| Due to the continuous shallow farming and reusing of small farm machinery in dryland agricultural production,the effective tillage of the soil and the thickening of the plow bottom have resulted in the deterioration of the physical and chemical properties of the soil and the decline of the soil,resulting in the drought,soil and water loss and the decrease of soil nutrients,which seriously restricts the productivity of agricultural crops.The western region of Liaoning province(Western Liaoning brown soil area)has low annual precipitation,high evaporation and severe soil drought,which results in fewer tillage machines suitable for this area,and the existing joint operating machines can not meet the needs of operation fundamentally.Therefore,in order to meet the cultivation model of the region,improve the utilization of natural precipitation and improve the water storage capacity of the soil,it is very important to study the joint operating machine in this area.This paper combines the research project of public welfare industry(project number: 201503116-09).In view of the research of the Western brown soil area in the western Liaoning Province,a combination of deep loosening and stubble ridge tillage ridging and ridging machine is designed.The dynamic analysis and finite element analysis of the key components are carried out,and three factors and five levels of two regression are carried out.The main results and conclusions of this study are as follows:(1)through the in-depth analysis of the current research status of the joint operating machines at home and abroad,combined with the operating characteristics of the existing joint operating machines in China,a combination of deep pine and stubble rotary tillage ridge raising and ridging machine is studied in the light of the ridge farming in the brown soil area of western Liaoning.The machine can complete subsoiling,stubble removal,rotary tillage,ridging and repressing operations at once,so that the soil environment can be well sowed.The design of the key components is completed,and the 3D modeling and Simulation of the key components are carried out.(2)the Solidworks and CAD software were used to design the rotary tillage ridging and ridging machine for deep loosening and stubble,and on the basis of the mechanism analysis of the key components,the furrow parts were deeply studied,the formation principle of the ridge working surface was studied,and the best parameters and the structure were determined.(3)the finite element analysis of the deep loosening shovel and stubble rotary tillage shaft is carried out by ANSYS software.The maximum stress of the slack shovel handle is 245.38 MPa,less than the yield limit stress of the material,the maximum strain is 0.001 mm,and the maximum total displacement is 0.38 mm.The modal analysis of the stubble rotary tiller axis shows that the natural frequency increases with the increase of the order,the natural frequency range is 77.32~421.00 Hz,the frequency range of the cutter shaft is 35~45 Hz,and the resonance of the vibration modes will not be produced.(4)on the basis of the test preparation of soil moisture content and firmness in the brown soil area of western Liaoning Province,the maximum distance and the working resistance of the soil are taken as the test indexes,and the three factors and five levels of the five level regression orthogonal combination test are carried out with the speed of the machine,the depth of the soil and the straw mulching as the factors.The experimental results show that the optimum working parameters are as follows: the speed of the machine tools is 1.14 m/s,the depth of the soil is 20.21 cm,the straw mulching is 0.35 kg/m2,the maximum distance of the soil throwing is 29.09 cm,and the working resistance is 12.05 kN. |
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