壓力繼電器的使用安全范圍解析
壓力繼電器能用在安全(quan)保護，控制執行元件的順序動作，泵的啟閉，液壓泵卸(xie)荷等(deng)地方。
首先(xian)用于安(an)全保護時，將壓力繼(ji)電(dian)器設(she)置在夾緊的(de)(de)(de)一端，液(ye)(ye)壓(ya)(ya)(ya)泵啟動(dong)(dong)后，首(shou)先將工件(jian)夾(jia)緊(jin)(jin)，此時夾(jia)緊(jin)(jin)液(ye)(ye)壓(ya)(ya)(ya)缸的(de)(de)(de)右腔壓(ya)(ya)(ya)力升高，當升高到壓(ya)(ya)(ya)力繼電(dian)器(qi)(qi)的(de)(de)(de)調定(ding)值(zhi)時，壓(ya)(ya)(ya)力繼電(dian)器(qi)(qi)動(dong)(dong)作，發出電(dian)信號使2YA通電(dian)，于(yu)是切(qie)(qie)削(xue)液(ye)(ye)壓(ya)(ya)(ya)缸進刀(dao)切(qie)(qie)削(xue)。在加工期間(jian)，壓(ya)(ya)(ya)力繼電(dian)器(qi)(qi)微動(dong)(dong)開關的(de)(de)(de)常開觸點始終閉合。若工件(jian)沒有(you)夾(jia)緊(jin)(jin)，壓(ya)(ya)(ya)力繼電(dian)器(qi)(qi)2斷開，于(yu)是2YA斷電(dian)，切(qie)(qie)削(xue)液(ye)(ye)壓(ya)(ya)(ya)缸立即停止進刀(dao)，從而(er)避免工件(jian)未夾(jia)緊(jin)(jin)被(bei)切(qie)(qie)削(xue)而(er)出事故。
其(qi)次用(yong)于控制執行元件的順序動(dong)作時，液(ye)壓(ya)泵(beng)啟動(dong)后，首先2YA通(tong)(tong)電(dian)，液(ye)壓(ya)缸(gang)左腔進(jin)油，推動(dong)活(huo)塞方向(xiang)右(you)移。當碰到(dao)限位(wei)器（或死擋鐵）后，系統壓(ya)力升(sheng)高(gao)，壓(ya)力繼電(dian)器發出電(dian)信號，使1YA通(tong)(tong)電(dian)，高(gao)壓(ya)油進(jin)入液(ye)壓(ya)缸(gang)的左腔，推動(dong)活(huo)塞右(you)移。這(zhe)時若(ruo)3YA也通(tong)(tong)電(dian)，液(ye)壓(ya)缸(gang)的活(huo)塞快速(su)(su)右(you)移；若(ruo)3YA斷電(dian)，則液(ye)壓(ya)缸(gang)的活(huo)塞慢速(su)(su)右(you)移，其(qi)慢速(su)(su)運動(dong)速(su)(su)度(du)由節(jie)(jie)流閥調(diao)節(jie)(jie)。
再次用(yong)于(yu)液(ye)壓泵卸(xie)荷(he)時(shi)，壓力繼(ji)電(dian)器不是控(kong)制(zhi)液(ye)壓泵停止轉動，而(er)是控(kong)制(zhi)二(er)位二(er)通電(dian)磁閥，將液(ye)壓泵5輸出(chu)的壓力油(you)流(liu)回油(you)箱，使其(qi)卸(xie)荷(he)。
最后用(yong)于液壓(ya)(ya)(ya)(ya)(ya)泵的(de)啟閉時(shi)，有兩個液壓(ya)(ya)(ya)(ya)(ya)泵，高壓(ya)(ya)(ya)(ya)(ya)小流量(liang)泵，低壓(ya)(ya)(ya)(ya)(ya)大(da)流量(liang)泵。當(dang)活(huo)塞(sai)快速下降時(shi)，兩泵同時(shi)輸出壓(ya)(ya)(ya)(ya)(ya)力油。當(dang)液壓(ya)(ya)(ya)(ya)(ya)缸活(huo)塞(sai)桿抵住(zhu)工件開始加(jia)壓(ya)(ya)(ya)(ya)(ya)時(shi)，壓(ya)(ya)(ya)(ya)(ya)力繼電器在壓(ya)(ya)(ya)(ya)(ya)力油作用(yong)下發出動(dong)作，觸(chu)動(dong)微動(dong)開關(guan)，將常閉觸(chu)點斷開，使液壓(ya)(ya)(ya)(ya)(ya)泵停轉(zhuan)。在加(jia)工過程中(zhong)減(jian)慢(man)液壓(ya)(ya)(ya)(ya)(ya)缸的(de)速度，同時(shi)減(jian)少動(dong)力消耗(hao)。
