Academic journal article American Academic & Scholarly Research Journal

Design and Characterization of Automatic Hand Washing and Drying Machine

Academic journal article American Academic & Scholarly Research Journal

Design and Characterization of Automatic Hand Washing and Drying Machine

Article excerpt

Abstract. The unhealthy pattern of washing and drying of hands in various restaurants and places of food selling has prompted the need for this project. We have taken the standard mechanical Hand washing and drying machine and made it a technological engineering wonder of touch-less Hand washing And Drying. The machine comprises a housing having a top portion and a bottom portion. The top portion is quasi-rectangular shaped structure comprising a fluid injection system for injecting water and liquid soap to users' hands. The bottom portion comprises a box shaped structure wherein by the side is the heating chamber for drying the hands. The machine further comprises a wash basin coupled in the interior of said box shaped structure with circular opening under where the used water or liquid soap pass through, an electronic eye for detecting the insertion of hands in said wash basin and a control unit for timing the activation of said water injection. Also in the heating chamber comprising an air injection system for injecting air through said heating chamber, a thermostat to control the temperature and a sensor that activate the drying process whenever the hands cast dark shadow across it. This research work has successfully presented a functional and highly efficient low cost sensor controlled hand washing and drying machine which is usable in different places within our geographical environment.

Keywords: Touchless hand washing, hand drying, Fluid injection system, Electronic eye, Air injection system, control unit.

(ProQuest: ... denotes formulae omitted.)


Importance of hand washing cannot be over-emphasized, especially in developing nations where eating with hands is a common practice. In some developing cultures, there is always the reluctance of hand washing before meals; and in some, hand washing has become a culturally accepted norm. Eating with the hands was going on for generations before anyone thought of washing their hands first. So along the way, through technology and hygiene practices, people become educated in the improvement of hand washing.

Hand washing is the single most important way of preventing the spread of infections, according to the US Centre for Disease Control and Prevention. Unwashed or poorly washed hands are very common way of spreading many diseases such as: cold, flu, ear infections, strep throat, diarrhea and other intestinal problems. Germs and viruses causing these diseases are passed on by such routine things as handling food, touching door knobs, shaking hands and putting mouths on a telephone receiver. And in our daily activities we practice one of these either in the offices, at home, in the market places, in the classroom and so on. Good hand washing practices have also been known to reduce the incidence of other diseases, notably pneumonia, trachoma, scabies, skin and eye infections and diarrhea-related diseases like cholera and dysentery, according to World Health Organization (WHO). The promotion of hand washing with soap is also a key strategy for controlling the spread of Avian Influenza (bird flu). After the incidence of SARS-Severe Acute Respiratory Syndrome in 2003, more and more people on their daily lives gave more attention to health habits; the daily number of hand-washing increased than before. This prompted us to contribute with this project as a way to increasing the practice of hand washing in our society so as to remain healthy.

This machine is specially designed for use in the offices, public restroom and as well for the general domestic washing and drying of the hands at home. It supplies both soapy and clean water in a sequential order during the washing and rinsing cycle and then supplies a warm air current to dry up the completely washed hand thereof. It is handy and easy to use. More importantly, it can avoid the contagious diseases; for example, when it was a manual type hand washing machine, to turn on/offthe tap, you must need the help of your hands. …

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