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塔式起重机的小车变幅用钢丝绳受力后易被拉长而下垂 ,影响正常使用 ,因此需要有简单、高效、可靠的紧绳装置经常对其实施张紧。
Tower crane trolley luffing rope easily stretched and sagging, affecting normal use, so the need for simple, efficient and reliable tightener rope device often tightened.