共查询到19条相似文献,搜索用时 328 毫秒
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本文介绍一种气动程序控制回路的逻辑设计方法。气功控制回路设计的关键是根据执行元件的动作要求准确地确定控制信号元件与操纵元件之间的关系。本方法是利用控制信号元件的信号状态式进行逻辑运算来确定控制信号元件与操纵元件之间的关系,再根据控制信号元件与操纵元件之间的逻辑关系式设计气动回路。这种逻辑设计方法简便易懂,适用于各种控制方式(如气动、电气等)的气动传动回路的设计。 相似文献
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张世珍 《金刚石与磨料磨具工程》1979,(1)
为顺利完成工艺过程自动化的任务,就要用工作性能可靠的快速检测仪表和装置来装备工业企业,以检查磨料磨具的基本工艺和商品性能。在最近7—10年内计划设计和制造一系列新的或改进的电子仪表,其中主要的有:速动声测硬度计(用于检查直径大于160毫米砂轮的硬度)、自动多工位硬度计(检查油石的硬 相似文献
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气压传动技术的发展和液压传动技术的发展过程相类似,随着工业生产机械化和自动化程度的日益提高,也由最初的管式元件向板式元件、由单体元件向组合元件、由简单系统向复杂和多功能系统发展。气动系统中元件的组合方法很多。目前在机械设备上广泛使用的是将管式元件利用导管 相似文献
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张或定 《组合机床与自动化加工技术》1979,(6)
随着液压元件性能的日益提高,液压技术在各个领域内得到越来越广泛的应用。 近年来对液压元件在高效率和小型化方面提出了更高的要求,因此使液压元件又进一步向更加高压和高速的方向发展。由此引起液压元件的噪声有所增加,所以最近国外在降低液压元件的噪声方面进行了各种研究和改进,使液压元件的噪声有了明显下降,许多低噪声液压元件相继出现。因此,通过各种措施降低液压马达的噪声,也是当前液压泵和液压马达发 相似文献
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周书若 《稀有金属材料与工程》1986,(2)
PCI是水冷动力反应堆燃料元件使用性能的重要限制因素之一。所谓燃料元件的PCI(Pellet and Cladding Interaction)是指水冷动力反应堆所使用的燃料元件中芯块与包壳相互作用情况,它可导致元件破 相似文献
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LUO Laizhong ZHANG Jinxiu LIN Guangming Zhongshan University Guangzhou China Lecturer Dept.of Physics Institute of Material Science Zhongshan University Guangzhou China 《金属学报(英文版)》1989,2(5):380-382
The snap-action behavior of a Ni-Ti alloy disc which is controlled by combination of anonlinear stress field and temperature has been studied.After treatment for two-way shapememory,all shape memory strain of snap-action finishes abruptly at a certain temperaturewithin an interval of less than 1 ms.The results of resistance measurement and in-situ X-raydiffraction indicate that the snap-action strain is mainly resulted from the snap-action β R transformation. 相似文献
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LIN Guangming CHENXingyuan ZHANG Jinxiu Material Science Research Institute Zhongshan University Guangzhou China WANG Yurui Metallurgy Research Institute of Beijing Iron Steel Company Beijing China LIN Guangming Associate Professor Department of Physics Zhongshan University Guangzhou China 《金属学报(英文版)》1990,3(2):142-144
Snap-acting two way shape memory device can be obtained by using the design proposed byauthors.Some essential parameters which characterize the properties of device have been pro-posed also in this paper.And the principle and method according to which a practicalsnap-acting device can be designed have been described. 相似文献
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In shape memory materials,that have been trained to have a two way shape memory effect(TWSM),themartensitic variants are classified into two groups,i.e.,preferentially oriented variants and self-accommodatingvariants.Applied stress may promote or constrain the transition of preferentially oriented variants and so changetransformation temperatures but has no essential effect on self-accommodating variants.According to the pointof view mentioned above,some experimental phenomena during thermocycling of a TWSM device may be ex-plained,such as the absence of synchronization between the plot of resistance change.temperature and the plotof memory strain vs.temperature. 相似文献
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近等原子比NiTi形状记忆合金的超弹性 总被引:13,自引:3,他引:13
研究了冷拔量、热处理工艺参数对Ti49.8%Ni合金丝材的超弹性的影响。结果表明不同冷拔量、不同退火工艺处理的丝材获得完全超弹性的温度区间、超弹性特性都不相同,获得最大超弹性应变量的处理工艺为冷拔量39%、退火温度723K、保温时间30min。 相似文献
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The variations of the shape memory effects in the Cu-13Zn-15Al(mole fraction, %) alloy upon successive heating (the rate of heating is 5℃/min) have been studied by means of ρ-T curve , shape memory effect measurement, optical metallographical observation and X-ray diffraction. The first abnormal reverse shape memory effect occurs when the tested alloy is heated to the temperature below 320℃ ; when it is heated to the temperature between 320℃ and 450℃, the forward shape memory effect occurs; in the two stages, the shape of the sample remains the same as that in the furnace when it is taken out from the furnace and air-cooled; when the tested alloy is heated to the temperature above 450℃, the shape of the sample remains unchanged during heating, but the second reverse shape memory effect occurs after it is air-quenched. 相似文献
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FeMnSi形状记忆合金管接头的研制 总被引:4,自引:0,他引:4
以开发实用FeMnSi形状记忆合金管接头为目的,主要研究了管接头的成型性,处理制度、耐蚀性能和密封性能。结果表明:FeMnSi合金耐蚀性能差,合金中Si含量严重影响接头成型性,经最佳热处理,管接头的形状恢复率达到55%,接管的耐压达32MPa,适用于低压管路连接。要扩大其应用范围,需提高合金的耐蚀性能和接头的形状恢复率。 相似文献
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S.K.Wu 《金属学报(英文版)》1995,(Z1)
Shape-MemoryIntermetallicsDevelopmentinTaiwanS.K.Wu(InstituteofMaterialsScienceandEngineering,NationalTaiwanUniversityTaipei,... 相似文献