Spring Failure Analysis of Mining Vibrating Screens: Numerical and Experimental Studies

Liu Liu,Wang Wang,Cheng Cheng,Yang Yang,Meng Meng,Li Li,Suo Suo

doi:10.3390/app9163224

Liu Liu, Wang Wang + Show 5 more

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https://doi.org/10.3390/app9163224

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Abstract

Spring failure is one of the critical causes of the structural damage and low screening efficiency of mining vibrating screens. Therefore, spring failure diagnosis is necessary to prompt maintenance for the safety and reliability of mining vibrating screens. In this paper, a spring failure diagnosis approach is developed. A finite element model of mining vibrating screens is established. Simulations are carried out and the spring failure influence rules of spring failure on the dynamic characteristics of mining vibrating screens are obtained. These influence rules indicate that the amplitude variation coefficients (AVCs) of the four spring seats in the x, y, and z directions can reveal two kinds of single spring failure and four kinds of double spring failure, which are useful for diagnosing spring failure. Furthermore, experiments are conducted. Comparison analyses of the experimental results and simulation results indicate that the proposed approach is capable of revealing various kinds of spring failure. Therefore, this approach provides useful information for diagnosing spring failure and guiding technical staff to routinely maintain mining vibrating screens.

Highlights

Mining vibrating screens are widely used for coal mine washing and processing in China [1,2].Due to difficult working conditions and long-term alternating loads, spring permanent deformation failure of the spring may occur, and this leads to a decrease in spring stiffness
The system displacements in the established finite element model are sensitive to variable spring stiffness changes
This study reports a proposed approach for the spring failure diagnosis of mining vibrating screens by using numerical and experimental studies

Summary

Introduction

Mining vibrating screens are widely used for coal mine washing and processing in China [1,2]. Due to difficult working conditions and long-term alternating loads, spring permanent deformation failure of the spring may occur, and this leads to a decrease in spring stiffness. Mining vibrating screens are likely to experience this kind of spring failure during their service lifecycle [3,4]. This is one of the major causes of beam damage and material maldistribution [5]. Spring failure diagnosis is critical for prompt maintenance to keep mining vibrating screens safe and reliable

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