| 摘要 |
An extraction device for silos with a circular floor having an opening in the form of a central funnel is disclosed. An endless screw having one end positioned centrally with respect to the opening in the silo floor is adapted to sweep angularly over the floor, bringing the product contained in the silo towards the central funnel for evacuation of the product onto a conveyor positioned beneath the floor of the silo. A cross-piece extends across the central funnel opening, providing a rigid mount for a central support. A protective cover, generally conical in form, is fixed to the central support. The protective cover overlaps the central opening and covers a first motor adapted to drive the screw about its axis. A fixed ring is connected to the protective cover. A rotating ring is mounted for rotation to the fixed ring along a circular bearing surface. The rotating ring supports the endless screw and its motor. A second motor is provided to drive the rotating ring with respect to the fixed ring for producing the angular sweeping movement of the screw across the silo floor. |
