DEVELOPMENT OF GRINDING MACHINE SUTABLE FOR MANGO KERNEL

Document Type : Original Article

Authors

1 Prof, Ag. Eng. Dept., Fac. of Ag., Cairo Univ., Egypt.

2 Assoc. Prof., Ag. Eng. Dept., Fac. of Ag., Cairo Univ., Egypt.

3 Chief Res, Tech. Trans. Res. Dept., Ag. Eng. Res. Inst., Ag. Res. Center, Dokki, Giza, Egypt.

4 Agric. Eng., Tech. Trans. Dept., Ag. Eng. Res. Inst., Ag. Res. Center, Dokki, Giza, Egypt.

Abstract

The grinding process of agricultural wastes is important process to produce pre-materials for many uses. The aim of this study was develop and evaluate the grinding machine performance suitable for mango kernels as hard wastes. The average of mango kernel per pulp ratio   was about 74.5%. The main dimensions were 53.88±7.43, 20.42±3.21 and 10.98±1.89 mm at length, width and thickness, respectively, The spherisity was (75.5±20.39 %), geometric (4.1±1.25mm) and arithmetic (28.43±3.01mm) diameters, surface area (56.9±34.3mm2), coefficient of frictions on galvanized, iron black painted and iron sheet were about 0.649, 0.577 and 0.675 respectively, hardness (444.64±118.24N) and shear strength (224.62±98.65N). The studied factories include feeding quantity "F" of 10, 15 and 20kg, drum speeds "S" at 1500, 2000, 2500 and 3000 rpm (28.26, 37.68, 47.10 and 56.52 m/s) and knives number "N" of 24, 36 and 48 knives. The grinding machine performance was estimated by determine the product quality (grinding residual distribution and mean weight diameters "MWD") and the machine performance (machine productivity, power consumed and energy requirement). From the obtained results it can be concluded that the grinding machine can be manufactured and used to grinding the local mango kernel at the feeding quantity of 20 kg, drum speed of 2000 rpm and knives number of 36 to obtain the homogeneous size distribution with less "CV" of 4.3, 11.22 and 12.26% respectively and at these studied parameters the MWD machine productivity, power consumed and specific energy requirement are 1.309mm, 2.94Mg/h, 3.60kW and 1.22kW.h/Mg respectively. The developed grinding machine which manufacture from a locally materials can be tested to grind many solid wastes to increase the developed grinding machine reliability.

Main Subjects

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