Screw Sand Washing Machine: 1, Simple structure 2, Big capacity 3,suitable for different work conditions 4, convenie Screw Sand Washing Machine Working Principle:The electric motor runs slowly with the impellor after decelerated by the belt, decelerator and gears wheel. The sand and stone flow into washing launder from feeding launder, rolls with the impellor, and grinds each other. The impurity ...