Design and construction of a soya bean milk extracting machine.

Abstract

Soya beans are one of the most important food plants of the world is an annual crop that is capable of supplying most nutrients and has a longer shelf life compared to cow milk. It can substitute, for meat and to some extent. for milk. The protein of soybean is called a complete protein, because it supplies sufficient amounts of the kinds of amino acids such as Lysine, Glycine required by the body for building and repair of tissues and supports to overcome malnutrition. and supplies minerals mainly calcium that strengthens. the bones: Soya bean milk is obtained using different technologies such as use of mortars and pestles. blenders, soymilk production machines that are require high initial cost, therefore local processors carry out extraction of soymilk by pounding and grinding soaked and pre-boiled soybeans as fine as possible with help of a home blender or mortar and pestle then later are mixed water then the liquid is filtered. with a cloth. This method produces milk that may have contaminants, ineffective and time consuming, thus with help of a soy bean milk extractor, Local processors will be able to reduce on the level of contamination and time therefore this created a need to design and construct a soya milk extracting machine to process to present the above challenges. Conceptualization of the machine involved two inter-related units; the crushing unit and the mixing unit. Different components of the -machine were designed basing on the physical, mechanical and chemical properties of the. soya beans, the components include; the feed hopper, crushing rollers, screw conveyor, main shaft and roll shafts, soya milk collection chamber. main frame, driving mechanism and analysing forces acting on the components to prevent failure. From the designs, crushing unit operates at a speed of 923.264rpm and the mixing and compressing unit at a speed of 759.43rpm with a total maximum transmitted power requirement of 3HP After. fabrication, the performance and economic analysis of the machine were performed in terms of extraction efficiency of 57.8%, crushing efficiency resulted into 71.7% total cost; Ugx. l.166M, the pay back-period of 29days and its 'Net present value is 2,386,346, since its greater than O, the project is viable; Owing to the performance and economic analysis of the machine, it achieves all its design purposes hence it is recommended for commercialization and adoption by the target groups.