The manual mechanical self-resetting unlocking structure can adjust the unlocking lever according to the actual needs within the design range, the unlocking handle is equipped with a metal soft zipper that can be unlocked even at the highest position, which is safe and reliable. Each wire rope is provided with an insurance mechanism to prevent the equipment from falling when the wire rope is broken. Yellow warning parts on the slope.at the same time of warning also protect the ground friction. The columns are made of high strength steel and are formed by cold drawing. each column has safety holes, which can be locked at any height within the design range. Optional bolt type iron upper plate or plug-in type aluminum alloy upper plate. Each equipment is equipped with four sets of fast-installed mobile pulley set at the bottom of the four columns. under the condition of no load, the equipment only needs two people to operate, so that the equipment can move freely on the flat ground.