The Study On Longitudinal Vibration Rule And Restraining Method Of Wire Rope In Ultra-deep Mine Hoisting System Test Bed

The study on the rule of longitudinal vibration and the method of restraining longitudinal vibration of wire rope in double rope winding hoisting system test bed is an indispensable foundation for the development,design and manufacture of mine hoisting equipment.It can determine the rule of longitudinal vibration in the operation of mine hoisting wire rope and finds out an influential factor on longitudinal vibration.In the premise of safety requirement,the research can promote the reduction of host weight,the bearing and the cost.This paper establishes the force model of the mine hoisting system and the wire rope kinematic equation.The theoretical analysis is used to determine the type of longitudinal vibration of wire rope of the hoisting system test bed.The corresponding dynamic simulation model is established by Matlab software based on a selected differential equation.According to the similarity theory,the design parameters of the test bed are obtained.Aiming at the object and purpose of the project,a detailed experimental scheme was designed by using the control variable method.Selected a series of numerical values according to certain changeless step length,a large number of simulation experiments are conducted based on different conditions of the test bed and the prototype as well as different factors affecting the longitudinal vibration,such as acceleration,elastic modulus,rope end load,and speed,etc.By analyzing and assembling the experimental data and results,form charts and fitted curves are generated,and the influence rules and trends of each factor on the dynamic tension and deformation of steel wire ropes are obtained.The theoretical basis for the prediction of the dynamic load of the system is improved.At the same time,the accurate calculation and prediction of the maximum tension and the maximum deformation in the rope vibration can provide theoretical support for the lightweight design of the hoist.Based on the method of suppressing the longitudinal vibration of the wire rope through the hoisting system test bed,using the way of trapezoidal acceleration,it arrives at a conclusion that the overall tension and deformation are obviously decreased,which effectively suppressed the sudden change of tension and deformation at each transition stage.Meanwhile,declining of the longitudinal vibration also improves the stability of the lifting process.Due to a smaller liftingheight of the hoisting system test bed,it is not obvious to test the effect of the longitudinal vibration suppression.In order to better study the suppression effect of the curve speed model on the longitudinal vibration of the steel wire rope,this paper carries out dynamics simulation experiment to analyze and compare the dynamic tension and deformation of the steel wire rope under the traditional trapezoidal velocity model and the curve velocity model.The prototype parameters in the experiment are taken from the National 973 Project led by CITIC Heavy Industry.The name of the project is Basic Research on Design,Manufacture and Safe Operation of Large-scale Lifting Equipment for Ultra-deep Wells.The experimental results show that under the curve speed model,the maximum tension and maximum deformation of the wire rope are apparently reduced,and the longitudinal amplitude of the tension and deformation of the wire rope is also obviously decreased.It proves that applying the curve speed model can effectively suppress the longitudinal vibration.