The crusher is typically fed via a pre-installed feed chute or a separate riddle grid. For smaller to medium-sized mold boxes, an unboxing grid can be mounted. Two stiffly coupled vibration motors move the helical crusher in a three-dimensional screw motion. This movement ensures intensive scrubbing friction within the sand-clod mixture, which allows for quick but gentle disintegration of clods to preserve sand grain integrity. Through a bottom grid, the sand passes from the crushing chamber to the external transport helix. A fine sieve integrated into this helix separates sand and oversized material. A discharge chute transfers the sand to the next processing unit. Oversized material can either be discharged into a waste container or returned to the crushing chamber for further processing. Larger metal and foreign objects remain in the crushing chamber and are automatically discharged through a manually opened flap at preset intervals.