MULTIHEARTH FURNACE Russian patent published in 1997 - IPC

FIELD: metallurgy. SUBSTANCE: multihearth furnace contains lined body with hearths, central hollow shaft with sticks provided with rakes secured on it and drive. To reveal in due time defective stick due to quick removal of ball from furnace, multihearth furnace is provided with numbered balls, receiving hopper, circular chamber and lever. Balls are secured on sticks in their head portions on inner side of hollow shaft. Receiving hopper is mounted in shaft cavity at level of lower hearth and is brought in communication with circular chamber which is located below it. Circular chamber is provided with hole for escape of ball. Lever is located under circular chamber and is provided with ball catcher fitted on one end of lever. Other end of lever is connected with drive by means of sensor for disconnecting the drive. EFFECT: enhanced reliability. 2 dwg