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挖掘机工作装置销轴与轴套之间产生摩擦,需要加注润滑脂。为了防止润滑脂渗漏,避免沙土等污物进入销轴与轴套的缝隙污染润滑脂,造成销轴及轴套加速磨损,需在轴套外侧安装防尘圈。1.防尘圈结构及密封原理(1)结构防尘圈主要由密封圈、加强骨架、外壳等组成,如图1所示。密封圈设有密封唇,根据用途不同,分为单唇和多唇。密封圈材质为丁晴橡胶(NBR),加强骨架、外壳材质为08#冲压钢板。加强骨架可增加密封圈刚度,外壳可使防
The friction between the pin and shaft sleeve of the excavator working device requires grease. In order to prevent leakage of grease and sand and other contaminants from entering the gap between the pin shaft and bushing to contaminate the grease and cause accelerated wear of the pin shaft and bushing, a dust-proof ring must be installed outside the bush. 1. Dust-proof ring structure and sealing principle (1) The structure dust-proof ring is mainly composed of a sealing ring, a reinforced skeleton, and a shell, as shown in FIG. The sealing ring is provided with a sealing lip, which is divided into a single lip and multiple lips depending on the application. The material of the seal ring is NBR, and the reinforcement frame and shell material are 08# stamped steel plates. Strengthen the skeleton to increase the rigidity of the seal ring, the shell can prevent