Study On Inclined Fluted Roller Fertilizer Distributor

Fertilization is an important link in agricultural production.There are many disadvantages such as high cost,high labor intensity and uneven application of artificial fertilization,and the mechanical fertilization was s mall labor,uniform fertilization and so on.Therefore,mechanical fertilization is the main method of fertilization.As the "core" of fertilizer application,the performance of the fertilizer will directly affect the amount of fertilizer,accuracy and stability.The fluted roller fertilizer distributor is one of the most widely used distributor,but the the common fluted roller fertilizer distributor has poor precision and can not guarantee the fertilizer discharging performance.Therefore,it is practical significance and theoretical value to optimize the fertilizer distributor based on the common flutedroller fertilizer distributor.In this paper,the EDEM simulation model was established based on the fertilizer particles and the inclined fluted roller fertilizer distributor to analyse the factors related to the performance of the fertilizer distributor and verified by experiment.The parameters of the key components of fertilizer distributor were optimized.The main work and achievements of the paper are a s follows:(1)The physical and mechanical properties of fertilizer granules were measured and analyzed.The three axis size,particle density,shear modulus,static friction coefficient,moisture content and angle of repose of the fertilizer particles were obtained,which provide basic data for the simulation of discrete element method using EDEM.(2)The movement of fertilizer granules during the fertilizer distributing process was analyzed in theory.Designed the key part of the inclined fluted roller fertilizer distributor.The initial designed of the spiral angle was45 °~85 °,fertilizer discharge tongue angle was 5 °~20 °.(3)Using 3D printing technology to form the key component of inclined fluted roller fertilizer distributor.In order to obtain a better forming quality,the full factorial experiment was carried out with the thickness and the line spacing as the experiment factors,the surface roughness and density as the experiment indexes.Considering the molding cost and forming quality,the optimal layer thickness and line spacing were 0.2mm and 0.15 mm respectively,and the surface roughness and density were18.049μm and 96.445% respectively.(4)The EDEM model of fertilizer granules and inclined fluted roller fertilizer distributor were established to analyze fertilizing performance.The design of fluted roller was manufactured by 3D printing technology to verify the correctness of the simulation results through the bench test.The results showed that: With the increase of the radius of the groove,the amount of fertilizer increased linearly,and the variation coefficient of fertilization amount was decreased;The effect of the spiral angle on the amount of fertilizer was not significant,however the variation coefficient of fertilization amount was decreased by 12.81%~20.82% when the helix angle of the fluted roller was 55° or 75° compared with the plain fluted roller;The fertilization amount increased in linear with increasing of rotate speed,and the variation coefficient of fertilization amount application rate decreased.The relative error between the simulation results and the experimental results was 1.92%~24.50% and the average relative error was 9.20%.(5)According to the inclined fluted roller fertilizer distributor structure,fertilizer discharge characteristic theory and analysis of simulation results a experimental by response surface methodology and the Design Expert software was used to optimize the inclined fluted roller fertilizer distributor,which with the groove radius,rotating speed,spiral angle and fertilizer discharge tongue angle as the experiment factors,the amount of fertilizer and the variation coefficient of fertilization amount as the experiment indexes.The optimum parameters were as follows: the groove rad ius was 13.5mm,the spiral angle was 62°,the rotating speed of the fluted roller was 29.4r/min,the fertilizer discharge tongue angle was 5°.The amount of fertilizerwas18.808 g,and the variation coefficient of fertilization amount was 5.38%.