描述
延時控制通常應(yīng)用在開關(guān)量控制的場合,當(dāng)一個開關(guān)狀態(tài)變化時(比如由開變關(guān)時),控制器的輸出動作要延時一段時間才會給出。比如,在生產(chǎn)線常用的接近開關(guān),當(dāng)工件就位時,接近開關(guān)給出信號,下一個滾筒由于和接近開關(guān)安裝的位置有一段距離,所以通常要延遲幾秒才開始滾動。連鎖控制也是常用于開關(guān)控制的場合,比如有三個開關(guān),A、B和C,C開關(guān)必須在A和B同時打開的時候,才能夠打開;或者當(dāng)A打開時,C必須打開;這種關(guān)系就是連鎖控制。在工業(yè)現(xiàn)場中,尤其是在涉及安全控制的場合,連鎖控制方式是很常見的。比如反應(yīng)釜中的放散閥,當(dāng)壓力達到一定值時,壓力開關(guān)的信號發(fā)生變化,則放散閥門必須立刻打開。電動控制指控制系統(tǒng)的輸出是通過電氣量或電子信號來進行的,所控制的對象是電動執(zhí)行元件,比如繼電器、步進開關(guān)、電磁閥、伺服驅(qū)動器和變頻器等等,絕大部分的自動控制多多少少都會有電動控制元件。液壓控制在機器與設(shè)備的操作中,許多控制是用液壓控制機構(gòu)來進行的。在連續(xù)速度控制的場合,液壓控制通常比較方便和便宜,當(dāng)能量轉(zhuǎn)換效率較高的時候,液壓控制往往和電動控制中的伺服控制同時使用。這時,就形成了效率和精度較高的電液執(zhí)行機構(gòu)。
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