Simulation And Experiment Of The Conveying And Removing Device On Corn Stalk Granulator

At present,The straw curing molding equipment in China is mainly in fixed-based,need to collect,transport,storage,crushing and a series of preparatory work,therefore our group companies jointly developed self-propelled The straw ring molding granulator can complete the collection,crushing,transportation,soil removal,and solidification of the straw at one time,reducing production costs,processing procedures,and labor intensity.The main structure of the conveying and soil removal device of the machine is a screw conveying shaft and a screen,which is responsible for conveying the picked up materials and filtering out the impurities.The earlier designed conveying soil removal device has the problems of low soil removal rate,high straw loss rate and large power consumption,which greatly affects the operating effect of the self-propelled ring mold pelletizer,so the conveying soil removal device is optimized.By consulting domestic and foreign literature,it is determined that the discrete element simulation test method is used to optimize the structural parameters of the conveying soil removal device,and the method of building a test bench is determined to optimize the working parameters of the conveying soil removal device.By analyzing the force and movement of the material in the device,it provides a theoretical basis for the preliminary design of the device,combined with the mechanical design formula,designing the conveying soil removal device,drawing three-dimensional models and engineering drawings,and providing references for subsequent parameter optimization.The main research results of this paper are as follows:(1)Based on the parameters of the existing conveying soil removal device,the model of the conveying soil removal device is reasonably simplified,and Rocky DEM software is used to analyze the movement of materials in the device.The single factor simulation test is carried out with the sieve aperture,the pitch,the gap between the blade and the shell as factors,and the soil removal rate and the straw loss rate as indicators.The ternary quadratic orthogonal rotation combined simulation test was carried out within the horizontal range of each factor,and the sieve aperture was determined to be 15.2mm,the pitch of 160 mm,and the blade and shell gap 4.6mm as the optimal structural parameters.The experiment verified that the straw loss rate was 9.65 %,the soil removal rate is 72.9%.(2)According to the optimal structural parameters obtained from the multi-factor simulation test,a test bench for the conveying soil removal device was developed,and the single-factor test bench was tested based on the rotation speed of the screw shaft,the feeding amount,and the soil removal rate.After determining the factor level through single factor test,carry out binary quadratic regression orthogonal rotation combination test to optimize the working parameters of the device,and finally determine that the speed is 1716.8r/min,the feed rate is 12.8kg/min,and the soil removal rate is 75.8%.According to the actual situation,the speed is 1750r/min,the feed rate is 13kg/min,and the soil removal rate is 72.6% verified by experiments.