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Subject: Farm, Machinery and Power × Author: Goyal, Rajesh ×
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    Development and evaluation of tractor operated flail type forage harvester with chaffing system
    (PAU, 2015) Goyal, Rajesh; Mahal, Jaskarn Singh
    Fodder harvesting, transporting and its chopping is a major resource consuming component in dairy farming business. To do all the above three operation simultaneously, a tractor operated flail type forage harvester cum chopper was developed in the Dept of FM&PE, PAU. But machine could not become popular at farmer’s field because of uneven size of cut of fodder. Thus a study was undertaken to develop and evaluate a tractor operated flail type forage harvester with chaffing system. For this, flail unit of already developed machine was studied for different flail peripherial speeds ( 3 levels : 25, 29 & 35 m/s ) and forward speeds ( 3 levels : 2.5, 3.8 & 4.6 km/h ) for harvesting two types of fodder crops i.e Maize and Sorghum. Bulk density of fodder chopped by flails, height of cut, harvesting efficiency, flail throw efficiency were taken as performance parameters. Optimum combination of parameters were Flail peripherial speed of 35 m/s and forward speed of 2.5 km/hat which loss of fodder was minimum due to maximum flail throw efficiency and harvesting efficiency. The bulk density of fodder chopped by flails at these speeds was 103.5 kg/m3. A tractor operated flail type forage harvester with chaffing system was developed by replacing screw conveyer & blowing cum chopping mechanism with belt conveyer and positive feed chaffing system respectively. For this, design of belt conveyer and chaffing system was done considering the cropping intensity of fodder crop, bulk density of fodder chopped by flails and field capacity of machine at the optimum selected speed of machine. The developed machine was evaluated for three forward speeds (3 levels: 2.0, 2.5 & 3.0 km/h) and three conveyer speeds (3 levels: 0.55, 0.70 & 0.85 m/s) on two crops maize and sorghum. The forward speed of 2.0 km/h and conveyer speed of 0.55 m/swas foundto be best among all the studied parameters. The weighted size of cut of chopped fodderfor maize and sorghum fodder was 3.09 cm and 3.04 cm respectively. The fuel consumption, height of cut, harvesting efficiency, material capacity and field capacity for maize and sorghum fodderwas 6.25 l/h, 4.8 cm, 98.0 %, 6.53 t/h & 0.23 ha/h and 6.48 l/h, 4.9 cm, 98.5 %, 6.60 t/h & 0.23 ha/hrespectively.