传输带动态称重系统设计-毕业设计.

摘要I摘要随着传感器技术、电子技术和微机技术的崛起，动态称重技术得到了迅速发展。动态称重系统在数字化，智能化等方面有长足的进步，称重系统的研究与开发也进入了一个崭新的阶段。传输带动态称重系统是对传输带上的散状固体物料或粉料进行连续称量的系统，在电力、化工、煤炭、粮食等行业都有较广泛的应用，市场需求巨大。但是，我国自行研制的相关产品普遍功能单一，精度不高。所以改善现有称重装置、开发研究功能齐全的动态称重系统是势在必行的。设计了一套基于单片机的传输带动态称重系统，很好的解决了上述问题。首先对硬件电路所需的器件进行介绍。说明系统所应用的微处理器，模数转换器类型，具体提出了系统硬件和软件的设计方法，给出了数据处理算法和其编程的设计。系统使用24位精度模/数转换芯片AD7730转换称重传感器信号，保证了数据转换的高精度。所以该系统能够有效提高动态称重系统的计量精度，并且系统功能较完善，系统扩展了现场总线接口，很好的满足了工业自动化和管理现代化的需求。关键词：动态称重传输带AD7730现场总线AbstractIIAbstractWiththedevelopmentoftechnologyofsensor,electronicandcomputer,thedynamicweighingtechnologyisdevelopingrapidly.Weighingsystemmadesignificantprogressinthedigitalandintelligent,theresearchofWeighingsystemhasenteredanewphase.Belteddynamicweightequipmentisdesignedforcontinuousweighingthebulksolidsorpowdersonconveyorbelt.Anditiswidelyusedinthefieldsofelectricity,chemical,coalandfood.However,ourrelatedproductsgenerallywithsinglefunctionandlowprecision.Therefore,theimprovementofexistingweighingdevices,researchanddevelopmentfunctionaldynamicweighingsystemisimperative.ThispaperpresentsabelteddyamicweighingsystembasedonSCM,whichisagoodsolutiontothisproblem.Inthispaper,theoverallstructureoftheweighingsystemispresentfirst,anddetailedanalysisofthesystemmodelandworkingprinciple.Itanalyzesthecauseofdynamicmeasurementerrors,andbuildsamathmematicalmodelfordynamicmeasurementerrorsofsingle-idlerelectronicbeltconveyorscale.Accordingtothemodel,theproposedapproachusealgorithmtocorrecterrors.Solvedtheproblemoflowdynamicmeasurementaccuracy.Thenthedesignofsystemhardwareandsoftwareispresent.Anddataprocessingalgorithmsandtheirprogrammingdesign.Systemuses24-bitprecisionA/DconverterAD7730converttheweighingsignaltoensurehigh-precisionmeasurementresults.Thesystempresentedinthispaperischaracterizedbyhighprecisionandgoodstability.AndwiththeProfibusinterface,thissystemwaswellpositionedtomeettherequirementsofindustrialautomationandmanagementmodernization.Keywords：DynamicweighingTransmissionbeltAD7730Profibus目录III目录摘要.............................................................................................................................................IAbstract...................................................................................................................................II1绪论........................................................................................................................................11.1背景及意义.....................................................................................................................11.1.1背景...........................................................................................................................11.1.2意义...........................................................................................................................11.2国内外发展现状.............................................................................................................21.2.1国内外称重技术发展现状.......................................................................................21.2.2国内外称重技术发展趋势.......................................................................................31.3主要工作及论文结构.....................................................................................................52系统整体设计........................................................................................................................62.1系统结构概述.................................................................................................................62.2动态称重计量原理.........................................................................................................62.3小结.................................................................................................................................83系统硬件电路设计................................................................................................................93.1系统硬件概述.................................................................................................................93.2系统微处理器.................................................................................................................93.3系统模数转换器.............................................................................................................93.4数据采集电路通信接口设计......................................................................................113.4.1RS-232C标准.........................................................................................................113.4.2MAX232芯片简介..............................................................................................113.4.3串口通信接口电路设计.........................................................................................113.5程序下载线连接..........................................................................................................123.6传感器接口设计..........................................................................................................133.7Profibus-DP接口扩展...........................................................................................