A crusher is a machine designed to reduce large rocks into smaller rocks, gravel, or rock dust.The earliest crushers were hand-held stones, where the weight of the stone provided a boost to muscle . Crusher bucket in a quarry . The electric motor of the cone crusher drives the eccentric shaft to make periodic swing

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With impact crushing, the stone breaks along its natural cleavage . jaw and impact crushers may feature a diesel and electric-drive option.

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