Research On Anti-skid Safety Of Vertical Shaft Multi-rope Friction Hoisting System Based On Dynamics

With the development of mine toward large-scale,high-efficiency and high-speed,the hoisting height,running speed and one-time hoisting load of mine hoisting system are increasing constantly.The skidding problem of the hoisting wire rope is more and more prominent in the mine hoisting,which seriously affects the safety of coal production.In order to improve the anti-skid safety performance of the vertical shaft multi-rope friction hoisting system,the anti-skid safety of the hoisting system in emergency braking,starting acceleration control mode,hoisting system parameters and other aspects was studied in-depth from the perspective of elastomer dynamics,which provided some reference for the design and improvement of the hoisting system.On the basis of transmission principle of the vertical shaft multi-rope friction hoisting system,the dynamics model of rigid body and elastomer of hoisting system are established by assuming the hoisting wire rope as rigid body and elastomer respectively.And combined with the specific parameters of hoisting system,the dynamics models are solved respectively under three different working conditions of hoisting heavy load no-load operation and lowering heavy load,and the vibration characteristics of hoisting wire rope under the two dynamics models were obtained and analyzed.Through the analysis and comparison of the two dynamics models,it is concluded that it is more scientific and reasonable to check the anti-skid safety of hoisting system by elastomer dynamics model.The sliding reasons of emergency braking of hoisting system under different working conditions are analyzed,and the anti-skid safety of emergency braking of hoisting system is checked.The simulation results show that the hoisting system not only satisfies the requirements of deceleration but also satisfies the requirements of anti-skid safety under emergency braking.And the selection of the magnitude of the emergency braking force was studied;the relationship between the braking force and the braking distance and the anti-skid safety was analyzed,and the reasonable value of braking force was determined.The hoisting system under different starting acceleration control curves is simulated,analysis and comparison of the force of the wire rope and the anti-skid safety performance of the hoisting system.The results show that the trapezoidal acceleration control curve of the hoisting system with the first acceleration time₁t between 0.7s and 1.2s is obviously superior to other four forms of starting acceleration control curves such as rectangle,and the optimal starting acceleration control curve is determined.The control variable method is used to discuss the influence of the hoisting system parameters on the anti-skid safety from three aspects:hoisting wire rope,kinematics parameters and hoisting container load.It is obtained that the elastic modulus and maximum hoisting speed of the wire rope have no obvious influence on the anti-skid safety of the hoisting system,the three parameters of unit mass of wire rope,hoisting acceleration and load of hoisting container have an important influence on the anti-skid safety of the hoisting system.The orthogonal test design method is used to clarify the importance of each parameter on the anti-skid safety of the hoisting system is the unit mass of wire rope,the load of hoisting container and the hoisting acceleration.Figure[67]Table[9]Reference[65]...