共查询到20条相似文献，搜索用时 78 毫秒
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为了加强三菱PLC和艾默生变频器在工业洗衣机调速系统中的应用,设计了PLC控制系统硬件电路及控制程序,通过变频器内置PLC功能实现洗衣机的洗涤时间及洗涤频率的控制,给出变频器具体的参数设置。实践运行表明,该控制系统设计合理、运行可靠、提高了工业洗衣机的自动化水平,减少了机械传动机构,节省了能源。 相似文献
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王鋆 《湖州师范学院学报》2005,27(2):111-113
智能仪表在自动化生产领域里有着广泛的应用.智能仪表设计平台实现了一个开放的、可满足不同开发者需求的设计环境,从而提高了开发效率,实现可重用性. 相似文献
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提出基于西门子S7-200系列PLC和WinCC软件在水槽装置实验室构建计算机控制系统的思路,使水槽装置实验室改变了用研华采集板采集数据的传统试验模式。介绍水槽装置的运行原理,阐述了S7-200PLC和WinCC软件在水槽装置上设计计算机控制系统的过程。实验证明,西门子S7-200系列PLC和WinCC软件能很好地实现对水槽装置的控制,是学生学习并掌握PLC应用技术的良好平台。 相似文献
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对基于PLC的变频调速系统进行了设计和分析,首先分析了变频调速的基本原理和工作过程,在此基础上重点设计了基于PLC构成的变频调速控制系统,给出了详细的控制系统结构设计方案,并完成了变频器和PLC的选型设计与硬件接线设计,分析了控制系统实现无级调速的基本工作原理与过程,对于进一步提高PLC自动化控制技术在工厂自动化控制中的应用具有一定借鉴意义。 相似文献
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《实验室研究与探索》2017,(1)
针对高校实践教学要求并结合自动化类专业的特点,开发设计了一种模拟生产实际的自动化立体仓库实训装置。详细地介绍了装置的总体结构、硬件设计、下位机程序设计和上位机监控组态设计。本装置采用西门子S7-300PLC作为控制系统,并用WinCC组态软件开发了监控系统,实现了自动化立体仓库实训装置的就地手动控制、远程手动控制和远程自动控制等操作模式。在实际学生实训中,该装置实现了自动化生产实践教学内容的形象化,拉近了课堂与生产实践的距离,为培养学生实践动手能力、分析解决问题的能力提供了一个很好的实践平台。 相似文献
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机电气一体化系统的智能化、柔性化和自动化是自控领域研究的重点。平面仓储机械结构由料仓、分拣线、机械手、定位入库装置和仓库构成。结合气压传动、PLC控制,构成了典型的机电气一体化系统。该系统在分析平面仓储机械结构的基础上,对气压传动、PLC控制系统进行了详细的设计,将气压传动的优点、PLC强大的控制功能和触摸屏的人机交互、实时监控优势运用在一起。实践结果表明,该系统智能、灵活、稳定、可靠。 相似文献
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文章首先分析了自动化仓库的总体设计方案,并具体分析了该系统的硬件系统组成及软件设计的思想。采用PLC控制、利用光电检测、步进驱动等先进技术实现了自动化立体仓库模型的进出料控制和巷道机的精确定位。最后对自动化立体仓库控制的组态设计做了分析说明,实现了对自动化仓库模型的仿真控制和动态监控功能。 相似文献
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《兰州石化职业技术学院学报》2016,(3)
以电解铝炭素生阳极生产系统为背景,综合运用OPC技术和工业以太网,对如DCS、FCS、PLC和智能仪表等异构网络在网络级与接口级上的同构化集成问题上进行研究。通过PLC硬件与OPCServer组态,实现监控中心与下位PLC系统的通信;整个网络采用分散控制、集中管理的布置方式,最大程度满足工艺生产和用户需求。该系统支持开放和通用的以太网、TCP/IP和相关的技术,使自动化系统易于与MES和ERP系统无缝连接。经过实际测试和运行,网络系统构成灵活、数据读取实时性好,可靠性强,便于系统升级和扩展。 相似文献
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应用PLC作为主控制机,以触摸屏为人机操作界面,并显示和设置相关信息、参数。实现了自动化检测产品的相关参数,极大地提高了产品的检测效率和生产能力,降低了劳动强度,同时对继电器自动化生产线中难度较大的步进电机驱动和机械手的定位设计也作了阐述。 相似文献
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罗艳萍 《读与写:教育教学刊》2008,5(6)
The communication of people partially is the communication of cultures. Culture has a direct effect on international commercial activities in all aspects. Different conceptions about time, space, equality, law and the like, lead people to deal with things in different ways. So to know cultures of the counterpart is to facil-itate our enterprises so as to have a smooth and successful communication in commercial activity. 相似文献
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Richard Denner 《海外英语》2007,(4):14-15
Rosco and I wait for the fishermen to return.I sit at a wooden bench near the store at Mt.Baker Resort and watch the clouds change shape. Rosco has my belt around his neck and an eight foot tow chain hooked to a tree. Dogs must be on a leash. Ducks and rabbits are loose. 相似文献
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Given a graph G,a subgraph C is called a clique of G if C is a complete subgraph of G maximal under inclusion and |C|≥2. A clique-transversal set S of G is a set of vertices of G such that S meets all cliques of G. The clique-transversal number, denoted as TC (G), is the minimum cardinality of a clique-transversal set in G. The clique-graph of G, denoted as K (G), is the graph obtained by taking the cliques of G as vertices, and two vertices are adjacent if and only if the corresponding cliques in G have nonempty intersection. Let F be a class of graphs G such that F={G|K(G) is a tree}. In this paper the graphs in F having independent clique-transversal sets are shown and thus TC (G)/|G|≤1/2 for all G ∈ F. 相似文献
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《海外英语》2007,(5):10-11
Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help? 相似文献
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陈美曦 《山东教育学院学报》2008,23(2):103-107
Different nations have different social cultures, and the social culture of every nation is developing with the development of the nation, language is greatly influenced by social culture, which enables language to possess national and historical characteristics. Word is the smallest, independent, meaningful linguistic unit of language. It can well reflect the national and historical characteristics. From synchronic aspect, the social and cultural influence on word meaning is mainly embodied in conceptual and associative meanings of word. The incorrespondence of word meaning is a phenomenon that exists in both conceptual and associative meanings of word among different languages. From diachronic aspect, the development of social culture causes some changes of word meaning to some extent. Therefore, social culture plays a key role in vocabulary learning and mastery of a language. 相似文献
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邱崇丙 《唐山师范学院学报》2014,(1):21-23
汉字的六书,《说文》对“转注”一类,语焉不详。后世学者提及转注,也仅限于许慎所举出的例字。《汉字例说》一文,作者从转注的角度综合考虑,对部分现代常用字作了分析,跟传统的解释有所不同。希望能抛砖引玉,互相切磋,以推进学术研究。 相似文献
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《海外英语》2007,(4):36
There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love. 相似文献