Classifying – separating – and assorting solids – Sorting special items – and certain methods and apparatus for... – Condition responsive means controls separating means
Patent
1999-01-29
2000-06-20
Nguyen, Tuan N.
Classifying, separating, and assorting solids
Sorting special items, and certain methods and apparatus for...
Condition responsive means controls separating means
209587, 209938, 250226, 356406, B07C 5342
Patent
active
060780185
ABSTRACT:
Sorting apparatus has a conveyor belt or equivalent mechanism for moving particles at a speed sufficient to generate a stream of particles in air, which particles can be graded such that selected material can be removed. The grading or sorting is conducted by a primary scanning system for analysing light reflected from particles in the stream in a plurality of wavelength ranges. Ejectors for removing particles from the stream are disposed downstream of the scanning system, and are instructed in response to signals received from the scanning system. An auxiliary scanning system is also included to establish the presence of material in the stream, and in the event that a void is detected in a given region, then the analysis of that region by the primary scanning system and any corresponding activation of the ejectors is inhibited. If the auxiliary scanning system operates on the basis of light transmitted in the infra-red wavelength, then the scanning system can differentiate between a situation in which it is receiving light reflected from a product piece in a product stream, and light transmitted across the path of the product stream in the absence of a product piece therefrom. By this means, the monitoring of light received from the path of the product stream in the infra-red range can be used to perform all functions.
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Davis Robert
Fraenkel Herbert
Henderson Kenneth
Nguyen Tuan N.
Sortex Limited
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