Patent ID: 8709334

Claim:
A metal melting apparatus comprising: a heating furnace having a heating room; a melting furnace mounted on the heating furnace and having a furnace body mounted in the heating room of the heating furnace and having a top opening; and a cover mounted on the top opening of the furnace body and sealing the furnace body; a high-cycle regenerative system (HRS) having a regenerative heat room communicating with the heating room; a pair of burners mounted in the regenerative heat room and heating the heating room of the heating furnace alternately; a pair of regenerative heat exchanger units respectively mounted on the pair of burners; and an air duct having an inlet connected to and communicating with the pair of burners; and an outlet protruding out of the regenerative heat room; a raw material feeding device having feed pipe having an outlet communicating with the furnace body; a preheating screw axially mounted through the feed pipe and having an air duct rotatably mounted through the feed pipe and having multiple air holes separately formed through the air duct of the preheating screw; and an inlet connected to and communicating with the outlet of the air duct of the HRS; and a helical blade formed around an outer surface of the air duct of the preheating screw; and a feeding hopper mounted on the feed pipe, and connected to and communicating with an interior of the feed pipe; and a melted material feeding device mounted on the cover of the melting furnace and protruding into the furnace body.