Simulation And Application Research On Axial Motion Of The Automatic Orientation Of Ovoid Agricultural Products

The ovoid agricultural products is automatically oriented according to the pointed and blunt ends,which is convenient for transportation,increases the aesthetics and additional value of the products.The automatic orientation system of ovoid agricultural products based on convey rollers and guide rod mainly depends on the axial motion and turnover motion of ovoid.However,the characteristics of the long and short axis,surface condition,centroid position of the individual eggs are random,and the structural parameters of the processing device and the system operating parameters are different,so that the law of axial motion in the orientation is complicated.What's more,the frictional force and contact point trajectory during axial motion are difficult to measure by traditional physical tests.It is impossible to verify the results and hypotheses of the dynamic theory analysis of the axial motion of the ovoid.Therefore,in order to study the law of axial motion,the simulation model of the ovoid axial motion was established.Based on the model,the dynamic parameters of the ovoid axial motion were studied.Also,the dynamic mechanism of the ovoid axial motion transmission and the force balance were analyzed.The mechanism of the horizontal deflection angle in the automatic directional motion was illuminated and the theoretical formula of the horizontal deflection angle was verified.Finally,the axial motion parameters and segmental device parameters of the egg were optimized.The main conclusions were as follows.Based on ADAMS and MATLAB,the simulation model of ovoid axial motion was established.The 3D simulative ovoid with controlled basic characteristic parameters was used to verify the simulation model.The actual and simulated values of axial displacement and horizontal deflection angle were measured and compared.The variation law was consistent.Accordino to the axial motion formula of the displacement,the actual and simulated value of the correction coefficient k was not much different,and the relative error was within 10%,indicating that the simulation model was effective.It is feasible to use simulation model to study the axial motion of the ovoid.Based on the model,basic characteristic parameter,structural parameters of conveyor roller and working parameters of conveying system were precisely controlled.Also on this foundation,the influence of these factors on axila motion were investigated further.The results showed that J/L,?,v D,E affected the axial motions greatly,the following was L and B,m affected it not obvious,and in certain range,? had significant effect on it.Taking axial motion efficiency as evaluation index,GA-BP and RSM were used to optimize the working parameters of axial motion of eggs based on the model.The results showed that GA-BP was better than RSM.The optimal axial motion efficiency was 86.56%.The best working parameters were: the diameter of the conveyor roll was 50 mm,the sapcing was 10 mm,and the rotate speed was 3 rad/s.At the same time,the working parameters of duck and goose egg axial motion were optimized by GA-BP.The optimum axial motion efficiency was 87.88% and 87.02% respectively.The optimal working parameter: the diameter was 50 mm,the sapcing was 12 mm,the rotate speed was 3 rad/s and the diameter was 58 mm,the sapcing was 15 mm,the rotate speed was 3 rad/s respectively.Based on the axial motion simulation model,the dynamic characteristics of the ovoid were analyzed.The simulation results of vertical deflection angle,horizontal deflection angle,velocity and acceleration were consistent with the results reported in related researches.The force and torque of the ovoid were balanced,and it was a dynamic balance.In the ideal status,it belonged to the three force balance intersection;On the side of the the blunted end,the ovoid was spirally driven by the friction of the contact point,the conveying roller that is in contact with the pointed end functioned as a balance follower,the result was consistent with the theoretical assumption that the conveying roller is driven by one side and the other side is followed;the couple composed of the components of the resultant force on the axial direction of the conveying roller was a driving couple formed by the horizontal deflection angle of the oval.The couple composed of the components of the resultant force on the horizontal direction perpendicular to the axis of the conveying roller was a resistance couple.When the two couple balanced,theoretically a stable horizontal deflection angle was formed.Actually,a dynamically adaptive relatively stable horizontal deflection angle was formed.Based on the axial motion simulation model,the ? and ?' were measured under different levels of L and B.The experimental results showed that the relative errors of the theoretical and measured values were within 15%,which indicated that the theoretical formula of the horizontal deflection angle established by the gecometric method was reasonable.On the basis of actual situation and GA-BP optimization results,the march-past interval length,the channel width,the conveying roller material,the diameter of conveying roller,the sapcing and the rotate speed of the eggs,duck eggs,goose eggs orientation devices were optimized.The materials of conveyor rollers are nylon;the diameters are 50 mm,50 mm and 60 mm respectively;the spacing are 10 mm,12 mm and 15 mm respectively;the rotate speed are 3 rad·s-1,3 rad·s-1 and 3 rad·s-1 respectively;the march-past interval length are 450 mm,450 mm and 750 mm respectively;and the width of the channels are 130 mm,130 mm and 200 mm,respectively.For the ovoid agricultural products automatic orientation system,the axial motion subsystem composed of two conveyor rollers and agricultural products belongs to the multi-rigid system of dynamic theory.Its dynamic relationship meets the requirements of Lagrange equation.The virtual mechanical system of the axial motion subsystem constructed by ADAMS can analyze the static,kinematic and dynamic properties of the ovate agricultural products.This created conditions for the oretical analysis of the ovate agricultural products axial motion and the reduction of the actual experimental workload.