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柱片：柱片由经过全自动冲孔、冷弯轧制的立柱及横斜撑通过防松螺栓联结。
Frame: Frame including upright by the automatic-punching, rolling Bracing. That be connected through the pine-bolt connection.
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.
对10级BY型防松螺母当前运用中存在的个别螺栓折断和螺母松动问题进行了分析探讨，并提出了相应的措施与建议。
The breaking of very few bolts and loosening of nuts existing in the present operation of 10 Grade BY Type check nuts are analyzed and discussed.
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