Belt conveyor arrangement

Conveyors: power-driven – Conveyor section – Endless conveyor

Patent

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Details

198839, B65G 2314

Patent

active

046090991

DESCRIPTION:

BRIEF SUMMARY
This invention relates to belt conveyor arrangements, for example, for transporting bulk materials over long distances, as for example in transporting coal in a mine.
Such conveyor belts are often laterally steel reinforced and supported at opposite edges by ropes or cables. Such conveyors are expensive and it has been known for the reinforcement to break and collapse between the supporting ropes. Belts composed of steel cord are also used, but these are highly expensive and can be punctured by sharp material. They have been known to split longitudinally.
It is also known, for example, from British Pat. No. 1,591,461, published June 24, 1981, to provide an arrangement in which the belt has longitudinal formations at opposite faces near the edges of the belt, for supporting the belt on continuous ropes or cables. The formations on one face engage the upper run of the ropes and the formations on the other face engage the lower run of the ropes. The ropes follow a tortuous path and are consequently subjected to damaging forces and the face of the belt, which carries bulk material, carries formations which are liable to damage.
The present invention is concerned with providing a belt conveyor arrangement which uses a standard conveyor belting which is cheaper and more reliable.
The present invention provides a belt conveyor arrangement comprising an elongate frame having a roller at each end and a continuous belt passing around the rollers, at least one of the rollers being driven, a multiplicity of rotatable members carried at spaced intervals along the frame and including upper members to support an upper run of the belt and lower members to support a lower run of the belt, a plurality of laterally spaced continuous ropes running around the members, the belt being supported by the ropes, and first means for diverting the path of the lower run of the belt with twisting of the belt as it leaves one of the rollers and for leading the belt back onto the ropes, so that the bottom run is supported on the ropes, and second means for diverting said path again with twisting of the belt and returning the belt below the lower runs of the ropes before the belt reaches the other roller.
In one embodiment, each of the first and second means diverts the path of the lower run of the belt laterally beyond said members and ropes, whilst twisting the belt, before returning the belt back onto the ropes, or back below the lower runs of the ropes, respectively.
In another embodiment, third and fourth means are provided for diverting the paths of the ropes upwardly and downwardly beneath the upper run of the belt to provide space for twisting of the belt beneath said upper run of the belt. This embodiment is preferred, since broadening of the conveyor arrangement near each end is avoided and the whole arrangement is maintained within the confines of the upper run of the belt.
It is preferred that the rotatable members are arranged in transverse rows, each row including more than two members, the members of each row engaging respective ropes.
The belt may comprise longitudinally extending reinforcement and guide strips on one face of the belt, the strips engaging the ropes, and advantageously the strips are shaped to conform to the shape of the ropes.
Magnetic means may be provided to establish attraction forces between the belt and the rotatable members or the ropes to inhibit lateral displacement of the belt.
Reference is now made to the accompanying drawings, wherein:
FIG. 1 is a diagrammatic perspective view of a first embodiment of a conveyor arrangement according to the invention;
FIG. 2 is a detail view of the arrangement;
FIG. 3 is a side elevation of a part of the second embodiment of a conveyor arrangement according to the invention; and
FIG. 4 is a plan view of the second embodiment.
Arrangement of FIGS. 1 and 2 comprises an elongate frame 11, only the uprights 11a of which are illustrated for clarity. The uprights are interconnected by horizontal members, cross-pieces and diagonal braces (not shown) in conventional mann

REFERENCES:
patent: 476787 (1892-06-01), Dale
patent: 870050 (1907-11-01), Robbins
patent: 2582881 (1952-01-01), Mitchell
patent: 2732058 (1956-01-01), Nigra et al.

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