| Xinjiang is China’s high-quality agricultural products planting base,the arable land area is vast,soil ploughing can effectively increase the oxygen in the soil,reduce weed and pest,very important for the planting and growth of agricultural products.In response to the 1LF-460 turning plough used in Xinjiang at this stage,there are problems such as high resistance when ploughing in some soils,easy destruction of the plough tool structure and low working efficiency.The design and optimisation of the 1LF-460 hydraulic amplitude control plough is based on theoretical analysis,discrete element analysis and finite element analysis.The research is based on the optimisation of the plough body surface,the plough frame and components such as the plough body safety protection device,the improvement of the depth wheel,the suspension and the turning cylinder,and the field test of the prototype to check its performance and increase the efficiency of the plough to ensure the stability of the plough.The main research elements of this paper are as follows.(1)To design and optimise the surface parameters of the plough body and to establish a soil model using EDEM discrete element analysis to obtain the relationship between surface parameters and resistance to movement.The relationship between the surface parameters and the resistance to movement was obtained by using EDEM discrete element analysis to build a model of the soil.The relationship was found to be less when the ploughshare installation angle was 28.12°,the metric angle was 39.8° and the tangential angle between the two ends of the guide curve was 107.92° in a loamy soil environment,and field tests were conducted to reduce the vertical resistance of the plough by 4.37% and the horizontal resistance by 3.06% compared to the pre-optimisation period.(2)An automatic lifting and return mechanism was designed to avoid obstacles.The length of the upper and lower linkages is 700 mm,the horizontal spacing between the bolt sleeve is 60 mm,the spacing between the bolt sleeve and the upper linkage is 70 mm,the diameter of the bolt and the slide block is 86 mm,and the upper and lower linkages are fitted together with a spring.The kinematic analysis of each part of the process is within the safe range of its structural strength.It can effectively improve the efficiency and stability of the turning plough.(3)Simulation of the plough frame under two working conditions for static analysis,to obtain the strength of the plough frame material to meet the working needs under ideal conditions and when the obstacle avoidance protection mechanism is triggered.The results of the modal analysis show that the plough frame will not be damaged by resonance during operation and that the frame meets the operational requirements.(4)Field tests were carried out on the prototype,which was divided into two working conditions: ploughing width of 160 cm and ploughing width of 240 cm.The coefficient of variation of ploughing depth was 3.9%,the coefficient of variation of ploughing width was 1.2%-1.8%,the stubble coverage rate on the surface was 92.8%,and the stubble coverage rate at a depth of 8 cm or less was 83.3%,all the working indexes were better than the 1LF-460 tiller plough used at this stage,and the optimisation was reasonable. |
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