Purpose: Development of a computational model of stress-strain state bearing elements of trailer frames for preliminary assessment and identification of areas with increased risk of failure. Design/methodology/approach: The object of the study is the processes of loading the load-bearing metal structures of trailers - fertilizer spreaders. The stress-strain state of the spreader bearing system is investigated for the established three typical cases of external load. To refine the values obtained as a result of modelling, they were determined in SOLIDWORKS. Findings: Computational models of load have been compiled by improving the method of minimum potential deformation energy for its effective correct use in analytical studies of a similar type of metal structures. It is proved that for a flat closed frame structure made of thin-walled profiles, loaded with forces perpendicular to the plane of the frame, the levelling of compression and shear energies, as well as axial and transverse forces and bending moments in the horizontal plane does not significantly affect the calculation results. Research limitations/implications: Horizontal components of the shear forces as well as the normal forces and as a consequence the corresponding potential deformation energy are neglected, which has some effect on the accuracy of the calculations. Practical implications: An effective tool for strength analysis with preliminary assessment and diagnostics of load-bearing metal structures based on the constructed calculation models of stress strain state load-bearing frames of typical geometry with an arbitrarily given distribution of external load. Originality/value: A universal algorithm for recording additive functions of bending and torques, as well as the potential deformation energy of welded frames of trailers.
The article presents the results of theoretical and experimental studies of the process of moving bulk material in the inactive zone between hinged screw sections of a flexible screw conveyor. The influence of the gap between the edges of adjacent screw sections and the magnitude of their circular displacement on the process of continuous transportation of bulk material is presented. The results of theoretical and experimental studies are compared. This will allow choosing the optimal design, kinematic and technological parameters of the developed sectional screw working body when transporting bulk agricultural materials along curved paths, both in horizontal and inclined directions, as well as along curved paths.
Процеси завантаження фруктами та овочами складських приміщень у тарі потребують забезпечення вимог, які до них висуваються. Проведений аналіз літературних джерел та конструктивно-технологічних схем установок для завантаження малих складських приміщень овочами та фруктами у тарі та виявлені їх недоліки з визначенням перспективних напрямів досліджень. Розроблена експериментальна установка двоканатного механізму, наведена методика проведення його досліджень і прилади, які застосовувались під час експериментів. Описано роботу електронного динамометра під час проведення експериментальних досліджень. На основі запропонованих технічних рішень та виготовленого канатного механізму для завантаження складських приміщень овочами та фруктами у тарі на експериментальній установці проведені дослідження з визначення взаємозв’язку між його конструктивними, кінематичними та силовими параметрами. Представлені конкретні числові значення співвідношень зусиль навантаження важелів, різного положення кріплення пружин та величини їх деформації. Запропоновані рекомендації стосовно вибору раціональних параметрів канатного механізму для якісного виконання технологічного процесу залежно від кута нахилу пари канатів до горизонту, маси та швидкості переміщення вантажів від зони їх завантаження до зони вивантаження та інших регульованих параметрів.
The article presents the developed design of the pneumatic-screw conveyor, as well as its experimental installation. The method of conducting experimental researches to determine force indicators at movement of different types of loose materials under the influence of air pressure and their volume of various types of bulk materials. Based on the conducted experimental studies, the response surfaces and two-dimensional cross-sections of the pneumatic-screw conveyor productivity when the material passes from the whole area in the hopper transition zone to the screw feeder, its rotation frequency and the working air pressure in the process line have been constructed.
Screw conveyors are widely used in various sectors of the economy determining specific requirements for them. One of such requirements is the possibility of safe movement of brittle elements and products with possible increased damage (injury) in pharmaceutical industry, electronics, food industry, as well as in agricultural production during the transportation of seed grain materials. The theoretical substantiation of the increase of efficiency of bulk cargoes transportation by screw conveyors is given in this paper. The problem of their progressive structures development with the possibility of minimal damage of grain materials remains important. The paper presents Recommendations for the auger rotation speed selection in order to minimize the damage of brittle elements and products are presented in this paper. The rational angle at which productivity of the screw conveyor reaches its maximum values is deteermined.
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