11-12-2012, 05:59 PM
Optimization in Design & Working of Friction Roller in the Rice Mill, using the parameters Speed of Roller, Moisture Content
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Abstract
The aim of this study is to Optimize the working life of friction rollers used in Rice Mill. Investigation on friction rollers used in Rice Mill is a need. The present work is carrying out to increase the life of the rollers. The life of the roller is in between 2 to 7 days due to high friction generated between the rollers and the moisture present in the paddy rice. Due to the moisture in the paddy rice deformation of rubber takes place and hence the husking process must be continuous until the rubber will be vanished. So rubber roller has to be changed and during the roller changing process the machinery gets rest which is necessary for the machine.
INTRODUCTION
The objective of a rice milling system is to remove the husk and the bran layers from paddy rice to produce whole white rice kernels that are sufficiently milled, free of impurities and contain a minimum number of broken kernels.
During the milling process (hulling and whitening) the paddy grain is under mechanical and heat stresses. Rice breakage at this stage is one of the main economic losses to the farmers. In the hulling operation compression and friction is used to produce brown or white rice with minimum grain breakage for de husking. Due this huge friction the rollers are oftenly broken into the pieces which is the major loss. Due this production will be stopped, labor cost will be increased
With regards to the nature of paddy hulling operation in the milling process some of the rice quality losses occur at this stage because the hulling operation is mechanical and consist of different stresses. The variety of Chinnore was used for the study. The levels of moisture content used in the tests were 9-10, 11-12 and 13-14% wet.
MATERIALS AND METHODS
This study was conducted in 2010-11 at the Institute of Engineering and Technology, Devi Ahilya Vishwavidyalaya, Indore. In this study the effects of two factors on Husk Index in rubber roll hulling machines were studied; the difference of linear speed between rollers and moisture content. The tests were carried out on variety of Chinnore, which is available at the practical site.
A laboratory rubber roll huller was used for the tests because a production size huller would require too large a quantity of rice and thus would be very expensive. In addition it would be easier to make adjustments to lab huller with the smaller rollers. The difference in linear speed of small roller was easily changed and also little amount of paddy grain is needed for the tests and the work quality of the machine has been evaluated before (Tavakoli et al., 2002).