Rock Crusher - Jaw crusher. A rock crusher is a machine designed to take large rocks and reduce them to smaller rocks, gravel, or rock dust. Now there are a wide range of rock crusher on the China market, such as jaw crusher, cone crusher,impact crusher, Rock Crusher pdf JC400*600, 400*600, 350, 35-85, 15-80, 30-37, 10, 1920*1460*1840