Design And Construction Of A Mechanical Vibration System For Application In Sieving Of Sand.
Nkajja, Marvin Peter
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Sand is a valuable non-renewable commodity used for building in this rapidly growing global construction market. It is one of the highest volumes of raw materials used in the construction industry after water. Due to several advancements in techniques of construction, the quality of sand has been critically considered. For example; plastering or wall finishes largely requires fine smooth sand particles, foundry work also requires fine sand particles to ensure good surface finish. This has led to processes like sieving where sand particles are separated according to particle sizes. Various sieving machines have been invented such as rotary and vibratory sieving machines which are electrically powered. However, the widespread use of these innovations is still low due to the problem of unaffordability (high purchase prices), high daily expenses on electricity (1unit of UMEME electricity is approx. Ugshs 700) and low incomes of users. The builders and construction companies therefore, still rely on the traditional sieving method which is equally inefficient because it requires 3 operators, it’s unsafe (due to dust emitted), exhausting (requires lifting and shaking of sieve with hands) and produces a low output per unit time (0.7m3 /hr.). This has often led to delays in work completion as well as increased operation costs (paying operators). In order to solve this problem, the author proposed the design and construction of a sieving machine that uses a mechanical vibration system to sieve the dry sand. Several design procedures were undertaken as illustrated in the proceeding Chapters to fabricate a working prototype of the machine. After various tests on the fabricated prototype, it was noted that the machine solved this problem as it increased the sieving rate from 0.7m3 /hr. to 1.2m3 /hr. with only one operator. The machine is energy efficient as it is only hand cranked periodically (no need to carry and shake). The machine is also affordable (approximately Ugshs. 700,000) and maintainable since it’s made from readily available materials. It is also comprised of some secondary features like portability and flexibility (can be used to sieve and sort agricultural produce like beans)