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The Scientific World Journal
Volume 2012, Article ID 136218, 5 pages
Research Article

Determination of Effective Factors on Power Requirement and Conveying Capacity of a Screw Conveyor under Three Paddy Grain Varieties

1Department of Agricultural Machinery, College of Agriculture, University of Mohaghegh Ardabili, Ardabil, Iran
2Agricultural Engineering Research Institute, Shahid Fahmideh Boulevard, P.O. Box 31585-845, Karaj, Iran

Received 31 October 2011; Accepted 24 November 2011

Academic Editors: I. Watanabe and A. Welle

Copyright © 2012 Ezzatollah Askari Asli-Ardeh and Ahmad Mohsenimanesh. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


An experiment was conducted to investigate the effect of screw speed, inclination angle and variety on the required power, and conveying capacity of a screw conveyor. The experiment was designed with four levels of screw speed (600, 800, 1000, and 1200 rpm), five levels of inclination angle (0, 20, 40, 60, and 80), and three levels of variety (Alikazemi, Hashemi, and Khazar). The Length, diameter, and pitch of screw were 2, 0.78, and 0.5 m, respectively. The experimental design was a randomized complete block (RCB) with factorial layout. Maximum and minimum power requirements of tested screw conveyor were 99.29 and 81.16 Watt corresponding to conveying capacity of 3.210 and 1.975 ton/hour obtained for khazar and Alikazemi varieties, respectively. The results indicated that as screw inclination angle increased from 0 to 80, the conveying capacity decreased significantly from 3.581 to 0.932 t/h. It can be concluded that the most conveying capacity was 4.955 t/h at tests with khazar variety and conveyor inclination angle zero degree.