Search results

Filters

  • Journals
  • Authors
  • Keywords
  • Date
  • Type

Search results

Number of results: 4
items per page: 25 50 75
Sort by:
Download PDF Download RIS Download Bibtex

Abstract

The paper is concerned with an analysis of behaviour of the cableway. On the basis of design data and results of adequate experiments, a physical model of cableway was formulated. The static of cableway was developed assuming a full nonlinear model based on elastic catenary curve. The tension of the rope and the reactive forces between the rope and the supports were calculated. Assuming various loadings of the rope, the relation between the tension in bottom and upper stations and the length of the rope was determined. The model describing the motion of the system is linear. Finite elements were used to formulate the model. Two methods of accelerating the system were investigated.

Go to article

Authors and Affiliations

Janusz Kowal
Jacek Snamina
Andrzej Podsiadło
Jarosław Konieczny
Download PDF Download RIS Download Bibtex

Abstract

To improve the durability of the rollers of supporting and guiding devices as well as traction ropes of ropeway facilities based upon the analysis of their contact interaction. Theoretical studies of a mathematical model of contact interaction of mine ropeway components to determine regularities of the formation of dynamic efforts within the contact area and experimental studies of the plant under mine conditions. Based upon a mathematical model, contact stresses within the zone of contact of traction rope with guiding rollers and drive sheaves of mine ropeways under real operating conditions have been determined. The obtained results are validated experimentally under mine conditions. Innovative patent-protected design solutions have been proposed; the solutions make it possible to considerably increase the durability of the ropeway components.
It has been determined that methods of surface increase in the strengthening of a roller working surface do not have proper effect as the strengthened layer on a soft base cracks and delaminates due to high contact loads; maximum angle of rope bending on rollers of supporting devices (6º – in operation manual; 15º – in safety rules) recommended for GRW is overstated. It shouldn’t be more than 1.5º in terms of values of contact stresses for standard plants; development of prestressed compression state in the material of elastic lining of a drive friction sheave allows increasing considerably (by two times and more) its service life. Ropes with reduced diameters of external layer wires (Ukraine’s regulatory document – DST 2688) being used currently on mine ropeways do not meet the operating conditions and have a short period of service life due to their corrosive and fatigue breaking. To lengthen the service life of GRW traction ropes, it is required to change for the ropes with increased diameters of the external layer wires with preliminarily clamped strands.
(Ukraines regulatory documents: DST 3077, DST 3081, DST 7668, DST 7669 and TU 14-4-1070).
Go to article

Bibliography

[1] O. Denyshchenko, L. Posunko, A. Shyrin, M. Kechin, Increase in the Efficiency of Ground Cableways in the Process of Zonal Development Working. Collection of research papers of National Mining University 46, 159-168 (2015).
[2] V . Rastsvetaev, Additional Loads on Tunnel Arch Supports Under the Action of Overhead Monorail in the Western Donbas Mines. Heotekhnichna Mekhanika 117, 53-59 (2014).
[3] A. Shyrin, V. Rastsvetaev, T. Morozova, Estimation of Reliability and Capacity of Auxiliary Vehicles While Preparing Coal Reserves for Stoping. Geomechanical Processes during Underground Mining: School of Underground Mining 105-108 (2012).
[4] A. Dryzhenko, A. Shustov, S. Moldabayev, Justification of parameters of building inclined trenches using belt conveyors. 17th International Multidisciplinary Scientific GeoConference SGEM 17, 471-478 (2017). DOI: https://doi.org/10.5593/sgem2017/13/S03.060
[5] O. Denyshchenko, A. Shyrin, V. Rastsvietaiev, O. Cherniaiev. Forming the Structure of Automated System to Control Ground Heavy-Type Ropeways. Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu 4, 79-85 (2018). DOI: https://doi.org/10.29202/nvngu/2018-4/12
[6] R.P. Singh, M. Mallick, M.K. Verma, Studies on failure behaviour of wire rope used in underground coal mines. Engineering Failure Analysis 70, 290-304 (2016). DOI: https://doi.org/10.1016/j.engfailanal.2016.09.002
[7] S. Moradi, K. Ranjbar, H. Makvandi, Failure Analysis of a Drilling Wire Rope. Journal of Failure Analysis and Prevention 12 (5), 558-566 (2012). DOI: https://doi.org/10.1007/s11668-012-9596-7
[8] Shaiful Rizam Shamsudin, Mohd Harun, Mazlee Mohd Noor & Azmi Rahmat. Failure Analysis of Crane Wire Rope. Materials Science Forum 819, 467-472 (2015). DOI: https://doi.org/10.4028/www.scientific.net/MSF.819.467
[9] А.N. Koptovets, L.N. Shyrin, E.М. Shliakhov, А.V. Denishchenko, V.V. Zil, V.V. Yavorskaia, Modeling operating processes in shoe and wheel brake of mine locomotives. Monografiya. Dnepr: National Mining University 258 (2017).
[10] V.А. Korotkov, Wear-resistance of machines. Moskva: Direkt-Media (2014).
[11] V .D. Goncharov, D.V. Pershina, Optimization of surface microrelief to improve adhesive strength of surface and base. Modern Technologies In Engineering 8, 79-87 (2013).
[12] K .I. Kozorezov, N.F. Skogorova, Steel strengthening by means of shock waves. Physics and Chemistry of Metalworking. 2, 99-105 (2015).
[13] S.V. Razorionov, G.V. Garkushin, Strengthening of metals and alloys in terms of shock compression. Journal of Technical Physics 85 (7), 77-82 (2015).
[14] P.А. Gavrish, Ye.V. Berezhnaia, Ye.А. Sobolev-Butovchenko, Thermal spraying of antifriction coating of the components of Takraf loading elevator. Scientific messenger of Donbass State Engineering Academy 2 (20Е), 50-54 (2016).
[15] D.А.Volchenko, А.V. Voznyi, О.B. Stadnyk, V.S. Vetvitskii, On the problem of using dynamic models of disc-shoe brakes of transportation vehicles in drives of handling facilities. Problems of Friction and Wearing 2 (75), 24-36 (2017).
[16] М.P. Martyntsiv, B.V. Solohub, М.V. Matiyishyn, Dynamics and reliability of cableway systems. Lviv: Editing house of Lviv Polytecnic (2011).
[17] D . Kolosov, O. Dolgov, A. Kolosov, Analytical determination of stress-strain state of rope caused by the transmission of the drive drum traction. Progressive Technologies of Coal, Coalbed Methane, and Ores Mining, 499-504 (2014). DOI: https://doi.org/10.1201/b17547
Go to article

Authors and Affiliations

Jamil Sami Haddad
1
ORCID: ORCID
Oleksandr Denyshchenko
2
ORCID: ORCID
Dmytro Kolosov
2
ORCID: ORCID
Stanislav Bartashevskyi
2
ORCID: ORCID
Valerii Rastsvietaiev
2
ORCID: ORCID
Oleksii Cherniaiev
2
ORCID: ORCID

  1. Al-Balqa Applied University, 1 Al-Balqa Applied University, Jordan
  2. Dnipro University of Technology, Ukraine
Download PDF Download RIS Download Bibtex

Abstract

The paper presents the implementation of the method of own residual magnetic field to identify damages occurring in a steel rope. A special measuring head with 4 residual magnetic field sensors, spaced evenly every 90 degrees, was used. The measuring head was also equipped with a path or a time sensor. The measurement consists in recording normal and tangential components of the residual magnetic field and their gradients. This method has a number of advantages with regard to classic magnetic methods. It does not require special magnetisation of the rope or its special preparation for testing. Validation of the obtained test results of this rope was conducted by the classic MTR method and a very good compliance in the detection of damage was demonstrated. It was found that the strong magnetisation used in the MTR method does not affect the detection of damage to the rope using the residual magnetic field method.

Go to article

Authors and Affiliations

Janusz Juraszek
Download PDF Download RIS Download Bibtex

Abstract

The conduction of mining activity under the conditions of rock bursts and rock mass tremors means that designers often utilise support systems comprising various configurations of steel arch, rock bolt and surface support. Particularly difficult geological and mining conditions, when wire mesh does not provide sufficient dynamic resistance, it requires an additional reinforcement with wire rope lacing in the form of steel ropes installed between the bolt ends and fixed to them by means of various rope clamps (e.g. u-bolt clamps). Bench tests were conducted to compare the strength of wire ropes under static and dynamic loading. The tests involved wire ropes with an internal diameter of Ø15.7 mm. Tests under static loading demonstrated that the cable bolts transferred a maximum force Fs max = 289.0 kN without failure, while the energy absorbed until failure was E 1s = 16.6 kJ. A comparative test result analysis for the wire ropes used in the bolt designs revealed that the influence of dynamic loading forces has a significant effect on reducing the rope load capacity, which results in the brittle cracking of the wires in the rope. Although the average dynamic force leading to wire rope failure F dmax = 279.1 kN is comparable to the minimum static force Fmin = 279 kN defined in the relevant standard, the average energy E1d absorbed by the cable bolt until failure is 48% lower than the energy E1s determined for wire rope failure under static loading. Furthermore, cable bolt failure under dynamic loading occurred at an impact velocity of the combined ram and crosshead masses ranging within vp = 1.4-1.5 m/s.
Go to article

Authors and Affiliations

Andrzej Pytlik
1
Mariusz Szot
1
ORCID: ORCID

  1. GIG – National Research Institute, Plac Gwarków 1, 40-166 Katowice, Poland

This page uses 'cookies'. Learn more