R901130967 HED8OA-2X/630K14SV力士樂壓力繼電器
是百士自動化【主營產(chǎn)品】之一,手機/微信號;15307130607,聯(lián)系人;黃依依,在線QQ;2829871406,電話:027-87680708
武漢百士自動化設備有限公司專注于液壓、氣動、工控自動化備件銷售,熱誠歡迎新老客戶咨詢購買!
我司主要經(jīng)銷氣動,液壓,工控自動化流體控制設備備品備件
主營品牌:博世力士樂BOSCH-REXROTH、安沃馳AVENTICS、迪普馬DUPLOMATIC、愛爾泰克AIRTEC、本特利Bently、貝加萊B&R、世格ASCO、阿托斯ATOS。
主要涵蓋產(chǎn)品:電磁閥、比例閥、單向閥、溢流閥、壓力繼電器、壓力傳感器、葉片泵、柱塞泵、齒輪泵、蓄能器、氣動閥、氣缸、氣源處理單元、探頭、前置器、延伸電纜、監(jiān)測模塊、校驗儀、伺服驅(qū)動器、PLC模塊、I/O模塊、伺服電機、觸摸屏等。
1.壓力繼電器,液壓術語,是液壓系統(tǒng)中當流體壓力達到預定值時,使電接點動作的元件。
2.是將壓力轉(zhuǎn)換成電信號的液壓元器件,客戶根據(jù)自身的壓力設計需要,通過調(diào)節(jié)壓力繼電器,實現(xiàn)在某一設定的壓力時,輸出一個電信號的功能。
工作原理
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(zhuǎn)換元件。當系統(tǒng)壓力達到壓力繼電器的調(diào)定值時,發(fā)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(zhí)行元件實現(xiàn)順序動作,或關閉電動機使系統(tǒng)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(jié)構形式。下面對柱塞式壓力繼電器(見圖)的工作原理作一介紹:
當從繼電器下端進油口3進入的液體壓力達到調(diào)定壓力值時,推動柱塞2上移,此位移通過杠桿放大后推動微動開關4動作。改變彈簧1的壓縮量,可以調(diào)節(jié)繼電器的動作壓力。
應用場合:用于安全保護、控制執(zhí)行元件的順序動作、用于泵的啟閉、用于泵的卸荷。
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。
2選用標準
根據(jù)所測對象的壓力來選用,比如所測壓力范圍在8KG以內(nèi),那么就要選用額定10KG的壓力繼電器,還有要符合電路中的額定電壓,接口管徑的大小
3使用方法
首先用于安全保護時,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(diào)定值時,壓力繼電器動作,發(fā)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。
其實用于控制執(zhí)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(tǒng)壓力升高,壓力繼電器發(fā)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(jié)流閥調(diào)節(jié)。
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(zhuǎn)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。
最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(fā)出動作,觸動微動開關,將常閉觸點斷開,使液壓泵停轉(zhuǎn)。在加工過程中減慢液壓缸的速度,同時減少動力消耗。
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