Structure Design And Lightweight Research Of New Integral Electric Rotary Tiller

With the rapid development of China’s industry and agriculture,agriculture is also facing environmental pollution and clean energy,so the exploration and research of electric rotary tiller with electric energy as the energy source came into being.Rotary tiller is mainly used for plowing and turning soil in water and dry land.In this paper,a self-propelled rotary tiller with novel structure is designed,which is powered by an external rotor motor,and the whole mechanical structure is optimized by finite element simulation analysis.The main contents of this paper include the following aspects:(1)Firstly,the mathematical model of the blade curve and the bending angle of the blade surface is established to realize the parametric design of the rotary tillage cutter.The static analysis of rotary tillage cutter is carried out,and the soil model is established based on SPH algorithm to do the dynamic analysis of soil cutting.Through the analysis of the equivalent stress-strain,deformation and power consumption curve of rotary tillage cutter,the rationality of simulation analysis is verified theoretically.(2)Secondly,the arrangement of blades on rotary tillage roller is designed.Based on the SPH algorithm,the simulation analysis of rotary tillage cutter roller cutting soil is carried out,and the energy consumption curve and the data of the total reaction force and moment curve of the soil to the roller shaft are obtained.The design of planetary gear reducer and rotary recovery mechanism of rotary plough cutter is also designed.Finally,the structure design of the bearing frame of the new type of self-propelled electric rotary tiller is completed.(3)The finite element model of the frame of the electric rotary tiller is established,and the frame stiffness under bending condition,torsion condition,free mode of the frame and the frame stiffness,strength and deformation under rotary tilling condition are analyzed.The first 10 order modal frequencies,static bending strength and static torsional stiffness of the frame are obtained.On this basis,the subsequent lightweight optimization design work is carried out.(4)Taking the wall thickness of parts as the design variable,120 groups of sample points are established by using the optimal Latin hypercube experimental design method.Taking the mass,modal frequency,bending stiffness,torsional stiffness and the maximum deformation displacement of suspension support as response parameters,the quadratic response surface approximation model is established.In the case of meeting the requirements of various indicators,through the intelligent optimization algorithm,the weight of the rotary tiller frame is reduced to the greatest extent,and the lightweight optimization design is completed.The optimization results show that the total weight of the frame is reduced by about10% by adjusting the wall thickness of the components under the constraints of static stiffness,modal performance and maximum deformation displacement of the key position,which proves the feasibility of lightweight optimization design.In this paper,based on the traditional rotary tiller,a new type of electric integral rotary tiller overall structure is designed and lightweight research is carried out.The overall structure design is further improved,which is of great significance for the future electric agricultural machinery and lightweight research.