Brushing – scrubbing – and general cleaning – Machines – With air blast or suction
Patent
1994-05-26
1995-08-15
Moore, Christopher K.
Brushing, scrubbing, and general cleaning
Machines
With air blast or suction
153161, 15319, 15345, B21B 4502
Patent
active
054407796
DESCRIPTION:
BRIEF SUMMARY
This invention relates to apparatus for removing moisture from an edge region of metal strip that is moving in the direction of its length. In particular, the apparatus is for removing moisture from an edge region of aluminium strip.
The final rolling stages of aluminium strip consist of rolling the strip through a number of rolling mill stands, sometimes arranged in tandem, so that the strip leaving the last stand is of the required gauge. This strip is then coiled for subsequent use. The rolls of the mill stands are cooled by having liquid coolant applied to them on the entry side. It has been the practice to employ kerosene as the liquid coolant. However, for various reasons, it would be preferable to use water as the liquid coolant, but it is absolutely vital to keep water off the strip on the exit side of the mill when it is coiled because water left on the surface of the coiled strip dries and causes considerable staining of the strip rendering it unacceptable to many potential users.
Steps may be taken to remove any moisture remaining on the upper and lower surfaces of the strip downstream of the last stand to avoid staining of the aluminium strip. However, it is known for a thin layer of moisture to remain on the longitudinally extending edge regions of the metal strip and particularly moisture taking the form of a bead which attaches itself to the extreme edge of the strip. When the strip is coiled the moisture on the edge region of the strip, particularly the bead of moisture on the edge region, seeps back into the coil between adjacent turns and, as it dries, it stains the aluminium. For many applications of the aluminium strip, staining of the edges is not acceptable.
According to the present invention, apparatus for removing moisture from an edge region of metal strip moving in the direction of its length is characterised in that it comprises a hollow housing having a slot in an outer wall thereof; means for supporting the housing relative to the path taken by the strip so as to permit the edge region of the moving strip to project into the slot and be in communication with the interior of the housing; nozzle assemblies in the housing by which air under pressure is directed on to the upper and lower surfaces of the edge region of the strip in the slot, the air being directed towards the edge of the strip so as to remove any moisture present on the strip; and means for extracting air and moisture from the housing.
The jets of air leaving the nozzle assemblies wipe across the longitudinally extending edge regions of the upper and lower surfaces of the strip displacing the moisture therefrom in the form of droplets and particularly removing the bead of moisture which may be present on the edge of the strip. This bead is smashed by the turbulent air and is taken with the air into the hollow housing in the form of a mist from where it is extracted.
Conveniently, such apparatus is provided for removing moisture from both longitudinally extending edge regions of the metal strip.
Conveniently, the housing is so mounted that it can be moved in a direction parallel to the width dimension of the strip so that the apparatus can be used with strips of different widths.
Detector means may be provided in the housing to detect the position of the edge of the strip and control means are employed to automatically displace the housing towards and away from the edge of the strip so that the edge remains at a desired position relative to the nozzle assemblies which are in the housing.
In order that the invention may be more readily understood, it will now be described, by way of example only, with reference to the accompanying drawings, in which:
FIG. 1 is a side elevation, partly in section, of a rolling mill stand showing apparatus in accordance with the present invention; and
FIG. 2 is an end elevation of the apparatus shown in FIG. 1.
A rolling mill for rolling metal strip, particularly aluminium strip, has a pair of work rolls 1, 3. A number of rolling mill stands may be arranged in tandem and, downstream of
REFERENCES:
patent: 3601837 (1971-08-01), Conrad et al.
patent: 3849831 (1974-11-01), DeVerter et al.
patent: 4395793 (1983-08-01), Wedel et al.
Davy McKee (Poole) Limited
Moore Christopher K.
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