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河北工程大学科学学院毕业设计（论文）I摘要自动生产线被应用到工业领域后，称重装置不仅是提供重量数据的简单仪表，而且是工业控制系统和管理系统的一个组成部分。生产线自动称重技术水平的提高，可以推进工业生产的自动化和管理的现代化，缩短作业时间，改善操作条件，降低能源和材料的消耗，提高产品质量以及加强企业管理。生产线自动称重控制系统设计，以PLC为控制核心，称重传感器采集现场重量信号，称重变送器将传感器的信号隔离放大，转换成0-10V的标准信号，EM235模块将这一标准信号转换为相对应的数值。通过实际重量与变速重量、目标重量相比较，利用PWM脉冲控制舵机阀门旋转角度，从而控制下料流量大小。利用电磁铁控制称重斗下料门开合，通过光电开关防止辅助斗物料溢出，利用报警器实现报警功能。整个控制过程分手动操作和自动操作。通过三维力控软件构建远程监控系统，现场情况可以实时显示，监控系统的控制级别高于现场控制的级别。关键词：PLC称重传感器报警器光电开关远程监控河北工程大学科学学院毕业设计（论文）IIABSTRACTAfterautomaticproductionlinewasappliedtoindustryregion,weighingdevicewasnotonlyatechniquesimplicityinstrumenttosupplyweightdata，butalsoapartofindustrialcontrolsystemandsupervisorysystem.Thedevelopmentoftheproductionlineofautomaticweighingcanadvancethemodernizationoftheautomationandmanagementofindustrialproduction,reduceoperatingtime,improvetheoperatingconditions,reducetheconsumptionofenergyandmaterials,improveproductqualityandstrengthenenterprisemanagement.Theproductionlineofautomaticweighingcontrolsystems,PLCforthecontrolofthecore,weighingsensortocollecttheliveweightofthesignal,theweightofthetransmittertothesensorsignalisolationamplifier,andconvertedintostandardsignalsof0-10V,theEM235moduletothestandardsignalisconvertedtocorrespondstothevalue.Byactualweightandvariablespeedweight,targetweight,comparedtothesizeofthePWMpulsestocontroltherotationangleofthesteeringgear,whichcontroltheflowofcutting.Thesystemuseelectromagnetstocontroltheweighingbucketcuttingdooropeningandclosing,usethephotoelectricswitchtopreventtheauxiliarybucketspillage,usethealarmtoachievealarmfunction.Theentirecontrolprocessisdividedintomanualoperationandautomaticoperation.Thesystemusethree-dimensionalforcecontrolsoftwaretobuildtheremotemonitoringsystems.itcandisplayreal-time,themonitoringsystemcontrollevelishigherthanthelevelofsitecontrol.KEYWORDS:PLCweighsensoralarmphotoelectricswitchremotemonitoring河北工程大学科学学院毕业设计（论文）III目录前言................................................................................................1第1章生产线自动称重系统总体设计............................................31.1控制方案的选择...................................................................31.2系统的组成...........................................................................41.3称重系统的功能和工作过程................................................4第2章系统硬件设计.......................................................................62.1PLC的选择...........................................................................62.1.1PLC选型的基本原则..................................................72.1.2西门子S7-200相关模块的确定................................72.2称重传感器的选择...............................................................82.2.1称重传感器类型的选择..............................................82.2.2称重传感器选型的原则..............................................92.2.3托利多MTB-5称重传感器......................................112.3称重变送器的选择.............................................................122.3.1称重变送器的用途和特点........................................122.3.2AT10模拟型称重变送器...........................................122.4舵机的选择.........................................................................152.4.1舵机的规格和选型...................................................152.4.2MG955舵机...............................................................162.5电动机的选择.....................................................................163.6电磁铁的选择......................................................................172.7光电开关的选择..................................................................182.8电铃的选择..........................................................................192.9中间继电器的选择..............................................................202.10断路器的选择....................................................................212.11指示灯的选择....................................................................212.12主电路设计........................................................................222.13控制电路的设计...............................................................23第3章系统软件设计.....................................................................26河北工程大学科学学院毕业设计（论文）IV3.1S7-200PLC的编程软件.....................................................273.2资源分配.............................................................................273.3编写程序..............................................................................29第4章系统监控设计.....................................................................304.1选择组态软件......................................................................304.2构建组态系统......................................................................30结论..............................................................................................35谢辞................................................................................................36参考文献..........................................................................................36附录..............................................................................................38河北工程大学科学学院毕业设计（论文）1前言1．课题研究的研究背景和意义自动生产线被应用到工业领域后，对称重技术提出了新的要求。称重装置不仅是提供重量数据的简单仪表，而且是工业控制系