Development of a Hammer Mill with Double Sieving Screens

A J Fawohunre,Oluyemisi Adebanjo Ojomo

doi:10.24018/ejers.2020.5.5.1763

Abstract

A hammer mill with double sieving device was designed and fabricated from locally available materials for grinding grains and other agricultural products. The conceptual design was based on the principle of design by analysis. The test carried out on the machine showed that the crushing capacity of the machine is 51.5 Kh/hr. The moisture content, machine speed and the interaction between them had significant effect on the milling power and specific energy requirement at 5 % level of significance. Milling power and specific energy requirement of the machine increased with increase in moisture content. The maximum crushing efficiency of 79.3 %, minimum milling power and specific energy requirement of 0.09 Kw and 3.04 Kwh/mg respectively were obtained at moisture content of 8 % (wb) and machine speed of 2000 rpm. Regression models that could be used to express the relationship existing between the hammer mill performance indices, product moisture content and machine speed were established. The machine has dual purpose for either electric motor or petrol engine.

Highlights

The grains and tubers in their unprocessed state are bulky, difficult to transport and fetch very low prices in the market [1], this is a major causes of poverty among rural farmers in the developing countries [2] and encourage rural-urban migration [3]. [4], says that the processing of agricultural products like grains, tubers and dry solid agricultural products into more valuable products must be encourage and fostered to guarantee access to food [5], and reduce ruralurban migration and encourage sustainable development [6]
Hammer mill is a machine whose purpose is to shred or crush aggregate material into smaller pieces by the repeated blows of little hammers. It is designed for processing, grinding, and sieving all kinds of cereal grains such as maize, wheat, millet, corn, and sorghum, it can process different kinds of dry tubers [10]
The hammer mill test results obtained are presented in Table I; Fig. 2 to 5

Summary

Introduction

The grains and tubers in their unprocessed state are bulky, difficult to transport and fetch very low prices in the market [1], this is a major causes of poverty among rural farmers in the developing countries [2] and encourage rural-urban migration [3]. [4], says that the processing of agricultural products like grains, tubers and dry solid agricultural products into more valuable products must be encourage and fostered to guarantee access to food [5], and reduce ruralurban migration and encourage sustainable development [6]. The cereals food consumed is mostly processed through grinding by either iteration or hammering means [8]. Hammer mill is a machine whose purpose is to shred or crush aggregate material into smaller pieces by the repeated blows of little hammers. It is designed for processing, grinding, and sieving all kinds of cereal grains such as maize, wheat, millet, corn, and sorghum, it can process different kinds of dry tubers [10]. Hammer mill operates on the principle of impact and pulverization. It consists of a rotor assembly on which swinging hammers are mounted. The fineness of the particles is regulated by the use of screen of different mesh sizes [12] – [13]

Methods

Results

Conclusion