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ArticleName Maximal stiffness of elastically damping device in traction of draglines
DOI 10.17580/gzh.2021.05.09
ArticleAuthor Klementieva I. N., Kuziev D. A.

NUST MISIS, Moscow, Russia:
I. N. Klementieva, Senior Lecturer, Candidate of Engineering Sciences
D. A. Kuziev, Associate Professor, Candidate of Engineering Sciences,


One of the critical objectives set by the long-term program of the coal industry development up to 2030, approved by the Government of the Russian Federation is coal extraction by the most effective open pit mining method using draglines. Traction of draglines is composed of a drive winch and rope transmissions. Digging (excavation) duration makes up to 30 % of the total operating cycle of a dragline. During digging, the traction, drive, gears and rope transmissions of a dragline are exposed to considerable dynamic loads. Deloading of the dragline traction is achievable through the use of an elastically damping device inserted in the rope transmission. With longer duration of the bucket performance, the force in the drag cables grows consequent on the increase in the digging resistance, tangential weight of the filled bucket and in the bucket–rock friction force as a result of the growing mass connected to the drag cables. At the same time, stiffness of the drag cables increases as their length gets shorter. Put it otherwise, the natural frequency in the drag cables–bucket system is a variable value and varies from the moment of the bucket breakaway up to the moment of digging termination. It is shown analytically that the efficient reduction in dynamic loading requires that the natural frequency of the elastic damper mounted in the rope transmission of a dragline is lower than the natural frequency in the rope cables–bucket system at the end of digging.

keywords Coal extraction, open pit mining method, dragline, rope transmission, traction, elastic damper

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