| Compared with solid fertilizers, applying liquid fertilizer could increase the fertilizer utilization efficiency and at the same time achieve pretty good economic and ecological benefits. In deep fertilization, fertilizers could be concentrated near the regions of plant roots located in cultivating layer, meanwhile, deep-fertilization could make plant roots grow downward, increase the amount of plant roots, increase the capacity of assimilating nutriments and water and crop yield notably, and reduce the loss of fertilizer fertilized on the earth surface. In the domestic market, there is still no popularization application of liquid fertilizer applicator, especially applicator for deep-fertilization, meanwhile, the technology for deep-fertilization is still in the rough. Therefore, it has great realistic significance.This paper analyzed the present situation of application and development prospect of liquid fertilizer and liquid-fertilizer applicators based on collecting massive literature. At this stage1YJ-140type deep-fertilization liquid fertilizer applicator with planetary elliptic gears has two problems that the serious jam of spraying needle and the serious volatilizing of liquid fertilizer because of bigger hole. So this paper proposes a method of reverse design and analysis of kinematics simulation based on MATLAB GUI platform. The chief contents are as follows:(1)The non-circular planetary gear trains pricking hole mechanism was proposed. Several date points on the motion trace of spraying needle tip were selected, and then the cure fitting technique of cubic non-uniform B-spline was applied to control and ascertain the whole trace curve. On this basis, the inverse kinematics model of the pricking hole mechanism was established. Then, other parameters can be reversed easily.(2)The inverse design and kinematics simulation software for this pricking hole mechanism was compiled based on the development platform of MATLAB GUI, then by using the software and making the new methods of ensuring the verticality of spraying needle tip and the size of holes as the target, a group of mechanical parameters were obtained.(3)Coordinates files of seven non-circular gear pitch cure was get though the data export functions of the software. By using the tooth profile generation software, the non-circular gear tooth profile were worked out. The optimal tooth profile was worked out by removing noise smoothing. Finally, the seven non-circular gear models were drew by the3D modeling software pro/E. (4)Structural design was conducted based on the optimized parameters of the Pricking hole mechanism with planetary non-circular gear for deep-fertilization liquid fertilizer applicator.3D model and virtual prototype of this pricking hole mechanism was established to conduct mechanism kinematics simulation, and then the comparison of the simulation results and theoretical computing results was made to verify the correctness of the kinematics model and the analysis results of this pricking hole mechanism.(5)The test-bed of the pricking hole mechanism with planetary non-circular gears was developed to test the trajectory and velocity of the spraying needle tip through high-speed camera test. And the comparison of the test results and theoretical analysis results was made to show that the test results including static trajectory shape, relative speed curve shape and peak value of the spraying needle tip of this pricking hole mechanism were basically accordant with theoretical analysis results. It verified the correctness of theoretical model and kinematics analysis of this pricking hole mechanism. And by the repeated pricking hole test the measured hole diameter and hole size can satisfy the basic requirement of the theoretical design. It verified the correctness of theoretical model and kinematics analysis of this pricking hole mechanism once more. And it verified the feasibility of this pricking hole mechanism on the actual deep-fertilization. |
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