REVIEW PAPER ON DESIGN AND FABRICATION OF HYDRAULIC GROUNDNUT OIL EXPELLER

A manually operated multi-application oilseed expressing machine was designed and constructed usinglocally available materials. The machine consists of a frame, press plate, press cage, perforated cylinderand hydraulic jack. Each of these components was analyzed and results obtained were used as parameterfor sizing and fabrication of the components. Performance tests were conducted on the oilseed expressingmachine using groundnut seeds that were subjected to pre-pressing treatments of roastingtemperature and duration in the ranges of 30 –120oC and 10 –30 min and ground in to pastesrespectively. The results of performance test analysis showed that pre-pressing treatments significantlyinfluenced the performance indices of the machine at 1% level. Extraction rate decreased with increase inroasting temperature from30 to 120oC and duration from 10 to 30 min, while machine extractionefficiency depended on the product being processed. The maximum extraction rate obtained was 0.00125and 0.00133 kg/s for groundnut seeds roasted at 60oC for 10min and 30oC for 10 minrespectively. The maximum extraction efficiency of 45 and 46.6% was obtained at pre-pressin