Optimal Design Of Planetary Reducer For Cutting Part Of High-power Shearer

As the core component of fully mechanized mining equipment,the coal mining machine has been developed for many years in China,but there is a certain gap between the research level and the foreign research level.With the continuous development of China's industry,the demand for coal resources is increasing,and the researchers have carried out a more in-depth study on the coal mining machine.The performance parameters of all aspects of coal machine have been continuously raised,and shearers are developing towards high efficiency,small volume,high power and high reliability.This paper mainly studies the optimization design of the gear train based on the planetary reducer of the cutting part of a shearer.The feasibility analysis is carried out after the design parameters are put forward,and the feasibility of the optimized planetary gear train design scheme is checked.The power of the motor in the cutting section is 480Kw.The transmission of long-distance torque is realized by the spur gear reducer,and the reduction of speed and the increase of torque are realized by the planetary gear reducer.In this design,the reduction ratio of planetary reducer is increased from 14 to 20 without enlarging the external dimension of reducer as much as possible,and then the output torque is increased.If the output torque of planetary reducer is kept unchanged,the power of motor in cutting section can be reduced,the structural parameters of straight-tooth cylindrical gear reducer in cutting section can be reduced,or the more economical material addition can be considered.Industrial spare parts.The verification work for the optimized planetary gear train mainly includes:referring to the relevant parameters and design criteria of the planetary gear reducer in the cutting part of a shearer,optimizing the design of the planetary gear shafts involved in the shearer's cutting part reducer,and theoretical checking,three-dimensional modeling,interference checking,structural static analysis and modal analysis of the optimized parameters.Based on the static analysis of the finite element software,the optimal design parameters are verified and adjusted according to the distribution of equivalent stress nephogram,contact stress nephogram and bending stress nephogram of the main parts of planetary reducer under loading conditions and the allowable strength requirement of the material.The modal analysis judges the movement of the parts by comparing the resonance speed corresponding to the first ten resonance frequencies of the planetary reducer with the working speed,so as to ensure that the parts designed will not have resonance phenomenon.Finally,the dynamic simulation of the planetary gear train is carried out to check whether there is the phenomenon of backlash impact and the gear meshing output.According to a series of analysis and verification for the optimization design parameters,the design parameters are constantly adjusted,and the relative reliable structural optimization parameters are obtained.The experience has been accumulated for the continuous optimization design of the cutting section of the subsequent shearer.