Development and comparative study of cast iron rasp bar and nylon rasp bar threshing cylinders for paddy threshing
2013
Dhananchezhiyan, Perumal (Central Institute of Agricultural Engineering (ICAR), Coimbatore (India). Regional centre) | Parveen, Sathar (Tamil Nadu Agricultural University, Coimbatore (India). Agricultural Engineering College and Research Institute) | Pandian, Sundara Karpoora Narasingam (Tamil Nadu Agricultural University, Coimbatore (India). Agricultural Engineering College and Research Institute) | Rangasamy, Kuppan (Tamil Nadu Agricultural University, Coimbatore (India). Agricultural Engineering College and Research Institute)
Two types of threshing cylinders, namely cast iron rasp bar threshing cylinder and nylon rasp bar threshing cylinder, were developed and fitted with portable paddy thresher. Each threshing cylinder was tested for its performance in terms of threshing efficiency and grain damage at different levels of factors: concave clearance (15, 20, 25 mm), cylinder peripheral speed (11.7, 14.1, 16.5 m-s-1), grain moisture (13.5%, 16.5%, 19.5%) and feed rate (200, 400, 600 kg-h-1). Comparing the maximum threshing efficiency, minimum grain damage in different combinations was achieved at 20 mm concave clearance, 16.5 m-s-1 cylinder speed, 13.5% moisture content and at a feed rate of 600 kg-h-1. The grain damage occurred at this combination was 2.76% and 1.73% respectively, for cast iron rasp bar and nylon rasp bar threshing cylinders. The threshing efficiency occurred at this combination was 99.95% and 99.93% respectively, for cast iron rasp bar and nylon rasp bar threshing cylinders.
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