电子皮带秤的安装环境条件

电子皮带秤的实际使用精确度除了与电子皮带秤本身的质量有关外,还取决于皮带秤安装位置的选定、皮带输送机的状况和安装质量等安装环境条件,本文首先介绍了安装环境条件包含的具体内容,然后列举了几个改变安装环境条件从而提高电子皮带秤实际使用精确度的实例。     

电子皮带秤现场使用中存在若干问题的分析和解决途径

分析了电子皮带秤在现场使用时所遇到的问题，提出了解决问题的具体措施。文章指出，一合电子皮带秤能否正确地安装、调试和校验是保证电子皮带秤称量准确度、稳定性的关键，只有解决好现场使用中的具体问题，才能给用户提供可靠的称量数据。     

电子皮带秤安装的几个问题

本文介绍了电子皮带秤的使用环境条件对提高称量精确度的重要性,并针对“任何一条皮带输送机都可以安装电子皮带秤”、“皮带秤装在哪个位置都可以”、“皮带秤的称量托辊要装得比邻近托辊高一点”的错误观点介绍了电子皮带秤安装的基本要求.     

电子皮带秤使用误差的原因分析与对策

着重分析了电子皮带秤在使用过程产生误差的原因,并对电子皮带秤使用现场的皮带机、环境、维护等影响因素提出了相应对策.     

多托辊双杠杆式电子皮带秤

秤架、传感器和显示仪表是影响电子皮带秤精确度的三个要素。近年来,传感器、显示仪表已取得了工艺上的突破,相比之下,秤架就成了影响电子皮带秤性能的关键因素。本文详细介绍了多托辊电子皮带秤的几种典型结构,并对其特点作了定性分析,对电子皮带秤的研制、生产和使用有一定参考价值。     

与电子皮带秤精确度有关技术性能试验评定方法的探讨

电子皮带秤的精确度评定是其生产使用中最关键的问题之一,而精确度则主要取决于电子皮带秤本身的质量和正确的安装使用。本文作者在参阅了国内外有关技术资料的基础上,根据国内电子皮带秤研制生产现状、技术水平和测试技术条件,对与其精确度有关技术性能的试验评定方法作了探讨。     

基于PLC的电子皮带秤在烟草制丝生产线上的应用

主要介绍了基于PLC的悬浮式电子皮带秤在四川某烟草公司制丝生产线中的应用,介绍了悬浮式皮带秤的构成与工作原理,并从硬件、软件角度阐述了PLC如何实现对皮带秤的控制。     

电子皮带秤的现场试验及误差分析

电子皮带秤的使用效果不仅与仪表的精度和可靠性,而且与正确的安装和使用密切有关。本文作者根据实践经验,介绍了电子皮带秤的现场试验和动态标定,并对现场标定的误差作了比较和分析。     

电子皮带秤的精确度分析

电子皮带秤是连续计量由胶带运输机输送的固体散状物料的称量仪表之一。本文就摩擦力、皮带张力、皮带硬度、托辊数等对精确度的影响作了分析,从而对如何提高国产电子皮带秤精确度的问题提出了措施。     

基于CAN总线的电子皮带秤系统设计

本文主要介绍了CAN总线的优点及其在电子皮带秤系统中的应用．其次阐述了电子皮带秤的动态称重原理以及电子皮带秤控制器的设计，同时说明了CAN总线通信技术在电子皮带秤系统中的工作原理。     

电子胶带秤在立井砂石散料回填计量中的应用

主要介绍了电子胶带秤的结构组成、工作原理、安装及校验方法,系统分析了电子胶带秤误差产生的原因,结合实际使用的经验提出了一些减小误差的方法。     

分体式电子皮带秤的设计与实现

针对工矿领域散装物料动态计量存在计量精度低、计量设备运行欠稳定等问题,对动态称重工作原理进行分析研究,设计了一套分体式电子皮带秤作为动态计量设备。设备通过ARM7芯片对物料重量信号和速度信号实施实时采集,并依据动态计量计算公式,实现物料流量的实时计算。设备同时具有标准的4～20 mA模拟信号输出接口和RS-232通信接口,工厂DCS和本地上位机可以通过上述接口实施设备监控。产品测试和应用表明,该方案设计的电子皮带秤运行可靠,计量精度高,产品适用性好。     

电子皮带秤在线准确性研究

电子皮带秤是以微处理器为核心的积分仪器,本文通过研究皮带秤系统的变化,找出引起误差的主要原因,通过调整,消除了系统误差对皮带秤称量的影响。     

定量配料实践教学的远程监控系统设计

针对定量配料加工过程粉尘大、噪声大不适合长期监看加工,定量配料实践教学的远程监控系统设计采用了远程计算机MCGS组态软件来监控多台皮带秤配料加工过程。网络控制网关解析MCGS组态软件通过RS485发出的命令,分别监控各台皮带秤稳定工作。网络控制网关采用的是嵌入式ARMLPC2136芯片开发,LPC2136微处理器是高性能、低功耗、高集成度并具有工业级温度范围和性能的微处理器。     

I have seen the future: it is flooded with email

I have been using electronic mail for years, first via Bitnet, then via the Internet. What do you do when you get email from someone you know? Delete it? No, of course not. You read it and you answer it. Therein lies my problem. Everyone is answering me! A few months ago, when I logged on, I had five or six messages each day. Now I log on to find 10 or 20 messages, all of them requiring a response. I suppose I could delete them, but friends are hard to find, so I find myself reading and responding to more and more messages-often on subjects I don't really care about. Everyone, it seems, feels it is better to send than to receive. Did Alvin Toffler warn us about this? I have had a vision of the future. In it, we live in a virtual-reality environment and we spend all our waking hours as employees of the US Electronic Postal Service. Wake me when it's over     

EDI Integrity Controls

Abstract

It is Monday morning and you begin your pre-work ritual by going to the World Wide Web and checking the morning electronic newspapers. In the past you might have read the paper edition of The New York Times or The Wall Street Journal; but with free news services and robust search features available on the Internet, you have decided to spare the expense and now the Internet is your primary news source. Your homepage automatically opens to the electronic edition of your favorite news site where you see the latest headline, “Electronic Terrorist Group Responsible for Hundreds of Fatalities.” Now wishing that you had the paper edition, you wonder if this news story is real or simply a teenage hacker's prank. This would not be the first time that a major news service had its Web site hacked. You read further and the story unfolds.     

Do you know what your license allows?

Before you push a key to load a program and display it on your monitor, ask yourself this question: “Do I have the power to use this program?” Using software requires power-not physical or electrical power-but the legal power of authorized use. If you are not the program's author or owner, you can only obtain this power through a license-a legal document that states your rights regarding use of the program. This may include the right to use or operate the program as an end user; modify the program through deletions, additions or enhancements as a value-added reseller or original equipment manufacturer; or transfer the program to another as an aggregator, distributor or retailer. If you do not have the appropriate legal power, then your conduct is illegal. If you know that you do not have the appropriate legal power, then your conduct, which amounts to software piracy, is criminal     

Copyright and work made for hire

Legal and policy aspects of information-technology use and development are discussed. Undoubtedly the most important and powerful legal right you can have as a program writer is to own the copyright to your software. If you have written the program without being hired to do so, you can claim the copyright, usually without complications. The courts have established that programs are no different from any other literary creation. You may claim a copyright just as an author may claim a copyright to a story. Moreover, you don't have to register the copyright; it is automatically in effect when you create the program. But what if you have been hired by someone to write a program? Do you own it, or does the party who hired you? The answer lies in an analysis of the work-made-for-hire doctrine in copyright law. The law maintains that when the program is created by a person employed by another party, the program is considered work made for hire, and the party for whom the work was prepared is the author and has the copyright. This is generally the case unless the parties involved have a written agreement to the contrary     

网络化高精度和高稳定性阵列电子胶带秤仪表

通过设计高灵敏秤体、提高称重传感器采样精度等提高电子胶带秤计量精度的传统方法很难补偿胶带张力引起的称重误差;而通过并行设置多个秤体、构成阵列秤的方式能够减小胶带张力对计量精度的影响。基于内力理论分析得出电子胶带秤首尾两端的胶带张力是造成称重误差的主要原因,且两端胶带张力占比随称重单元增多而变小,因此阵列电子胶带秤可改善胶带张力变化对计量精度的影响和稳定性。设计了以高性能ARM处理器STM32F767为控制核心的网络化高精度和高稳定性阵列电子胶带秤仪表,实现了8路称重阵列动态计量、逻辑控制、人机交互、掉电存储、工业控制与通信、互联网远程监控等功能。采用静态挂码方式对该仪表进行试验,结果表明该仪表的称重误差约为0.03%,且对胶带速度和载荷引起的张力变化不敏感,具有较高的计量精度和稳定性。