- 會議論文
汽油引擎割草機操作者手-手臂振動之評估
Assessment of Hand-Arm Vibration Exposure among the Petrol-engine Driven Grass Trimmers Operators
摘要
本研究是針對割草機所發生的振動及不同材質的防振手套作為研究調查的重點，實驗採用實際割草操作，背負式割草機與側背式割草機分別裝上牛筋繩與刀片不同之旋轉刀具，與手推式割草機共有五種機型，配合徒手及4 種手套工具，共有25 種組合，每次測量時間為不間斷1 個小時，測量位置為手背（X、Y、Z 三軸方向）與前臂（手背之最大軸方向）。結果顯示各機種手部單軸最大加權加速度振動值很小，而前臂最大軸加權頻率加速度在1.359~7.05 m/s2 之間。以我國勞工安全衛生設施規則第302 條勞工每日振動暴露時間不超過時間來進行討論，在25 種組合中有4 種，加速度值在 6 m/s2 之上，每日容許暴露時間為一小時以上，未滿二小時，4 種加速度值在 4 m/s2 之上，每日容許暴露時間為二小時以上，未滿四小時。手部防護具方面，以防振手套的三軸加權加速度減少振動值35%，前臂最大軸加權加速減少21%。以未加權的頻譜分析，背負式割草機（牛筋繩）Y 軸向主要發生振動頻率在50~100Hz、背負式割草機（刀片）Y 軸向主要發生振動頻率在80~250Hz。側背式割草機（牛筋繩）Y 軸向主要發生振動頻率在63~160Hz、側背式割草機（刀片）Y 軸向主要發生振動頻率在80~160Hz。推式割草機Y 軸向主要發生振動頻率在31.5~63Hz。
並列摘要
This study is mainly aimed at survey the vibration ofthe mowing machine, and the effect of using differentanti-vibration gloves. We applied five types mowingmachine in experiment, including rotary lawn mower,back-pack type grass trimmer of nylon cutting thread andcutter, and cutter grass trimmer machine of nylon cuttingthread and cutter, there are total 25 type mowing machinecombine with four types of gloves and operating unarmed.Each measurement time about 1 hour, and the transducerpaste on the back of hand (measured the X, Y, Z axisdirection ) and the forearm (the maximum axis of back ofthe hand). The results showed that single axial maximumof vibration acceleration of back of the hand was small.And root-mean-square frequency-weighted acceleration offorearm was 1.359~7.05 m/s2. The analyses wereconducted using the ‘ROC Labor Safety and HealthFacility Rule, article 302’ for daily vibration exposure time.The measured vibration of root-mean-squarefrequency-weighted acceleration if greater then 6 m/s2then the allowable daily vibration exposure time is 1-2hours have four types within 25 combinations; if theroot-mean-square frequency-weighted acceleration greaterthen 4 m/s2 then the allowable daily vibration exposuretime is 2-4 hours have four types within the 25combinations. At the hand protection aspect, vibrationreduction for three-axis weighted acceleration ofanti-vibration gloves was about 35% for the forearm, theweighted acceleration of maximum of axial reduceabout21%. Analyze with the not frequency weighting，Yaxis main frequency generated vibration in 50~100Hz ofthe back-pack type grass trimmer of nylon cutting thread,back-pack type grass trimmer of cutter was region in80~250Hz. Grass trimmer machine of nylon cuttingthread and cutter were region in 63~250Hz and 80~250Hzrespectively. Rotary lawn mower Y axis main frequencygenerated vibration was region in 31.5~63Hz.