Design And Experimental Research On Density Planting Unit For Soybean Maize And Peanut

With the popularity of the conservation tillage technology, the 2BMFJ Series No-tillage Precision Planter developed by Northeast Agricultural University has been widely applied with its original crossrange clear and cover straw seedbed Readiness technology. As the seeder seriation research and development, there is a need to meet the demand for soybean, maize and peanut sowing. Therefore, to improve the working performance and the utilization of machine, design a commonality seeding unit which is combined with density planting agricu ltural and can sow a variety of crops has very important significance. Based on the further research of the precise sowing technology and the sowing machine domestic and overseas, this paper adopted the methods of theoretical analysis, simulation analysis and experimental investigation,completed the design and experimental investigation of density planting unit for soybean maize and peanut. The main work contents are as follows:(1) Based on search information widely and realize the demands of density planting agricultural, come up with the overall design scheme of density planting unit for soybean maize and peanut.(2) Through the experimental investigation of the typical seed metering device, it is concluded that the type of seed metering device is the main factor s towards planting distance qualified rate, multiple rate and variable coefficient. Especially operating speed towords the missed rate is the most important influence factor obviously. Performance between air-suction seed metering device and mechanical seed metering device has no difference when the operating speed under 5 km·h-1. Performance of air-suction seed metering device is better than mechanical seed metering device when the operating speed over 5 km·h-1and the CV of mass of 100 seeds greater than 7.6 %. And selects the air-suction seed metering deviceⅠas the sow unit of the commonality seed metering device.(3) Research and improved design the commonality seed metering device. Analysis the performance influencing factors of the air-suction seed metering device, used the quadratic regression orthogonal rotary experiment design method, established the mathematical regression model between pore size, negative pressure and operation speed of the three factors and the response function, then do the optimized analysis. Finally determined the parameter of the commonality seed metering device to sow the soybean, maize and peanut. The parameters are as followers. The suckers number of seed plate for soybean is 52, its diameter is 4mm. The suckers number of seed plate for maize is 26, its diameter is 4mm. The suckers number of seed plate for peanut is 52, its diameter is 5.6mm. And the diameter of seed plate above all are 220 mm.(4) Research the theory of seeder profile modeling principle in-depth, using the ADAMS simulation analysis software to compare the multi-hinge joint parallel four- connecting rods profile modeling principle with the multi-hinge joint multi-connecting rods profile modeling effect, and designed the profiling mechanism with the latter principle. Design the colter boot, roller sealer and other related parts, then trial-manufacture the sample machine and do the ditching depth stability test. Test show that the furrow depth acceptability of designed seeding monomer is 83.33% on average, the furrow depth stability coefficient is 84.32% on average, indicate the unit profiling stabilized and reliable, and can satisfy the requirements of the precise profiling.