Conveyors: power-driven – Conveyor section – Endless conveyor
Patent
1990-02-07
1991-07-02
Valenza, Joseph E.
Conveyors: power-driven
Conveyor section
Endless conveyor
198833, B65G 1508
Patent
active
050279432
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention generally relates to a belt conveyor and specifically to one having high transport capacity and capable of operating under rough service conditions for conveying such materials as coal, ore, and chemicals.
More precisely, the invention relates to a belt conveyor comprising an endless belt which has a bottom portion provided on its underside with a central bead, the underside of which is formed with a groove for receiving a carrying cable at least along the major part of the goods conveying reach of the conveyor, and a plurality of pulleys arranged below the carrying cable and adapted to directly support the carrying cable.
A first object of the present invention is to improve the guiding of the belt, at the same time as the costs for manufacture, assembly, operation and maintenance of the belt conveyor are kept low. Such improved guiding makes it possible to drive the belt both at high speed and safely through curves.
This object is achieved in that the belt conveyor according to the invention is characterised by guide rollers arranged at least along the goods conveying reach and engaging the lateral surfaces of the bead, the width and depth of the groove being such that the guide rollers are capable of transmitting lateral forces to the cable, and the guide rollers making such contact with the lateral surfaces of the bead that the bead is substantially immobile in a vertical direction, and guide means arranged along the goods conveying reach and engaging with the belt to prevent it from tipping from the carrying cable.
In the belt conveyor according to the invention, the belt can thus be said to balance on the carrying cable which takes up the entire or substantially the entire weight of the conveyor belt and the goods conveyed therein. As a result, the bead can be manufactured without any special reinforcement means, which reduces the production cost, and the pulleys along the straight sections of the belt conveyor can be widely spaced apart, which brings a further reduction of the cost.
If the diameter of the carrying cable is made, for example, substantially equal to the width of the groove and smaller than the depth of the groove, the guide rollers arranged along the goods conveying reach and engaging the lateral surfaces of the bead can keep the bead correctly positioned in both the vertical and the horizontal direction relative to the carrying cable. The guide rollers can also be used to provide higher friction between the carrying cable and the bead, if required, for example when conveying goods at steep angles, and also to absorb the lateral forces that arise when the conveyor belt passes through a curve.
The inventive design of the guide rollers and the lateral surfaces of the bead, combined with the bracing action of the guide rollers on the bead in the lateral direction transversely of the travelling direction of the belt, prevents the belt from running off the carrying cable.
To obtain optimal power transmission from the guide rollers to the carrying cable, the center plane of the guide rollers is preferably coincident with the center line of the carrying cable. Furthermore, the lateral surfaces of the bead may conveniently have projecting portions for engagement with the guide rollers.
Since the groove in the bead has substantially the same width as the diameter of the carrying cable, the conveyor belt and the carrying cable can be conducted along separate paths, where this is required. This is especially suitable at the turning points of the belt conveyor, where terminal deflecting pulleys can thus be arranged for the carrying cable, together with separate terminal belt deflecting rollers disposed outside the terminal deflecting pulleys.
The possibility of removing the carrying cable from the bead is also particularly convenient at intermediate driving stations at which the carrying cable is conducted, along a given distance, in a path deviating from the path of the belt. The carrying cable which thus also serves as the driving cable, can have an
REFERENCES:
patent: 826312 (1906-07-01), Catlin
patent: 3164238 (1965-01-01), McCullagh
Tingskog Lennart
Valenza Joseph E.
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