Design And Performance Analysis Of Horizontal Auger Automatic Feeding Machine Based On EDEM

For solving the problems of high labor intensity,uneven feeding and other problems in aquaculture,this paper designs a horizontal auger automatic feeding machine.After the discrete element simulation parameters of pellet feed were determined by particle simulation software EDEM,the feeding performance of the feeding machine was analyzed by simulation and actual test.The main contents of this study include:(1)In the study of the interaction between fishery feeding device and pellet feed,obtaining accurate pellet feed contact parameters is a key factor to research.For determining the discrete element simulation parameters of the pellet feed,the repose angle test was carried out to obtain the accumulation phenomenon of pellet feed.The MATLAB technology was used to extract the repose angle of pellet feed,the repose angle as response value calibrating the discrete element simulation parameters of pellet feed.The PlackettBurman test was used to select the optimal parameters,and then according to the steepest climbing test,it quickly entered into the area near the best significant parameters,and then the box Behnken test was used to establish the mathematical model between the angle of repose and the parameters,and finally a set of optimal significant parameters were obtained.(2)A horizontal auger feeder was designed to meet the requirements of precise feeding.The mechanical structure of the feeder was analyzed theoretically.The mechanical model of feed particles was established.The mechanical model of feed particles was established and analyzed from kinematics and mechanics.Through studying the working principle of the feeding machine,the influence of its structure and working parameters on its conveying performance was analyzed,and then the main design parameters of the feeding machine were determined by calculation.(3)The working process of the feeder was simulated by EDEM.The discrete element model of feed particles was established according to the calibrated discrete element parameters.The model of the feeder was imported from the three-dimensional design software.The contact model was selected and the simulation parameters were set.In the simulation post-processing module,a single feed granule was selected for observation,and its movement track,speed and force variation law were analyzed;the diameter,pitch and rotation speed of helical blade at different levels were combined by the method of combined experimental design,to study the significant influence of different parameters on feeding amount,and the regression model between feed amount and above parameters was established.(4)By comparing the simulation value of feeding quantity with the measured value,the relative error between them is small,which proves that the discrete element method is feasible.The effect of the parameters of feeding machine on the variation coefficient of feeding stability were studied by using the method of combined experimental design.Firstly,the mathematical model of each parameter and coefficient of variation was established,and then a set of optimal parameter combinations of feeding machine were obtained through automatic optimization.The optimized parameters are used to repeat the test,and the error of the test is small,which indicates that the parameters obtained through optimization are reliable.