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2007年4月18日,辽宁省铁岭市清河特殊钢有限责任公司发生钢水包倾覆的特别重大事故,造成现场32名工人死亡,6人重伤。经调查,造成该事故的原因之一就是起升机构的制动器接触器自锁。为此,国家质检总局下发了《关于冶金起重机械整治工作有关意见的通知》(质检办特[2007]375号),要求起重机起升机构电气系统应具有正反向接触器故障保护功能。同时,2008年8月国家质检总局颁布的《起重机械安装改造重大维修监督检验规则》(TGS Q 7016—2008)及《起重机械定期检验
On April 18, 2007, a particularly serious accident involving the overturning of ladle occurred in Qinghe Special Steel Co., Ltd., Tieling City, Liaoning Province, resulting in 32 workers being killed and 6 seriously injured. After investigation, one of the causes of the accident is that the brake mechanism of the lifting mechanism is self-locking. To this end, the State Administration of Quality Supervision issued a “Notice on the metallurgical lifting machinery remediation work” (Quality Inspection Office Special [2007] No. 375), lifting mechanism electrical system requires a positive and negative contactor fault Protective function. At the same time, in August 2008 issued by the State Administration of Quality Supervision “lifting installation and maintenance of major maintenance supervision and inspection rules” (TGS Q 7016-2008) and "Crane periodic inspection