Conveyors: power-driven – Conveyor section – Flight means in conduit for lifting flowable solid material
Patent
1983-05-31
1989-10-03
Spar, Robert J.
Conveyors: power-driven
Conveyor section
Flight means in conduit for lifting flowable solid material
198729, 198733, B65G 1914
Patent
active
048710601
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a scraper conveyor of the type comprising a conveyor chain or wire, which is provided with a plurality of transverse scraper members and passes along a closed path at least partly defined by stationary conveyor channel or tube means extending from a material inlet station and past one or more receiver stations, in which the material is dispensable through outlet openings in said channel or tube means, the conveyor chain or wire being driven by means of a driving wheel engaging with said transverse scraper members. Such conveyors are widely used e.g. as feedstuff conveyors for distributing feedstuff to a plurality of feeding places in different types of animal houses.
The transverse scraper members are normally made as circular discs which are centrall rigidly associated with respective chain links or with the wire with constant mutual spacing e.g. fine cm, and the driving wheel is a sprocket having radial teeth or projections drivingly cooperating with the rear sides of the scraper members as the conveyor chain or wire passes about a portion of the sprocket circumferences.
In the following reference will be made solely to circular scraper discs as provided on a wire, concentrically therewith, but it will be appreciated that the invention will even apply to conveyors in which the scraper members are mounted on a chain and/or in which the scraper members are not exactly circular or concentrically arranged on the chain or wire.
As in case of a sprocket driving a chain it is desirable that the driving sprocket cooperates with several scraper discs at the same time, i.e. the discs should be provided with a highly uniform mutual spacing on the wire. This is in fact achievable, normally by die casting the discs directly on the wire with the required intervals therealong, whereby the discs may at the same time be stabilized against tilting on the wire, viz. by being shaped with a central hub portion of increased axial length.
In practice, however, the driving of the conveyor wire causes considerable problems with respect to the uniform distribution of the driving force between the various scraper discs as being present on the sprocket at any time. Even small differences in the unavoidable wear on the rear sides of the discs as cooperating with the sprocket may change the effective pitch of the discs, and so may feedstuff deposits on the rear sides. A special problem resides in the joining of the opposed wire ends for the forming of a closed wire loop or endless conveyor wire, because it is hereby rather critical that the wire ends be joined so as to provide for the required exact standard spacing between the discs at both sides of the joint.
It is the purpose of the invention to provide a conveyor of the above-mentioned type in which the moved conveyor element is drivable without particular problems arising from a possible non-constancy of the effective pitch of the scraper members as engaged by the driving wheel of the driving station.
According to the invention the driving wheel is a circumferentially substantially smooth wheel having an outer cross sectional shape which conditions a frictional engagement between the wheel and the wheel periphery engaging portions of the outer edges of the scraper members, means being provided for tightening the moved element of the conveyor about the driving wheel sufficiently to ensure a firm frictional engagement between these parts.
Hereby the driving engagement between the driving wheel and the conveyor wire will be entirely independent of the exact distance between the consecutive scraper discs, because the driving engagement is established between the smooth circumference of the driving wheel and the outer edge portions of the consecutive scraper discs, without specific relevance to any exact location of the rear sides of the scraper discs.
Preferably the driving wheel is profiled with a recess operable to receive approximately one half of the discs and to frictionally engage the discs adjacent almost diametrically opposite edge portions t
REFERENCES:
patent: 2326535 (1943-08-01), Hapman
patent: 2333926 (1941-01-01), Hapman
patent: 2357651 (1944-09-01), Hapman
patent: 2692067 (1949-06-01), Hapman
Dahl Christian
Dall Thoge
Gastineau Cheryl L.
Spar Robert J.
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