Magnetic metal detection device of silage harvester and detection method thereof

The invention discloses a magnetic metal detection device of a silage harvester and a detection method thereof, and the device comprises a groove-shaped shielding housing disposed on a main shaft in afeeding roller, an opening at the top of the shielding housing, a signal processing board disposed in a groove body under the opening of the shielding housing, and a sensor coil with two terminals, and one terminal of the sensor coil is grounded. And the other terminal is electrically connected with the signal processing plate, and the signal processing plate is electrically connected with an emergency stop device of the feeding roller. The detection device disclosed by the invention can be used for detecting whether the crop feed contains magnetic metal or not, and outputting a threshold switch signal when the magnetic metal is detected, so that an internal cutter of the silage harvester is prevented from being damaged, and the safety is improved. Meanwhile, mixing of magnetic metal foreign matters into crop fee