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现行的TSG Q7015—2008《起重机械定期检验规则》、TSG Q7016—2008《起重机械安装改造重大维修监督检验规则》、TSG Q0002—2008《起重机械安全技术监察规程——桥式起重机》等安全技术规范均规定:吊运熔融金属的起重机,起升机构应当具有正反向接触器故障保护功能,防止电动机失电而制动器仍然在通电,导致电动机失速造成重物坠落。其要求是指当使用正反相接触器功能且用于吊运熔融金属的起重
The current TSG Q7015-2008 “Lifting Machinery Periodic Inspection Rules”, TSG Q7016-2008 “Lifting Machinery Installation and Maintenance of major maintenance supervision and inspection rules”, TSG Q0002-2008 “Crane Safety Technology Supervision Regulations - Bridge Crane” Other safety specifications stipulate that cranes and hoisting gear lifting molten metal should have the function of forward and reverse contactor fault protection to prevent the motor from losing power while the brake is still energized, causing the electric motor to stall and causing heavy objects to fall. Its requirements refer to lifting when using positive and negative contactor functions and for lifting molten metal