A solid-melting furnace, the two sides of the furnace body of the solid-melting furnace are respectively provided with a feeding door and a discharging door; A workpiece conveyor belt that can place workpieces, a plurality of heating units are respectively arranged in the furnace along the feeding direction, and the heating units include an air guide device, a heat radiation tube and a heat circulation fan. The cover is arranged above the workpiece conveyor belt, the thermal circulation fan and the heat radiation pipe are fixed in the inner recess of the air guide device, and the two sides of the inner recess of the air guide device are provided with air inlets and are connected with the air outlet of the heat circulation fan. The hot air blown by the fan is guided by the air guide device and then all blown onto the surface of the workpiece placed on the workpiece conveyor belt. The solid melting furnace can improve the guidance of the heat flow, ensure that the workpiece is heated evenly, thereby improving the heating quality, and at the same time, it can meet the requirements of the furnace. The internal temperature difference is 1.5℃~2℃.
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