Development and theoretical studies of grain cleaning machine for fractional technology of flattening forage grain

Savinyh, Peter; Sychugov, Y. V.; Казаков, В. А.; Ivanovs, Semjons

doi:10.22616/erdev2018.17.n156

Cited by 21 publications

(20 citation statements)

References 4 publications

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“…In such fl ows, light particles move (are separated) by the air fl ow due to the aerodynamic drag force, which exceeds the gravitational force, the cause of which is the difference in air velocity and particle. Heavy particles mostly move (separated from the light ones) under the action of gravity, while the aerodynamic drag force acts slightly [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18]. The force of aerodynamic drag is determined by the expression: (1) where C D is the aerodynamic drag coeffi cient of the particle, ρ g is the air density, kg / m 3 (ρ = 1.225 kg / m 3 ); d р -particle diameter, m; U is the air fl ow speed created by the fan, m / s; V -particle velocity, m / s. (6) The aerodynamic drag coeffi cient of spherical particles C D is determined according to the Rayleigh curve depending on the Reynolds number Re (C D = f (Rе)) [1][2][3].…”

Section: Methodsmentioning

confidence: 99%

“…and light impurities (husks, small weed seeds, etc.) occurs by airfl ow [1][2][3][4][5]. However, modern grain cleaning machines for preliminary cleaning of grain pile with a pneumatic system as their main working element, in their operational qualities do not fully meet the increasing requirements of modern agricultural production [6][7][8][9].…”

Section: The Problem Statementmentioning

confidence: 99%

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Mathematical modeling of the grain material separation in the pneumatic system of the grain-cleaning machine

Badretdinov¹,

Мударисов²,

Tuktarov³

et al. 2019

J Appl Eng Science

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The article presents the results of a study of a high-performance grain cleaning machine for the preliminary cleaning of grain pile with a closed aspiration system. The fl ow regimes of the "air-grain pile" mixture determined by the Reynolds number and the bulk concentration of particles are established. As a result of the modeling, further directions for improving pneumatic systems of grain cleaning machines were determined: the cleaning effi ciency of the Е 0 fraction of pure grain from light impurities, shriveled and crushed grain reaches 82%, the output cleanliness of the grain was 93.7%, and the loss of full grain to waste P z = 0,017%. The average speed of the air fl ow in the separating channel is U = 7.12 m/s, its coeffi cient of variation across the width of the separating channel is v = 12,7%. The results of the experimental data confi rmed the adequacy of using mathematical modeling of the air fl ow in the pneumatic system of a grain cleaning machine to substantiate the basic parameters of the pneumatic system.

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Section: Methodsmentioning

confidence: 99%

Section: The Problem Statementmentioning

confidence: 99%

Mathematical modeling of the grain material separation in the pneumatic system of the grain-cleaning machine

Badretdinov¹,

Мударисов²,

Tuktarov³

et al. 2019

J Appl Eng Science

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“…Therefore, seed sorting methods are being continuously improved by searching for new separation traits and designing new equipment [17]. Seed mixtures are separated in a stream of air in specialized pneumatic cleaners as well as in simpler threshing machines [18][19][20][21][22]. Air flow is frequently used to separate seeds because pneumatic devices have a simple structure and are easy to operate.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Selected Factors on Separation Efficiency in a Pneumatic Conical Separator

et al. 2020

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Pneumatic separation is one of the available methods for cleaning seed mixtures. Variously shaped seeds, including spherical (vetch), elongated (wheat), and pyramid-shaped seeds (buckwheat), were analyzed in this study. A seed mixture containing 80% of main crop seeds and 20% of other crop seeds imitating impurities was separated in a pneumatic separator with the shape of an inverted cone in a stream of air. The regression equations describing the separation efficiency of the main crop seeds and other crop seeds imitating impurities (η) and the separation efficiency index (ε) were characterized by high and very high fit to empirical data. The coefficient of determination for the analyzed seed mixtures ranged from 0.71 to 0.99. The conical separator supported effective separation of seed mixture components in a stream of air.

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“…Поэтому результаты по скорости падения зерновки в жидкость были в последующих расчетах выполнены в соответствии с данной точностью. Обработка полученных теоретических и экспериментальных данных проведена на персональном компьютере при помощи пакета программ офисной документации по статистической обработке информации Microsoft Excel 2013 и специальной программы по статистической обработке данных Sigma Plot 8.0 8 .…”

Section: Introductionunclassified

Investigation of Grain Movement Parameters in the Liquid of the Device for Removing Ergot

Сысуев

Saitov

Farafonov

et al. 2019

Engineering Technologies and Systems

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Introduction.When harvesting grain crops, various trash and harmful impurities come to the combine bunker together with grains. These harmful impurities include egot sclerotia, which are poisonous. Various modern grain cleaning machines do not provide for complete separation of ergot sclerotia from grains, because of the closeness of their linear dimensions (width, thickness and length) and speed of soaring. Cleaning seeds from ergot sclerotia having the density less than density of grain, is possible in an aqueous solution of salt. For the mechanization of the allocation of sclerotium ergot from rye seeds by a wet method, the urgent issue is the development of a device for cleaning grain material. Materials and Methods.The immersion of separately taken rye grains in water (ρzh = 1,0 ∙ 103 kg/m3) and aqueous solutions of sodium chloride (NaCl) with density ρzh = 1,09 ∙ 103 kg/m3 and 1,15 ∙ 103 kg/m3. The ellipsoid is taken as the geometric model of the grains. Theoretical studies were performed for the grain density ρz from 1,2 ∙ 103 kg/m3 to 1,5 ∙ 103 kg/m3, lengths lz from 5,0 ∙ 10–3 m to 10,0 ∙ 10–3 m, width b from 1,4 ∙ 10–3 m to 3,6 ∙ 10–3 m, and thickness δ from 1,2 ∙ 10–3 m to 3,5 ∙ 10–3 m based on the methods of mathematical modelling using the laws of hydrodynamics. For practical experiments, there was chosen the gains of the winter rye variety Falenskaya 4 having the gain density ρz from 1,1 ∙ 103 kg/m3 to 1,3 ∙ 103 kg/m3, length lz from 5,0 ∙ 10–3 m to 8,0 ∙ 10–3 m, width b from 1,4 ∙ 10–3 m to 3,6 ∙ 10–3 m, and thickness δ from 1,2 ∙ 10–3 m to 3,5 ∙ 10–3 m. Results. The speed ʋz and duration tп of grain immersion in liquids are main parameters taken into account when developing a machine for cleaning the grain material from ergot sclerotia with a wet method. The values of these quantities determine the structural and technological parameters of the machine under developing. To determine these parameters, it is necessary to take into account the geometric shapes of the grains, which have a large variety. An ellipsoid with a small 2cz = δ, an average 2bz = b and a large 2az = lz axes is proposed as the closest to the shape of the grain. From the basic law of the dynamics of the grain movement in liquids of various densities ρzh a formula was obtained for determining its velocity, the calculated values for which are consistent with the experimental data obtained. Discussion and Conclusion. It is established that the calculated values of the speed of grain immersion in liquids of different density are comparable with the experimental values of the same order. They are close and differ by no more than 10 %. This approach to determining the speed of grain immersion in a liquid can be used in developing a machine for cleaning a grain material with the wet method to substantiate its structural and technological parameters.

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Development and theoretical studies of grain cleaning machine for fractional technology of flattening forage grain

Cited by 21 publications

References 4 publications

Mathematical modeling of the grain material separation in the pneumatic system of the grain-cleaning machine

Mathematical modeling of the grain material separation in the pneumatic system of the grain-cleaning machine

The Effect of Selected Factors on Separation Efficiency in a Pneumatic Conical Separator

Investigation of Grain Movement Parameters in the Liquid of the Device for Removing Ergot

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