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.

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。

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One end of a connecting rod on both sides of the screw nut is connected with the pin of a sliding chassis, and the other end is hinged with the screw nut.

螺母两侧的连接杆一端与滑动机架上的销轴连接，另一端与螺母铰链。

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