通过对游梁式抽油机对接式连杆下接头连接螺栓的失效分析，指出了采用双螺母防松时，将薄型螺母放置在外侧是不恰当的。
Through the failure analysis of connecting bolt of down rod, it points out that it is not correct to put the thinner nut outer side if the double nut anti-loose method is adopted.
锁紧二连杆的调整机构和瞄准镜中部的二个光楔锁紧螺母（图1序号7）。
Lock adjusting mechanism of two connecting rods and two optical wedge lock nuts of sighting telescope center (No. 7 in Fig. 1).
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