Murskain

The invention relates to a crusher comprising two adjacent crusher rotors (4, 5) with crusher teeth (6, 7) on their circumferences, counterblade structures (8, 9) locating on side walls (3) of the crusher frame (1) and cooperating with said crusher teeth, and screen sets (10, 11) beneath each crusher rotor so as to screen the material crushed to a given particle size out of the crusher. The first crusher rotor (4) is for coarse crushing and the second crusher rotor (5) is for fine crushing, and consequently they are provided with crusher teeth (6, 7) of different sizes, and correspondingly, different counter- blade structures (8, 9) are provided with counterblades of different sizes, mesh sizes in the screen sets (10, 11) beneath each crusher rotor being selected with the intention to produce a product in accordance with the requirement set for the final particle size.