| 摘要 |
The invention relates to the dry cleaning of grain and discloses a new process and an apparatus. In the new process a deep layer of grain is formed on an upper screen, the holes of which are larger than the grain particles, and a compacting effect is produced in the bottom zone of the layer by vibratory forces. Sand particles sink into the layer compacting near the screen, and this layer drops completely-i.e. together with the sand particles-directly on to a second screen situated therebeneath. The sand passes through the bottom screen. The double screen is preferably preceded by a coarse screen. The apparatus is modular and comprises as separate modules a screen box, a head section containing the grain inlet and a tail section containing the outlets. A number of screen boxes of different sizes and head and tail sections of different sizes and arrangements may be provided to make it possible to supply a number of screening systems of different sizes. In the most advantageous construction, the head section and the tail section have adjustable or replacable flow guides to enable the product to be guided in different ways to and from the screens.
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