Design and test of soil-fertilizer mixing and covering device for orchard manure deep application machine
Aiming at the problems of excessive concentration and low utilization rate of fertilizer in the traditional deep application of orchard manure,this paper designs a soil-fertilizer collision mixing soil covering device,which is mainly composed of ditching mechanism,diversion mechanism and fertilizer discharging mechanism.The kinematics analysis of the manure particles in the screw auger fertilizer conveying mechanism and the kinematics analysis of the soil particles in the cutting and throwing process and the diversion and stratification process were carried out,and the key parameter ranges were determined.Further,the bench test was carried out with the rotation speed of the cutter head,the rotation speed of the auger and the deflection angle of the soil plate as the factors,and the uniformity of soil and fertilizer mixing as the evaluation index.The results showed that the mixing uniformity of soil and fertilizer was 86.39％when the rotation speed of cutter head,the rotation speed of auger and the deflection angle of soil separating plate were 152 r·min-1,138 r·min-1 and 29°,respectively.The optimal parameter combination was tested and verified.The results showed that the mixing uniformity was 88.02％,and the relative error with the theoretical result was 1.89％,indicating that the mixing performance of the device was good and could meet the requirements of soil and fertilizer mixing operation.The results of this study can provide an important reference for the design of soil-fertilizer mixing machinery.
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