| 摘要 |
The present invention relates to a device for the control of dosing of a time dependent mass flow ~(t) for a helical dosing equipment (1) with a weighing machine (9) and a method of operation of such a device. The device includes modulation detector (31), with which the periodic deviation of the mass flow ~(t) from a target value can be analysed. The modulation detector (31) is connected to a speed modulator (32), with which the rotational speed f of the extraction helix (4) can be suitably phase shift modulated according to the curve shape derived by the modulation detector (31), whereby the deviations of the mass flow ~(t) are reduced to the unavoidable random deviations and the periodic deviation of the mass flow ~(t) can be eliminated. Both for the analysis of the mass flow ~(t) and also for the calculation of the modulation function analog or digital integrated electronic components can be applied. Individual or all of these calculations can however also be performed with the aid of a digital computer.
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