... 1.famous brand name 2.competitive price 3.Best service high frequency vibration device for sand making machinery (QT6-15)1. ... feeding, so that molding cycle is short, high production efficiency, quality, dense block large, high strength, dimensional precision.5. a multi-purpose ... 42blocks/mould 2 Block Shaping Cycle-12~18seconds 3 vibration frequency-50Hz 4 Total Weight-13T 5 excitation rate-120 KN ...