A suitable material: limestone, river gravel, rocks, bluestone, pebbles, weathered sand, basalt, granite, quartz, diabase two application areas: building site, gravel plant, concrete hydropower dam site, metallurgy, building materials, utilities and other industries three washing operations, equipment advantages: 1, reasonable impeller design, with clean and high, reasonable structure, large capacity, low power consumption characteristics. 2, the entire transmission (including bearings) are materials with water and isolated by water, avoiding the bearing due to flooding, sand and pollutants cause damage. 3, using a screen made of wear-resistant materials, effectively extending the service life; and that in addition to the screen, almost no other wearing parts. 4, high-quality bearings, using the country's largest bearing manufacturers (ZWZ) or use SKF. Fourth, the working principle: When sand washing machine, motor through the belt, gear, rear wheel drive gear rotates slowly, gravel have to wash trough into the tank, roll driven impeller and grinding each other to remove covering the gravel surface impurities, while the destruction of vapor-coated sand layer, in order to facilitate dehydration; while adding water to form a strong current, timely small proportion of impurities and foreign matter away and wash tank overflow outlet from complete cleaning effect. Clean gravel away from the blade, and finally into the gravel from the rotation of the impeller discharge chute, complete cleaning effect gravel.