A screening machine that uses electrically controlled transducers to vibrate a separating screen. The transducers can be piezoelectric patches, discrete piezoelectric components, or electromagnetic shakers. Further, the transducers can be coupled directly to the screen or through a vibration amplifier....http://www.google.es/patents/US20020117940?utm_source=gb-gplus-sharePatente US20020117940 - Smart screening machine
Número de solicitud: 09/792,778 Número de publicación: US 2002/0117940 A1 Fecha de presentación: 23 Feb 2001 Patente emitida: US6543620 ( Fecha de emisión 8 Abr 2003)
