控制单元设有预设的举升高度，左柱上安装有自动挡块。

Control unit with preset lifting height and automatic stop fitted at the left pillar.

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从工程学角度考虑，涡轮必须安装在垂直的柱上，即便在有坡度的地形也不例外。

For engineering reasons turbines must be mounted on vertical poles, regardless of the slope of the landscape.

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只有在每柱每相上安装过电压保护器才能得到好的保护效果。

Only in each column over-voltage protector installed on each phase can get good protection effect.

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