基于plc在龙门吊故障检测中的应用

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1、基于PLC在龙门吊故障检测中的应用摘要分析PLC对机电设备故障的诊断原理和它在故障诊断系统中的作用，利用PLC和计算机构成的诊断系统实现了故障诊断的智能化。充分利用机电设备系统中PLC的硬件资源，可简化诊断系统的硬件设计。轮胎式集装箱龙门起重机是集装箱专业化码头堆场的主力设备，它具有可灵活转场作业、工程投资少等特点，受到广大码头的欢迎。PLC尤其在龙门吊吊具故障诊断上得到了广泛的应用。关键字：PLC故障诊断龙门吊1AbstrasctTheprincipleofPLCdiagnosisinthefaultsofmechtronicalequipmentandthefunctioninfaultd

2、iagnosissystemareanalyzed.IntelligencediagnosisisperformedbythediagnosissystemmadeupofPLCandcomputer.ByfullutilizingthePLChardwarediagnosissystemcanbesimplified.Rubber-tyredcontainergantrycraneisthemainspecialiedcontainerterminalyardequipment,ithasaspecicalflexibleoperationandlessinvestmentect,itwas

3、welcomebythemassesofterminal.PLCespeciallyonthegantrycraneslingfaultdiagnosishasbeenwidelyused.Keywords：PLCfaultdiagnosisgantrycrane目录0引言························································51PLC诊断机电设备故障的基本原理····························51.1基于开关量信号的诊断········································51.2基于模

4、拟量信号的故障诊断····································51.3基于中断方式的故障诊断······································62PLC在故障诊断系统的作用···································63利用PLC和计算机实现智能化的诊断的方式··················74吊具信号的采集·············································75PLC硬件组态·················································

5、86无线通讯的实现··············································97吊具的PLC程序故障诊断···································10结论···························································12致谢··························································13参考文献······················································14引言集装箱运输是一

6、种经济实用的运输方式，同时他也是衡量国民经济的一个重要指标。为了提高集装箱的吞吐量，不得不提高集装箱的作业效率。轮胎式集装箱门式起重机是集装箱进行作业的主要机械。这就要求我们提高龙门吊的效率减低龙门吊出现故障频率，因此我们必须对龙门吊的故障进行准确的定位。本文主要介绍PLC在龙门吊故障检测中的应用。1PLC诊断机电设备故障的基本原理机电设备的故障信号有开关量和模拟量之分，PLC采用不同的方法对这两种信号对应的故障进行诊断。1.1基于开关量信号的诊断PLC对开关量信号的识别是通过其开光量输进模块完成的。PLC控制机电设备时，设备中的压力、温度、液位、行程快关及操作按钮等开关量传感器与PLC的输进

7、端子相连，每个输进端子在PLC的数据区中分配有一个“位”，每个“位”在内存中为一个地址。输进“位”的工作原理，如图1所示。图中，IN代表开关量输进，COM为信号公共端。IN为ON时，光敏二极管饱和导通，否则截止。故PLC的内部电路可以“感知”开关信号的有无。读取PLC输进位的状态是可作为识别开关量故障信号的根据。诊断开关量故障的过程，实质就是将PLC正常的输进位状态值与相应的输进位的实际状态值相比