Abstract: 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.

Abstract: The invention relates to a device for completely evacuating a silo containing finely divided material in bulk. A mobile box element passes over the floor of the silo, its face corresponding to the direction of advance being open and the horizontal base forming a shovel for collecting the material remaining on the floor of the silo. The bottom of the box element has a conveyor with transverse bars for pushing the pulverulent or granulous material located on the bottom of the box element towards an outlet trap located at one end of the box element and maintained level with a pit for evacuation by gravity; the box element is moved to sweep the surface of the silo. The invention is particularly applicable to the final evacuation of the silo containing granulous material such as cereals.