Research On The Structure And Process Parameters Of The One-time-finished Grain Mill

The grain mill is used to grind grains,herbal medicines and other foods into fine powder.At present,the grain mill on the market needs to carry out rough grinding and fine grinding to obtain qualified products,and requires manual stirring to feed.The product size is adjusted by manual hand wheel,so the product quality is difficult to guarantee.Therefore,the development of a disposable grain mill,changing the original grinding process,to achieve full-automatic grinding.This paper focuses on the structure and process parameters of disposable grain mills.Specific research content includes:Based on the theory of pulverization,a one-time grain mill was designed.Through the research on its key components,the main working mechanism of the pulverizing mechanism,powder flow channel and milling mechanism was summarized,and the key structure and process parameters of each mechanism were selected research.Taking the smashing mechanism as the research object,the numerical simulation model is established based on the discrete element method,and the orthogonal experiment is designed to optimize the structure and process parameters of the pulverizing mechanism.The results show that among the parameters studied: the tool speed has the greatest influence on the pulverizing effect,and the tool liter Second,the number of tools has the least impact.The optimal parameter combination is the number of tools 3,the installation angle is 0°,and the rotation speed is 1250 r/min.Based on the discrete element method,the single factor experiment was designed to analyze the influence of various parameters on the powder channel transport efficiency.The results show that in the transverse feeding process,the axial high-speed particles are concentrated at the screw blades;The circumferential motion is transformed into axial motion,which shortens the movement path of the particles in the channel and improves the conveying capacity of the mechanism.In the scope of investigation,the screw conveying efficiency is positively correlated with the pitch and rotation speed.Combining theory and practical experience,the paper analyzes the flow characteristics of grain-type milling and uses the Fluent flow field analysis software to carry out numerical simulation analysis.The research shows that the dynamic pressure contour in the flow field is distributed in a ring shape,and its value increases as the radius of the grinding disc increases and the disc gap decreases.When the shape of the disc changes,the dynamic pressure rises sharply.The better material pulverization effect;through the comparison test,the best grinding effect is obtained when the rotating speed of the dynamic grinding disc is 1500 r/min,and the maximum grinding speed is between 0.5-0.75 kg/min.The design verification test verifies the optimization effect of the pulverizing mechanism.The results show that the theoretical optimization results are basically consistent with the experimental verification results.Therefore,the smashing mechanism simulation model is reliable,and the simulation parameter combination is accurate.