Size reduction device and method for the size reduction of solid particles

A size reduction device for solid particles conveyed as a suspension in a liquid flow through the size reduction device, the size reduction device comprising:

• a housing which is at least partially open at opposite sides for the purpose of introducing and discharging the suspension in a flow direction;
• at least two counter-rotatable size reduction components disposed in the housing, wherein each size reduction component comprises a plurality of cutting elements, which are each disposed on a common rotatable shaft, wherein each shaft has a longitudinal axis, wherein the flow direction of the suspension is at right angles to the longitudinal axes of the shafts of the size reduction means;
• two mutually opposite guide rails with in each case a longitudinal axis parallel to the longitudinal axes of the shafts of the size reduction means are assigned to the size reduction means, wherein each guide rail comprises a base plate, on which ribs with channels lying in between are constituted parallel to the flow direction on a side of said base plate that points towards the size reduction means, wherein the liquid flow and the solid particles entrained therein having a maximum size predetermined by the width of the channel can be conveyed through the channels, and wherein the ribs each cover only a partial region of a width of the guide rails parallel to the flow direction.