The ball mills are hollow drum closed with loading and unloading end caps, filled with grinding media and rotated around its axis. The drum of the ball mill is a hollow cylinder of steel, lined inside with armor lining plates which protect it from impact and friction effects of the balls and the grinding material. The shape of drum liners has a significant impact on mill’s work. Drum Liners of ball mills operated on a large source material have ribs. For mills operated on the fine materials use lining with small ribs or quite smooth. Height, mutual arrangement and shape of the ribs define force of adhesion the grinding media with the drum and the results of the mill’s work. It is important when the character of the lining surface did not change harshly during its deterioration.
The ball mill head (end cover,end cap) is the general name of the cylinder end cover and the trunnion. It bears the rotation load of the whole mill and the grinding body. It runs continuously under the action of alternating stress. It is also the weakest link of the ball mill, and the most difficult to control the manufacturing quality.
