Research On Key Technologies Of Self-propelled Pinellia Ternata Fertilizer Seede

Pinellia ternata is a famous Chinese medicinal herb in Guizhou.The market demand for Pinellia ternata is strong,and the price per kilogram is as high as 100-120 yuan.Every year,China’s domestic demand and total export volume are increasing year by year,approximately 80000-10000 tons.In recent years,the planting area of Pinellia ternata in Guizhou Province has reached about 7000 hectares,with an economic output value exceeding 1 billion yuan,greatly contributing to the poverty alleviation work in Guizhou.Although Guizhou Province is the main production area of Pinellia ternata,its geographical environment is karst terrain,with crisscrossing hills and steep terrain,making it difficult to carry out mechanical operations on Pinellia ternata planting plots.At present,the planting of Pinellia ternata is mostly manual work,which requires a lot of time and labor.This article aims to design a self-propelled Pinellia ternata fertilization and sowing machine to address the above issues,and verify its operational performance through bench and field experiments.The main research content of this article is as follows:(1)Design of a self-propelled Pinellia ternata fertilization and sowing machine.According to the agronomic requirements of Pinellia ternata planting in Hezhang area,Guizhou Province,a self-propelled Pinellia ternata fertilization and sowing machine is designed with a working width of 80 cm,a sowing rate of 200 ± 30kg/mu,and a fertilization rate of 50 ± 5kg/mu.The sowing and fertilization are evenly distributed,and the structure and working principle of the sowing and fertilization devices are explained separately.(2)Parameter analysis and design of key components of the seeding device.By analyzing the factors that affect the filling time of the seeding wheel and combining with the three axis dimensions of Pinellia ternata seeds,the diameter of the seeding wheel and the width of the irregular groove were determined to be 80 mm and 12.1mm,respectively.By analyzing the ideal distribution of Pinellia ternata seeds,it was determined that the rotation speed of the seeding wheel and the number of irregular grooves on the seeding wheel were56.25r/min and 4,respectively;Based on the principle of zero speed seeding,the guiding direction of the guiding working surface is determined to be opposite to the forward direction of the entire machine,and the seed landing angle is 80 °.By analyzing the motion of the seed on the guiding working surface,the parameters of the cross-sectional curve of the guiding working surface are determined;Based on the ideal effect of sowing Pinellia ternata and the motion analysis of the seeds after leaving the guide working surface,the inclination angles of the four adjacent unit diversion channels in the diversion module were determined to be 57.69 °,60.67 °,63.20 °,and 65.36 °,respectively.(3)Simulation experiment on the seeding performance and spreading performance of the seeding device.To improve the seeding performance and seeding performance of the seeding device,EDEM seeding performance simulation tests were conducted on the structural dimensions of the irregular groove of the seeding wheel,and EDEM seeding performance simulation tests were conducted on the structural dimensions of the splitter plate.Through a single factor experiment and a center rotation combination orthogonal experiment,it was determined that when the seed storage height,depth of the irregular groove,and inclination angle of the irregular groove were 7.10 mm,13.20 mm,and 73.74 °,respectively,the seeding performance of the seeder reached its optimal level.At this time,the average seeding rate was 127.90g/s,and the coefficient of variation of seeding uniformity was 11.17%;When the length and width of the splitter plate are 21.26 mm and 9.11 mm respectively,the coefficient of variation of lateral uniformity is the smallest,with a coefficient of variation of 4.59%.(4)Bench and field experiments.The performance of the seeding device was verified through bench tests,and the test results showed that the coefficient of variation of lateral uniformity of the seeds within the working width was 4.70%,with an error of 0.11%compared to the simulation test.The average total mass of seeds in the inoculation box is289.13 g,with a relative error of 3.62% compared to the theoretical sowing amount of 300 g per square meter.The structural dimensions of the splitter plate and the irregular groove of the seeding wheel are accurately and reasonably designed,and the seeding performance and spreading performance of the Pinellia ternata sowing device meet the agronomic requirements of Pinellia ternata sowing;When the conveying speed of the conveyor belt is0.19m/s,the fertilization amount is 50kg/mu.Through the performance test of the entire machine,it is found that the variation coefficient of the mu sowing amount,mu fertilization amount,and seed lateral uniformity is consistent with the agronomic requirements and simulation test results of Pinellia ternata planting.The sowing and fertilization effects are good,and the designed self-propelled Pinellia ternata fertilization and sowing machine meets the operational requirements and can be used for Pinellia ternata planting in Hezhang area,Guizhou Province.