طراحی، ساخت و ارزیابی عملکرد دستگاه فندق‌شکن مخروطی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 هیات علمی، گروه فنی کشاورزی، پردیس ابوریحان، دانشگاه تهران، تهران، ایران

2 مدرس و سرپرست کارگاه ماشین ابزار هنرستان فنی شهید چمران قزوین

چکیده

در این تحقیق به منظور شکستن پوسته سخت و خشبی فندق و خارج کردن مغز به صورت سالم و کامل از آن، دستگاه فندق­شکن مخروطی با محور عمودی طراحی، ساخت و ارزیابی گردید. در طراحی و ساخت دستگاه فندق‌شکن محاسبات و طراحی دستگاه بر اساس داده‌های خواص فیزیکی و ملاحظات خواص مکانیکی فندق انجام شد. اساس کار دستگاه برای انجام این فرآیند بر اساس دو پوستۀ مخروطی هم محور است که مخروط خارجی (ضد کوبنده) روی شاسی ثابت و مخروط داخلی (کوبنده) با محور عمودی دارای حرکت دورانی است. دانه­های فندق در فضای بین دو مخروط در ناحیه فعال شکست تحت اثر نیروهای فشاری و برشی قرار گرفته و پوسته چوبی شکسته شده و مغز به صورت سالم خارج شود. عملکرد دستگاه در قالب آزمایش فاکتوریل با طرح پایۀ کاملاً تصادفی با سه فاکتور، رطوبت فندق در دو سطح 5/8 و 0/5 درصد (بر پایه تر)، طبقۀ اندازۀ فندق در سه سطح اندازه­بندی ریز (کوچک­تر از 14 میلی­متر)، متوسط (بزرگ­تر از 14 و کوچک­تر از 16 میلی­متر) و درشت (بزرگ­تر از 16 میلی­متر) و سه سطح سرعت دورانی 150، 200 و 250 دور در دقیقه با سه تکرار انجام شد. نتایج نشان داد که اثر رطوبت و طبقه اندازه فندق بر درصد مغزهای سالم و تلفات کلی مغز در سطح 1 درصد معنی­دار بود، لکن اثر سرعت دورانی معنی­دار نشد. به طور کلی درصد فندق سالم در رطوبت­های 5 و 5/8 درصد به ترتیب 1/86 و 1/92 درصد بود. عملکرد دستگاه در تولید مغز سالم برای طبقه اندازهای ریز، متوسط و به ترتیب 2/87، 5/89 و 6/90 درصد بود.

کلیدواژه‌ها


عنوان مقاله [English]

Design, Construction, and Performance Evaluation of a Conical Hazelnuts Cracker Machine

نویسندگان [English]

  • Ali mashaallah Kermani 1
  • Hossein Mafi 2
1 Department of Agro-technology Engineering,, Aburaihan Campus, University of Tehran, Tehran, Iran
2 Teacher and supervisor of the machine tool workshop, Shahid Chamran Technical High School, Qazvin
چکیده [English]

In this research, to breaking the hard woody shell of hazelnuts to obtain the whole and health kernels the conical hazelnut cracker prototype machine with the vertical shaft was designed, constructed, and evaluated. Calculations of the design and manufacturing this machine were performed based on data on the physical and mechanical properties of hazelnuts. The working principle used for this process was based on two coaxial conical shells, which the external shell was fixed on the chassis, and the internal shell named rotor was driven by a vertical shaft. The hazelnut kernels in the space between the two cones in the active area of fracture are affected by the compressive and shear forces and the wood shell is broken and the kernel is removed healthy. Performance evaluation of machine was conducted as a factorial experiment in the form of a CRD with three factors of the moisture content (MC) of hazelnuts in two levels of 5.0% and 8.5% wet basis, the size class (SC) of hazelnut in three levels of small (size < 14 mm), medium (14 mm ≤ size < 16 mm) and large (size ≥ 16 mm), and the rotor rotational speed (RRS) at three levels of 150, 200 and 250 rpm. Results showed that MC and SC have significantly effects on the percent of the intact kernel and the overall losses at the level of 1%, but the RRS had no significant effect on them. In general, the percentage of the intact hazelnuts at 5% and 8.5% MC were 86.1% and 92.1%, respectively. The performance of the hazelnut cracker machine in producing the intact kernel for the size classes of the small, medium, and large was 87.2%, 89.5%, and 90.6%, respectively.

کلیدواژه‌ها [English]

  • Design and construction
  • Hazelnut
  • Hazelnut cracker
  • Performance evaluation
  • Postharvest processing
Anon. (1998). Moisture measurement - Peanuts. ASAE Standards, S368.3, American Society of Agriculturual Engineers, St. Joseph, Michigan 49085.
Atiku, A., Aviara, N., & Haque, M. (2004). Performance evaluation of a bambara ground nut sheller. Agricultural Engineering International: the CIGR Journal of Scientific Research and Development. Manuscript PM 04 002. Vol. VI. July.
Aydin, C. (2002). Physical properties of hazelnuts. Biosystems Engineering, 82(3), 297–303.
Brgvnyv, F., Germain, A., & Sarakvyyn, C. (1992). Hazelnuts: cultivation and production. Translated by: Mahmoud Darvishian, Iran Technical Publisher, Tehran, 176 pp. (In Farsi)
Food and Agriculture Organization (FAO). (2019). Data. Retrieved January 12, 2021, from http://www.fao.org/faostat/en/#data/QC
Hejazipour, H., Ebrahimi, R., & Ghasemi-Varnamkhasti, M. (2014). Fabrication and evaluation of a single-shell barrel-type mechanized walnut cracker. Journal of Agricultural Engineering Research, 14(4), 105–116.
Karimi, F., & Fadavi, A. (2014). Design, construction and evaluation of wild pistachio sheller. Journal of Agricultural Machinery, 4(2), 133–140. (In Farsi)
Kermani, A. M. (2012). Evaluation of some physical and mechanical properties of hazelnut. Journal of Food Science and Technology, Vol. 4, No. 2, 69–78. (In Farsi)
Kermani, A. M., & Kouravand, Sh. (2016). Design, construction and evaluation of sizing machine for hazelnuts. Iranian Journal of Biosystems Engineering, 47(2), 375–381. (In Farsi)
Khazaei, J. (1995). Design and manufacture of walnut cracker. Master of Science Thesis, Faculty of Agriculture, Tarbiat Modares University.
Kilanko, O., Ojolo, S. J., Inegbenebor, A. O., Ilori, T. A., Leramo, R. O., Babalola, P. O., & Oyedepo, S. O. (2018). Design and performance evaluation of centrifugal cashew nut sheller for improving the whole kernel recovery. Agricultural Engineering International: CIGR Journal, 20(1), 162–170.
Oluwole, F. A., Aviara, N. A., & Haque, M. A. (2004). Development and performance tests of a sheanut cracker. Journal of Food Engineering, 65, 117–123.
Ozdemir, M. (1999). Comparison of the quality of hazelnuts unshelled with modifed conical sheller and stone sheller. Journal of Agricultural Engineering Research, 72(3), 211–216.
Ozdemir, M., & Ozilgen, M. (1997). Comparison of the quality of hazelnuts shelled with different sizing and cracking systems. Journal of Agricultural Engineering Research, 67, 219–227.
Rahemi, M., & Javadi, D. (2000). Effect of pollen source on nut and kernel characteristics of hazelnut. Acta Horticulture, 556, 371–376.
Rostami, M. A. (2008). Design, development and evaluation of a peanut sheller. Journal of Agricultural Engineering Research, 9(1), 1–14. (In Farsi)
Shamsi, M., & Yarbakht, M. (2004). Investigating the performance of a pistachio kernel machine. 3rd National Conference on Agricultural Machinery and Mechanization of Iran, September 11–12, 2004, Shahid Bahonar University, Kerman.
Spencer, K. (1999). SpencCracker, an apparatus for shucking pecans. U. S. Patent, No. 5931087.
Spotts, M. F., Shoup, T. E., & Hornberger, L. E. (2004). Design of Machine Elements, Eighth Edition. Pearson Prentice Hall, Upper Saddle River, NJ, USA.
Srivastava, Ajit K., Goering, Carroll E., & Rohrbach, R. (2006). Engineering Principles of Agricultural Machines. 2nd ed., American Society of Agricultural and Biological Engineering, St. Joseph, Michigan, United Sateate.
Tahmasebi, M., Tavakoli Hashjin, T., & Khoshtaghaza, M. H. (2009). Investigation of design factors and evaluation of oak peeling machine. 4th National Symposion on Losses Agricultural Product, November 11, 2009, Tarbiat Modares University, Tehran.