| 摘要 |
PURPOSE:To prevent production of granular dust and to enable a device to be mounted in a granular material processing device, by a method wherein a number of electromagnetic force generating coils, connected in series to a core disposed along a conveyance passage for a granular material covered with powder of a magnetic material to control excitation. CONSTITUTION:By controlling excitation of a magnetims generating coil 13, coiled around a core 10, by means of a control device, namely feeding an alternating current of a desired voltage level to each magnetic force generating coil 13 through a voltage regulator 3 in a control device, a magnetic force, the intensity of which is always changed, is generated in the core 10. As a result, when a granular material, the surface of which is covered with powder of a magnetic material, e.g., iron, nickel, cobalt, or their alloy, is fed from the one end of a granular material conveyance passage 11, disposed adjacent to the core 10, through, for example, a feed hopper 12 and the like, the granular material can be conveyed from the one end toward the other end along the conveyance passage 11 by dint of a magnetic force. In this case, control of a voltage regulator 3 of a control device enables easy regulation of the conveyance speed of the granular material, i.e., a conveyance amount, and this constitution enables prevention of production of granular dust and a device to be mounted in a granular processing device.
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