Novel Approaches for Processing of Multi-Channels NDT Signals for Damage Detection in Conveyor Belts with Steel Cords

Abstract:

Belt conveyors are one of the most popular methods of material transport in many branches of industry, especially in mining. The average length of mining belt conveyor is about 1000 m. Taking into account that total length of transportation ways in averaged mine can approach several dozen of kilometers and network of several conveyors may cover large area, maintenance of such specific transportation system is very difficult. In this work we propose an automatic multi-channel system for data acquisition and processing for damage detection in belts. Belts with steel cords are considered here, they consist of top and bottom rubber covers and steel cords in between them. Due to many reasons (mainly sharpness of transported materials) covers may be damaged and it may initiate degradation process or straight damages in steel cords. Properties of steel cords are therefore crucial for overall strength of belts, if they are damaged, it may cause catastrophic failure of the whole conveyor. So, monitoring of belts conditions is a crucial issue. We proposed a monitoring system that measure and process data from array of magnetic sensors. The system allows to acquire up to 24 channels of NDT signals and uses automatic algorithms to process them in order to get information about begin of the belt loop, location of joints of particular belt segments and the final location and size of damages related to corrosion or cuts of steel cords inside belts. These techniques will be presented in the paper. Our approach has been validated in a lignite mine for several conveyor belts.

• Periodical: Key Engineering Materials (Volumes 569-570)
• Pages: 978-985
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.569-570.978
• Online since: July 2013
• Authors: Ryszard Blazej, Leszek Jurdziak, Radoslaw Zimroz
• Keywords: Conveyor Belt, Damage Detection, Nondestructive Testing (NDT), Signal Processing

References

[1] W. Bartelmus, R. Zimroz: Belt conveyor driving system vibro-acoustic severity reduction by condition based maintenance, Prace Naukowe Instytutu Gornictwa Politechniki Wroclawskiej 123 (2008) 5-16.

[2] R. Zimroz, W. Bartelmus, Application of adaptive filtering for weak impulsive signal recovery for bearings local damage detection in complex mining mechanical systems working under condition of varying load, Diffusion and Defect Data Pt. B: Solid State Phenom. 180 (2012).

DOI: 10.4028/www.scientific.net/ssp.180.250

[3] L. Gladysiewicz, R. Krol, J. Bukowski: Tests of belt conveyor resistance to motion, Maintenance and Reliability 51/3 (2011) 17-25.

[4] P. Kulinowski,: Simulation studies as the part of an integrated design process dealing with belt conveyor operation, Maintenance and Reliability 15/1 (2013) 83-88.

[5] R. Błażej, R. Makowski, R: Zimroz A method of damage detecting in conveyor belts with steel cords. The Polish patent application - No P 393527, 31. 12. (2010).

[6] R. Błażej, L. Jurdziak: Integrated diagnostic device for automatic assessment of conveyor belts condition. Proceedings of 22nd World Mining Congress & Expo, 11-16 September, Istanbul-(2011). Vol. 3 / ed. Şinasi Eskikaya. Ankara, pp.675-680.

[7] R. Zimroz, R. Makowski R. Błażej: A method of damage detection in conveyor belts with steel cords by NDT signal processing. Proceedings of The Eighth International Conference CM2011/MFPT2011 Cardiff, Wales, (20-22 June 2011), Coxmoor Publishing Company.

[8] D. Mazurkiewicz, Problems of numerical simulation of stress and strain in the area of the adhesive-bonded joint of a conveyor belt, Archives of Civil and Mechanical Eng., 9/2 (2009) 75-91.

DOI: 10.1016/s1644-9665(12)60061-2

[9] Q. -L. Zeng, J. -G. Wang, L. Wang, C. -L. Wang, The research of coal mine conveyor belt tearing based on digital image processing, Advances in Intelligent Systems and Computing 181 AISC (2012) 187-191.

DOI: 10.1007/978-3-642-31698-2_27

[10] G. Fedorko, V. Molnár, J. Živčák, M. Dovica, N. Husáková: Failure analysis of textile rubber conveyor belt damaged by dynamic wear. Engineering Failure Analysis 28 (2013) 103-114.

DOI: 10.1016/j.engfailanal.2012.10.014

[11] A. Harrison, 15 Years of Conveyor Belt Nondestructive Evaluation, Bulk Solids Handling 16/1 (1996).

[12] D Blum, Scanning steel cord conveyor belts with the Belt C.A.T., MDR system. Journal of Bulk Solids Handling 16/3 (1996) 437.

[13] R. Blazej, M. Hardygóra: Modeling of shear stresses in multiply belt splices, Bulk Solids Handling 23/4 (2003) 234-241.