Structure Improvement Design And Analysis Of Planetary Deceleration Drum For WK-55 Shovel Lifting System

Since the original lifting device of WK-55 large excavator adopts the reducer output end connected with the output drum,the axial size is increased,the floor area of the lifting device is greatly increased,and it is not easy to install and maintain.In order to solve the problem of large overall size,this paper will use the internal gear ring as the design idea of the output mechanism,and design a new type of small tooth difference internal gear as the lifting device of the output mechanism.In this paper,a 2K-H type dual-meshing planetary transmission with small tooth difference is designed and studied.Its basic component is that it has two central gears K and an eccentric shaft H.According to its meshing mode,it is named as the NN type of dual internal meshing gear pair.In this paper,the design and analysis of the planetary reducer with less tooth difference are carried out.The contents need to be completed are as follows :(1)According to the working conditions of WK-55,the lifting device of the excavator is designed,the original structure is optimized,and a new planetary reducer with small tooth difference internal gear as the output is designed.According to the relevant working data of the excavator,the design and calculation of gears,eccentric shafts and bearings are completed,and the corresponding data are optimized.The calculation and verification of important parts such as shafts,bearings and connecting bolts are carried out,and the corresponding modeling is completed by using 3D modeling software.(2)The kinematic analysis of the model is carried out by Recur Dyn software.According to the actual working conditions,the constraints and conditions are added to obtain the acceleration line diagram,the output velocity line diagram and the displacement line diagram of the gear.Then,the dynamic analysis is carried out,and the gear is treated with flexibility.The stress changes of the gear during the movement are observed,and the maximum stress point of the gear is found for analysis and verification.The force line between the teeth is obtained,and the analysis results are obtained.(3)The static finite element analysis of planetary shaft,base and arm bearing of planetary reducer is carried out by using finite element software.The corresponding stress nephogram and strain nephogram are obtained,and the maximum stress point and maximum deformation are analyzed and checked.(4)The modal analysis of the planetary shaft,gear and the whole machine of the reducer is carried out by using the finite element software,and the natural frequency and vibration mode diagram are obtained.The resonance of the corresponding parts in the operation process is checked.