Improvisation of mini Crusher by Engineering design and fabrication Principles: Imperative for Demonstration of Mechanical method of Powder Manufacturing Processes in Higher Vocational Schools

Ukeamezhim Chimezie Festus, Kpabeb Charity M.

Abstract


The provision of equipment for the purpose of teaching and learning of technological courses in higher vocational schools is limited because of the high cost of importation. Hence, the purpose of this study is “repositioning indigenous technology via design and fabrication of mini crusher for teaching powder manufacturing principles in higher vocational schoolsâ€. To achieve this, the study carried out design analyses that determined the following parameters: torque on the Shaft = 39 Nm; power required to crush material = 3.5 hp; driving and driven pulley = 600 rpm; length of belt = 1.32 m; speed of driving and driven pulley = 7.86 m/s; weight of pulley = 492 N; weight of crusher on the shaft = 1.45 kg; shaft diameter ≈ 22 mm; and tension on  V – belt = T2 = 1.213 N, T1 = 13.21 N. The selected materials are sheet and square pipes of mild steel. Other selected accessories are; V- belt, shafts, two ball bearings, bevel gear, an electrical motor of 0.5 hp, switch, plug, four meter 1.5 electrical cable, and pulley of 0.05m and 0.41m diameter. The components are joined together by both permanent welds; and temporal (bolt and nut) methods. The fabricated equipment operates electrically. The equipment was tested by feeding some bulk quantity of hardened clay materials into the machine and allowed to operate for ten minutes. The resultant product was fine powder particles.  The following recommendations were proffered: government at all level should encourage mass production of this equipment locally to save importation cost; and also to make it available for school workshop; technologists and instructors of higher vocational schools, should embrace this equipment as a means of improvisation for teaching and learning process of manufacturing technology; and the fabricated equipment should be used for entrepreneurial purposes

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