Conveyors: power-driven – Conveyor section – Endless conveyor
Reexamination Certificate
2001-05-25
2003-05-20
Valenza, Joseph E. (Department: 3651)
Conveyors: power-driven
Conveyor section
Endless conveyor
C198S834000
Reexamination Certificate
active
06564931
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a belt conveyor having a circulating conveying belt, having carrying rollers, which are arranged between the top strand and the bottom strand of the conveying belt, and having a drive device and a force-transmission device for moving the conveying belt.
BACKGROUND OF THE INVENTION
It is known from practice for force to be transmitted from the drive device to the conveying belt of a belt conveyor via friction fitting. The friction between a driven carrying roller and the conveying belt, for example, may even be sufficient for this purpose. The rest of the carrying rollers are mounted in a movable manner and rotate along.
DE 42 44 170 C2 discloses a belt conveyor having an endless conveying belt, the latter being driven by means of a force-transmission device which is present in the form of a friction wheel. A drive shaft extends beneath the bottom strand of the conveying belt. On the inner radius of the belt curve, a motor is connected as a drive device to the drive shaft and, in the region of the outer radius, a friction wheel is seated on the drive shaft and is in contact with the outer surface of the conveying belt. In this case, the friction wheel interacts with a carrying roller functioning as counterpressure roller. The drive shaft is mounted such that it can be moved at an angle both in the region of the outer radius and in the region of the inner radius of the belt curve. The movable-angle mounting of the drive shaft allows adaptation of the extent to which the friction wheel is pressed against the conveying belt in proportion to the actual load. In this way, the wear is reduced if, in part-load operation, the conveying belt is only subjected to the contact-pressure force which is necessary for this purpose.
Although the belt conveyor known from DE 42 44 170 C2 reduces the wear of the conveying belt, it cannot rule it out altogether. The task of conveying foodstuffs or other goods which are to be kept clean involves, in addition to the mechanical damage to the conveying belt, the aspect of hygiene and of keeping goods clean. The abraded surface particles of the conveying belt could have a considerable adverse effect on the quality of the goods which are to be conveyed. Moreover, the known belt conveyor requires an extremely high level of structural outlay as far as the movable mounting of the separate drive shaft is concerned.
SUMMARY OF THE INVENTION
Taking as departure point the belt conveyor known from DE 42 44 170 C2, the object of the invention is to specify a belt conveyor of the type in question which largely rules out any adverse effect to the surface of the conveying belt of the belt conveyor by the force-transmission device. According to a particularly preferred configuration, the belt conveyor is intended to require just a low level of structural outlay.
The above object is achieved by the features of Patent claim 1. According to the latter, a belt conveyor of the type in question is configured such that a pair of elements which interact with one another with a form fit is provided for force-transmission purposes, and that one element is assigned to the force-transmission device and the other element is assigned to the conveying belt.
According to the invention, it has been found that the surface of the conveying belt is not adversely affected as a result of the action of the force-transmission device if a separate pair of elements is provided in order to realize force transmission. It has also been found that the use of a pair of movement-converting elements which are known per se and interact with one another with a form fit largely eliminates the disadvantages which are known in the case of friction-fitting movement conversion, in particular wear and abrasion.
According to a preferred exemplary embodiment of the belt conveyor according to the invention, the pair of elements could be present as toothed ring and toothed belt, the tooth flanks of the toothed ring and of the toothed belt interacting with one another. It would be possible for the toothed ring to be assigned to the force-transmission device and for the toothed belt to be assigned to the conveying belt.
As far as a particularly low level of structural outlay is concerned, a preferred configuration of the abovementioned exemplary embodiment provides that the toothed ring is assigned to a carrying roller, and the latter thus simultaneously assumes the role of the force-transmission device. Via a journal projecting from the carrying roller, the drive takes place by means of a motor. The toothed ring could be plugged onto the carrying roller and fixed releasably—for example via a shaft/hub connection or a feather key—to the same. In the case of a plugged-on toothed ring, it is advantageous that it is possible to use carrying rollers which are already present. It is particularly advantageous for each carrying roller to be assigned at least one toothed ring. Over the entire running path of the conveying belt, it would then be the case that the toothed belt and the toothed rings interengage and move the conveying belt in a dimensionally stable manner. Corresponding to the toothed ring or rings which is/are arranged between the top and bottom strands and belongs/belong to the preferred configuration mentioned above, the toothed belt is arranged on the underside of the conveying belt, and extends in the running direction of the same. Arranging the toothed belt on the underside of the conveying belt once again ensures that the top side of the conveying belt, which is charged if appropriate with goods which are to be kept clean, is not subject to any force transmission, mechanical damage or production of abrasion particles or other contaminants.
An expedient development of the preferred configuration of the belt conveyor according to the invention makes provision for the toothed ring to be arranged at the end of the carrying roller. As a result, on the one hand, straightforward maintenance of the force-transmission device is made possible and, on the other hand, this arrangement is also more cost-effective than a, for example, central arrangement. Direct force transmission over a short distance is achieved by a journal for the connection of the drive device projecting from that end of the carrying roller which is provided with the toothed ring.
It is particularly advantageous if the toothed belt extends in the region of the side border of the conveying belt. As a result, on the one hand, straightforward production of the conveying belt with the toothed belt is made possible by the direct relationship to the border region and, on the other hand, a role is also played here by the accessibility to the pair of elements for maintenance purposes and, of course, by the coordination between the toothed belt and the arrangement of the toothed ring.
In addition to toothed belts and toothed rings with normal toothing, it would also be possible to realize multisplining. This further reduces undesired sliding and thus wear, heating and noise development. In order to absorb high tensile forces, it would be possible for Kevlar filaments to be incorporated in the toothed belt, which usually consists of plastic. It would be possible for the conveying belt to be produced with the toothed belt by welding, vulcanizing or adhesive bonding.
According to a particularly preferred configuration, it would be possible for the toothed belt to be a constituent part of a toothed-belt component which is of essentially U-shaped design in the transverse direction of the toothed belt. The U-shape makes it possible for the toothed-belt component simply to be plugged onto the border of the conveying belt until the border region has come into contact with the base part between the U-legs. The inner surface of the toothed-belt component may have been provided with adhesive beforehand. As a result of its shaping and of being produced in this way, the toothed-belt component engages around the side-border region of the conveying belt.
While the toothed belt of the conveying belt is subjected
Foley & Lardner
Valenza Joseph E.
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