Conveyors: fluid current – Miscellaneous
Reexamination Certificate
2000-06-23
2001-10-09
Ellis, Christopher P. (Department: 3651)
Conveyors: fluid current
Miscellaneous
C406S110000, C406S138000, C406S146000
Reexamination Certificate
active
06299387
ABSTRACT:
The present invention relates to a method for evacuating storage spaces for bulk goods, preferably granulate material, e.g. cereal grain, by means of an evacuation conveyor constituting the floor of the silo, which is provided with perforations arranged in bands as passages for air flows, which are directed along the floor and blow the bulk material towards an outlet, an outlet chute or the like. The invention also relates to an evacuation conveyor.
BACKGROUND OF THE INVENTION AND UNDERLYING PROBLEM
Silos for cereal grain and the like are evacuated by means of allowing the grain to flow out through an outlet in the bottom of the silo. In order to be able to utilize the volume of the silo to the greatest possible extent, the silo bottom is conveniently arranged in a horizontal direction, resulting in the formation of a remaining residue of bulk goods, corresponding to the angle of repose of the material in question, which has its largest height at the silo walls and slopes towards the outlet or the outlets. Thereby, it is desired that this remaining material is evacuated by means of an evacuation conveyor, which consists of a floor having a number of bands of perforations, through which perforations jets of pressurized air directed along the floor pass, and bring the bulk goods into movement towards an outlet opening or the like. SE 218067 C and SE 459 575 B are examples of previously known devices of this type.
A disadvantage with these previously known devices is that the pressurized air locates passages in which the lowest resistance prevail, i.e. where the layer of bulk goods is the thinnest, thereby leaving the thicker portions more or less unaffected. In the positions where the pressurized air has been able to transport away the goods, empty or sparsely coated floor areas are created, and a considerable portion of the pressurized air flows out from the silo without having been effective in the displacement of the cereal grain.
PURPOSE OF THE INVENTION AND SOLUTION TO THE PROBLEM
The purpose of the invention is to achieve an evacuation conveyor:
which occupies a very small storage volume,
which evacuates the space nearly up to 100% without any manual operation,
a which consumes considerably less air than the previously known, corresponding devices
which has a modular construction and is easy to transport and assemble,
which is no more expensive than conventional devices
which lacks movable parts,
which easily can be adapted to transport different types of granular material
These objectives have been achieved by means of causing at least portions of the perforation bands closest to the side walls of the storage space, and some of the bands along essentially their entire and/or part of their length, to emit an air stream which in quantity and/or pressure differs from the air stream emitted in the remaining perforation bands.
REFERENCES:
patent: 4082205 (1978-04-01), Kluger et al.
patent: 4088373 (1978-05-01), White
patent: 4508474 (1985-04-01), Frederick
patent: 4560094 (1985-12-01), Eales
patent: 5335828 (1994-08-01), Kaiju et al.
patent: 5346101 (1994-09-01), Hargis et al.
patent: 37 17 490 A1 (1988-12-01), None
patent: 2.032.124 (1970-11-01), None
patent: 218 067 (1968-01-01), None
patent: 414 161 (1980-07-01), None
patent: 459 575 (1988-09-01), None
patent: WO 88/06560 (1988-09-01), None
Dillon, Jr. Joe
Ellis Christopher P.
Marshall Gerstein & Borun
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