Research of electric pole saw based on ergonomics

Zhang Ying; Kang Feng; Wang Yaxiong; Li Wenbin; Tong Siyuan; Lü Mingqing

doi:10.12171/j.1000-1522.20210059

Journal of Beijing Forestry University > 2021 > 43(5): 147-154. > DOI: 10.12171/j.1000-1522.20210059

Zhang Ying, Kang Feng, Wang Yaxiong, Li Wenbin, Tong Siyuan, Lü Mingqing. Research of electric pole saw based on ergonomics[J]. Journal of Beijing Forestry University, 2021, 43(5): 147-154. DOI: 10.12171/j.1000-1522.20210059

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Research of electric pole saw based on ergonomics

Zhang Ying^{1, 2,},
Kang Feng^{1, 2},
Wang Yaxiong^{1, 2},
Li Wenbin^{1, 2, ,},
Tong Siyuan^{1, 2},
Lü Mingqing¹

1.
School of Technology, Beijing Forestry University, Beijing 100083, China
2.
Key Laboratory of State Forestry Administration on Forestry Equipment and Automation, Beijing 100083, China

More Information

Received Date: February 18, 2021
Revised Date: March 02, 2021
Available Online: April 08, 2021
Published Date: May 26, 2021

Graphical Abstract

Abstract

Abstract

Objective In the process of tree pruning, pole chain saw as an efficient and convenient tool effectively reduces the risk of climbing trees for forest workers. In this work, the ergonomic evaluation of typical electric pole saws in the market was carried out, and an improvement scheme with movable handle was proposed for its defects. The effectiveness of the modified scheme was proved by comparative experiments, which provided an improvement idea for the same type of tools.
Method The movable handle can be used to adjust the fatigue load of the tool on the arm and the whole body by changing the distance between the holding point and the center of gravity. Seventeen males were selected to perform the experiment, during which their heart ratio, surface electromyography signals of biceps brachii and palmar longus, grip distance and subjective assessment were measured during the operation of the original electric pole saw, and to select improvements based on these data.The improvement effect was evaluated by comparing the improved experimental data with that of the control group.
Result Before the improvement,the increase ratio of heart rate of the subjects was greater than 18%, indicating that the whole body fatigue load was too large. Besides, the normalized surface electromyographic signals of biceps brachii and palmar longus were higher than 20% and 30%, respectively, which revealed excessive local fatigue. By paired sample t test method, the increasing ratio of heart rate, the normalized surface electromyographic signals of biceps brachii and palmar longus, subjective assessment, and grip distance were significantly different before and after the improvement (P < 0.05).
Conclusion The overall evaluation results show that the modified electric pole chain which allows the operator to adjust the grip distance between the hands freely by the movable handle can effectively reduce the fatigue load of the arm and the whole body, and finally improve the operation comfort. Moreover, the additional cost of the modification is controlled below 100 CNY, which increases the feasibility of universal promotion.
- electric pole saw,
- ergonomics,
- surface electromyography,
- heart rate,
- subjective assessment

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References (25)

References

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Research of electric pole saw based on ergonomics