Mansour RASEKH, Hadi BAGHERI, Mohammad Hossien KIANMEHR, Shahriar KOURAVAND

A Study of Some Physical Properties of Lentil and Wild Oat Weed and Parameters Affecting the Separation of Wild Oat Weed from Lentil by a Gravity Table Separator

Bu çalışmada, mercimek ve yabani yulaf tohumlarının 1000 tane ağırlığı, gerçek yoğunluğu, porozitesi ve statik sürtünmekatsayıları belirlenmiştir. Yabani yulaf tohumlarının mercimek tohumlarından ayrılmasında gravite masa selektörü kullanılmıştır. Gravite masa selektörü ayarlanabilir boylam açısı, enlem açısı, amplitüd titreşim, titreşim frekansı ve havahızı olmak üzere 5 özelliğe sahiptir. Yabani yulaf tohumunun mercimek tohumundan ayrılmasını en iyi hale getirmeküzere bu özelliklerin etkisi araştırılmıştır. Çalışmadan elde edilen sonuçlar masaya göre enlem açısının 0.5° ila 1°,boylam açısının ise 1.5° ila 2° artırılmasının yabani yulaf tohumlarının mercimek tohumlarından ayrılmasını artırdığınıgöstermiştir. Boylam açısının 2°, enlem açısının 1°, amplitüd titreşimin 5 mm, titreşim frekansının 400 titreşim dak-1ve hava hızınıın 5.7 m s-1 olması durumunda ayırma % 37 olmuştur. Sonuç olarak; en uygun amplitüd titreşim ve havahızı ayarları belirlendikten sonra enlem ve boylam açı bilgileri Datafit programı kullanılarak yabani yulaf tohumlarınınmercimek tohumlarından ayrılmasında matematik ilişkiler hesaplanmıştır.

Mercimek ve Yabani Yulaf Tohumlarının Kimi Fiziksel Özellikleri ve Gravite Masa Selektörü ile Yabani Yulaf Tohumlarının Mercimek Tohumlarından Ayrılmasını Etkileyen Özellikler Üzerine Bir Araştırma

The present study measured physical properties of lentil and wild oat weed; mass of 1000 seeds, true density, porosity and coefficient of static friction. A gravity table separator was used to separate wild oat weeds from lentil seeds. The gravity table separator had five adjustable parameters; longitudinal slope, latitudinal slope, amplitude of oscillation, frequency of oscillation and air velocity. The effect of these parameters was investigated in order to maximize the separation of wild oat weed from lentil. Results of tests indicated that an increase in latitudinal slope of the table from 0.5° to 1° and longitudinal slope from 1.5° to 2° resulted in increased separation of wild oat weed from lentil. At longitudinal slope of 2°, latitudinal slope of 1°, amplitude of oscillation of 5 mm, frequency of oscillation of 400 cycles min-1, and air velocity of 5.7 m s-1, the separation percentage was 37%. Finally, after determination of the most suitable settings for amplitude of oscillation and air velocity; using the information on longitudinal slope, latitudinal slope and frequency of oscillation of the table was used to calculate mathematical relations of separation percentage of wild oat weed from lentil clumps using Datafit Software.

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