Shot blast machine impeller parts of the heart is composed of welded shell, top cover, impeller (with leaves divided into wheels and dual-impeller), Blade (straight blade and a curved blade) (impeller and impeller blades together and collectively referred to as body), impeller, directional, spindle, into pills and other major parts. Shot blasting machines, fixed on the spindle and impeller impeller rotation, orientation from directional fixed on the shield. Turn directional, you can change the direction of projectiles thrown, directional window size in terms of decided radial projectile scattering angle, usually around 60 °