Times combined self-supporting crane. According to the inquiry of folk online. Com, Times United self-supporting crane system adopts C-shaped track and closed track design, with high strength and light weight, which reduces the wear of track trolley and winch wheels. In the case of insufficient lifting points, truss steel profile rail can be used to strengthen the bearing capacity of profile rail, so as to realize a larger span and reduce the number of hangers. The design of steel truss can make the lifting span reach 9 meters, which reduces the possibility of supporting columns interfering with the work site, thus making self-supporting cranes widely used in various industries.