Design And Experiment Of Mechanical Flip Unloading And Screening For Black Soldier Flies Frass

The way of black soldier flies(Hermetia illucens L.)to biotransform food waste is an efficient and environmentally friendly treatment method.However,the mechanization degree of its production process is low,which affects the efficient use of food waste.In this paper,a mechanical flip unloading and screening device is designed,which is used to unload,transport and screen the black soldier fly frass formed by the biotransformation of food waste by black soldier flies.The main research contents are as follows:(1)To measure and calibrate the physical parameters and contact parameters of the organic fertilizer of black soldier flies frass.A simulation model of organic fertilizer granules was established using the principle of contact model(Hertz-Mindlin with JKR).Through the "virtual calibration" and experimental measurement of the stacking angle,the average stacking angle of the simulation test is 41.06°,and the relative error with the average stacking angle of the physical test is 1.94%.The simulation parameters of organic fertilizer granules were determined,which provided data support for subsequent simulation experiments.(2)Structural design of the mechanical flip unloading and screening device for black soldier fly frass.According to the process analysis of the unloading and screening of black soldier fly frass,the overall scheme of the mechanical flip unloading and screening device for black soldier fly frass is proposed,the structure and working principle of the device are expounded,and the structural parameters of the mechanical flip unloading and screening are determined.According to these conclusions,combined with the performance requirements of the mechanical flip unloading and screening device of black soldier flies,the design and calculation of the unloading and screening device were carried out.(3)Based on the EDEM software,the simulation motion and experimental analysis of the flip unloading mechanism are carried out.Single factor test and response surface test were carried out under different parameter levels.Using Design-Expert software to analyze the test results,it is concluded that the optimal parameter combination of the flip unloading mechanism is as follows: the rotation speed of the tray is 60 r/min,the angle of the baffle is 130°,and the speed of the conveyor belt is 0.30 m/s.The average value of the unloading deviation in the simulation test is 19.01%.The verification test of the flip unloading mechanism is carried out,and the results show that the average value of the unloading deviation under the optimal parameter combination is 19.69%,and the simulation optimization results are basically consistent with the verification test results.(4)Motion and test analysis of the screening mechanism.Single factor test and response surface test were carried out under different parameter levels,and the test results were analyzed by Design-Expert software,and the optimal parameter combination of the screening mechanism was obtained as follows: the rotation speed of the drum is 30 r/min,the inclination angle of the drum is 7°,the feeding amount is 1.60t/h.The screening mechanism’s Validation test results show that the impurity rate is1.17% and the loss rate is 8.87% under the optimal parameter combination.The screening mechanism has good separation effect,efficient operation,and meets the design requirements.This paper aims at the large deviation of the unloading of black soldier flies frass and the incomplete separation of black soldier flies frass,which solves the problem of large unloading deviation,low screening efficiency,high impurity rate and high loss rate of black soldier flies frass.Experimental consequent can provide consultation for parameter optimization of unloading and screening equipment for black soldier flies frass.