ATOS比例閥的區別伺服閥與比例閥之間的差別并沒有嚴格的規定,因為比例閥的性能越來越好,逐漸向伺服閥靠近,所以近些年出現了比例伺服閥。 比例閥和伺服閥的區別主要體現在以下幾點: 1.驅動裝置不同。比例閥的驅動裝置是比例電磁鐵;伺服閥的驅動裝置是力馬達或力矩馬達; 2.性能參數不同。滯環、中位死區、頻寬、過濾精度等特性不同,因此應用場合不同,伺服閥和伺服比例閥主要應用在閉環控制系統,其它結構的比例閥主要應用在開環控系統及閉環速度控制系統; 2.1 伺服閥中位沒有死區,比例閥有中位死區; 2.2 伺服閥的頻響(響應頻率)更高,可以高達200Hz左右,比例閥一般zui高幾十Hz; 2.3 伺服閥對液壓油液的要求更高,需要精過濾才行,否則容易堵塞,比例閥要求低一些; 3.閥芯結構及加工精度不同。比例閥采用閥芯+閥體結構,閥體兼作閥套。伺服閥和伺服比例閥采用閥芯+閥套的結構。 4.中位機能種類不同。比例換向閥具有與普通換向閥相似的中位機能,而伺服閥中位機能只有O型(Rexroth產品的E型)。 5.閥的額定壓降不同。 意大利ATOS比例閥型(xing)號表: LIMZA-A-1/180/M 20 LIMZA-A-3/180/M 40 LIMZO-A-3/210 LIMZO-A-4/210 LIMZO-A-5/315/P 30 LIMZO-AE-4/315 10 LIMZO-TER-4/210 50 LIMZO-TER-4/210/I LIQV-2 20 LIQV-2/K LIQZO-A-252S4 LIQZO-L-252L4 50 LIQZO-L-322L4 50 LIQZO-LE-402L4 50 LIQZO-LE-502L4 50 LIQZO-LE-632L4 51 LIQZO-T-252L4 LIQZO-T-252L4 50 /PE LIQZO-T-322L4 50 LIQZO-T-402L4 LIQZO-TE-322L4 50 LIRA-1/100 20 LIRA-1/210 20 LIRA-2/210/V 20 LIRA-3/100 LIRA-4/210/V 11 LIRZO-A-1/210 QVHZO-A-06/12 20 QVHZO-A-06/18 QVHZO-A-06/3 QVHZO-A-06/36 QVHZO-A-06/45 QVHZO-AE-06/3/I 10 QVHZO-AE-06/45/I QVHZO-T-06/12 31 QVHZO-T-06/3 31/WG QVHZO-TE-06/18 40 QVHZO-TE-06/18/I 40 QVHZO-TE-06/3 40 QVKMZOR-A-10/90/210/18 QVKZOR-A-10/65 QVKZOR-AE-10/90 10 QVKZOR-AES-BC-10/65 10? ATOS比(bi)例(li)閥對流(liu)(liu)量(liang)(liang)(liang)的控(kong)(kong)(kong)制(zhi)(zhi)(zhi)可(ke)以分為(wei)兩種:一種是(shi)(shi)開(kai)(kai)(kai)關(guan)控(kong)(kong)(kong)制(zhi)(zhi)(zhi):要(yao)(yao)么(me)全開(kai)(kai)(kai)、要(yao)(yao)么(me)全關(guan),流(liu)(liu)量(liang)(liang)(liang)要(yao)(yao)么(me)zui大、要(yao)(yao)么(me)zui小(xiao),沒有中間(jian)狀(zhuang)態,如普通(tong)的電(dian)(dian)磁直通(tong)閥、電(dian)(dian)磁換向閥、電(dian)(dian)液(ye)換向閥。另一種是(shi)(shi)連續控(kong)(kong)(kong)制(zhi)(zhi)(zhi):閥口可(ke)以根據需要(yao)(yao)打開(kai)(kai)(kai)任意一個(ge)開(kai)(kai)(kai)度,由此控(kong)(kong)(kong)制(zhi)(zhi)(zhi)通(tong)過流(liu)(liu)量(liang)(liang)(liang)的大小(xiao),這類閥有手動控(kong)(kong)(kong)制(zhi)(zhi)(zhi)的,如節流(liu)(liu)閥,也有電(dian)(dian)控(kong)(kong)(kong)的,如比(bi)例(li)閥、伺服閥。所以使用比(bi)例(li)閥或伺服閥的目的就是(shi)(shi):以電(dian)(dian)控(kong)(kong)(kong)方式實現對流(liu)(liu)量(liang)(liang)(liang)的節流(liu)(liu)控(kong)(kong)(kong)制(zhi)(zhi)(zhi)(當然(ran)經過結構上的改動也可(ke)實現壓力控(kong)(kong)(kong)制(zhi)(zhi)(zhi)等),既然(ran)是(shi)(shi)節流(liu)(liu)控(kong)(kong)(kong)制(zhi)(zhi)(zhi),就必然(ran)有能量(liang)(liang)(liang)損失(shi)(shi),伺服閥和其它閥不同的是(shi)(shi),它的能量(liang)(liang)(liang)損失(shi)(shi)更大一些(xie),因(yin)為(wei)它需要(yao)(yao)一定的流(liu)(liu)量(liang)(liang)(liang)來維持前置(zhi)級(ji)控(kong)(kong)(kong)制(zhi)(zhi)(zhi)油(you)路的工作。 |