Citation

Lu Y, Yang Y, Shao S, He W, Wang W, Yan X. China Saf. Sci. J. 2022; 32(5): 55-60.

Copyright

(Copyright © 2022, China Occupational Safety and Health Association, Publisher Gai Xue bao)

DOI

10.16265/j.cnki.issn1003-3033.2022.05.1184

PMID

unavailable

Abstract

In order to address shortcomings of existing descent devices, such as large volume, complex structure and uncontrollable speed, a new high⁃rise escape device with controllable speed was designed. Firstly, relationship between its descent speed and orifice diameter was deduced. Then, a dynamic model of the device was established by using AMESim software, and its descent speed was simulated under different loads and different throttling apertures. Finally, safe adjustment range of orifice diameter was determined through simulation analysis, and purpose of variable speed and slow descent was achieved by adjusting orifice diameter of throttle holes connected in series between two hydraulic cylinders. The results show that the new descent device features simple structure and small volume, allowing users to freely adjust its descent speed within throttling aperture of 1 - 6 mm according to escape demand, with a maximum speed of no more than 1. 5 m / s. For objects with different weights, the speed change range always tends to be stable, which greatly improves applicability and safety of the descent device. © PHYSOR 2022 China Safety Science Journal. All rights reserved.

Language: zh