Design And Experimental Study Of Biomimetic Deep Loose Shovel Based On Discrete Element Method

Long-term rolling of tillage tools is easy to form a hard plow bottom,which in turn affects the growth and yield of crops.Deep pine operation can loosen the soil,improve the structure of the tillage layer,enhance the water storage and moisture retention of the soil and the ability of drought and waterlogging,and is often used to break the bottom layer of the plough and improve the crop growth environment.However,the existing deep loose operation generally has problems such as large traction resistance and low operation efficiency.In this paper,using Monopterus albus as the bionic prototype,the head features of Monopterus albus were extracted and fitted based on MATLAB image processing and reverse engineering technology,and applied to the design of the tip of the bionic deep pine shovel,and the drag reduction mechanism of the bionic deep loose shovel was revealed through discrete element simulation analysis.The research of bionic deep loose shovel is helpful to solve the problems of high resistance and high energy consumption of touching parts,implement cultivated land protection methods,and ensure China’s food security,and it also provides research ideas and design basis for the bionic application of agricultural machinery drag reduction.The specific research content and conclusions of this paper are as follows:(1)Structural design of bionic subsoiler.Determine the Monopterus albusas a bionic object;Image processing technology and reverse engineering technology were used to extract and fit the top-down and side-view features of the Monopterus albus ’head,respectively;Based on the curve design and surface reconstruction technology of the fitted equation,the bionic deep loose shovel shape was constructed.(2)Discrete element analysis of bionic deep loose shovel.Discrete element simulation EDEM was used to simulate the numerical operation of deep loosening shovel to obtain the numerical changes of tillage resistance under the conditions of working speed of 0.8 m/s,1.0 m/s,1.2m/s and depth of 300 mm,350 mm and 400 mm,and the influence of operation speed and depth on the resistance of deep loose shovel was explored by two-factor analysis.By analyzing the influence of bionic deep loose shovel shape and soil disturbance on drag reduction,the mechanism of bionic deep loose shovel drag reduction operation was revealed.(3)Finite element analysis of bionic deep loose shovel.The strength check of the bionic deep loose shovel was performed using finite element analysis ANSYS.From the stress analysis,it is known that the concentration of each shovel tip can meet the yield strength and use requirements of 65 Mn steel,and the design strength of the bionic deep loose shovel tip meets the requirements.(4)Soil trough test of bionic deep loose shovel.Manufacture of bionic deep loose shovels and frames,and build soil trough test devices;The moisture content and compactness of soil were determined,the resistance changes of bionic deep loose shovels at different deep loosening speeds and depths were obtained,and the consistency of discrete element simulation and soil trough test results was explored.