Brown Boveri Corporation

Bbc Brown Boveri Ag

Hans Gunther Heine

Otto Hochstrasser

Fritz Hegewaldt

Heinz Buechi

A ladle scraper mechanism 20 comprises an outer frame 44 which supports and guides a carrier assembly 58 for up and down movement to move scraper legs 57, with scraper blades 72 at their lower ends, down along the lining of a ladle 22 containing a bath 40 of molten metal while vibrators 70 on the top of the legs vibrate them and pneumatic actuators 68 on the carrier assembly force the legs to swing radially outwardly against the ladle walls.

Ladle scraper mechanism

A controlled atmosphere furnace having radiant heating tubes, through which hot gases from a fuel burner are passed, is converted to electrical operation by removing the fuel burner and exhaust connections from the heating tubes and replacing these with electrical connector extensions connected to an electrical power source so that electrical current is driven longitudinally through the heating tube walls and converted therein to heat which is radiated into the furnace enclosure.

Furnace conversion method and apparatus

A preheating arrangement for bringing foundry ladles up to temperature is described. The arrangement comprises a slotted elongated graphite rod extending down from a ladle cover, a pair of clamp and contact elements extending through the cover and a transformer above the cover with a shell around the transformer forming a single turn secondary winding connected directly to the clamp and contact elements. A graphite element is coated to protect it from corrosive atmospheres by heating it, while buried in sand, to the fusing temperature of the sand and then allowing it to cool.

Growing community of inventors

Little Silver, NJ, United States of America

Hans Gunther Heine