Stirring-roll for a continuous cast machine of metallic products of large cross section

Abstract

Stirring roll comprising: (a) a shell ring 1 made of nonmagnetic steel in rotation of axis A-A and intended to come into contact with the surface of a large face of the cast slab ( 6 ), (b) mechanical-connection members, arranged on each side of the shell ring to support the shell ring while leaving it free to rotate axially, (c) support elements 4 which are offset on either side beyond the limits of the shell ring and fixed to the rigid frame 5 of the casting machine, (d) internal electromagnetic equipment consisting of at least one polyphase linear inductor 8 mounted coaxially with respect to the shell ring so as to leave between the two an annular space 11 through which a cooling liquid can circulate, and which constitutes an axial shaft provided with terminal extensions 20 that rest, without the ability to rotate axially, on the fixed support elements 4 and which are hollow so as to allow the passage of the cooling liquid and of the electrical connections of the inductor, and (e) inlet/outlet casings 16 for the cooling liquid which are provided with electrical connection terminals 18 a, 18 b and mounted at the ends of the terminal extensions 20 of the inductor beyond the fixed support elements 4; this stirring roller, which is characterized in the shell ring bears against said terminal extensions ( 20 ) of the inductor ( 8 ) via rolling bearings ( 3 ), has been designed to be suitable also for the casting of extra-wide slabs.

What we claim is: 
     
         1 . A stirring roll for a continuous casting machine of metallic products having a broad cross section, such as a slab, comprising:
 (a) at least one external axially rotating tubular body made of non-magnetic steel intended to come into contact with the surface of a wide face of the cast slab,   (b) mechanical connection elements that ensure the support of the tubular body while allowing it to freely rotate axially,   (c) support elements of the stirring roll located on both sides beyond the limits of the tubular body and fixed to the rigid frame of the casting machine,   (d) internal electromagnetic equipment consisting of at least one polyphasic linear inductor with a sliding magnetic field, mounted coaxially with the tubular body so as to provide an annular space between them for the circulation of a cooling liquid, said equipment forming an axial shaft equipped with end extensions that come to rest blocked against axial rotation on said support elements, said end extensions being hollow to allow the passage of cooling liquid and the passage of the electrical connections of the inductor, and   (e) inlet/outlet boxes for cooling liquid equipped with electrical connection terminals and mounted on the ends of the terminal extensions of the inductor beyond said support elements;   
       stirring roll characterized in that the tubular body ( 1 ) bears on the inductor ( 8 ) by means of said mechanical connecting elements formed by the bearings ( 3 ) located between said tubular body and the terminal extensions ( 20 ) of the inductor. 
     
     
         2 . The stirring roll according to  claim 1 , characterized in that it comprises two separate aligned half tubular bodies ( 1   a,    1   b ) equipped with mechanical connection elements with an intermediate extension ( 20   c ) of the inductor without electric windings, and a central support ( 21 ) connected to the rigid frame ( 5 ) of the casting machine, said mechanical connection elements being formed by at least one intermediate bearing ( 3   c,    3   d ) carried by said intermediate extension ( 20   c ) and the latter being supported by said central support ( 21 ). 
     
     
         3 . The stirring roll according to  claim 2 , characterized in that each half tubular body ( 1   a,    1   b ) incorporates its own inductor ( 8   a,    8   b ). 
     
     
         4 . The stirring roll according to  claim 2 , characterized in that said intermediate bearing is a single bearing, common to the two half tubular bodies ( 1   a,    1   b ) and fixed on both of its sides to the latters' ends.