CAD Model treadles mass pulleys collection containers mass piston lower pulleys mass pulleys
Market & Customer Data Purpose – Many people (particularly in Africa) lack oil in their diet and suffer from malnutrition and disease – Only 5% of peanut oil produced worldwide is imported/exported. There is a need for locally producing peanut oil. Customer – Small-scale nut/seed oil producers worldwide, specifically in developing countries Market (for peanut oil and meal) – 49.2% of peanut processing is devoted to oil production. – West Africa, China, and India are the world leaders in utilizing peanuts for crushing (combined total of 2,580,000 metric tons/year) Africa: 5,423,000 metric tons/year Asia: 20,964,000 metric tons/year
Design Specifications Customer Needs/Technical Requirements Design Attributes Is human-poweredTreadles Can be operated by someone who is lightweight Pulley system to allow operator to lift significantly more than his/her own body weight Must generate pressures of at least 600 psi Piston with large mass Can be easily constructed and repaired Uses pulleys and rope (as opposed to gears) to transfer power from human to piston
Design Parameters Peanut Oil Extraction – Hydraulic press with gauge provided by Amy Smith – Pressures: 200 psi: onset of oil extraction 800 psi: oil drips – 25% of peanut mass is extracted as oil – Video Video
Technical Analyses Assumptions: – 100 lb. person – Lift mass of 1000 lbs. – 1:1 lever arm ratio Requirements: – 10 turns on piston pulley system – 2 in 2 of a layer of peanuts Results: – Step size of 1 ½ ft. Piston travels only 2 inches – Natural hold at step transitions to squeeze out oil
Conclusion What we learned: – Some methods feasible, but complicated: Gears Ratchet mechanism – Required pressure is difficult to obtain using human power alone. Recommendations: – Can pounding extract equal amount of oil? – Is a hydraulic mechanism too intricate?