Conveyors: power-driven – Conveyor section – Endless conveyor
Reexamination Certificate
1998-12-28
2001-02-13
Hess, Douglas (Department: 3652)
Conveyors: power-driven
Conveyor section
Endless conveyor
Reexamination Certificate
active
06186317
ABSTRACT:
The invention concerns a reversible belt steering assembly for centring conveyor belts, comprising a rotating mechanism which is rotatable about an axis perpendicular to the conveyor belt and which supports at least one steering roller for the conveyor belt, and a first transfer mechanism which supports first guide rollers, wherein the guide rollers of the conveyor belt are guided laterally in relation to the conveyor belt's longitudinal direction, and where in the event of a lateral misalignment of the conveyor belt from a neutral position for the conveyor belt and the belt steering assembly the first transfer mechanism transfers the guide rollers' movement to the rotating mechanism for rotation of the steering rollers to a position in which they steer the conveyor belt back to the neutral position
The belt steering assembly is used to guide the conveyor belt 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 rotatable 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 base 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.
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 far smoother movement of the conveyor belt and consequently less wear and a longer working life. The belt steering assembly which is described in NO 178 853, however, only works when the belt is moving in one direction, which is not adequate for a number of purposes.
The object of the invention is to provide a belt steering assembly which can be used to steer a reversible conveyor belt in both directions of travel.
This object is achieved according to the invention with a belt steering assembly of the type mentioned in the introduction, characterized by the features which are indicated in the claims.
Thus the invention consists in a belt steering assembly comprising a rotating mechanism with at least one steering roller. Depending on the belt's direction of travel the rotating mechanism with the steering roller can be controlled by means of a switch mechanism by two different sets of guide rollers, with the result that the steering roller returns the belt to its neutral position.
In a preferred embodiment the transverse stay with the guide rollers is located perpendicular to the conveyor belt's longitudinal direction, and the transfer of movement from the guide rollers to the steering roller is implemented with the type of mechanism which is described in NO 178 853.
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Gaarden Kjell Arne
Hovsto Kenneth
A/S Techno Track
Hess Douglas
Young & Thompson
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