A pumping rod housing lock joint of a screw pump is primarily used to resolve the problem that the current screw pumping rod joint is easy to release.

一种螺杆泵抽油杆防脱扣接头主要解决现有螺杆泵抽油杆接头易脱扣问题。

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This invention is aimed to solve current screw extraction problem, and empolders structure-changed intramedullary nail to reduce suffering of patients in screw extraction.

本发明的目的为了解决现有的髓内钉断钉取出的问题，开发在结构上改变了的髓内钉，以减少断钉取出时给病人带来的痛苦。

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The theories established in this paper give directions to the current design and produce of the three screw pump; and also give solutions of the problems during usage.

本文的基础理论研究对当前的螺杆泵的设计生产都有很好的指导作用，对当前三螺杆泵使用中出现的问题有很好的解决效果。

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