共查询到18条相似文献,搜索用时 203 毫秒
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【目的】在三菱FX系列PLC编程软件GX Developer中使用SFC编程直接画出自动盖章机控制系统的SFC图,简化操作流程,提高设计精度。【方法】本研究以自动盖章机为研究对象,选用三菱FX1s-10MT型PLC作为其控制器,设计了该机器的气压传动回路图、控制系统的控制电路图、SFC顺序功能图及梯形图程序,并分析了三菱FX系列PLC顺序功能图编程方法的优点。【结果】样机制作完成后,进行控制系统接线调试试验,发现该程序能够完成机器的预订功能,验证了SFC编程方法的正确性,以及所设计的自动盖章机控制系统的可行性。【结论】样机实验过程也是用SFC方法解决问题的过程,可以扩大可编程控制技术和自动化技术的应用范围,具有普遍性和可推广价值。 相似文献
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SFC图转换成梯形图的方法探讨 总被引:1,自引:0,他引:1
顺序功能图(Sequential Function Chart)是PLC程序设计语言之一,简称为SFC图.由于其具有结构清晰、直观简便、易于阅读和维护等特点,在工业顺序控制场合中被广泛应用.通过实例介绍了SFC图转换成梯形图的方法,首先分配存储器地址,然后确定转移条件,最后转换工作步和输出动作. 相似文献
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文章对SFC装置的组成和各部件的作用做了介绍,结合江苏华电扬州发电有限公司M701F4燃气轮机发电机组中对SFC装置的实际应用展开探讨,并对缩短SFC正常启动机组过程清吹时间提出相关建议,供参考。 相似文献
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充分发挥轴测图优势提高工程图学教学质量 总被引:1,自引:0,他引:1
轴测图在工程图学教学中所发挥的重要作用已经越来越明显。为此,就如何使轴测图在工程图学教学中保持连续性,如何把轴测图及时、合理地分散、渗透、融合加入到有关内容的教学中,进行了研究与实践,提出了一些行之有效的具体想法与做法,强调指出了这是一项很有意义的教学改革。 相似文献
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按水力学原理测得新研制的7种微管件的局部水头损失系数(C)值较同形状的大管件值大。将实测内任1~8mm微管资料计算的沿程阻力系数(λ)与雷诺数(Re).点在模迪(L·F·Moody)图中分析:平直铺放微管在Re≤2320时,相关点拟合线在层流线以上;在2320<Re<25000时,即过渡流可归并为光滑紊流计算[1]。绕曲微管水头损失虽然大于平直铺放微管,且可不分流态,进而给出可满足不同设计条件的经验公式。 相似文献
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赵传扬 《拖拉机与农用运输车》2022,(1)
以用户需求驱动为导向,通过质量功能展开(Quality Function Deployment,QFD)方法,将用户需求转化为技术特征的目标值,提高产品开发设计的准确性,为企业提高用户满意度、赢得市场提供参考。 相似文献
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Harm Boesveld Llionel Simbarashe Zisengwe Saroj Yakami 《Irrigation and Drainage Systems》2011,25(4):323-333
Drip irrigation is widely recognized as potentially one of the most efficient irrigation methods. However, this efficiency is often not achieved because systems are not always well designed or maintained and many farmers lack the tools to assess the crop water requirements and to monitor the soil moisture conditions in the field. There is a vast amount of literature on irrigation scheduling but little literature takes scientific information the next step by preparing practical guidelines for smallholder farmers. There is a large and widening gap between the state of the art irrigation scheduling tools and current on-farm irrigation practices. Most farmers find current irrigation scheduling tools overwhelming and lack the means and skills to install and operate them. It is suggested that farmers need simple, cheap and more comprehensive support tools to achieve improved irrigation management at the farm level. Wageningen University and Research Centre (WUR) developed the Drip Planner Chart (DPC) to provide smallholder farmers with a simple tool to schedule drip irrigation to the crops?? needs. DPC is a manual disk calculator to calculate daily irrigation requirement. Farmers?? feedback was the basis for developing the DPC. Using DPC over a three-year period in Spain resulted in a 14 % water saving and improved irrigation timing. Trials at smallholder farmer fields in Nepal and Zambia showed DPC advice is more adapted to the changing demands of the crop over the different growth stages and responds to the farmer??s quest for practical drip scheduling advice. This paper presents the Drip Planner Chart and the scientific validation of the accuracy of the DPC. Experiments on farmers?? fields show water saving in Nepal and improved yield in Zambia. In both countries an improved scheduling over the growing seasons was found using DPC. 相似文献