| 摘要 |
A forage harvester has a metal detector with permanent magnets (18-20, 21-23) located within a crop feed roll (10), additional permanent magnets (30, 32) being positioned beyond the ends of the feed roll and at a distance greater than the radius of the feed roll from the axis of rotation of the feed roll. The additional magnets (30, 32) cooperate with magnets (18, 23) within the feed roll (10) to provide a more uniform flux density across the width of the feed roll, even in regions near ferrous side sheets (26, 28) defining the lateral limits of the harvester feed path. Tramp metal is thus detected with equal facility regardless of its trajectory past the feed roll (10). |
