3107 テルハのリンクチェーン破断事故解析(OS.10 故障診断・予知・メンテナンス・安全性)

概要

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This paper presents the failure analysis of a hoist link chain used in a factory recycling cathode-ray tubes. The failure link chain had been used for only 8 months within the rated load until the accident occurred. According to fracture surface analyses of the failure link using the scanning electron microscopic (SEM), it was clear that the link chain had been subjected to over loads repeatedly. In order to reveal the cause of the over load affecting the link, the situation of the hoist installed in the factory was investigated in detail. As a result, it was found that the coil spring above the hook had been removed to increase the lifting range. If the spring is removed from the hook, the over winding prevent system does not work normally because the spring is a essential part of this system, and consequently, the link chain may have been subjected to the over load whenever this system worked.
2000-12-12