| 摘要 |
<p>517,873. Preheating and melting metals. BUDD WHEEL CO. Aug. 9, 1938, No. 23466. Convention date, Aug. 9, 1937. [Class 51. (ii)] [Also in Group XI] Finely divided metal such as cast iron borings containing combustible foreign matter is fed through a preheater to drive off the foreign matter and is fed through the preheater to a bath of molten metal in a furnace at such a rate that it is melted substantially as it enters the bath. As shown in Fig. 1, the metal is fed from a hopper 24 having an adjustable slide 26 on to a vibrating trough 16 arranged within a preheating chamber 14 where it is subjected to the flame from a burner 29. The metal falls from the trough 16 down a shoot 32 into a hopper 33 provided with an outlet controlled by a slide so as to feed the metal into the hopper 37 of an oscillating electric furnace 10 when the hopper 37 arrives beneath the hopper 33. The slide is actuated by a motor 36<1> controlled through a slide valve 37<1> operated by a cam on the wall of the furnace 10. In the furnace 41 shown in Fig. 4, the' metal is fed to the centre of the bath 43 between the electrodes by a refractory shoot 42. Material such as graphite, coke or the like or silicon may be added to the metal in the preheating chamber.</p> |
