| 摘要 |
A screen device is provided with a screen drum, which is arranged in a frame in an inclined manner and so as to be rotatable, and with a charging device. To prevent lump formation and the feeding of lumps of earth, the charging device has at its end a spreading conveyor. The spreading conveyor itself is charged intermittently or very slowly by a chain conveyor belt. To prevent the screen drum being blocked with fibrous material, a pressurised-gas jet pipe, in addition to a helical brush, may be directed onto the screen drum from the outside. The screen drum is driven by means of a screw helix which is in engagement with cam rollers arranged on a collar of the screen drum.
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