Research On The Impact Of High-speed Plough Structure And Working Parameters On Tillage Resistance

Land tillage plays an important role in agricultural production.As the core component of ploughing operation,the quality of the plow body directly affects the quality of work and the amount of energy consumed.The plow-type plough has also been developing in the direction of high-speed operation.When the tractor operates at a speed of 8km / h-10 km / h,it can not only exert the economic benefits of tractor fuel,but also achieve good operating quality,but the plough body Large farming resistance and high energy consumption have also been problems.To this end,in order to optimize the structure of the plow and reduce the tillage resistance,this paper uses the discrete element method and field experiments to conduct research on the process of the plow.The specific research content and conclusions are as follows:(1)Analyze the working principle of the plow body,determine the structural parameters of the high-speed plow body,establish the mathematical model of the plow body,and establish the high-speed plow body model through Solidworks 3D software.(2)The discrete element plow-soil model was established.The field soil parameters are calibrated and the relevant literature is referenced to determine the soil related parameters.Based on the soil structure,a three-layer discrete element soil model is established,which is the cultivation layer,the plough layer and the core soil layer.Import the plough model into the EDEM software,establish the plough-soil model,set the appropriate parameters,and complete the establishment of the simulation model.(3)Discrete element simulation test.In the simulation test,the plow body structure parameters such as the installation angle of the ploughshare,the bulldozing angle,and the tangent angle between the ends of the guide curve are used as test factors,and the horizontal resistance and vertical resistance are used as test indicators.Analysis of the results shows that the order of significance of different factors on the horizontal resistance is: tangent angle,plowshare installation angle,and bulldozing angle at the ends of the guide curve;the order of significance of different factors on the vertical resistance is: guide curve Tangent angle,bulldozing angle,plowshare installation angle at both ends.(4)Optimization Results.The best combination of structural parameters: when the plowshare installation angle is 27.76°,the bulldozing angle is 39.3°,and the tangent angle between the two ends of the guide curve is 108.42°,the horizontal resistance is 8406.96 N,the vertical resistance is 3370.49 N,and the horizontal resistance is greater than the vertical resistance.A new plow body model is established with the optimal combination of structural parameters,and the experimental study of working parameters on tillage resistance is carried out.The effect of speed is significantly greater than the depth of ploughing.Under certain conditions of ploughing depth,horizontal resistance increases with speed.When the depth ofcultivation is at a lower level,the vertical resistance decreases first and then increases as the speed increases.When it is at a higher level,the vertical resistance increases with the increase of speed.(5)Comparative analysis of field test and simulation test.In the horizontal direction,the combined force and working resistance of the high-speed plow increase with the increase of speed,and the minimum is when the ploughing depth is 255 mm and the operating speed is8km/h;in the vertical direction,when the ploughing depth is between 255 mm and 280 mm,the high speed The combined force and working resistance of the plow decrease first and then increase as the speed increases.When the ploughing depth is 305 mm,the vertical resistance increases with the speed;when the ploughing depth is 280 mm,the operating speed is 9km/h It works best under conditions.Under certain conditions of ploughing depth,the changes of horizontal resistance and vertical resistance of the high-speed plow with the speed in the simulation test are consistent with those in the field test.The results show that the discrete element method is reliable for the simulation and analysis of high-speed plow working resistance,and the best working parameter combination is a ploughing depth of 280 mm and a ploughing speed of 9 km/h.