| Mine hoist is an important equipment in mine transportation and hoisting system.Its performance and quality have an important influence on mining efficiency and personnel safety.Among them,the main shaft device is the key component of the hoist to bear load and transmit power.Therefore,the dynamic characteristics of the main shaft device are closely related to the health of the hoist.This paper takes the main shaft device of the multi-rope friction hoist in a thousand-meter deep well as the research object,and takes the reliable condition monitoring of the hoist as the research objective.The study of the dynamic characteristics of the main shaft device dynamic analysis is carried out,and the following researches are carried out: The structure design,finite element modeling and modal analysis of the spindle device,support characteristic analysis,harmonic response analysis and transient dynamics analysis.The research results will provide a theoretical basis and technical means for the fault diagnosis of the hoist main shaft device,and improve the reliability of the mine hoist condition monitoring.First of all,the structure design of the main shaft device of the hoist is carried out.Including the force analysis of the steel wire rope on the friction wheel,the kinematics analysis of the system,the design calculation of the reducer,the shaft end parameters connected with the hoisting machine main shaft are obtained,the load on the main shaft shaft is analyzed,and the size of each section of the main shaft is determined,Select suitable rolling bearings to support the main shaft,and perform calculation checks on the bearings and main shaft.The results show that the designed spindle structure and the selected rolling bearing meet the conditions,which provide a correct model for the analysis of spindle mode and rolling bearing dynamics.Secondly,in order to prevent the spindle device from resonating or vibrating at a specific frequency,a modal analysis of the spindle device is performed.Based on MATLAB software analysis,the calculated modal natural frequency and mode shape of the hoist shaft in the free state are obtained.The test modal analysis of the hoist spindle is carried out,and the natural frequency and mode shape of the test modal of the spindle are obtained.The calculated modal parameters are compared with the test modal parameters and the modal correlation analysis is performed to verify the use of MATLAB for finite element construction.The correctness of the model provides a correct model for harmonic response analysis and transient dynamic characteristics analysis.Then,based on the Hertz line contact theory and the geometric structure characteristics of the rolling bearing,the dynamic model of the rolling bearing is established,the static characteristics of the rolling bearing of the hoist are analyzed,the static balance equation is determined,the static characteristics of the rolling bearing of the hoist are obtained,and the rolling bearing of the hoist is comprehensively analyzed.Oil film damping and material damping are used for dynamic simulation analysis of hoist rolling bearing,and the influence law of different main shaft speed,radial load,roller number and diameter,and roller length on the support stiffness of hoist rolling bearing is obtained.Finally,the harmonic response analysis of the spindle device is carried out to determine the steady-state response of the structure when subjected to loads with different frequency components,and to explore the influence of system parameters on the harmonic response analysis.The vibration model of the main shaft device of the hoist is established,and the time-history response characteristics of the main shaft vibration at different operating stages in a hoisting cycle are analyzed,including the time-history response characteristics of the main shaft bending vibration caused by radial load and the torsional vibration of the main shaft caused by the torque.The time history response characteristics.There are 59 figures,6 tables and 122 references in this paper. |
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