This paper analyzed the invalidation form of floating oil-sealing used in cutting head of S100A-type roadheader and then established the measure to heighten reliability of oil-seal.

• 针对S100A型掘进机切割头浮动油封失效形式进行原因分析,提出了提高油封可靠性措施,该方法对于煤矿采煤机、刮板输送机中结构密封同样具有借鉴意义。