Abstract
With the development of science and technology, more and more demand was proposed in the sieving industry. The sieving theory has been used to optimize parameters of vibrating screen to achieve a higher screening efficiency. Perfecting the sieving theory was became the main goal of most scholars to study the vibrating screen. Stratification as part of sieving theory research, the screening process and screening result was deeply influenced by stratification. In this paper, the sedimentation difference was defined to make the stratification became a numerical description. The discrete element method (DEM) has been used to simulate the screening process about the vibrating screen with translation-swing composite motion. The relationship between screening efficiency and sedimentation difference under each parameter is established and the effect of stratification on screening efficiency is studied under various single parameter conditions including vibration frequency, amplitude, vibration direction angle, swinging frequency, and swinging angle. The conclusions are: sedimentation difference is closely related to screening efficiency, the screening efficiency had obviously a positive correlation with the sedimentation difference. Combined with the value of the sedimentation difference, a better positive stratification is meaningful to the screening process and screening efficiency.
Highlights
Sieving machinery is used to classify particle material by particle size in the industry
As a criterion for evaluating screening efficiency (SE), η is described as: η where m, m are the mass of particles whose diameters are smaller than d and bigger than d. m, m are the mass of particles whose diameters are smaller than d and bigger than d and their position is under the screen surface, η is screening efficiency of the separation size is d
The sedimentation difference increases with vibration frequency when vibration frequency is less than 18 Hz, and it decreases with vibration frequency when vibration frequency is greater than 18 Hz
Summary
Sieving machinery is used to classify particle material by particle size in the industry. Chen Yanhua and Tong Xin [4, 5] stated briefly that stratification in sieving is the process that fine particles passed through coarse particles and reached to screen surface when the screen is vibrating. Rao [6] has presented several factors that influence the stratification process, such as particle size, shape, and density In these articles, stratification is defined as the content of fine particles in a certain thickness of material on the screen surface. This stratification configuration leads to the fine particles can’t reach to screen surface, so we should avoid the appearance of stratification configuration of Anti Brazil fruit. A) Stratification configuration of Brazil fruit under ideal condition b) Stratification configuration of Anti Brazil fruit under ideal condition c) Sandwich configuration under d) Stratified configurations under ideal condition actual screening condition
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