1734-OE2V

1734-OE2V

1734-OE2V

1734-OE2V

 传统的门式起重机调速方法如:绕线转子异步电动机转子串电阻调速、晶闸管定子调压调速和串级调速等，它们共同的缺点是绕线转子异步电动机有集电环和电刷，要求定期维护，由集电环和电刷引起的故障较为常见，再加上大量继电器、接触器的使用，致使现场维护量较大，调速系统的故障率较高，而且调速系统的综合技术指标较差，已不能满足工业生产的特殊要求。
交流变频调速传动具有以下特点；

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A.可以使普通异步电动机实现无级调速。
B.启动电流小,减少电源设备容量。
C.启动平滑,消除机械的冲击力,保护机械设备。
D.对电机具有保护功能,降低电机的维修费用。
E.具有显著的节电效果。
由于交流变频调速传动技术具有上述特点，已开始取代直流调速装置，成为现代电气传动的发展方向。 其调速原理如下: 从电源端输入三相交流电至变频器后，经整流滤波变换为直流电，再通过电子开关电路转换为频率及电压均可调的三相交流电，然后经滤波后输出，作为电动机的输入电源。
我国起重机开始采用变频器进行调速控制大约在80年代后期，那时大多是V/F比控制的变频器，变频无级调速的平稳性、可控性和节能等特点为交流异步电动机驱动的门式起重机大范围、高质量地调速提供了全新的方案。它具有高性能的调速指标，可以使用结构简单、工作可靠、维护方便的鼠笼异步电动机，并且高效、节能，其外围控制线路简单，维护工作量小，保护监测功能完善，运行可靠性较传统的交流调速系统有较大的提高.随着变频技术的不断发展，专业起重机生产企业也把眼光投向这一高技术领域，并针对起重机作业的特点，深入开展变频调速系统的研究。所以，采用交流变频调速是门式起重机交流调速技术发展的主流。
其次,PLC的基本、应用指令和触摸屏的人性化界面设计，使每个操作司机都能够迅速的适应并掌握本台车的操作习惯，多达86个操作画面，及故障信息查询画面，使维修人员能够迅速的查出故障原因并排除。

二     20T门吊的电气结构
本文针对汇川变频器和三菱PLC在郑州铁路局下属某货场20T门式起重机中应用作以介绍:
本起重机额定起重量: 20T, 起升高度: 11米, 起升速度: 10米/秒, 大车速度: 47.9米/秒, 小车速度: 45.2米/秒,  跨度:18米, 有效悬臂6.5米. 

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