【正文】 ，通電后，電磁力直接把先導(dǎo)小閥和主閥關(guān)閉件依次向上提起，閥門打開。特點(diǎn)：a 流體壓力范圍上限較高，可任意安裝（需定制）但必須滿足流體壓差條件。選型依據(jù)：根據(jù)管道參數(shù)選擇電磁閥的：通徑規(guī)格（即DN）、接口方式1）按照現(xiàn)場管道內(nèi)徑尺寸或流量要求來確定通徑（DN）尺寸；2）接口方式，一般DN50要選擇法蘭接口，≤DN50則可根據(jù)用戶需要自由選擇。根據(jù)持續(xù)工作時間長短來選擇：常閉、常開、或可持續(xù)通電1）當(dāng)電磁閥需要長時間開啟，并且持續(xù)的時間多于關(guān)閉的時間應(yīng)選 用常開型；2）要是開啟的時間短或開和關(guān)的時間不多時，則選常閉型；3）但是有些用于安全保護(hù)的工況，如爐、窯火焰監(jiān)測，則不能選常開的，應(yīng)選可長期通電型。氨用閥則不能采用銅材。若超過此值，通徑大于15mm時，用多功能電磁閥；通徑小于15mm時，用高粘度電磁閥。4) 電源條件a 根據(jù)供電電源種類，分別選用交流和直流電磁閥。5) 控制精度a 普通電磁閥只有開、關(guān)兩個位置，在控制精度要求高和參數(shù)要求平穩(wěn)時需選用多位電磁閥；b 動作時間：指電信號接通或切斷至主閥動作完成時間；c 泄漏量：樣本上給出的泄漏量數(shù)值為常用經(jīng)濟(jì)等級。對于長時間閥門開通只有短時關(guān)閉的情況，則宜選用常開電磁閥。特別重要的，還應(yīng)采取兩只連用雙保險。五、安裝注意安裝時應(yīng)注意閥體上箭頭應(yīng)與介質(zhì)流向一致。通入的介質(zhì)應(yīng)無雜質(zhì)。在本設(shè)計中，燃?xì)獗碚９ぷ鲿r，顯示剩余燃?xì)饬?。本設(shè)計采用單片機(jī)AT89S52內(nèi)含看門狗功能，看門狗電路就是一個定時激活電路，其作用是防止單片機(jī)進(jìn)入死循環(huán)，監(jiān)控程序的正常工作。 氣量處理程序流程圖當(dāng)單片機(jī)處于休眠狀態(tài)時，延時十秒檢測有無中斷信號打破休眠狀態(tài)，進(jìn)入正常運(yùn)行狀態(tài)。在本系統(tǒng)的設(shè)計過程中，硬件方面的重點(diǎn)是燃?xì)獗頊y量電路、控制電路等的設(shè)計。 from the telephone, electric bell to the radio control model. Became popular youth radio technology, science and technology education is the most popular and most extensive content. So far, many of the older generation of engineers, experts, Professor of the year are radio enthusiasts. Fun radio technology, radio technology, prehensive training, from basic principles of electronics, electronic ponents to the radiobased remote control, telemetry, remote electronic systems, has trained several generations of technological excellence.Second, from the popularity of the radio era to era of electronic technology The early radio technology to promote the development of electronic technology, most notably electronic vacuum tube technology to semiconductor electronic technology. Semiconductor technology to realize the active device miniaturization and low cost, so more popular with radio technology and innovation, and to greatly broaden the number of nonradiocontrol areas. The development of semiconductor technology lead to the production of integrated circuit, forming the modern electronic technology leap from discrete electronics into the era of era of integrated circuits. Electronic design engineers no longer use the discrete electronic ponents designed circuit modules, and direct selection of integrated circuit ponents constitute a single system. They freed the design of the circuit unit dedicated to system design, greatly liberating the productive forces of science and technology, promote the wider spread of electronic systems. Semiconductor integrated circuits in the basic digital logic circuits first breakthrough. A large number of digital logic circuits, such as gates, counters, timers, shift registers, and analog switches, parators, etc., for the electronic digital control provides excellent conditions for the traditional mechanical control to electronic control. Power electronic devices and sensor technology to make the original to the radio as the center of electronic technology turned to mechanical engineering in the field of digital control systems, testing in the field of information collection, movement of electrical mechanical servo drive control object. Semiconductor and integrated circuit technology will bring us a universal age of electronic technology, wireless technology as the field of electronic technology a part of. 70 years into the 20th century, large scale integrated circuit appeared to promote the conventional electronic circuit unitspecific electronic systems development. Many electronic systems unit into a dedicated integrated devices such as radios, elect。參考文獻(xiàn)[l]周曉中，杜偉，2006，27(l):84～86[2][M].重慶:重慶出版社，～30[3][J]，1999，19(3):48～50[4][J]，1994(6):12～16[5]:清華大學(xué)出版社，1996.[6](IC)卡規(guī)范砰().北京:中國金融出版社，1998[7][J]，1998，12(4):32～39[8][J]，1996(2):7～9[9]:握奇智能科技有限公司，2002(l):4[l0][J]，2007，383(l):20～22[l1]陳伯揚(yáng)，2008，22(2):41～43[l2]，2004，8(1):54～56[13][J]，2000,(l):21～22[l4][J]，2004，18(6):26～28[l5][M].機(jī)械工業(yè)出版社，2005.[16] Gas Research Institute ,Gas metersSmaller, Betterlooking and Smarter, GRI Report ,Technology Focus,Chicago,1992.中英文翻譯 From the world of radio in the world to a single chipModern puter technology, industrial revolution, the world economy from the capital into the economy to knowledge economy. Field in the electronic world, from the 20th century into the era of radio to puter technology in the 21st century as the center of the intelligent modern era of electronic systems. The basic core of modern electronic systems are embedded puter systems (referred to as embedded systems), while the microcontroller is the most typical and most extensive and most popular embedded systems.First, radio has created generations of excellence in the worldFifties and sixties in the 20th century, the most representative of the advanced electronic technology is wireless technology, including radio broadcasting, radio, wireless munications (telegraph), Amateur Radio, radio positioning, navigation and other telemetry, remote control, remote technology. Early that these electronic technology led many young people into the wonderful digital world, radio show was a wonderful life, the prospects for science and technology. Electronics began to form a new discipline. Radio electronics, wireless munications began eworld journey.Radio technology not only as a representative of advanced science and technology at that time, but also from popular to professional fields of science, attracting the young people and enable them to find a lot of fun. Ore from the bedside to the superheterodyne radio radio。 第5章 總結(jié)本設(shè)計主要闡述了IC卡燃?xì)獗淼挠布?、軟件設(shè)計方案，包括系統(tǒng)功能，工作原理、結(jié)構(gòu)框圖、硬件各部分電路設(shè)計及其軟件程序編寫等。 氣量處理是指當(dāng)燃?xì)獗碚９ぷ鲿r通過對總氣量的處理顯示剩余氣量，當(dāng)插入卡時通過讀入卡內(nèi)氣量值與剩余氣量相加得到新的總氣量，同時將卡內(nèi)的數(shù)值清零。 主程序流程圖 IC卡讀寫程序 IC卡檢測流程采用了智能化的設(shè)計，首先檢測是否有IC卡插入，在檢測有正確IC卡存在的前提下，對IC卡密碼進(jìn)行核對，讀取IC卡存儲內(nèi)容后，進(jìn)行相應(yīng)的處理，插卡中斷子程序主要是當(dāng)單片機(jī)處于休眠狀態(tài)時，有卡插入激活單片機(jī)，從而對卡進(jìn)行讀卡操作，并顯示讀卡結(jié)果。第4章 軟件設(shè)計 主程序的功能是首先對所有芯片復(fù)位，