Dispensing – With discharge assistant – Reciprocating
Patent
1993-09-09
1995-04-18
Kashnikow, Andres
Dispensing
With discharge assistant
Reciprocating
222252, 222233, 222414, B65G 6530
Patent
active
054071038
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a means for discharging particle material from a container, preferably having circular cross section, with a bottom in the form of a fixed table to support the particle material in the container, said means comprising a feed unit which is movable in relation to the table and disposed close to the upper side of the table, for discharging the particle material from the container through an outlet means, and drive means for driving the feed unit, said feed unit having substantially vertical feeding surfaces facing the outlet means, said outlet means comprises at least one substantially horizontal outlet opening, extending around at least the main part of the table at a distance from its center and which is defined along at least one side by an edge of the table, said feeding surfaces of the feed unit extending all around the table, and said feed unit being arranged to be moved by said drive means during a cycle of movement with altered directions of feed towards the outlet opening so that during the cycle of movement particle material is fed out to substantially all parts of said outlet opening, and also so that the area of the feeding surfaces which is active for feeding is substantially constant throughout the cycle of movement.
BACKGROUND OF THE INVENTION
Description of the Prior Art
A number of devices have been suggested for feeding out particle material, such as movable arms or blades which rotate or oscillate to and fro and are usually intended for use in combination with one or more screws. It is also usual to use only a screw arrangement to feed out the material. Other examples are feeders with slats or scrapers which bring with them the material to an outlet opening, the slats or scrapers may move to and fro or they may be disposed on a continuous belt. A problem encountered with most known feeding devices is that they do not give a uniform flow of material down through the container seen in cross section. Instead the flow may be greater on one side than on the other or the flow in the middle of the container may differ from that at the walls. The problem is particularly serious when the material is to be treated with a treating agent in gaseous or liquid form at or without increased temperature since the quality of the material will be uneven due to the fact that it will be treated for varying lengths of time as a result of varying flow rates seen in a cross section of the container. An example of such an application is in the pulp industry when steaming chips. Before being fed into a digester the chips are treated with steam in a chip bin in order to heat the chips to a desired high temperature and at the same time to remove air from the interior of the chips. It will be understood that with the varying flow rates described in the chip bin, the steamed chips fed out will vary in quality so that the chips will have different temperatures and varying amounts of retained air.
GB-948 444, NO-129 085 and EP-A1-0 247 682 describe various devices for discharging particle material. The known devices have one or more of the drawbacks discussed above. EP-A1-0 247 682 is not useful for chips, either, since it utilizes eccentric rings which feed the material in two opposite directions towards adjacent outlet openings at both sides of each ring. Owing to the oblong thin shape of the chip it is not possible to repeatedly change its feeding direction when a uniform flow is to be obtained.
SUMMARY OF THE INVENTION
The object of the present invention is to essentially reduce the above-mentioned problem and provide a means discharging the material in such a manner that the flow in the container becomes more uniform in a cross section through the column of material. Bases are thus created for achieving a more uniform quality in the material fed out of the container and which is treated in the container with a suitable fluid, e.g. steam or moist, heated air.
The invention is substantially characterized in that said feed unit comprises at least two spac
REFERENCES:
patent: 2896824 (1959-07-01), Sheldon
patent: 4043488 (1977-08-01), Halvorsen et al.
patent: 4129234 (1978-12-01), Conca
Clarstrom Bo
Jonsson Lennart
Oulie Finn
Kamyr Aktiebolag
Kashnikow Andres
Pomrening Anthoula
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