vsi sand making machine is a newly researched equipment, with international advanced level. technology and modern processing equipment make it a leading role in this industry. usage: vsi sand making machine is widely used for artificial sand, in metal and non-metal ores, cement, refractory material, bauxite, silicon carbide, glass material, building material. working principle: (1) center feeding: raw material falls down into feed hopper, then enter into impellor through central entrance hole. it is accelarated in high-speed impellor, then is thrown out at speed of 60-75m/s. when it hits impact plate, it is crushed. final products come downwards though outlet. (2) ring feeding: raw material falls down into feed hopper, then through ring, it is divided into two divisions by material-deviding plate. one enters into impellor through the center of material-deviding plate. the other falls down from outside of material-deviding plate. material, which is thrown out by impellor at speed of 60-75m/s, hits material coming down from outside of material-deviding plate. in this way, material is crushed.