This paper describes the structure and working principle of seat seal in medium-speed pulverizer, analyzes the frequent replacement reason of seat seal when pulverizer is in use, solves the problems after finding reasons in order to meet the requirements of reducing the frequent replacement of seat seal.%介绍了中速磨煤机机座密封构造及工作原理，详细分析了造成磨煤机使用中存在机座密封更换次数频繁的原因，并逐一解决，以达到减少机座密封更换次数的工作要求。
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