共查询到20条相似文献，搜索用时 718 毫秒
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本文分析了常用工程机械液压系统维护不当而对其造成的危害,探讨了如何适当维护液压系统.就液压传动的工程机械而言,液压系统的正常运行是其良好技术状况的一个主要标志.合格的液压油是液压系统可靠运行的保障,正确的维护是液压系统可靠运行的根本.为此,本人根据工作实践,就一般作业环境中工程机械液压系统的维护作一粗略的探讨. 相似文献
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沈卫强 《湖州师范学院学报》2009,(Z1)
翻车机叶片泵损坏的原因,除了泵自身原因外,与液压系统中常用的的辅助装置如油箱、换热器等的使用也有关.文章分析了长电公司翻车机叶片泵损坏的原因,并提出了相应的改进措施. 相似文献
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《河北能源职业技术学院学报》2016,(2)
液压传动系统是工程机械重要系统之一,也是最容易出现故障的系统,本文结合实践分析了工程机械液压传动系统常见故障及故障原因,以期为故障的查找和排除提供参考。 相似文献
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就液压传动的工程机械而言,液压系统的正常运行是其良好技术状况的一个主要标志.合格的液压油是液压系统可靠运行的保障,正确的维护是液压系统可靠运行的根本.为此,本人根据工作实践,就一般作业环境中工程机械液压系统的维护作一粗略的探讨. 相似文献
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《浙江大学学报(A卷英文版)》2020,(5)
随着全球经济的飞速发展和工程机械全球保有量的持续上升,工程机械的节能问题变得越来越突出。液压系统是工程机械的关键子系统,因此提高其能源利用率是当前实现工程机械节能的重要手段之一。而在传统的阀控或泵控液压系统中,由于受阀件和液压泵的固有特性制约,系统可控性和节能性通常无法得到兼顾。泵阀协控系统将泵控系统的节能特性与阀控系统的高精度和高频率响应相结合,使其成为当前电液系统的一个研究热点。本文总结了泵阀协控电液系统节能技术的最新研究进展,并重点分析了不同类型工程机械的液压系统结构、电动液压系统的控制方法、新型液压混合能量再生系统以及关键部件。同时,从负载口独立控制技术、共压导轨技术(CPR)和混合动力源系统三个方面探讨了泵阀协控系统的未来发展方向和面临的挑战。 相似文献
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论述了工程机械液压系统的故障以及故障的诊断方法及步骤,通过实例剖析了排除液压系统故障的方法. 相似文献
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随着工程机械在施工中使用越来越频繁,施工机械中控制系统很多使用液压控制系统,因此对液压系统的维护及保养十分关键。液压泵是液压系统不可或缺的部件,因此对液压泵的使用及维修极为关键。 相似文献
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现代工程机械广泛采用液压、液力技术,对加强液压系统维护保养提出了更高要求。归纳了液压传动系统常见故障及排除措施,总结了液压传动系统故障诊断方法,从故障成因出发,提出液压系统维护与保养方法。 相似文献
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卢冬 《中国教育技术装备》2008,(10):87-88
针对工程机械系列产品中国产化程度最高的装载机,综合分析其液压系统等部件的状态概率数据,认为液压系统的可靠性是国产装载机的重要问题,有必要改进设计,并提出改进措施,将有利于改善液压系统工作的安全性和使用寿命。 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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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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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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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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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