共查询到20条相似文献，搜索用时 46 毫秒
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通过时液动冲击器与液压凿岩机的比较，提出了两点看法：（１）液压凿岩机的大液压小流量及高的能量利用系数，对液动冲击器的研制有借鉴作用；（２）水的液体弹簧性质对提高液动冲击器的工作性能具有重要作用。 相似文献
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增大液动射流式冲击器单次冲击功的试验研究 总被引：3，自引：0，他引：3
:试验结果发现 ,当行程加大时 ,获得较高的冲锤末速度 (5 .43m/s) ,单次冲击功 34 6 .45J。当活塞运动所需瞬时流量已大大超过了水泵供水的供给量时 ,冲击器仍能稳定地工作 ,这体现了射流冲击器作为一开放的系统所特有的流量可自动补偿的优点。射流冲击器对负载的适应能力较高 ,且在大行程条件下 ,增加锤重可较大幅度地提高单次冲击功。 相似文献
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液动冲击器的阀程，反映了冲频的高低及冲击功的大小，它必定对时效产生重要影响。但长期以来，人们对此重视不够，致使冲击器的使用效果有时不佳。为弄清阀程对时效的影响，以及阀程和钻进参数的影响，在花岗岩地层进行了对比试验，试验结果表明，阀程对时效的影响不可忽视。试验情况如下。 相似文献
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本文详细介绍了用应力波法测试液动冲击器性能参数的微机系统。该系统根据国际标准设计,具有方法先进,设备简单,采样速度快及计算准确等特点。使用该系统,可以很方便地测量冲击器的能量、频率、流量等重要指标。它提供了研究和改进液动冲击器的有效方法,进一步研究将会得知不同冲击器破碎岩石所需的能量。该系统首次在地质系统应用。 相似文献
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射流元件损坏机理试验研究及分析 总被引：13，自引：0，他引：13
液动射流式冲击器在高压釜内进行模拟试验时发现其工作性能良好，展现了其良好的应用前景。而在石油钻井、大陆科学深钻等深孔钻进中应用液动射流式冲击器发现，射流元件寿命较低。故有必要对其破坏机理进行研究。在实验中采用对比的方法，发现在大泵量情况下射流元件工作室内出现水射流反射及脉冲现象。射流元件破坏主要由脉冲AWJ切割所造成。液动射流式冲击器用于深孔钻进时射流元件有必要对元件尺寸进行改进。 相似文献
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分析了双作用液动贯通式冲击器闭阀加速运动、自由行程和回程各阶段的受力情况，建立了相应的仿真电算数学模型。 相似文献
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液动冲击器是铀矿科学深钻采用的关键技术,采用固定射吸单元结构的液动冲击器可降低启动流量,稳定冲击频率。为探究固定射吸单元结构对冲锤抬升的作用机理,采用FLUENT软件对冲锤射吸结构流场进行了模拟仿真,分析了喷嘴射流长度和冲锤下腔压强变化,优选了射流卷吸结构参数。结果表明:冲锤射吸结构可提高冲锤上下腔压强差,降低冲击器的启动工作流量;喷嘴结构影响有效射流长度,建议喷嘴出口圆柱长度取值范围为5～10 mm,喷嘴收敛角取值范围为22°～23°,收敛段长度范围为40～60 mm;承喷距离和承喷喉管的增大,均可造成冲锤下腔压强减小,建议当喷嘴直径为10 mm时,承喷距离在12～14 mm之间,承喷喉管直径在16～17 mm为宜。分析结果可为优化绳索取心液动冲击器性能和改进结构设计提供参考。 相似文献
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Inter-regional correlation of transgressions and regressions in the Cretaceous period 总被引：1，自引：0，他引：1
T. Matsumoto 《Cretaceous Research》1980,1(4):359-373
Well investigated platforms have been selected in each continent, and the history of Cretaceous transgressions and regressions there is concisely reviewed from the available evidence. The factual records have been summarized into a diagram and the timing of the events correlated between distant as well as adjoining areas.On a global scale, major transgressions were stepwise enlarged in space and time from the Neocomian, via Aptian-Albian, to the Late Cretaceous, and the post-Cretaceous regression was very remarkable. Minor cycles of transgression-regression were not always synchronous between different areas. Some of them were, however, nearly synchronous between the areas facing the same ocean.Tectono-eustasy may have been the main cause of the phenomena of transgression-regression, but certain kinds of other tectonic movements which affected even the so-called stable platforms were also responsible for the phenomena. The combined effects of various causes may have been unusual in the Cretaceous, since it was a period of global tectonic activity. The slowing down of this activity followed by readjustments may have been the cause of the global regression at the end of the Cretaceous. 相似文献
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The Afyon stratovolcano exhibits lamprophyric rocks, emplaced as hydrovolcanic products, aphanitic lava flows and dyke intrusions, during the final stages of volcanic activity. Most of the Afyon volcanics belong to the silica-saturated alkaline suite, as potassic trachyandesites and trachytes, while the products of the latest activity are lamproitic lamprophyres (jumillite, orendite, verite, fitztroyite) and alkaline lamprophyres (campto-sannaite, sannaite, hyalo-monchiquite, analcime–monchiquite). Afyon lamprophyres exhibit LILE and Zr enrichments, related to mantle metasomatism. 相似文献
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正20140751 Guo Xincheng(Geological Party,BGMRED of Xinjiang,Changji 831100,China);Zheng Yuzhuang Determination and Geological Significance of the Mesoarchean Craton in Western Kunlun Mountains,Xinjiang,China(Geological Review,ISSN0371-5736,CN11-1952/P,59(3),2013,p.401-412,8 相似文献
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正20141058 Chen Ling(Key Laboratory of Mathematical Geology of Sichuan Province,Chengdu University of Technology,Chengdu610059,China);Guo Ke Study of Geochemical Ore-Forming Anomaly Identification Based on the Theory of Blind Source Separation(Geosci- 相似文献
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正20141334 Chen Kun(Institute of Geophysics,China Earthquake Administration,Beijing100081,China);Yu Yanxiang Shakemap of Peak Ground Acceleration with Bias Correction for the Lushan,Sichuan Earthquake on April20,2013(Seismology and Geology,ISSN0253-4967,CN11-2192/P,35(3),2013,p.627-633,2 illus.,1 table,9 refs.)Key words:great earthquakes,Sichuan Province 相似文献
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正20141624 Cai Xiongfei(Key Laboratory of Geobiology and Environmental Geology,Ministry of Education,China University of Geosciences,Wuhan 430074,China);Yang Jie A Restudy of the Upper Sinian Zhengmuguan and Tuerkeng Formations in the Helan Mountains(Journal of Stratigraphy,ISSN0253-4959CN32-1187/P,37(3),2013,p.377-386,5 illus.,2 tables,10 refs.) 相似文献
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正20142263Lü Shaojun(Geological Survey of Jiangxi Province,Nanchang 330030,China)Early-Middle Permian Biostratigraphical Characteristics in Qiangduo Area,Tibet(Resources SurveyEnvironment,ISSN1671-4814,CN32-1640/N,34(4),2013,p.221-227,2illus.,2tables,22refs.)Key words:biostratigraphy,Lower Permian,Middle Permian,Tibet 相似文献
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正20142560Hu Hongxia(Regional Geological and Mineral Resources Survey of Jilin Province,Changchun 130022,China);Dai Lixia Application of GIS Map Projection Transformation in Geological Work(Jilin Geology,ISSN1001-2427,CN22-1099/P,32(4),2013,p.160-163,4illus.,2refs.) 相似文献
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正20140692 Duo Tianhui(No.402 Geological Team,Exploration of Geology and Mineral Resources of Sichuan Authority,Chengdu611730,China);Wang Yongli Computer Simulation of Neptunium Existing Forms in the Groundwater(Computing Techniques for Geophysical and Geochemical Exploration,ISSN1001-1749,CN51-1242/P,35(3), 相似文献
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正20140876 Gao Junbo(College of Resources and Environmental Engineering,Guizhou University,Guiyang 550025,China);Yang Ruidong Study on the Strontium Isotopic Composition of Large Devonian Barite Deposits from Zhenning,Guizhou Province(Geochimica, 相似文献