The invention has the advantages of simple and reasonable structure, convenient production, convenient use and easy replacement, and can change the reciprocating stroke of the driving nut.

本发明结构简单、合理，方便生产，方便使用，易于更换，可以改变传动螺母的往复行程。

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When the concave upper nut is tightened, the effect produced is exactly the same as that produced by a hammer driving in a wedge.

当上螺母的凹面与之锁紧时，其效果与用一个锤子敲进一楔子的效果完全相同。

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Germany skilled, advanced manufacturing processes and technologies, focus on the large nut fastening bolt, disassembly of hydraulic technology and practical application of driving force.

以德国精湛、先进的制造工艺和技术为依托，专注于大型螺栓螺母紧固、拆装科技及液压实用动力的运用。

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