Device for monitoring the distance between a first and a second magnetically conductive part which are movable relative to one another and forage harvesters with such a device

摘要

The distance between a first and a second magnetically conductive part, which are movable relative to one another, in particular between a knife (24) of a rotating cutting drum and a shear bar (12) of a harvesting machine, monitoring device with at least one permanent magnet (16) and an induction coil ( 18) for generating an electrical signal corresponding to the distance and field chopper with such a device. DOLLAR A Known distance sensors for monitoring the play between movable knives (24) and shear bar (12), which are based on the measurement of induced voltage pulses, use a permanent magnet (16) and an induction coil (18) placed around them, which in the shear bar ( 12) be sunk. As a result, the stability of the shear bar (12) is impaired and the induction coil (18) becomes a wearing part if the shear bar (12) is damaged. In addition, the signal processed in an evaluation circuit is provided with low-frequency components which impair the determination of the mutual distance between cutting elements and shear bar (12). DOLLAR A A device which monitors the distance between a first and a second part and which are movable relative to one another is proposed, which contains at least one permanent magnet (16) and at least one induction coil (18) which are spatially separated from one another or an evaluation circuit contains that at the ...