EH系列智能型电液执行机构

EH系列由EHL直行程和EHR角行程两大系列组成，各系列均包括智能电子式，智能开关式及现场总线通讯等信号方式。EH系列智能电液执行机构是电力、冶金、化工、环保等重要场合较理想的产品之一。为了使智能电液执行机构降低成本，得到更广泛的推广，本公司不但开发步进电机和变频调速控制的高档式智能电液执行机构，而且重点开发出异步电机控制的通用式智能电液执行机构．使得EH系列智能型电液执行机构具有较好的性能价格比优势。     

英斯特朗 8500PLUS 全数字化控制电液伺服材料试验机

英斯特朗８５００ＰＬＵＳ全数字化控制电液伺服材料试验机英斯特朗公司近年在电液伺服疲劳试验机上率先采用了动态响应自适应控制技术，成功地研制了新型８５００ＰＬＵＳ系列全数字化控制电液伺服疲劳试验机，并已获得专利。该机使用了最先进的高速数字信号处理器对材料...     

变刚度振动控制在电信大楼抗震设计中的应用研究

本文结合某电信大楼结构实际工程，应用电液式变刚度结构振动控制系统，对其进行抗震控制的计算和技术经济分析，计算结果表明：在结构中采用电液式变刚度结构的控制系统，不仅结构的地震反应得到了有效的控制，而且还取得了明显的经济效益。     

先进技术装备的投用促进了采煤安全高效发展

2012年,东荣二矿不断加大设备更新和技术创新力度,投用新装备、新技术装备采煤工作面,加强三机配套,采用先进的生产工艺进行采煤生产作业,促进了采煤安全高效发展。东荣二矿两个综采队引进了先进的电液控支架,大功率采煤机,大功率工作面刮板运输机。电液控支架采用TSAC电液控系统。电液控支架可实现邻架操纵或远方控制;可进行一架控制多架动作进行成组支溜;可进行护帮成组收伸;可进行护帮和伸缩梁联动伸缩：可进行一架或多架成组实现自动移架全过程;在顶板压力发生变化时可进行立柱自动补压,大大提高了支架的初撑力。大大降低了工作劳动强度。     

电液控制技术在钻机设备的应用及发展前景展望

为了能充分扩大电液控制技术在钻机设备上的应用,突出电液控制的技术优势,使钻机设备的整体性能有飞跃式的提高,本文通过电液控制系统在石油钻机设备上五个部件的应用和改进,来介绍电液控制系统在钻机设备上的应用前景与实际情况。电液控制技术在钻机设备上的应用,一方面提高了钻机设备在控制方面的性能,同时也减少了钻机设备对人工的依赖程度;另外,电液控制系统的应用进一步的提高了钻机设备在运行时的安全系数,增加了运行时的可靠性。     

板簧轧机电液伺服控制系统的设计与实现

全自动液压板簧轧机是用于制造汽车板簧的专用设备。介绍了自主开发制造的全自动液压变截面板簧轧机的基本组成,分析了变截面板簧生产对设备运动的控制要求。轧机的电液伺服系统采用两级计算机控制方式,建立了电液伺服系统数学模型,分析了电液伺服系统的动态性能。经过应用验证了该设备生产率高、适用性强。     

电液四轴高频结构强度疲劳试验系统

电液激振器受传统的电液伺服阀频响特性的限制,其激振频率难以提高,采用2D阀替代传统伺服阀组成电液激振器的方案,该激振器通过增加阀芯的旋转速度来提高其激振频率,同时将该电液激振器应用于4轴高频结构试验系统。对试验系统的结构和工作原理进行了分析讨论,包括频率、幅值和相位的控制方法。基于系统的频响仿真分析,提出了4个作动器的同步控制策略,对理论分析进行实验验证。试验结果表明:该电液四轴强度疲劳试验系统能在40 Hz~200 Hz范围内对试验对象进行同步加载试验,其频率、幅值连续可控。     

WAW-Y500微机控制电液伺服万能试验机的应用

对引进WAW－Y500微机控制电液伺服万能试验机的结构原理、功能特点作了叙述。着重介绍了该机四种自动控制模式的正确选用、程序参数的优化选择方法和检测中的开发应用。     

电液伺服动态试验技术与电液伺服动态试验机

回顾了试验机的发展历史,尤其是电液伺服技术的发展以及电液伺服动态试验机的发展历程,分析了电液伺服控制系统以及电液伺服动态试验机的技术原理、系统的优缺点、试验机的组成及分类,为试验机的使用人员提供了参考。     

电液控制系统在2873w工作面的应用

pm32支架电液控制系统可用于各种型式液压支架的控制和操作。支架的型式、结构和控制要求不同,配套的pm32控制系统的配置和控制软件也随之变化。文章简要分析pm32电液控制系统的构成及其在2873w工作面的应用。     

The Research of Anti-Wear Properties of Organomolybdenum Compounds in the Engine Oils

A four-ball tester was used to evaluate the anti-wear performance of three kinds of organomolybdemun compounds in the engine oils, i. e., molybdenum dialkyldithiophosphate (MoDDP), molybdenum dialkyldithiocarbamate ( MoDTC), and sulphur and phosphorus freeorganomolybdeum (Molybdate). The results indicate that a low concentration of MoDDP doesn' t improve the anti-wear properties of the commercial engine oils, but a high concentration of MoDDP can obviously improve the anti-wear properties and the load-carrying capacity of the engine oils. MoDTC doesn' t improve the antiwear properties of the engine oils, but worsens the anti-wear properties of the oils. Signifi can timprove ment of frictional and wear characteristics is obtained with Molybdate added in the commercial engine oils and the formulated oils.     

Certification Becomes Important for the I Quality; and Safety Supervision of the Chinese Liquor Sector

The end of 2007, over 200 unit products of more than 80 Chinese firms have passed the quality grade certification for liquor products. These products involve distilled spirits, beer, wine, yellow wine, fruit syrup wine and others, and cover over 80% of the national top-branded liquor products.……     

Deposition and Coating Properties on CVD Tungsten

Surface characterization and microstructure studies are performed on chemical vapor deposited (CVD) tungsten coating. There is about 2 μm thickness diffusion layer of tungsten in the molybdenum substrate. The thermal shock test shows tungsten coating has good adhesion with molybdenum substrate, but the elements of oxygen and carbon in the tungsten coating have the bad affection to the adhesion. The result of high-temperature diffusion experiment is the diffusion rate from molybdenum substrate to tungsten coating is faster.     

Analysis of marine hydrobiont lipid extracts as possible cryoprotective agents

We studied a combined effect of the cryoprotectants both of lipid and carbohydrate origin at the presence of DMSO or without it on cell viability and the RNA synthesis in the embryonic mollusc and echinoderm cell cultures obtained at different developmental stages. Cryoprotective properties of exogenous lipids correlated with their thermotropic behavior. Lipid extracts from marine hydrobiontes, which thermal transitions are characterized by relatively small part of calorimetric thermogram area lying at temperatures above 0 °C (6–18%), were found to possess a considerable cryoprotective activity. The results are discussed in relation to the prediction of the cryoprotective activity of lipid extracts for marine animal cells. In addition, it was found that marine invertebrate cells can be cryopreserved without DMSO at the presence of trehalose and lipid extracts of some marine hydrobiontes.     

Low-Temperature Properties of Silver

Pure silver is used extensively in the preparation of high-temperature superconductor wires, tapes, films, and other configurations in which the silver not only shields the superconducting material from the surrounding materials, but also provides a degree of flexibility and strain relief, as well as stabilization and low-resistance electrical contact. Silver is relatively expensive, but at this stage of superconductor development, its unique combination of properties seems to offer the only reasonable means of achieving usable lengths of conductor. In this role, the low-temperature physical (electrical, thermal, magnetic, optical) and mechanical properties of the silver all become important. Here we present a collection of properties data extracted from the cryogenic literature and, to the extent possible, selected for reliability.     

Early ironwork in Biscay: Survey,excavation, experimentation and materials characterization. An integral study of the mountainside ironworks (ferrerías de monte or “haizeolak”)

ABSTRACT

The production of iron in Biscay (Basque Country, Spain) has been a hallmark of this territory of the North of the Iberian Peninsula throughout its history. The Archaeology team of the Basque Country Mining Museum has spent 13 years, so far, studying the origins of this activity through the evidences left at the old pre-hydraulic iron production workshops known as mountainside ironworks (ferrerías de monte) or haizeolak. It has catalogued 170 archaeometallurgical sites of this type in Biscay, and the archeological excavation of some of them has led to the knowledge of the different stages of the production process that took place in these workshops. The team has also experimentally reproduced the work carried out in a mountainside ironworks from the High Middle Ages, and it has currently started the characterization process of this type of activity through the study of the collected materials.     

Mechanism Study on the Wear of CrAlTiN Coated High-Speed Steel Twist Drills Under Dry Cutting Conditions

As demands about environment protection are growing up, dry cutting technology is getting more and more concerns from all over the world. Main works performed here are study on dry cutting performances and wear mechanisms of M2high-speed steel (HSS) twist drills with CrAlTiN multicomponent coatings, which was deposited using magnetron sputter ion plating system, in drilling 45 and 30CrMnSiA steel, and their comparisons to those in drilling the same steel but using monolayer CrN and commercial TiN coated drills. Drilling performances of drills are evaluated mainly through the measurements of width on outer corner flank land and the cutting forces. Results show that performances of CrAlTiN coated drills are better than those of monolayer CrN and TiN coated drills. In drilling 45 and 30CrMnSiA steel, the average tool life of the CrAlTiN coated drills are 17.2 and 11.8 times higher than those of the uncoated drills. Observing wear of the drill with scanning electronic microscope, results show that there is no crack or spallation of the CrAlTiN coatings in wear zones. Main mechanism of the wear here is adhesion.     

Study on Bond Ability of Arc-Spraying Coatings with Different Surface Pretreatment on Cast-Iron

Arc spraying coatings are widely used in various applications, but uncommon in cast iron substrate. Different surface pretreatment technology is tested on substrates of gray cast iron. Surface roughness and residual stress were measured by TR200 and X-ray diffraction analyzer. Influence of different surface pretreatment methods ( dry blasting and fusebond) on roughness and residual stress was analyzed. The arc-sprayed coatings of wire 3Cr13 (φ2mm) on gray cast iron substrate is studied. The microstructure and interface of bonding layer were observed by SEM. The bond strength was taken by tensile test. Results show that bond strength with grit blasting is higher than fuse-bond; it is feasible to make wire 3Cr13 coating with arc spraying on cast iron substrate roughened by grit blasting.     

Structural Characteristics of TiO2 Ceramic Coating by Micro-Plasma Oxidation

TiO2 ceramic coatings with thickness of 20 μm were formed on the surface of pure titanium by micro-plasma oxidation. Their micro-structures were investigated by by using X-ray diffraction and their surface images were detected by using scan electronic microscope. There were three kinds of TiO2 coatings, pure anatase type TiO2 phase, mixed phases consisted of rutile type TiO2 phase and anatase type TiO2 phase, pure rutile type TiO2 phase. The coating surface with the pure anatase type TiO2 phase is rough, while the coating surface with the pure rutile type TiO2phase is smooth. The upper coating surface with the mixed type TiO2 phases is anatase type TiO2 structure and the subsurface of the TiO2 coating is rutile type TiO2structure.     

Evaluation of fatigue life of steel using steel grain size

The insightful discussion of the relationship between the construction of metallographic and fatigue life and proposition of mathematical relationships describing this relationship was conducted in the paper. This paper presents a method for estimating the fatigue life, based on the construction of the microstructural material taking into account the grain size and the participation of ferrite and pearlite phase.