| 摘要 |
The dust collection units in a rotary railroad car dumper installation are mounted over the hopper pit along each side of the cylindrical, rotatable dumper frame so that dust ladened air can be sucked directly into the dust collection units without the need for duct work and the collected dust can be returned directly to the pit without the need for easily clogged screw conveyors and small chutes. The dust collection units also form with air shields mounted on the cylindrical dumper frame, a rotary valve which restricts flow such that ambient air is sucked into the hopper pit by the dust collection units at velocities which exceed the capture velocity of the dust clouds created by dumping of the contents of the car. The air shields include orthogonal pairs of planar members mounted on the rotary frame. One planar member extends outward from the top of one side of the car to be dumped such that the side of the car forms part of the air shield and the gap under the car forms, just as the car contents are being dumped, a longitudinal slot through which ambient air is sucked to sweep away the resultant billowing dust cloud. |
