For the detection of free fall, automatic separation of the detected magnetic (iron) and non-magnetic metallic impurities (copper, aluminum, stainless steel, lead, etc.) . Once detected metal impurities, remove the flap quickly metal and part of the material from the waste port discharge. For injection molding machine, a variety of extrusion machines and blow molding machines and other equipment protection; plastic raw materials modified granulation, abrasive, and so on detection. • A harvard-style fast cull system, compact and easy to install and use. • can be integrated into existing systems, with multiple calibers available. Special structural design can effectively avoid vibration. Quick removal system can reduce material loss,