| 摘要 |
A metal melting furnace is provided having an enclosing roof that has a refractory brim portion affixed to and carried by the side walls, and has a refractory crown portion that is adapted to be removably positioned to close-off and open a central charging opening defined and encompassed by the brim portion. The crown portion by-passes electrodes in its "down" position and is to be raised and lowered and swung into and out of a clearing position with respect to the charging opening. Exhaust fume from a side-positioned smoke hole of the furnace is directed either into and positively drawn through a side-positioned-preheating scrap container or through an exhaust chest for subsequent environmental treatment before discharge into the atmosphere. The preheating container has a chamber divided into a front high temperature compartment and a back lower temperature compartment through which hot exhaust fume from the furnace exhaust port is fed in a reverse manner from a bottom opening in the high temperature compartment. A top hood-like lid is carried by the upper end of the container and is adapted to swing into a downwardly declining scrap-mixing and guiding, open position when the container is tilted forwardly on its platform. To cooperate with and limit the down swing of the lid, to guide down-flow of the scrap, and to protect the feed opening in the furnace during the charging operation, a swing guide funnel is employed.
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