Crushing machine used, for example, to reduce wood remnants to fragments, has sieving holes of perforated sieving screen each with a large and a small axis

摘要

The sieving holes(50) of the crushing machine each have a large and small axis, hence having an oval shape. The larger axes of the sieving holes at least in one part of the perforated sieving screen(26) may be located perpendicular or parallel to the normal direction of movement(52) of the breaking tools. At least one section of the circumferential walls of the sieving holes, located downstream when viewed in the normal direction of movement of the breaking tools, is inclined to this normal direction of movement.