Study On Mechanical Modeling And Mechanical Properties Of Main Shaft Device Of Multi-rope Friction Hoist

At present,multi-rope friction hoist is the key equipment used in shaft hoisting system of large mines.The main shaft device is the core component of multi-rope friction hoist,whose mechanical properties affect the safety and reliability of the hoist directly.The main shaft device of friction mine hoist is studied,along with the modeling approach of critical components and overall structure thorough theoretical and experimental study.The theoretical analysis,numerical simulation,and experimental validation are used to study the mechanical properties of critical components and main shaft device.The research results will provide theoretical support and technical means for the reliable design of main shaft device of mine hoist.Firstly,the mechanical modeling of stepped main shaft are studied.Taylor-like polynomial is introduced to describe the displacement field over cross-section of shaft based on the Carrera unified formulation.Combined with the virtual displacement principle,the dynamic model of main shaft is obtained.The one-dimensional refined mechanical model of the main shaft is validated by experiment.Secondly,the mechanical properties of the main shaft-friction wheel connection structure are studied based on the theory of refined two-dimensional plate.In order to solve the problem of low efficiency of traditional four-node element partition,a sixnode plate element suitable for circular plate and circular plate is constructed with the method of mixed interpolation of tensor components,and the mechanical model of the main shaft-friction wheel connection structure is established.The influence rule of bolt arrangement on the stress distribution of flange connection is revealed.Next,the dynamic characteristics of cylindrical shell of friction wheel are studied.In view of the geometric characteristics of cylindrical shells,orthogonal curvilinear coordinate system is used to describe the three-dimensional geometric characteristics of cylindrical shells.The refined mechanical model of friction wheel annular rib cylindrical shell is obtained by combining finite element model of cylindrical shell,the mechanical model of annular flange with the mechanical model of annular rib.The availability of refined mechanical model of circular rib cylindrical shell with friction wheel is validated by experimental verification,and the influence of geometrical dimensions and number of circular rib on dynamic performance of circular rib cylindrical shell with friction wheel are studied.Finally,the dynamic behavior of main shaft device of friction hoist is studied.Based on the mechanical model of key components established in the first three chapters and combined with the displacement coordination conditions of the joints on the contact surface of the components,the motion equation of the main shaft device of multi-rope friction hoist is established.The field experiment verifies the efficiency and availability of the model.This thesis has 78 figures,25 tables and 153 references.