Bionic Walking-wheel Design And The Study On Terrain Mechanical Model

Jiangxi Province is a big rice planting province in China whose rice planting area ranks in the forefront of the country.The mechanization level of rice planting is an important factor affecting rice yield.Therefore,improving the mechanization level of paddy field operation is conducive to improving rice yield and enhancing industrial competitiveness.The main power machinery for ploughing of small plots in paddy fields such as hills in China is mainly micro-tiller.When the conventional micro-tiller wheel travels and works on the surface of paddy fields,due to the slipping and serious subsidence of the vehicle,the adhesion is small and the driving resistance is large,which leads the problems such as poor passability,low efficiency,high energy consumption and inability to travel.Wheel is an important component of the micro-tiller,which directly affects the use and operation efficiency of the micro-tiller.The design of a reasonable wheel is conducive to reducing slipping and driving resistance,saving fuel and improving operation efficiency when the micro-tiller walks in paddy fields.The ability of organisms to adapt to complex environmental changes in nature provides important inspiration for the design of wheels.Therefore,this paper aims to design a bionic walking wheel with high passing ability,and studies the interaction between the conventional iron blade wheel,bionic walking wheel of micro-tiller and paddy soil when walking on the paddy surface.The main contents of this paper is to design a bionic walking wheel combined with the principle of bionic engineering.After soil sampling,the basic soil physical parameters such as particle size distribution,specific gravity,liquid limit and plastic limit are obtained by soil physical parameters test.Then a simple soil mechanical parameters measuring equipment was designed to measure the parameters of pressure characteristic,rheological properties and shear properties of cohesive soil near the water content of 34%(the difference is less than 1%).On the other hand,in order to facilitate the study of wheel-soil interaction,an indoor single-wheel soil test bin was designed,and the passing test of the conventional iron blade wheel of the micro tillage machine was carried out on this basis.Based on the test data and the traditional mechanical model,the drawbar pull model of the wheel was derived,which can better describe the relationship between the drawbar pull and soil parameters,wheel load and slip rate.In order to verify the applicability of the model in the field,a test bench was set up in the field and the model verification test of the iron blade wheel was carried out.The results showed that the drawbar pull model was still applicable although the outdoor soil performance had changed.At the same time,the passing performance of the designed bionic walking wheel is compared with that of the conventional iron blade wheel.The data shows that the bionic walking wheel can greatly improve the passing performance when walking in the field.This study can provide a certain reference for the design of highpassability agricultural machinery walking mechanism.