Design And Research On Anti-skid And Rope-clamping System For Friction Hoist

Multi-rope friction hoist depends on the friction between friction liner and wirerope to transmite the power, so it exists the possibility of sliding in the hoist running, it is easy to lead to serious accidents, and the installation location of the existing anti-skid device will affect the rope-clamping operation when changing and adjusting rope, for this problem, this paper designs a set of anti-skid and rope-clamping system for friction hoist, it can not only solve the problem of rope-sliding, but also has the function of rope-clamping.First, according to the functional requirements of anti-skid and rope-clamping system for friction hoist, the whole structure is analyzed, referring to the existing anti-skid device and self-lock mechanism of the rope-clamping device, designed the mechanical structure of rope-braking mechanism, and designed the key parts using finite element methods, having solved the problem of heavy dismounting work caused by lacking of installation space on the anticollision beam; designed the hydraulic loading system to achieve the target that brake force can be adjusted; designed the electric control system for the requirements of monitoring and controlling.Secondly, the telescopic control strategy of load cylinder and the detection scheme of cylinder telescopic state and wear state of friction liner are given;by studying the detection scheme of sliding distance and sliding speed, raised the detection scheme of photoelectric encoder fault; aiming at the deficiency of traditional PID control,used the fuzzy-PID control strategy with self-tuning parameter for anti-skid braking force; on the design of software, designed the overall architecture of the PLC300 program and distributed the function of each program, and designed the configuration interface based on Force Control.In addition, established the discrete multi degree of freedom dynamics model of tower type multi rope friction hoist system, by solving the dynamic model based on Newmark-β method, studied the judgment threshold of sliding distance and sliding speed; analyzed the braking effect by changing the applied time of anti-skid braking force; studyed the influence law of lifting height on sliding parameters.Finally, builded the AMESim model of anti-skid hydraulic loading system and Simulink model of control system, co-simulation results show that regulation performance of anti-skid braking force meets the requirements.