A Study Of Bionic Ridger With Tillage Resistance Reduction Characteristics

Ridging shovel-as an important touch soil parts in agricultural machinery,reduces its work efficiency and even shortens its service life as a result of large soilinteraction contact resistance in the process of ridging farming. So it plays animportant role to reasonable change ridging shovel shape structure features forreducing energy consumption and improving the work efficiency. The superhydrophobic microstructure on lotus leaf surface makes it have self-cleaning functionand the micro placoid scale on shark skin surface can effectively reduce the resistancewhen swimming in the water. In this paper the surface modification bionic methodwas used and lotus leaf and sharks were selected as bionic object, nonsmooth surfacewas built in ridging shovel surface, which reduced ridging resistance of ridging shovelin the work. For finite element simulation analysis of ridging shovel-soil model andusing indoor soil bin experiment verified. Significant viscosity drag reduction effectof the bionic ridging shovel was built, which lay a solid theoretical basis for theapplication of bionics research in the field of agriculture and to the practical andindustrialization.Ridging shovel prototype, nine different bionic ridging shovels andcorresponding soil models were established using CATIA three-dimensionalmodeling software. Bionic convex(concave) triangle(circular) trench structure wasextracted from the shield scales rib structure of shark surface, which built the crosssection for12mm wide,5mm high isosceles triangle (semicircle) on the surface ofridging shovel prototype. Bionic convex hull structure was extracted from superhydrophobic structure of lotus leaf, which built the hemispheroid that the radius is2mm, the spacing is8mm.The interaction between ten ridging shovels and the soil model respectivelymodeled for simulation analysis, using ANSYS finite element software. Researchedthe three-dimensional equivalent stress relationships of the interaction between the ridging shovels and the soil, the effect of different bionic structure ridging shovelviscosity reduction was comparative analysis. From the distribution of stress, themaximum stress of ridging shovel prototype appeared in the tip and stress distributeduniformly, but the maximum stress of the bionic ridging shovel appeared in the frontof the bionic trench and around the bionic convex hull, and around the bionic trenchand the bionic convex hull, a smaller stress area has also appeared, thus the bionicridging shovel to a certain extent, undermined the contact surface between the ridgingshovel and soil. Four types of bionic trench structure ridging shovel relative to ridgingshovel prototype had stress decreases, and bionic convex triangle and convex circulararc ridging shovel decreasing trend was more apparent among them. The areas ofhigher stress of the two types of bionic grooved ridging shovel were smaller thanbionic concave triangle and concave circular arc groove ridging shovel, and thedistribution of stress and size under the condition of three different parameter Settingstrend remained the same. Five types of bionic convex hull grooved ridging shovelrelative to ridging shovel prototype had the tendency of increase with the stress, thearea of higher stress was larger than that of the ridging shovel prototypes, and thedistribution of stress and size under the condition of three different parameter Settingstrend remained the same. Taken together, bionic convex triangle and convex circulararc trench ridging shovel relative to other types of bionic ridging shovel had moreapparent adhesion and resistance reduction effect among the nine kinds of bionicridging shovel.Selection of bionic convex triangle and convex circular arc groove ridging shoveland ridging shovel prototype conducted soil bin experiments indoor. The experimentcondition was include of the two kinds of different soil moisture content which was18.61%,20.9%and respectively in three ridging speed0.68m/s,0.87m/s,1.11m/s.Three types of ridging shovel in each ridging speed experimented three times, andthrough the BLR-1type sensor in real time to obtained ridging resistance data, thenintercepted the stability paragraph data to calculate the average and got the ridgingresistance on a ridging speed of this type ridging shovel though taking into thecalibration curve of sensor.①Under the conditions of that the moisture content of soil was18.61%and the ridging speed was0.68m/s, that the ridging shovel prototyperidging resistance of126.4N, the bionic convex triangle groove ridging shovel ridgingresistance of120.3N and the bionic convex circular arc grooved ridging shovelridging resistance of124.2N obtained. Under the conditions of that the same moisturecontent and the ridging speed was0.87m/s, that the ridging shovel prototype ridgingresistance of147.4N, the bionic convex triangle groove ridging shovel ridgingresistance of143N and the bionic convex circular arc grooved ridging shovel ridgingresistance of144.2N obtained. Under the conditions of that the same moisture contentand the ridging speed was1.11m/s, that the ridging shovel prototype ridgingresistance of174.9N, the bionic convex triangle groove ridging shovel ridgingresistance of168.5N and the bionic convex circular arc grooved ridging shovelridging resistance of171.4N obtained.②Under the conditions of that the moisturecontent of soil was20.9%and the ridging speed was0.68m/s, that the ridging shovelprototype ridging resistance of134.3N, the bionic convex triangle groove ridgingshovel ridging resistance of131N and the bionic convex circular arc grooved ridgingshovel ridging resistance of132.4N obtained. Under the conditions of that the samemoisture content and the ridging speed was0.87m/s, that the ridging shovel prototyperidging resistance of155.4N, the bionic convex triangle groove ridging shovel ridgingresistance of148.4N and the bionic convex circular arc grooved ridging shovelridging resistance of151.8N obtained. Under the conditions of that the same moisturecontent and the ridging speed was1.11m/s, that the ridging shovel prototype ridgingresistance of185.1N, the bionic convex triangle groove ridging shovel ridgingresistance of178.5N and the bionic convex circular arc grooved ridging shovelridging resistance of182.2N obtained. Comparative analyzed the ridging resistance ofthe three types of ridging shovel under the condition of different moisture content andspeed. That the ridging resistance of the ridging shovel increased with the increase ofridging speed, and also increased with the increase of moisture content obtained.Under the same moisture content condition, the average resistance reduction rate ofthe bionic convex triangle groove ridging shovel relative to the ridging shovelprototype in the three kinds of speed was3.65%and the bionic convex circular arc groove ridging shovel was1.85%. Bionic convex triangle groove ridging shovel hadmore significant adhesion and resistance reduction effect than bionic convex circulararc grooved ridging shovel.