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本文由一起自动扶梯事故展开，结合梳齿板保护装置的动作原理和盖板的结构设计，利用结构图和实物图对事故原因进行详细的分析，针对事故发生的三个问题点，提出了防止盖板和前沿板搭接失效、防止盖板发生翻转和盖板下方运动部件的防护等预防措施和整改方案，供自动扶梯的设计、制造、安装、维保、使用管理和检验人员参考。“,”With a escalator accident, based on the action principle of comb plate protection device and the structural design of the cover, this paper analyzes the cause of the accident by using the structural and physical map in detail. Speciifc to the three problems point of the accident, this paper put forward the preventive measures and the reform program including prevent the cover plate and front plate lap joint failure, prevent the cover plate lfip and preventive measures of the moving parts below the cover plate, provide the references for the design, manufacture, installation, maintenance, management and inspection person of escalator.