Calculation of the Friction Coefficients of Flax Stems according to their Roughness Characteristics

Черников, В. Г.; Rostovtsev, R.A.; Popov, Roman Andreevich; Romanenko, V. I.; Rostovtsev, A.

doi:10.22314/2073-7599-2018-13-1-41-47

Cited by 4 publications

(2 citation statements)

References 2 publications

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“…GRAIN HARVESTING MACHINERY Л ьноуборочные машины работают в условиях изменяющихся внешних воздействий, что сказывается на производительности машин, качестве выполнения технологических процессов и конечного продукта [1,2]. Актуальна задача комплексного исследования условий работы, динамических свойств и качества работы льноуборочных машин на основе проведения широких полевых испытаний, обработки и анализа большого количества первичной информации [3,4,[18][19][20][21].…”

Section: зерноуборочная техникаunclassified

Flax Harvesting Technologies for Flax Harvesting Machines

2023

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The technology of flax harvesting depends on input impacts, including: flax harvester qualitative characteristics; working body parameters; indicators of working conditions; intervening variables reflecting the dynamic properties of the working bodies and the dynamics of the flax flow input. (Research purpose) To establish patterns and the degree of correlation between the qualitative operation indicators (pulling and deseeding quality, flax line stretching); design parameters; machine dynamic properties and harvesting conditions (height and density of flax stem, field surface, thickness and unevenness of flax straw, etc.). (Materials and methods) Based on system analysis, mathematical models of the technological process of flax harvesting were developed. Information models were introduced for examining the main flax harvesters. (Results and discussion) The paper shows that the most typical indicators of the flax harvester working conditions are the flax stem height l(t), centimeters; the seed pod area a(t), centimeters; and field surface roughness z(t), centimeters. It is found that the quality of operation is determined by the deseeding quality, percentages; the flax straw stretching, times; the location of its apical and root parts, centimeters. The estimated indicators are as follows: the pulling height h(t), centimeters, the vibrations of the combine in the longitudinal-vertical plane Q(t), degrees, the location of the apical part of the flax flaw in front of the stripper. (Conclusions) A hydraulic device was developed to adjust the pulling height from 10 to 40 centimeters, depending on the flax stem. An important reserve for increasing the deseeding quality is the change in the width of the deseeding zone of the Vk harvester, centimeters. For this purpose, a mechanism was created for moving the deseeder against the clamping conveyor, depending on the flax stem height l(t), centimeters.

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Section: зерноуборочная техникаunclassified

Flax Harvesting Technologies for Flax Harvesting Machines

2023

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“…Задача совершенствования машин, создания новых рабочих органов для очеса и выделения коробочек и семян льна-долгунца является актуальной. Однако ее реализация сдерживается отсутствием научно обоснованных конструкторских и технологических решений [1][2][3].…”

Section: инновационные технологии и оборудование Innovative Technolog...unclassified

Technology and implementation of flax stripping in the primary flax processing line

Rostovtsev,

Chernikov,

Solovyov

et al. 2023

S-h. maš. tehnol.

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This paper investigates the utilization of an oscillatory-type working body for the stripping process within the primary ﬁber ﬂax processing line. It also introduces the equation governing the movement of this working body, thereby enabling the determination of the fundamental geometric parameters of the mechanism. (Research purpose) To develop the technology for ﬁber ﬂax stripping at a ﬂax mill using the proposed comb-type device, and to examine the parameters and modes of its functionality. (Materials and methods) A testing model was designed for a stripping machine, enabling an exploration of the ﬂax combing process within the factory. The limitations of the parameters under investigation were identiﬁed. Furthermore, a theoretical model was formulated to calculate the performance of the stripper. (Results and discussion) The operation kinematic mode, stripping cleanliness, and seed losses during the stripping process are determined through theoretical analysis. It is discovered that the quality of stripping is inﬂuenced by the thickness of the ﬂax ribbon. Speciﬁcally, an increase in the ﬂax straw's thickness results in the clogging of the stripping device, subsequently leading to the formation of tangles and entanglements on the working body. On the other hand, insuﬃcient thickness of the ﬂax ribbon leads to signiﬁcant damage to the stems. The limits for the thickness of the ﬂax ribbon are established considering both the potential minimum and maximum yields: the lower limit being 0.01 meters and the upper limit set at 0.05 meters. The application of the factory's stripping technology is expected to ensure a 10 percent reduction in seed losses and an additional 6 percent reduction in production costs. (Conclusions) Theoretical justiﬁcation for the parameters and operational modes of the stripper in the ﬂax processing line, along with its design, is provided. The feed speed of the ﬂax ribbon is conﬁgured to range between 1.0 and 1.5 meters per second, while the rotation frequency of the working body varies from 2.2 to 3.0 revolutions per second.

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Physico-Mechanical Properties of Pumpkin Seeds in the Context of Drying Processes

Pastukhov,

Dobritskiy,

Bakharev

et al. 2024

S-h. maš. tehnol.

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The paper highlights the significance of the drying process in post-harvest cucurbit seed treatment technology. To improve the eﬀectiveness of drying high-moisture seeds, a plant construction design was introduced, incorporating the concept of providing varied heat distribution to a vigorously agitated seed layer. The paper validates the necessity of refining the dimensional, frictional, and aerodynamic properties of pumpkin seeds to determine the optimal operating modes for the proposed dryer. (Research purpose) To identify the physical and mechanical properties of pumpkin seeds by defining their dimensional, frictional and aerodynamic characteristics. (Materials and methods) The study employs one-factor experimental research methods with subsequent statistical data processing. An experimental study was conducted on the physical and mechanical properties of Volzhskaya Grey pumpkin seeds possessing a standard moisture content ranging between 9.3 and 9.7 percent. Well-known laboratory apparatuses, namely the «conical tank» and the «inclined plane», were used to determine the natural repose angle and to enhance the accuracy of friction coeﬃcients determination. For analyzing the aerodynamic properties of the seeds, the K-293 Petkus air separator was employed. (Results and discussion) Research methods were developed and experimental plants were described. It was established that with a probability confidence level of 0.95, the static friction coeﬃcients of pumpkin seeds on a solid steel sheet, a perforated steel sieve and on rubber are 0.473, 0.418, 0.481, respectively, and the dynamic friction coeﬃcients under the identical conditions are measured as 0.331, 0.293, 0.337. The average angle of natural repose is found to be 22 degrees, the midsection area is 97.94 square millimeters, the soaring velocity is 7.083 meters per second, the windage coeﬃcient stands at 0.196 and the aerodynamic drag coeﬃcient is 0.136. (Conclusions). The assumption that enhancing the drying eﬃciency of vegetable seeds can be achieved by implementing a diverse thermal energy supply to continuously moving mass inside the apparatus is confirmed, provided that the seeds do not stick together in layers resulting in blockage of the coolant flow. An improved design of the dryer configurations has been developed and, to validate its optimum design and technological specifications, an in-depth analysis of the seeds' dimensional, frictional, and aerodynamic attributes has been conducted.

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Calculation of the Friction Coefficients of Flax Stems according to their Roughness Characteristics

Cited by 4 publications

References 2 publications

Flax Harvesting Technologies for Flax Harvesting Machines

Flax Harvesting Technologies for Flax Harvesting Machines

Technology and implementation of flax stripping in the primary flax processing line

Physico-Mechanical Properties of Pumpkin Seeds in the Context of Drying Processes

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