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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    行程開關(guān)分類

    2013/12/30 8:17:39      點(diǎn)擊:
    行程開關(guān) 按結(jié)構(gòu)分
     概述行程開關(guān)符號(hào)行程開關(guān)按其結(jié)構(gòu)可分為直動(dòng)式、滾輪式、微動(dòng)式和組合式。直動(dòng)式行程開關(guān)動(dòng)作原理同按鈕類似,所不同的是:一個(gè)是手動(dòng),另一個(gè)則由運(yùn)動(dòng)部件的撞塊碰撞。當(dāng)外界運(yùn)動(dòng)部件上的撞塊碰壓按鈕使其觸頭動(dòng)作,當(dāng)運(yùn)動(dòng)部件離開后,在彈簧作用下,其觸頭自動(dòng)復(fù)位。
    其結(jié)構(gòu)原理如圖F1所示,其動(dòng)作原理與按鈕開關(guān)相同,但其觸點(diǎn)的分合速度取決于生產(chǎn)機(jī)械的運(yùn)行速度,不宜用于速度低于0.4m/min的場(chǎng)所。
    直動(dòng)式行程開關(guān)組成
    1:推桿 2&4:彈簧 3:動(dòng)斷觸點(diǎn) 5:動(dòng)合觸點(diǎn)
    滾輪式行程開關(guān)
    當(dāng)運(yùn)動(dòng)機(jī)械的擋鐵(撞塊)壓到行程開關(guān)的滾輪上時(shí),傳動(dòng)杠連同轉(zhuǎn)軸一同轉(zhuǎn)動(dòng),使凸輪推動(dòng)撞塊,當(dāng)撞塊碰壓到一定位置時(shí),推動(dòng)微動(dòng)開關(guān)快速動(dòng)作。當(dāng)滾輪上的擋鐵移開后,復(fù)位彈簧就使行程開關(guān)復(fù)位。這種是單輪自動(dòng)恢復(fù)式行程開關(guān)。而雙輪旋轉(zhuǎn)式行程開關(guān)不能自動(dòng)復(fù)原,它是依靠運(yùn)動(dòng)機(jī)械反向移動(dòng)時(shí),擋鐵碰撞另一滾輪將其復(fù)原。
    其結(jié)構(gòu)原理如圖F2所示,當(dāng)被控機(jī)械上的撞塊撞擊帶有滾輪的撞桿時(shí),撞桿轉(zhuǎn)向右邊,帶動(dòng)凸輪轉(zhuǎn)動(dòng),頂下推桿,使微動(dòng)開關(guān)中的觸點(diǎn)迅速動(dòng)作。當(dāng)運(yùn)動(dòng)機(jī)械返回時(shí),在復(fù)位彈簧的作用下,各部分動(dòng)作部件復(fù)位。
    滾輪式行程開關(guān)組成
    1:滾輪 2:上轉(zhuǎn)臂 3&5&11:彈簧 4:套架
    6:滑輪 7:壓板 8&9:觸點(diǎn) 10:橫板
    滾輪式行程開關(guān)又分為單滾輪自動(dòng)復(fù)位和雙滾輪(羊角式)非自動(dòng)復(fù)位式,雙滾輪行移開關(guān)具有兩個(gè)穩(wěn)態(tài)位置,有“記憶”作用,在某些情況下可以簡(jiǎn)化線路。
    微動(dòng)開關(guān)式行程開關(guān)
    微動(dòng)開關(guān)式行程開關(guān)的組成,以常用的有LXW-11系列產(chǎn)品為例,其結(jié)構(gòu)原理如圖F3所示:
    1:推桿 2:彈簧 3:動(dòng)合觸點(diǎn) 4:動(dòng)斷觸點(diǎn) 5:壓縮彈簧

    按用途分

    一般用途行程開關(guān):如JW2、JW2A、LX19、LX31、LXW5、3SE3等系列。主要用于機(jī)床及其他生產(chǎn)機(jī)械、自動(dòng)生產(chǎn)線的限位和程序控制。
    起重設(shè)備用行程開關(guān),如LX22、LX33系列。主要用于限制起重設(shè)備及各種冶金輔助機(jī)械的行程。
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