Experimental Study on Scattering Performance of Organic Fertilizer Spreader Based on EDEM

In order to solve problems of poor fluidity and difficulty of mechanical distribution of organic fertilizer， movement model of organic fertilizer in process of distribution was established based on horizontal distribution machine of organic fertilizer made by ourselves，and main factors affecting distribution uniformity were analyzed.SolidWorks software was used to establish three-dimensional models of organic fertilizer and horizontal organic fertilizer spreading machine.EDEM software was used to carry out response surface design experiments with fertilizer feeding speed ratio （operation speed and scraper speed ratio），scattering roller speed and spiral blade pitch as test factors.Design-Expert 8.0.5 software was used to optimize operation parameters，and simulation test and field test were carried out to verify operation parameters.Simulation results showed that the primary and secondary order of affecting lateral variation coefficient of scattering uniformity was as follows: pitch of spiral blade，rotation speed of scattering roller and speed ratio of fertilizer delivery.When fertilizer rate was-16.42，rotation speed of spreading roller was 557.90 r/min，and pitch of spiral blade was 365.40 mm，lateral variation coefficient of spreading uniformity was 14%，and error between verified value and predicted value was less than 5%，indicating that response surface model was reasonable.Field experiment showed that when fertilizer speed ratio was -16.6 rotation speed of spout roller was 560 r/min，and pitch of spiral blade was 360 mm，lateral variation coefficient of spout uniformity was 14.5%，and error was less than 5% with simulation value of EDEM，which met field operation standard of organic fertilizer spout machine，and simulation model and optimization parameters were reasonable.This study could provide a reference for optimization design and performance improvement of organic fertilizer spreader.