The collision and friction of the castings are used to separate the castings and the sand mold, and at the same time achieve the function of cooling the sand temperature.

When the mold of the sand box is rotated to a certain height, it falls to the bottom of the simplified box by its own weight. Under the mutual impact and friction, the sand mold and the casting separation well reach the simplified box grid along the direction of the spiral plates. The sand enters the old sand system and the casting is discharged through the discharge port.