Pin shaft connecting mechanism at root of movable arm of excavator and excavator

The utility model discloses a pin shaft connecting mechanism at the root of a movable arm of an excavator and the excavator. The pin shaft connecting mechanism comprises the movable arm, a rotary table, a cover plate, a pin shaft and a check ring, the movable arm is connected with the rotary table through a pin shaft; a step is machined at one end of the pin shaft, the check ring is installed between the step of the pin shaft and the rotary table, the two ends of the pin shaft are each provided with one cover plate, and the cover plates are fixed to the rotary table through fasteners. The check ring prevents the pin shaft from moving towards the outer side to impact the cover plate, and the service life of the cover plate is effectively prolonged. 本实用新型公开了一种挖掘机动臂根部的销轴连接机构及挖掘机，包括动臂、转台、盖板、销轴和挡圈；所述动臂和转台通过销轴连接；所述销轴一端加工有台阶，挡圈安装在销轴的台阶与转台之间，销轴两端各安装一个盖板，且该盖板通过紧固件固定在转台上。本实用新型的挡圈防止销轴向外侧窜动撞击盖板，有效提高了盖板的使用寿命。