پديد آورندگان :
باقري، هادي دانشگاه محقق اردبيلي - گروه مهندسي مكانيك ماشينهاي كشاورزي , راسخ، منصور دانشگاه محقق اردبيلي - گروه مهندسي مكانيك ماشينهاي كشاورزي , كيانمهر، محمد حسين دانشگاه تهران پاكدشت
چكيده فارسي :
در پژوهش حاضر برخي از خواص فيزيكي عدس و علف‌هرز شير‌سگ شامل وزن هزار دانه، چگالي حقيقي، چگالي توده، تخلخل و ضريب اصطكاك استاتيكي اندازه‌گيري شد. همچنين از يك جداكننده ثقلي براي جداكردن علف‌هرز شير‌سگ همراه دانه‌هاي عدس استفاده شد. دستگاه مورد استفاده در اين تحقيق داراي پنج پارامتر قابل‌تنظيم (شيب‌هاي طولي و عرضي ميز، دامنه و فركانس نوسان ميز و سرعت هوا) مي‌باشد كه تأثير اين پارامترها براي حصول به حداكثر جداسازي علف‌هرز شير‌سگ همراه دانه‌هاي عدس مورد بررسي قرار گرفت. نتايج آزمايش‌ها نشان داد كه افزايش شيب عرضي ميز از 0/5 به يك درجه و افزايش شيب طولي ميز از 1/25 تا 2 درجه سبب افزايش جداسازي علف‌هرز شير‌سگ همراه توده عدس شد. همچنين اثر عدد بدون بعد كه نسبت نيروي اينرسي جريان هواي دميده‌شده به عدس‌ها به نيروي ناشي از نوسان را نشان مي‌دهد، در نسبت جداسازي مورد بررسي قرار گرفت. نتايج آزمايش‌ها نشان داد كه در مقدار 171 ، شيب عرضي ميز يك درجه و شيب طولي ميز 2 درجه، درصد جداسازي ناخالصي علف‌هرز شير‌سگ همراه توده عدس به 14/2 درصد مي‌رسد. پس از تعيين مناسب‌ترين دامنه نوسان ميز و سرعت هوا با استفاده از اطلاعات شيب طولي ميز، شيب عرضي ميز و ثابت اقدام به استخراج روابط تعيين درصد جداشوندگي علف‌هرز شير‌سگ از توده عدس توسط نرم‌افزار ديتافيت گرديد.
چكيده لاتين :
Introduction
Lentil (Lens culinaris Medik) is an important and highly nutritious crop belonging to the family of legumes. Lentil is cultivated worldwide but competition with weeds is a problem affecting production and can reduce performance by more than 80%. Euphorbia helioscopia weed is a major weed in lentil cultivation. In the first place, it is necessary to have a thorough and comprehensive knowledge about the characteristics of the lentils and the accompanying impurities to mechanize the process of automatizing activities related to lentils such as warehousing, sorting (grading), packaging, transportation and other activities. On the other hand, physical and aerodynamic properties of agricultural products were always regarded as significant because those are the basis for designing and construction of agricultural and machineries, transport equipment, grading and processing of agricultural products. Designing agricultural machineries was impossible without regarding these parameters, or it would lead to weak results. The study of physical properties and separation of Euphorbia helioscopia weed from lentil by a gravity separator is of extreme importance. Since no study has been done to date, in this work physical properties of lentil and Euphorbia helioscopia weed are investigated. Moroever, the effects of different parameters of a gravity separator and their influence on the separation of Euphorbia helioscopia weed from lentil seeds are evaluated.
Materials & Methods
In the present research, lentil samples were taken from farms in Ardebil province (Bileh-Savar cultivar) and transferred to the seed technology laboratory at the University of Tehran. In addition, some physical properties of lentil and weed of Euphorbia helioscopia including mass of 1000 seeds, volume, true and bulk densities and porosity and static coefficient of friction (two types of friction surface: galvanized iron sheet and particle board) were measured. In addition, in this research, a gravity separator apparatus was used for separating weed of Euphorbia helioscopia from lentils. A Laboratory Gravity Separator Type LA-K (Westrup A/S Denmark) was used to separate Euphorbia helioscopia weed from lentil seeds. Influence of parameters of machine table (longitudinal and latitudinal slopes, oscillation frequency and amplitude and velocity of air) have been studied for obtaining of maximum separation of weed of Euphorbia helioscopia from lentils. Data analysis and comparison of means were done by using MSTAT-C software and Duncan's Multiple Range Test.
Results & Discussion
The obtained results show the main effects oscillation of frequency, latitudinal slope, and longitudinal slope, the mutual binary effect of latitudinal and longitudinal slope, the mutual binary effect of the latitudinal slope and the frequency of oscillation were significant at a 1% and the mutual binary effect of the longitudinal slope and the frequency of oscillation significant at a 5%. However, the mutual triple effect of
oscillation frequency, longitudinal slope, and latitudinal slope was not significant. Furthermore, results
showed that increase of latitudinal slope of table and increase of longitudinal slope from 1.25 to 2 degrees
increased separation of weed of Euphorbia helioscopia from lentils. The results of the experiment showed
that the separation of Euphorbia helioscopia weed from lentils get to maximum 14.2 percent .After
determining most suitable amplitude and velocity of air, using data from the longitudinal slope, latitudinal
slope and dimensionless number V / a was used to calculate mathematical relations of separation
percentage of Euphorbia helioscopia weed from lentil clumps using Datafit software.
Conclusion
1. Physical properties obtained for lentil were as weight of 1000 seeds (57.03 g), true density (1.214 g cm-3),
bulk density (0.782 g cm-3), coefficient of static friction (galvanized iron sheet (0.394 degrees) and
particle board (0.37 degrees)), porosity (35.59 %), and the Euphorbia helioscopia weed including weight
of 1000 seeds (5.69 g), true density (0.857 g cm-3), bulk density (0.538 g cm-3), coefficient of static
friction (galvanized iron sheet (0.32 degrees) and particle board (0.40 degrees)), porosity (37.2 %).
2. Increased latitudinal slope of the table from 0.5° to 1° and longitudinal slope of the table from 1.25° to 2°
result in increased separation percentage of wild oat weed from lentil seeds.
3. The results demonstrated that at settings of longitudinal slope of 2°, latitudinal slope 1°, and frequency of
oscillation 400 cycles min-1, the maximum separation was 14.2%. In this case, the output lentil seeds
contained the least amount of wild oat weeds.
