Research And Optimistic Design Of Vibrate Screening

Vibrating screen, the most commonly screener machinery used in engineering machinery, has been widely used in mining,metallurgy,medication,chemical industry, food processing, construction material and environment industry etc. The research on the basic mechanism of process of vibrating screen is the foundation of its performance improvement and design. The high screening efficiency and large capacity have been the urgent goal of screening operations. The traditional screening theory which based on experiments and probability statistics is hardly to meet the demand of designing better machines. Simulation of screening process with computer technology and mechanics theory proved to be a most important method of screening research.In this paper, with the way of DEM, the numerical simulation research about the process of vibrating screen has been done to analyze the effects of the various parameters. Based on EDEM (a software package), an improved 3-D model used in the numerical simulation has been built,which is more consistent with the reality. Taken screen length as an imbedded point, the paper tried to analyze the relationship between screening efficiency and screen length under the condition of each parameter, moreover general law was obtained between them. Integrative screening efficiency mathematic model was established and have been multi-level optimized, compared with simulation data, screening efficiency increase by 10%. According to the analysis of all experimental data, linear relationship between intermediate variables ln ( - ln (1 -η)) and ln ( x / 0.5l ) were found under the condition of structural parameter and vibration parameter simluations.In the paper, the phenomena of stratification and penetration in the process of vibratory screen have been deeply analyzed and summarized. The concept about the ratios of fine particles, stratification area, penetration area, stratification rate and penetration rate has been defined. Mathematical models between screen length, screen interval, time and the ratios of fine particles have been established both for stratification and penetration. Stratification and penetration rate formulas also have been obtained. Eventually the relationships between structural parameter, vibration parameter and stratification and penetration rate were gained and discussed. The optimal values of vibratary and structural parameter were obtained when stratification and penetration rate reach the peak. Defition the amount of fine particle rather than its equality to assess stratification and penetration is an innovation of screening study.For meeting the need of innovation design of vibrating screen, a combined and adjustable vibrating screen was researched and developed. Compared to traditional vibrating screen as experimental prototype, the combined and adjustable screen is an innovative design which can swiftly assemble experimental prototype for innovative plan, decreasing processing cost and cycle of the experimental prototype. Also, much more screening experiments about multi structural parameters and vibration parameters can be conducted.Compared with the results of simulation and experiment data, it can be easily concluded that the effect of screening efficiency along screen length coincides with the results of practice, and particle's stratification and penetration in the process of screen have regularity. Simulation methods established in the paper reflect actual characteristics and laws of vibratory screen. It is also an effective method for the screening analysis process of law and mechanism.