Kinematics analysis and 3 mm classification test of a new elastic screen with striking shaft

Abstract

ABSTRACT During the screening process of fine-grained coal, there is often blockage and detachment of screening plates, a novel screen surface with an additional striking shaft was proposed to solve the problem. The motion characteristics of the striking shaft and screen surface under different excitation parameters were systematically investigated by vibration test and analysis system. The effect of operating parameters on the elastic screening performance was explored through screening experiments. The results showed that the vibrating frequency of the striking shaft was consistent with that of the motor, whose motion waveform was simple harmonic and moved in the straight trajectory. The acceleration and displacement at 1/2 of the screen surface were significantly higher than the values at 1/4, which reached 304.57 m/s2 and 31.87 mm, respectively, and the ejection strength of particles was 18.47 at this time. It was found that when the exciting force was 18 kN, the excitation frequency was 12.0 Hz, and the processing capacity was 14 t/h·m2, the elastic screening could achieve the best screening performance, where the screening efficiency was 83.94%, and the total misplaced content was 8.36%. For the design of elastic screening equipment, this study will provide valuable theoretical and technical guidance.