Stainless steel flap valveThe internal small material bin can store a certain amount of powder, playing a role of Liao Feng. The lower opening of the bin is controlled by a stainless steel flip plate with timed action by a cylinder. Timed and quantified, with a certain metrological function. Two sets connected in series for better effect, suitable for viscous materials or materials with low specific gravity, placed at the outlet position of the cyclone and dust collector at the bottom of the crushing system.