Junichi Yonemura

Studies on the work in using welsh onion peeling machine. (IV)Noise control of welsh onion peeling machine.

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 machines 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, covers 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).