Metallurgical apparatus – Means for melting or vaporizing metal or treating liquefied... – By separating metal in a molten mass from undesired...
Reexamination Certificate
2000-04-12
2001-03-06
Kastler, Scott (Department: 1742)
Metallurgical apparatus
Means for melting or vaporizing metal or treating liquefied...
By separating metal in a molten mass from undesired...
C266S275000
Reexamination Certificate
active
06197250
ABSTRACT:
The present invention relates to a telescopic dross pot and more particularly to a dross pot and sow mould combination and, in particular, a combination for use with a dross press.
The known operation of a dross press comprises the steps of removing dross from a furnace, depositing the dross into a dross pot and then transporting the dross pot to the press. During the transportation process “free” aluminum will drain from the dross pot through one or more drainage holes. To contain this free aluminum the dross pot is combined with a sow mould positioned under the dross pot and this sow mould collects the free aluminum during transportation
During the pressing operation, the dross in the dross pot is subjected to pressure from the press head and the aluminum pressed from the dross is drained into and then contained in the sow mould.
The sow mould has therefore to be of a size to contain a fixed percentage, say for example 25% of the weight of dross in the dross pot since this will be the anticipated aluminum yield.
This presents a problem, since the dross pot is positioned above the sow mould and therefore for a given size of dross pot/sow mould combination the height of the top edge of the dross pot has to be a minimum value above ground level.
Therefore, for a given design of furnace there will be a maximum height of the top edge of the dross pot.
For furnaces with a high front sill, this will not be a problem. However, many furnaces already installed have relatively low front sills. These furnaces cannot be readily modified to raise the sill level.
A known solution to this problem lies in the use of smaller dross pot/sow mould combinations. For relatively large furnaces, however, this is not a satisfactory solution because the dross would not be recycled quickly enough in a single dross press. Thus, if smaller dross pot/sow mould combinations are used, then extra dross presses will be required. This not only adds to the expenditure in the initial installation, but also will significantly add to the running costs since more operations will be required.
It is an object of the present invention to provide a dross pot/sow mould combination which is particularly suitable for low sill furnaces.
The present invention provides a dross pot and sow mould combination, comprising mounting means connected to said dross pot and said sow mould to connect together said dross pot and said sow mould in a relationship in which said dross pot is mounted above said sow mould in which the mounting means connecting the dross pot and the sow mould comprises means enabling the sow mould to move relative to the dross pot to vary the distance between the dross pot and the sow mould.
Preferably the sow mould is suspended beneath the dross pot, said mounting means comprising extendable means.
Preferably said extendable means comprises slot means allowing said sow mould to move towards and away from said dross pot by a defined distance.
Preferably said slot means comprises first and second slotted members on a first side of said dross pot and at least a third slot means on an opposite side of said dross pot.
Preferably said third slot means includes releasable latch means and said first and second slot members comprise hinge members thereby allowing said sow mould to pivot relative to said dross pot.
This movement allows an aluminum pig within the sow mould to be tipped out.
REFERENCES:
patent: 4386956 (1983-06-01), Roth et al.
patent: 5397104 (1995-03-01), Roth
patent: 5669957 (1997-09-01), Roth
patent: 5788918 (1998-08-01), Bramley
patent: 5811056 (1998-09-01), Bramley
patent: 5882580 (1999-03-01), Pownall
patent: 5980817 (1999-11-01), Pownall
patent: 6063330 (2000-05-01), Bramley
J. McIntyre (Machinery) Limited
Kastler Scott
Taylor Reese
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