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在评价工程机械密封系统现状的基础上，对工程机械密封系统的旋转轴骨架油封和往复运动用密封装置的设计，用实例作了说明；还对液压挖掘机密封系统的最新进展作了介绍。
Based on the evaluation of the current status of construction machinery seal system, the design of seal design of rotary shaft skeleton oil seal and reciprocating motion of construction machinery seal system is illustrated with examples. The latest progress of hydraulic excavator seal system is also introduced.