A material-handling blower is associated with a conveyor duct, which has an open lower end. A horizontal conveyor screw has an inner end associated with the lower end of said duct and is angularly movable about a main vertical axis extending near said inner end. At least two backing rollers are rotatable on vertical axes and connected to said conveyor screw to move in unison therewith about said main vertical axis and are engageable with the inside peripheral surface of a silo to back said conveyor screw.
Horizontal carrying arms are connected to said conveyor screw to move in unison therewith about said main vertical axis and extend from said conveyor screw on opposite sides thereof substantially at right angles to the axis of said screw. Supporting rollers are carried by and pivotally connected to said carrying arms and individually adjustable in height relative to said carrying arms and are disposed on opposite sides of said duct at different radial distances from said main vertical axis and rotatable on horizontal axes which are substantially at right angles to the axis of said conveyor screw. At least one propelling roller is provided, which is connected to said conveyor screw and rotatable on a horizontal axis to move said conveyor screw about said main vertical axis. A throwing blade is detachably and non-rotatably connected to said conveyor screw.
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