Device for inductively heating metallic strips

Details Device for inductively heating metallic strips Device for inductively heating metallic strips

H - Electricity

05

B

H05B 6/02 (2006.01) H05B 6/36 (2006.01)

Patent

CA 2419558

In order to carry out the optimal inductive heating of metal strips (1) of different widths, particularly in the edge area, a multiple-coil cross field inductor is provided above and below the strip (1) to be heated. The coil axes of the cross field inductor are arranged perpendicular to the strip surface. Each inductor is comprised of at least one inductor segment (2,3; 7; 15; 17), which is configured as a coil group consisting of several approximately rectangular coils (8,9,10; 16; 18) that extend predominantly transversal to the direction of conveyance of the strip (1), whereby the coils (8,9,10; 16, 18) have different stepped transversal extensions, and the coil with the largest transversal extension extends no further than up to the layer edges of the widest strip. The coil with the smallest transversal extension extends no further than up to the layer edges of the narrowest strip. Each inductor segment (2,3; 7; 15; 17) is connected to a circuit for effecting the defined clocking of its coils (8,9,10; 16, 18), and an identical inductor segment (2; 7; 15; 17) located above the strip is assigned to each inductor segment (3; 7; 15; 17) located below the strip. During inductive heating, the inventive device prevents the edges of metal strips (1) from becoming overheated regardless of strip width.

Pour parvenir à un chauffage inductif optimal de bandes métalliques (1) de différentes largeurs, notamment dans la zone marginale, il est prévu dans chaque cas un inducteur de champ transversal à bobines multiples, au-dessus et en dessous de la bande (1) à chauffer, dont l'axe de bobines est perpendiculaire à la surface de la bande. Chaque inducteur comprend au moins un segment d'induction (2,3 ;7 ;15 ;17) se présentant sous forme de bobine composite formée de plusieurs bobines (8,9,10 ;16,18) approximativement rectangulaires, qui s'étendent principalement transversalement au sens de transport de la bande (1). Lesdites bobines (8,9,10 ;16,18) présentent différentes extensions transversales étagées et la bobine qui présente la plus importante extension transversale s'étend au maximum jusqu'aux bords latéraux de la bande la plus large. La bobine qui présente l'extension transversale la plus réduite s'étend au maximum jusqu'aux bords latéraux de la bande la plus étroite. Chaque segment d'induction (2,3 ;7 ;15 ;17) est relié à un circuit afin de parvenir à une synchronisation définie de ses bobines (8,9,10 ;16 ;18) et un segment d'induction (2 ;7,15 ;17) identique situé au-dessus de la bande est alloué à chaque segment d'induction (3 ;7 ;15 ;17) situé en dessous de la bande. Le dispositif selon l'invention permet d'éviter, au cours du chauffage inductif, une surchauffe des bords des bandes métalliques (1), indépendamment de la largeur de la bande.

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