Variety rules of concrete strain of outer shaft wall were carried out based on in-situ measurement during freeze sinking of Longgu Mine auxiliary shaft.

通过龙固副井冻结凿井期现场实测，获得了龙固副井外层井壁混凝土应变的变化规律。

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Design method and basic principle for ABB elevator master control program is analysed taking Fanshan phosphate Mine auxiliary shaft elevator as an example.

以矾山磷矿副井提升机为例，分析abb提升机主控程序的设计方法和基本原理。

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This paper introduces the work principle of four-quadrant operating high-pressure frequency converter, and its application in coal mine auxiliary shaft winch innovation system.

介绍了四象限运行高压变频器的工作原理，并应用到煤矿副井绞车改造系统。

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