| 摘要 |
<p>The grinding mill includes a chamber having a rolling track and a base beneath the track. A plate within the base carries a roller engaging the track, and reduction gearing secured to the base rotate the plate. The output shaft of the gear is connected directly to the plate. An air duct carries compressed air to a passage defined by an annular shoulder depending from the plate. An opening in the base admits air required for grinding.</p> |
