Metallurgical apparatus – With means treating or handling gases exhausted by treating... – Hood
Patent
1997-06-27
1998-08-04
Kastler, Scott
Metallurgical apparatus
With means treating or handling gases exhausted by treating...
Hood
266227, 75672, C21B 304
Patent
active
057889180
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to fume extraction systems for dross presses and more particularly for aluminium dross presses.
In known dross presses such as described in U.S. Pat. Nos. 4,057,232, 4,386,956, and 5,397,104 the dross is pressed by being firstly tipped into a skim box and then pressed with a press head.
The inventors have discovered that when dross is pressed there can be very substantial fumes developed. In certain circumstances explosions can occur during pressing operations and these can result in hot gasses being emitted which may result in possible damage to adjacent machinery or even operators. In unusual circumstances, pieces of dross may be projected from the skim box which may be projected over substantial distances.
The known dross presses rely on the close fitting of the dross press head and the skim box to contain such explosions but these have been found to be only partially successful. Even if totally successful in preventing projection of particles, the fumes emitted can be very substantial.
The present invention has for a first object to provide a dross press fume extraction system to reduce the fumes emitted from the dross press when pressing dross.
The present invention also has for a second object to provide a protection system for a dross press to contain explosions within the press.
The present invention provides a dross press fume extraction system comprising a cabinet enclosing the dross press, fume extraction means connected to the cabinet, the fume extraction means including fan means, said fan means developing a negative air pressure within the cabinet to extract fumes from within the cabinet, said fan means being connected to a fume purification apparatus to purify the extracted fumes.
Preferably the cabinet is provided with front doors with interlocking engagement means preventing opening of the doors in the event of an explosion within the cabinet.
Preferably the interlocking engagement means is hydraulically controlled and comprises means for preventing operation of the dross press until the engagement means is locked.
Preferably the cabinet comprises air outlet means situated at the top of the cabinet to allow expulsion of explosive gases at an upper level.
In a preferred embodiment the fume extraction fan means comprises means for cooling the dross press head, the fumes being drawn through the press head to cool the head.
Embodiments of the present invention will now be described by way of example with reference to the accompanying drawings in which:
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 shows diagrammatically a dross press incorporating a fume extraction system in accordance with the present invention; and
FIG. 2 shows a cross-sectional front elevation of the fume extraction cabinet of FIG. 1.
With reference now to the drawings, the dross press 10 comprises a press head 12 and a skim box 14 and sow mould 16 to catch the molten liquid. The press is normally used for aluminium and this will be referred to hereafter.
In known manner hot dross 18 is placed into the skim box 14 and the press head 12 is hydraulically operated in the direction indicated by arrows 20 to press molten liquid from the dross.
In co-pending British Patent Applications Nos. 9507605.5 and 9518794.4 the contents of which are incorporated herein by way of explanation, the head 12 is cooled by passage of cooling air or fumes through inlet holes 120, 122 etc in the upper surface of head 12. The cooling air/fumes are extracted as described via a hollow ram 124 via an intermediate chamber 126 and a fan 128 to purification apparatus 130 (FIG. 1). The purification apparatus can be of a known type separate to or included in the purification apparatus associated with the furnace from which the hot dross is obtained.
In the present invention the head 12, skim box 14 and sow mould 16 are contained within a cabinet 30 which completely encloses the press, the cabinet having a top surface 32 through which hydraulic ram structure 124, 126 passes.
In a first embodiment illustrated in FIG. 2 air and fume
REFERENCES:
patent: 4003559 (1977-01-01), Kuwano et al.
patent: 4057232 (1977-11-01), Ross et al.
patent: 4527779 (1985-07-01), Roth et al.
patent: 4575056 (1986-03-01), Julliard et al.
patent: 4842255 (1989-06-01), Innus et al.
patent: 5397104 (1995-03-01), Roth
patent: 5439501 (1995-08-01), Watanabe et al.
patent: 5599379 (1997-02-01), Spoel et al.
patent: 5669957 (1997-09-01), Roth
Kastler Scott
Taylor Reese
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