| In order to improve the seed filling performance and seed carrying stability and reduce seed damage,a pendulum cam type peanut precision seeder is designed to improve the seed filling performance and qualification rate of the seeder by setting a protruding hole on the seed tray to disturb the seed population inside the seed chamber and setting a seed guide groove on the seed tray;the pendulum cooperates with the hole to achieve the functions of soft seed cleaning,stable seed carrying and seed feeding position control during the operation of the seeder;the axis of the seed feeding tube is shaped as the fastest descending line curve to reduce the impact on the seed during transportation.(1)The overall structure and working principle of the seed dispenser are described.Through the force analysis of the seeds inside the seed chamber and combined with the simulation analysis,the structure and dimensional parameters of the type hole and seed guide slot are determined,and the type hole is a semiellipsoidal type with a long axis of 19 mm and a short axis of 11 mm,and the shape of the curve of the seed guide slot is an Archimedean spiral.The working area of the cam was divided according to the force in the process of seed cleaning and seed feeding of the seed dispenser,and the motion law of the pendulum was determined to be five times polynomial motion law,and the cam profile curve was solved.The shape of the axis of the seed feeding tube was determined as the most rapid descending line curve.Through the force analysis of the seeds inside the seed chamber,the main influencing factors of the seed rower on the disturbance effect of the seeds inside the seed chamber and the seed filling performance were determined as the height of the seed layer in the seed chamber and the rotational speed of the seed disc.(2)Taking the pendulum cam type peanut precision seed discharger as the research object,the particle body model of peanut seed and the simulation model of seed discharger were established,and the multi-body kinematic simulation software Adams and the discrete element simulation software EDEM were used to simulate and analyze the seed discharger type hole and seed inlet tube,etc.,and the reasonable parameters of key components were determined.Adams was used to verify the reasonableness of the convex contour line;EDEM was used to compare and analyze the reasonable height of the type hole protruding from the seed tray and the reasonable shape of the seed inlet tube axis.Using Adams and EDEM coupling analysis,the reasonableness of cam working area division and contour curve selection and the working process of seed releaser were verified,and single-factor experiment was conducted to determine the range of influencing factors for bench test.(3)The bench test of the pendulum cam type peanut precision seeder was carried out based on the JPS-12 performance test bench with the seeder speed(15～40 r/min)and the seed population to seeding disc wrap angle(20～70°)as the test factors and the seeding performance pass index,reseeding index and miss seeding index as the test indexes.V8.0.6.1 software was used to analyze the test results and establish the multiobjective parameter optimization function,and the optimal combination of parameters for the seed rower operation was determined as follows: the seed speed was 26 r/min,the seed population to seed rowing disc wrap angle was 46°,the seed rowing performance pass index was 88.76%,the reseeding index was 6.72%,the missed seed index was 4.52%,seed breakage rate of 1.14%,which can meet the requirements of peanut precision sowing. |
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