Research And Experimental Verification Of The Performance Of Flat Fritillaria Covering Components Based On EDE

Since the 21st century,with the continuous improvement of people’s income level and quality of life,China’s demand for fritillary bulb and its deep-processing products has also increased day by day.The gap between supply and demand in fritillary bulb market has been expanding,and the planting area of fritillary bulb in the province has increased significantly in recent years.At present,the planting and soil covering of fritillary bulb still rely on manual work,and the mechanization rate is very low.Aiming at the above problems,this paper designs and develops the soil covering parts of fritillary bulb,studies the soil covering performance of the soil covering parts combined with the discrete element method,analyzes the simulation test results,obtains the optimal combination parameters of the soil covering parts of fritillary bulb,prepares the prototype and carries out field test verification.The main research work is as follows:(1)This paper studies the agronomic requirements of fritillary bulb covering soil,designs the covering parts of fritillary bulb,designs and calculates the main parameters of the covering parts of fritillary bulb,determines the main parameters such as screw covering soil device,shaping shovel and transmission ratio,draws the three-dimensional model of fritillary bulb covering soil machine with UG software,and completes the part assembly and motion interference inspection.(2)The physical parameters of the sampled soil are measured through the soil texture test,density test and angle of repose test.According to the measured soil particle size distribution,sample soil density and stacking angle,the surface energy and contact parameters of the sample soil are calibrated through the climbing test and the quadratic orthogonal combination simulation test of design expert software box Behnken design.(3)The soil contour curve is drawn according to the accumulation of soil formed between the side plate and the border surface by the covering shovel at different walking speeds of the field pre experimental machines and tools.The size and shape of the particle factory and the total particle mass are determined by using the origin image integral,the simulation environment and simulation model of the covering parts are established,and the contact models between soil and soil,soil and machines and tools are selected.(4)Determine the walking speed,spiral speed and spiral spacing as the influencing factors,and the qualified rate of soil coverage and coefficient of variation as the test indexes.Analyze the relationship and influence of each factor on the soil covering operation indexes by using the single factor test method,determine the variation range of the test factors,use the central composite design center in design expert to design the test,and use the quadratic regression orthogonal rotation method to carry out the simulation test,The interaction analysis of response surface is completed,and the simulation test results and regression equation are analyzed.The analysis results are as follows: when the maximum soil coverage Y1 is 97.85% and the minimum coefficient of variation Y2 is 7.96%,the optimal combination parameters are obtained: walking speed 0.39m/s,screw speed 253 rpm and screw spacing 145 mm.(5)The relative variation rate of the sample soil is 72.9%,and the average variation rate of the sample soil is less than or equal to 79.9%,and the average variation rate of the sample soil is less than or equal to 12.9%,which meets the requirements of the field test.