| A double ridge--four row peanut seeder was designed based on the agronomic requirements of peanut ridge-till seeding and single seed precise seeding under the condition of sticky soil in paddy fields of southern China.This paper mainly studied the ridging device,driving system and seeding system of the seeder.The research conclusions are as follows:(1)The seed metering disc of spoon-wheel seed metering device and its structural parameters were optimized.Spoon-wheel seed metering device was selected as the research object and the model of seed metering disc and the speed of seed metering shaft were taken as the test factors.The seed spacing qualification index and the rate of damage were taken as the evaluation indexes and the main peanut varieties planted in southern China of Silihong and Xianghua were chosen as experimental materials.Single factor experiments were carried out with the help of JPS-12 seed metering performance test bed.The conclusions are as follows: the model of seed metering disc was large and the speed of seed metering shaft was10r/min when seeding Silihong and Xianghua.(2)The structure and main parameters of double ridge--four row peanut seeder were designed.According to the agronomic requirements of ridge surface,furrow,seed spacing and seed channel of peanut ridge planting,ridging device,driving system and inverted triangle seed channel opener of seeding system were designed respectively.The pattern of ridging device and the arrangement of rotary blades on rotary shaft were determined.The transmission ratio of each level of the transmission system was determined by single factor test.The value range of key structural parameters of the opener was obtained by combining geometry and mechanics theory.(3)This paper designed an inverted triangle seed channel opener.The rotation orthogonal regression test was carried out with EDEM discrete element simulation software,with the channel shape coefficient and traction resistance as evaluation indexes and opening depth,angle between wings and the soil entry angle as test factors.The optimal combination of parameters of the seed channel opener was obtained through tests,which included opening depth of 40 mm,angle between wings of 98°,and soil entry angle of 144°.The soil groove verification test was carried out for the results.The test results showed that comparing with the simulation test,the error of the channel shape coefficient of the optimized inverted triangle seed channel opener was 3.78%,and the error of the traction resistance was 6.68%,indicating that the simulation test results were accurate.(4)The field experiment of double ridge--four row peanut seeder was carried out.Test evaluation index included seed spacing qualification index,rate of damage,qualified rate of seeding depth and channel shape coefficient,ridge stability coefficient and furrow stability coefficient t.The corresponding test results were as follows: 92.24 /93.76、0.14%/0.63%、86%,0.97,97.90 and 95.41 respectively.All the experiment indexes were in line with the technical standards and the requirements of peanut seeding agronomic techniques.And verify the accuracy of simulation and bench test... |
