The process of liner wear and the changing characteristics of the ability of crushing and grinding in the coal pulverizer are analyzed, a new type of cylinder liner is developed, which has a multi-step wave crest. The small balls on the liner are stuck by the steps, in this way, the wear of the liner wave crest is lightened, so it can keep a long-term stability, it also can take the balls to a reasonable height, increase the number of the balls which are taken by the wave crest and make the dropping points scattered, as result of that, it substantially increased the coal pulverizer's crushing and grinding efficiency; Also the wave crest of the liner can be dismantled from the base plate and individually replaced, so it made a great reduce in the material consumption of liner. The test shows that, with appropriate use of the balls, the liner can reduce the ball charge by 35-50%, reduce power consumption by 30-40%, it also can keep the coal pulverizer's output and improve milling fineness.
