描述
行程開(kāi)關(guān)(ST)行程開(kāi)關(guān)又稱為限位開(kāi)關(guān)。是一種根據(jù)運(yùn)動(dòng)部件的行程位置而切換電路的電器,用于反映機(jī)構(gòu)的運(yùn)動(dòng)方向或所在位置,可實(shí)現(xiàn)行程控制及極限位置的保護(hù)。行程開(kāi)關(guān)分為有觸點(diǎn)式和無(wú)觸點(diǎn)式兩種,常見(jiàn)無(wú)觸點(diǎn)式行程開(kāi)關(guān)為高頻振蕩型接近開(kāi)關(guān),它是由裝在運(yùn)動(dòng)部件上的一個(gè)金屬片接近或離開(kāi)振蕩線圈來(lái)實(shí)現(xiàn)控制的。接近開(kāi)關(guān)有使用壽命長(zhǎng)、操作頻率高、定位精度好、反應(yīng)迅速的特點(diǎn),有觸點(diǎn)行程開(kāi)關(guān)動(dòng)作原理與按鈕類(lèi)似,動(dòng)作時(shí)碰按行程開(kāi)關(guān)的頂桿。按結(jié)構(gòu)可分為直動(dòng)式、滾輪式和微動(dòng)式三種。直動(dòng)式結(jié)構(gòu)簡(jiǎn)單,因其觸點(diǎn)的分合速度取決于擋塊的移動(dòng)速度,當(dāng)擋塊的移動(dòng)速度低于0.4m/min時(shí),觸點(diǎn)切斷太慢,使電弧在觸點(diǎn)上停留太長(zhǎng),易于燒蝕觸點(diǎn)。此時(shí)可以選用有盤(pán)形彈簧機(jī)構(gòu)能瞬時(shí)動(dòng)作的滾輪式行程開(kāi)關(guān),其特點(diǎn)是通斷時(shí)間不受擋塊的移動(dòng)速度的影,動(dòng)作快;缺點(diǎn)是結(jié)構(gòu)復(fù)雜,價(jià)格高。為克服直動(dòng)式結(jié)構(gòu)的問(wèn)題,還可以選用有彎片狀彈簧的微動(dòng)式行程開(kāi)關(guān),這種行程開(kāi)關(guān)更為靈巧,敏捷,缺點(diǎn)是不耐用。
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主營(yíng):世界知名品牌的PLC、DCS系統(tǒng)備件模塊
①Allen-Bradley(美國(guó)AB)系列產(chǎn)品》
②Schneider(施耐德電氣)系列產(chǎn)品》
③General electric(通用電氣)系列產(chǎn)品》
④Westinghouse(美國(guó)西屋)系列產(chǎn)品》
⑤SIEMENS(西門(mén)子系列產(chǎn)品)》
⑥銷(xiāo)售ABB Robots.FANUC Robots、YASKAWA Robots、KUKA Robots、Mitsubishi Robots、OTC Robots、PanasonicRobots、MOTOMAN Robots。
⑦estinghouse(西屋):OVATION系統(tǒng)、WDPF系統(tǒng)、MAX1000系統(tǒng)備件。
⑧Invensys Foxboro(??怂共_):I/A Series系統(tǒng),F(xiàn)BM(現(xiàn)場(chǎng)輸入/輸出模塊)
順序控制、梯形邏輯控制、事故追憶處理、數(shù)模轉(zhuǎn)換、輸入/輸出信號(hào)處理、數(shù)
據(jù)通信及處理等。Invensys Triconex:冗余容錯(cuò)控制系統(tǒng)、基于三重模件冗余(TMR)
結(jié)構(gòu)的zui現(xiàn)代化的容錯(cuò)控制器。
⑨Siemens(西門(mén)子):Siemens MOORE,Siemens Simatic C1,Siemens數(shù)控系統(tǒng)等。
⑩Bosch Rexroth(博世力士樂(lè)):Indramat,I/O模塊,PLC控制器,驅(qū)動(dòng)模塊等。
◆Motorola(摩托羅拉):MVME 162、MVME 167、MVME1772、MVME177等系列。
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