Conveyors – chutes – skids – guides – and ways – Chutes
Reexamination Certificate
2000-03-13
2001-06-26
Bidwell, James R. (Department: 3651)
Conveyors, chutes, skids, guides, and ways
Chutes
Reexamination Certificate
active
06250450
ABSTRACT:
This invention relates in general to an impact liner or member for granular material, and more particularly to a chute liner to extend the life of a chute and an impact member to extend the life of a screen deck.
BACKGROUND OF THE INVENTION
In many industrial installations, including coal mines, power stations, concrete mixing plants, and many others, it is necessary or desirable to move appreciable quantities of granular material from one location to another. For example, in a coal mine quantities of granular coal may need to be moved, often in two or more steps, from a mine face to a storage location for subsequent shipment to a coal consumer. In a power station utilizing granular coal for fuel, the coal is often initially stored at a site separate from the power generating installation and is subsequently delivered to that installation as needed. Similarly, the ash or other waste product produced by burning of the coal may require removal from the power generation facility to yet another separate location. In a concrete mixing plant a granular stone aggregate may be initially stored at a location remote from the mixing plant; in such an installation, the aggregate may be moved to the mixing plant when it is needed.
In these and many other industrial facilities a conveyor, usually a belt conveyor, is employed to transport the granular material (e.g., coal, granular stone aggregate, etc.) to or from the location at which it is utilized. Most such conveyors have an input chute for delivering the granular material to the conveyor and a discharge chute for discharge of the granular material at the output end of the conveyor. In either case, the chute often includes one or more impact surfaces on which the granular material impinges. Those impact surfaces are often subject to appreciable abrasion from the granular material, and hence present a continuing requirement for repair and/or replacement of the chute.
Prior proposals directed toward amelioration or correction of these and similar abrasion problems have included corrugations, formed in sheet metal or metal plates, to guide movement of the granular material. Multiple short knobs of molded metal have also been suggested. But prior proposals addressing this difficulty have generally been unduly expensive or have not fully met the abrasion problems presented.
Further, in the sizing of granular material such as coal, screen deck systems in a granule sizing machine or classification machine are used for receiving and sizing the coal. These screens are generally angularly disposed to receive a stream of coal or granular material from the discharge end of a conveyor. A screen impact surface for receiving the stream of coal or granular material is usually at the input end of the first or uppermost screen. Wear on the impact surface requires periodic replacement or repair of the screen.
SUMMARY OF THE INVENTION
It is a primary object of the present invention, therefore, to provide a new and improved impact liner for an impact surface of a conveyor chute or screen deck, input or output, that is simple and inexpensive to manufacture and to install on the impact surface, which impact liner is effective to minimize or even eliminate the problem of abrasion from conveyance of a granular material.
It is a further object of the present invention to provide a new and improved conveyor impact liner for a granular material impact surface that utilizes the granular material itself in reducing wear on the impact surface.
A further object of the invention is to provide an impact liner or member for a screen deck impact area to reduce wear of the screen.
Accordingly, the invention relates to a chute liner or impact member for an impact surface of an input chute or discharge chute or a screen deck for a conveyor bearing granular coal, aggregate, or other granular material within a given granular size range. When used in a chute, it will be mounted on at least one impact surface against which the granular material impacts when the material is input to or discharged from the conveyor. When used for enhancing the life of a screen deck, the impact member will be mounted on the screen deck impact area. It should also be appreciated the impact liner of the invention may be used to enhance the life of any granular material impact area.
The chute or impact liner includes a base plate of molded elastomer having a base portion conforming to the impact surface of the chute or screen deck. It should be appreciated that the liner may be molded from any suitable elastomeric material. A multiplicity of elastomer knobs are molded integrally with the base plate; they project toward the interior of the chute or impact surface when the liner is mounted on the impact surface of a chute or other member. The knobs may be of truncated conical configuration or any other suitable configuration and are spaced from each other by distances greater than the size of the smaller granules of the granular material so that some of the granular material accumulates between the knobs to afford a renewable wear surface. There are also means for mounting the liner to a conveyor impact member, with the base of the liner covering at least a portion of the inner impact surface of the member.
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Arch Environmental Equipment Inc.
Bidwell James R.
Zickert Lloyd L.
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