可编程控制器(PLC)具有强大控制、模拟量处理和数学运算等功能，使其能够应用于起重机力矩超载保护中。
Programme logic controller (PLC) has the function of mighty control, analog signals transaction and mathematics compute, it insure that PLC can be used on the crane moment limiter.
采集不同类型，不同额定起重量起重机一段时间内相应起重量的工作次数数据，以模拟出危险点处相应的载荷谱。
Load spectrum of danger points was simulated by collecting the working frequency of different types of cranes in a period time.
介绍了冶金起重机金属结构偏轨箱形模拟主梁的疲劳失效分析研究结果，提出疲劳失效的原因及改进措施。
Failure analysis of side rail box imitating chief beam of metallurgy crane was studied. Cause of fatigue failure and improving method were given.
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