| 摘要 |
A particle scattering prevention device for use in a color sorting apparatus for sorting particles according to their colors, the apparatus being of the type having a photoelectric sorting chamber accommodating a photoelectric detectors; and a blowing nozzle device adapted to operate in response to the detection output from the photoelectric detector to selectively blow air to the flow of particles to sort out the particles of the different color. The device has a scattering prevention wall disposed between the photoelectric detector and the blowing nozzle device and having a passage bore to permit the flowing particles to pass therethrough, thereby to divide the space in the photoelectric sorting chamber into a light detecting section and a blowing sorting section. Thanks to the provision of the scattering prevention wall, the dusts and particles suspended by the blown air in the blowing sorting section are prevented from coming into the light detecting section to eliminate the erroneous sorting operation attributable to the presence of dusts and particles in the light detection section. The undesirable attaching of dusts to the photoelectric detectors, as well as suspension of particles by the air, is suppressed further by means of a suction blower connected to the blowing sorting section, or means forming air curtains in parallel with and in the close proximity of transparent window plates of optic detection chambers housing the photoelectric detectors. |
