Patent ID: 8485364

Claim:
A vibratory separator for sizing of particulate material, the separator comprising: a vibratable housing, at least one sieve assembly, connected to said housing, at least indirectly, the sieve assembly is constructed to divide the material into fine particles and coarse particles according to a prescribed separation cut size, and a source of single frequency vibratory excitation for exciting the housing of the separator so as to separate particulate material provided thereto, wherein said at least one sieve assembly comprises, and a taut bottom sieve, the bottom sieve having a larger aperture opening size than said separation cut size; the bottom sieve comprising at least one beating inertial actuator; the beating inertial actuator having a specific location, size, shape and mass to provide optimal characteristics of a multifrequency excitation of the upper sieve and separation of the particulate material; at least one interface apparatus, connected to said upper sieve, the interface apparatus having a specific location, size, shape, and mass to provide an optimal distributed multifrequency vibration over the whole sieve area of said upper sieve; and wherein each said, at least one beating inertial actuator is arranged with regard to said at least one interface apparatus so that to generate prescribed repeated collisions therebetween and transmit vibratory-impact excitation to said at least one interface apparatus and to set, in non-linear fashion, the characteristics of the multifrequency excitation, transmitted therebetween, and operative to cause a corresponding multifrequency excitation and self-cleaning of said upper sieve and de-agglomeration of the material to be screened, when said sieve assembly is exposed to single frequency excitation from said source of single frequency vibratory excitation together with said vibratable housing, and wherein the forced frequency of said at least one source of single frequency vibratory excitation is close to one of the natural frequencies of said bottom sieve together with the elements connected thereto, so as to provide a resonant amplification of vibration of said bottom sieve.