An impact detacher with a centrifugal wheel and two or more centrifugal conduits which are enclosed by two or more impact rings, wherein the material to be ground is fed concentrically via a feed pipe and guided away again via an outer annular conduit. Each half of the impact ring is directed to two oppositely directed impact surfaces, wherein the impact detacher can comprise a common product discharge conduit. The centrifugal wheel comprises a guiding apparatus with a divided feed in the area of the product inlet, wherein a larger feed surface is assigned to the centrifugal conduit remote of the feed pipe.