... its vertical motor, which is installed eccentric hammers on the top and bottom, is regarded as a vibratory source. The eccentric ... the sieving surface. Adjusting the phase angle on the top and bottom can change trajectories of the materials on the ... pigment, medicine, grease, paint, palette, etc.2) Abrasive material and ceramic industry: building sand, mica, alumina, abrasive, refractory material, ...