AKUSTISCHE DETEKTION VON STEINEN FÜR EIN SCHRÄGFÖRDERGEHÄUSE EINES MÄHDRESCHERS

摘要

The invention relates to a stone detection and ejection system (35) on the feeder house (21) of an agricultural combine (1) and an acoustic array (40) positioned beneath the front drum (22) and having an acoustic sensor (41) and sounding plate (42). The sounding plate is generally parallel to the feeder house floor (25a) and includes interruptions (38) configured upon its surface (36) to ensure that a stone (30) or other hard object, sliding over its surface, or a flow of crop material (31) carrying a stone, excites the plate (42) to a sufficient magnitude detectable by the acoustic sensor.