Start the shot blaster. A shot blaster according to an embodiment of the present invention includes a projector for projecting a shot ball onto a work object; A supply hopper for supplying a short ball to a projector; A collection tray for recovering the projected short ball; A transfer device for transferring the recovered short balls in the collection tray to the supply hopper; And a short ball sorting machine that injects air to the short balls falling from the supply hopper to sort good short balls, crushed short balls and foreign matters according to specific gravity, and supplies good short balls to the projector.
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