Rod mill is a kind of widely used machine in sand making industry, whose performance has already achieved the international leading level and is the most effective and reliable crushing machine. It is not only used to crush such raw materials as feldspar, quartz but also used to make fine crushing and medium crushing in the production of abrasive, refractory material, cement, steel grit copper ore, iron ore and other hard or brittle materials. The rod mill is efficient, energy-saving and it is the most advanced sand making equipment in the world so far. The grinding media are appropriate number of steel bars and they will be raised to a certain height by centrifugal force and friction and then be thrown down. The materials will be fed into the machine and crushed by the moving grinding media and discharged to the next procedure.