| 摘要 |
A receiving pit has a grid covering an uppermost opening through which grain or other material is deposited into the pit. The grid including a series of generally parallel and spaced bars and a dust control device according to this invention includes a number of flights each adapted to be positioned beneath the grid. The dust control device includes a number of generally vertically extending bulkheads each adapted to be positioned beneath the grid and juxtaposed to a free end of one of the flights to thereby inhibit the escape of dust from the receiving pit. Each flight includes a series of blades capable of independently deflecting in response to an amount of material deposited through the grid and onto the blade. The dust control device also includes a release mechanism coupled to each of the flights to manually deflect at least selected blades and allow material remaining atop the blade to fall into the receiving pit.
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