Mike Krzyzewski is really a famous coach of Dream Team. She has coached north america men's basketball team for some time, that's clinched numerous medals for his country. Following Londonfl jerseys supplyn Olympic was over, Krzyzewski told The Associated Press that this game will be his final one as national coach, a job he's held for seven years. He had left open the possibility of swomen nfl jerseystaying with the team beyond the London Games, when practice on Saturday said these will be his last Olympics.When asked if he was sure, Krzyzewski didn't hesitate before again saying, "yecheap nfl jerseys wholesales," this will be his last game "If we could win it, then it might be three major championships in a row, i always do not know when that has been done because we haven't usually won http://govoriotkrito.bg/libs/nflcn08.htmthe globe championships," Krzyzewski said. "It becomes an enormous thing for the program." Whatever, he's an awesome coach. His achievement are going to be remembered by the country.cheap nfl jerseys
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      1. 行程開關(guān)用途

        2013/12/30 8:19:38      點擊:
        行程開關(guān) 日常生活行程開關(guān)的應(yīng)用方面很多,很多電器里面都有它的身影。那這么簡單的開關(guān)能起什么作用呢?它主要是起連鎖保護的作用。最常見的例子莫過于其在洗衣機和錄音機(錄像機)中的應(yīng)用了。
        在洗衣機的脫水(甩干)過程中轉(zhuǎn)速很高,如果此時有人由于疏忽打開洗衣機的門或蓋后,再把手伸進去,很容易對人造成傷害,為了避免這種事故的發(fā)生,在洗衣機的門或蓋上裝了個電接點,一旦有人開啟洗衣機的門或蓋時,就自動把電機斷電,甚至還要靠機械辦法聯(lián)動,使門或蓋一打開就立刻“剎車”,強迫轉(zhuǎn)動著的部件停下來,免得傷害人身。
        在錄音機和錄像機中,我們常常使用到快進或者倒帶,磁帶急速地轉(zhuǎn)動,但是當(dāng)?shù)竭_磁帶的端點時會自動停下來。在這里行程開關(guān)又一次發(fā)揮了作用,不過這一次不是靠碰撞而是靠磁帶的張力的突然增大引起動作的。
        工業(yè)

        行程開關(guān)主要用于將機械位移轉(zhuǎn)變成電信號,使電動機的運行狀態(tài)得以改變,從而控制機械動作或用作程序控制。
        行程開關(guān)真正的用武之地是在工業(yè)上,在那里它與其它設(shè)備配合,組成更復(fù)雜的自動化設(shè)備。
        機床上有很多這樣的行程開關(guān),用它控制工件運動或自動進刀的行程,避免發(fā)生碰撞事故。有時利用行程開關(guān)使被控物體在規(guī)定的兩個位置之間自動換向,從而得到不斷的往復(fù)運動。比如自動運料的小車到達終點碰著行程開關(guān),接通了翻車機構(gòu),就把車?yán)锏奈锪戏钩鰜,并且退回到起點。到達起點之后又碰著起點的行程開關(guān),把裝料機構(gòu)的電路接通,開始自動裝車?偸沁@樣下去,就成了一套自動生產(chǎn)線,用不著人管,日以繼夜地工作,節(jié)省了人的體力勞動。
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