Dynamic analysis of new type elastic screen surface with multi degree of freedom and experimental validation

SONG Bao-cheng(宋宝成)^{1, 2}, LIU Chu-sheng(刘初升)^{1, 2}, PENG Li-ping(彭利平)^{1, 2}, LI Jun(李珺)^{1, 2}

(1. School of Mechanical and Electrical Engineering, China University of Mining and Technology,
Xuzhou 221116, China;
2. Xuyi Research and Development Center of Mining Equipment and Materials,
China University of Mining and Technology, Xuyi 211700, China)

Abstract:A feasible method was proposed to improve the vibration intensity of screen surface via application of a new type elastic screen surface with multi degree of freedom (NTESSMDF). In the NTESSMDF, the primary robs were coupled to the main screen structure with ends embedded into the elastomers, and the secondary robs were attached to adjacent two primary robs with elastic bands. The dynamic model of vibrating screen with NTESSMDF was established based on Lagrange’s equation and the equivalent stiffnesses of the elastomer and elastic band were calculated. According to numerical simulation using the 4th order Runge-Kutta method, the vibration intensity of screen surface can be enhanced substantially with an averaged acceleration amplitude increasing ratio of 72.36%. The primary robs and secondary robs vibrate inversely in steady state, which would result in the friability of materials and avoid stoppage. The experimental results validate the dynamic characteristics with acceleration amplitude rising by 62.93% on average, which demonstrates the feasibility of NTESSMDF.

Key words:vibrating screen; elastic screen surface; multi degree of freedom; dynamic analysis; mesh stoppage prevention