Experimental Determination of the Rotor Speed of a Vertical Shaft Centrifugal Nut Cracking Machine (original) (raw)
The impinging velocitythat gives that maximum cracking efficiency of a vertical shaft centrifugal palm nut cracking machine was determined in this study. A nut cracking energy instrument which consists of a hammering mass falling vertically on palm nuts placed on a base was used to determine potential energy required to crack the nuts. This energy was equated to the kinetic energy required to crack the nuts in a centrifugal palm nut cracking machine, from which the average impinging velocity was determined. Experiment was carried out to generate cracking energy data for both Dura and Tenera varieties of palm nuts available in the study area. For Dura type, highest percentage of fully cracked (FC) nuts and average impinging velocity of 32.50 m/s were obtained when the height of the hammering mass was set at 0.15m, 0.25m and 0.30m for nuts sorted into diameter ranges of d < 15mm, 15mm ≤ d ≤ 18mm, and 18mm ≤ d ≤ 22mm respectively. For the Tenera type, highest percentage of fully cra...
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