Commuting Characteristics Of Horizontally Reversible Plough Under High-Speed Tillage Conditions

1LB-240 Horizontally Reversible Plow(HRP),developed by Xin-Jiang Agricultural Mechanization Institute of China,has 2.8m length,2.5m width and 1.2m height,is a novel mouldboard plough with excellent operation performances(such as steady tilling and orderly soil cutting).Compared with the regular mouldboard plough,the distinguished advantage of HRP is that it can perform a continuous and alternative commuting tillage.Therefore,HRP has much higher plough efficiencies than the other mouldboard plough.Unfortunately,however,Interference check technique(ICT)based results validated that there exist model errors in the constructed 3D HRP structure.The foregoing model errors include that the geometric interferences occur at reversing mechanism,and that some parts of landside section,e.g.,cylindrical pins are missing.These model errors surely have sufficiently adverse effects on HRP design improvement.In addition,the plough-surface is an important part of plow tillage,in the commuting tillage process of HRP,clods to the side turning over the soil,which it need of mouldboard plough to commuting operations.However,recent experiment evidences indicate both plow shank and share are relatively serious wear in the tillage process.In view of the two cases,first,in this paper an improved design to refine the three dimensional(3D)model of HRP is implemented by using Virtual assembly technology(VAT).To achieve this,the authors propose a combined virtual assembly semantics and constraint for assembly planning and simulation of HRP in the commercial software,e.g.,SolidWorks.To build the new parts by the virtual assembly technology of plough for reassembly,and the assembly simulation of HRP verified through ICT again.The results demonstrate that not any model error exists in the refined 3D HRP model any longer and that semantics and constraint-based VAT can support the interactive operation more effectively and accurately than those with geometric constraints.Secondly,as for the fact that relatively serious wear occur on both plow shank and share in the tillage process problem,based on our previously related work,this section further focuses on effects of Hydraulic Cylinder(HC)movements during tillage on ploughshare and plough-breast.A combined finite element method(FEM)and multi-body dynamics analysis(MDA)was implemented to assess both tillage kinematics and kinetics of the ploughshare and plough-breast.Our findings demonstrate that the various movements of HC cannot have an adverse effect on the service life of the ploughshare and plough-breast though they result in the maximum stress and strain at the share-point and plough-breast.Finally,A combined FEA and MDA was used for the analysis of the plough resistance during HRP tillage,first of all,The theoretical method on the ploughing resistance was introduced,these numerical predictions primarily covered four different tillage speed and three different operating depth,respectively,where loading data due to the plough movement were obtained from an MDA and applied to load a finite element modal of the ploughshare or plough-breast.Our result show that the importance of performing MDA as a preliminary step FEA to obtain an insight into the actual stress and strain variations at the share-point and plough-breast.Our findings demonstrate that the ploughing resistance is increased with either operating depth or tillage speed.This generally results in the severe wear on the plough surface of HRP,i.e.on either ploughshare or plough-breast.