Abstract: The invention relates to a rotor (139) for the acceleration of material, in particular a stream of granular or particulate material, with the aid of centrifugal force, with, in particular, the aim of causing the accelerated grains or particles to collide with an impact member at such a velocity that the particles are crushed. The invention provides ways to hinder that particles are pulled from the centre space though vortex pulling. The sliding member (143) is provided with a closed space that provides the rotor with a closed centre space. When the sliding member (143) are positioned some distance away from the metering member (141), a cover member (134) is positioned above the rotor (139) between the metering member and the sliding member. This enables to design the sliding members shorter and hence cheaper. It enables to place more sliding members on the rotor and hence increase continuous operation time accordingly.

Abstract: The invention relates to the field of the acceleration of material, in particular a stream of granular or particulate material, with the aid of centrifugal force, with, in particular, the aim of causing the accelerated grains or particles to collide with an impact member at such a velocity that they are crushed, and involves at least one sliding member (2) that is pivotly attached and centrifugally locked to the rotor (1) only along the side of the sliding member that is facing the rotor such that the attachment members (8,9) are located at a position essentially below the plane (22) with on it the outer edge (12) of the centre face (5). This has the advantage that the wear material is more effectively used such that less throw-away material remains, more sliding members can be placed on the rotor, a longer operation time is achieved, attachment members are not damaged when the sliding member wears through and that replacement is easier and special securing can be avoided.