GEAR DETECTING FLAWS IN EXTENDED ARTICLES Russian patent published in 1997 - IPC

FIELD: test of pipes by method of eddy currents in lines of mills and generation of signal from lateral seams with ensuring usage of it for automatization of mill. SUBSTANCE: gear gas A.C. voltage generator 1 and eddy current converter 2, first channel 3 of signal processing and second channel 4 of signal processing, inverter 5, logic unit composed of two coincidence systems 6,7 and output device 8. Input of inverter 5 is connected to output of second channel 4 of signal processing and output - to input of first channel 3 of signal processing. Output of first channel 3 of signal processing is connected to first inputs of two coincidence systems 6, 7 of logic unit and output of channel 4 is linked to second input of second coincidence system of logic unit. Eddy current converter is made of four resistively coupled three-winding segment pickups each carrying inductor winding 9 and measurement windings 10, 11 of first and second signal processing channels. Inductor winding and measurement windings of first channel are connected in opposition, and measurement windings of second channel are connected in aiding. EFFECT: enhanced operational efficiency and reliability of gear. 4 dwg