Design And Simulation Of Vibration Harvesting Device For Ma Yam Based On Discrete Element Method

Ma yam is a precious ingredient and also a medicinal material,and has a long history of cultivation in China.In view of the difficulty and the high damage rate of harvesting ma yam,according to the requirements of Ma yam planting and harvesting agronomy,a single-row two-dimensional vibrating ma yam harvester was designed.Starting from the research method of numerical simulation,the simulation analysis of the structure and operating parameters of the two-dimensional vibration component was mainly carried out,the main work content is as follows:1.By investigating the agronomic requirements of Ma yam planting in Anping County,Hebei Province,a single-row vibrating Ma yam harvester was designed,the operating mode of the machine and the main structural parameters were determined,and the chain of the Ma yam harvester was ditched and auger dredged.Key components such as suspension,suspension and two-dimensional vibration device have been designed and calculated in detail.2.The density,length,radial dimension,compressive strength,bending resistance and shear strength of Xiaobaizui Ma yam were measured.The bimodal distribution model of Ma yam discrete element was established using EDEM software.The intrinsic parameters of the model(normal stiffness,tangential stiffness,critical normal stress,critical tangential stress),contact parameters between sandy loam substrates(collision recovery coefficient,static friction factor,rolling friction factor and surface energy),The contact parameters between Ma yam and steel(collision recovery coefficient,static friction factor and rolling friction factor);the contact parameters between Ma yam and sandy loam(important parameters such as collision recovery coefficient,static friction factor and rolling friction factor)were obtained through calibration experiments,which provide reliable parameters for establishing the discrete element harvesting model of Ma yam.3.Using drum,collapse and FT4 rheological simulation experiments,the relationship between the particle scale and the response values of the dynamic accumulation angle,flow quality,flow rate and energy change of the particle group was explored,in order to establish the discrete element scale harvest model of hemp yam Laid the theoretical foundation.4.A discrete element simulation model of Ma yam-sandy loam was established.The minimum broken rate of Ma yam bonding bond and the maximum breaking rate of sandy loam bond were optimized.The forward speed,vibration frequency,and vibration amplitude of the Ma yam harvester were used as variables.The structure and operation parameters in the harvesting process were analyzed by single factor and response surface numerical simulation.The correlation between the forward speed,vibration frequency,vibration amplitude and the crushing rate of sandy loam soil and the crushing rate of Ma yam was obtained,and the optimal operating parameters of the Ma yam harvester were determined.