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Subject: Farm, Machinery and Power × Author: KAU × End date: 1996 × Start date: 1996 × Type: Thesis ×
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    ThesisItemOpen Access
    Development and performance evaluation of a black pepper skinner
    (Department of Farm Power Machinery and Energy, Kelappaji College of Agricultural Engineering and Technology, Tavanur, 1996) Anandabose, D; KAU; Jippu Jacob
    A power operated black pepper skinner was developed, tested and its performance evaluated. The major parts were two cylinder – concave assemblies, a hopper, a feed roll, an inclined belt separator assembly and a variable speed electric motor with a speed reduction unit of 10:1 ratio. The decortications took place as a result of the compressive and the shearing forces acting upon the pepper berries fed between the rotating drum and the stationary concave. A 3 – factor, Factorial Experiment in Completely Randomized Design (CRD) with feed rate, drum speed and surface condition as factors was adopted. The maximum overall decorticating efficiency was observed at the feed rate of 12 kg/h and drum speed of 20 rpm for both the surface types. The maximum decorticating efficiency observed for coir-mat was 91.5 and that observed for rubber surface was 94.2. The effectiveness of wholeness of kernels was found to show lower values for the highest speed of 25 rpm due to the crushing of berries. The maximum overall decorticating efficiency recorded for coir – mat was 87.7 per cent and that recorded for rubber sheet was 90.3 per cent. The study showed that the parameters of feed rate, drum speed, and surface type, have significant influenz on decorticating efficiency, effectiveness of wholeness of kernals and overall decorticating efficiency.
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    ThesisItemOpen Access
    Development and testing of a large diameter pit digger for laterite terrain
    (Department of Farm Power Machinery and Energy, Kelappaji College of Agricultural Engineering and Technology, Tavanur, 1996) Preman, P S; KAU; Jippu, Jacob
    A large diameter pit digger was developed as an attachment to tractor for making large size pits in laterite suitable for planting saplings of trees especially for coconut palms. It was tested and evaluated at the Kelappaji College of Agricultural Engg. & Tech., Tavanur. The pit digger mainly consisted of a tractor rear-mounted twin-blade laterite cutter. The twin-blade laterite cutter essentially consisted of two circular blades, a main shaft, two cast iron hubs, two bearings and bearing blocks, power transmission elements, a main frame, two protective shields and one stopper. A 3 phase, 3-hp electric motor of 1440 rpm at a speed at a speed ratio of 2.1:1 was used for rotating the blades. By using a jib crane twin-blade laterite cutter was hitched to the three point hitch system of a tractor. Pit having approximately a square-horizontal cross-section and stepped or rebated downwards in four steps was made in laterite. Size of pit obtained was 1290 x 1190 mm at the top and 830 x 623 mm at the bottom with a total depth of 900 mm. The volume of pit was 0.914 m3. The capacity of machine was 2.24 pits of 0.914 m3 in a day of 8 h. For making a pit of 0.914 m3, the total electrical energy consumption was 4.111 kWh and the diesel fuel consumed by tractor was 18.5 L. The cost of digger excluding cost of motor, jib crane and tractor was Rs. 3800. The operating cost of the digger was Rs. 140.61 per hour and the cost of making one pit was Rs. 453.23. After taking in to account of the cost recovered due to the 41 laterite blocks obtained while making the pit, the net cost of making a pit was Rs. 207.12.
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    ThesisItemOpen Access
    Modification and testing of KAU Arecanut De-husker
    (Department of Farm Power Machinery and Energy, Kelappaji College of Agricultural Engineering and Technology, Tavanur, 1996) Rajmohan, C K; KAU; Jippu, Jacob
    An arecanut dehusker consisting of mainly a pair of fluted rollers, a pressure roller assembly, a scrapper assembly, a guide chute and a feed tray was developed in this study. The arecanut was fed between the two counter- rotating fluted rollers and was pressed against these rollers by the pressure roller. The fluted rollers gripped the husk and pulled it to the rear side of the rollers. In the process the husk was ripped open and the kernel was ejected from its shell. The performance of the machine was studied at speeds of 60, 90,120,150 and 180 rpm and with three different surface characteristics of the rollers. The surface characteristics of the rollers were varied by having different number of teeth and pitch. From the studies the optimum setup of the machine for deriving maximum dehusking efficiency and minimum damage to the dehusked kernels and unhusked fruits was obtained. This was at a speed of 150 rpm against the roller surface having 30 teeth with pitch 3.9mm, width 2.0mm, and depth 1.0 mm. At this set-up the dehusking efficiency, percentage of the number of dehusked kernals and unhusked fruits damaged were 94.4, 5.5 and zero percent respectively. And also this set-up yielded an output of 23 kg of arecanut kernals per hour.