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Ball mill is one of the main equipment of grinding material, yield per hour up to several tons to several hundred tons.In the work of grinding material requires a large amount of grinding body, under normal circumstances, the cylinder of Ball Mill grinded material for grinding body weight 14%, grinding body volume accounted for the effective volume of the 30%~50%, grinding body weight from several tons to several hundred tonnes. Ball mill cylinder body in rotation, grinding media and materials will always be in the one side of the cylinder is arc section, weighing up to dozens of tons, hundreds of tons of.The center of gravity of the axis always deviates from the axis of rotation.Cylinder in operation must take a grinding body and material as the eccentric rotation. Due to the large loading capacity of ball mill, Ball Mill Design shape is more massive, cylinder body, grinding body, material, liner, grate plate, bearing end cover several dozens or hundred tons.In order to ventilation and feeding is convenient, the hollow shaft neck diameter is large, with sliding bearing, open gear drive, friction resistance, low transmission efficiency, but also causes the working efficiency of the equipment is low. Ball mill cylinder speed must be lower than the critical speed, if more than the critical speed, from around tube ball layer begins, all media will gradually decentralization.In a supercritical speed, all media are centrifugal, along a concentric circle rotates, forming "epicyclic motion".When the tube body is like a big wheel, grinding power consumption is approximately equal to zero.Decide mill working speed is the starting point: to the outer grinding body has the biggest fall height, in this case, equipment can produce the maximum impact force of grinding material. Because the cylinder low speed impact material, less and less.To throw the ball movement medium ball in the barrel body, a circular locus motion and parabolic trajectory, is called a cycle.At the same time, the motion of the ball circulation numbers are slightly higher than the cylinder speed, that is to say in unit time of each ball impact times, only slightly higher than the speed of cylinder. impact stone crusher:http://www.hx-china.com/3.html cement machinery:http://www.hxjqchina.com/product-list_65.html