Abstract
Based on analyzing the problem of the screen with circular, linear, and elliptical trajectory, the spatial Lissajous trajectory has been put forward. The article analyzes the dynamic theory of the spatial Lissajous trajectory screen, and the virtual simulation with discrete-element method is applied to study the solid migration rules. A discrete-element model is developed based on the JKR contact model which takes into considerations viscous forces of contacting particles. Two important factors, migration velocity and filter ratio, are selected to describe the working performance of the vibrating screen. The research results show that the spatial Lissajous vibrating screen has approximate solid migration velocity like the linear vibrating screen, but the filter rate of spatial Lissajous trajectory is the highest. Therefore, the spatial Lissajous trajectory vibrating screen can reduce the phenomenon of screening blockage, and the advantage will be more evident in the case of high drilling fluid viscosity, high mesh number, and serious screen blockage.
Highlights
The vibrating screen is a key equipment for separating granular materials based on size and is often used extensively in mining, building, agriculture, metallurgy, drilling, and other industries.[1]
Particle migration velocity is an important index of the performance of vibrating screen
The average migration velocity of particle group is used as the index
Summary
The vibrating screen is a key equipment for separating granular materials based on size and is often used extensively in mining, building, agriculture, metallurgy, drilling, and other industries.[1]. Keywords Vibrating screen, spatial Lissajous trajectory, solid particle, migration Aiming to develop a new type of screen with better screening efficiency and processing performance, the spatial Lissajous trajectory has been put forward as Figure 1(d).
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