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AssigneeSMS Siemag Aktiengesellschaft
InventorsRolf Brisberger, Bernhard Tenckhoff, Holger Behrens, Bodo Falkenhahn, Walter Trakowski, Michael Zielenbach, Robert Jurgens
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The invention relates to a method for hot-dip coating a metal strand (1), especially a steel strip, according to which the metal strand (1) is vertically guided through a container (3) accommodating the molten coating metal (2) and through a guide channel (4) disposed upstream thereof. An electromagnetic field is generated in the area of the guide channel (4) by means of at least two inductors (5) disposed at both sides of the metal strand (1) to retain the coating material (2) in the container (3). In order to stabilize the metal strand (1) in a center position in the guide channel (4), an electromagnetic field, superimposing the electromagnetic field of the inductors (5), is generated by means of at least two additional coils (6) disposed at both sides of the metal strand (1). In order to improve efficiency of the control of the metal strand in the guide channel, the center position of the metal strand (1) in the guide channel (4) is stabilized in a closed control loop by carrying out the following steps: a) detecting the position (s, s′, s″) of the metal strand (1) in the guide channel (4); b) measuring the induced current (IInd) in the inductors (5); c) measuring the induced current (ICorr) in the additional coils (6); d) influencing the induced current (ICorr) in the additional coils (6) depending on the parameters (s, IInd,ICorr) measured in steps a) to c), in order to maintain the metal strand (1) in a center position in the guide channel (4). The invention further relates to a device for hot-dip coating a metal strand.
Method for hot dip coating a metal strand (1), especially a steel strip, in which the metal strand (1) is passed vertically through a coating tank (3) that contains the molten coating metal (2) and through a guide channel (4) upstream of the coating tank, wherein an electromagnetic field is generated in the area of the guide channel (4) by means of at least two inductors (5) installed on both sides of the metal strand (1) in order to keep the coating metal (2) in the coating tank (3), and wherein an electromagnetic field superposed on the electromagnetic field of the inductors (5) is generated by means of at least two supplementary coils (6) installed on both sides of the metal strand (1) in order to stabilize the metal strand (1) in a central position in the guide channel (4), wherein the center position of the metal strand (1) in the guide channel (4) is stabilized by the following sequence of steps in a closed-loop control system:
Device for hot dip coating a metal strand (1), especially a steel strip, in which the metal strand (1) is passed vertically through a coating tank (3) that contains the molten coating metal (2) and through a guide channel (4) upstream of the coating tank, with at least two inductors (5) installed on both sides of the metal strand (1) in the area of the guide channel (4) for generating an electromagnetic field in order to keep the coating metal (2) in the coating tank (3), and with at least two supplementary coils (6) installed on both sides of the metal strand (1) for generating an electromagnetic field superposed on the electromagnetic field of the inductors (5) in order to stabilize the metal strand (1) in a central position in the guide channel (4), comprising measuring devices (7, 7′, 7″, 8, 9) for measuring the position (s, s′, s″) of the metal strand (12) in the guide channel (4), the induced current (IInd) in the inductors (5), and the induced current (Korr) in the supplementary coils (6) and by automatic control devices (10) that are suitable for controlling the induced current (IKorr) in the supplementary coils (6) as a function of the measured parameters (s, s′, s″, IInd, IKorr) in order to keep the metal strand (1) in a central position in the guide channel (4), such that the supplementary coils (6) are installed within the extent of the inductors (5), as viewed in the direction of conveyance (R) of the metal strand (1).
Dependencies are inferred from the claim text.