The Structural Analysis And Optimization Of Double-Shaft Rotary Cultivator In Paddy Field

Double-shaft rotary cultivator in paddy field is a kind of agricultural equipment used in rice planting,which can complete a series of farming agronomy,such as paddy field soil crushing and pulping,soil leveling,multi-purpose and high efficiency.The machine appeared late in our country,and its design and manufacture mostly rely on the experience of technical personnel.There are many problems,such as unreasonable structure,low utilization rate of materials,mismatched traction power and so on.Therefore,with the help of modern numerical simulation analysis method,it is of great engineering significance to carry out the structural analysis,check and optimization design of the double-shaft rotary cultivator in paddy field.In this dissertation,a model of double-shaft rotary cultivator in paddy field is taken as the research object,and the simulation check and optimization improvement are carried out from three aspects of the transmission system,working parts and bearing frame of the machine.The main contents of this dissertation are as follows:(1)Simulation check and optimization of machine transmission system.The transmission system model of paddy field double shaft beating machine is established by using Romax Designer software,the shaft,bearing and gear of the machine are simulated,and the strength of roller chain is checked and calculated with the help of chain transmission strength formula to verify the reliability of the initial design.According to the check calculation results,the bearing which does not meet the design requirements is selected again.The transmission performance difference between the modified gear set and the standard gear set is studied.The modified gear set can improve the stability and performance of the transmission system.(2)The related problems of blade arrangement of rotary tiller shaft are discussed.Aiming at the problems of symmetrical double spiral arrangement in the initial design,the blades are rearranged to improve the problems of unequal soil cutting ratio of left and right rotating blades and alternate operation.(3)Finite element analysis and strain electrical test of bearing frame.According to the structural characteristics of the frame,the finite element model of the frame is established,and the bending deformation of the frame is simulated by using the finite element software ANSYS Workbench.In order to verify the reliability of the finite element model and simulation calculation,strain electrical test is carried out on the frame with reference to the boundary conditions of simulation analysis.Finally,the mass coupling model of the frame is established,and the strength and stiffness results of the frame in road transportation are solved.According to the situation that the machine has more external excitation,the free mode analysis of the frame is carried out,and the natural frequency and mode shape data of the frame are obtained.(4)The lightweight design of the bearing frame is carried out.In order to reduce the overall quality of the frame,the size optimization design of multiple parts of the frame is carried out with the help of ANSYS Workbench multi-objective optimization module.Through software calculation and combined with the actual situation,a group of reasonable optimization data is determined.After optimization,the frame quality is reduced by 8.07%,the material consumption is saved and the manufacturing cost is reduced while ensuring the use strength requirements.