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VSI Crusher Parts are wear parts for vertical shaft impact crushers. The VSI is a very versatile crusher, used to produce coarse and medium aggregates for asphalt and concrete, as well as fine sand. The feed size that a VSI can process is defined by the size of the rotor opening. In most cases, materials of five inches or less can be used. The largest VSIs can process feed measuring up to 12 inches. The VSI uses several parts subject to high wear. Rotors are configured with between three and six impellers, depending on their diameter. The larger the rotor diameter, the higher the number of impellers can be. The material to be crushed is introduced at the center of the open or closed rotor. The rotor rotates at high speed to project the feed forcefully into the crushing chamber. When the material hits the anvil assembly, it breaks into pieces.