REXROTH比例閥對流量的控制可以分為兩種: 一(yi)種是開(kai)關控(kong)制:要(yao)么(me)全開(kai)、要(yao)么(me)全關,流(liu)量要(yao)么(me)zui大、要(yao)么(me)zui小,沒有中間狀態,如普通的電(dian)磁直通閥(fa)(fa)、電(dian)磁換(huan)向(xiang)閥(fa)(fa)、電(dian)液(ye)換(huan)向(xiang)閥(fa)(fa)。 另(ling)一種是連續控(kong)(kong)制:閥口可以(yi)根據需(xu)要打(da)開任意一個開度,由此控(kong)(kong)制通(tong)過流量的(de)大(da)小,這類閥有(you)手(shou)動(dong)控(kong)(kong)制的(de),如節流閥,也(ye)有(you)電(dian)控(kong)(kong)的(de),如比例(li)閥、伺服(fu)閥。 所以(yi)使用(yong)比例閥或伺(si)服閥的(de)目的(de)就是(shi)(shi):以(yi)電控(kong)(kong)方(fang)式實現對流(liu)量的(de)節流(liu)控(kong)(kong)制(當然經過(guo)結(jie)構(gou)上的(de)改(gai)動也可實現壓力控(kong)(kong)制等(deng)),既然是(shi)(shi)節流(liu)控(kong)(kong)制,就必然有能量損失,伺(si)服閥和其它閥不同(tong)的(de)是(shi)(shi),它的(de)能量損失更大一(yi)些(xie),因為它需要一(yi)定的(de)流(liu)量來維持前(qian)置級(ji)控(kong)(kong)制油路的(de)工作。 REXROTH電氣比例閥: 自動(dong)控(kong)(kong)(kong)制(zhi)可分成(cheng)(cheng)斷續(xu)(xu)控(kong)(kong)(kong)制(zhi)和連續(xu)(xu)控(kong)(kong)(kong)制(zhi)。斷續(xu)(xu)控(kong)(kong)(kong)制(zhi)即開(kai)關控(kong)(kong)(kong)制(zhi)。氣動(dong)控(kong)(kong)(kong)制(zhi)系統(tong)中使(shi)用動(dong)作頻率(lv)較低(di)的(de)(de)(de)開(kai)關式(ON-OFF)的(de)(de)(de)換向(xiang)閥(fa)(fa)(fa)來控(kong)(kong)(kong)制(zhi)氣路的(de)(de)(de)通斷。靠(kao)減壓閥(fa)(fa)(fa)來調節所需(xu)(xu)要(yao)(yao)(yao)(yao)的(de)(de)(de)壓力,靠(kao)節流閥(fa)(fa)(fa)來調節所需(xu)(xu)要(yao)(yao)(yao)(yao)的(de)(de)(de)流量。這種(zhong)傳統(tong)的(de)(de)(de)氣動(dong)控(kong)(kong)(kong)制(zhi)系統(tong)要(yao)(yao)(yao)(yao)想要(yao)(yao)(yao)(yao)有多(duo)個(ge)輸(shu)出(chu)力和多(duo)個(ge)運(yun)動(dong)速(su)度,就需(xu)(xu)要(yao)(yao)(yao)(yao)多(duo)個(ge)減壓閥(fa)(fa)(fa)、節流閥(fa)(fa)(fa)及(ji)換向(xiang)閥(fa)(fa)(fa)。這樣(yang),不僅元件需(xu)(xu)要(yao)(yao)(yao)(yao)多(duo),成(cheng)(cheng)本高,構成(cheng)(cheng)系統(tong)復雜,且許多(duo)元件都(dou)需(xu)(xu)要(yao)(yao)(yao)(yao)預(yu)先進行人(ren)工調節。電氣比例閥(fa)(fa)(fa)控(kong)(kong)(kong)制(zhi)屬于連續(xu)(xu)控(kong)(kong)(kong)制(zhi),其特點是(shi)輸(shu)出(chu)量隨輸(shu)入(ru)量的(de)(de)(de)變化而變化,輸(shu)出(chu)量與(yu)輸(shu)入(ru)量之間存在一(yi)定的(de)(de)(de)比例關系。比例控(kong)(kong)(kong)制(zhi)有開(kai)環控(kong)(kong)(kong)制(zhi)和閉環控(kong)(kong)(kong)制(zhi)之分。 結構(gou)原理 輸(shu)(shu)(shu)入信(xin)號(hao)增大,供氣(qi)用電磁閥(fa)先導閥(fa)1換向,而(er)排氣(qi)用電磁先導閥(fa)7處于(yu)復位(wei)狀態,則供氣(qi)壓力(li)從SUP口通過閥(fa)1進(jin)入先導室(shi)5,先導室(shi)壓力(li)上升,氣(qi)壓力(li)作用在膜片2的(de)(de)上方,則和膜片2相(xiang)連的(de)(de)供氣(qi)閥(fa)芯4便開啟,排氣(qi)閥(fa)芯3關(guan)閉,產生輸(shu)(shu)(shu)出(chu)(chu)壓力(li)。此輸(shu)(shu)(shu)出(chu)(chu)壓力(li)通過壓力(li)傳(chuan)感(gan)(gan)器6反饋至控制回路8。在這里,與(yu)目標值(zhi)進(jin)行快(kuai)速比較修(xiu)正,知道(dao)輸(shu)(shu)(shu)出(chu)(chu)壓力(li)與(yu)輸(shu)(shu)(shu)入信(xin)號(hao)成一(yi)定比例為(wei)止,從而(er)得到(dao)輸(shu)(shu)(shu)出(chu)(chu)壓力(li)與(yu)輸(shu)(shu)(shu)入信(xin)號(hao)的(de)(de)變(bian)化成比例的(de)(de)變(bian)化。由于(yu)沒有噴嘴(zui)擋(dang)板機構,故閥(fa)對雜質(zhi)不敏感(gan)(gan),可靠性高。 特點 1)可實現(xian)(xian)壓力、速度的(de)無(wu)極調節,避免(mian)了常通的(de)開(kai)關式氣(qi)閥(fa)換向時的(de)沖擊(ji)現(xian)(xian)象。 2)能實現遠程(cheng)控制(zhi)和程(cheng)序控制(zhi)。 3)與斷(duan)續控(kong)制相比,系統(tong)簡化,元件(jian)大(da)大(da)減(jian)少。 4)與液(ye)壓(ya)比(bi)例閥相比(bi),體(ti)積小、重量(liang)輕、結構(gou)簡單、成(cheng)本較低,但(dan)響(xiang)應速度比(bi)液(ye)壓(ya)系統慢得多(duo),對負載變化也比(bi)較敏(min)感。 5)使(shi)用功(gong)率小、發熱少、噪聲低。 6)不(bu)會發生火災,*。受(shou)溫度變(bian)化的影響小。 REXROTH力士樂比例閥型號: 4WRP 6 W14S-1X/G24Z4/M 4WRP 6 W28S-1X/G24Z4/M 4WRPH 6 C3 B04L-1X/G24Z4/M 4WRBA 6 E07-2X/G24N9Z4/M 4WRBA 6 W15-2X/G24N9Z4/M-897 4WRBA 6 W07-2X/G24N9Z4/M 4WRP 6 W06S-1X/G24Z4/M 4WRPH 6 C B24L-2X/G24Z4/M-855 4WRPH 6 C B40L-2X/G24Z4/M-855 4WRPH 6 C B40L-2X/G24Z4/M-859 4WRPH 6 C3 B04L-1X/G24Z4/V 4WRPE 6 E18SJ-2X/G24K0/A1M 4WRPE 6 E32SJ-2X/G24K0/A1M 4WRPE 6 W18SJ-2X/G24K0/A1M 4WRPE 6 W32SJ-2X/G24K0/A1M 4WRPE 6 W32SJ-2X/G24K0/B5M 4WRPE 6 W08SJ-2X/G24K0/A1M 4WRPE 6 W18SJ-2X/G24K0/F1M 4WRPE 6 W32SJ-2X/G24K0/F1M 4WRPE 6 E08SJ-2X/G24K0/A1M 4WRPE 6 W2C32SJ-2X/G24K0/A1M-836 4WRBAE 6 E32J-2X/G24N9K31/A1M 4WRBAE 6 E18J-2X/G24N9K31/A1M 4WRBAE 6 W18J-2X/G24N9K31/A1M 4WRBAE 6 E18J-2X/G24N9K31/F1M 4WRBAE 6 W2-32J-2X/G24N9K31/A1M 4WRPH 6 C4 B04L-2X/G24Z4/M 4WRPH 6 C3 B12L-2X/G24Z4/M-561 4WRPH 6 C1 B40P-2X/G24Z4/M 4WRPH 6 XB24L-2X/G24Z4/M-842 4WRPH 6 C3 B24L-2X/G24Z4/M-561 4WRPH 6 XB12L-2X/G24Z4/M-842 4WRPH 6 C4 B24L-2X/G24K0/M-750 4WRPH 6 C3 B24L-2X/G24K0/M-750 4WRPH 6 C3 B40L-2X/G24K0/M-750 4WRPH 6 C4 B40L-2X/G24K0/M-750 4WRPH 6 C B25P-2X/G24Z4/M 4WRPH 6 C3 B40L-2X/G24Z4/M-561 4WRPH 6 XB40L-2X/G24Z4/M-842 4WRPH 6 XB12L-2X/G24K0/M-843 4WRPH 6 C3 B12L-2X/G24K0/M-784 |