EP1483424B1 - Device for hot dip coating metal strands - Google Patents

Device for hot dip coating metal strands Download PDF

Info

Publication number
EP1483424B1
EP1483424B1 EP03743812A EP03743812A EP1483424B1 EP 1483424 B1 EP1483424 B1 EP 1483424B1 EP 03743812 A EP03743812 A EP 03743812A EP 03743812 A EP03743812 A EP 03743812A EP 1483424 B1 EP1483424 B1 EP 1483424B1
Authority
EP
European Patent Office
Prior art keywords
coils
metal
metal strip
correction
movement direction
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
Application number
EP03743812A
Other languages
German (de)
French (fr)
Other versions
EP1483424A1 (en
Inventor
Frank Bergmann
Michael Zielenbach
Walter Trakowski
Olaf Norman Jepsen
Holger Behrens
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 EP1483424A1 publication Critical patent/EP1483424A1/en
Application granted granted Critical
Publication of EP1483424B1 publication Critical patent/EP1483424B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • C23C2/24—Removing excess of molten coatings; Controlling or regulating the coating thickness using magnetic or electric fields

Definitions

  • the invention relates to a device for hot-dip coating of metal strands, in particular of steel strip, in which the metal strand can be guided vertically through a container receiving the molten coating metal and through an upstream guide channel.
  • an electromagnetic inductor is arranged in the region of the guide channel, which induces induction currents for retaining the coating metal in the container by means of an electromagnetic traveling field in the coating metal, which exert an electromagnetic force in interaction with the traveling electromagnetic field, wherein the inductor has at least two main coils in the direction of movement of the metal strand are arranged successively, as well as having at least two correction coils for position control of the metal strand in the guide channel in the direction normal to the surface of the metal strand, which are also arranged successively in the direction of movement of the metal strand.
  • the belts are introduced from above into the dip-coating bath in a plunger.
  • the coating metal is in liquid form and gravity is to be used with blowers to set the coating thickness, but subsequent processes prohibit tape contact until the coating metal solidifies completely, the tape in the coating vessel must be deflected in the vertical direction. This happens with a roller that runs in liquid metal. Due to the liquid coating metal, this roller is subject to heavy wear and is the cause of downtimes and thus failures in production.
  • the known dip coating systems also have limit values in the coating speed. These are the limit values for the operation of the wiping nozzle, the cooling processes of the continuous metal strip and the heating process for setting alloy layers in the coating metal. This leads to the case that on the one hand, the maximum speed is generally limited and on the other certain metal bands can not be driven at the maximum speed possible for the system.
  • non-ferromagnetic metal tapes are indeed possible, but there are problems with substantially ferromagnetic steel strips that they are drawn in the electromagnetic seals by the ferromagnetism to the channel walls, whereby the tape surface is damaged. Furthermore, it is problematic that the coating metal is heated by the inductive fields inadmissible.
  • the position of the passing ferromagnetic steel strip through the guide channel between two traveling field inductors is an unstable equilibrium. Only in the middle of the guide channel is the sum of the magnetic forces of attraction acting on the tape zero. As soon as the steel strip is deflected from its center position, it gets closer to one of the two inductors, while it moves away from the other inductor. Causes of such a deflection may be simple flatness errors of the tape. To call it are any kind of tape waves in the direction, seen across the width of the band (Centerbuckles, Quarterbuckles, edge waves, flutter, twisting, crossbow, S-shape, etc.). The magnetic induction, which is responsible for the magnetic attraction decreases according to an exponential function with the distance from the inductor in their field strength.
  • the attraction force decreases with the square of the induction field strength with increasing distance from the inductor. For the deflected band, this means that with the deflection in one direction, the attractive force to one inductor expands exponentially, while the restoring force from the other inductor exponentially decreases. Both effects are self-reinforcing, so the balance is unstable.
  • DE 195 35 854 A1 and DE 100 14 867 A1 give hints.
  • additional correction coils are provided in addition to the coils for generating the electromagnetic traveling field, which are in communication with a control system and ensure that the metal strip is retrieved when departing from the central position in this.
  • the invention is therefore based on the object, a device for hot dip coating of metal strands of the type mentioned in such a way that the mentioned disadvantages are overcome. It should be possible in particular to effectively hold the metal strip in the middle of the guide channel.
  • This object is achieved in that at least a portion of the correction coils, viewed in the direction of movement of the metal strand, are perpendicular to the direction of movement and perpendicular to the direction normal to the surface of the metal strand offset from each other.
  • the correction coils viewed in the direction of movement of the metal strand, arranged in at least two rows, preferably in six rows. Furthermore, each row can have at least two correction coils.
  • the center of a correction coil in a subsequent row viewed in the direction of movement of the metal strand, is arranged exactly between two centers of the control coils of the preceding row.
  • the embodiment of the invention is achieved that due to the staggered arrangement of the correction coils from row to row (viewed in the direction of movement of the metal strand), the magnetic fields of traveling field coils for sealing the guide channel and the correction coils for controlling the band position in the guide channel overlap to a common field, the both seals and regulates. With the invention it is avoided that occur at the boundaries of the correction coils in a series field cancellations by canceling magnetic fields that would otherwise no longer make it possible to influence the metal strip in the guide channel for the purpose of its controlled positioning.
  • the induction fields are superimposed, and the unwanted effect of the field cancellation on the side is compensated for by the offset correction coil underneath.
  • the effect is no longer problematic, since the control range for the liquid column of the metal is in the upper half of the guide channel and thus does not bother.
  • At least one correction coil viewed in the direction of movement of the metal strand, is arranged at the same height as a main coil.
  • the electromagnetic inductor for receiving main coils and correction coils has a number of grooves which run perpendicular to the direction of movement of the metal strand and perpendicular to the normal direction. It can be advantageously provided that in each groove at least a part of at least one main coil and at least one correction coil is arranged. Furthermore, it has been found to be advantageous that the part of the correction coil arranged in the groove is arranged closer to the metal strand than the respective part of the main coil.
  • the supply of both the main coils and the correction coils with alternating current is of particular importance.
  • Means are provided, with which the main coils can be supplied with 3-phase alternating current. It is particularly advantageous if a total of six in the direction of movement of the metal strand successively arranged main coils are arranged (ie six rows), which are supplied with offset by 60 ° phased three-phase current.
  • the in-phase supply of the main and correction coils can preferably be a power supply with a pulse synchronization via optical fibers used.
  • Such a configuration of the device makes it possible for the correction coils to be operated in common mode with the traveling field.
  • the traveling field inductors usually three phases of a rotating field are used; for the correction coils, the respective one phase of the main coil, before which the correction coil is located, is sufficient.
  • the power supply of the two inductors on both sides of the metal strand can be used for the traveling field 3-phase frequency converter;
  • the correction coils one-phase frequency converters suffice, one for each correction coil.
  • An essential importance is the synchronization of the individual frequency converters. This is possible in a particularly simple manner with said impulse synchronization via optical waveguide, which is preferably recommended because of the strong magnetic fields and their stray fields.
  • the position of the continuous steel strip can be detected by induction field sensors, which are operated with a weak measuring field of preferably high frequency. For this purpose, a higher-frequency voltage with low power is superimposed on the traveling field tracks. The higher frequency voltage has no influence on the seal; In the same way, this does not lead to any heating of the coating metal or steel strip.
  • the higher-frequency induction can be filtered out of the strong signal of the normal seal and then provides a signal proportional to the distance from the sensor. With this, the position of the belt in the guide channel can be detected and regulated.
  • FIG. 1 shows the principle of hot-dip coating of a metal strand 1, in particular a steel strip.
  • the metal strand 1 to be coated enters vertically from below into the guide channel 4 of the coating installation.
  • the guide channel 4 forms the lower end of a container 3, which is filled with liquid coating metal 2.
  • the metal strand 1 is guided vertically upward in the direction of movement X. So that the liquid coating metal 2 can not leak from the container 3, an electromagnetic inductor is arranged in the region of the guide channel 4. This consists of two halves 5a and 5b, one of which is arranged laterally of the metal strand 1. In the electromagnetic inductor 5, an electromagnetic traveling field is generated, which retains the liquid coating metal 2 in the container 3 and thus prevents it from leaking.
  • the exact structure of the electromagnetic inductor 5 can be seen in Figures 2 and 3. Shown is only one of the two symmetrical inductors 5a, 5b, which are arranged on both sides of the metal strand 1. As shown in FIG. 2, the metal strand 1 moves upward in the direction of movement X past the inductor 5 a. To generate the electromagnetic traveling field, the inductor 5a is equipped with a total of six main coils 6. These extend over the entire width of the inductor 5a (see FIG. 3). The main coils 6 are arranged in grooves 10 which are incorporated in the metallic base body of the inductor 5a. To the right of Figure 2, the current directions are entered for a total of five line sections of the main coils 6, as they either emerge from the plane or enter into the drawing level.
  • correction coils 7 are arranged in the inductors 5a, 5b.
  • a plurality of correction coils 7 are positioned side-by-side in each of the six rows 8 ', 8 ", 8"', 8 "", 8 ""', 8 “””in two adjacent grooves 10 are arranged over the entire width of the inductor 5a extending main coil 6 and a plurality of juxtaposed correction coils 7.
  • FIG. 4 shows the phase sequence of the 3-phase three-phase current, as it is present in the six main coils 6 outlined.
  • the three phases are labeled R, S and T.
  • the phase sequence results in R, -T, S, -R, T, -S.
  • the respective correction coils 7 must be driven with the same phase present in the main coil 6, in front of which the correction coil 7 is arranged.
  • the main coils 6 for the generation of the traveling field are thus driven with three phases of a rotating field, while the correction coils 7 are each supplied with only one phase.
  • the realization of a supply of the coils 6 and 7 with phase-directed current is accomplished by means of suitable and well-known frequency converter. These must be synchronized accordingly, which is particularly suitable for pulse synchronization via optical fibers.

Landscapes

  • 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)
  • Glass Compositions (AREA)
  • General Induction Heating (AREA)

Abstract

The invention relates to a device for hot dip coating metal strand ( 1 ), particularly strip steel, in which the metal strand ( 1 ) can be vertically guided through a reservoir ( 3 ), which accommodates the molten coating metal ( 2 ), and though a guide channel ( 4 ) connected upstream therefrom. An electromagnetic inductor ( 5 ) is mounted in the area of the guide channel ( 4 ) and in order to retain the coating metal ( 2 ) inside the reservoir ( 3 ), can induce induction currents in the coating metal ( 2 ) by an electromagnetic traveling field. While interacting with the electromagnetic traveling field, the induction currents exert an electromagnetic force. The inductor ( 5 ) has at least two main coils ( 6 ) that are arranged in succession in movement direction (X) of the metal strand ( 1 ), and has at least two correction coils ( 7 ) for controlling the position of the metal strand ( 1 ) inside the guide channel ( 4 ) in direction (N), which is normal to the surface of the metal strand ( 1 ). These correction coils are also arranged in succession in movement direction (X) of the metal strand ( 1 ). In order to improve the efficiency of the control of the metal strip inside the guide channel, the invention provides that at least a portion of the correction coils ( 7 ), when viewed in movement direction (X) of the metal strand ( 1 ), are arranged so that they are offset with regard to one another perpendicular to movement direction (X) and perpendicular to direction (N) that is normal to the surface of the metal strand ( 1 ).

Description

Die Erfindung betrifft eine Vorrichtung zur Schmelztauchbeschichtung von Metallsträngen, insbesondere von Stahlband, in der der Metallstrang vertikal durch einen das geschmolzene Beschichtungsmetall aufnehmenden Behälter und durch einen vorgeschalteten Führungskanal hindurchführbar ist. Dabei ist im Bereich des Führungskanals ein elektromagnetischer Induktor angeordnet, der zum Zurückhalten des Beschichtungsmetalls im Behälter mittels eines elektromagnetischen Wanderfeldes im Beschichtungsmetall Induktionsströme induziert, die in Wechselwirkung mit dem elektromagnetischen Wanderfeld eine elektromagnetische Kraft ausüben, wobei der Induktor mindestens zwei Hauptspulen aufweist, die in Bewegungsrichtung des Metallstrangs aufeinanderfolgend angeordnet sind, sowie mindestens zwei Korrekturspulen zur Lageregelung des Metallstrangs im Führungskanal in Richtung normal zur Oberfläche des Metallstrangs besitzt, die ebenfalls in Bewegungsrichtung des Metallstrangs aufeinanderfolgend angeordnet sind.The invention relates to a device for hot-dip coating of metal strands, in particular of steel strip, in which the metal strand can be guided vertically through a container receiving the molten coating metal and through an upstream guide channel. In this case, an electromagnetic inductor is arranged in the region of the guide channel, which induces induction currents for retaining the coating metal in the container by means of an electromagnetic traveling field in the coating metal, which exert an electromagnetic force in interaction with the traveling electromagnetic field, wherein the inductor has at least two main coils in the direction of movement of the metal strand are arranged successively, as well as having at least two correction coils for position control of the metal strand in the guide channel in the direction normal to the surface of the metal strand, which are also arranged successively in the direction of movement of the metal strand.

Übliche 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 abrasiv entfernt werden, werden mit dem reduzierenden Wärmeprozess die Oberflächen so aktiviert, dass sie nach dem Wärmeprozess metallisch rein vorliegen.Conventional metal dip-coating systems for metal strips have a maintenance-intensive part, namely the coating vessel with the equipment located therein. The surfaces of the metal strips to be coated must be cleaned of oxide residues prior to coating and activated for connection to the coating metal. For this reason, the belt surfaces are treated in a reducing atmosphere prior to coating in heating processes. Since the oxide layers are previously removed chemically or abrasive, the reducing heat process activates the surfaces so 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 Prozesse jedoch eine Bandberührung bis zur vollständigen Erstarrung des Beschichtungsmetalls verbieten, muss das Band im Beschichtungsgefäß in die 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.With the activation of the strip surface but increases the affinity of these strip surfaces for the surrounding atmospheric oxygen. In order to prevent atmospheric oxygen from getting back to the belt surfaces before the coating process, the belts are introduced from above into the dip-coating bath in a plunger. However, since the coating metal is in liquid form and gravity is to be used with blowers to set the coating thickness, but subsequent processes prohibit tape contact until the coating metal solidifies completely, the tape in the coating vessel must be deflected in the vertical direction. This happens with a roller that runs in liquid metal. Due to the liquid coating metal, this roller 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, 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 coating thickness of the coating metal, which move in the micrometer range, high demands are placed on the quality of the strip surface. This means that the surfaces of the tape-guiding rollers also have to be of high quality. Disturbances on these surfaces generally lead to damage to the strip surface. This is another reason for frequent shutdowns of the plant.

Die bekannten Tauchbeschichtungsanlagen weisen zudem Grenzwerte in der Beschichtungsgeschwindigkeit auf. Es handelt sich dabei um die Grenzwerte beim Betrieb der Abstreifdüse, um die der Abkühlvorgänge des durchlaufenden Metallbandes und die des Wärmeprozesses zur Einstellung von Legierungsschichten im Beschichtungsmetall. Dadurch tritt der Fall auf, dass zum einen die Höchstgeschwindigkeit generell begrenzt ist und zum anderen bestimmte Metallbänder nicht mit der für die Anlage möglichen Höchstgeschwindigkeit gefahren werden können.The known dip coating systems also have limit values in the coating speed. These are the limit values for the operation of the wiping nozzle, the cooling processes of the continuous metal strip and the heating process for setting alloy layers in the coating metal. This leads to the case that on the one hand, the maximum speed is generally limited and on the other certain metal bands can not be driven at the maximum speed possible for the system.

Bei den Tauschbeschichtungsvorgängen finden Legierungsvorgänge für die Verbindung des Beschichtungsmetalls mit der Bandoberfläche statt. Die Eigenschaften und Dicken der sich dabei ausbildenden Legierungsschichten sind stark von der Temperatur im Beschichtungsgefäß abhängig. Aus diesem Grunde muss bei manchen Beschichtungsvorgängen das Beschichtungsmetall zwar flüssig gehalten werden, aber die Temperatur darf bestimmte Grenzwerte nicht überschreiten. Dies läuft dem gewünschten Effekt des Abstreifens des Beschichtungsmetalls zur Einstellung einer bestimmten Beschichtungsdicke entgegen, da mit fallender Temperatur die für den Abstreifvorgang erforderliche Viskosität des Beschichtungsmetalls ansteigt und damit den Abstreifvorgang erschwert.In the exchange coating operations, alloying operations for the bonding of the coating metal to the strip surface take place. The properties and thicknesses of the thereby forming alloy layers are highly dependent on the temperature in the coating vessel. For this reason, the coating metal must be kept liquid in some coating operations, but the temperature must not exceed certain limits. This counteracts the desired effect of stripping the coating metal to set a specific coating thickness, since with decreasing temperature increases the required for the stripping viscosity of the coating metal and thus complicates the stripping process.

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 unteren Bereich einen Führungskanal zur vertikalen Banddurchführung nach oben aufweist, und zur Abdichtung einen elektromagnetischen Verschluss vorzusehen. Es handelt sich hierbei um elektromagnetische Induktoren, die mit zurückdrängenden, pumpenden bzw. einschnürenden elektromagnetischen Wechsel- bzw. Wanderfeldern arbeiten, die das Beschichtungsgefäß nach unten abdichten.In order to avoid the problems associated with the rollers running in the liquid coating metal, there have been attempts to use a downwardly open coating vessel having a guide channel for vertical tape feed-through in its lower portion and an electromagnetic seal for sealing Provide closure. These are electromagnetic inducers that work with backward, pumping or constricting electromagnetic alternating or traveling fields that seal the coating vessel down.

Eine solche Lösung ist beispielsweise aus der EP 0 673 444 B1 bekannt. Einen elektromagnetischen Verschluss zur Abdichtung des Beschichtungsgefäßes nach unten sieht auch die Lösung gemäß der WO 96/03533 bzw. diejenige gemäß der JP 5086446 vor.Such a solution is known, for example, from EP 0 673 444 B1. An electromagnetic closure for sealing the coating vessel downwards is also provided by the solution according to WO 96/03533 or that according to JP 5086446.

Die Beschichtung von nicht ferromagnetischen Metallbändern wird damit zwar möglich, jedoch treten bei im wesentlichen ferromagnetischen Stahlbändern damit Probleme auf, dass diese in den elektromagnetischen Abdichtungen durch den Ferromagnetismus an die Kanalwände gezogen werden, wodurch die Bandoberfläche beschädigt wird. Weiterhin ist es problematisch, dass das Beschichtungsmetall durch die induktiven Felder unzulässig erwärmt wird.The coating of non-ferromagnetic metal tapes is indeed possible, but there are problems with substantially ferromagnetic steel strips that they are drawn in the electromagnetic seals by the ferromagnetism to the channel walls, whereby the tape surface is damaged. Furthermore, it is problematic that the coating metal is heated by the inductive fields inadmissible.

Bei der Lage des durchlaufenden ferromagnetischen Stahlbandes durch den Führungskanal zwischen zwei Wanderfeldinduktoren handelt es sich um ein labiles Gleichgewicht. Nur in der Mitte des Führungskanals ist die Summe der auf das Band wirkenden magnetischen Anziehungskräfte Null. Sobald das Stahlband aus seiner Mittenlage ausgelenkt wird, gerät es näher an einen der beiden Induktoren, während es sich vom anderen Induktor entfernt. Ursachen für eine solche Auslenkung können einfache Planlagefehler des Bandes sein. Zu nennen sind dabei jegliche Art von Bandwellen in Laufrichtung, gesehen über die Breite des Bandes (Centerbuckles, Quarterbuckles, Randwellen, Flattern, Verdrehen, Crossbow, S-Form etc.). Die magnetische Induktion, die für die magnetische Anziehungskraft verantwortlich ist, nimmt gemäß einer Expotentialfunktion mit dem Abstand vom Induktor in ihrer Feldstärke ab. In ähnlicher Weise nimmt daher die Anziehungskraft mit dem Quadrat der Induktionsfeldstärke mit wachsendem Abstand vom Induktor ab. Für das ausgelenkte Band bedeutet das, dass mit der Auslenkung in die eine Richtung die Anziehungskraft zum einen Induktor expotentiell ansteigt, während die rückholende Kraft vom anderen Induktor expotentiell abnimmt. Beide Effekte verstärken sich von selbst, so dass das Gleichgewicht labil ist.The position of the passing ferromagnetic steel strip through the guide channel between two traveling field inductors is an unstable equilibrium. Only in the middle of the guide channel is the sum of the magnetic forces of attraction acting on the tape zero. As soon as the steel strip is deflected from its center position, it gets closer to one of the two inductors, while it moves away from the other inductor. Causes of such a deflection may be simple flatness errors of the tape. To call it are any kind of tape waves in the direction, seen across the width of the band (Centerbuckles, Quarterbuckles, edge waves, flutter, twisting, crossbow, S-shape, etc.). The magnetic induction, which is responsible for the magnetic attraction decreases according to an exponential function with the distance from the inductor in their field strength. Similarly, the attraction force decreases with the square of the induction field strength with increasing distance from the inductor. For the deflected band, this means that with the deflection in one direction, the attractive force to one inductor expands exponentially, while the restoring force from the other inductor exponentially decreases. Both effects are self-reinforcing, so the balance is unstable.

Zur Lösung dieses Problems, d.h. zur genauen Lageregelung des Metallstrangs im Führungskanal, geben die DE 195 35 854 A1 und die DE 100 14 867 A1 Hinweise. Gemäß den dort offenbarten Konzepten sind neben den Spulen zur Erzeugung des elektromagnetischen Wanderfeldes zusätzliche Korrekturspulen vorgesehen, die mit einem Regelungssystem in Verbindung stehen und dafür Sorge tragen, dass das Metallband beim Abweichen von der Mittellage in diese wieder zurückgeholt wird.To solve this problem, i. for precise position control of the metal strand in the guide channel, DE 195 35 854 A1 and DE 100 14 867 A1 give hints. According to the concepts disclosed therein additional correction coils are provided in addition to the coils for generating the electromagnetic traveling field, which are in communication with a control system and ensure that the metal strip is retrieved when departing from the central position in this.

Bei diesen vorbekannten Lösungsansätzen hat es sich als nachteilhaft herausgestellt, dass die Regelung des Metallbandes zum Halten des Bandes in der Mitte des Führungskanals dadurch schwierig wird, dass es mitunter aufgrund von Überlagerungen der Magnetfelder von Haupt- und Korrekturspulen zu Feldauslöschungen kommt und daher eine effiziente Rückholung des Metallbandes in die Mitte des Führungskanals schwierig bzw. unmöglich wird. Eine Untersuchung der Widerstandskräfte des Stahlbandes ergab, dass mit dünner werdendem Band, was dem heutigen Trend entspricht, die Eigensteifigkeit des Stahlbandes soweit zurückgeht, dass es einer Deformation aufgrund des Magnetfelds der Induktoren nur wenig Widerstand entgegensetzen kann. Problematisch ist in diesem Zusammenhang die große Abspannlänge zwischen der unteren Umlenkrolle unter dem Führungskanal und der oberen Umlenkrolle über dem Beschichtungsbad, die in einer Produktionsanlage deutlich über 20 m liegen kann. Dies verstärkt die Notwendigkeit einer effizienten Positionsregelung des Metallbandes im Führungskanal, was durch die obengenannten Umstände schwierig ist.In these previously known approaches, it has been found to be disadvantageous that the control of the metal band for holding the band in the middle of the guide channel is difficult in that it sometimes comes to field cancellations due to superpositions of magnetic fields of main and correction coils and therefore an efficient retrieval of the metal band in the middle of the guide channel difficult or impossible. An examination of the resistance forces of the steel strip showed that with thinning tape, which corresponds to the current trend, the inherent rigidity of the steel strip goes back so far that it can only resist a deformation due to the magnetic field of the inductors little. The problem in this context is the large guy length between the lower deflection roller below the guide channel and the upper deflection roller above the coating bath, which can be well over 20 m in a production plant. This enhances the need for efficient position control of the metal strip in the guide channel, which is difficult due to the above-mentioned circumstances.

Der Erfindung liegt daher die Aufgabe zugrunde, eine Vorrichtung zur Schmelztauchbeschichtung von Metallsträngen der eingangs genannten Art derart weiterzuentwickeln, dass die genannten Nachteile überwunden werden. Es soll insbesondere möglich sein, wirkungsvoll das Metallband in der Mitte des Führungskanals zu halten.The invention is therefore based on the object, a device for hot dip coating of metal strands of the type mentioned in such a way that the mentioned disadvantages are overcome. It should be possible in particular to effectively hold the metal strip in the middle of the guide channel.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, dass zumindest ein Teil der Korrekturspulen, in Bewegungsrichtung des Metallstrangs betrachtet, senkrecht zur Bewegungsrichtung und senkrecht zur Richtung normal zur Oberfläche des Metallstrangs zueinander versetzt angeordnet sind.This object is achieved in that at least a portion of the correction coils, viewed in the direction of movement of the metal strand, are perpendicular to the direction of movement and perpendicular to the direction normal to the surface of the metal strand offset from each other.

Bevorzugt sind die Korrekturspulen, in Bewegungsrichtung des Metallstrangs betrachtet, in mindestens zwei Reihen, vorzugsweise in sechs Reihen, angeordnet. Ferner kann jede Reihe mindestens zwei Korrekturspulen aufweisen. Mit Vorteil ist weiterhin vorgesehen, dass die Mitte einer Korrekturspule in einer nachfolgenden Reihe, in Bewegungsrichtung des Metallstrangs betrachtet, genau zwischen zwei Mitten der Kontrollspulen der vorangehenden Reihe angeordnet ist.Preferably, the correction coils, viewed in the direction of movement of the metal strand, arranged in at least two rows, preferably in six rows. Furthermore, each row can have at least two correction coils. Advantageously, it is further provided that the center of a correction coil in a subsequent row, viewed in the direction of movement of the metal strand, is arranged exactly between two centers of the control coils of the preceding row.

Mit der erfindungsgemäßen Ausgestaltung wird erreicht, dass aufgrund der versetzten Anordnung der Korrekturspulen von Reihe zu Reihe (in Bewegungsrichtung des Metallstrangs betrachtet) die Magnetfelder von Wanderfeldspulen zur Abdichtung des Führungskanals und der Korrekturspulen zur Regelung der Bandlage im Führungskanal sich zu einem gemeinsamen Feld überlagern, das sowohl abdichtet als auch regelt. Mit der Erfindung wird vermieden, daß an den Grenzen der Korrekturspulen in einer Reihe Feldauslöschungen durch sich aufhebende Magnetfelder auftreten, die ansonsten eine Einflussnahme auf das Metallband im Führungskanal zwecks dessen geregelter Positionierung nicht mehr möglich machen würden.With the embodiment of the invention is achieved that due to the staggered arrangement of the correction coils from row to row (viewed in the direction of movement of the metal strand), the magnetic fields of traveling field coils for sealing the guide channel and the correction coils for controlling the band position in the guide channel overlap to a common field, the both seals and regulates. With the invention it is avoided that occur at the boundaries of the correction coils in a series field cancellations by canceling magnetic fields that would otherwise no longer make it possible to influence the metal strip in the guide channel for the purpose of its controlled positioning.

Bei der erfindungsgemäß vorgesehenen Anordnung überlagern sich die Induktionsfelder, und der unerwünschte Effekt der Feldauslöschung an der Seite wird durch die versetzt darunter befindliche Korrekturspule ausgeglichen. An der Unterseite der Induktoren ist der Effekt nicht mehr problematisch, da sich der Regelbereich für die Flüssigkeitssäule des Metalls in der oberen Hälfte des Führungskanals befindet und damit hier nicht mehr stört.In the arrangement provided according to the invention, the induction fields are superimposed, and the unwanted effect of the field cancellation on the side is compensated for by the offset correction coil underneath. At the bottom of the inductors, the effect is no longer problematic, since the control range for the liquid column of the metal is in the upper half of the guide channel and thus does not bother.

Gemäß einer Fortbildung ist vorgesehen, dass jeweils mindestens eine Korrekturspule, in Bewegungsrichtung des Metallstrangs betrachtet, in derselben Höhe wie eine Hauptspule angeordnet ist. Weiterhin kann vorgesehen werden, dass der elektromagnetische Induktor für die Aufnahme von Hauptspulen und Korrekturspulen eine Anzahl Nuten aufweist, die senkrecht zur Bewegungsrichtung des Metallstrangs und senkrecht zur normalen Richtung verlaufen. Dabei kann vorteilhaft vorgesehen werden, dass in jeder Nut zumindest ein Teil mindestens einer Hauptspule und mindestens einer Korrekturspule angeordnet ist. Ferner hat es sich als vorteilhaft herausgestellt, dass der in der Nut angeordnete Teil der Korrekturspule näher am Metallstrang angeordnet ist als der jeweilige Teil der Hauptspule.According to a further development, it is provided that in each case at least one correction coil, viewed in the direction of movement of the metal strand, is arranged at the same height as a main coil. Furthermore, it can be provided that the electromagnetic inductor for receiving main coils and correction coils has a number of grooves which run perpendicular to the direction of movement of the metal strand and perpendicular to the normal direction. It can be advantageously provided that in each groove at least a part of at least one main coil and at least one correction coil is arranged. Furthermore, it has been found to be advantageous that the part of the correction coil arranged in the groove is arranged closer to the metal strand than the respective part of the main coil.

Der Versorgung sowohl der Hauptspulen als auch der Korrekturspulen mit Wechselstrom kommt eine besondere Bedeutung zu. Hierzu sind bevorzugt Mittel vorgesehen, mit denen die Hauptspulen mit 3-Phasen-Wechselstrom versorgt werden können. Besonders vorteilhaft ist, wenn insgesamt sechs in Bewegungsrichtung des Metallstrangs aufeinanderfolgend angeordnete Hauptspulen angeordnet sind (also sechs Reihen), die mit jeweils um 60° versetzt gephastem Drehstrom versorgt werden.The supply of both the main coils and the correction coils with alternating current is of particular importance. For this purpose are preferred Means are provided, with which the main coils can be supplied with 3-phase alternating current. It is particularly advantageous if a total of six in the direction of movement of the metal strand successively arranged main coils are arranged (ie six rows), which are supplied with offset by 60 ° phased three-phase current.

Weiterhin wird vorgeschlagen, dass Mittel zum Einsatz kommen, mit denen die Korrekturspulen mit einem Wechselstrom versorgt werden, der dieselbe Phase aufweist wie derjenige Strom, mit dem die örtlich benachbarte Hauptspule betrieben wird.Furthermore, it is proposed that means be used, with which the correction coils are supplied with an alternating current having the same phase as the current with which the locally adjacent main coil is operated.

Zur phasenrichtigen Versorgung der Haupt- und Korrekturspulen kann bevorzugt eine Stromversorgung mit einer Impuls-Synchronisation über Lichtwellenleiter zum Einsatz kommen.For the in-phase supply of the main and correction coils can preferably be a power supply with a pulse synchronization via optical fibers used.

Eine derartige Ausgestaltung der Vorrichtung ermöglicht es, dass sich die Korrekturspulen im Gleichtakt mit dem Wanderfeld betreiben lassen. Für die Wanderfeldinduktoren werden meist drei Phasen eines Drehfeldes eingesetzt; für die Korrekturspulen reicht die jeweilige eine Phase der Hauptspule aus, vor der sich die Korrekturspule befindet. Für die Leistungsversorgung der beiden Induktoren beidseits des Metallstrangs können für das Wanderfeld 3-Phasen-Frequenzumrichter verwendet werden; für die Korrekturspulen genügen 1-Phasen-Frequenzumrichter, und zwar für jede Korrekturspule einer. Eine wesentliche Bedeutung hat dabei die Synchronisation der einzelnen Frequenzumrichter. Diese ist in besonders einfacher Weise mit der genannten Impuls-Synchronisation über Lichtwellenleiter möglich, die sich wegen der starken Magnetfelder sowie deren Streufelder bevorzugt empfiehlt.Such a configuration of the device makes it possible for the correction coils to be operated in common mode with the traveling field. For the traveling field inductors usually three phases of a rotating field are used; for the correction coils, the respective one phase of the main coil, before which the correction coil is located, is sufficient. For the power supply of the two inductors on both sides of the metal strand can be used for the traveling field 3-phase frequency converter; For the correction coils, one-phase frequency converters suffice, one for each correction coil. An essential importance is the synchronization of the individual frequency converters. This is possible in a particularly simple manner with said impulse synchronization via optical waveguide, which is preferably recommended because of the strong magnetic fields and their stray fields.

Die Lage des durchlaufenden Stahlbandes kann durch Induktionsfeldsensoren erfasst werden, die mit einem schwachen Messfeld von vorzugsweise hoher Frequenz betrieben werden. Dazu wird eine höherfrequente Spannung mit geringer Leistung den Wanderfeldspuren überlagert. Die höherfrequente Spannung hat keinen Einfluss auf die Abdichtung; in gleicher Weise kommt es hierdurch zu keiner Aufheizung des Beschichtungsmetalls bzw. Stahlbands. Die höherfrequente Induktion lässt sich aus dem kräftigen Signal der normalen Abdichtung herausfiltern und liefert dann ein dem Abstand vom Sensor proportionales Signal. Mit diesem kann die Lage des Bandes im Führungskanal erfasst und geregelt werden.The position of the continuous steel strip can be detected by induction field sensors, which are operated with a weak measuring field of preferably high frequency. For this purpose, a higher-frequency voltage with low power is superimposed on the traveling field tracks. The higher frequency voltage has no influence on the seal; In the same way, this does not lead to any heating of the coating metal or steel strip. The higher-frequency induction can be filtered out of the strong signal of the normal seal and then provides a signal proportional to the distance from the sensor. With this, the position of the belt in the guide channel can be detected and regulated.

Untersuchungen zur Eigensteifigkeit des Metallstrangs erbrachten mit der vorgeschlagenen Ausgestaltung der Korrekturspulen eine deutliche Verbesserung der Regelfähigkeit des Metallbands. Das Band hat dadurch im Bereich der Induktoren keine langen Abspannlängen mehr und damit ausreichende Eigensteifigkeit für die Regelung der Bandlage im Führungskanal beim Durchlauf.Studies on the inherent rigidity of the metal strand provided with the proposed embodiment of the correction coils a significant improvement in the control ability of the metal strip. As a result, the strip no longer has long guy lengths in the area of the inductors and thus sufficient inherent rigidity for the regulation of the band position in the guide channel during the passage.

In der Zeichnung ist ein Ausführungsbeispiel der Erfindung dargestellt.
Es zeigen:

Figur 1
schematisch ein Schmelztauch-Beschichtungsgefäß mit einem durch dieses hindurch geführten Metallstrang;
Figur 2
die Vorderansicht eines elektromagnetischen Induktors, der an der Unterseite des Schmelztauch-Beschichtungsbehälters angeordnet ist;
Figur 3
die zu Figur 2 zugehörige Seitenansicht des elektromagnetischen Induktors; und
Figur 4
die Phasenfolge des elektromagnetischen Wanderfelds, das durch den elektromagnetischen Induktor erzeugt wird.
In the drawing, an embodiment of the invention is shown.
Show it:
FIG. 1
schematically a hot dip coating vessel with a guided through this metal strand;
FIG. 2
the front view of an electromagnetic inductor, which is arranged on the underside of the hot-dip coating container;
FIG. 3
the associated to Figure 2 side view of the electromagnetic inductor; and
FIG. 4
the phase sequence of the traveling electromagnetic field generated by the electromagnetic inductor.

In Figur 1 ist das Prinzip der Schmelztauch-Beschichtung eines Metallstrangs 1, insbesondere eines Stahlbands, gezeigt. Der zu beschichtende Metallstrang 1 tritt vertikal von unten in den Führungskanal 4 der Beschichtungsanlage ein.FIG. 1 shows the principle of hot-dip coating of a metal strand 1, in particular a steel strip. The metal strand 1 to be coated enters vertically from below into the guide channel 4 of the coating installation.

Der Führungskanal 4 bildet das untere Ende eines Behälters 3, das mit flüssigem Beschichtungsmetall 2 gefüllt ist. Der Metallstrang 1 wird in Bewegungsrichtung X vertikal nach oben geführt. Damit das flüssige Beschichtungsmetall 2 nicht aus dem Behälter 3 auslaufen kann, ist im Bereich des Führungskanals 4 ein elektromagnetischer Induktor angeordnet. Dieser besteht aus zwei Hälften 5a und 5b, von denen jeweils eine seitlich des Metallstrangs 1 angeordnet ist. Im elektromagnetischen Induktor 5 wird ein elektromagnetisches Wanderfeld erzeugt, das das flüssige Beschichtungsmetall 2 im Behälter 3 zurückhält und so am Auslaufen hindert.The guide channel 4 forms the lower end of a container 3, which is filled with liquid coating metal 2. The metal strand 1 is guided vertically upward in the direction of movement X. So that the liquid coating metal 2 can not leak from the container 3, an electromagnetic inductor is arranged in the region of the guide channel 4. This consists of two halves 5a and 5b, one of which is arranged laterally of the metal strand 1. In the electromagnetic inductor 5, an electromagnetic traveling field is generated, which retains the liquid coating metal 2 in the container 3 and thus prevents it from leaking.

Der genaue Aufbau des elektromagnetischen Induktors 5 ist in Figur 2 und 3 zu erkennen. Dargestellt ist nur einer der beiden symmetrisch ausgebildeten Induktoren 5a, 5b, die beidseits des Metallstrangs 1 angeordnet sind. Wie in Figur 2 dargestellt, bewegt sich der Metallstrang 1 in Bewegungsrichtung X am Induktor 5a vorbei nach oben. Zur Erzeugung des elektromagnetischen Wanderfeldes ist der Induktor 5a mit insgesamt sechs Hauptspulen 6 ausgestattet. Diese verlaufen über die gesamte Breite des Induktors 5a (siehe Figur 3). Die Hauptspulen 6 sind in Nuten 10 angeordnet, die in den metallischen Grundkörper des Induktors 5a eingearbeitet sind. Rechts neben Figur 2 sind für insgesamt fünf Leitungsabschnitte der Hauptspulen 6 die Stromrichtungen eingetragen, wie sie entweder aus der Zeichenebene heraus austreten bzw. in die Zeichenebene hinein eintreten.The exact structure of the electromagnetic inductor 5 can be seen in Figures 2 and 3. Shown is only one of the two symmetrical inductors 5a, 5b, which are arranged on both sides of the metal strand 1. As shown in FIG. 2, the metal strand 1 moves upward in the direction of movement X past the inductor 5 a. To generate the electromagnetic traveling field, the inductor 5a is equipped with a total of six main coils 6. These extend over the entire width of the inductor 5a (see FIG. 3). The main coils 6 are arranged in grooves 10 which are incorporated in the metallic base body of the inductor 5a. To the right of Figure 2, the current directions are entered for a total of five line sections of the main coils 6, as they either emerge from the plane or enter into the drawing level.

Damit der Metallstrang 1 in Richtung N normal zur Oberfläche des Strangs 1 (siehe Figur 2 und Figur 3) exakt zentrisch im Führungskanal 4 gehalten werden kann, ohne an die Induktoren 5a, 5b anzustoßen, sind Korrekturspulen 7 in den Induktoren 5a, 5b angeordnet. Wie insbesondere in Figur 3 gesehen werden kann, sind mehrere Korrekturspulen 7 nebeneinander in jeder der insgesamt sechs Reihen 8', 8", 8"', 8"", 8""', 8""" positioniert. In zwei benachbarten Nuten 10 sind die sich über die gesamte Breite des Induktors 5a erstreckende Hauptspule 6 sowie mehrere nebeneinander positionierte Korrekturspulen 7 angeordnet.Thus, the metal strand 1 in the direction N normal to the surface of the strand 1 (see Figure 2 and Figure 3) can be kept exactly centered in the guide channel 4 without abutting the inductors 5a, 5b, correction coils 7 are arranged in the inductors 5a, 5b. As can be seen in particular in Figure 3, a plurality of correction coils 7 are positioned side-by-side in each of the six rows 8 ', 8 ", 8"', 8 "", 8 ""', 8 """in two adjacent grooves 10 are arranged over the entire width of the inductor 5a extending main coil 6 and a plurality of juxtaposed correction coils 7.

Wie Figur 3 entnommen werden kann, ist dabei vorgesehen, dass die Korrekturspulen 7 zweier aufeinander folgender Reihen 8', 8", 8"', 8"", 8""', 8""" zueinander versetzt angeordnet sind. Die Mitte der Korrekturspuren 7 ist mit 9 bezeichnet. Wie aus Figur 3, unten rechts, hervorgeht, sind die Abstände a und b gleich, die den Betrag des Versatzes der Korrekturspulen 7 zueinander angeben. Mit dieser Ausgestaltung wird erreicht, dass sich die von den Korrekturspulen 7 erzeugten Magnetfelder, die den Metallstrang 1 im Führungskanal 4 regeln, nicht gegenseitig auslöschen können. Eine effiziente Regelung wird möglich.3, it is provided that the correction coils 7 of two successive rows 8 ', 8 ", 8"', 8 "", 8 "" ', 8 "" "are arranged offset from one another Correction traces 7 are denoted by 9. As shown in Fig. 3, bottom right, the distances a and b are equal to each other, which indicate the amount of offset of the correction coils 7. With this configuration, it is achieved that those generated by the correction coils 7 Magnetic fields that control the metal strand 1 in the guide channel 4, can not cancel each other out.

In Figur 4 ist die Phasenfolge des 3-Phasen-Drehstroms dargestellt, wie er in den sechs skizzierten Hauptspulen 6 vorliegt. Die drei Phasen sind mit R, S und T bezeichnet. Die Phasenfolge ergibt sich zu R, -T, S, -R, T, -S.FIG. 4 shows the phase sequence of the 3-phase three-phase current, as it is present in the six main coils 6 outlined. The three phases are labeled R, S and T. The phase sequence results in R, -T, S, -R, T, -S.

Die jeweiligen Korrekturspulen 7 müssen mit der gleichen Phase angesteuert werden, die in der Hauptspule 6 vorliegt, vor der die Korrekturspule 7 angeordnet ist. Die Hauptspulen 6 für die Erzeugung des Wanderfeldes werden also mit drei Phasen eines Drehfeldes angesteuert, während die Korrekturspulen 7 jeweils nur mit einer Phase versorgt werden. Die Realisierung einer Versorgung der Spulen 6 und 7 mit phasengenau gerichtetem Strom wird mittels geeigneter und hinlänglich bekannter Frequenzumrichter bewerkstelligt. Diese müssen entsprechend synchronisiert werden, wozu sich insbesondere eine Impuls-Synchronisation über Lichtwellenleiter eignet.The respective correction coils 7 must be driven with the same phase present in the main coil 6, in front of which the correction coil 7 is arranged. The main coils 6 for the generation of the traveling field are thus driven with three phases of a rotating field, while the correction coils 7 are each supplied with only one phase. The realization of a supply of the coils 6 and 7 with phase-directed current is accomplished by means of suitable and well-known frequency converter. These must be synchronized accordingly, which is particularly suitable for pulse synchronization via optical fibers.

Bezugszeichenliste:LIST OF REFERENCE NUMBERS

11
Metallstrang (Stahlband)Metal strand (steel strip)
22
Beschichtungsmetallcoating metal
33
Behältercontainer
44
Führungskanalguide channel
5, 5a, 5b5, 5a, 5b
elektromagnetischer Induktorelectromagnetic inductor
66
Hauptspulemain coil
77
Korrekturspulecorrection coil
8', 8", 8"', 8"',8 ', 8 ", 8"', 8 "',
8""' 8"""8 "" '8 "" "
Reihenstring
99
Mitte einer Korrekturspule 7Center of a correction coil 7
1010
Nutgroove
XX
Bewegungsrichtungmovement direction
NN
normale Richtungnormal direction
aa
Abstand der Mitten 9Distance between centers 9
bb
Abstand der Mitten 9Distance between centers 9
RR
Phase des DrehstromsPhase of the three-phase current
SS
Phase des DrehstromsPhase of the three-phase current
TT
Phase des DrehstromsPhase of the three-phase current

Claims (12)

  1. Device for immersion dip coating of metal strips (1), especially of steel strip, in which the metal strip (1) can be vertically led through a container (3), which receives the molten coating metal (2), and an upstream guide channel (4), wherein arranged in the region of the guide channel (4) is an electromagnetic inductor (5) which for retention of the coating metal (2) in the container (3) by means of an electromagnetic travelling field in the coating metal (2) can induce induction currents which exert an electromagnetic force in interaction with the electromagnetic travelling field and wherein the inductor (5) comprises at least two main coils (6), which are arranged one above the other in the direction of movement (X) of the metal strip (1), as well as has at least two correction coils (7) for positional regulation of the metal strip (1) in the guide channel (4) in direction (N) normal surface of the metal strip (1), which correction coils are similarly arranged one above the other in movement direction (X) of the metal strip (1), characterised in that at least a part of the correction coils (7) as considered in movement direction (X) of the metal strip (1) are arranged to be offset relative to one another perpendicularly to the movement direction (X) and perpendicularly to the direction (N) normal to the surface of the metal strip (1).
  2. Device according to claim 1, characterised in that the correction coils (7) as considered in movement direction (X) of the metal strip (1) are arranged in at least two rows (8', 8", 8"', 8"", 8""', 8"""), preferably in six rows.
  3. Device according to claim 2, characterised in that each row (8', 8", 8"', 8"", 8""', 8""") has at least two correction coils (7).
  4. Device according to claim 3, characterised in that the centre (9) of a correction coil (7) as considered in a succeeding row (8") in movement direction (X) of the metal strip (1) is arranged between two centres (9) of the correction coils (7) of the preceding row (8').
  5. Device according to one of claims 1 to 4, characterised in that in each instance at least one correction coil (7) as considered in the movement direction (X) of the metal strip (1) is arranged at the same height as a main coil (6).
  6. Device according to one of claims 1 to 5, characterised in that the electromagnetic inductor (5) has, for reception of main coils (6) and correction coils (7), a plurality of grooves (10) extending perpendicularly to the movement direction (X) of the metal strip (1) and perpendicularly to the normal direction (N).
  7. Device according to claim 6, characterised in that at least a part of at least one main coil (6) and at least one correction coil (7) is arranged in each groove.
  8. Device according to claim 7, characterised in that the part of the correction coil (7) arranged in the groove (10) is disposed closer to the metal strip (1) than the respective part of the main coil (6).
  9. Device according to one of claims 1 to 8, characterised by means for supply of the main coils (6) with three-phase alternating current.
  10. Device according to claim 9, characterised in that in total six main coils (6) arranged one above the other in movement direction (X) of the metal strip (1) are arranged, which coils are respectively supplied with three-phase current phased to be displaced by 60°.
  11. Device according to claim 9 or 10, characterised by means for supply of the correction coils (7) with an alternating current which has the same phase as the current supplying the locally adjacent main coil (6).
  12. Device according to claim 11, characterised in that the means for supply of the main coils (6) and the correction coils (7) with alternating current comprises a device for pulse synchronisation by way of optical conductors.
EP03743812A 2002-03-09 2003-02-20 Device for hot dip coating metal strands Expired - Lifetime EP1483424B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10210429A DE10210429A1 (en) 2002-03-09 2002-03-09 Device for hot dip coating of metal strands
DE10210429 2002-03-09
PCT/EP2003/001722 WO2003076681A1 (en) 2002-03-09 2003-02-20 Device for hot dip coating metal strands

Publications (2)

Publication Number Publication Date
EP1483424A1 EP1483424A1 (en) 2004-12-08
EP1483424B1 true EP1483424B1 (en) 2006-05-31

Family

ID=27762823

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03743812A Expired - Lifetime EP1483424B1 (en) 2002-03-09 2003-02-20 Device for hot dip coating metal strands

Country Status (19)

Country Link
US (1) US6929697B2 (en)
EP (1) EP1483424B1 (en)
JP (1) JP4382495B2 (en)
KR (1) KR100941623B1 (en)
CN (1) CN100436637C (en)
AT (1) ATE328134T1 (en)
AU (1) AU2003210320B2 (en)
BR (1) BR0307201A (en)
CA (1) CA2474275C (en)
DE (2) DE10210429A1 (en)
ES (1) ES2263008T3 (en)
MX (1) MXPA04008698A (en)
PL (1) PL205346B1 (en)
RO (1) RO120776B1 (en)
RS (1) RS50748B (en)
RU (1) RU2309193C2 (en)
UA (1) UA79112C2 (en)
WO (1) WO2003076681A1 (en)
ZA (1) ZA200404643B (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10210430A1 (en) * 2002-03-09 2003-09-18 Sms Demag Ag Device for hot dip coating of metal strands
PL376865A1 (en) * 2003-02-27 2006-01-09 Sms Demag Aktiengesellschaft Method and device for melt dip coating metal strips, especially steel strips
DE10312939A1 (en) * 2003-02-27 2004-09-09 Sms Demag Ag Method and device for hot-dip coating of metal strips, in particular steel strips
DE102005014878A1 (en) * 2005-03-30 2006-10-05 Sms Demag Ag Method and apparatus for hot dip coating a metal strip
CN111926278B (en) * 2020-09-24 2021-01-08 华中科技大学 Three-phase electromagnetic wiping device for strip-shaped workpiece and hot dip coating system

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IN191638B (en) * 1994-07-28 2003-12-06 Bhp Steel Jla Pty Ltd
US6106620A (en) * 1995-07-26 2000-08-22 Bhp Steel (Jla) Pty Ltd. Electro-magnetic plugging means for hot dip coating pot
DE19535854C2 (en) * 1995-09-18 1997-12-11 Mannesmann Ag Process for strip stabilization in a plant for coating strip-like material
JPH1046310A (en) * 1996-07-26 1998-02-17 Nisshin Steel Co Ltd Hot dip coating method without using sinkroll and coating device
CA2225537C (en) * 1996-12-27 2001-05-15 Mitsubishi Heavy Industries, Ltd. Hot dip coating apparatus and method
US6037011A (en) * 1997-11-04 2000-03-14 Inland Steel Company Hot dip coating employing a plug of chilled coating metal
DE10014867A1 (en) * 2000-03-24 2001-09-27 Sms Demag Ag Process for the hot dip galvanizing of steel strips comprises continuously correcting the electrochemical field vertically to the surface of the strip to stabilize a middle

Also Published As

Publication number Publication date
DE10210429A1 (en) 2003-09-18
EP1483424A1 (en) 2004-12-08
ES2263008T3 (en) 2006-12-01
ATE328134T1 (en) 2006-06-15
CN100436637C (en) 2008-11-26
DE50303578D1 (en) 2006-07-06
RO120776B1 (en) 2006-07-28
BR0307201A (en) 2004-11-03
RU2309193C2 (en) 2007-10-27
ZA200404643B (en) 2005-02-10
KR100941623B1 (en) 2010-02-11
MXPA04008698A (en) 2005-07-13
KR20040090993A (en) 2004-10-27
PL370504A1 (en) 2005-05-30
AU2003210320A1 (en) 2003-09-22
RU2004129776A (en) 2005-06-10
US6929697B2 (en) 2005-08-16
CN1639379A (en) 2005-07-13
CA2474275A1 (en) 2003-09-18
JP4382495B2 (en) 2009-12-16
YU79704A (en) 2006-03-03
RS50748B (en) 2010-08-31
CA2474275C (en) 2010-08-17
PL205346B1 (en) 2010-04-30
AU2003210320B2 (en) 2008-07-31
WO2003076681A1 (en) 2003-09-18
JP2005525466A (en) 2005-08-25
UA79112C2 (en) 2007-05-25
US20050076835A1 (en) 2005-04-14

Similar Documents

Publication Publication Date Title
WO1994013850A1 (en) Process and device for coating the surface of strip material
DE102005014878A1 (en) Method and apparatus for hot dip coating a metal strip
EP1483424B1 (en) Device for hot dip coating metal strands
EP1483423B1 (en) Device for hot dip coating metal strands
EP0254020B1 (en) Inductive heater for heating the edges of elongated moving workpieces
DE2612153A1 (en) DEVICE FOR CONTINUOUS HEATING OF MOVING METAL RAILS OR STRIPS, IN PARTICULAR OF STRIP STEEL
EP1565590B1 (en) Method and device for hot-dip coating a metal strand
EP0302057A1 (en) Process and device for the surface treatment of strips with fluids.
DE19629026C2 (en) Process for winding an electrical steel strip into a large coil
EP0721813A1 (en) Device for guiding hot-rolled strip through an inductor
DE1963529B2 (en) DEVICE FOR PROMOTING ELECTRICALLY CONDUCTIVE OBJECTS
DE2656524B2 (en) Process for one-sided coating of a metal strip with molten metal
EP1563113B1 (en) Method and device for hot-dip coating a metal bar
DE3048672C2 (en)
DE102014106297B4 (en) Apparatus for leveling molten metal applied to a surface and equipment for direct casting of metal strip
EP0216121B1 (en) Method and device for forming crossed bobbins
DE10302745B4 (en) Method and device for hot-dip coating of metal strips, in particular steel strips
EP1390551B1 (en) Method and device for heat treatment of metal strands, especially steel strips
EP1781834B1 (en) Method for guiding a strip and use of said method
EP1597405A1 (en) Method and device for melt dip coating metal strips, especially steel strips
DE10215057B4 (en) Apparatus for hot-dip coating of metal strands and method therefor
DE3634067A1 (en) Feed device for cooling beds in steel-bar and section rolling mills
WO2004050941A1 (en) Device and method for hot-dip coating a metal strand
DE2457565C3 (en) Device for the machining of edges on fast-moving strip material
DE10014868A1 (en) Process for the hot dip galvanizing of steel strips comprises stabilizing the strip hydrostatic or hydrodynamic admission vertically to the strip surface in the container and/or in the guiding channel during strip movement

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20040608

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PT SE SI SK TR

AX Request for extension of the european patent

Extension state: AL LT LV MK RO

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PT SE SI SK TR

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.

Effective date: 20060531

Ref country code: SI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20060531

Ref country code: IE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20060531

REG Reference to a national code

Ref country code: CH

Ref legal event code: EP

Ref country code: CH

Ref legal event code: NV

Representative=s name: SCHMAUDER & PARTNER AG PATENTANWALTSBUERO

Ref country code: GB

Ref legal event code: FG4D

Free format text: NOT ENGLISH

REG Reference to a national code

Ref country code: SE

Ref legal event code: TRGR

REG Reference to a national code

Ref country code: IE

Ref legal event code: FG4D

Free format text: LANGUAGE OF EP DOCUMENT: GERMAN

REF Corresponds to:

Ref document number: 50303578

Country of ref document: DE

Date of ref document: 20060706

Kind code of ref document: P

REG Reference to a national code

Ref country code: HU

Ref legal event code: AG4A

Ref document number: E000464

Country of ref document: HU

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20060831

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)

Effective date: 20060920

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: PT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20061031

REG Reference to a national code

Ref country code: ES

Ref legal event code: FG2A

Ref document number: 2263008

Country of ref document: ES

Kind code of ref document: T3

ET Fr: translation filed
REG Reference to a national code

Ref country code: IE

Ref legal event code: FD4D

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MC

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20070228

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed

Effective date: 20070301

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20060901

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: BG

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20060831

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: EE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20060531

REG Reference to a national code

Ref country code: CH

Ref legal event code: PCAR

Free format text: SCHMAUDER & PARTNER AG PATENT- UND MARKENANWAELTE VSP;ZWAENGIWEG 7;8038 ZUERICH (CH)

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: CY

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20060531

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: TR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20060531

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: CZ

Payment date: 20100218

Year of fee payment: 8

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SK

Payment date: 20100218

Year of fee payment: 8

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: AT

Payment date: 20100212

Year of fee payment: 8

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: CH

Payment date: 20100812

Year of fee payment: 8

Ref country code: ES

Payment date: 20100729

Year of fee payment: 8

Ref country code: HU

Payment date: 20100816

Year of fee payment: 8

Ref country code: NL

Payment date: 20100813

Year of fee payment: 8

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FI

Payment date: 20100812

Year of fee payment: 8

Ref country code: FR

Payment date: 20100824

Year of fee payment: 8

Ref country code: IT

Payment date: 20100730

Year of fee payment: 8

Ref country code: LU

Payment date: 20100812

Year of fee payment: 8

Ref country code: SE

Payment date: 20100812

Year of fee payment: 8

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20100728

Year of fee payment: 8

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: BE

Payment date: 20100810

Year of fee payment: 8

BERE Be: lapsed

Owner name: *SMS DEMAG A.G.

Effective date: 20110228

REG Reference to a national code

Ref country code: NL

Ref legal event code: V1

Effective date: 20110901

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

REG Reference to a national code

Ref country code: SE

Ref legal event code: EUG

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20110220

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20110228

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20110228

REG Reference to a national code

Ref country code: SK

Ref legal event code: MM4A

Ref document number: E 727

Country of ref document: SK

Effective date: 20110220

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

Effective date: 20111102

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SK

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20110220

Ref country code: AT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20110220

Ref country code: BE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20110228

Ref country code: FI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20110220

Ref country code: CZ

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20110220

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20110901

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20110220

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20110228

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20110220

REG Reference to a national code

Ref country code: ES

Ref legal event code: FD2A

Effective date: 20120411

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: ES

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20110221

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20110221

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20130219

Year of fee payment: 11

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20110220

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: HU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20110221

REG Reference to a national code

Ref country code: DE

Ref legal event code: R119

Ref document number: 50303578

Country of ref document: DE

REG Reference to a national code

Ref country code: DE

Ref legal event code: R119

Ref document number: 50303578

Country of ref document: DE

Effective date: 20140902

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20140902