Fat since hard sand of intermittent type mixed sand machine General will mixed sand room made sphere through is located in xià hemisphere special of high-speed mixing leaves, will sand to Eddy movement turned up, shàng hemisphere fixed leaves again will sand reflection down, such repeatedly cycle makes sand and hardener, and resin sand bond agent fast mix uniform, and has is located in sphere below of out sand mouth released type sand, according to each mixed sand volume and the bond agent stick degrees, and species of different, mixed sand time in 10~40s changes.