A vibration-test-based calculation method of screening material mass of a mining crank-link type flip-flow screen

• Published in: Energy sources. Part A, Recovery, utilization, and environmental effects Vol. ahead-of-print; no. ahead-of-print; pp. 1 - 21
• Main Authors: Wu, Jida, Liu, Chusheng, Jiang, Haishen, Zhang, Bo
• Format: Journal Article
• Language: English
• Published: Taylor & Francis 31-12-2024
• Subjects: coal screening; Crank-link flip-flow screen; dynamic model; Kolmogorov-Smirnov test; normal distribution; vibration test
• ISSN: 1556-7036; 1556-7230
• DOI: 10.1080/15567036.2020.1778139

Flip-flow screen is a key equipment for dry screening of wet fine coal, and its working load is of great significance to the screening effect and reliability. In order to obtain material mass load characteristics of a crank-link type flip-flow screen in the screening process, a vibration-test-based method is proposed. A complete dynamic model of the crank-link type flip-flow screen system is established by the centralized mass method. The correlation between the material mass and the kinematic parameters is deduced by dynamic theory analysis. The time-frequency analysis, envelope analysis, and Kolmogorov-Smirnov test are used to analyze the material mass statistical distribution characteristics during the screening process. Also, in the vibration tests at different rotation speeds, the relation between the parameters of the material distribution model and the rotational speed is obtained by the least square method. The results of the field experiment show that the maximum deviation of this method is 6.7%, and the material mass distribution model established by this method can well reflect the working state of the flip-flow screen.