国内使用和生产塔式起重机已有相当长的历史,但塔机外供电电缆的收放一直没有很好地解决,这是当前塔机生产和使用中急待解决的课题之一。以往电缆的收放多采用重锤式、同步卷筒等型式,但它们都存在着这样或那样的缺点,不受用户欢迎。不少塔机,尤其是大量生产广泛使用的民用建筑的小型塔机大多没有电缆收放装置,电缆在塔 The domestic use and production of tower cranes have a long history, but the retraction of the tower outside the power supply cable has not been well resolved, which is currently one of the urgent issues to be solved in the production and use of tower cranes. Cable used in the past, the use of heavy hammer type, synchronous drum and other types, but they all have one or the other shortcomings, not user-friendly. Many tower cranes, especially the small tower cranes, which mass-produce widely used civilian buildings, do not have cable retractable devices. Cables are on the tower