Study On Finite Element Analysis Of Peanut Harvester Picking Process And Optimization Of Key Picking Mechanism Structure And Parameter

Peanut harvester is the indispensable device during the mechanization process ofpeanut production and one of the most crucial components of peanut harvester is thepicking mechanism, of which the structure design and parameter selection can directlyaffect the net nut-picking rate and the broken rate. Design and optimization of thepicking mechanism, as a result, is becoming the emphases of the peanut harvestingdevice manufacturing industry.At present, the design and optimization of our country’s peanut harvester pickingmechanism still relies mostly on the traditional field testing method and theoreticalanalysis method, the former method above, however, calls for huge manpower andmaterial resource and also lacks of technical guidance on the structural design andimprovement. There are also a great limitations in the application of the theoreticalanalysis method. In recent years, the finite element simulation technology has beengaining ground in the agricultural machinery manufacturing industry and also be used inthis paper on the optimized design of the peanut harvester picking mechanism. In orderto observe and analyze the partial physical phenomenon, such as the contactdisplacement and the impact forces, simulation analysis of peanut harvester nut-pickingprocess is firstly conducted by using ABAQUS software, and then this simulationmethod is used to the optimized design of peanut harvester picking mechanism after thevalidity and rationality of simulation analysis has been verified through experimentresearch.Firstly, the general methods, among which the numerical calculation method andits finite element realization was studied emphatically, was put forward in this paper toanalyze the dynamic response during peanut harvester picking process after thecollision-impact characteristics had been analyzed. Then several key techniques werecarried out when usingABAQUS software in the finite element simulation.Secondly, the simulation process was conducted in the ABAQS/Explicit processorjust after the finite element models were constructed according to the actual structuralstyle and dimension of picking roller and peanut in ABAQUS/CAE module. Then the simulative impact forces that exerted on the peanut by picking roller laminas wereobtained after the inquiry and analysis to the simulation results.Thirdly, after experiment project and the innovative nut-picking test-bed weresettled down based on the operational principle of peanut harvester picking mechanism,the nut-picking experiment was conducted successfully, during which the dynamic forcedata were collected by the dynamic force measuring&displaying equipment. Theexperimental impact force exerted on the peanut by roller laminas was firstly obtainedby handling and analyzing the dynamic force data that collected just before, then wascompared with the simulative impact force gotten from the finite element simulation,proving the validity and rationality of the simulation analysis.At last, based on the peanut plant mechanical properties, the roller’s rotate speed,which is the main working parameter of peanut harvester picking mechanism, wasselected with the help of finite element simulation technology, and the optimized rangeof rotate speed was chosen too. In addition, in order to lower the broken rate duringpeanut harvesting process, rules how roller laminas’ overlap ratio influence the brokenrate was studied, as well as the structural deficiencies of existing roller laminas. Thensome improvements and refinements were made on the roller laminas’ structure,innovatively designing a new efficient type of picking roller, where radial distance andlaminas’overlap ratio between two picking rollers could be adjusted at will.