ПОШУК Й УСУНЕННЯ ПОВТОРЮВАНИХ ЗВ’ЯЗКІВ У СХЕМІ НАПРЯМНОГО КРИВОШИПНО-ПОВЗУНКОВОГО МЕХАНІЗМУ ЗАХОПЛЮВАЛЬНОГО ПРИСТРОЮ

R. P. Pogrebnyak; M. R. Pohrebniak

doi:10.15802/stp2020/208261

Authors

R. P. Pogrebnyak National Metallurgical Academy of Ukraine, Ukraine https://orcid.org/0000-0002-4685-1818
M. R. Pohrebniak National Technical University «Dnipro Polytechic», Ukraine https://orcid.org/0000-0002-2961-3383

DOI:

https://doi.org/10.15802/stp2020/208261

Keywords:

mechanical gripping device, structural analysis, mobility of mechanism, repeated connections, external connections

Abstract

Purpose. The article is aimed to carry out a structural analysis of the coupled straight-guiding crank-slide mechanism of variable structure gripping devices with external unilateral constraints. It is also necessary to determine the number of internal and external repeating connections in the contours of the mechanism at different stages of its functioning, to assess their possible perniciousness and to suggest ways to reduce them. Methodology. Achieving this goal is carried out based on the universal structural theory of Ozols mechanisms for analyzing the gripping device as a mechanism with geometric, internal and frictional holonomic external constraints. Ozols internal and external structural formulas are used. Findings. The eleven-link gripping device is built on the basis of coupled central parallelogram crank-slider mechanism with a driving cranks. Synchronous driving cranks act on elongated connecting rods connected to sliders and gripping clamp elements. Gripping clamp elements carry out plane-parallel movement. Structural analysis was performed using structural schemes for two states of the mechanism: before clamping the object and in the state of the clamped object. In the first state of the mechanism with kinematic pairs of class V, the one-movable scheme contains thirteen internal redundant constraints. In the second state of the mechanism, external constraints act and in the scheme another five additional external repeating constraints are formed. Their contour arrangement and possible consequences of their action are shown. Originality. Structural analysis of the coupled crank-slider mechanism of the gripping device as a mechanism of a variable structure with internal and external connections is carried out for the first time. It is performed contour analysis, search and elimination, as well as reduction of pernicious repeated connections in the internal and external contour of the mechanism. Practical value. Practical recommendations have been developed on changing the mobilities of sliding pairs to eliminate all repeated connections in the internal contours of the mechanism. To reduce the number of pernicious repeated connections, the introduction of a self-centering unloading coupling into the external contour of the mechanism is proposed.

Author Biographies

R. P. Pogrebnyak, National Metallurgical Academy of Ukraine

Dep. «Applied Mechanics», National Metallurgical Academy of Ukraine, Haharina Av., 4, Dnipro, Ukraine, 49005, tel. +38 (091) 906 54 24, e-mail pogrebnyakk@ukr.net

M. R. Pohrebniak, National Technical University «Dnipro Polytechic»

Dep. «Automation and Computer Systems», National Technical University «Dnipro Polytechic», Dmytra Yavornytskoho Av., 19, Dnipro, Ukraine, tel. +38 (095) 499 75 01, e-mail mpogrebnyakk@gmail.com

References

Ozol, O. G. (1979). Osnovy konstruirovaniya i rascheta mekhanizmov. Riga: Zvaygzne. (in Russian)

Pogrebnyak, R. P., & Pohrebniak, M. R. (2020). Kinematic synthesis of the guide bearing central slide-crank mechanism of the gripping device based on the energetic motion transmission index. Science and Transport Progress, 1(85), 88-98. DOI: https://doi.org/10.15802/stp2020/199726 (in Ukranian)

Pogrebnyak, R. P. (2015). Poshuk ta usunennya nadlishkovikh zv'yazkiv u zakhoplyuyuchykh pristroyakh(zakhoplyuvachakh) mekhanizmiv manipulyatoriv. Metallurgicheskaya i gornorudnaya promyshlennost 7(296), 91-95. (in Ukranian)

Pogrebnyak, R. P. (2018). Repeated connections in the schemes of link slider-crank mechanism of gripping device. Science and Transport Progress, 4(76), 81-88. DOI: https://doi.org/10.15802/stp2018/140547 (in Ukranian)

Chelpanov, I. B., & Kolpashnikov, S. N. (1989). Skhvaty promyshlennykh robotov. Leningrad: Mashinostroyenie. (in Russian)

Artmann, V. N., Barrett, R. L. P., Martins, D., & Simon, R. (2019) Analysis and elimination of redundant constraints in clamping devices. 25th ABCM International Congress of Mechanical Engineering (COBEM 2019), 1-10. DOI: https://doi:10.26678/ABCM.COBEM2019.COB2019-1340 (in English)

Artmann, V. N., Barreto, R. L., Carboni, A. P., Simoni, R., & Martins, D. (2019). Type synthesis of self-aligning mechanisms applied to the leg rest section of an hospital bed. In IFToMM World Congress on Mechanism and Machine Science, 1413-1422. DOI: https://doi.org/10.1007/978-3-030-20131-9_139 (in English)

Barreto, R. L. P., Martins, D., Carboni, A. P., Simoni, R., & Dai, J. S. (2018). Self-aligning Analysis of the Metamorphic Palm of the KCL/TJU Metamorphic Hand. 2018 International Conference on Reconfigurable Mechanisms and Robots (ReMAR), 1-8. DOI: https://doi:10.1109/REMAR.2018.8449886 (in English)

Chang, C.-M., Gerez, L., Elangovan, N., Zisimatos, A., & Liarokapis, M. (2019), On Alternative Uses of Structural Compliance for the Development of Adaptive Robot Grippers and Hands. Frontiers in Neurorobotics,13(91), 1-16. DOI: https://doi:10.3389/fnbot.2019.00091(in English)

Carboni, A. P., Simas, H., & Martins, D. (2017). Analysis of Self-aligning Mechanisms by Means of Matroid Theory. Mechanisms and Machine Science, 54, 61-73. DOI: https:// doi.org/10.1007/978-3-319-67567-1_6 (in English)

Davies, T. (2006). Freedom and constraint in coupling networks. Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science, 220(7), 989-1010. DOI: https://doi:10.1243/09544062C09105 (in English)

Lu, Yi., Ye, N. J., & Lu, Y. (2012). Analysis and determination of associated linkage, redundant constraint, and degree of freedom of closed mechanisms with redundant constraints and/or passive degree of freedom. ASME Journal of Mechanical Design, 134(6), 1-9. DOI: https://doi:10.1115/1.4006525 (in English)

Monkman, G., Hesse, S., Steinmann, R., & Schunk, H. (2007). Robot grippers. Weinheim: Wiley-VCH. DOI: https://doi.org/10.1002/9783527610280 (in English)

Pogrebnyak, R. P. (2015). Structural analysis and rational design parallelogram arm gripping device. Theory and Practice Steel Industry, 1-2, 123-125. (in English)

Reshetov, L. (1986). Self-Aligning Mechanisms: Reference book. (Sachs L. (transl.)). Moscow: Mir. (in English)

Pham, D. Т., & Haginbotham, W. B. (Eds.). (1986). Robot Grippers (International trends in manufacturing technology). Bedford: IFS. (in English)

Schlenoff, C., Balakirsky, S. & Christensen, H. (2018). Robust grasp preimages under unknown mass and friction distributions. Integrated Computer-Aided Engineering, 25(2), 99-110. DOI: https://doi:10.3233/ICA-180568 (in English)

Shintake, J., Cacucciolo, V., Floreano, D., & Shea, H. (2018). Soft Robotic Grippers. Advanced Materials, 30(29), 1-33. DOI: https://doi:10.1002/adma.201707035 (in English)

Tai, K., El-Sayed, A.R., Shahriari, М., Biglarbegian, М., & Mahmud, S. (2016). State of the Art Robotic Grippers and Applications. Robotics, 5(11), 1-20. DOI: https://doi:10.3390/robotics5020011 (in English)