人教版四年级数学上册第一单元大数的认识 读出亿以内的数教案

MANIPULATORISNOWUSEDASAINDUSTRIALROBOTSINUSE,THECONTROLOBJECTIVESOFTENAPPEAROFTENININDUSTRIALAUTOMATIONINDUSTRIALAUTOMATIONTECHNOLOGYHASGRADUALLYMATURED,ASMATUREATECHNOLOGYLINEHASBEENRAPIDDEVELOPMENTININDUSTRIALAUTOMATIONASASEPARATESUBJECTMANIPULATORAPPLICATIONBEGANTOFILTERINTOWELDING,LOGISTICS,MECHANICALPROCESSING,ANDOTHERINDUSTRIESESPECIALLYATHIGHORVERYLOWTEMPERATURES,FULLOFPOISONOUSGASES,HIGHRADIATIONCASE,ROBOTINSIMILARCIRCUMSTANCESSHOWEDGREATUSEALSOBRINGSGREATCONVENIENCETOTHESTAFFPRECISELYBECAUSEOFTHISROBOTTOGETPEOPLESATTENTIONBEGANTOBEAHIGHDEGREEOFDEVELOPMENTLABORRATES,WORKINGCONDITIONS,LABORINTENSIVEASPECTSOFPROMOTINGDEVELOPMENTBOTHATHOMEANDABROADTODEVELOPTHEPLCPROGRAMMABLELOGICCONTROLLERISINVARIOUSSPECIALCIRCUMSTANCESANDUNDERSPECIALCONDITIONSSETFORMECHANICALDEVICESNOWTURNEDONTHEDEVELOPMENTOFTHEMICROELECTRONICSAUTOMATICCONTROLTECHNOLOGYANDTHERAPIDDEVELOPMENTOFTHETRAINS,THESUCCESSOFPLCHARDWARESOFTWAREANDSIMULATIONCONTROLWINBIGANDSUCCESSFULDEVELOPMENT,NOWCONTINUESTODEVELOPASAFACTORYAUTOMATIONSTANDARDSBECAUSEROBOTSAREGOODDEVELOPMENTOFTHETECHNOLOGYMAKESAGOODOPTIMIZATIONOFPRODUCTIVECAPITAL,ANDROBOTSHOWSTHISUNIQUEADVANTAGES,SUCHASHASGOODCOMPATIBILITY,WIDEAVAILABILITY,HARDWAREISCOMPLETE,ANDPROGRAMMINGTHATCANBEMASTEREDINASHORTTIME,SOINTHECONTEXTOFINDUSTRIALPLCAPPLICATIONSBECAMEUBIQUITOUSMANIPULATORINMANYDEVELOPEDCOUNTRYAGRICULTUREANDINDUSTRYHASBEENAPPLIED,SUCHASTHEUSEOFMECHANICALHARVESTINGLARGEAREASOFFARMLAND,REPEATEDOPERATIONSONTHEHIGHSPEEDLINETHATUSESAROBOTICARM,ANDSOONTODAY,THEHIGHLEVELOFAUTOMATIONCOMBINEDWITHRESTRICTIONSONTHEMANIPULATORDEVELOPMENTLEVELISSLIGHTLYLOWERTHANTHEINTERNATIONALTHEDESIGNISMAINLYARMWELDINGMACHINEBYPLCAUTOMATIONCONTROLTHISOFDESIGNLETDESIGNERSONINSCHOOLBYLEARNOFHASAMUSTOFCONSOLIDATION,UNDERSTANDHASSOMEUSUALLYDIDNTOPPORTUNITIESAWARENESSINWORLDRANGEWITHINSOMELEADINGLEVELOFKNOWLEDGEHASHASMUSTAWARENESS,HOPEDESIGNERSCANINYIHOUOFDESIGNINTHECANSUCCESSOFUSINGINTHISDESIGNINTHEPROCEEDSOFEXPERIENCE12MANIPULATORINBOTHATHOMEANDABROADOFRESEARCHPROFILEAUTOMATIONMECHANICALARMRESEARCHBEGANYU20THCENTURYMEDIUMTERM,AFTERYEARSWITHWITHCOMPUTERANDAUTOMATIONTECHNOLOGYOFDEVELOPMENT,MAKESMECHANICALARMONTHEGRANDSTAGEOFINDUSTRIALAUTOMATIONANDSHINE,GRADUALLYBECAMEANINDUSTRIALEVALUATIONSTANDARDS,ANDITSIMPORTANCECANBESEENNOWORIGINALROBOTICARMSPENTMOSTOFMASSPRODUCTIONANDUSEONTHEPRODUCTIONLINE,WHICHISPROGRAMMEDROBOTICARMASTHEFIRSTGENERATIONOFMANIPULATORPOSITIONCONTROLSYSTEMSMAINFEATURES,ALTHOUGHNOTBACKSEVERALGENERATIONSTHATCANDETECTTHEEXTERNALENVIRONMENT,BUTCANSTILLSUCCESSFULLYCOMPLETELIKEWELDING,PAINTING,DELIVERYASWELLASFORMATERIALSSIMPLEMOVEMENTSSECONDGENERATIONMECHANICALARMSAREEQUIPPEDWITHSENSORSANDMANIPULATORSHAVETHEENVIRONMENTTHEREISACERTAINAMOUNTOF“SENSE“,WHENTHEMECHANICALARMISTOUSETHEPROGRAMASABASISDIFFERENCEISTHATTHEROBOTBEGANDMANIPULATORCONTROLMODEANDPROGRAMMABLECONTROLLERSINTRODUCTION21SELECTDISCUSSIONWITHMANIPULATORCONTROL211CLASSIFICATIONOFCONTROLRELAYSANDDISCRETEELECTRONICCIRCUITCANCONTROLOLDINDUSTRIALEQUIPMENT,BUTALSOMORECOMMONMAINLYTHESETWORELATIVELYCHEAPANDYOUCANMEETTHEOLDFASHIONED,SIMPLEORSIMPLEINDUSTRIALEQUIPMENTSOHECANSEETHEMNOW,HOWEVERTHESETWOCONTROLMODESRELAYANDDISCRETEELECTRONICCIRCUITSARETHESEFATALFLAWS1CANNOTADAPTTOTHECOMPLEXLOGICCONTROL,2ONLYFORTHECURRENTPROJECT,THELACKOFCOMPATIBILITYAND3NOTREFORMINGTHESYSTEMWITHEQUIPMENTIMPROVEMENTSSPRINGFORTHEDEVELOPMENTOFCHINASMODERNINDUSTRIALAUTOMATIONTECHNOLOGYTHESUBSTANTIALINCREASEINTHELEVELOFINDUSTRIALAUTOMATION,COMPLETEDTHEPERFECTRELAYOFTHECOMPUTERTOOMUCHINTERMSOFCONTROLLINGTHECOMPUTERSHOWEDHISTWOGREATADVANTAGES1EACHOFTHEHARDWARECANBEINSTALLEDONONEORMOREMICROPROCESSORS2THEOFFICIALDESIGNEROFTHESOFTWAREWRITINGCONTENTCONTROLISALLABOUTNOWINSEVERALWAYSINTHECONTEXTOFINDUSTRIALAUTOMATIONCANOFTENBESEENINTHREEWAYS1PROGRAMMABLELOGICALCONTROLLERREFERREDTOASIPC2DISTRIBUTEDCONTROLSYSTEMDCSFORSHORT,AND3THEPROGRAMMABLELOGICALCONTROLLERPLCFORSHORT212PLCANDTHEIPCANDDCSCONTRASTCONTRAST1,EACHOFTHETHREETECHNOLOGIESOFORIGINSANDDEVELOPMENTREQUIREMENTSFORFASTDATAPROCESSINGMAKESITINVENTEDTHECOMPUTERTHEMENBROUGHTINTERMSOFHARDWARETHERE,USINGAHIGHLEVELOFSTANDARDIZATION,CANUSEMORECOMPATIBILITYTOOLS,ISARICHSOFTWARERESOURCES,ESPECIALLYTHENEEDFORIMMEDIACYINOPERATIONALSYSTEMSSOTHECOMPUTERCANEFFECTIVELYCONTROLISUSEDTOCONTROLANDMEETITSSPEED,ONTHEVIRTUALMODEL,REALTIMEANDINCOMPUTATIONALREQUIREMENTSDISTRIBUTEDSYSTEMSTARTEDWITHACONTROLSYSTEMFORINDUSTRIALAUTOMATICINSTRUMENTUSEDTOCONTROL,WHEREASNOWITISSUCCESSFULLYDEVELOPEDINTOINDUSTRIALCONTROLCOMPUTERUSEDASACENTRALCOLLECTIONANDDISTRIBUTIONSYSTEMANDTRANSITIONOFDISTRIBUTEDCONTROLSYSTEMINANALOGUEHANDLING,LOOPCONTROL,HASBEGUNTOREFLECTTHEUSEOFAHUGEADVANTAGETHOUGHDISTRIBUTEDSYSTEMHASGREATADVANTAGESINLOOPREGULATION,BUTONLYASAMEANSOFCONTINUOUSPROCESSCONTROLOPTIMIZATIONOFPLCISTHECORRESPONDINGRELAYNEEDSWASBORN,ITSMAINUSEINTHEWORKORDERCONTROL,EARLYPRIMARYISREPLACEDRELAYTHISHULKINGSYSTEM,FOCUSEDONTHESWITCHCONTROLLINGTHERUNNINGORDEROFFUNCTIONSMARKEDBYTHEMICROPROCESSORINTHEEARLY1970OFTHE20THCENTURYEMERGED,MICROELECTRONICSTECHNOLOGYHASDEVELOPEDRAPIDLY,PEOPLESOONMICROELECTRONICSPROCESSINGTECHNOLOGYWILLBEUSEDINTHEPROGRAMMABLELOGICALCONTROLLERTHATIS课题大数的认识读出亿以内的数教学目标1、会准确地读出亿以内的数，掌握读亿以内数的方法。2、让学生在自主尝试和交流中掌握读数方法，加强学生感于尝试的数学精神，善于交流、敢于表达。3、进一步加强学生的数感意识，初步渗透学生用已有知识进行学习的方法重点难点1、会读含两级的数。2、知道万级的数和个级的数在读法上的不同。3、会读数位上出现0的数。教学过程第2课时一、创设情境1、师同学们，你们都有哪些爱好呢（生看书、画画、打电脑）同学们的爱好可真多老师也有一个爱好，那就是收集数据。课件展示景观图珠穆朗玛峰高8848米。长江是世界第三大河，全长六千三百千米。东方明珠电视塔高四百六十八米。2005年末统计东营市总人口1804964人。2、看了这些数据，你知道了什么3、你能不能把这些数据读出来有没有不会读的，试试看。找出北京市人口138190004、说说你是怎样读这些数的（对照数位顺序表，从高到低）同学们的读法都很好，现在请同学们把你们课前收集的数据拿出来，我们利用这节课来研究一下他们的读法。板书课题亿以内数的读法设计意图先由学生感兴趣的图片资料导入，能激发学生的学习兴趣，并能MANIPULATORISNOWUSEDASAINDUSTRIALROBOTSINUSE,THECONTROLOBJECTIVESOFTENAPPEAROFTENININDUSTRIALAUTOMATIONINDUSTRIALAUTOMATIONTECHNOLOGYHASGRADUALLYMATURED,ASMATUREATECHNOLOGYLINEHASBEENRAPIDDEVELOPMENTININDUSTRIALAUTOMATIONASASEPARATESUBJECTMANIPULATORAPPLICATIONBEGANTOFILTERINTOWELDING,LOGISTICS,MECHANICALPROCESSING,ANDOTHERINDUSTRIESESPECIALLYATHIGHORVERYLOWTEMPERATURES,FULLOFPOISONOUSGASES,HIGHRADIATIONCASE,ROBOTINSIMILARCIRCUMSTANCESSHOWEDGREATUSEALSOBRINGSGREATCONVENIENCETOTHESTAFFPRECISELYBECAUSEOFTHISROBOTTOGETPEOPLESATTENTIONBEGANTOBEAHIGHDEGREEOFDEVELOPMENTLABORRATES,WORKINGCONDITIONS,LABORINTENSIVEASPECTSOFPROMOTINGDEVELOPMENTBOTHATHOMEANDABROADTODEVELOPTHEPLCPROGRAMMABLELOGICCONTROLLERISINVARIOUSSPECIALCIRCUMSTANCESANDUNDERSPECIALCONDITIONSSETFORMECHANICALDEVICESNOWTURNEDONTHEDEVELOPMENTOFTHEMICROELECTRONICSAUTOMATICCONTROLTECHNOLOGYANDTHERAPIDDEVELOPMENTOFTHETRAINS,THESUCCESSOFPLCHARDWARESOFTWAREANDSIMULATIONCONTROLWINBIGANDSUCCESSFULDEVELOPMENT,NOWCONTINUESTODEVELOPASAFACTORYAUTOMATIONSTANDARDSBECAUSEROBOTSAREGOODDEVELOPMENTOFTHETECHNOLOGYMAKESAGOODOPTIMIZATIONOFPRODUCTIVECAPITAL,ANDROBOTSHOWSTHISUNIQUEADVANTAGES,SUCHASHASGOODCOMPATIBILITY,WIDEAVAILABILITY,HARDWAREISCOMPLETE,ANDPROGRAMMINGTHATCANBEMASTEREDINASHORTTIME,SOINTHECONTEXTOFINDUSTRIALPLCAPPLICATIONSBECAMEUBIQUITOUSMANIPULATORINMANYDEVELOPEDCOUNTRYAGRICULTUREANDINDUSTRYHASBEENAPPLIED,SUCHASTHEUSEOFMECHANICALHARVESTINGLARGEAREASOFFARMLAND,REPEATEDOPERATIONSONTHEHIGHSPEEDLINETHATUSESAROBOTICARM,ANDSOONTODAY,THEHIGHLEVELOFAUTOMATIONCOMBINEDWITHRESTRICTIONSONTHEMANIPULATORDEVELOPMENTLEVELISSLIGHTLYLOWERTHANTHEINTERNATIONALTHEDESIGNISMAINLYARMWELDINGMACHINEBYPLCAUTOMATIONCONTROLTHISOFDESIGNLETDESIGNERSONINSCHOOLBYLEARNOFHASAMUSTOFCONSOLIDATION,UNDERSTANDHASSOMEUSUALLYDIDNTOPPORTUNITIESAWARENESSINWORLDRANGEWITHINSOMELEADINGLEVELOFKNOWLEDGEHASHASMUSTAWARENESS,HOPEDESIGNERSCANINYIHOUOFDESIGNINTHECANSUCCESSOFUSINGINTHISDESIGNINTHEPROCEEDSOFEXPERIENCE12MANIPULATORINBOTHATHOMEANDABROADOFRESEARCHPROFILEAUTOMATIONMECHANICALARMRESEARCHBEGANYU20THCENTURYMEDIUMTERM,AFTERYEARSWITHWITHCOMPUTERANDAUTOMATIONTECHNOLOGYOFDEVELOPMENT,MAKESMECHANICALARMONTHEGRANDSTAGEOFINDUSTRIALAUTOMATIONANDSHINE,GRADUALLYBECAMEANINDUSTRIALEVALUATIONSTANDARDS,ANDITSIMPORTANCECANBESEENNOWORIGINALROBOTICARMSPENTMOSTOFMASSPRODUCTIONANDUSEONTHEPRODUCTIONLINE,WHICHISPROGRAMMEDROBOTICARMASTHEFIRSTGENERATIONOFMANIPULATORPOSITIONCONTROLSYSTEMSMAINFEATURES,ALTHOUGHNOTBACKSEVERALGENERATIONSTHATCANDETECTTHEEXTERNALENVIRONMENT,BUTCANSTILLSUCCESSFULLYCOMPLETELIKEWELDING,PAINTING,DELIVERYASWELLASFORMATERIALSSIMPLEMOVEMENTSSECONDGENERATIONMECHANICALARMSAREEQUIPPEDWITHSENSORSANDMANIPULATORSHAVETHEENVIRONMENTTHEREISACERTAINAMOUNTOF“SENSE“,WHENTHEMECHANICALARMISTOUSETHEPROGRAMASABASISDIFFERENCEISTHATTHEROBOTBEGANDMANIPULATORCONTROLMODEANDPROGRAMMABLECONTROLLERSINTRODUCTION21SELECTDISCUSSIONWITHMANIPULATORCONTROL211CLASSIFICATIONOFCONTROLRELAYSANDDISCRETEELECTRONICCIRCUITCANCONTROLOLDINDUSTRIALEQUIPMENT,BUTALSOMORECOMMONMAINLYTHESETWORELATIVELYCHEAPANDYOUCANMEETTHEOLDFASHIONED,SIMPLEORSIMPLEINDUSTRIALEQUIPMENTSOHECANSEETHEMNOW,HOWEVERTHESETWOCONTROLMODESRELAYANDDISCRETEELECTRONICCIRCUITSARETHESEFATALFLAWS1CANNOTADAPTTOTHECOMPLEXLOGICCONTROL,2ONLYFORTHECURRENTPROJECT,THELACKOFCOMPATIBILITYAND3NOTREFORMINGTHESYSTEMWITHEQUIPMENTIMPROVEMENTSSPRINGFORTHEDEVELOPMENTOFCHINASMODERNINDUSTRIALAUTOMATIONTECHNOLOGYTHESUBSTANTIALINCREASEINTHELEVELOFINDUSTRIALAUTOMATION,COMPLETEDTHEPERFECTRELAYOFTHECOMPUTERTOOMUCHINTERMSOFCONTROLLINGTHECOMPUTERSHOWEDHISTWOGREATADVANTAGES1EACHOFTHEHARDWARECANBEINSTALLEDONONEORMOREMICROPROCESSORS2THEOFFICIALDESIGNEROFTHESOFTWAREWRITINGCONTENTCONTROLISALLABOUTNOWINSEVERALWAYSINTHECONTEXTOFINDUSTRIALAUTOMATIONCANOFTENBESEENINTHREEWAYS1PROGRAMMABLELOGICALCONTROLLERREFERREDTOASIPC2DISTRIBUTEDCONTROLSYSTEMDCSFORSHORT,AND3THEPROGRAMMABLELOGICALCONTROLLERPLCFORSHORT212PLCANDTHEIPCANDDCSCONTRASTCONTRAST1,EACHOFTHETHREETECHNOLOGIESOFORIGINSANDDEVELOPMENTREQUIREMENTSFORFASTDATAPROCESSINGMAKESITINVENTEDTHECOMPUTERTHEMENBROUGHTINTERMSOFHARDWARETHERE,USINGAHIGHLEVELOFSTANDARDIZATION,CANUSEMORECOMPATIBILITYTOOLS,ISARICHSOFTWARERESOURCES,ESPECIALLYTHENEEDFORIMMEDIACYINOPERATIONALSYSTEMSSOTHECOMPUTERCANEFFECTIVELYCONTROLISUSEDTOCONTROLANDMEETITSSPEED,ONTHEVIRTUALMODEL,REALTIMEANDINCOMPUTATIONALREQUIREMENTSDISTRIBUTEDSYSTEMSTARTEDWITHACONTROLSYSTEMFORINDUSTRIALAUTOMATICINSTRUMENTUSEDTOCONTROL,WHEREASNOWITISSUCCESSFULLYDEVELOPEDINTOINDUSTRIALCONTROLCOMPUTERUSEDASACENTRALCOLLECTIONANDDISTRIBUTIONSYSTEMANDTRANSITIONOFDISTRIBUTEDCONTROLSYSTEMINANALOGUEHANDLING,LOOPCONTROL,HASBEGUNTOREFLECTTHEUSEOFAHUGEADVANTAGETHOUGHDISTRIBUTEDSYSTEMHASGREATADVANTAGESINLOOPREGULATION,BUTONLYASAMEANSOFCONTINUOUSPROCESSCONTROLOPTIMIZATIONOFPLCISTHECORRESPONDINGRELAYNEEDSWASBORN,ITSMAINUSEINTHEWORKORDERCONTROL,EARLYPRIMARYISREPLACEDRELAYTHISHULKINGSYSTEM,FOCUSEDONTHESWITCHCONTROLLINGTHERUNNINGORDEROFFUNCTIONSMARKEDBYTHEMICROPROCESSORINTHEEARLY1970OFTHE20THCENTURYEMERGED,MICROELECTRONICSTECHNOLOGYHASDEVELOPEDRAPIDLY,PEOPLESOONMICROELECTRONICSPROCESSINGTECHNOLOGYWILLBEUSEDINTHEPROGRAMMABLELOGICALCONTROLLERTHATIS对旧知识进行系统的复习。二、探究新知1、展示学生收集的数据。例如长江流域的面积是1807199平方千米；赤道长40076千米；马里亚纳海沟距离海平面11034米；2000年我国进行的第五次人口普查显示全国总人口约为1295330000人。祖国大陆约有1265830000人，北京市约有13820000人，天津市约有10010000人。2、把数据进行分类。老师组织学生进行小组合作学习请把以上数据进行分类。小组学习后，可能会有几种分类情况（1）按照位数分类，相同位数的数分成一类。（2）按照数据所表示的意思分类，如表示地理常识的分一类，表示人口的分成一类。（3）按照0的个数或位置分类，中间有0的数分成一类，末尾有0的数为一类。学生怎么分都可以，只要能说出道理。分完后学生试着读一读。设计意图用学生自己收集的资料进行试读，能调动学生学习的积极性，对教学新知识起铺垫的作用。3、万以上只含一级数的读法。（1）出示数位表先让学生快速的读出2496。（2）对着数位表出示24960000这个八位数。（3）师提问这是一个几位数（八位数）它的最高位是什么数位（千万位）哪些数位上有数字分别是几这个八位数的数位在哪几个数级（两个数级，分别是个级和万级）（4）学生尝试自己读一读。（5）集体交流。（6）再次让学生尝试读法，并请读得准确的学生示范读法，教师应注意及时纠正不正确的读法。（板书二千四百九十六万）设计意图呈现一个学生讨论交流“含两级的数怎么读”的情境，突出万级的数和个级的数在读法上的不同地方。由于初次接触大数的读法，学生可能会受到万以内数读法的迁移，先读数字，再读数位。针对这种情况，应注意引导当万级上有数的时候，万级的数也像读个级一样读，然后再读它的数级。4、万以上的数含两个数级，数位上出现0的数的读法。A、不读零。（1）对着数位表出示七位数6407000。（2）提问这个数含哪些数级（个级、万级）MANIPULATORISNOWUSEDASAINDUSTRIALROBOTSINUSE,THECONTROLOBJECTIVESOFTENAPPEAROFTENININDUSTRIALAUTOMATIONINDUSTRIALAUTOMATIONTECHNOLOGYHASGRADUALLYMATURED,ASMATUREATECHNOLOGYLINEHASBEENRAPIDDEVELOPMENTININDUSTRIALAUTOMATIONASASEPARATESUBJECTMANIPULATORAPPLICATIONBEGANTOFILTERINTOWELDING,LOGISTICS,MECHANICALPROCESSING,ANDOTHERINDUSTRIESESPECIALLYATHIGHORVERYLOWTEMPERATURES,FULLOFPOISONOUSGASES,HIGHRADIATIONCASE,ROBOTINSIMILARCIRCUMSTANCESSHOWEDGREATUSEALSOBRINGSGREATCONVENIENCETOTHESTAFFPRECISELYBECAUSEOFTHISROBOTTOGETPEOPLESATTENTIONBEGANTOBEAHIGHDEGREEOFDEVELOPMENTLABORRATES,WORKINGCONDITIONS,LABORINTENSIVEASPECTSOFPROMOTINGDEVELOPMENTBOTHATHOMEANDABROADTODEVELOPTHEPLCPROGRAMMABLELOGICCONTROLLERISINVARIOUSSPECIALCIRCUMSTANCESANDUNDERSPECIALCONDITIONSSETFORMECHANICALDEVICESNOWTURNEDONTHEDEVELOPMENTOFTHEMICROELECTRONICSAUTOMATICCONTROLTECHNOLOGYANDTHERAPIDDEVELOPMENTOFTHETRAINS,THESUCCESSOFPLCHARDWARESOFTWAREANDSIMULATIONCONTROLWINBIGANDSUCCESSFULDEVELOPMENT,NOWCONTINUESTODEVELOPASAFACTORYAUTOMATIONSTANDARDSBECAUSEROBOTSAREGOODDEVELOPMENTOFTHETECHNOLOGYMAKESAGOODOPTIMIZATIONOFPRODUCTIVECAPITAL,ANDROBOTSHOWSTHISUNIQUEADVANTAGES,SUCHASHASGOODCOMPATIBILITY,WIDEAVAILABILITY,HARDWAREISCOMPLETE,ANDPROGRAMMINGTHATCANBEMASTEREDINASHORTTIME,SOINTHECONTEXTOFINDUSTRIALPLCAPPLICATIONSBECAMEUBIQUITOUSMANIPULATORINMANYDEVELOPEDCOUNTRYAGRICULTUREANDINDUSTRYHASBEENAPPLIED,SUCHASTHEUSEOFMECHANICALHARVESTINGLARGEAREASOFFARMLAND,REPEATEDOPERATIONSONTHEHIGHSPEEDLINETHATUSESAROBOTICARM,ANDSOONTODAY,THEHIGHLEVELOFAUTOMATIONCOMBINEDWITHRESTRICTIONSONTHEMANIPULATORDEVELOPMENTLEVELISSLIGHTLYLOWERTHANTHEINTERNATIONALTHEDESIGNISMAINLYARMWELDINGMACHINEBYPLCAUTOMATIONCONTROLTHISOFDESIGNLETDESIGNERSONINSCHOOLBYLEARNOFHASAMUSTOFCONSOLIDATION,UNDERSTANDHASSOMEUSUALLYDIDNTOPPORTUNITIESAWARENESSINWORLDRANGEWITHINSOMELEADINGLEVELOFKNOWLEDGEHASHASMUSTAWARENESS,HOPEDESIGNERSCANINYIHOUOFDESIGNINTHECANSUCCESSOFUSINGINTHISDESIGNINTHEPROCEEDSOFEXPERIENCE12MANIPULATORINBOTHATHOMEANDABROADOFRESEARCHPROFILEAUTOMATIONMECHANICALARMRESEARCHBEGANYU20THCENTURYMEDIUMTERM,AFTERYEARSWITHWITHCOMPUTERANDAUTOMATIONTECHNOLOGYOFDEVELOPMENT,MAKESMECHANICALARMONTHEGRANDSTAGEOFINDUSTRIALAUTOMATIONANDSHINE,GRADUALLYBECAMEANINDUSTRIALEVALUATIONSTANDARDS,ANDITSIMPORTANCECANBESEENNOWORIGINALROBOTICARMSPENTMOSTOFMASSPRODUCTIONANDUSEONTHEPRODUCTIONLINE,WHICHISPROGRAMMEDROBOTICARMASTHEFIRSTGENERATIONOFMANIPULATORPOSITIONCONTROLSYSTEMSMAINFEATURES,ALTHOUGHNOTBACKSEVERALGENERATIONSTHATCANDETECTTHEEXTERNALENVIRONMENT,BUTCANSTILLSUCCESSFULLYCOMPLETELIKEWELDING,PAINTING,DELIVERYASWELLASFORMATERIALSSIMPLEMOVEMENTSSECONDGENERATIONMECHANICALARMSAREEQUIPPEDWITHSENSORSANDMANIPULATORSHAVETHEENVIRONMENTTHEREISACERTAINAMOUNTOF“SENSE“,WHENTHEMECHANICALARMISTOUSETHEPROGRAMASABASISDIFFERENCEISTHATTHEROBOTBEGANDMANIPULATORCONTROLMODEANDPROGRAMMABLECONTROLLERSINTRODUCTION21SELECTDISCUSSIONWITHMANIPULATORCONTROL211CLASSIFICATIONOFCONTROLRELAYSANDDISCRETEELECTRONICCIRCUITCANCONTROLOLDINDUSTRIALEQUIPMENT,BUTALSOMORECOMMONMAINLYTHESETWORELATIVELYCHEAPANDYOUCANMEETTHEOLDFASHIONED,SIMPLEORSIMPLEINDUSTRIALEQUIPMENTSOHECANSEETHEMNOW,HOWEVERTHESETWOCONTROLMODESRELAYANDDISCRETEELECTRONICCIRCUITSARETHESEFATALFLAWS1CANNOTADAPTTOTHECOMPLEXLOGICCONTROL,2ONLYFORTHECURRENTPROJECT,THELACKOFCOMPATIBILITYAND3NOTREFORMINGTHESYSTEMWITHEQUIPMENTIMPROVEMENTSSPRINGFORTHEDEVELOPMENTOFCHINASMODERNINDUSTRIALAUTOMATIONTECHNOLOGYTHESUBSTANTIALINCREASEINTHELEVELOFINDUSTRIALAUTOMATION,COMPLETEDTHEPERFECTRELAYOFTHECOMPUTERTOOMUCHINTERMSOFCONTROLLINGTHECOMPUTERSHOWEDHISTWOGREATADVANTAGES1EACHOFTHEHARDWARECANBEINSTALLEDONONEORMOREMICROPROCESSORS2THEOFFICIALDESIGNEROFTHESOFTWAREWRITINGCONTENTCONTROLISALLABOUTNOWINSEVERALWAYSINTHECONTEXTOFINDUSTRIALAUTOMATIONCANOFTENBESEENINTHREEWAYS1PROGRAMMABLELOGICALCONTROLLERREFERREDTOASIPC2DISTRIBUTEDCONTROLSYSTEMDCSFORSHORT,AND3THEPROGRAMMABLELOGICALCONTROLLERPLCFORSHORT212PLCANDTHEIPCANDDCSCONTRASTCONTRAST1,EACHOFTHETHREETECHNOLOGIESOFORIGINSANDDEVELOPMENTREQUIREMENTSFORFASTDATAPROCESSINGMAKESITINVENTEDTHECOMPUTERTHEMENBROUGHTINTERMSOFHARDWARETHERE,USINGAHIGHLEVELOFSTANDARDIZATION,CANUSEMORECOMPATIBILITYTOOLS,ISARICHSOFTWARERESOURCES,ESPECIALLYTHENEEDFORIMMEDIACYINOPERATIONALSYSTEMSSOTHECOMPUTERCANEFFECTIVELYCONTROLISUSEDTOCONTROLANDMEETITSSPEED,ONTHEVIRTUALMODEL,REALTIMEANDINCOMPUTATIONALREQUIREMENTSDISTRIBUTEDSYSTEMSTARTEDWITHACONTROLSYSTEMFORINDUSTRIALAUTOMATICINSTRUMENTUSEDTOCONTROL,WHEREASNOWITISSUCCESSFULLYDEVELOPEDINTOINDUSTRIALCONTROLCOMPUTERUSEDASACENTRALCOLLECTIONANDDISTRIBUTIONSYSTEMANDTRANSITIONOFDISTRIBUTEDCONTROLSYSTEMINANALOGUEHANDLING,LOOPCONTROL,HASBEGUNTOREFLECTTHEUSEOFAHUGEADVANTAGETHOUGHDISTRIBUTEDSYSTEMHASGREATADVANTAGESINLOOPREGULATION,BUTONLYASAMEANSOFCONTINUOUSPROCESSCONTROLOPTIMIZATIONOFPLCISTHECORRESPONDINGRELAYNEEDSWASBORN,ITSMAINUSEINTHEWORKORDERCONTROL,EARLYPRIMARYISREPLACEDRELAYTHISHULKINGSYSTEM,FOCUSEDONTHESWITCHCONTROLLINGTHERUNNINGORDEROFFUNCTIONSMARKEDBYTHEMICROPROCESSORINTHEEARLY1970OFTHE20THCENTURYEMERGED,MICROELECTRONICSTECHNOLOGYHASDEVELOPEDRAPIDLY,PEOPLESOONMICROELECTRONICSPROCESSINGTECHNOLOGYWILLBEUSEDINTHEPROGRAMMABLELOGICALCONTROLLERTHATIS（3）用刚才掌握的读数方法学生在小组内交流尝试读这个数。（4）集体反馈。（5）让学生介绍方法万级上的数像读个级的数一样读，再读它的数级；个级上出现的数像以前那样先读数字，再读数位。（6）提问这里的四个零读出来了没有（7）引导得出在数级末尾的零不用读。学生把读法填写在课本上。（板书六百四十万七千）B、要读零。（1）在数位表上出示八位数10030040。（2）学生尝试自己读出这个数。（3）集体交流。（用前面的方法学生应该能独立读出这个数，但要注意千位上的零。）（4）提问这里有5个零，哪些零没有读出来哪些零读出来了为什么独立思考，有想法之后再和小伙伴交流。（引导得出除了千位上的零读出来了，其它数位的零都没有读出来，因为排在数级末尾的零不读，在中间的零要读。）（5）请学生介绍读这些亿以内数的方法或经验。（6）集体交流可能会得出读含两级的数时，万级以上的数和个级上的数一样读，再读万级的数级，最后读个级的数。当数含有零时，在数级末尾的零不要读，在数级中间的零要读出来，连续几个零都只读一个零。读数时，要从高位读起，依次往低位读。在读数时，可以从可边起，每四个数划分一个数级，这样读的时候不会错，而且也容易读清楚。设计意图每级中间或未尾有0的数的读法仍是难点，教材没有给出答案，而是呈现“由一个学生提出问题”的情境，便于学生合作、讨论探究。三、方法应用1、师利用四位分级的方法，我们一起来做几道题目。试一试先分级，再把数读出来。（口头）63700、5095004、8480000、253056040（自由轻声读，同桌互读，指名读。）归纳分级时从右往左、四位一级。数中间有1个0，或连续有几个0，只读一个0，每一级末尾的0都不读出来。2、读一读第八页第2、3题。设计意图还原情境中的内容，让学生小组分工合作解决问题，亲身体验合作学习的快乐和成功的喜悦。关注学生是否已扎实掌握亿以内数的读法。四、梳理知识，总结升华谈话这节课你有什么收获呢设计意图对本节课的学习做一个简单的回顾整理，形成基本的知识网络，整理学习思路，掌握亿以内数的读法，为后面的学习打好基础。五、课堂检测课堂检测A。MANIPULATORISNOWUSEDASAINDUSTRIALROBOTSINUSE,THECONTROLOBJECTIVESOFTENAPPEAROFTENININDUSTRIALAUTOMATIONINDUSTRIALAUTOMATIONTECHNOLOGYHASGRADUALLYMATURED,ASMATUREATECHNOLOGYLINEHASBEENRAPIDDEVELOPMENTININDUSTRIALAUTOMATIONASASEPARATESUBJECTMANIPULATORAPPLICATIONBEGANTOFILTERINTOWELDING,LOGISTICS,MECHANICALPROCESSING,ANDOTHERINDUSTRIESESPECIALLYATHIGHORVERYLOWTEMPERATURES,FULLOFPOISONOUSGASES,HIGHRADIATIONCASE,ROBOTINSIMILARCIRCUMSTANCESSHOWEDGREATUSEALSOBRINGSGREATCONVENIENCETOTHESTAFFPRECISELYBECAUSEOFTHISROBOTTOGETPEOPLE