Agitating – Having interrelated feed and discharge means
Patent
1997-12-09
1999-10-19
Soohoo, Tony G.
Agitating
Having interrelated feed and discharge means
3661531, 366186, B01F 1502
Patent
active
059676566
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention relates to a method and an apparatus for homogenizing bulk material, comprising a container having a rear end wall and a front end wall and two side walls, a feeding in conveyor for feeding in bulk material from above into the container, which is provided to accommodate a bed of bulk material, the extension of said bed being limited by the end walls and the side walls; and a feeding out conveyor at the lower part of the container, said feeding out conveyor extending at least between the end walls and being exposed against the bulk material between the two end walls and provided to feed out the bulk material in a direction towards the front end wall.
BACKGROUND OF THE INVENTION
Bulk material containing solid particles usually has a varying particle size distribution and/or mass distribution.
In the handling of such bulk material, which may consist e.g. of gravel, sand, asphalt or gravel mixtures, asphalt-concrete, moist concrete, or the like, the bulk material usually is separated into fractions containing coarser and finer particles. When a container is being filled with that type of bulk material by supply from above, e.g. from a point, the bulk material will form slope sides in the container along which coarser and/or heavier particles will fall down and collect at the foot of the slope to a greater degree than finer and/or lighter particles will do. This separation process occurs if the bulk material has a dry consistency, such as gravel, but also in the case of moist bulk material, such as wet cement-concrete wherein coarser and/or heavier particles will drop to the bottom of the container to form slopes in a corresponding way. This will cause a separation inside the container into regions containing coarser and/or heavier particles and regions containing finer and/or lighter particles, but the sizes of these regions will depend on variations in composition of the supplied bulk material. During the feeding out of the bulk material from the container by means of continuously working conveyors, such as worm conveyors, endless conveyor belts, continuously working scraper conveyors, tube conveyors and the like, the size and/or mass distribution of the particles will vary in the fed out material. For example, at the feeding out of asphalt mixtures for road surfacing one has observed a separation of the particle shaped material into coarser and finer fraction, in the road surface, which has led to impaired wear resistance due to the fact that a certain size fraction may be missing while an other one may exist in excess although the material which was supplied had a proper particle size distribution.
BRIEF DISCLOSURE OF THE INVENTION
The overall purpose of the invention is to solve the above mentioned problem. The invention herein takes advantage of the observation that, when a bulk material is supplied from above to a container from essentially a point, or possibly along a line, the bulk material will be fractioned in the container in the above mentioned way, which means that a supply of bulk material having a certain particle size and/or mass distribution, or a supply of bulk material having a particle size and/or mass distribution varying over time, to a certain degree will be fractioned in a predictable way according to its particle size and/or mass distribution. This observation is taken advantage of according to the invention in that the feeding out conveyor is dimensioned and designed such that it will feed out the bulk material with a volume per time unit and length unit of the feeding out conveyor adapted to the fractioning which did occur in the container, with the result that the fed out bulk material will achieve a particle size distribution corresponding to that of the bulk material which was fed in, and the same time as the particle size distribution will be homogenized, utilizing the previous fractioning in the container known by experience.
More particularly, the above is achieved according to the invention in that the feeding out conveyor is designed such
REFERENCES:
patent: 4201484 (1980-05-01), Sasiela et al.
patent: 4449908 (1984-05-01), Campbell
patent: 4559104 (1985-12-01), Eriksson
patent: 4710032 (1987-12-01), Nordlund
patent: 5052874 (1991-10-01), Johanson
Andersson Conny
Fredriksson Lars-.ANG.ke
Dynapac International Aktiebolag
Soohoo Tony G.
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