Conveyors: power-driven – Conveyor section – Endless conveyor
Patent
1998-12-28
2000-10-17
Ellis, Christopher P.
Conveyors: power-driven
Conveyor section
Endless conveyor
198808, 198840, B65G 3916
Patent
active
061317268
DESCRIPTION:
BRIEF SUMMARY
The invention concerns a belt steering assembly in a conveyor for centring conveyor belts, wherein belt, which steering bracket is rotatably attached to a first fulcrum whose axis extends perpendicularly to the conveyor belt, and where at a distance in the belt's transport direction from the first fulcrum via a first rotating joint the steering bracket is connected to direction, and which at a distance in the belt's transport direction from the first rotating joint is attached to a second fulcrum whose axis extends perpendicularly to the conveyor belt, and at a distance in the belt's transport direction from the second fulcrum via a second rotating joint is connected to of the belt's outer sides, for reacting to a lateral displacement of the conveyor belt, which guide bracket is connected via a third rotating joint to third fulcrum, whose axis extends perpendicularly to the conveyor belt.
Use of the belt steering assembly for steering a conveyor belt during loading, wherein a laterally adjustable conveyor belt is moved past a loading device for loading of a preferably granulated material, and where the centre of gravity of the loaded material falls at the side of the conveyor belt's central portion when the conveyor belt is located in a neutral position:
Belt steering assemblies are used amongst other things to guide conveyor belts in processing plants for various types of materials such as granulated ores.
In De 174491 there is disclosed a conveyor belt device for correcting lateral misalignments which occur during operation and thus return the belt to its normal position. A set of steering rollers for the conveyor belt is mounted on a plate which is rotatably attached to the base. On to the roatable plate there is mounted an arm with a transverse stay. The arm may be jointed and rotatable about a rotating joint which is attached to the base. To the transverse stay there are attached guide rollers which run along the edge of the conveyor belt, and which in the event of a lateral misalignment of the belt transfer the displacement to the transverse stay. The displacement is transferred to the lever arm, which in turn transfers the displacement to the plate with the result that the axes of the steering rollers are tilted, thus returning the conveyor belt to its normal position.
In NO 178 853 there is disclosed a belt steering assembly of a similar type, but where the lever arm is rotatably attached both to the plate which holds the steering rollers and the transverse stay which holds the guide rollers. The lever arm is rotatably attached at a fixed point located at a distance from the rotating fastenings in the plate and the transverse stay, and a rotatable parallel stay is mounted parallel to the lever arm, between the transverse stay and a fixed based in the form of a beam, with the result that the transverse stay always remains standing at right angles to the conveyor belt's centre line.
Norwegian patent application 962268 describes a reversible belt steering assembly where the actual steering function is implemented in the same way as in NO 178 853, but where there are two sets of guide rollers arranged on opposite sides of the steering rollers, and where the guide rollers can be connected and disconnected in relation to the steering rollers by means of a switch mechanism, depending on the belt's direction of travel.
Known belt steering assemblies of the type which is described in DE 174491 and similar types have a tendency to cause wandering and misalignment of the conveyor belt, especially when there is uneven loading or uneven weight distribution, thus causing wear along the edges of the belt.
In comparison with these other known belt steering assemblies the belt steering assembly which is disclosed in NO 178 853 provides a smoother movement of the conveyor belt and consequently less wear and a longer working life.
Steering of the conveyor belt with a belt steering assembly as described in NO 178 853, however, is not without problems, since both understeering and oversteering can occur, with consequen
REFERENCES:
patent: 3058574 (1962-10-01), Gianukos
patent: 5743378 (1998-04-01), Hovsto et al.
Gaarden Kjell Arne
Hovsto Kenneth
A/S Techno Track
Deuble Mark A.
Ellis Christopher P.
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