Continuous casting installation for the electromagnetic rotation of molten metal moving inside the nozzle

Abstract

A continuous casting installation for metals comprises a submerged nozzle surrounded by an annular electromagnet inductor with a magnetic field that rotates around the casting axis, and which drives the molten metal in an axial rotation. The inductor is a polyphase type with a magnetic field passing therethrough and is equipped with a pair of projecting poles ( 3 ) per phase. The end of each projecting pole opposite the nozzle is provided with a lateral narrowing which increases the distance separating the polar ends.

1 - 6 . (canceled)  
   
   
       7 . An installation for the continuous casting of metals, particularly steel, in which a submerged nozzle, via which molten metal to be cast arrives in a mold from a tundish located thereabove, is surrounded by an annular electromagnetic inductor having a magnetic field that rotates about a casting axis and is intended to force said molten metal to rotate axially therewith, said inductor being of the polyphase traversing-magnetic-field type, said inductor being provided with a pair of poles per phase and each pole of which is formed by an electrical winding wound around an inwardly salient pole tooth that terminates in a pole face placed facing said nozzle, said pole teeth being connected together by an outer peripheral magnetic yoke for closing the magnetic flux, each pole tooth having, at the end of its salient part, a lateral taper that increases the distance by which said pole faces are separated from one another.  
   
   
       8 . The continuous casting installation as claimed in  claim 7 , wherein said submerged nozzle is a nozzle with lateral outlets.  
   
   
       9 . The continuous casting installation as claimed in  claim 7 , wherein said inductor includes, on its inner periphery, a heat shield surrounding said nozzle at some distance therefrom.  
   
   
       10 . The continuous casting installation as claimed in  claim 7 , wherein said annular inductor is formed from two pivoting articulated half-shells.  
   
   
       11 . The continuous casting installation as claimed in  claim 7 , wherein it further includes a resonant electrical circuit in which said inductor is connected in series with an adjustable capacitor.  
   
   
       12 . The continuous casting installation as claimed in  claim 10 , wherein said inductor is mounted on the end of support arms for keeping it in position, these support arms being retractable and provided with controlled means that actuate each half-shell so that they pivot