The optimization of parameters of a safety element of the finger mechanism of the header auger of a combine harvester

Abstract

BACKGROUND: One of the most frequently recorded failures of structural elements of the header auger of a combine harvester is the failure of the fingers of the finger mechanism. Many manufacturers of grain harvesting equipment introduce a safety element into the design of the finger mechanism which is a groove on the finger. The optimal location of this groove with relation to the axis of rotation of the pin allows to ensure the breakage of the auger finger not along the main diameter but along the groove at a certain section of the working stroke of the mechanism.

AIMS: In the specific technical literature, no special attention is paid to the analytical calculations of the structural elements of the finger mechanism of the header auger that requires the development of appropriate mathematical models depending on the targets.

METHODS: This paper presents a mathematical model of the finger mechanism of the header auger of a combine harvester, based on the use of vector analysis, which has been successfully used by the author for a long time in the development of various lever mechanisms. The proposed vector analysis method is based on the coordinate transformation method.

RESULTS: The mathematical model of the finger mechanism of the auger presented in the article made it possible to describe the kinematics of all of its hardpoints, to determine the vectors of angular velocities and accelerations of the links, to carry out a force analysis with optimization of the position of the safety element on the finger as well as to obtain and to study various graphical dependencies. The developed mathematical model provides a comprehensive description of the kinematic and force parameters of the considered mechanism for all of its positions.

CONCLUSIONS: The presented mathematical model of the finger mechanism made it possible to successfully optimize the parameters of the location of the safety element on the finger - the groove, thereby ensuring the maximum angle of coverage of the zone of possible breakage of the finger along the groove.

Keywords

finger / finger mechanism / auger / safety element / header / combine harvester / vector analysis / the principle of possible velocities / optimization

References

[1] Kotov AV, Chuprynin YuV. Application of vector analysis in the design of lever mechanisms. In: Scientific and technical progress in agricultural production: materials of the international. scientific-practical. conf. Minsk; 2007:32–37.

[2] Котов А.В., Чупрынин Ю.В. Применение векторного анализа при проектировании рычажных механизмов // Научно-технический прогресс в сельскохозяйственном производстве: материалы междунар. науч.-практ. конф. Минск, 2007. С. 32–37.

[3] Kotov AV, Chuprynin YuV. Application of vector analysis to optimize the drive mechanism of the grain cleaning system of a combine harvester during its design. Mekhanika mashin, mekhanizmov i materialov. 2009;2(7):43–48.

[4] Котов А.В., Чупрынин Ю.В. Применение векторного анализа для оптимизации механизма привода системы очистки зерна зерноуборочного комбайна при его проектировании // Механика машин, механизмов и материалов. 2009. № 2(7). С. 43–48.

[5] Bertyaev VD. Theoretical mechanics based on MathCAD: workshop. Saint Petersburg: BKhV-Peterburg; 2005.

[6] Бертяев В.Д. Теоретическая механика на базе MathCAD: практикум. Санкт-Петербург: БХВ-Петербург, 2005.

[7] Merko MA, Kolotov AV, Mesnyankin MV. et al. Theory of mechanisms and machines. Lever mechanisms: workshop. Krasnoyarsk: Sib. feder. un-t; 2016.

[8] Мерко М.А., Колотов А.В., Меснянкин М.В. и др. Теория механизмов и машин. Рычажные механизмы: практикум. Красноярск: Сиб. федер. ун-т, 2016.

[9] Dyuzhev AA, Kotov AV, Chuprynin YuV. Ensuring the universality of the hinged device of the power facility UES-2-250A “Polesye” in order to create modular-type agricultural units. In: Energy-saving technologies and technical means in agriculture. production: dokl. intl. scientific-practical. conf.: in 2 parts. Minsk; 2008;1:78–74.

[10] Дюжев А.А., Котов А.В., Чупрынин Ю.В. Обеспечение универсальности навесного устройства энергосредства УЭС-2-250А «Полесье» с целью создания сельскохозяйственных агрегатов модульного типа // Энергосберегающие технологии и технические средства в с.-х. производстве: докл. междунар. науч.-практ. конф.: в 2 ч. Минск, 2008. Ч. 1. С. 78–74.

[11] Bobyrenko SV, Kotov AV. Simulation of the process of operation of the mechanism for pre-pressing the feeding apparatus of a forage harvester. Vestnik BRU. 2010;1(30):18–26.

[12] Бобыренко С.В., Котов А.В. Моделирование процесса работы механизма подпрессовки питающего аппарата кормоуборочного комбайна // Вестник БРУ. 2010. № 1(30). С. 18–26.

[13] Rekhlitsky OV, Dzhasov DV, Trukhanovich SV. Synthesis of balancing mechanisms with gas springs using vector analysis. In: Topical issues of mechanical engineering: a collection of scientific papers. Minsk;2013;2:106–110.

[14] Рехлицкий О.В., Джасов Д.В., Труханович С.В. Синтез механизмов уравновешивания с газовыми пружинами с использованием векторного анализа // Актуальные вопросы машиностроения: сборник научных трудов. Минск, 2013. Вып. 2. С. 106–110.

[15] Kolovsky MZ, Evgrafov AN, Semenov YuA. et al. Theory of mechanisms and machines: textbook. allowance for students. Moscow: Akademiya; 2008.

[16] Коловский М.З., Евграфов А.Н., Семенов Ю.А. и др. Теория механизмов и машин: учеб. пособие для студ. высш. учеб. заведений. М.: Академия, 2008.

[17] Savchuk VP, Medvedev DG, Vyarvilskaya ON. Theoretical mechanics: textbook. Minsk: BGU; 2016.

[18] Савчук В.П., Медведев Д.Г., Вярьвильская О.Н. Теоретическая механика: учебник. Минск: БГУ, 2016.

[19] Chernaya LA. Kinematic and kinetostatic study of flat lever mechanisms in MathCAD and AutoCAD systems: guidelines for homework on the theory of mechanisms and mechanics of machines. Moscow: MGTU im. NE Baumana; 2017.

[20] Черная Л.А. Кинематическое и кинетостатическое исследование плоских рычажных механизмов в системах MathCAD и AutoCAD: методические указания к выполнению домашнего задания по теории механизмов и механике машин. М.: Изд-во МГТУ им. Н.Э. Баумана, 2017.

[21] Reznik NE. Forage harvesters. Moscow: Mashinostroenie; 1980.

[22] Резник Н.Е. Кормоуборочные комбайны. М.: Машиностроение, 1980.

[23] Turbin BG, Lurie AB, Grigoriev SM. et al. Agricultural machines: Theory and technological calculation. Leningrad: Mashinostroenie; 1967.

[24] Турбин Б.Г., Лурье А.Б., Григорьев С.М. и др. Сельскохозяйственные машины: Теория и технологический расчет. Л.: Машиностроение, 1967.

RIGHTS & PERMISSIONS

Eco-Vector