METHOD OF DETECTING METAL PARTICLES IN MOVING FIBROUS MATERIAL Russian patent published in 2015 - IPC G01N27/00 D06H3/14 

FIELD: textiles, paper.

SUBSTANCE: invention relates to the field of engineering for light industry and can be used to create systems to detect metal particles in textile materials, in nonwoven substrate in production of synthetic leather, felt, etc. The method of detecting metal particles in the movable fibrous material consists in placing the movable fibrous material into the workspace of induced coil of the oscillating circuit in which using a generator the high-frequency oscillations are generated. Then, amplification and detection of high-frequency voltage at the output of the generator is carried out. And at the output of the amplifier-detector the impulse of the required duration is formed for safe operation of the actuator. From the conditions of the required sensitivity the amplitude of high-frequency voltage is set at the output of the generator, the voltage is converted at the output of the amplifier-detector and it is compared with the driving voltage. The obtained voltage difference is integrated and the voltage at the output of the integrator is used for stabilisation of the amplitude of high-frequency voltage at the output of the generator. And the process of integration is interrupted at the time of formation of the impulse for the time interval, the value of which is defined as a functional dependence on the linear velocity of the fibrous material, and the process of integration is renewed at the end of the pulse and the time interval of interruption of the integration process, and at the time of bringing the circuit into operation state the actuation of the actuator is blocked for the time interval, obviously longer than the duration of damped transitory processes in most inertial node of the circuit.

EFFECT: increase in reliability of detection of metal particles in the movable fibrous material and providing automatic compensation of external disturbing effects.

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