Simulation And Experimental Research Of Air-blowing Corn Seed-metering Device

With corn as a feed and industrial raw materials and other uses of the increase,the demand for maize is more and more big. In our country the cultivated areareduced year by year, today, only by improving maize yield to increase. Precisionseeding technology is an effective way to improve the yield of maize, and the corecomponent of precision seeding machine is the key to precision seed metering device.In this paper, through the analysis of the metering device working principle andperformance characteristics, selection of air blowing seed metering device as theresearch object, carries on the simulation and Experimental Research on the workingprocess of blowing type metering device, key point to determine the seedingperformance of air blowing seed metering process, to explore ways to improve theoperation performance. The main contents include:(1) Study on characteristics of corn seedsThe Zeyu709, Jinegk968and Changda19of three kinds of corn seed as theresearch object, the characteristics of these three kinds of maize seeds were tested.Measurements included size of three axes, thousand grain weights, seed moisturecontent, density, friction coefficient, stiffness coefficient, elastic coefficient andcoefficient of restitution. To provide basis for experimental study of pneumatic seedmetering device, but also provide a reference for the optimization of exhaust devicedesign and motion parameters analysis.(2) Simulation study on flow field characteristics of the metering device based ongas blowingBased on the analysis of the working process of air blowing seed meteringdevice on the flow field of the seed metering device, the nozzle shape and holeparameters simulation. The simplified model of flow field of air blowing seedmetering device, and using fluent on the flow field simulation analysis of differentangles, air flow cleaning effective angle of blowing type metering device for α1=51degree to56degree angle between the Qing, the best for α1=53degree. The iterativeoptimization method has carried on the structure optimization analysis, analysis tooptimize the nozzle results: β=14°, H1=55mm; discharge simulation for round hole parameters is the result of γ=49°, H2=4mm; Using EDEM software of blowing typecorn precision metering device for dynamic simulation, and it is concluded that theoptimized model rows of performance improvement.(3) Metering device experimental on air blowingThe metering test bench of air blowing seed metering device for metering devicebased on performance. First of all on seeding performance test parameters aredetermined through the air blowing seed metering device air pressure, speed anddirection of the blowing nozzle test, the metering device for maize sowing theblowing direction of90degrees when the metering performance. On the basis ofimproved metering nozzle structure, experiments show that the optimized meteringdevice to some extent improve the metering performance.