Mechanism And Parameters Of Vertical Spiral Rice Deep-side Fertilizing Device

In this paper,according to the agronomic requirements of rice and deep-side fertilizing,developed by the vertical spiral rice deep-side fertilizing device,in order to improve the working reliability and distributing rice and deep-side fertilizing device components of platoon stability and uniformity distributing fertilizer consumption as the goal,on the basis of the use of theoretical analysis,numerical simulation and experimental research methods,such as the spiral distributing mechanism of distributing components and deep side fertilizing device driver key components structure reliability analysis and test study,has carried on the thorough theory research and exploration,to promote the rice planting "reduction,efficiency and increase production" technical measures and has a certain significance for the development of fully mechanized rice.1.Selected some representative fertilizer granules for rice deep-side fertilizing as the research object,and carried out experimental measurement and analysis of its physical and mechanical parameters,providing a basis for further analysis of fertilizer discharge mechanism and determination of numerical simulation parameters.2.The overall design of vertical spiral rice deep-side fertilizer machine was carried out.The design and analysis of the fertilizer discharging components of the vertical spiral rice deep-side fertilization device were carried out.Combined with the structural characteristics of matching rice transplanter,the driving system and driving mechanism of the deep-side fertilization device were analyzed and designed,and the driving structure of the power transmission link and the fertilizer discharge screw was determined.In order to ensure the reliability of driving structure design of side deep fertilization device,the reliability analysis of key components of driving structure of fertilizer discharge screw is carried out.By integrating the extreme response surface method,the decomposition-coordination idea and improve the weighted regression method,for multicomponent structure dynamic reliability analysis,An improved weighted regression distributed cooperative agent model method(IWRDCSMM)was established to solve the dynamic reliability analysis of the driving key components of the side-deep fertilization device.By using ANSYS software,the stress and deformation of key components of the driving structure are simulated and analyzed,and the factors that affect the stress and deformation of the driving gear are determined to be its rotational speed,density,elastic modulus and poisson’s ratio in order of importance.3.The quasi-fluid method was adopted to study the fertilizer particle flow,the contact mechanics model of fertilizer filling process was established,to determine the factors affecting of fertilizer filling performance,such as the Angle of repose,the friction coefficient of fertilizer particles to provides theoretical basis for structure design.Based on the plastic flow theory,the spiral distributing movement mechanism of the fertilizer particle flow are analyzed in theory,the fertilizer particle contact mechanics model is established,in-depth analysis of the fertilizer particle contact,the stress and displacement movement process,through the analytic method and center difference method of moment is deduced displacement analysis model,reveals the screw of the fertilizer particle flow distributing motion law.By using the numerical simulation method of particle flow quasi-fluid,equivalent viscosity coefficient of fertilizer particle flow was derived by experiment and theoretical analysis,using sliding mesh grid technology,using the fertilizer pseudothermal laminar fluid simulation analyses,tracked the 60 points fertilizer particle trajectory in the process of distributing,the development and change of the fertilizer particle flow field are analyzed,and the spiral movement law of fertilizer particle flow was verified.4.Single factor experimental study was carried out on the external diameter,rotational speed and travel speed of screw shaft.According to the results of single factor test,combined with the static evaluation of the stability index of fertilizer discharge and the dynamic evaluation of the uniformity index of fertilizer discharge.Two factors and five horizontal centers were adopted to design the combined test.The rotating speed and diameter of the spiral shaft were selected as the test factors,and the mean value and variation coefficient of fertilizer discharge s Tability were taken as the indexes.Three factors and five horizontal center combined test design scheme were adopted.The rotational speed,travel speed and diameter of spiral shaft were selected as the test factors.The average fertilizer discharge amount and variation coefficient of uniformity of fertilizer discharge were taken as the indexes for the experimental study.The regression equation between fertilizer discharge performance index and each factor was established and the primary and secondary relationship between each factor and fertilizer discharge performance index was analyzed.The regression equation of each performance index was used to establish the optimization model,and determine the optimal working parameters combination for screw shaft speed 190 r/min,screw axis 22 mm in diameter,speed 0.45 m/s.The test results showed that the fertilizer discharge performance index met the requirements.Through laboratory and field experiments,it was verified that the performance index of the whole machine met the agronomic requirements of rice lateral deep fertilization.