DEVELOPMENT OF DUAL OPERATED SINGLESCREW- DRIVEN YAM POUNDING MACHINE

Abstract

The development of dual operated single screw driven yam pounding machine was carried out by this work. The machine was developed to carried out both manual and motorized operations and improved on the existing yam pounding machines which were observed to have being producing seedling in the pounded yam. Beaters are developed by this work to prevent formation of lumps in the pounded yam. The problem of epileptic power supply causes the pounded yam to be trapped in the machine. Therefore, manual hand winder was developed by this work to argument the motorized operation when there is power outrage. The machine is suitable for domestic use in both Rural areas and Urban cities. The stainless steel and mild steel materials were used in the design of the machine based on the availability, strength, appearance, cost and corrosion resistance. The machine consist of manual hand winder, electric motor, pulley, v-belt, barrel, screw shaft and supporting frame. The maximum volume of yam the machine can pound is 0.0000479m3/min while the 1kg of yam for this work was pounded at a time of 8.07 minutes using the motorize operation and 13.18m minute using the manual operation. The coefficient of friction between pounded yam and the stainless steel was found to be 1:1 from experience. The crushing stress of the boiled yam was 17.59 / 2, while the density of yam before and after boiling was 1.25x10-3kg/cm3 and 1.95x10-3kg/cm3 respectively. The white yam was found to produced better homogeneous bond formation or desired texture of the pounded yam from the study.