DEVICE AND METHOD FOR OPTICALLY SORTING BULK MATERIAL

摘要

A description is given of a device and a method for optically selecting constituents of at least one fraction from a bulk material stream conveyed along a conveying direction, with a camera unit, the camera viewing direction of which is directed at the bulk material stream, a background arranged behind the bulk material stream in the camera viewing direction, the colour of which background can be adapted to the colour of a selected fraction of constituents of the bulk material stream, an evaluation and control unit, which is connected to the camera unit and in which control commands for a separating unit can be generated according to a decision criterion, which separating unit, upon driving, is able to separate the constituents to be selected from the bulk material stream. The invention is distinguished by the fact that the camera unit is a spatially resolving camera and has at least two, preferably three, colour channels which each have different spectral sensitivity ranges, that the background has a multiplicity of individual luminous means, of which each individual luminous means emits light with a spectral distribution adapted to a respective spectral sensitivity range of the camera unit, that the evaluation and control unit comprises a unit for determining the spatial profile of the colour or colour values of a constituent of the bulk material stream transversely with respect to the conveying direction, and that the evaluation and control unit contains a regulating module that sets the individual luminous means with regard to their brightness in such a way that the colour of the background assumes the spatial profile of the colour value determined.