Optimization Design And Experiment Of Reducing Viscosity And Resistance Of Plow Wall Of Hydraulic Overturning Plow

Hydraulic tilting plough is the most widely used soil tilting machine,but in silty farmland,the soil adhesion on the plough wall is serious,which leads to the cultivation resistance and other problems become the main problems restricting the development at present.Therefore,aiming at the above problems,this paper designs plough body surface based on horizontal straight element method,and carries on discontinuous design to it.A discrete element simulation model was established for silty soil in Shihezi region of Xinjiang ,and the structural design parameters of plough-wall were optimized by discrete element simulation test.The adhesion amount,tillage resistance and tillage quality of optimized plough-body were compared with those before optimization in field test.The main contents and conclusions are as follows:(1)Determination of soil material parameters.In this study,the adhesive soil in Shihezi area was taken as the research object,and the material parameters of the soil and the contact parameters between the soil and 65 Mn were measured,mainly including: Soil particle size,density,moisture content,solidity,shear strength,static friction coefficient of soil-65 Mn,slope rolling distance of soil-65 Mn,and accumulation Angle provide reference for subsequent discrete element simulation parameter test of plough body.(2)Based on the horizontal straight element method,the plough wall suitable for the current operating conditions is designed,and the non-continuous and non-smooth optimization design of the plough wall is carried out to analyze the force of the plough wall.(3)Calibration of soil discrete element model and discrete element simulation optimization of plow wall structural parameters.Taking soil-65 Mn and soil-65 Mn recovery coefficient,static friction coefficient,dynamic friction coefficient and JKR surface energy factors respectively,and taking rolling distance,stacking Angle,cohesion and internal friction Angle as indexes,the optimized soil-65 Mn contact parameters are: recovery coefficient 0.51,static friction coefficient 0.56,dynamic friction coefficient 0.08,JKR surface energy 4.12.Soil-soil contact parameters are: recovery coefficient 0.57,static friction coefficient 0.65,dynamic friction coefficient 0.23,JKR surface energy 4.49.Structure optimization simulation test is divided into the single factor test and multifactor orthogonal test,single factor experiment with the opening of the guide curve,it be Angle,yuan line Angle variation,hollow out than,wing edge Angle for the factors,soil adhesive capacity and horizontal moving accuracy as the index,determine the opening of the guide curve,it be Angle,yuan line Angle variation,hollow out than the optimization of the Angle,wing edges are: 233mm～405mm,3°～13°,10°～20°,0.23,37.5°.Based on the orthogonal test of three factors and three levels,the results show that the opening of guide curve,the Angle of draft and the Angle of element line have significant effects on soil adhesion.The optimized structural parameters include:opening of guide curve 259.16 mm,drawing Angle 12.89°,variation of element Angle 10.75°,hollow ratio 0.23 ° and Angle of wing edge 37.5°.Under the optimized parameters,the adhesion capacity of plough body is 9.07 kg.(4)Field validation test.Field experiments were carried out to verify the viscosity reduction and drag reduction rates of the optimized plough compared with the optimized plough and the tillage quality.The results showed that compared with the optimized plough,the viscosity reduction rate and drag reduction rate of the optimized plough were 33.12% and 4.32%,and there was no significant difference in the tillage quality.The stability of tillage depth,tillage width,vegetation and stubble coverage rate and soil fragmentation rate of the optimized plough were all at a high level.