Method and device for synchronously making material collide

Method for making a stream of granular material collide in a rotating system which is disposed horizontally and rotates about a vertical shaft (1), with the aid of a rotating impact member (14), comprising the steps of:

• feeding the said stream of material (S.sub.c) to the central feed (9) of a guide member (8), which rotates about the axis of rotation (O) of the said rotating system;
• guiding the said fed stream (S.sub.c) of material from the said central feed (9), along the guide face (10), to the delivery end (11) of the said guide member (8), which delivery end (11) is situated at a greater radial distance from the said axis of rotation (O) than the said central feed (9), in such a manner that the said guided stream of material comes off the said guide member (8) wish at least a radial velocity component (v.sub.r) and is guided in an essentially deterministic straight stream (R), when seen from a stationary viewpoint, and in an essentially deterministic spiral stream (S), when seen from a viewpoint which moves together with the said guide member (8);
• using the said rotating impact member (14) to hit the said material which is moving in the said essentially deterministic spiral stream (S) and has not yet collided, which rotating impact member (14) is provided with an impact face (15) and rotates in the same direction, at the same angular velocity (.OMEGA.) and about the same axis of rotation (O) as the said guide member (8), at a hit location (T) which is behind, when seen in the direction of rotation, the radial line on which is situated the location (W) where the said as yet uncollided stream of material leaves the said guide member (8), and at a greater radial distance from the said axis of rotation (O) than the location at which the said as yet uncollided stream of material leaves the said guide member (8), the position of which hit location (T) is determined by selecting the angle (.theta.) between the radial line on which is situated the location (W) where the said as yet uncollided stream of material leaves the said guide member (8) and the radial line on which is situated the location where the stream (S) of the said as yet uncollided material and the path (C) of the said impact face (15) intersect one another in such a manner that the arrival of the said as yet uncollided stream (S) of material at the location where the said stream (S) and the said path (C) intersect one another is synchronized with the arrival at the same location of the said impact face (15).