Safety Evaluation of Drive Shaft by Structural Analysis when the Escalator Reverse Driving Prevention Device is Operated 


Vol. 39,  No. 4, pp. 15-25, Aug.  2024
10.14341/JKOSOS.2024.39.4.15


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  Abstract

Over the past three years, accidents due to escalators running backward have occurred in Korea. The reverse driving prevention device is a safety feature designed to prevent over-speeding or reverse driving if the escalator suddenly changes direction while moving upward or downward. This device must ensure the reliability and structural safety of each component. Moreover, it must stop smoothly to prevent passenger accidents caused by sudden stops. This device employs the commonly adopted pawl– ratchet braking mechanism. It must be robust enough to withstand the forces applied to the pawl and ratchet, and inspection standards require a safety factor of 3.5 or higher. This device is installed for safety purposes and requires excellent braking performance and structural integrity. Therefore, evaluating product reliability, component strength, and safety is crucial. In this study, structural safety was assessed through structural analysis simulations based on design modeling, and various environmental conditions were considered. The research confirmed that when the reverse driving prevention device was operated under maximum load conditions on both solid and hollow shafts of different sizes, the safety factor was greater than 3.5, and the deformation of the drive shaft was minimal, 0.001–0.017 mm. Thus, the safety of the device was confirmed.

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  Cite this article

[IEEE Style]

정재윤, 김성호, 김동복, 김동희, "Safety Evaluation of Drive Shaft by Structural Analysis when the Escalator Reverse Driving Prevention Device is Operated," Journal of the Korean Society of Safety, vol. 39, no. 4, pp. 15-25, 2024. DOI: 10.14341/JKOSOS.2024.39.4.15.

[ACM Style]

정재윤, 김성호, 김동복, and 김동희. 2024. Safety Evaluation of Drive Shaft by Structural Analysis when the Escalator Reverse Driving Prevention Device is Operated. Journal of the Korean Society of Safety, 39, 4, (2024), 15-25. DOI: 10.14341/JKOSOS.2024.39.4.15.

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