THE RELATIONSHIP BETWEEN STIFFNESS LOSSES AND LOSSES IN BEARINGS OF ROPE BLOCKS
DOI:
https://doi.org/10.15802/stp2017/109453Keywords:
block, rope, losses, bearing, stiffnessAbstract
Purpose. To determine the efficiency of rope blocks, it is necessary to determine the stiffness coefficient of the ropes of blocks, taking into account the classification group of the mechanism and the wrapping angle of a block by a rope. At this one should use well-tested values of the efficiency coefficients of the rope blocks, taking into account the wrapping angle of a block by a rope and the analytically found friction coefficients of the rolling bearings given to the trunnion. Methodology. The work presents the analytical method of determining the coefficient of bearing resistance of the block when it is rotated by both the inner and outer cages, as well as the design scheme of the bearing of the block. Findings. The analysis of the lubrication method effect, the operating mode of the mechanism and the wrapping angle of a block by a rope on losses in bearings was carried out for rope blocks. The corresponding comparative tables of losses are given. Analysis of the obtained calculation results allows us to establish: 1) the main resistance affecting the cable blocks efficiency is the resistance in bearings; 2) the second largest component is the stiffness losses, depending on the operating mode, the wrapping angle of a block by a rope, the type of bearing lubrication; 3) the block efficiency when rotating the inner cage is higher than rotating the outer one by about 3% with thick lubrication and 1M mode; 4) in the sequential location of assemblies with a rolling bearing, it is necessary to strive for the design of the assembly in which the inner cage rotates; 5) with the number of blocks up to 5, one can use the recommended definitions of block bearings in the literature with an error in the efficiency value of up to 10%. Originality. The authors obtained values of resistances in the rolling bearings of the rope blocks and stiffness losses due to the girth of the block by the rope. In this case, dependences were used to determine the coefficient of rolling friction, obtained using the Hertz analytic dependences on determination of contact stresses and deformations, as well as the experimental values of the coefficient of rolling friction for the blocks. Practical value. The resistance values obtained by the authors can be used for refined calculations of the mechanisms of machines.
References
Bogomas, V. M., Briljova, M. G., Bondarenko, L. M., & Glavatskij, K. C. (2015). Vplyv koefitsiienta tertia kovzannia ta kuta obkhvatu kolodkoiu ta strichkoiu halmivnoho shkiva na rivnovahu vazhilnoi systemy. Bulletin National University of Water and Environmental Engineering, Technical Sciences, 2, 120-125.
Dovbnia, M. P. (2002). Teoretychne vyznachennia syly kovzannia pry kochenni. Problems of Tribology, 2, 103-106.
Kovalskiy, B. S. (1986). Poteri na blokakh kanatnykh polispastov. Construction and Road Building Machines, 8, 34-37.
Kozhevnikov, S. N. (1969). Teoriya mashin i mekhanizmov. Moscow: Mashinostroeniye.
Boltenkova, O. M., Davydov, O. Y., Yegorov, V. G., & Ulshin, S. V. (2013). Mekhanika. Soprotivleniye materialov (teoriya i praktika). Voronezh: Voronezh State University of Engineering Technologies.
Gumerova, K. S., Petukhov, N. P., Kotlyar, V. M., & Sidorin S. G. (2014). Prikladnaya mekhanika. Kazan: Kazan National Research Technological University.
Gryaznov, B. A., Bukhtiyarov, V. K., Kakuevitskiy, V. A., Aronovich, D. A., & Nalimov, Y. S. (2013). Primeneniye i prochnost polimernykh materialov pri izgotovlenii i remonte mashin i oborudovaniya. B. A. Lyashenko (Ed.). Kyiv: G.S. Pisarenko Institute for Problems of Strength of the National Academy of Sciences of Ukraine.
Sinenko, Y. G., & Konishcheva, O. V. (2015). Mekhanika. Krasnoyarsk: SibFU.
Bohomaz, V. M., Bondarenko, L. M., Hlavatskyi, K. T., & Sokol, K. O.(2015). Method of the drive power determination of the mechanisms of the bridge crane movement considering the rolling friction. Science and Transport Progress, 5 (59), 123-131. doi: 10.15802/stp2015/55335
Aleksandrov, M. P., Gokhberg, M. M., Kovin, A. A., Kulkova, N. N., Mazover, I. S., Nevzorov, L. A., & … Sokolov S.A. (1988). Spravochnik po kranam (Vol. 1-2). Kharakteristiki i konstruktivnyye skhemy kranov. Kranovyye mekhanizmy, ikh detali i uzly. Tekhnicheskaya ekspluatatsiya kranov (Vol. 2). M. M. Gokhberg (Ed.). Moscow: Mashinostroeniye.
Yakovlev, S. A., Bondarenko, L. N. (2003). Sootnosheniya mezhdu pokazatelyami soprotivleniya kacheniyu i skolzheniyu v uzlakh mashin. Mining, constructional, road and melioration machines, 62, 88-92.
Gao, A., Yun, Z., Zhidong, W., & Hao, L. (2017). A general friction model of discrete interactions for tendon actuated dexterous manipulators. Journal of Mechanisms and Robotics, 9 (4), 041019. doi: 10.1115/1.4036719
Makhkamov, K. K. (2017). Energy analysis of wear of sliding friction units. Journal of Friction and Wear, 38 (2), 168-172. doi: 0.3103/s1068366617020143
Rahaman, M. L., & Zhang, L. (2017). Size effect on friction and wear mechanisms of bulk metallic glass. Wear, 376-377, 1522-1527. doi: 10.1016/j.wear.2017.01.068
Tabor D. (1955). The mechanism of rolling friction: The elastic range. Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences, 229 (1177), 198-220. doi: 10.1098/rspa.1955.0082
Downloads
Published
How to Cite
Issue
Section
License
Copyright and Licensing
This journal provides open access to all of its content.
As such, copyright for articles published in this journal is retained by the authors, under the terms of the Creative Commons Attribution 4.0 International License (CC BY 4.0). The CC BY license permits commercial and non-commercial reuse. Such access is associated with increased readership and increased citation of an author's work. For more information on this approach, see the Public Knowledge Project, the Directory of Open Access Journals, or the Budapest Open Access Initiative.
The CC BY 4.0 license allows users to copy, distribute and adapt the work in any way, provided that they properly point to the author. Therefore, the editorial board of the journal does not prevent from placing published materials in third-party repositories. In order to protect manuscripts from misappropriation by unscrupulous authors, reference should be made to the original version of the work.
