metal strand (1) in the region of the guide channel (4) for generating an electromagnetic field for retaining the coating metal
(2) im Behälter (3), gekennzeichnet durch, ein oberhalb des Führungskanals (4) im Bodenbereich (6) des Behälters(2) in the container (3), characterized by one above the guide channel (4) in the bottom region (6) of the container
(3) angeordnetes Verschlussmittel (7, 7') zum wahlweisen Freigeben oder Unterbrechen des Flusses geschmolzenen Beschichtungsmetalls (2) zum Metallstrang (1) und/oder zum Führungskanal (4).(3) arranged closure means (7, 7 ') for selectively releasing or interrupting the flow of molten coating metal (2) to the metal strand (1) and / or to the guide channel (4).
2. Vorrichtung nach Anspruch 1 , dadurch gekennzeichnet, dass das Verschlussmittel (7, 7') als Wehr ausgebildet ist, das relativ zum Bodenbereich (6) des Behälters (3) bewegbar ist.2. Device according to claim 1, characterized in that the closure means (7, 7 ') is designed as a weir which is movable relative to the bottom region (6) of the container (3).
3. Vorrichtung nach Anspruch 2, dadurch gekennzeichnet, dass das Wehr zwei zusammenwirkende Teile (7, 7') aufweist, die jeweils senkrecht zur Oberfläche des Metallstranges (1) bewegbar sind.3. Device according to claim 2, characterized in that the weir has two interacting parts (7, 7 '), each of which can be moved perpendicular to the surface of the metal strand (1).
4. Vorrichtung nach Anspruch 2, dadurch gekennzeichnet, dass das Wehr in Förderrichtung (R) des Metallstranges (1) bewegbar ist.4. The device according to claim 2, characterized in that the weir can be moved in the conveying direction (R) of the metal strand (1).
5. Vorrichtung nach Anspruch 4, dadurch gekennzeichnet, dass das Wehr einteilig ausgebildet ist und die Form eines Kastens auf- weist.5. The device according to claim 4, characterized in that the weir is formed in one piece and has the shape of a box.
6. Vorrichtung nach einem der Ansprüche 2 bis 5, dadurch gekennzeichne , dass das Wehr (7, 7') in seinem oberen, dem Bodenbereich (6) des Be- hälters (3) abgewandten Endbereich (8) Abdeckmittel (9) aufweist.6. Device according to one of claims 2 to 5, characterized in that the weir (7, 7 ') has cover means (9) in its upper end region (8) facing away from the base region (6) of the container (3).
7. Vorrichtung nach Anspruch 6, dadurch gekennzeichnet, dass die Abdeckmittel (9) als Wandabschnitte ausgebildet sind, die sich parallel zum Bodenbereich (6) des Behälters (3) erstrecken.7. The device according to claim 6, characterized in that the cover means (9) are designed as wall sections which extend parallel to the bottom region (6) of the container (3).
8. Vorrichtung nach Anspruch 6, dadu rch gekennzeic hnet, dass die Abdeckmittel (9) als Platte ausgebildet sind, die eine spaltförmige Ausnehmung (10) für den Durchtritt des Metallstranges (1) aufweist.8. The device according to claim 6, dadu rch gekennzeic hnet that the cover means (9) are designed as a plate which has a gap-shaped recess (10) for the passage of the metal strand (1).
9. Vorrichtung nach einem der Ansprüche 1 bis 8, dadu rch gekennzeichnet, dass die Verschlussmittel (7, 7'), insbesondere das Wehr, mit manuellen, pneumatischen oder hydraulischen Betätigungsmitteln (11) in Verbindung stehen.9. Device according to one of claims 1 to 8, characterized in that the closure means (7, 7 '), in particular the weir, are connected to manual, pneumatic or hydraulic actuating means (11).
10. Vorrichtung nach Anspruch 9, dadu rch gekennzei chnet, dass die Betätigungsmittel (1 1 ) mit einer Anlagensteuerung in Verbindung stehen, die ein Freigeben oder Unterbrechen des Flusses geschmolzenen Beschichtungsmetalls (2) zum Metallstrang (1 ) und/oder zum Führungskanal (4) veranlasse 10. The apparatus of claim 9, dadu rch gekennzei chnet, that the actuating means (1 1) are connected to a system controller which causes the flow of molten coating metal (2) to be released or interrupted to the metal strand (1) and / or the guide channel (4)
EP03811741A 2002-11-22 2003-10-25 Device for hot-dip coating a metal bar Expired - Lifetime EP1563112B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10254513A DE10254513A1 (en) 2002-11-22 2002-11-22 Device for hot dip coating a metal strand
DE10254513 2002-11-22
PCT/EP2003/011890 WO2004048633A2 (en) 2002-11-22 2003-10-25 Device for hot-dip coating a metal bar

Publications (2)

Publication Number Publication Date
EP1563112A2 true EP1563112A2 (en) 2005-08-17
EP1563112B1 EP1563112B1 (en) 2006-03-15

Family

ID=32240281

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03811741A Expired - Lifetime EP1563112B1 (en) 2002-11-22 2003-10-25 Device for hot-dip coating a metal bar

Country Status (21)

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US (1) US7601221B2 (en)
EP (1) EP1563112B1 (en)
JP (1) JP4426460B2 (en)
KR (1) KR101065202B1 (en)
CN (1) CN100523267C (en)
AT (1) ATE320514T1 (en)
AU (1) AU2003302432B2 (en)
BR (1) BR0316398A (en)
CA (1) CA2506969A1 (en)
DE (2) DE10254513A1 (en)
EG (1) EG23854A (en)
ES (1) ES2259778T3 (en)
MX (1) MXPA05005419A (en)
MY (1) MY134734A (en)
PL (1) PL375313A1 (en)
RS (1) RS50731B (en)
RU (1) RU2325465C2 (en)
TW (1) TWI291999B (en)
UA (1) UA78891C2 (en)
WO (1) WO2004048633A2 (en)
ZA (1) ZA200503002B (en)

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Publication number Priority date Publication date Assignee Title
JP2008240082A (en) * 2007-03-28 2008-10-09 Mitsubishi-Hitachi Metals Machinery Inc Hot dip plating equipment
JP2008240081A (en) * 2007-03-28 2008-10-09 Mitsubishi-Hitachi Metals Machinery Inc Hot dip plating equipment
KR101221655B1 (en) 2010-08-24 2013-01-14 현대하이스코 주식회사 Device for continuous hot-dip coating of steel strips
JP5335159B1 (en) * 2012-04-25 2013-11-06 日新製鋼株式会社 Method for producing black-plated steel sheet and method for producing molded body of black-plated steel sheet

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US3470939A (en) * 1965-11-08 1969-10-07 Texas Instruments Inc Continuous chill casting of cladding on a continuous support
US3521696A (en) * 1967-04-19 1970-07-28 Brun Sensor Systems Inc Continuous casting line speed control
US3568753A (en) * 1967-12-18 1971-03-09 Texas Instruments Inc Process of fabricating a composite zinc printing plate
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Also Published As

Publication number Publication date
MXPA05005419A (en) 2005-08-26
US20060137605A1 (en) 2006-06-29
KR20050086706A (en) 2005-08-30
EG23854A (en) 2007-11-11
DE10254513A1 (en) 2004-06-03
TW200523396A (en) 2005-07-16
RS50731B (en) 2010-08-31
CN100523267C (en) 2009-08-05
MY134734A (en) 2007-12-31
ES2259778T3 (en) 2006-10-16
CN1714166A (en) 2005-12-28
WO2004048633A3 (en) 2004-11-25
UA78891C2 (en) 2007-04-25
KR101065202B1 (en) 2011-09-19
CA2506969A1 (en) 2004-06-10
JP4426460B2 (en) 2010-03-03
WO2004048633A2 (en) 2004-06-10
AU2003302432A1 (en) 2004-06-18
AU2003302432B2 (en) 2009-01-29
ATE320514T1 (en) 2006-04-15
ZA200503002B (en) 2005-11-23
DE50302688D1 (en) 2006-05-11
TWI291999B (en) 2008-01-01
US7601221B2 (en) 2009-10-13
RU2005119648A (en) 2007-01-10
PL375313A1 (en) 2005-11-28
EP1563112B1 (en) 2006-03-15
JP2006507406A (en) 2006-03-02
RS20050381A (en) 2007-08-03
RU2325465C2 (en) 2008-05-27
BR0316398A (en) 2005-09-27

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