Polushyna M.V., Moskalеva T.V. Traction capability of friction hoist with bobbin counterbalancing device
- Details
- Parent Category: Geo-Technical Mechanics, 2019
- Category: Geo-Technical Mechanics, 2019, № 149
Geoteh. meh., 2019, 149, 68-76
https://doi.org/10.15407/geotm2019.149.068
TRACTION CAPABILITY OF FRICTION HOIST WITH BOBBINCOUNTERBALANCING DEVICE
1Polushyna M.V., 1Moskalеva T.V.
1National Technical University Dnipro Polytechnic
UDC 622.678.5/673.1
Language: Russian
Annotation.
In this article, the authors presents results of their study of how parameters of friction hoist with bobbin counterbalancing device and rubber-steel ropes influence on capacity of the sheaves to transmit traction force by friction without rope slipping. The need to solve the problem is caused by the feature of this machine, which consists in simultaneous operation of two friction sheaves. The friction hoist with bobbin counterbalancing device consists of two driving friction sheaves, one of them is located on the ascending branch of the rope, the other – on the descending branch, and the bobbin device for winding the rubber-steel rope installed between the sheaves. The bobbin device provides static balancing of the hoist, and, therefore, eliminates the need for counterbalancing ropes. Installation of the DC motors on the sheaves with the diameter smaller than the average diameter of the bobbin allows reducing cost of the drive by 2 ... 2.5 times due to the higher speed of rotation. It was established that the most dangerous mode for rope slippage is the acceleration of a descending skip from an unloading station during lifting. Mode of safety braking was not considered because braking system is mounted on the bobbin, and rope slippage is not dangerous. The modes of operation of the hoist in the vertical shafts and on inclined track of an opencast mine were considered. A formula for determining critical acceleration when the rubber-steel rope begins to slide along the sheave and a formula for determining the minimum required contact angle between the friction sheave and rope for the conditions of no rope slippage were obtained. As a result of the study, the design parameters of the hoist, which influence most effectively the critical acceleration, were determine, such as the weight ratio of an empty skip to the loaded one and the ratio of the final radius of the rope winding on the bobbin to the initial radius. The studies show that the hoisting system meets safety requirements and provides sufficient tractive ability. The required contact angle can always be increased by rational layout of the bobbin counterbalancing device and friction sheaves.
Keywords: hoisting machinery, friction sheave, rope slippage, tractive capacity
References
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https://doi.org/10.31474/1999-981x-2017-2-169-175
About the authors
Polushyna Maryna Vitaliivna, Candidate of Technical Science (Ph.D.), Associate Professor, Associate Professor in Department of Mining Machines and Engineering of National Technical University Dnipro Polytechnic, Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.
Moskalova Тetyana Vitaliivna,Candidate of Technical Science (Ph.D.), Associate Professor, Associate Professor in Department of Mining Machines and Engineering of National Technical University Dnipro Polytechnic, Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.