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Abstract
Flip-flow screens are increasingly used in the processing of fine wet coal. In this work, the vibration characteristics of an industrial-scale flip-flow screen with crank-link structure (FFSCLS) were investigated theoretically and experimentally. An improved kinematic model of FFSCLS was proposed and experiments are carried out to verify the reasonability. The effects of the key parameters of the eccentricity of the crankshaft, the rotational speed of the crankshaft, and the tension length of the screen surface on the vibration characteristics of the screen were investigated parametrically. The results show that the kinematic model can describe the vibration characteristics of screen perfectly with the maximum error between the theoretical and experimental results being within 6.96%. Moreover, the key parameters of the eccentricity of the crankshaft, the rotational speed of the crankshaft, and the tension length of the screen surface have significant effects on the vibrations of the screen body and screen surface. These parameters should be optimized to achieve maximum screening performance of the FFSCLS. This work should be useful for optimal design and efficient operation of the flip-flow screen.
Highlights
Screening plays a key role in the classification, medium draining, product dehydration, and desliming of coal [1,2,3]
The flipflow screens employed in the coal preparation industry have great advantages over traditional vibrating screens in the enhancement of screen surface vibration strength and few blockages of the apertures [13,14,15,16]
The flip-flow screens suffer from an exciting force generated by the vibration of the two screen boxes and an impact from the particulate materials, both of which could lead to spring fracture [18], and polyurethane surface rupture [19, 20]. us, a fundamental research of the effects about geometrical and operational conditions on the flip-flow screen vibration characteristics should be performed, which could be useful for optimum design and control of the flip-flow screen
Summary
Screening plays a key role in the classification, medium draining, product dehydration, and desliming of coal [1,2,3]. Based on the above review, only a few have focused on the fundamental theories of FFSCLS Parameters such as crankshaft eccentricity, crankshaft rotational speed, and tension length of the screen surface all play important roles on the vibration and screening performance of this flip-flow screen, which need to be studied further. Us, by ignoring the motion in the Y-direction, the displacement, velocity, and acceleration of the fixed box relative to the absolute coordinate frame OXY can be calculated through. Taking the first and second derivatives of equation (12), the floating box velocity and acceleration with the coordinate frame OXY can be obtained as follows:. Based on the working principle of FFSCLS shown, the vibration motion of the screen surface mainly consists of two parts of motions: the relative motion induced by the floating and fixed box beam that paralleled the screen surface. Where Y_, Y€ are the velocity and the acceleration of the screen surface midpoint along the ordinate, respectively
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