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Removing oily scrap from stamping presses.

Removing oily scrap from stamping presses

Oily, sticky scrap produced in stamping operations requires special engineering and selection of scrap-removal equipment. While extremely sticky materials are not handled well by oscillating conveyors alone, this type of equipment combined with steel-belt conveyors usually works well.

In a booklet entitled, "The selection of metal scrap-handling conveyors," Prab Conveyors Inc, Kalamazoo, MI, gives a case history of a successful scrap-removal system in a roller bearing factory. Here the challenge was to collect scrap from production areas, and discharge it into open-top trailers outside the plant. The discharge conveyor was designed to distribute the load as it accumulated, thus avoiding concentrated pileup that might require manual shifting.

In this system, one of three in the plant, three types of conveyors have been interconnected. These make up a system that meets the user's objectives while overcoming some peculiar operating problems.

The main run is a series of oscillating conveyors. These were chosen because they have a low initial cost and low maintenance costs. Further, these conveyors handle surges in material flow, and operate quietly when anchored properly.

Since the length of oscillating conveyors is limited to about 80 ft to avoid heavy loading of the drives, this system uses several sections. Conveyor height and width are altered at each interchange point to avoid creating pinch-points. This is an important consideration with oscillating conveyors, since the flow of material is not positive, and pinch-points create jamups.

Outside the plant wall, a hinged steel-belt conveyor elevates material discharged from the oscillating conveyor system. The steel-belt conveyor dumps material onto a short, horizontal run of conveyor that discharges into trailers.

Because the scrap is oily, it tends to carry beyond the discharge point. This may create two problems: One, scrap could accumulate on the underside of the steel belt, creating damaging jamups; or two, scrap may discharge by gravity at random points where it is not wanted.

These potential problems were avoided by two measures. First, the top horizontal run of the hinged, steel-belt conveyor was designed to be longer than usual. This gave over-running scrap more room to discharge by gravity before it could cause problems.

Second, a hinged steel-belt shuttle conveyor was added. Moving along the length of the receiving trailer, this shuttle distributes the load evenly. The shuttle also catches over-run scrap from the horizontal run of the elevating conveyor.

The booklet in which this application was given contains sections covering not only scrap-handling case histories (six are described), but also conveyor selection, types and characteristics of scrap, and basic characteristics of various scrap-handling equipment. Covered are conveyors, dumper/lifters, and bucket elevators.
COPYRIGHT 1989 Nelson Publishing
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Copyright 1989 Gale, Cengage Learning. All rights reserved.

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Publication:Tooling & Production
Date:Oct 1, 1989
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