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Study on Working Principle and Experiment of Work Components of Liquid Fertilizer Injection Type

Author: HeJianNan
Tutor: WangJinWu
School: Northeast Agricultural University
Course: Mechanization of agriculture
Keywords: Deep-fertilization Liquid fertilizer Pricking hole mechanism Distributor Design Optimization Simulation Experiment
CLC: S224.21
Type: Master's thesis
Year: 2013
Downloads: 24
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Abstract


Liquid fertilizer not only has high utilization rate and convenient to use, but also has smallpollution to the environment and easy to produce and transport. Depth of fertilizer in the soil nearthe roots of crops, can attract the crop roots grow deep into the soil, increase the crops’ ability oflodging resistance and drought resistance, to improve crop yield; At the same time can reducevolatilization and loss of fertilizer, effectively preventing pollution of the environment. Liquidfertilizer deep application is an important means of liquid fertilizer application which integration ofthe many advantages of liquid fertilizer and deep application technology. But now the research ofmachinery and technology which can be used to liquid fertilizer deep application at home andabroad is very few, and actively carry out relevant research has important practical significance.The design of deep-fertilization liquid fertilizer applicator is carried out in this case.This study consult a large amount of relevant literature, and analysing of the developmenttrends and existing problems of liquid fertilizer applicator at home and abroad. According toresearch needs, it starts with describing the structure and working principle of liquid fertilizerapplicator’s key components pricking hole mechanism and distributor in detail, In order to make afurther exploration on working mechanism, this study associates with the theoretical analysis,computer optimization and simulation and experimental study. Then set up and optimize fertilizerapplicator and carry on the related test at the same time after determine the key components arefeasible. The research is mainly carried out the following work:（1）The theoretical kinematics and dynamics analysis of planetary pricking hole mechanismwith congruent elliptic gears and the establishing of its mathematical model can provide aconvenient for programming the pricking hole mechanism’s kinematics and dynamics optimizationprogram, also lay the theoretical foundation for its further research and improvement.（2）The distributor’s structure had been improved and its working principle has beenexplained too. The distributor cam’s optimization program had been wrote to ensure thesynchronization of pricking hole mechanism and distributor in the work. We can input the relatedparameters to determine the cam’s push-way movement angle, far off-angle, return movementangle and near off-angle, and get the cam’s profile curve, pressure angle curve and curvature radiuscurve to verify the pressure angle and curvature radius.（3）In order to obtain the spray fertilizer needle tip point’s relative movement trajectory,absolute movement trajectory and displacement curve, speed curve and acceleration curve in therelative motion to have a more in-depth analysis for pricking hole mechanism, we have built its3D model and carry on the kinematics simulation for it.（4）This paper carried on the kinematics and dynamics simulation for the3D model ofdistributor to explore the movement rule of valve core and the stress of the valve core and the cam.The results show that the velocity and acceleration of valve core not mutation, and its law ofmotion is sinusoidal acceleration motion law, it is same with the theoretical analysis.（5）The pricking hole test and spraying fertilizer test were taken on the test bench, as toexplore the influence of forward speed of test bench and rotating rate of planetary frame to the holedistance and the width of the hole, and liquid pump stress and rotating rate of planetary frame to thefertilizer volume. Processing and analyzing the test data with Design-Expert6.0.1software, withagronomic requirements as constraint conditions, the multi-objective optimization method isadopted to optimize the model, and the best combination of factors satisfied the performance indexwas found.（6）After designing the four ridges job deep-fertilization liquid fertilizer applicator and takingfield experiment, the test data should be handled by the Design-Expert6.0.1software, the same timewe can get the change curve of hole distance and width of the hole with the rotating rate ofplanetary frame and fertilizer volume with liquid pump stress and rotating rate of planetary frame.Then, we compare them with the bench test. The results showed that the change trend ofcorresponding curve is consistent and the operation effect of machine is wonderful.

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CLC: > Agricultural Sciences > Agricultural Engineering > Agricultural machinery and implements > Field management machinery > Fertilizer machinery > Liquid fertilizers,powder,granular fertilizer,fertilizer equipment
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