Classifying – separating – and assorting solids – Sorting special items – and certain methods and apparatus for... – Separating means
Patent
1981-11-06
1984-09-04
Reeves, Robert B.
Classifying, separating, and assorting solids
Sorting special items, and certain methods and apparatus for...
Separating means
209369, 209370, 209390, B07C 536, B07B 122
Patent
active
044692307
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention refers to a sorting cylinder for seeds and other grains with a horizontal, driven calibrating cylinder resting on rolls as well as a stationay machine casing surrounding the calibrating cylinder which has an inlet for the material to be sorted and means to lead off the fractions as well as at least one detachable longitudinal side wall.
BASIC STATE OF THE ART
Such sorting cylinders to which the invention refers are used for the exact separation by size of mixed grains. In case of seeds, for example, Indian corn grains, the grains must be sorted within a very narrow range of sizes. On the other hand, the size of the seeds is a quality criterion and, on the other hand, each individual grain must be separated from the entire amount of grain for the sowing machine by means of corresponding allotment systems and must be individually sown by the machine. The more uniform the outside dimensions of the grains are, the more trouble-free the sowing will take place. However, a comparatively exact classification by size is also known in connection with other seeds, such as, for example, wheat, rye, rice, soybeans, grass seed, etc. Furthermore, size is, for example, also a quality criterion in case of coffee beans. A typical characteristic of such sorting cylinders lies in the exchangeability of the operating or calibrating cylinder, respectively. Depending on the special requirements of a company which, for example, produces or supplies such types of seeds, it can be necessary to use quite different calibrating cylinders. Thus, it happens quite often that the sorting cylinder (which is the actual heart of the entire seed producing system) must be exchanged on a daily basis.
The classic round screens are not suitable for an exchange of the screen drum or the calibrating cylinder, respectively, by the customer and, therefore, cannot be used for this type of specific calibration of the grains (such as, for example, with the production of seed).
It is known from cereal cleaning machines or screening machines, respectively, to have cylinders supported by rolls and to drive them whereby, however, a free exchangeability of the cylinders is not given. In order to cleam or keep free the holes, it is customary in the case of screening machines as well as sorting cylinders to provide cleaning devices (such as, for example, cylindrical brushes or beater shafts) which are arranged axis-parallel to the screening drum and whose bristles or beaters, respectively, act on the screening drum jacket and loosen grains stuck in its screen holes and make them fall down. In this instance, the brush or beater shaft, respectively, is driven either by its own motor or through a separate power transmission through the driving motor of the screening drum; however, often the brushes are only rotated through the friction between their bristles and the screening drum to be cleaned. The given special fastening as well as the drive of the cleaning device represent often a main obstacle for a simple dismounting or remounting of the screening drum. This indicates often also whether a corresponding drum screen is suitable for use as a sorting screen or not. A cumbersome mounting and dismounting of the cleaning device destroys again the advantage of a simple mounting of the screening cylinder. The majority of screening machines do not provide door-like lateral walls.
With a normal screening process, another activity is, as a rule, carried out, i.e. a quantity concentration as in the case of a sand screen or when shifting out foreign matter (dirt, etc.) from cereal. On the other hand, a precise separation of the goods to be sorted into the desired classes by size is expected or sorting cylinders, similar, for example, to the classifying of the balls for ball bearings. It is, furthermore, expected of a sorting cylinder that, with each change in product, it is free from grains of the preceding product or that it can at least be easily made free from them.
In the case of a known sorting cylinder, the shaft stubs, supporting t
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Gorlitz Frank O.
Hohener Werner
Gebrueder Buehler AG
Reeves Robert B.
Wacyra Edward M.
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