Zhihula T.I. Torsion of an unevenly loaded tubular belt on a straight route of a belt tubular conveyor
- Деталі
- Батьківська категорія: Геотехнічна механіка, 2019
- Категорія: Геотехнічна механіка, 2019, № 146
Geoteh. meh. 2019, 146, 159-167
https://doi.org/10.1051/e3sconf/201910900125
TORSION OF AN UNEVENLY LOADED TUBULAR BELT ON A STRAIGHT ROUTE OF A BELT TUBULAR CONVEYOR
1Zhihula T.I.
1Institute of Geotechnical Mechanics named by N. Poljakov of National Academy of Sciences of Ukraine
UDC 622.647.2:681.5
Language: English
Abstract.
The belt of the tubular conveyor is rolled up into a pipe and moves inside the roller supports, subject to the action of torques resulting from the bending of the conveyor belt, the skewing of the supporting rollers, and uneven loading of the belt. These moments can lead to a significant angular rotation of the belt, which, in turn, will cause loss of stability, spillage and dusting of the load. The problem of torsion of a tubular belt in a straight section of the conveyor path under the influence of a stationary decentralizing factor - off-centre belt loading is considered. The belt is presented in the form of a tubular rod with one rigidly clamped and the other free end, to which is applied the torque from the uneven load and the moment opposing it from the friction forces of the belt on the rollers. In order to establish the limits of the possible angular displacement of the tubular belt and give specific recommendations on the choice of the parameters of the belt and roller bearings, the cases of maximum and minimum load are considered. Formulas are obtained for determining the angle of rotation of the belt on the roller support, which is compared with the permissible twisting angle, that is, the angle at which the edges of the belt do not diverge and the load spills. Friction of the surface of the belt on the rollers acts as a stabilizing factor. It is shown that torsion does not occur if at maximum load the coefficient of friction f > 0.14, at minimum load the coefficient of friction f > 0.4575. The coefficient of friction of rubber on steel does not exceed 0.5 for dry surfaces. If the surfaces are flooded or frozen, the friction coefficient may be halved. Such values of the friction coefficient can lead to belt torsion with minimal uneven loading. Thus, when choosing materials for the belt and rollers (or their linings), one should choose pairs with f > 0.5, and when using BTC, try to avoid watering or freezing of the belt. The factors affecting the torsion of an unevenly loaded tubular belt as it moves along the straight part of the conveyor are investigated. The angle of rotation of the belt depends not only on the magnitude of the applied torque, but also on the design of the conveyor , the geometric characteristics of the section of the tubular belt , the physical properties of its material. For various options for loading the belt with maximum irregularity, the influence of the coefficient of friction of the belt on the rollers on the possibility of its rotation has been investigated. It is shown that with a decrease in the load of the belt, the danger of its torsion increases.
Keywords: tubular conveyor, torsion of a tubular belt, uneven loading, roller support, friction of a belt on rollers.
REFERENCES
1. Kiriya, R. V and Larionov, M. G. (2016), “Mathematic modeling of linear belt item stress strain state tubular conveyor”, Geo-Technical Mechanics, no. 131, pp. 153–164.
2. Kiriya, R. V., Larionov, G. I. and Larionov, M.G. (2018), “Mathematic model of the belt linear sector twisting in tubular conveyor”, Geo-Technical Mechanics, no. 138, pp. 218–226.
3. Zhyhula, T. I. (2016), “Features of dynamics of tubular belt for different constructions charts of belt tubular conveyors”, Geo-Technical Mechanics, no. 131, pp. 165–172.
About the author
Zhihula Tetyana Illinivna, Candidate of Technical Sciences (Ph. D), Senior Researcher, Senior Researcher in Department of Geomechanics of Mineral Opencast Mining Technology, Institute of Geotechnical Mechanics named by N. Poljakov of National Academy of Sciences of Ukraine (IGTM, NASU), Dnipro, Ukraine, Ця електронна адреса захищена від спам-ботів. вам потрібно увімкнути JavaScript, щоб побачити її.