Research On Vibration Characteristics Of Cable In Vertical Shaft Winding Hoist System Based On Finite Element Method

Hoisting system is the throat of the mine,which is also an important link to ensure personnel and ore to run between wellhead and bottomhole.Hoisting wire rope is an important part of mine hoisting system,and it is also a weak link.The safety of the rope affects the stable operation of the whole hoisting system.The theoretical analysis and experimental verification are used in this paper.The vibration characteristics of wire rope are derived,which supports the theory to guarantee the safety of hoisting system.In order to study the mechanical properties of steel wire rope,the stress distribution characteristics of the steel wire inside the wire rope are obtained through the finite element software ANSYS.In order to study the movement characteristics of the steel wire inside the wire rope,the deformation distribution of the steel wire inside the wire rope and the relative movement of the steel wire in different contact states are obtained through the simulation.The vibration characteristics of winding hoist system with string rope are studied firstly in this paper.The coupled longitudinal and torsional vibration model of hoisting system with vertical rope and string rope is established.The vertical rope and string rope are respectively divided into multiple segments and discretized by finite element method.The Lagrange multiplier method is used to deal with the boundary conditions and Newmark method is used to obtain numerical solutions,and the dynamic response of the winding hoist system can be finally acquired.In order to verify the correctness of the theoretical model,the strain value of bearing pedestal on the bottom of the sky wheel is collected by strain gauges,and the calculated tension of vertical rope at the sky wheel is compared with the theoretical model.Three-dimensional model of the 18×7+IWS wire rope is established by Creo2.0 software in this paper,and the various contact states inside the wire rope are analyzed.The grid of the finite element model is divided through a reasonable grid meshing strategy.The contact node is generated and refined in the contact line.At the same time,the middle of the wire rope in vertical direction is refined,and the grid at two sides are gradually thinned.The meshing method can accurately track the change of node data in the middle section.The spatial stress distribution of the steel wire and the stress distribution in the middle section of 1+6 and 18×7+IWS wire rope are analyzed,and the influence of the constraint conditions and the friction between the steel wires is considered.The relative value of maximum equivalent stress in the middle of string rope can be obtained during the operation of the hoisting system.This paper analyzes the spatial deformation distribution and the deformation distribution in the middle section of 1+6 and 18×7+IWS wire rope.At the same time,the influence of the constraint conditions and the friction between the steel wires is considered.By accurately tracking the data of the nodes at different contact positions in the middle section,the relative motion between the wires in contact with each other can be obtained.And the changes of relative motion between the steel wires can also be obtained during the operation of the hoisting system.