Optimization Design And Experiment Of Organic Fertilizer Side Throwing Auxiliary Mechanism

One of the representatives of the side throwing fertilizer spreader is the side throwing machine of organic fertilizer with inclined opposite disc designed by our team.The team has completed the whole device design by theoretical analysis,virtual simulation,prototype experiment and other means in the early stage,and carried out in-depth research on its core throwing component and achieved good throwing effect.Due to the special working principle of the device,there are many corrections and adjustments in the direction and path of the organic fertilizer jet in the process of ejection.Therefore,it is necessary to configure the auxiliary mechanism(assisted roller,baffle plate,guide plate)on the basis of the good main jet to correct the overall ejecting flow to a narrow,far,and uniform ideal state.However,it has not been studied in depth,and the potential of auxiliary operation needs to be brought into full play,and there are still problems of fertilizer accumulation and local ridging in the near area.In order to solve the above problems,this paper will conduct indepth research on the auxiliary mechanism.The main contents are as follows :(1)According to the existing experimental data,prototype experiment and virtual simulation results,combined with the function and principle of each component of the side throwing device,the existing problems of the auxiliary mechanism are analyzed,and the direction of improvement and optimization is obtained,and the research ideas and methods are clarified.(2)On the basis of theoretical analysis,a symmetrical spiral blade roller is innovated,and the key structural parameters and operation parameters are optimized,and the spatial position relationship between the roller and the disc of the main throwing part is clarified.The single factor and response surface simulation experiments were carried out by using EDEM software.The effects of roller speed,spiral angle and blade number on the uniformity coefficient of variation and the proportion of fertilizer within 1m were studied.The optimal parameter combination was obtained after optimization,and the simulation results of this parameter combination were better than those of the original roller.(3)By constructing the mechanical model of the fertilizer particles on the surface of the scraper,the absolute velocity of the particles from the surface of the scraper is obtained.Based on this,the motion path of the affected fertilizer particles is analyzed.Combined with the action and working principle of the deflector,the surface is redesigned according to the trajectory of the fertilizer particles.The two-stage variable curvature arc is used to correct the fertilizer movement path twice,and the two sides of the guide plate are bent down to prevent the fertilizer from spreading to both sides.Finally,the spatial position relationship and installation form of the disc are clarified.(4)Starting from the flexible barrel cavity generated during the working process of the side throwing device,the principle of its action is analyzed,and the coordination effect between the baffle plate and the barrel cavity is analyzed around the main control and dragging fertilizer.The motion characteristics of the dragging fertilizer are emphatically expounded.According to this characteristic,the baffle plate is improved by combining the action and working principle of the baffle plate,and the structure and parameters of the baffle plate are clarified.(5)After the optimization of the auxiliary mechanism is completed,the side-throwing device model is integrated,and the EDEM software is used to test the optimization effect of the auxiliary mechanism in the form of fixed points.The simulation results show that the uniformity coefficient of variation of the auxiliary mechanism with the main throwing disc to correct the overall projectile is reduced from 28.76 % to 21.55 %,and the effective throwing distance is increased from 10.1 m to 11.7 m.(6)The prototype test results show that the two forms of throwing before and after the optimization of the auxiliary mechanism are obviously compared,and the optimization effect is good.The test results of the innovative design of the throwing roller are that the uniformity coefficient of variation is 25.46 %,and the proportion of fertilizer within 1 m is 25.65 %,which is greatly improved compared with the original roller 46.77 % and 65.94 %.When combined with the main plate,the throwing uniformity is good,and there is no accumulation and ridging phenomenon.After the guide plate is corrected,the throwing angle of the main projectile flow is about 27 °,and the blocking and transferring fertilizer effect of the baffle plate is good.The uniformity coefficient of variation decreases from 25.95 % to 19.21 % during mobile operation.The effective throwing distance increased from 10.1 m to 11.2 m.The research shows that the optimized auxiliary mechanism has a good coordination effect with the main throwing component,and the throwing performance is greatly improved under the combined action with the main disk.The auxiliary mechanism has completed the last important technical link for the actual transformation of the side throwing device,and provides useful ideas and methods for the analysis and solution of similar problems.