NBC-250焊机电路原理分析及故障处理

河南机电高等专科学校毕业设计说明书1河南机电高等专科学校毕业论文论文题目：NBC-250焊机电路原理分析及故障处理系部材料工程系专业焊接技术及自动化班级焊接043学生姓名学号0433323指导教师李兴霞2007年5月22日河南机电高等专科学校毕业设计说明书2摘要：本课题为NBC-250焊机电路原理分析与故障处理的设计。NBC-250焊机主要由焊接电源、控制装置、送丝机、焊枪及供气系统等组成，其中焊接电源是核心部分，其设计参数的合理与否对整机的性能影响较大。NBC-250焊机的焊接电源由主电路和控制电路两大部分组成。其中主电路由带有特殊抽头的变压器、三相桥式整流器、电压调节器和电源输出电抗器组成。控制电路由控制变压器、时序控制电路和带电枢电压负反馈的送丝机控制电路组成。另外，本文通过对NBC-250焊机常见故障进行了分析，并对产生故障的原因进行了分析处理，简述了焊机故障检修的简单程序与注意事项。关键词：NBC-250焊机；三相桥式整流器；故障处理ABSTRACTThegraduationprojectistostudiestheknowledgeacomprehensiveutilization,candeepenustotheelementaryknowledgeunderstandingwillbuildthegoodfoundationforthelaterwork.ThistopicistheNBC-250weldingmachinecircuitryanalysisandthebreakdownprocessingdesign.ThroughhascarriedontheanalysistotheNBC-250weldingmachinecommonbreakdown,andthepairprocessbreakdownreasonhascarriedonanalysisprocessing,hassummarizedtheweldingmachinetroubleshootingsimpleprocedureandthemattersneedingattention.TheNBC-250weldingmachineweldingpowersourcetwomajorpartsiscomposedbythemaincircuitandthecontrolcircuit.Maincircuitbyhasthespecialtapthetransformer,thethree-phasebridgetyperectifier,thevoltageregulatorandthepowersourceoutputreactoriscomposed.Thecontrolcircuitbycontrolsthetransformer,thesequentialcontrolelectriccircuitandthebeltarmaturenegativevoltagefeedbackdeliversthesilkmachinecontrolcircuittobecomposed.NBC-250pullsoutthehairstyleweldingmachinerealizesoneofthiskindofweldingmethodweldingapparatuses.Itisbythediodetooktherectifiercell,usingCO2tookthecontrolledatmosphere,sendsinthroughthespecial-purposeweldingtorchthegastheweldingareatheCO2gasremovestheweldingareatheair,andthecoverontheliquidmetalmoltenbath,therealizationprotectivefunction,avoidsintheweldedjointhavingtheblowhole,theoxidecompoundandthenitrideentrappedslag,thusenablestheweldedjointthemetalperformancetoachievetheidealeffect。Thisweldingmachinehasthestabilityhigh,meltspreadingratehigh,熔深big,applicablescopebroad,comparestheweldingrodarcweldingtoconserveenergy50%,theproductivityenhances2times,theweldingdeformationslightly,theanti-plasticityisgoodcharacteristicandsooneaseofoperation,haswidelyappliedtoeachkindofsteelstructureentirepositionwelding,obtainsthewidespreadapplicationintheproductproduction.、河南机电高等专科学校毕业设计说明书3TheNBC-250weldingmachinemainlybyweldsthepowersource,thecontroldevice,deliversthesilkmachine,theweldingtorchandtheairsupplysystemandsooniscomposed,weldingpowersourceisthecorepartial,itsdesignvariablereasonableornotisbiggertotheentiremachineperformanceinfluence.Keywords:NBC-250weldingmachinethree-phasebridgetyperectifierbreakdown河南机电高等专科学校毕业设计说明书4目录摘要...................................................................................................................................1绪论...................................................................................................................................1第一章NBC-250焊机总体介绍......................................................................................41.1NBC-250半自动焊机的特点.............................................................................41.2焊接电源主回路原理.........................................................................................61.3焊机的开关机过程............................................................................................91.4本章小结.............................................................................................................9第二章主回路参数计算...............................................................................................102.1变压器匝数N的计算......................................................................................102.2二极管的选择...................................................................................................112.3档位及各个档位的电压值...............................................................................162.4本章小结...........................................................................................................18第三章送丝控制...........................................................................................................193.1送丝机控制总体介绍.......................................................................................193.2控制电路分析...................................................................................................203.3存在问题及解决方法.......................................................................................223.4本章小结...........................................................................................................22第四章送气机控制.......................................................................................................234.1送气系统作用及构成.......................................................................................234.2送气控制电路...................................................................................................234.3本章小结...........................................................................................................26第五章常见故障分析及处理.......................................................................................395.1焊机故障分析..........................................