Lightweight Design And Flow Field Analysis Of Wheat Peeling Machine Rotor

Wheat peeling and milling technology has always been the forefront of research at home and abroad,but also the focus of research in the field of agricultural engineering.This research takes FBPY wheat peeling machine as the object,in which the rotor structure parameter of wheat peeling machine is one of the core technologies of the wheat peeling machine,and it is also the vital component of the new wheat peeling processing equipment and the most direct power source in the process of wheat peeling processing.However,the rotor structure of the peeling machine designed according to the traditional experience or theory is difficult to meet the requirements of modern agricultural refinement and agricultural machinery refinement,and its structure still has some room for improvement,some structural characteristics are lack of analysis.In this paper,the rotor of FBPY wheat peeling machine was taken as the research object.According to its working characteristics,the structure characteristics and flow field characteristics were analyzed by using numerical calculation method.The main contents are as follows:Firstly,In order to solve the bottleneck problem of radial expansion of wheat peeling machine rotor,according to the deformation characteristics of the rotor longitudinal beam under load,the deformation distribution data of the rotor longitudinal beam were fitted,and the two-step strategy optimization method and image symmetry compensation technology were used to compensate the structure of the model.The first step:according to the theoretical calculation,the centrifugal load on the rotor was calculated,and the range of design variable p_i,safety factor and allowable stress were determined;the second step:the descriptive function of sweep path of longitudinal beam was determined,and the central composite design method(CCD)was used to generate samples.Lastly,3 candidate points were obtained,and the optimal solution was selected by comparison.The results show that when taken candidate point 2 as the optimal solution,the longitudinal beam has the best flatness and the highest safety coefficient.After compensation,the str value of the longitudinal beam has reduced by 64.30%,while ensuring the width of the particle flow channel,the flatness of the longitudinal beam has significantly improved.The research results show that the mirror symmetry compensation technology is effective and feasible for solving the radial expansion deformation of the rotor.Secondly,For sake to solve the problem of excessive quality of the rotor,the lightweight design of the peeling machine was carried out based on its working characteristics.Taking the structural parameters of longitudinal beam and main shaft as input parameters and the total mass of rotor as optimization objective,150 sample points were generated by central composite design method,and the response relationship between input variables and output variables were analyzed combined with the sample values.According to the optimization theory,3 candidate solutions were obtained by experiment.Through comparison,the analysis results show that when taken candidate point 1 as the optimal solution,the rotor mass of the peeling machine was the smallest.At this time,the rotor mass is only 135.71kg,which is73.6kg less than the original structure,and the weight reduction ratio is 35.16%.The weight reduction effect is significant,and the dynamic and static characteristics of the rotor are improved compared with the original structure.Finally,The flow field around the rotor of wheat peeling machine was obtained by Boolean operation,the research scope of wheat particle flow was determined,the research methods and means of wheat particle flow were selected,and the control equations of continuous phase and discrete phase were described.The flow field model of wheat particle flow was determined as turbulence model by calculation,and the flow situation of wheat particle during wheat peeling was simulated by using multi-phase flow solver.Ultimately,the distribution diagram of wheat particles,the equivalent trajectory curve of wheat,the velocity value and the pressure distribution value were obtained.The simulation results show that the wheat particles move in a spiral shape during the peeling process,which is consistent with the prediction and the description of"multi-element gradual pressure peeling"theory,which verifies the feasibility of using fluent to simulate the movement of wheat particles.