| In recent years, the technology of biomass energy has made a big development,becoming the most widely used renewable energy, and its usage is second only to the threemajor fossil energy. Among them, the corn stubble has a considerable yield, and with ahigher density, higher calorific value of biomass excellent features，it is a high-quality andhigh-yield biomass energy. In addition, field corn stubble processing has been a majorproblem in agricultural production, need an effective approach. Therefore, the research ofcorn stubble harvesting machinery has practical significance.According to the National Agricultural Science and Technology AchievementsTransformation Fund project "corn stubble collecting machine pilot promotion" issues，thisstudy aims to conduct structural analysis, functional design and optimization on the type of4GS-2corn stubble harvester, in order to get a low cost, compact, stable and suitable for thepromotion of corn stubble harvester.This study analyzes the basic physical properties of corn stubble, determining the cornstubble digging depth and optimal harvest time; then，the methods of digging and separatingof the existing corn stubble harvester is explored, so that we confirm a digging equipmentwith offset type digging shovel and a separating mechanism with bionic roller and grid. Onthe basis of the type of4GS-2corn stubble harvester’s existing structure, we add a diggingequipment of corn stubble in the front of harvester to reduce the work link of root stubbleharvest. secondly, design a suitable native corn stubble automatic unloading equipment,improve operational efficiency of the machine. improving the machine’s operationalefficiency, and achieving a corn stubble digging, picking up, removing soil, transporting,gathering and harvesting technology stack. we complete the whole virtual prototype buildwith the use of Pro/E software, and then the body motion simulation results show that thewhole well-functioning, non-interference. Finally, analysis and calculation the trafficabilityof the corn stubble harvester.Through building a beam element model of the corn stubble harvester’s frame throughANSYS, this study analyzes the load and constraints of the frame under the workingconditions of bending and the extreme conditions of bending and torsion, while studying andexploring the stress distribution and deformation of two typical conditions to laid thefoundation for the subsequent lightweight research on the frame; In addition, the study establishes finite element models of digging device, picking-up device, transporting device,roller and frame in the ANSYS workbench, and conduct a constraint modal analysis. As aresult, we obtain the first six natural frequencies and mode shapes associated with thecharacteristics of each component. And then analyze the weak vibration position of eachcomponent, and the resonance condition which may be caused by the corn stubble harvester.On the basis of the finite element static analysis and modal analysis，this studyoptimizes the frame structure improvement and beam size of each part separately, combiningwith the situation of the prototype in the early field trials. In order to improve the vibrationof the frame structure, two reinforcing beams are optimized, and after that, the first threeorder modal are increased to some extent; material size of each part of the frame beam isoptimized aiming at a lightweight frame; the final frame optimization scheme is determinedwhen we have analyzed how the five parts (bottom beam, upper beam, front beam, rear beam,reinforcing beam) of the frame influence the frame stress and deformation. By optimized, thequality of the frame is169.23kg, dropping12.44%compared with before optimization，andoptimization effect is obvious. |
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