Metallurgical apparatus – Means for melting or vaporizing metal or treating liquefied... – With means to discharge molten material
Patent
1985-10-04
1988-05-03
Rutledge, L. Dewayne
Metallurgical apparatus
Means for melting or vaporizing metal or treating liquefied...
With means to discharge molten material
266242, C22B 916
Patent
active
047415142
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a holding and/or smelting furnace for nonferrous metals having an apportioning device for the automatic removal of a predetermined quantity of the nonferrous molten metal from an apportioning chamber, which communicates with a chamber containing the nonferrous metal melt via at least one closable inlet opening and which can be acted upon by a compressed gas in order to emit a predetermined quantity of molten metal from an outlet opening.
Furnaces of this kind are generally used for scooping out a predetermined quantity of the particular nonferrous molten metal and deliver it to a die casting machine. The predetermined quantity to be removed depends on the size of the cast part to be produced in the die casting machine.
In a furnace known from German laid-open patent application DE-OS 29 14 810, the apportioning chamber is suspended on one lever arm of a beam of a weighing apparatus, and a separate closure element having a drive mechanism is provided. This arrangement is relatively complicated in structure and is expensive in view of the structural parts that are used.
SUMMARY OF THE INVENTION
It is the object of the present invention to devise a furnace for nonferrous metals which is simpler in structure.
This object is attained in a furnace for nonferrous metals of the above-mentioned general type in that the apportioning chamber is disposed in the furnace in a stationary manner, and preferably in the vicinity of the bottom thereof, with the inlet opening being closable by a reciprocating closure plunger containing a compressed gas delivery line and with the reciprocation of the closure plunger and the delivery of the compressed gas being controlled in accordance with weight or time.
In the holding and/or smelting furnace according to the invention, in a simple manner, a stationary apportioning chamber is utilized, thereby eliminating moving parts in the immediate vicinity of the furnace, which renders the apportioning device, in particular, less vulnerable to malfunction. Since the reciprocatable closure plunger also contains the compressed gas delivery line, the structure of the apportioning chamber in particular is simplified. A further advantage is that the nonferrous molten metal can be drawn from more-favorable areas within the furnace, since because of its stationary disposition the apportioning chamber can be disposed at the lowest point of the nonferrous metal melting bath.
Furthermore, the relatively small apportioning chamber is always full; thus the level of the bath at the outlet is always the same, only small quantities of compressed gas are required, and apportioning can be accomplished extremely quickly.
According to a preferred exemplary embodiment of the present invention, the apportioning chamber is disposed in an integrated manner in the furnace and embodies a portion of a furnace shell. As a result, the apportioning chamber can simply be provided simultaneously when the furnace shell is manufactured, and at the same time it can be disposed at the location which is most favorable for operation, both in terms of the removal of the nonferrous molten metal for the apportioned discharge and in terms of the discharge opening provided in the furnace.
It is efficacious for the integrated apportioning chamber to discharge directly via an inclined riser of predetermined flow cross section or indirectly via an inclined groove in a tapered discharge end of the furnace, so that the furnace can be moved close to the associated die casting machine substantially without interposing other elements for transporting the molten metal.
According to another exemplary embodiment of the present invention, the apportioning chamber is inserted as a separate structural component into the nonferrous molten metal in a scoop chamber. As a result, it is possible to provide even existing smelting and/or holding furnaces with an apportioning device of this kind retroactively, so that these furnaces can be made more efficient.
The determination of the qu
REFERENCES:
patent: 2058378 (1936-10-01), Freund
patent: 3708088 (1973-01-01), Lesher
Modern Metals, pp. 18-21, Feb. 1950.
Kastler S.
Rutledge L. Dewayne
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