Device for heating a metal strip, and apparatuses equipped with a device of this type, for producing hot-rolled metal strip

Abstract

The invention provides a device for heating a metal strip, which device allows the metal strip to be heated precisely and rapidly to a predetermined temperature, while taking up little space. The invention also relates to an apparatus that is suitable for producing hot-rolled metal strip, with which apparatus, despite the small overall space available, optimal heating, in terms of the hot-rolling process, of the rolling stock may be carried out. For this purpose, the device according to the invention is equipped with at least one inductively operating heating device, which comprises an inductor inducing an electromagnetic field, which inductor extends over the conveying path of the metal strip to be heated and the position of which is adjustable transversely to the conveying path depending on the width of the metal strip.

1 . Device for heating a metal strip, in particular a steel strip to be hot-rolled following the reheating process, comprising at least one inductively operating heating device, which comprises an inductor inducing an electromagnetic field, which inductor extends over the conveying path of the metal strip to be heated and the position of which is adjustable transversely to the conveying path depending on the width of the metal strip.  
     
     
         2 . Device according to  claim 1 , wherein it is equipped with at least two inductively operating heating devices arranged in pairs.  
     
     
         3 . Device according to  claim 2 , wherein one heating device is arranged laterally of one side of the conveying path and the other heating device is arranged laterally of the other side of the conveying path.  
     
     
         4 . Device according to  claim 1 , wherein inductors respectively extend over the upper side and the lower side of the metal strip to be heated.  
     
     
         5 . Device according to  claim 1 , wherein the inductors carry metal sheets, which influence the orientation and extent of the electromagnetic field generated by the inductors.  
     
     
         6 . Device according to  claim 1 , wherein it comprises at least four heating devices.  
     
     
         7 . Device according to  claim 6 , wherein the heating devices are arranged in alternation laterally of one side and of the other side of the conveying path in the conveying direction of the metal strip.  
     
     
         8 . Device according to  claim 6 , wherein in succession in the conveying direction of the metal strip, a first heating device is positioned laterally of one side, two heating devices are positioned laterally of the other side, and the fourth heating device is positioned laterally of the side of the transportation path with which the first heating device is associated.  
     
     
         9 . Device according to  claim 1 , wherein the heating devices comprise a respective converter and in that the converters of all of the heating devices are in mutual forced synchronisation.  
     
     
         10 . Device according to  claim 1 , wherein in a plan view of the conveying path, the inductors exhibit an elongate, rectangular shape.  
     
     
         11 . Device according to  claim 10 , wherein the inductors comprise a respective heat conductor, which comprises a first longitudinal portion, which, starting from a connection portion, extends along the outside of one longitudinal side of the respective inductor, a second longitudinal portion, which extends along the outside of the other longitudinal side, a third longitudinal portion, which extends along the inside of the first longitudinal portion, a fourth longitudinal portion, which extends along the inside of the second longitudinal portion and is connected to a second connection portion, a first short portion, which externally connects the end of the first longitudinal portion that is remote from the connection portion to the end of the second longitudinal portion that opposes this end, a second short portion, which connects the other end of the second longitudinal portion to the end of the third longitudinal portion that opposes it, and a third short portion, which internally connects the other end of the third longitudinal portion to the end of the fourth longitudinal portion that opposes it.  
     
     
         12 . Device according to  claim 11 , wherein the connection portions and the second short portion are arranged parallel to one another.  
     
     
         13 . Device according to either  claim 11 , wherein the first and the third short portions are curved in their configuration.  
     
     
         14 . Apparatus for producing hot-rolled metal strip, comprising a device for casting a molten metal to form a cast metal strip, a device for hot-rolling the cast metal strip and a device, which is arranged between the device for casting and the device for hot-rolling and is configured according to  claim 1 , for reheating the cast strip prior to the hot-rolling process.  
     
     
         15 . Apparatus for hot-rolling carried out in a reversing manner, comprising a reversing rolling stand and comprising at least one device configured according to  claim 1 , which device is arranged on one of the entry/exit sides of the reversing rolling stand and by which the stock to be hot-rolled is reheated prior to a rolling pass.