COLOR SORTING APPARATUS FOR GRANULAR OBJECTS WITH FUNCTION TO SORTING OUT FOREIGN MAGNETIC METAL MATTERS

摘要

A magnetic metal removing device for color sorting apparatus includes a hollow feeding roll (6). Within a hollow portion of the feeding roll, a magnet (9) is arranged such that it closely opposes to a part of an inner surface of the hollow feeding roll to form a magnetic force active surface (C) on the corresponding outer surface of the feeding roll. Magnetic metal mixed in raw granular objects is attracted on the magnetic force active surface. The magnetic force active surface (C) changes to a magnetic force inactive surface (D) as the feeding roll rotates. The magnetic metal caught on the feeding roll is released from the magnetic force inactive surface (D) and colleted by a collecting device (11).