It is the indispensable main equipment for milling high-precision and low-ash flour in flour mills. It is used to purify and classify pure wheat residue and wheat core with more consistent particle size and better quality to improve the quality of flour. Vibration motor transmission structure, to achieve the ideal separation and screening effect, self-reciprocating cleaning brush, effective cleaning screen surface, rubber spring support, stable, vibration reduction, no lubrication maintenance, the total air volume is independently adjusted with each air chamber, controlling the air chamber, the characteristics of suction volume, feeding and grading system.