| 摘要 |
A screening device suitable for cleaning railroad ballast which has become fouled with use, and of the type in which ballast to be cleaned is fed into a screen member to separate the coarse or ballast stone from the fines, the stone being reused to ballast the track. A screen member of generally frusto-conical shape, open at each end, is rotatably mounted on a track running frame, with the axis of the screen extending substantially parallel to the track and either horizontal or slightly inclined to the horizontal. The screen member is rotated so that centrifugal action results in the fouled ballast, loaded into the narrower open end of the screen member, moving up the walls thereof to its larger open end. The fines pass through the screen member and the stone is collected at a stone receiving member located adjacent the wide end of the screen member. A generaly frusto-conical fines receiving member of larger diameter than the screen member partially surrounds the screen member and receives the fines which fall therethrough. Conveying members are provided to convey the fines from the fines receiving member to a point of disposal, while the stones received by the stone receiving member are delivered back for re-distribution on the track. |
