Drainage scoop wheel

摘要

The invention relates to a drainage scoop wheel for recovering fine sand from the washing water of gravel washing installations. It is based on the object of reducing the quantity of clean water and waste water in gravel and sand processing and of at the same time improving the efficiency of the fine-sand recovery and the quality of the fine sand. According to the invention, this object is achieved in that channels (6) are arranged inside the scoop wheel tub (1), on the tub wall opposite the inlet (4) on both sides of the wheel (2), in that the channels (6) lead, at their upper end, via one or more passage opening(s) (17) in the tub wall, to one or more water collection reservoir(s) (8, 16) in such a manner that the same liquid level results in these water collection reservoirs (8, 16) as in the tub (1), the water collection reservoirs (8, 16) being connected to at least one suction pump (7) which pumps or pump the water flowing through the channels (6) out of the tub (1) as recycling water back into a gravel washing installation arranged upstream of the scoop wheel, and in that the channels (6) have intake openings (18) at their lower end, at a sufficient distance from the waste water layer (15). Seen from the intake openings (18), the channels (6) run obliquely upwards towards the side of the outlet (5).