Abstract
A screw conveyer is extensively used as transportation equipment for granular materials. Until now, there have been several reports investigating the characteristics of the screw conveyer, the influence of the rotational speed of the screw shaft, the size and the shape of a screw blade and the filling ratio of granules on the transport efficiency of the screw conveyer. However, a study of the transport mechanism of granules has rarely been reported. The transportation mechanism of granular materials inside the screw conveyer is very complicated. In this paper, the transporting state of granules inside the screw conveyer is investigated using two parameters: i. e., the transport quantity and the leakage quantity in the stationary state. First the relationship between the transport quantity and the leakage quantity is examined by measuring them practically. Next, on the basis of the relationship, the difference equation expressing the transporting state is derived, and the transient transporting state of granules is investigated by computer simulation.
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