Conveyors: power-driven – Conveyor having impinging fluid to feed – shift or discharge... – Having cleaning means
Patent
1984-12-03
1987-09-22
Valenza, Joseph E.
Conveyors: power-driven
Conveyor having impinging fluid to feed, shift or discharge...
Having cleaning means
152565, 474 92, B65G 4500
Patent
active
046949526
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention consists of a scraper cleaning apparatus for reversible conveyor belts and includes a first scraper means, mounted in the vicinity of a first discharge station of the conveyor belt, and a second scraper means, mounted in the vicinity of a second discharge station, in which system, dependent on the direction of movement of the conveyor belt, one of the two scraper means is continuously active while the other remains inactive. A conventional apparatus of this type is not detached from the belt, which results in the disadvantage that, in combination with the usual adjusting means, and the applied pressure springs of the independent scraper arms, the scraper blades when inactive keep scraping against the belt, causing accumulation of dirt into undesirable locations, because the dirty side of the belt moves into a position where material, which is to be transported, is discharged onto the belt a couple of yards after passing the inactive scraper blades. Furthermore in the dragging position, the blades are sharpened in such a way that, dependent on the frequency of the conveyor belt apparatus, in combination with the experimentally chosen rubber springs for the scraper blades, the surface layer of the conveyor belt may be seriously damaged, which afterwards makes proper cleaning impossible.
A problem of known apparatuses lies in keeping the scraper blades under constant pressure against the surface to be scraped and cleaned, because the pressure force is affected by wear of the blades, by the different thickness both in the transverse and in the parallel direction of the conveyor belt and by the movement of the belt. Due to these factors in combination with the fact that the scraper means becomes dirty and because the location of the scraper mounting is hard to inspect, in practice the adjusting of the scraper means is a difficult and time-consuming matter.
The adjustment problem of the usual scraper apparatus results in selection of such an adjusting position that the average operation between the periodical adjustments is less than optimal.
SUMMARY OF THE INVENTION
The scraper apparatus for a conveyor belt according to the invention consists of a number of scraper elements, placed in a staggered position, which number depends on the width of the conveyor belt, at one extremity of lever arms, of which the opposite ends are fixed by a vessel means, having a flexible wall which is placed parallel to the support housing and of which the inner side is kept under pressure while the apparatus is in operation, in order to keep the scraper elements against the surface of the conveyor belt with sufficient pressure force.
A second vessel, which acts against the pressure force of the first vessel means will serve to disengage the scraper elements from the conveyor belt surface when the direction of movement of the conveyor belt is reversed.
Furthermore, the second vessel means will serve to affect the oscillatory behaviour of the scraper elements and, when the scraper arms become dirty, they can be tapped or beaten clean against the conveyor belt by alternately exerting higher pressure on the first vessel means or the second, respectively.
The support housing which is fixed at both sides by separate supporting means, consists of two vessel means in which different pressures are maintained and/or are provided with flexible walls of different thicknesses, and made of rubber or synthetic material. The ends of a number of lever arms, which number depends on the width of the conveyor belt, are located between the two vessel means, thus pressing the scraper blades via hinge joints, against the conveyor belt surface to be cleaned.
When using gas under pressure in the vessel means, preferably compressed air, in order to keep the scraper elements against the surface of the conveyor belt, a uniform pressure force is provided right across the conveyor belt, which makes it possible that uneven parts, such as damaged portions or the connecting conveyor belt joint, can freely pass beyond th
REFERENCES:
patent: 3163878 (1965-01-01), Smith et al.
patent: 3748686 (1973-07-01), Winterburn et al.
patent: 3803665 (1974-04-01), Winterburn et al.
patent: 4290520 (1981-09-01), Rhodes
patent: 4529084 (1985-07-01), Zhang
Holmes Jonathan D.
Rodiac Intercessor Ltd.
Valenza Joseph E.
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