SIEVE DEVICE FOR SEPARATING A MIXTURE OF PARTICULATE MATERIAL IN COMPONENTS OF DIFFERENT SIZES

Abstract A sieve device for separating a mixture of particulate material in components of different sizes, comprising a perforated sieve surface that rotates around a central, vertical shaft, said sieve surface having the shape of a hollow, truncated cone casing with a downwardly directed top, on which an imperforate distributor cone with an upwardly directed top has been amounted in the middle, of which distributor cone the basis connects to the sieve surface, whereas the supply of the mixture to be separated takes place via a central supply tube placed above the distributor cone, whereas the removal of the coarse component takes place near the circumference of the sieve surface. The novel device comprises at least one additional sieve surface, of which the diameter of the perforations differs from that of the former sieve surface, which additional sieve surface is displacable between a non operative position, in which it is removed from the former sieve surface and cannot receive mixture, and an operative position, in which it is placed on top of the former sieve surface and can receive the supply of mixture.