Simply speaking, the operation principle of vertical shaft impact crusher is “stone strikes stone”, that is, materials enter the impeller cavity, which is turning at high speed, at the top. With centrifugal force, the materials will impact other materials that fall around the impeller. Then, after interact striking, materials will impact on material layer between the impeller and scale board for many times and will be rubbed and crushed. Then they will be discharged at the bottom. Specifications of sand maker.