Picking Dynamic Analysis and Experiment of Shovel-finger and Finger Roller Peanut Pickup Device
Two-stage harvesting is the main way of peanut mechanized harvesting,and the pickup device is a core parts of the combined combined harvester.In order to solve the problem of pod loss caused by"stack","impact"and"throw up"of peanut plants of traditional cam slide spring-finger cylinder pickup device,the shovel-finger and finger roller peanut pickup device was invented and developed for picking up performance test on the basis of studying the peanut plant windrow picking characteristics.The peanut windrow pickup test shows that shovel-finger insert into the soil surface and shovel up peanut windrow,pickup fingers complete the follow-up picking work but not into the soil surface.The main parameters affecting the motion state were obtained by the motion state and force analysis of peanut plants in the shoveling,picking and pushing stages.The overall structure of shovel-finger,pickup-finger and shell were designed based on the parameters.On this basis,the mathematical model of pickup finger motion is established,the key parameters affecting the pickup motion trajectory are determined,and the range of pickup parameters is obtained by ADAMS motion simulation.According to the optimized design results,the prototype was developed,the running and picked up performance were corried out test.The results show that,the phenomenon of peanut plants stacking and throwing disappeared;through response surface analysis and prototype test,the optimal working parameters of the picking device were obtained as follows:the forward speed Vm was 48.0 m·min-1,the rotational speed N was 45.3 r·min-1,and the ground height H was-18 mm.The picking rate of peanut plants was 98.9% and the pod loss rate was 2.8% under two harvesting conditions of peanut plant moisture content of 15%-17% .According to the experimental observation,the peanut plants mainly showed three kinds of picking states in the picking process:normal windrow,oblique windrow and parallel windrow on the forward direction,which could adapt to the neat and scattered windrow of peanut plants.It will provide technical support for the design of the picking device for the two-stage peanut pickup harvester in the future
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