Contact Characteristics And Slippage Behavior Between Wire Rope And Drum Groove For Best Fixation Model In Ultra-deep Mine Hoist

Mineral resources are the main energy sources in our country.With the development of the national economy,more and more shallow coal mines have been consumed,which gradually makes our country to exploit the deep mineral resources.Mine hoister as an effective transport equipment for mineral resources,it not only requires favorable hoisting and operation capacity,but also ensures adequate safety and reliability.At present,the design and manufacturing technology of single-rope winding hoist and multi-rope friction hoist used in shallow shafts?within 1000 m?is mature in our country.But for the lifting of ultra-deep mine?more than 1500 m?,if taking the traditional lifting equipment,the diameter of rope and drum for the single-rope winding hoist will be huge,and the alternating stress amplitude of wire rope for the friction hoist will be too large,thus all of them are not suitable for ultra-deep lifting.Researches show that the multi-rope winding hoist is the most effective hoisting equipment to satisfy the requirement of heavy-load?240 t?,high-speed?18 m/s?,efficiency and safety for ultra-deep mine.In this paper,aiming at the problem of the multi-rope winding hoist encountered for ultra-deep lifting,in order to form the restraint technology for discordance and the theories for safety and reliability,exploring the effect on spindle as the fixation of wire rope under a variety of working conditions,and the best fixation mode for wire rope is proposed.Considering the time-varying tension of the wire rope in the lifting cycle,the contact pressure distribution and internal stress distribution characteristics of the wire rope and the groove are analyzed,and the relative slip between wire rope and groove under different friction coefficients,with pitch and without pitch,are researched.The main research of this paper includes:?1?Aiming at the problem that rope's fixation mode has an effect on the bearing capacity of spindle,comprehensive research methods of mechanics model establishing,numerical simulation and finite element analysis have been used to derive the general formula of the variable load of the spindle,program 16 kinds of working conditions and carry on simulation analysis,and then the best fixation mode of wire rope is proposed by comparison,results show that the best fixation mode is lower left fixation for mobile drum's double-rope area and upper right fixation for fixed drum's double-rope area when the web is symmetrical or asymmetrical(difference of L₈?L₁₀ within 150 mm).?2?Aiming at the changes of tension reduction,tension and radial force of the wire rope during the lifting cycle,the mechanics model of the wire rope and the drum during multi-layer winding is established,and the calculating formulas of the tension for one-layer winding and multi-layer winding are deduced.All the influences of the deformation of the drum,the deformation of the wire rope and the web support are taken into account to solve the variation of the tension for the wire rope.The results show that the acceleration and deceleration have a great influence on the tension,and the difference of the tension for same rope at the left and right rope area continuously increases owing to the distance from it to left web and right web are different.?3?For the conformal surfaces frictionless contact between the wire rope and the parallel polygonal line groove,the contact model of wire rope and groove in straight line area and polygonal line area are established and the contact pressure distribution,the contact semi-angle,the stress field and the closed form numerical solutions are given.Results show that the contact semi-angle between wire rope and groove is only affected by the radial force of wire rope,and fatigue damage easily occurs at the contact boundary between the rope and the groove because of local stress concentration.?4?For the fretting slippage between wire rope and drum groove caused by the variation of tension for operation,the slip model of rope and groove with pitch and without pitch is established,the analytic expressions of slip radian,slip distance and frictional work are given and the closed-type numerical solutions are obtained,finally,the slippage characteristics of the wire rope and the drum groove under different friction coefficients are analyzed.Results show that the effect of pitch can be neglected when the pitch is much smaller than the diameter of drum,and the friction coefficient not less than 0.2 is better.