Patent ID: 6702152
Filing Date: 2004-03-09
Classification: G01F,G01G

Abstract:
A device for dosing control of the mass flow for a helical dosing equipment with a supply container for bulk material, an electric motor, an extraction helix coupled to the electric motor, angle measuring means for determining the angular position of the extraction helix, a weighing machine which continuously measures the weight of the helical dosing equipment together with the bulk material contained in the helical dosing equipment, a mass flow controller connected to an output of the weighing machine and a rotational speed regulator (25) connected to the motor (6), characterized in thata modulation detector is present and is connected to the angle measuring means, with which the periodic deviations of a characteristic signal from a target value can be analysed quantitatively, a rotational speed modulator is present and is connected to the angle measuring means and the modulation detector, with which a suitable modulation signal can be generated from the quantitative values found by the modulation detector, a processing element is present and is connected to the rotational speed modulator and the mass flow controller, with which this modulation signal and the characteristic signal for the mass flow {dot over (m)}(t) can be processed into a modulated position signal, the rotational speed regulator is connected to an output of the processing element and with this modulated position signal can modulate the speed of revolution of the extraction helix according to the shape of the curve derived by the modulation detector.