摘要 |
<p>This invention is provided with: a molten metal heat retention device (100) having a first furnace wall (120) and a heater (180) capable of causing the molten metal to retain heat, the molten metal heat retention device (100) capable of housing a crucible (110) so that the opening-side outer wall surface of the crucible (110) is exposed by a predetermined amount; a crucible-fixing ring (200) having a second furnace wall (210), the inner wall surface of the second furnace wall (210) supporting, when the crucible-fixing ring (200) is in a state of being placed on the molten metal heat retention device (100), the opening-side outer wall surface of the crucible (110) in a state of being pressed against the opening-side outer wall surface along the outer circumference thereof, whereby the crucible-fixing ring (200) fixes the crucible (110); an auxiliary ring (300) having a third furnace wall (310), the auxiliary ring (300) having an inner diameter such that the inner diameter of the third furnace wall (310) is equal to or slightly larger than the outer diameter of the opening-side upper end part of the crucible (110); and a combustion device (400) having a fourth furnace wall (410) and a burner (440) for melting in the crucible (110), using a direct flame, the metal to be melted, the burner (440) being provided in a space surrounded by the fourth furnace wall (410). It is thereby possible to improve ease of maintenance, increase the lifespan, improve melting efficiency, and improve productivity of the molten metal.</p> |