筒子纱包装自动撑口套袋系统的设计与实现

目的 为提高包装效率,根据纺织企业筒子纱编织袋包装工艺要求,设计并实现西门子PLC S7-1200作为控制器的筒子纱编织袋包装自动撑口套袋系统.方法 在系统的机械结构设计方面,设计撵袋吸运子系统和自动撑口套袋子系统,子系统由若干机械装置组成;在控制系统方面,对控制系统的硬件和软件进行设计,由可编程逻辑控制器PLC进行整体控制,通过驱动直流电机、气缸电磁阀及真空发生器等执行元件实现动作,并由西门子触摸屏进行组态,实现生产过程的监控和手自动模式切换.结果 样机稳定性测试,每组100次,进行10组,结果表明运行相对稳定,成功率达到了99.3％.结论 该系统整体运行稳定,包装效率较人工得到了较大提高.     

静电悬浮加速度计气体阻尼及其对控制系统特性影响分析

在分子流状态下,将余弦定律应用于静电悬浮加速度计荷载气体阻尼力分析中,推导出了静电悬浮加速度计中气体阻尼系数的计算公式.通过该公式,可以方便地进行静电悬浮加速度计控制系统动态和静态特性的设计分析,同时对分子流状态下的真空度变化对控制系统特性影响进行了计算机仿真分析,获得了部分有益的结论.     

惯性导航系统中加速度计标定方案设计与研究

本文主要基于车载筒装导弹基础之上,对捷联惯性导航系统的加速度计标定方法和误差机理进行了研究。首先,对惯性导航系统加速度计误差机理进行分析,提出了加速度计的标定补偿方案,以车载作为激励方式,设计了不开箱加速度计标定方法,该方法能够对误差进行补偿来提高关系导航系统的精度。     

车载激光冷却装置PLC控制系统研究

本文以某车载激光冷却装置为例,该激光冷却装置采用蓄冷+释冷的冷却方式,控制系统采用PLC程序控制。供水温度为控制对象,对蓄冷系统和释冷系统进行控制,利用PLC程序控制实现激光冷却装置的自动运行,并在自动运行过程中采用供水PID调节方式,达到节能运行目的。     

枕式包装机色标自动定位方法

目的受色标印刷偏差、张紧力失衡、机械振动等因素影响,很难保证色标定位的准确性,为了提高枕式包装机色标定位精度,提出一种色标自动定位方法,并基于PLC设计相应控制系统。方法通过分析包装机械运行规律,详细阐述色标补偿原理。利用色标、刀位检测信号判断横封和纵封是否同步,并计算偏差数值。以横封位置为基准,通过调整纵封电机的脉冲频率和脉冲个数进行定位补偿。同时基于PLC搭建枕式包装机的控制系统,并介绍控制系统的硬件结构和软件设计思想。最后进行实验研究。结果切点位置均在色标点上,可以实现色标定位。结论该控制系统和方法能够满足包装机械对定位精度的要求,提高了包装机械的包装精度、效率,降低了次品率。     

一种能效标识检测与识别系统

采用嵌入式视觉系统设计开发了一种能效标识检测与识别系统,其包括触摸屏、PLC控制系统、视觉系统和伺服跟踪装置。该系统利用嵌入式视觉和PLC技术,自动跟踪、检测能效标识,并作出各种判断和测量。实践表明,该系统稳定、可靠,在冰箱、洗衣机、空调等生产线上有着极大的应用空间和推广价值。     

等比力法与等角位置法测试加速度计误差模型系数的比较

阐述了在重力场下分别用等比力法和等角位置法标定加速度计的方法,给出了加速度计误差模型系数的不确定度公式,比较了两种方法的加速度计误差模型系数的标定精度,对加速度计进行了实际测试和误差分析,实验结果表明两种方法的加速度计标定精度各有优劣,可针对不同误差系数的标定精度选择其一。     

基于PLC的供配电监控系统的研究

近年来,PLC控制在炯厂的自动化领域使用也越来越普遍,尤其在变电站继电保护中已经用可编程控制器（PLC）代替了传统的继电器,实现了利用PLC构成自动重合闸装置的控制系统。PLC以其高可靠性、适应工业过程现场的联网功能特点,广泛的应用于烟厂的生产工艺过程。     

基于加速度计阵列的六自由度振动台测试方法研究

目前多自由度振动台缺乏方便有效的多自由度振动测试手段,通过探讨基于加速度传感器的六自由度振动测试方法,提出基于4只三向加速度计的加速度计阵列构型,依据六自由度运动系统方程对该构型的运动状态进行了理论推导,并设计了具体的封装方法,最后对封装的加速度计阵列构型进行了多自由度振动测试试验验证。试验结果表明:所提出的基于4只三向加速度计的加速度计阵列构型能够对角加速度进行测试与还原,简易可靠,可以作为多自由度振动的测试手段。本文提出的加速度计陈列构型有望被推广应用于现场低频振动测量或校准工作中。     

基于坐标测量机的铁路轮对参数的测量方案

设计了一种基于三坐标测量机的轮对几何参数自动测量装置,对其主要结构和工作原理作了详细分析,并给出来轮对几何参数的计算式。该测量装置结合了三坐标测量机测量精度高和自动测头智能化程度高的特点,可实现工件的自动、批量化检测,它对于解决目前轮对测量手段落后、测量误差大、劳动强度高等问题具有一定的实际意义。     

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 Institutions Expected to Update and Transfer Information on Present Standards

Standards are the basis for production enterprises to organize production, ex-factory inspection, trade (delivery) and technical exchanges, product certification, quality arbitration and supervision.……     

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.     

Optimum-Simulation von Ernteprozessen

Zusammenfassung Bei der Gestaltung von Ernteprozessen — beispielsweise des Prozesses Mähdrusch, Körnertransport und -abnahme — als transportverbundene Fließarbeitsverfahren mit mindestens zwei verschiedenen Arbeitsmitteln gibt es einen großen Optimierungsspielraum. Solche Prozesse sind mehrstufige Bedienungsprozesse mit gemischter Anordnung der Bedienungseinrichtungen. Außerdem besitzen sie stark ausgeprägte räumliche Aspekte. Es wird vor allem gezeigt, welche Merkmale solcher Prozesse in Simulationsmodellen abgebildet sein müssen, welche Zielgrößen in Abhängigkeit von welchen Einflußgrößen unter Berücksichtigung welcher Prozeßbedingungen ermittelt werden sollten und wie der Bewertungsprozeß zur Ermittlung der gewünschten Informationen gestaltet werden muß.     

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.     

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.