A scrap melting system and method includes a vessel that is configured to retain molten metal and a raised surface about the level of molten metal in the vessel. Solid metal is placed on the raised surface and molten metal from the vessel is moved upward from the vessel and across the raised surface to melt at least some of the solid metal. The molten metal is preferably raised from the vessel to the raised surface by a molten metal pumping device or system. The molten metal moves from the raised surface and into a vessel or launder.

In a molten metal pump, which includes a pump chamber portion and a drive unit and drives molten metal in a pump chamber of the pump chamber portion by the drive unit for discharging and sucking, the pump chamber portion has an outer cylinder and an inner cylinder detachably housed in the outer cylinder, the outer cylinder is configured as a bottomed cylindrical body having an outer cylinder bottom wall and an outer cylinder side wall, the inner cylinder is configured as a bottomed cylindrical body having an inner cylinder bottom wall and an inner cylinder side wall, a ring-shaped spacer, which is interposed between an inner surface of the outer cylinder bottom wall and an outer surface of the inner cylinder bottom wall in a sealed state and in a detachable manner, is further provided.

A scrap melting system and method includes a vessel that is configured to retain molten metal and a raised surface about the level of molten metal in the vessel. Solid metal is placed on the raised surface and molten metal from the vessel is moved upward from the vessel and across the raised surface to melt at least some of the solid metal. The molten metal is preferably raised from the vessel to the raised surface by a molten metal pumping device or system. The molten metal moves from the raised surface and into a vessel or launder.

A smart molten metal pump system and method automatically controls the operating speed of the pump rather than requiring an operator to control the speed. The system includes a pump, a controller for controlling the speed of the pump, and one or more of a temperature sensor (such as a thermocouple), one or more of a device (such as a laser or float) to measure the depth of the molten metal, and one or more of a vibration sensor (such as an accelerometer) to measure vibration. The controller receives input about the temperature of the molten metal, and/or about the depth of the molten metal, and/or about the vibration of the pump or one or more pump components, and possibly other data. The controller analyzes the one or more inputs to vary the speed of the pump, turn the pump off, and/or send a communication to an operator.

A sealing assembly for installation sealing between upper and lower hearths of a reflow oven, the sealing assembly comprising a sealing strip and a mounting seat, the mounting seat being disposed at the bottom of the sealing strip. The mounting seat is configured to be mounted on the reflow oven; the sealing strip is elastic and can be removably mounted on the mounting seat. A support part is disposed at one side and abreast of a sealing part, the support part being closer to a hearth position of the reflow oven than the sealing part is. The mounting seat enables quick fitting and quick removal of the sealing strip; the support part can greatly reduce the pressure acting on the sealing part, and effectively obstruct corrosion by flux and heat from inside the reflow oven, greatly extending the service life of the sealing strip.

A scrap melting system and method includes a vessel that is configured to retain molten metal and a raised surface about the level of molten metal in the vessel. Solid metal is placed on the raised surface and molten metal from the vessel is moved upward from the vessel and across the raised surface to melt at least some of the solid metal. The molten metal is preferably raised from the vessel to the raised surface by a molten metal pumping device or system. The molten metal moves from the raised surface and into a vessel or launder.

A melting and holding furnace includes a main body and a material input mechanism supplying a molten metal to the body which includes a melting chamber; a molten metal receiving chamber; a pumping-out chamber; and a molten metal heating mechanism. The input mechanism includes a molten-metal surface level sensor to detect that the surface height position of the metal in the pumping-out chamber has reached a lower limit that is set to be above the lower surface height position of a lid of the melting chamber, and is set to supply the receiving chamber with the metal and/or the metal block when the sensor detects that the surface height position of the metal in the pumping-out chamber has reached the lower limit so that the surface height position of the metal in the pumping-out chamber is always kept above the lower surface height position of the lid.

A scrap melting system and method includes a vessel that is configured to retain molten metal and a raised surface about the level of molten metal in the vessel. Solid metal is placed on the raised surface and molten metal from the vessel is moved upward from the vessel and across the raised surface to melt at least some of the solid metal. The molten metal is preferably raised from the vessel to the raised surface by a molten metal pumping device or system. The molten metal moves from the raised surface and into a vessel or launder.

A scrap melting system and method includes a vessel that is configured to retain molten metal and a raised surface about the level of molten metal in the vessel. Solid metal is placed on the raised surface and molten metal from the vessel is moved upward from the vessel and across the raised surface to melt at least some of the solid metal. The molten metal is preferably raised from the vessel to the raised surface by a molten metal pumping device or system. The molten metal moves from the raised surface and into a vessel or launder.

A molten metal pumping apparatus. The apparatus has each of a circulation function and a transfer function. The apparatus includes a molten metal pump having an outlet. The outlet is moveable while submerged in molten metal between a first position engaged with a circulation passage in a furnace assembly and a second position engaged with a transfer passage in the furnace assembly.