DEVICE RECOGNIZING FERROMAGNETIC FOREIGN BODIES, SPECIFICALLY, PROTECTING WORKING TOOLS OF HARVESTERS Russian patent published in 2003 - IPC

FIELD: protection of working tools of harvesters and diggers against entry of ferromagnetic bodies. SUBSTANCE: technical result consists in rise of sensitivity over layer of flow of technological product with preset dimensions of magnetic system with simultaneous achievement of uniform sensitivity over entire width of product. Magnetic poles of like polarity are positioned along entire width of flow of technological product in center of roller and are embraced by measurement coils sensing disturbance of magnetic field of permanent magnets by ferromagnetic bodies moving with reference to permanent magnets. Permanent magnets are magnetized at angle of 45-90 degrees relative to plane of separation of their polarity and measurement coils are so positioned that their plane is located in plane of separation of polarity of magnets. EFFECT: raised sensitivity of device. 4 cl, 8 dwg