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德國REXROTH力士樂繼電器現貨庫存

繼電器是一種電控制器件，是當輸入量（激勵量）的變化達到規定要求時，在電氣輸出電路中使被控量發生預定的階躍變化的一種電器。它具有控制系統（又稱輸入回路）和被控制系統（又稱輸出回路）之間的互動關系。通常應用于自動化的控制電路中，它實際上是用小電流去控制大電流運作的一種“自動開關”。故在電路中起著自動調節、安全保護、轉換電路等作用。

繼電器是具有隔離功能的自動開關元件，廣泛應用于遙控、遙測、通訊、自動控制、機電一體化及電力電子設備中，是zui重要的控制元件之一。

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    繼電器一般都有能反映一定輸入變量（如電流、電壓、功率、阻抗、頻率、溫度、壓力、速度、光等）的感應機構（輸入部分）；有能對被控電路實現“通”、“斷”控制的執行機構（輸出部分）；在繼電器的輸入部分和輸出部分之間，還有對輸入量進行耦合隔離，功能處理和對輸出部分進行驅動的中間機構（驅動部分）。

    壓力繼電器是利用液體的壓力來啟閉電氣觸點的液壓電氣轉換元件。當系統壓力達到壓力繼電器的調定值時，發出電信號，使電氣元件（如電磁鐵、電機、時間繼電器、電磁離合器等）動作，使油路卸壓、換向，執行元件實現順序動作，或關閉電動機使系統停止工作，起安全保護作用等。
壓力繼電器有柱塞式、膜片式、彈簧管式和波紋管式四種結構形式。

    用于安全保護時，將壓力繼電器設置在夾緊液壓缸的一端，液壓泵啟動后，首先將工件夾緊，此時夾緊液壓缸的右腔壓力升高，當升高到壓力繼電器的調定值時，壓力繼電器動作，發出電信號使2YA通電，于是切削液壓缸進刀切削。在加工期間，壓力繼電器微動開關的常開觸點始終閉合。若工件沒有夾緊，壓力繼電器2斷開，于是2YA斷電，切削液壓缸立即停止進刀，從而避免工件未夾緊被切削而出事故。
    其次用于控制執行元件的順序動作時，液壓泵啟動后，首先2YA通電，液壓缸左腔進油，推動活塞方向右移。當碰到限位器(或死擋鐵)后，系統壓力升高，壓力繼電器發出電信號，使1YA通電，高壓油進入液壓缸的左腔，推動活塞右移。這時若3YA也通電，液壓缸的活塞快速右移;若3YA斷電，則液壓缸的活塞慢速右移，其慢速運動速度由節流閥調節。
    再次用于液壓泵卸荷時，壓力繼電器不是控制液壓泵停止轉動，而是控制二位二通電磁閥，將液壓泵5輸出的壓力油流回油箱，使其卸荷。
    zui后用于液壓泵的啟閉時，有兩個液壓泵，高壓小流量泵，低壓大流量泵。當活塞快速下降時，兩泵同時輸出壓力油。當液壓缸活塞桿抵住工件開始加壓時，壓力繼電器在壓力油作用下發出動作，觸動微動開關，將常閉觸點斷開，使液壓泵停轉。在加工過程中減慢液壓缸的速度，同時減少動力消耗。

注意： 壓力繼電器必須放在壓力有明顯變化的地方才能輸出電信號。若將壓力繼電器放在回油路上，由于回油路直接接回油箱，壓力也沒有變化，所以壓力繼電器也不會工作。

德國REXROTH力士樂繼電器現貨庫存

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