共查询到20条相似文献，搜索用时 484 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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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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Rachel Zupek 《海外英语》2007,(11):40-41
我们绝大部分人都同意一件事情——我们喜欢金钱。但是你对金钱的喜欢之情足够到让你创立一份事业么?.财富通常被人忽视,主要在于人们不能真正了 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
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YANGShiguo 《重庆大学学报(英文版)》2004,3(1):86-88
The problem on the geometrc inequalities involving an n-dimensional simplex and its inscribed simplex is studied. Aninequality is established, which reveals that the difference between the squared circumradius of the n-dimensional simplex andthe squared distance between its circumcenter and barycenter times the squared circumradius of its inscribed simplex is not lessthan the 2(n-1)th power of n times its squared inradius, and is equal to when the simplex is regular and its inscribed siplex is atangent point one. Deduction from this inequality reaches a generalization of n-dimensional Euler inequality indicating that thecircumradius of the simplex is not less than the n-fold inradius. Another inequality is derived to present the relationship betweenthe circumradius of the n-dimensional simplex and the circumradius and inradius of its pedal simplex. 相似文献
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Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject. 相似文献
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GUO Bao-feng Xiao Da-wei 《重庆大学学报(英文版)》2005,4(3):129-133
Using virtual reality for interactive design gives a designer an intuitive vision of a design and allows the designer to achieve a viable, optimal solution in a timely manner. The article discusses the process of making the Virtual Reality System of the Humble Administrator＇s Garden. Translating building data to the Virtual Reality Modeling Language （VRML） is by far unsatisfactory. This creates a challenge for computer designers to do optimization to meet requirements. Five different approaches to optimize models have been presented in this paper. The other methods are to optimize VRML and to reduce the file size. This is done by keeping polygon counts to a minimum and by applying such techniques as object culling and level-ofdetail switching. 相似文献
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The awareness of individualism can be traced back to the period of American Revolution when the Declaration of Independence was produced.It expressed basic beliefs concerning freedom,equality,democracy,privacy and the relationship between people and government,which were exactly what the philosophy of individualism mostly dealt with at that time.This paper is to exploit the essence of individualism by analyzing the Declaration .The analysis enables us to reconsider its significance to the issue of America human rights and foreign policies. 相似文献
20.
Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities. 相似文献