Design And Performance Test Of Magnetic Finger Clamp Seed Exporter

As the key core component of the precise corn seeder,the seed metering device mostly adopts air suction type and bucket wheel type.However,when this type of seed-metering device is used for no-till planting operation in the alpine and arid areas,there is a problem of poor seeding performance due to the large amplitude of vibration caused by uneven ground.The no-tillage operation of traditional pickup finger seed-metering device is less affected by the terrain,but there are problems such as low reliability due to the long-term use of spring fatigue strength and anti-slack performance,which is not conducive to the promotion of no-till land in cold and arid areas.In view of the above problems,this research previously queries domestic and foreign research status of pickup finger seed-metering device and magnetic seeding technology and considers theoretical mechanics,magnetic field statics and other th eories to design magnetic pickup finger seed-metering device,which is treated by seeding performance tests and the optimization of combination of factor levels.The main contents are as follows:(1)The seeding principle of seed-metering device is analyzed,and corn seeds in cold and arid areas is selected to measure its physical parameters,such as triaxial size,thousand-grain mass,density,water content,friction angle,static friction coefficient,which provides important parameter basis for structure analysis and simulation of seed-metering device.(2)The sowing operation is divided into four stages:picking,carrying,clearing,and delivering.The structure and working mode of magnetic pickup finger seed-metering device are researched to optimize the pickup finger clip model and design the cam mechanism working angle that the maximum opening angle of finger clip is 20°,the duration angle of seed charging is 160°,the clamping angle of finger clip is 30° and the pushing angle of finger clip is 150°.(3)The magnetic field of the permanent magnet is simulated using Maxwell magnetic simulation software to explore the magnetic induction intensity distribution and analyze the uneven distribution of the magnetic induction intensity of permanent magnet.(4)According to the single factor test that takes the grain distance qualification index,grain distance reseeding index,and grain distance missing index as test indicators,the effect of seeding height,seed-metering device speed,vibration,and magnetic induction intensity on the grain distance qualification indes is significantly,and the effect of inclination on seeding performance is little and not considered.According to the orthogonal test that takes the vibration frequency,amplitude,and magnetic induction intensity as the test factors and the grain distance qualification index,grain distance reseeding index and grain distance missing index as the evaluation indexes,the optimal combination to meet the seeding conditions is that the vibration frequency is 6Hz,vibration amplitude is 3.1mm,magnetic induction intensity is 316.34mT.Under this condition,the qualified rate of plant distance is 91.7%,the reseeding rate is 6.2%,and the missed planting rate is 2.1%,which can meet the requirements of agricultural sowing...