Metallurgical apparatus – Means for melting or vaporizing metal or treating liquefied... – Means to melt and separate metal from mass of diverse...
Patent
1997-06-27
1998-09-22
Kastler, Scott
Metallurgical apparatus
Means for melting or vaporizing metal or treating liquefied...
Means to melt and separate metal from mass of diverse...
266227, C22B 2100, C22B 704
Patent
active
058110569
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a cooling system for a press head and more particularly to a cooling system for an aluminium dross press.
BACKGROUND OF THE INVENTION
In any aluminium furnace system a substantial amount of dross is produced and this dross can contain a large amount of pure aluminium which is trapped in the dross. This aluminium can be released by mechanical action on the dross.
A system for mechanically pressing dross comprises a press head which is raised and lowered and acts on dross contained in a skim box the aluminium thus released being drained through a hole in the floor of the skim box into a press sow mould.
The press head generally comprises a semispherical shape which has a plurality of ridges thereon to increase pressure on the dross as the head is raised and lowered onto the dross.
The press head is obviously heated to the high temperature of the aluminium dross which has preferably been transferred into the skim box directly from the furnace. It is advantageous to be able to cool the head in order to quickly cool the dross and to reduce thermal stress on the head.
An obvious method of cooling is to use water to cool the head but this can be extremely dangerous since if the head cracks cold water will pour onto the hot dross possibly causing an explosion resulting in flying hot aluminium. This is obviously unacceptable.
The use of water also presents problems in any system which allows rotation of the press head, since the water pipe connections need to be flexibly connected to the head. Even then for normal pipe connection the head can not continuously rotated but must reciprocate rotating in a first direction and then backwards back to its starting position.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a press head system which can be cooled by passage of air and which can rotate continuously in a stepped manner in a preferred direction.
By continuous rotation it is not meant that the head is always rotating but that it continues to rotate in a stepped or in remental manner in the same direction.
The present invention therefore provides a press head system for pressing aluminium dross the press head bang provided with means for movement in a vertical direction to press dross contained in a skim box situated beneath the head in which the means for movement of the press head comprises hydraulic ram means, said ram means being operative to raise and lower the press head and including means for the passage of cooling air through said press head said means comprising a plurality of air inlet holes proximate to the periphery of the press head.
Preferably said ram means is operative to raise and lower the press head by means of a double acting hydraulic cylinder and an actuating rod, in which the actuating rod is hollow and is connected to the press head to allow cooling air to pass through the hollow rod and the press head.
Preferably the operating rod is elongate and protrudes from both ends of the double acting hydraulic cylinder at the bottom end being connected to the press head and at the top end being enclosed in a chamber sized to allow movement of the actuating rod within the chamber.
Preferably the chamber includes an air outlet connected to an air blower which pulls air out of the chamber and through the hollow actuating rod.
Preferably the press head is provided with a plurality of air inlet holes proximate to its periphery each hole being provided with a guard mesh to allow only cooling air to pass into the head.
Preferably the head is provided with an elongate sleeve which protrudes downwardly from the operating rod and which is operable to force the cooling air to pass close to the inner surface of the press head.
BRIEF DESCRIPTION OF THE DRAWINGS
Embodiments of the present invention will now be described with reference to the accompanying drawings in which.
FIG. 1 shows schematically in front elevation a press for aluminium dross;
FIG. 2 shows schematically in front elevational cross section a press sy
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patent: 4540163 (1985-09-01), Van Linden et al.
patent: 4565572 (1986-01-01), Van Linden et al.
patent: 4772320 (1988-09-01), Van Linden et al.
patent: 5397104 (1995-03-01), Roth
patent: 5669957 (1997-09-01), Roth
Kastler Scott
Taylor Reese
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