| 摘要 |
1. A dust feeder. It is characterised in that it consists of a vertically-positioned hermetic dust container (1), inside the container (1), there is a stirrer (4), preferably rotating near the container wall. At the bottom (8) of the container (1), there is a dust-proportioning assembly (5), consisting of a rotating disk (6) with a dumping slit (2) and a profiled scraper (9), connected to the bottom surface of the disk (6). The dumping slit (2) in the disk (6) reaches toward the main axis (7) until a point, which ensures that the angle (α) - in the main axis (7) plane - between the bottom (8) of the proportioning assembly (5) and the line connecting the internal edge of the slit (2) to the closer edge of the dumping opening (3) is not larger than the natural dumping angle of the dust in question. In front of the shifting edge of the slit (2) in the disk (6), there is a little rod (10), fixed to the main axle (7). The little rod (10) should preferably be an extension of the stirrer (4) and nearly reaches the bottom (8) of the proportioning assembly (5). The disk (6), the scraper (9), the little rod (10) and the stirrer (4) are fixed to a thin and rigid main axle (7), secured to the axle of a small driving motor (11). The air-feeding inlet stub pipe (12) is located in the bottom part of the duct (13), inside which the main axle (7) rotates. The outlet stub pipe (16) is located in the top part of the duct (11), located below the proportioning assembly (5).
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