621.855

rod conveyor, sleeve-roller chain, contact stresses, work resource, mathematical model, rod, sleeve, tribocoupling.

The service life and durability of transport and assembly machines depends on structural, technological and operational factors. The wear and tear of parts and working bodies causes a violation of the level and stability of the fulfillment of technical requirements, a decrease in reliability and efficiency, and a reduction in the service life of machines. Any technical means, in particular agricultural ones, can be considered as a system of serially or parallel connected units, aggregates and elements operating under conditions of load dynamics and wear and tear. The failure of one of the elements of the friction unit leads to the loss of its performance. The result is a complete or partial loss of machine performance as a whole. The most rational way to increase the durability of machines is to reduce wear and tear. This can be achieved by developing methods for evaluating the wear of friction parts. The paper proposes a model for evaluating the wear of the rod head-sleeve conjugation of the conveyor traction body of the rod conveyor of root-harvesting machines. The developed model of the tribosystem provides an opportunity to determine the estimated service life of the bars, that is, the conveyor as a whole. The geometric, kinematic and power factors affecting the wear processes of the tribo coupling under study were analyzed. The assessment of the maximum contact stresses of the contacting surfaces of the tribocoupler was performed to prevent premature destruction. The evaluation was performed in the initial stage of the transport machine, when the contact areas are minimal. The average statistical stresses arising in the contact zones, at which the wear process reaches critical values, are determined. Such studies make it possible to unify the dependence for determining the service life of a rod conveyor based on a sleeve-roller chain. Taking into account that the contact stresses depend on the force and geometric parameters, it is advisable to use the obtained mathematical model for the design of the rod-sleeve connection structures to ensure the specified service life of the mechanism.

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2. Hevko R. B., Tkachenko I. G., Rohatynskyi R. M., Synii S. V., Gladyo Y. B., Gradovy V. V., (2020) Systems of post-cleaning of Korean fruits during their mechanized harvesting: monograph. Ternopil: Osadtsa Yu. V. 216 p.
3. Dovbush T. A., Dovbush A. D., Khomyk N. I., (2014). Modyfikatsiia MMPED dlia rozkryttia statychnoi nevyznachenosti kryvoliniinykh elementiv ram [Modification of MMPED to disclose static uncertainty of curvilinear frame elements] "Tekhnichnyi servis dlia mashyn dlia roslynnytstva" Visnyk KhNTUSH im. P. Vasylenka. Kh.: KhNTUSH, рр.105–110.
4. Dovbush T., Khomyk N., Dovbush A., Dunets B., (2019) Evaluation technique of frame residual operational life. Scientific Journal of TNTU (Tern.), vol. 93, no. 1, рр. 61–9.
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6. Trokhaniak O. M., Hevko R. B., Lyashuk O. L., Pohrishchuk B. V., Dobizha N. V., Dovbush T. A. (2020) Research of the of bulk material movement process in the inactive zone between screw sections, INMATEH-agricultural engineering, vol. 60, no. 1, рр. 261–268. Doi: 10.35633/inmateh-60-29.
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9. Dovbush T. A, Khomyk N. I., Babii A. V., Tsyon G. B., Dovbush A. D. Resistance of materials: a study guide for calculation and graphic work and independent work. Ternopil: individual-entrepreneur Palyanytsia V.A., 2022. 220 p.
10. Khomyk N. I., Dovbush T. A. Justification of power factors of loading of rod conveyors. Processes, machines and equipment of agro-industrial production: problems of theory and practice: coll. abstracts of international reports science and practice conf. dedicated to the 90th anniversary of the birth of Professor Tymofiy Ivanovich Rybak and the 60th anniversary of the Department of Technical Mechanics and Agricultural Machinery, (Ternopil, September 29–30, 2022.) / Ministry of Education and Science of Ukraine, Ternopil. the nation technical University named after I. Pulyuya [and others]. Ternopil: individual-entrepreneur Palyanitsa V. A., 2022. Рp.140–141.
11. Khomyk N. I., Tson G. B., Dovbush T. A., Antonchak N. A. Basics of agronomy: a study guide for practical classes and independent work. Ternopil: individual-entrepreneur Palyanitsa V. A., 2021. 320 p.
12. Khomyk N. I., Tson G. B., Dovbush T. A., Oleksyuk V. P. Basics of agronomy: textbook (course of lectures). Ternopil: individual-entrepreneur Palyanitsa V. A., 2021. 232 p.
13. Khomyk N. I., Rybak T. I., (2002) Development of a model for assessing the stress-strain state of elements of rod conveyors of beet-harvesting machines. Mechanical science, no. 6, pр. 25–27.
14. Khomyk N. I. (2002) A calculation model for evaluating the wear of the heads of the conveyor belt rods. Mechanical science, no. 12, pp. 49–51.
15. Khomyk N. I., Research of rod conveyors of root-harvesting machines taking into account the characteristics of the load: dis... Ph.D. technical Sciences: 05.05.11. Ternopil: TDTU, 2003. 180 p.
16. Khomyk N. I., Dovbush T. A., Dovbush A. D., 2023. Analysis of the stress state in the contact zones of rod conveyor fasteners. Problems of design, production and operation of agricultural machinery: materials of the XIV International science and practice conf. Kropyvnytskyi, November 8–10. Kropyvnytskyi: Central Ukrainian National Technical University, рр. 44–46.

1. Babii A., Dovbush T., Khomuk N., Dovbush A., Tson A., Oleksyuk V., (2022) Mathematical model of a loaded supporting frame of a solid fertilizers distributor. Procedia Structural Integrity, no. 36, рр. 203–210. Science Direct. Available at: https://doi.org/10.1016/j.prostr.2022.01.025.
2. Hevko R. B., Tkachenko I. G., Rohatynskyi R. M., Synii S. V., Gladyo Y. B., Gradovy V. V., (2020) Systems of post-cleaning of Korean fruits during their mechanized harvesting: monograph. Ternopil: Osadtsa Yu. V. 216 p.
3. Dovbush T. A., Dovbush A. D., Khomyk N. I., (2014). Modyfikatsiia MMPED dlia rozkryttia statychnoi nevyznachenosti kryvoliniinykh elementiv ram [Modification of MMPED to disclose static uncertainty of curvilinear frame elements] "Tekhnichnyi servis dlia mashyn dlia roslynnytstva" Visnyk KhNTUSH im. P. Vasylenka. Kh.: KhNTUSH, рр.105–110.
4. Dovbush T., Khomyk N., Dovbush A., Dunets B., (2019) Evaluation technique of frame residual operational life. Scientific Journal of TNTU (Tern.), vol. 93, no. 1, рр. 61–9.
5. Rybak T. I., Popovych P. V., Khomyk N. I., Dovbush T. A., Tson H. B., (2013). Imitatsiine modeliuvannia pry rozrakhunkakh na kvazistatychnu mitsnist konstruktyvnykh struktur vazhko navantazhenykh silskohospo-darskykh mashyn [Simulation calculations on quasi-static strength structural structures are heavily loaded with agricultural machinery] Problemy nadiinosti mashyn ta zasobiv mekhanizatsii silskohospodarskoho vyrobnytstva Visnyk  KhNTUSH im. P. Vasylenka. Kh.: KhNTUSH., рр. 321–326.
6. Trokhaniak O. M., Hevko R. B., Lyashuk O. L., Pohrishchuk B. V., Dobizha N. V., Dovbush T. A. (2020) Research of the of bulk material movement process in the inactive zone between screw sections, INMATEH-agricultural engineering, vol. 60, no. 1, рр. 261–268. Doi: 10.35633/inmateh-60-29.
7. Hevko R. B., Tkachenko I. G, Khomyk N. I., Gumeniuk Y. P., Flonts I. V., Gumeniuk O. O. (2020) Determination of technical-and-economic indices of root crop conveyer-separator during their motion on curved path. IMMATEH: Agricultural engineering, vol. 61, no. 2, pp. 175–182.
8. Dovbush T., Khomyk N., Dovbush A., Palyukh A. (2022) Estimation of the load capacity and the strain-stress state of rod transporters. Scientific Journal of the Ternopil national technical university, vol. 108, no. 4, pр. 5–15.
9. Dovbush T. A, Khomyk N. I., Babii A. V., Tsyon G. B., Dovbush A. D. Resistance of materials: a study guide for calculation and graphic work and independent work. Ternopil: individual-entrepreneur Palyanytsia V.A., 2022. 220 p.
10. Khomyk N. I., Dovbush T. A. Justification of power factors of loading of rod conveyors. Processes, machines and equipment of agro-industrial production: problems of theory and practice: coll. abstracts of international reports science and practice conf. dedicated to the 90th anniversary of the birth of Professor Tymofiy Ivanovich Rybak and the 60th anniversary of the Department of Technical Mechanics and Agricultural Machinery, (Ternopil, September 29–30, 2022.) / Ministry of Education and Science of Ukraine, Ternopil. the nation technical University named after I. Pulyuya [and others]. Ternopil: individual-entrepreneur Palyanitsa V. A., 2022. Рp.140–141.
11. Khomyk N. I., Tson G. B., Dovbush T. A., Antonchak N. A. Basics of agronomy: a study guide for practical classes and independent work. Ternopil: individual-entrepreneur Palyanitsa V. A., 2021. 320 p.
12. Khomyk N. I., Tson G. B., Dovbush T. A., Oleksyuk V. P. Basics of agronomy: textbook (course of lectures). Ternopil: individual-entrepreneur Palyanitsa V. A., 2021. 232 p.
13. Khomyk N. I., Rybak T. I., (2002) Development of a model for assessing the stress-strain state of elements of rod conveyors of beet-harvesting machines. Mechanical science, no. 6, pр. 25–27.
14. Khomyk N. I. (2002) A calculation model for evaluating the wear of the heads of the conveyor belt rods. Mechanical science, no. 12, pp. 49–51.
15. Khomyk N. I., Research of rod conveyors of root-harvesting machines taking into account the characteristics of the load: dis... Ph.D. technical Sciences: 05.05.11. Ternopil: TDTU, 2003. 180 p.
16. Khomyk N. I., Dovbush T. A., Dovbush A. D., 2023. Analysis of the stress state in the contact zones of rod conveyor fasteners. Problems of design, production and operation of agricultural machinery: materials of the XIV International science and practice conf. Kropyvnytskyi, November 8–10. Kropyvnytskyi: Central Ukrainian National Technical University, рр. 44–46.