煤矿机械电气控制系统设计研究

煤炭能源占据我国能源结构的首位,煤矿机械是煤炭资源生产的关键性设备。基于此,文章根据煤矿机械电气控制系统的设计需求,提出了煤矿机械电气控制系统的设计总体方案,并对煤矿机械电气控制系统的软硬件设计进行了进一步探究,希望为煤矿机械电气控制系统的设计提供一些参考。     

继电器控制系统在工业生产中的应用

电气控制技术是以各类电动机为动力的传动装置或者系统为对象,以实现生产技术的精密化、生产设备的信息化、生产过程的自动化及机电控制系统的最佳化的一门技术。在电气控制技术中,其控制系统是主要的组成部分。如今机械的电气控制系统是生产机械中不可缺少的组成部分,它对生产机械能否正确可靠地工作起着决定的作用。本文主要介绍可编程序控制系统电器控制技术的应用。     

远程检测与控制系统在电气液压设备中的应用

阐述远程监控与控制系统的原理和组成,探讨系统在机械电气液压设备中的应用,包括故障诊断、维修保养、生产管理。展望机械电气液压设备的发展趋势。     

电气自动化控制中的PLC的有效应用

电气自动化控制的过程中融入PLC技术对电气自动化发展是非常关键的。借助PLC技术的基本原理,将该技术融入到自动化控制当中,有助于解决控制系统中存在的缺陷,提升机械自动化的水平,为工业的发展和产品质量的提升奠定良好基础。文章结合自身经验和认识,结合PLC技术的基本内容,对PLC在电气自动化中的应用做简要分析。     

浅析基于PLC的数控机床电气控制系统的设计

本文将数控机床的电气控制系统的相关内容开始,继而提出基于PLC的数控机床电气控制系统的设计方法,最后得以结语。     

PLC在典型生产机械电气控制系统中的应用

随着行业发展形势的不断严峻,企业在应对激烈市场竞争的过程中不断探究提高生产效率的方式方法,自动化技术的发展革新了各行各业的生产方式,机械电气面对着技术的发展与时代的变迁,也将发展的视角放在了自动化技术与机械电气的融合上.技术的更新为自动化生产提高了技术的基础,机械电气控制系统在应用的过程中通过与PLC技术的融合,以技术...     

X62W铣床PLC系统改造

X62W77能铣床是一种高效率的加工机械,在机械加工和机械修理中得到广泛的应用．万能铣床的操作是通过机械手柄N时操作电气与机械,已达到机电紧密配合完成预定的操作．是机械与电气结构联合动作的典型控制,是自动化程度较高的组合机床。继电器接触式控制系统,由于电气控制线路触点多、线路复杂、故障率高、检修周期长,给生产与维护带来诸多不便。将X62W万能铣床电气控制线路改造为可编程控制器控制,既可以提高整个电气控制系统的工作性能．又减少维护、维修的工作量。PLC控制系统无论是硬件还是软件,控制稳定可靠,具有极高的可靠性与灵活性。     

X62W铣床PLC系统改造

X62W万能铣床是一种高效率的加工机械,在机械加工和机械修理中得到广泛的应用,万能铣床的操作是通过机械手柄同时操作电气与机械,已达到机电紧密配合完成预定的操作,是机械与电气结构联合动作的典型控制,是自动化程度较高的组合机床。继电器接触式控制系统,由于电气控制线路触点多、线路复杂、故障率高、检修周期长,给生产与维护带来诸多不便。将X62W万能铣床电气控制线路改造为可编程控制器控制,既可以提高整个电气控制系统的工作性能,又减少维护、维修的工作量。PLC控制系统无论是硬件还是软件,控制稳定可靠,具有极高的可靠性与灵活性。     

蒸铝加热线圈自动绕制机的研制

详细介绍了自动绕制钨丝线圈专用设备的研制过程及其机械结构、系统功能、工艺流程、电气控制系统和软件设计等关键技术     

车床电气常见故障分析与处理

电力拖动控制系统是由各种电气元件组成的,使用 最广泛和最基本的控制电器是由各种有触点的电器, 如接触器、按钮等。虽然现代电力拖动控制系统应用了 单片机、PLC,但继电器——接触控制仍不失为一种基 本的控制方法。 车床是由机械和电气两大部分组成,其任一部分     

Resolution Enhancement Technology:Integrated Process Solutions using OPC

DUV lithography, using the 248 nm wavelength, is a viable manufacturing option for devices with features at 130 nm and less. Given the low kl value of the lithography, integrated process development is a necessary method for achieving acceptable process latitude. The application of assist features for rule based OPC requires the simultaneous optimization of the mask, illumination optics and the resist.Described in this paper are the details involved in optimizing each of these aspects for line and space imaging.A reference pitch is first chosen to determine how the optics will be set. The ideal sigma setting is determined by a simple geometrically derived expression. The inner and outer machine settings are determined, in turn,with the simulation of a figure of merit. The maximum value of the response surface of this FOM occurs at the optimal sigma settings. Experimental confirmation of this is shown in the paper.Assist features are used to modify the aerial image of the more isolated images on the mask. The effect that the diffraction of the scattering bars (SBs) has on the image intensity distribution is explained. Rules for determining the size and placement of SBs are also given.Resist is optimized for use with off-axis illumination and assist features. A general explanation of the material' s effect is discussed along with the affect on the through-pitch bias. The paper culminates with the showing of the lithographic results from the fully optimized system.     

Cost-effective test solutions for smart card and other integrated flash applications

From its emergence in the late 1980s as a lower cost alternative to early EEPROM technologies, flash memory has evolved to higher densities and speedsand rapidly growing acceptance in mobile applications.In the process, flash memory devices have placed increased test requirements on manufacturers. Today, as flash device test grows in importance in China, manufacturers face growing pressure for reduced cost-oftest, increased throughput and greater return on investment for test equipment. At the same time, the move to integrated flash packages for contactless smart card applications adds a significant further challenge to manufacturers seeking rapid, low-cost test.     

Theoretical analysis of the relationship between the Brillouin gain coefficient and the strain in the optical-fiber sensors

The relation between the power of the Brillouin signal and the strain is one of the bases of the distributed fiber sensors of temperature and strain. The coefficient of the Bfillouin gain can be changed by the temperature and the strain that will affect the power of the Brillouin scattering. The relation between the change of the Brillouin gain coefficient and the strain is thought to be linear by many researchers. However, it is not always linear based on the theoretical analysis and numerical simulation. Therefore, errors will be caused if the relation between the change of the Brillouin gain coefficient and the strain is regarded as to be linear approximately for measuring the temperature and the strain. For this reason, the influence of the parameters on the Brillouin gain coefficient is proposed through theoretical analysis and numerical simulation.     

An improved parallel thinning algorithm with two subiterations

The parallel thinning algorithm with two subiterations is improved in this paper. By analyzing the notions of connected components and passes, a conclusion is drawn that the number of passes and the number of eight-connected components are equal. Then the expression of the number of eight-connected components is obtained which replaces the old one in the algorithm. And a reserving condition is proposed by experiments, which alleviates the excess deletion where a diagonal line and a beeline intersect. The experimental results demonstrate that the thinned curve is almost located in the middle of the original curve connectivelv with single pixel width and the processing speed is high.     

Novel fiber-optical interferometer with miniaturized probe for in-hole measurements

Today, micro-system technology and the development of new MEMS （Micro-Electro-Mechanical Systems） are emerging rapidly. In order for this development to become a success in the long run, measurement systems have to ensure product quality. Most often, MEMS have to be tested by means of functionality or destructive tests. One reason for this is that there are no suitable systems or sensing probes available which can be used for the measurement of quasi inaccessible features like small holes or cavities. We present a measurement system that could be used for these kinds of measurements. The system combines a fiber optical, miniaturized sensing probe with low-coherence interferometry, so that absolute distance measurements with nanometer accuracy are possible.     

Development of the readout system for waveguide multilayer optical card

Waveguide multilayer optical card （WMOC） is a novel storage device of three-dimensional optical information. An advanced readout system fitting for the WMOC is introduced in this paper. The hardware mainly consists of the light source for reading, WMOC, motorized stages addressing unit, microscope imaging unit, CCD detecting unit and PC controlling ＆ processing unit. The movement of the precision motorized stage is controlled by the computer through Visual Basic （VB） language in software. A control panel is also designed to get the layer address and the page address through which the position of the motorized stages can be changed. The WMOC readout system is easy to manage and the readout result is directly displayed on computer monitor.     

Study of waveguide coupling efficiency in hybrid silicon lasers

This paper presents a new method to increase the waveguide coupling efficiency in hybrid silicon lasers. We find that the propagation constant of the InGaAsP emitting layer can be equal to that of the Si resonant layer through improving the design size of the InP waveguide. The coupling power achieves 42% of the total power in the hybrid lasers when the thickness of the bonding layer is 100 nm. Our result is very close to 50% of the total power reported by Intel when the thickness of the thin bonding layer is less than 5 nm. Therefore, our invariable coupling power technique is simpler than Intel＇s.     

Collinear phase-matching study of terahertz-wave generation via difference frequency mixed in GaAs and Inp

The collinearly phase-matching condition of terahertz-wave generation via difference frequency mixed in GaAs and InP is theoretically studied. In collinear phase-matching, the optimum phase-matching wave hands of these two crystals are calculated. The optimum phase-matching wave bands in GaAs and lnP are 0.95-1.38μm and 0.7-0.96μm respectively. The influence of the wavelength choice of the pump wave on the coherent length in THz-wave tuning is also discussed. The influence of the temperature alteration on the phase-matching and the temperature tuning properties in GaAs crystal are calculated and analyzed. It can serve for the following experiments as a theoretical evidence and a reference as well.     

Effects of the alloy compositions on the phonon-polaritons in ternary mixed crystals

Composition dependence of bulk and surface phonon-polaritons in ternary mixed crystals are studied in the framework of the modified random-element-isodisplacement model and the Bom-Huang approximation. The numerical results for Several Ⅱ - Ⅵ and Ⅲ- Ⅴ compound systems are performed, and the polariton frequencies as functions of the compositions for ternary mixed crystals AlxGa1-xAs, GaPxAS1-x, ZnSxSe1-x, GaAsxSb1-x, GaxIn1-xP, and ZnxCd1-xS as examples are given and discussed. The results show that the dependence of the energies of two branches of bulk phonon-polaritons which have phonon-like characteristics, and surface phonon-polaritons on the compositions of ternary mixed crystals are nonlinear and different from those of the corresponding binary systems.     

New insert layer structure OLEDs

An insert layer structure organic electroluminescent device（OLED） based on a new luminescent material （Zn（salen）） is fabricated. The configuration of the device is ITO/CuPc/NPD/Zn（salen）/Liq/LiF/A1/CuPc/NPD/Zn（salen）/Liq/LiF/A1. Effective insert electrode layers comprising LiF（1nm）/Al（5 nm） are used as a single semitransparent mirror, and bilayer cathode LiF（1 nm）/A1（100 nm） is used as a reflecting mirror. The two mirrors form a Fabry-Perot microcavity and two emissive units. The maximum brightness and luminous efficiency reach 674 cd/m^2 and 2.652 cd/A, respectively, which are 2.1 and 3.7 times higher than the conventional device, respectively. The superior brightness and luminous efficiency over conventional single-unit devices are attributed to microcavity effect.