DESIGN OF ADJUSTABLE TROLLEY OF WATER REFILL STATIONS

Alifa, Salsabila Putri (2021) DESIGN OF ADJUSTABLE TROLLEY OF WATER REFILL STATIONS. Diploma thesis, Universitas Andalas.

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Abstract

With the increase in population and the increasing need for healthy drinking water, depots for refilling drinking water gallons are increasing in number. The positive impact is the development of technology that can help supply bottled drinking water, such as practical gallons. However, this also negatively affects workers when lifting gallons. Some workers at gallon refill depot serve for lifting drinking water gallons, either from work stations to customers or gallon delivery vehicles. This activity is carried out for an average of 12 hours a day, with the number of gallons being lifted from 80 to 150 gallons per day. In this condition, workers can feel discomfort and risk of musculoskeletal complaints. Initial data were obtained from ten workers at the gallon refill depot in Padang. Sixteen body segments of the workers were classified as pain and extreme pain from 28 body segments of the workers. The calculation of the initial data from the Nordic Body Map questionnaire was obtained from ten workers, having a value of 71-89. A preliminary study was also conducted using the Workplace Ergonomic Risk Assessment (WERA) method. From the WERA data calculation, one physical risk factor for the low category is vibration. Then two physical risk factors with moderate categories, shoulder and leg posture. The high category's physical risk factors are six factors, hand posture, back posture, neck posture, forcefulness, contact stress, and work duration. WERA analysis results obtained a final score of 44, meaning that this activity needs further investigation and required change. To solve this problem, it is necessary to develop an ergonomic tool that helps depots refill drinking water gallons. The design of the drinking water gallon lifting tool will be based on the Ergonomic Function Deployment method. Three alternative types of tool designs with features, dimensions, and materials are obtained from concept development for the Morphological Chart. A design assessment was then carried out by four experts using the 8 Dimensions Garvin Quality assessment with a Likert scale. Each alternative scores 162, 153, and 153, respectively. The technology for prototyping by simple machining takes two days at a total cost of Rp. 985,000. The prototype evaluation is carried out on workers and also tool parts. The calculation of the final data from the Nordic Body Map questionnaire was obtained from five workers, having a value of 41-60, meaning that no corrective action is needed yet and action may be needed later on. Five workers conducted the trial using the tool with a scoring system using NBM and also WERA. Three out of five workers feel that the use of gallon lifting tool is helpful at work. The assessment using WERA resulted in a score of 27, which means that improvements have been acceptable. So that all parts of the tool are working correctly.

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