The Design And Research Of Highland Clearance Field Management Machine

Field mechanization is always an emphasis in the process of the development of agricultural mechanization in China, but some field work in our country has a low mechanization degree, which basically still use the traditional way of manual work with low production efficiency great labor intensity, which is incompatible with with the progress of modern agricultural production. The low mechanization degree of field work has been the restricting bottle neck in improving the technology of whole agricultural mechanization. In this paper, a new field management machine is researched for the requirements of management machine, which based on agricultural mechanics, the theory of tractor, the theory of mechanism, etc. and the mechanical optimization design, computer simulation Simulink, finite element method, etc. The main results are as follows:(1)According to the requirements of agricultural, agronomic and the existing machine, the overall scheme of the machine was determined, which completed the stability and the design of hydrostatic drive system.(2)Mathematics model of kinematics and dynamics of clearance adjustment mechanism was set up, and there are kinematics simulation and dynamics simulation for clearance adjusting mechanism. The Kinematics emulation obtained the time-variant process of displacement, velocity and acceleration of measure points’. The results show that the adjustable range of ground clearance is 644.15～1443.66 mm, the adjustable height is 799.51mm, which greatly achieve the design purpose. The Kinematics emulation obtained the time-variant process of hinge joint counteractive and found out the maximum counteractive of hinge joints. With the structural design for the mechanism, the finite element analysis for key components by ANSYS software, the analysis results are the maximum stress of footstock is 122.05MPa, the maximum deformation is 0.043mm, the maximum stress of driving wheel connection weldment is 186.22MPa and the maximum displacement is 5.5371mm. Those results are less than the material yield strength 235MPa which means the structure design is reasonable.(3)Statics finite element analysis for the frame of mechanization of field was taken by ANSYS software. The finite element model of the frame was established, the load and boundary conditions of the frame were determined. According to the adjustability of the frame, we analyzed how the stress and displacement of frame changed when its in the bending mode, the reverses operating mode, the braking condition and the abrupt-turning condition with the wheelbase under 1360 mm and 2000 mm. The results show that: when the wheel track is 1360mm, in bending condition, reverse condition,braking condition and sharp turning condition the maximum stress of frame is 66.551MPa,72.088MPa,75.395MP and 175.79MPa ,respectively. The maximum displacement is 2.3779mm,3.4077mm,1.7171mm and 3.8517mm, respectively. when the wheel track is 2000mm, in bending condition, reverse condition,braking condition and sharp turning condition the maximum stress of frame is 70.861MPa,81.536MPa,80.593MPa and 176.77MPa ,respectively. The maximum displacement is3.2927mm,5.7221mm,2.4959mm and 4.4675mm., respectively. The strength of the frame in four operating conditions under two kinds of wheel tread are less than the allowable stress 230MPa that indicate frame structure design is reasonable.