The Experiment And Analysis Of Paddy Field Deep Fertilizing Device Based On Discrete Element Method

Fertilizer deep applying technology can effectively improve the rice yield, reduce the fertilizer loss and pollution of the environment. Fertilizer overhead, compaction prone to deep fertilization in paddy field, caused by the blockage effect of fertilizer, fertilizer quality. To master the flow law of fertilizer in the fertilizer in paddy field can contribute to deep fertilizing device has reasonable design, high efficiency. Agricultural fertilizer granules are granular materials, the discrete element method is an important method to study the granular stress, sports and other aspects, this paper uses the discrete element method was used to study the movement of fertilizer in paddy field in the process of deep fertilizing device.According to the discrete element method to calculate the requirement of large granule urea fertilizer in paddy field, with the deep application of fertilizer as the research object, analyzes the physical and mechanical properties test of fertilizer, fertilizer particle discrete element model has been established for paddy field; deep fertilizing device for discrete element boundary model, and determine the boundary contact type. The movement process of different working state simulation of granular fertilizer in paddy fields under deep fertilizing device. By means of high speed camera movement patterns of fertilizer in the deep fertilizing device, the test results and the simulation results are compared and analyzed. The main research work is as follows:(1) the physical and mechanical characteristics test of basic physical size of three axes, equivalent diameter, spherical rate, density and other parameters of fertilizer granules were measured; the elastic modulus, the fertilizer particle friction coefficient, friction coefficient, coefficient of restitution and analyzes their main influence factors, which can provide reference for particle simulation analysis.(2) calibration parameters by the simulation and experiment of influence, through analyzing the relationship between the spherical particles and manual fill irregular spherical particles of the angle of repose and different parameters, verify the validity of the single particle fertilizer parameter measurement of particles motion simulation modeling. The comprehensive efficiency of simulation, the discrete element model of granular fertilizer.(3) is mounted on a paddy field deep fertilizing device for spiral steel wire as disturbance component as the research object, designed the fertilizer box, a simplified structure for simulation test, to determine the motion parameters and material properties of the fertilizer box, a discrete element analysis of solid boundary model of paddy field deep fertilizing device. Calculation method between the particles and the deep fertilizing device for model selection, the contact between the particles.(4) the simulation analysis in the simulation of the effect of fertilizer has no rotation fertilization process of spiral steel wire under the condition of structural parameters of spiral steel wire and the fertilizer effects on the fertilizer box, a fertilizer box opening diameter of the simulation of the fertilizer box. To observe the morphology of particles in the flow of fertilizer under different working conditions, and analyzes the influence of different structure of granular flow.(5) by using a high-speed video camera technology on the fertilizer particle motion process of discriminant analysis. The results of the simulation results are compared with the experimental analysis, proved the feasibility and rationality of the calculation analysis of granular fertilizer fertilizer granules and fertilizing device mechanical parts in contact with the discrete element method to select parameters, a new method for the design of the fertilizer particle modeling, paddy deep fertilizing device.