FRUIT FLOW CALCULATION ON THE ROTATING SIZING MACHINES

• Published in: Tehnički vjesnik Vol. 21; no. 3; pp. 645 - 650
• Main Authors: Markovic, Dragan, Mladenovic, Nikola, Simonovic, Vojislav, Markovic, Ivana, Stevanovic-Masovic, Snezana
• Format: Journal Article
• Language: English
• Published: 01-06-2014
• Subjects: Apples; Crops; Differential equations; Flow rate; Frozen; Fruits; Rotating; Sizing
• ISSN: 1330-3651; 1848-6339

This paper analyzes theoretically the motion and flow of eight fruit types, along rotating sizing machines. It starts from differential equation of fruit motion on a rotating disk of the sizing machine. A universal method that can generally be applied to determine the flow of all types of rotary sizing machine is developed. Flow analysis comprised sized fruit mass and flow. New empirical coefficients were introduced: extent ratio, feed ratio and distribution ratio. In particular, the influence of the relative speed of fruit on the capacity of sizing machines is researched. The results, obtained for the adopted values extend, feed and distribution ratio k sub(e)=0,7; k sub(f)1; k sub(d)0,5 coincide approximately with those reported to date for fruit flow rate on sizing machines. It was found that flow rates vary considerably, depending on fruit diameter and mass. Fruit numbers flow ranges from 8949 crops/h for apple to 40 157 crops/h for deep frozen raspberry. Mass flow varies from 229,1 kg/h for cherry to 2054,7 kg/h for apple.Original Abstract: U ovom radu teorijski je analizirano gibanje i protok osam vrsta voca duz rotacijskog kalibratora. Polazi se od diferencijalne jednadzbe gibanja voca na rotirajucem disku kalibratora. Razvijen je opci model koji moze biti primijenjen za odredivanje protoka za sve tipove rotacijskih kalibratora. Analiza protoka obuhvatila je masu i protok kalibriranog voca. Uvedeni su novi iskustveni omjeri: omjer postotnog iskoristenja opsega diska, omjer punjenja i omjer raspodjele plodova. Posebno je istrazen utjecaj relativne brzine voca na kapacitet kalibratora. Za usvojene vrijednosti navedenih omjera k sub(e)0,7; k sub(f)1; kd=0,5 dobiveni su rezultati koji se priblizno poklapaju s do sada poznatim protocima voca na kalibratorima. Ustanovljeno je da protoci znacajno variraju u ovisnosti o promjeru i masi voca. Kolicinski protok varira od 8949 plod/h za jabuku do 40 157 plod/h za duboko zamrznutu malinu. Maseni protok varira od 229,1 kg/h za visnju do 2054,7 kg/h za jabuku.