Design and Optimization of Bionic Pressing Roller

Abstract

Aiming at the high resistance and "soil accumulation" phenomenon existing in the operation of the traditional potato harvester's pressing roller, this study, based on the non-smooth surface characteristics of the grub and combined with bionics principles to extract the structural features of its back convex hull, designed a bionic pressing roller. The surface morphology of the grubs was obtained by a 3D contour scanner. A roller model with a diameter of 110mm and a width of 580mm was constructed, and the finite element model of the pressing roller - soil was established by using ABAQUS software (the Drucker-Prager constitutive model was adopted for the soil). The simulation results show that the bionic pressure roller effectively eliminates the soil accumulation phenomenon and significantly reduces the working resistance compared with the traditional cylindrical roller. Further through single-factor tests and Box-Behnken response surface optimization, the optimal parameter combination was determined to be a convex hull height of 15mm, an operating speed of 0.72m/s, and a suppression load of 320N. At this time, the traction resistance was 228.64N, verifying the superiority of the bionic structure in drag reduction and surface leveling.