Chang'an University, Xi'an 710064, China)

Abstract: Aiming at solving some problems in the separation of wire rope from the overspeed governor wheel, such as unstable clamping, easy to damage rope and difficult to lift, through the analysis of the structure of elevator overspeed governor and the force of wire rope, a method of rope separation based on force increasing mechanism was proposed. Firstly, a rope-lifting device composed of positioning clamp, rope-lifting clamp, supporting shaft, bearing and one-way lock was designed and manufactured. The device adopted the positioning clamp and rope-lifting clamp made of the spiral force-increasing principle of the bench vice to realize the clamping fixation of the wire rope. The rope-lifting clamp, supporting shaft and bearing made of the force-increasing principle of the lever were used to lift the wire rope, and the one-way lock based on the ratchet mechanism was used to realize the positioning of the lifted wire rope. Then, the friction coefficient between the wire rope and the rope clamp was determined by uniaxial tensile test, and the ability of the rope lifting device to clamp and lift the wire rope was determined by performance test. Finally, the rope separation method was optimized for the flexible deformation characteristics of the wire rope through field tests. The research results show that when the elevator is stationary, the designed rope lifting device can clamp and lift the wire rope out of the position required to meet the overspeed governor test with only a small force applied by a single person, and the whole rope lifting time is not more than 1 min.
Key words: elevator overspeed governor; force increasing mechanism; rope separation method; rope lifting pliers; frictional coefficient; one-way lock