Conveyors: power-driven – Conveyor having impinging fluid to feed – shift or discharge... – Having cleaning means
Reexamination Certificate
1999-09-01
2001-06-05
Ellis, Christopher P. (Department: 3651)
Conveyors: power-driven
Conveyor having impinging fluid to feed, shift or discharge...
Having cleaning means
C198S497000
Reexamination Certificate
active
06241075
ABSTRACT:
FIELD OF THE INVENTION
The invention relates to a device for cleaning conveyor belts which are provided for heavily soiling bulk goods, such as wet coal, clay or the like.
Such devices in the form of strippers are known.
BACKGROUND OF THE INVENTION
Caking of the conveyor belt occurs nonuniformly over the width of the belt and the length of the belt. The caking adheres nonuniformly firmly to the belt; it is also nonuniform in terms of its layer thickness.
So called end strippers are strippers which are fitted at the belt discharge point, directly under the discharge parabel, at the drive roller; they remove the caking on the conveyor belt more or less intensively. Transversely acting strippers at the discharge point are frequent.
Such transversely acting strippers, known in practice, may be subdivided into those which effect more intensive cleaning and those which effect less intensive cleaning. The so-called slat stripper has primarily become widespread nowadays as a transversely acting stripper. However, this stripper only satisfies the object set to a certain extent. It comprises a steel housing or an axle equipped over its length with a number of flat slats or modules. These are spring-mounted and thus bring about a different contact pressure, but this is uniform only over the respective track width.
The contact pressure of the conveyor belt against the drive drum is very high, caused by the high tractive force of the drum, as a result of which relatively low elevations or depressions in the belt only ever allow the slats to act at the highest point of the unevenness. If an encrustation on the belt cannot be detached by the slats, or if the belt has not been repaired, by means of applied patches, in such a way that the belt surface is completely even, in the surrounding area the adhering soiling on the belt is not stripped off. If, in addition, the belt is further damaged by depressions (grooves or detached, upper belt-ply cover sheets), then the soiling remains adhering there as well.
The same is to be feared when the drive drum has worn nonuniformly and, as a result, the belt surface in the region of the strippers is not even. In order to permit the conveyor belt to move to the left and right, the drive drums are often crowned, that is to say their diameter decreases from the center toward the ends, which means that the drive drum is highest at the center. In the case of such crowned drums, cleaning using standard transversely acting strippers cannot be achieved at all.
SUMMARY OF THE INVENTION
Surprisingly, according to the invention these disadvantages are eliminated by a resilient, fluid-loaded transversely acting stripper which is arranged transversely with respect to the movement of the conveyor belt, at the point of reversal of the belt or shortly below said point.
A transversely acting stripper itself is expediently not of segmented construction.
The transversely acting stripper may advantageously have a shape which follows that of the deflection drum, which may in particular be of crowned design.
The transversely acting stripper expediently comprises a steel enclosure with an incorporated or attached resilient stripper.
It is particularly expedient for the resilient transversely acting stripper to be loaded or to be able to be pressed against the conveyor belt pneumatically.
It is particularly beneficial if the stripper housing is designed to be inherently twisted, especially by 10° over its length.
A resilient pressure chamber may be arranged between housing and stripper.
The stripper element is preferably composed of polyurethane or multi-layer rubber and, if appropriate, abrasive material with ceramic platelets cast in, adhesively bonded in or scattered in.
The pressure chamber that loads the stripper element may be connected by a connecting line to a reservoir provided with a regulator.
REFERENCES:
patent: 4105109 (1978-08-01), Schultz
patent: 4257517 (1981-03-01), MacPherson et al.
patent: 4269301 (1981-05-01), Gibbs
patent: 4290520 (1981-09-01), Rhodes
patent: 4694952 (1987-09-01), Meijer
patent: 4768645 (1988-09-01), Farris
patent: 4781284 (1988-11-01), Birkheuer et al.
patent: 4888200 (1989-12-01), Milliken
patent: 4962845 (1990-10-01), Gibbs
patent: 5213197 (1993-05-01), Mohri
patent: 5248026 (1993-09-01), Morefield
patent: 5339947 (1994-08-01), Campanile
patent: 5622249 (1997-04-01), Morin
patent: 5628392 (1997-05-01), Stoll et al.
patent: 5722528 (1998-03-01), Dolan
patent: 6003657 (1999-12-01), Mott
patent: 6041913 (2000-03-01), Dolan
patent: 6056111 (2000-05-01), Stoll et al.
Dishong George W.
Ellis Christopher P.
Maschinenbau Krumscheid GmbH
Tran Khoi H.
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