其實(shí)用于控制執(zhí)行元件的順序動(dòng)作時(shí)，液壓泵啟動(dòng)后，首先2YA通電，液壓缸左腔進(jìn)油，推動(dòng)活塞方向右移。當(dāng)碰到限位器(或死擋鐵)后，系統(tǒng)壓力升高，壓力繼電器發(fā)出電信號(hào)，使1YA通電，高壓油進(jìn)入液壓缸的左腔，推動(dòng)活塞右移。這時(shí)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(yùn)動(dòng)速度由節(jié)流閥調(diào)節(jié)。
再次用于液壓泵卸荷時(shí)，壓力繼電器不是控制液壓泵停止轉(zhuǎn)動(dòng)，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。
最后用于液壓泵的啟閉時(shí)，有兩個(gè)液壓泵，高壓小流量泵，低壓大流量泵。當(dāng)活塞快速下降時(shí)，兩泵同時(shí)輸出壓力油。當(dāng)液壓缸活塞桿抵住工件開始加壓時(shí)，壓力繼電器在壓力油作用下發(fā)出動(dòng)作，觸動(dòng)微動(dòng)開關(guān)，將常閉觸點(diǎn)斷開，使液壓泵停轉(zhuǎn)。在加工過程中減慢液壓缸的速度，同時(shí)減少動(dòng)力消耗。


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