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This screw conveyor has a tubular shape and is used for volumetric dosing and horizontal, vertical or inclined transports. It is used for the transport of powders and fine-to-medium grain products that are not easily broken and slightly abrasive. Inside there is a spiral welded on a shaft with a diameter proportioned to the production, supported by adjustable ball bearings fixed to the outer part of sheet metal casing and by a gear motor; it is equipped with an anti-obstruction sensor; it can be supplied with opening bottoms for cleaning.