... derrick support 井架底座 derrick telescoping 起升井架 derrick wheel 手轮 ...
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telescoping derrick 伸缩式井架 ; 伸缩式钻塔
telescoping shaped derrick 伸缩式井架
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The structure of the derrick is triple-section telescoping structure, substructure is parallelogram structure, can be lifted by hydraulic cylinder.
井架采用三节伸缩式结构，底座采用平行四边形结构，能用液缸整体起升。
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