Abstract
A new composite vibrating mode is presented in this paper. Modeling and dynamic analysis are studied according to two‐degree‐of‐freedom systems theory. The effects of vibration parameters, including swing angle, swing frequency, vibrating direction angle, and translation frequency, on the screening efficiency were researched by means of experiment research over a new laboratory‐scale composite vibrating screen which is designed based on the new composite vibrating mode. The results are analysed in terms of curves and fitting equations. Compared to the translation mode and swing mode, the screening performance of the new composite vibrating mode, both in screening efficiency and in processing capacity, is significantly improved.
Highlights
A new composite vibrating mode is presented in this paper
Modeling and dynamic analysis are studied according to two-degreeof-freedom systems theory. e effects of vibration parameters, including swing angle, swing frequency, vibrating direction angle, and translation frequency, on the screening efficiency were researched by means of experiment research over a new laboratoryscale composite vibrating screen which is designed based on the new composite vibrating mode. e results are analysed in terms of curves and fitting equations
E ect of the Swing Angle on Screening E ciency. e screening e ciency of particles of separation size 0.8 mm at swing angles ranging from 0.5° to 1.1° is calculated according to a series of experiments, which yield the curve shown in Figure 7. is demonstrates that the screening e ciency increases when swing angles are less than 0.87° and sharply decreases with the increase of the swing angle. is is because a larger swing angle leads to more energy of particles, which helps the particles pass through the screen surface
Summary
2.1. e Structural Model of the New Composite Vibrating Screen. e model of translation-swing composite vibrating screen is a typical two-degree-of-freedom vibration system. When the screen vibrates with the action of the two kinds of exciters simultaneously, motions of the screen will get coupled, that is, a composite vibrating mode. Force Analysis of the Particle on the Screen Surface under the Composite Vibration Mode. Where aty is the translation acceleration in the y direction; l is the distance between mass center of the particle to center of the screen surface; φ€ is the swing angular acceleration; ω1 and ω2 are the angular velocity of translation and swing, respectively; Aφ is the swing amplitude; and α is the initial angle between screen surface and horizontal. At, combined with the above translation and swing dynamic analysis, enables one to obtain the vibration intensity, throw index, etc., which can guide the design of composite vibrating screen Us, the force analysis of the particle under the composite vibration mode is determined by deriving Equation (18). at, combined with the above translation and swing dynamic analysis, enables one to obtain the vibration intensity, throw index, etc., which can guide the design of composite vibrating screen
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