Classifying – separating – and assorting solids – Plural – diverse separating operations – Including sorting of special items or sorting by methods or...
Patent
1982-12-27
1985-10-29
Scherbel, David A.
Classifying, separating, and assorting solids
Plural, diverse separating operations
Including sorting of special items or sorting by methods or...
209690, 209473, B07C 304
Patent
active
045496609
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention relates to a drum having at least one section for separating a bulk material into a heavier and a lighter fraction. More particularly the invention relates to a drum which is designed to be rotated around its horizontal or possibly slightly inclined central axis at a certain speed and to be traversed by a flow of air having a certain flow velocity, besides which the drum has at least one discharge aperture for the heavier fraction and at least one discharge aperture for the lighter fraction located further on in the drum viewed in the direction of air flow. In particular the invention relates to a drum having a section for separation of chopped harvested crops which contain a mixture of grains and lighter components, so that it is possible to obtain the grains separately and straw and other lighter components separately.
BACKGROUND
In Swedish patent application Nos. 8000682-8, 8003989-4 and 8003990-2, filed by the same applicant, a description is given of equipment appertaining to the technical field described above. By means of these proposed inventions, equipment has been created for drying, threshing and separating a harvested crop which contains components of different types, in such a way that none of the components suffers damage, but instead can be kept for use in the most suitable manner. A very high degree of separation of the grain from the chopped harvest crop lighter components has also been achieved, which is a pre-requisite for good overall economics on the part of the plant.
DESCRIPTION OF THE INVENTION
The aim of the invention is to offer a modified, improved separation drum. In particular one aim is to design the separation drum in such a way that the degree of separation and the capacity of the drum can be calculated mathematically and be predicted even on the drawing board, which is of decisive importance for optimising the dimensions of the installation and the design of detailed components, all with the aim of reducing plant costs and of being able to increase capacity whilst retaining good or improved separation of the more valuable heavier fraction.
These and other objectives can be achieved when the drum, in at least a portion of the same, between the said discharge aperture for the heavier fraction and the said discharge aperture for the lighter fraction, is provided on the one hand with rearward-feeding transport devices in the form of inwardly-directed spirals fastened to the inside of the drum and arranged during rotation of the drum to transport material in the thread turns between the spirals to the rear towards the said discharge aperture for the heavier fraction, also lifters for the bulk material arranged in all thread turns and designed as barriers to prevent continued rearward feed of the bulk material, the said lifters being arranged in groups along the said portion around the inside of the drum, a number of the thread turns, but not all, in each such group containing lifters, the lifters being arranged to have the same or different pitch, but that the pitch or distance between the groups is such and the number of thread turns provided with lifters in at least the majority of the groups is such that during each revolution performed by the drum, in total more material of the heavier fraction is fed rearwards through the free thread turns in these groups than is lifted up by the lifters in the thread turns in the next following group, viewed in the direction of air flow, which are blocked off by lifters and at the air velocity which is matched to suit the drum diameter is blown some distance forward by the air flow when it drops down from the lifter during rotation of the drum, whilst the lighter fraction is blown further on so that the forward feed of this fraction is considerably greater than the rearward feed in the thread turns. The lifters are placed preferably in at the most alternate thread turns in the said groups.
Further characteristics of the invention will be indicated by the patent claims and by the following description of
REFERENCES:
patent: 2577488 (1951-12-01), Stephenson
patent: 4018567 (1977-04-01), La Point
patent: 4187172 (1980-02-01), Datsenko et al.
patent: 4207177 (1980-06-01), Block
patent: 4252642 (1981-02-01), Mohri
Foster Glenn B.
Scandinavian Farming Aktiebolag
Scherbel David A.
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