Electromagnetic braking device for molten steel that flows into a continuous casting mold

Abstract

The invention relates to an electromagnetic braking device for molten steel that flows into a continuous casting mould ( 1 ). Said device comprises at least one solenoid ( 2 ) with a ferromagnetic core ( 5 ) that is allocated to the broad sides ( 3, 4 ) of the mould. To reduce the oscillating mass and at the same time increase the strength of the magnetic field, the core ( 5 ) consists of a primary part ( 6 ) that houses the solenoid ( 2 ) and can be displaced at a distance from the broad side walls ( 3, 4 ) and attachments ( 8, 8 ′) that are fixed in water tanks ( 7, 7 ′) of the mould ( 1 ). When combined in their operating position, the core parts ( 6, 8 ) produce U-shaped yokes ( 9, 9 ′) for generating a closed magnetic flux ( 10 ) and when moved apart, cause the magnetic flux ( 10 ) to be interrupted.

1 . Electromagnetic braking device for molten steel flowing into a continuous casting mold ( 1 ), which comprises at least one magnet coil ( 2 ) with a ferromagnetic core ( 5 ) assigned to the broad sides ( 3 ,  4 ) of the mold, wherein the core ( 5 ) consists, on the one hand, of a primary part ( 6 ) that houses the magnet coil ( 2 ), that can be moved by a drive unit ( 14 ) to within a certain distance of the broad-side walls ( 3 ,  4 ), and that is disconnected from the oscillation and, on the other hand, of additional parts ( 8 ,  8 ′) that are permanently installed in water tanks ( 7 ,  7 ′) of the mold ( 1 ), such that, when the parts of the core ( 6 ,  8 ) are brought together in their operating position, they form U-shaped yokes ( 9 ,  9 ′) for generating a closed magnetic flux ( 10 ), and when they are moved apart, the magnetic flux is interrupted.  
   
   
       2 . Braking device in accordance with  claim 1 , wherein the ferromagnetic additional parts ( 8 ,  8 ′) installed in water tanks ( 7 ,  7 ′) are assigned to the yokes ( 9 ,  9 ′).  
   
   
       3 . Braking device in accordance with  claim 1 , wherein vertical recesses ( 11 ,  11 ′) are formed in the broad-side walls ( 3 ,  4 ) on the lateral surfaces that face the water tanks ( 7 ,  7 ′), and ferromagnetic filler pieces ( 12 ,  12 ′) are fitted into these recesses.  
   
   
       4 . Braking device in accordance with  claim 1 , wherein the primary part ( 6 ) of the core ( 5 ) with the magnet coil ( 2 ) can be moved in guides ( 13 ,  13 ′) by means of a hydraulic actuator or electric drive ( 14 ) in the direction perpendicular to the broad-side walls ( 3 ,  4 ).  
   
   
       5 . Braking device in accordance with  claim 1 , wherein the filler pieces ( 12 ,  12 ′) are of variable length or width and/or depth.  
   
   
       6 . Braking device in accordance with  claim 1 , wherein the movable partial core with its primary part ( 6 ) and the magnet coil ( 2 ), drive unit ( 14 ), and guides ( 13 ), on the one hand, and the additional core parts ( 8 ,  8 ′), which are permanently installed, especially by welding, in water tanks ( 7 ,  7 ′) of the mold ( 1 ), on the other hand, do not form a fixed mechanical connection at their contact points ( 16 ,  16 ′) but rather are held together by magnetic forces.  
   
   
       7 . Braking device in accordance with  claim 1 , wherein the contact points ( 16 ,  16 ′) are designed as friction bearings or roller bearings ( 17 ,  171 ), whose parts ( 18 ,  18 ′) assigned to the water tanks ( 7 ,  7 ′) are caused, together with the water tanks, to oscillate with the mold ( 1 ), while the parts assigned to the primary part ( 6 ) of the core ( 5 ) and the magnet coil ( 2 ), including the drive unit ( 14 ) and guides ( 13 ), are disconnected from the oscillation.  
   
   
       8 . Braking device in accordance with  claim 1 , wherein the sliding friction of a friction bearing ( 17 ,  17 ′) is at least mostly eliminated in the region of the contact points ( 16 ,  16 ′) by an antifriction layer ( 18 ,  18 ′), especially an air cushion.  
   
   
       9 . Braking device in accordance with  claim 8 , wherein the air cushion is maintained by introducing compressed air into the central region of the contact points ( 16 ,  16 ′).