Apparatus and method for sifting, classifying, sifting, filtering or sorting fabrics

摘要

In a device for sieving, classifying, sifting, filtering or sorting dry solid materials or solid materials in liquids with, arranged in a sieving frame, a sieving surface and, assigned to this, an ultrasonic transducer (10), by means of which vibrations can be conducted to the sieving surface (18), the ultrasonic transducer (10) is assigned at least one resonator (14) which bears on the sieving surface (18) and is adapted to the resonance of the ultrasonic transducer and can be set in vibration, in particular bending vibration, by the latter. This resonator (14) - which in one embodiment is provided in the centre of the sieving surface (18) - is to be provided with resonance-transmitting elements (16) which project away from it on the sieving surface (18) in a finger-like manner and project away from it radially as bar resonators. IMAGE