Mechanism Of The Multi-Layer Winding Drum And The Theory On Crossover Design In Deep Mine Hoisting

The winding lifter achieve deep mine hoist via the wire rope multi-layer winding,and the wire rope experience circle transition and layer transition inevitably.The smooth and steady when circle transition,the layout of the two crossover zone,and the structure of the rising and filler rings directly related to the lifetime,vibration,orderly rope arrangement and engineering safety.Aiming at these problems,Supported by the National Key Basic Research Program of China(973)(No.2014CB049403),the present thesis gives a study on the grooves and the riser and filler rings,implement theory and experimental research on reasonable crossover zone length,proper layout of two crossover zone and ideal riser and filler rings.Hoping to offord reliable theoretical support to designing deep mine hoisting machine.The main results of the thesisare as follows:(1)The parallel groove is determined to be the groove type for multi-layer winding.This thesis starts from the course of crossover of winding cable,use the methods of differential geometry,mechanics,and mathematical analysis,study the movements of the crossover,and derive the important formula that can reduce the vibration of cable during the course of crossover: the formula about central angle of the crossover arc.The results display that four factors contribute to central angle of the crossover arc,that is,the gap of the rope grooves,friction coefficient of the cable,and diameter of the drum and the cable.When the drum and cable diameter are confirmed,the gap is larger,the crossover length is longer;When the gap is confirmed,the friction coefficient of the cable is bigger,the crossover length is shorter;When the gap and the friction coefficient of the cable are confirmed,the rope ratio is larger,the crossover length is shorter.(2)The vibration equation of the hoisting system with boundary excitation are built and solved,obtain that the confirmation of the grooves type are determined by the hoisting system parameters.In this subject prototype parameter,the maxmum of the lateral vibration of catenary are changed with the asymmetric coefficient like “U”,when the two crossover layout asymmetric,and the asymmetric coefficient ? =0.8,the lateral vibration of catenary are minmun,and the amplitude was no mutation,and all these are good to orderly multi-layer winding.(3)A new riser and filler rings are designed,the surface of the device are changed to concave shape face,and the cable is always ssurface contact when layer changing,and the local pressure on the device is reduced,and the abrasion of the cable is reduced too;The gap between gap and flange is filled,and the cable is always supported,and rope locking is reduced.The computational formulas of the riser and filler rings are derived.Calculation shows,the accelerated speed of the cable winding on the device this paped designed is smaller than that of Lebus.(4)Combine the “Multi-rope winding hoieting experiment platform” this project designed,design related experiment and process four different grooves and riser and filler rings,and present a test method for the cable's vibration,and test the lateral vibration of the catenary when the testbed install the four type grooves,and different data processing method are adoped to the experimental data,the theory of the grooves and the riser and filler rings this paper studied are correct.The result display: the vibration model with boundery excitation are valid;whether symmetry groove orasymmetry groove,the vibration in-plane of the catenary is smaller than Lebus device;the asymmetrical grooves which CQU design is the best grooves.(5)On the basis of the vibration model this paper build,Simulation and study the influence on the lateral vibration of catenary with lifting speed,lifting load,obtain that the lateral vibration of catenary are changed with lifting speed,and like inverted “U”,and the lateral vibration of catenary are minmum when the lifting speed is 19m/s;the transverse vibration response is biggest when no-load,a monotone decreasing trend is appear with the increase of the lift load,and the lateral vibration of catenary are minmum when half-full load,later with the increase of the load,the maxmum of the transverse vibration responseappear slight fluctuation.