Studies on the work in using welsh onion peeling machine. (IV)Noise control of welsh onion peeling machine.:(IV) Noise Control of Welsh Onion Peeling Machine

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It is considered to be an effective method to cover the noise resource in order to eliminate the high frequency noise from a welsh onion peeling machine.In this study, some soundproof equipments were made on an experimental basis and their performance were tested. Moreover, a method to prevent a welsh onion from damage caused by the machine's nozzle was investigated. Results are as follows;1. The noise could be reduced, down by over 10dB (A), by using a cover with an absorbing material (e.g. urethance). Specially, a high frequency range sound was more reduced. Therefore, the permitted operating time per day could be extended 5 to 8 times longer than by using one without cover.We could obtain a similar effect by using a trial muffler with an expanding room.In a soundproof equipment, cover's shape had a low effect but the absorbing material had a high effect.2. The damage of a Welsh onion caused by using a peeling machine could be almost prevented by wrapping a urethane around the nozzle of the machine. Therefore, by this method the noise could be reduced down to about 4dB (A).
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