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针对双伸缩液压缸存在内、外柱支撑力不相等的实际问题，设计出一种新型双伸缩液压缸，并介绍其设计、工作原理和特点。
Aimed at the practical problems of double retractable hydraulic cylinders with unequal inner and outer column supporting forces, a new double retractable hydraulic cylinder was designed and its design, working principle and characteristics were introduced.