SENSOR FOR CONTINUOUS MONITORING OF WIRE INSULATION Russian patent published in 2017 - IPC G01R31/12 

FIELD: test equipment.

SUBSTANCE: invention relates to electrical testing methods and can be used for quality control of wire insulation. Sensor is made in the form of two rollers with the diameter of 10÷14 mm from stainless steel having a U-shaped groove along the generatrix. Rollers are placed into a body in the form of a U-channel, between parallel walls of which there is a dielectric base for placement of the sensor elements. Sensor includes two metal rockers, two springs, two sliding contacts, two outputs for connection of the power supply, two guide bushings, n permanent magnets and an inductance coil wound on a magnetic core. Rockers are made in the form of metal plates, on one end of each of which there are rigidly fixed perpendicular to the plate plane cylindrical axes for bearings, on the other end of each rocker plate perpendicular to the rockers plane there are holes made for axes, which are rigidly fixed on the dielectric base for placement of the sensor elements – rotating rollers pressed by means of the springs to each other with the generatrices in the contact point lying on the vertical axis of the rollers. n permanent magnets are fixed radially and regularly on the side surface of one of the rollers. Each of the magnets extends beyond the roller diameter, and poles of extending parts of any two adjacent magnets are unlike. Magnetic core with the inductance coil wound on it is fixed on the dielectric base. On the rollers generatrices there are grooves located when the rollers are in contact opposite to each other and serving to lock and restrict the wire movement in the transverse direction. Into the central part of the rollers bearings are embedded set onto axes rigidly fixed on movable ends of the rockers. Fixed ends of the rockers are set onto axes fixed on the dielectric base. Rollers are pressed to each other with the generatrices by means of two springs, one end of which is fixed mechanically to one of the rockers, while two other ends of the springs are mechanically fixed to the dielectric base. Voltage to the working surfaces of the rollers is supplied by the sliding contacts in the form of elastic plate springs, one end of which is pressed to the rollers axes, the other end is electrically and mechanically connected with outputs for connection of the power supply source.

EFFECT: broader functional capabilities, higher resolution and monitoring informativity.

1 cl, 3 dwg