Study On Vibration Characteristics Of ZZDP1000 Mine Hoist Planetary Gear Reducer

Planetary reducer is an important part of mine lifting equipment,due to the large volume,heavy quality,complex conditions,in the actual operation process,it is subject to internal dynamic excitation and external dynamic excitation together,so its dynamic characteristics are more complex,and the coupling vibration of the transmission part will accelerate its failure.In order to ensure safe and reliable operation of the hoist,but also a reasonable optimization of its structure,it is necessary to study the dynamics of the reducer.In this paper,the ZZDP1000 planetary reducer is used as a research object under the support of the National Science and Technology Support Project(Project No.2013BAF01B05).The inherent characteristics of the planetary gear reducer,transient dynamic characteristics and dynamic response testing of the whole machine are the focus of the study.Which provides theoretical reference for weight reduction and noise reduction and structural optimization of planetary reducer.The finite element method is used to analyze the natural frequency and the modal shape of the planetary reducer,which lays the foundation for the research of the dynamic characteristics.In the process of planetary reducer operation,there are internal dynamic excitation,such as gear time-varying meshing stiffness excitation,error excitation,tooth side gap excitation and tooth surface friction excitation.The system dynamics model is established by the theory of elastic dynamics,and the model is solved by the central difference method.The three-dimensional non-contact finite element model of planetary reducer train-bearing-box is established under the consideration of non-linear factors such as contact stiffness,system damping and comprehensive error.Using the display algorithm,the meshing-impact transient dynamics simulation of the reducer is realized,and the stress-strain and the vibration characteristics of the components are obtained at any time under the rated working condition.The dynamic contact stress of the helical gear,sun wheel and planetary wheel is analyzed to judge the load characteristics of the gear transmission system.The vibration characteristics of the box surface are analyzed,and the vibration intensity,acceleration and structural noise of the box are analyzed.The dynamic characteristics of the planetary reducer are analyzed for the different input speed and the eccentricity of the sun wheel,which can provide reference for the actual operating condition selection and manufacturing precision of the reducer.The vibration acceleration of the surface of the box under various operating conditions was measured on the test bench,and the vibration characteristic response was analyzed.The effective vibration velocity and vibration intensity of the tested points are calculated by numerical integration method,and the simulation results are verified by comparison with the simulation values.