Rexroth力士樂電磁閥原理：通電時(shí)，電磁力驅(qū)動(dòng)先導(dǎo)閥打開先導(dǎo)閥，主閥上腔壓力迅速下降，在主閥上下腔內(nèi)形成壓差，依靠介質(zhì)壓力推動(dòng)主閥關(guān)閉件上移，閥門開啟；斷電時(shí)，彈簧力把先導(dǎo)閥關(guān)閉，入口介質(zhì)壓力通過先導(dǎo)孔迅速進(jìn)入主閥上腔在上腔內(nèi)形成壓差，從而使主閥關(guān)閉。
特點(diǎn)：體積小，功率低，但介質(zhì)壓差范圍受限，必須滿足壓差條件。
德國(guó)力士樂REXROTH比例閥包括比例流量閥、比例壓力閥、比例換向閥。工程機(jī)械液壓操作特點(diǎn)，以結(jié)構(gòu)形式劃分電液比例閥主要有兩類：一類是螺旋插裝式比例閥（screwin cartridge proportional valve），另一類是滑閥式比例閥（spool proportional valve）。
德國(guó)力士樂REXROTH比例閥是螺紋將電磁比例插裝件固定油路集成塊上元件，螺旋插裝閥具有應(yīng)用靈活、節(jié)省管路和成本低廉等特點(diǎn)，近年來工程機(jī)械上應(yīng)用越來越廣泛。常用螺旋插裝式比例閥有二通、三通、四通和多通等形式，二通式比例閥主比例節(jié)流閥，它常它元件一起構(gòu)成復(fù)合閥，對(duì)流量、壓力進(jìn)行控制；三通式比例閥主比例減壓閥，也是移動(dòng)式機(jī)械液壓系統(tǒng)中應(yīng)用較多比例閥，它主對(duì)液動(dòng)操作多路閥先導(dǎo)油路進(jìn)行操作。利用三通式比例減壓閥可以代替?zhèn)鹘y(tǒng)手動(dòng)減壓式先導(dǎo)閥，它比手動(dòng)先導(dǎo)閥具有更多靈活性和更高控制精度。可以制成如圖1所示比例伺服控制手動(dòng)多路閥，不同輸入信號(hào)，減壓閥使輸出活塞具有不同壓力或流量進(jìn)而實(shí)現(xiàn)對(duì)多路閥閥芯位移進(jìn)行比例控制。四通或多通螺旋插裝式比例閥可以對(duì)工作裝置實(shí)現(xiàn)單獨(dú)控制。
德國(guó)力士樂REXROTH比例閥一種是開關(guān)控制：要么全開、要么全關(guān)，流量要么zui大、要么zui小，沒有中間狀態(tài)，如普通的電磁直通閥、電磁換向閥、電液換向閥。
德國(guó)力士樂REXROTH比例閥另一種是連續(xù)控制：閥口可以根據(jù)需要打開任意一個(gè)開度，由此控制通過流量的大小，這類閥有手動(dòng)控制的，如節(jié)流閥，也有電控的，如比例閥、伺服閥。
REXROTH力士樂比例閥比例閥或伺服閥的目的就是：以電控方式實(shí)現(xiàn)對(duì)流量的節(jié)流控制（當(dāng)然經(jīng)過結(jié)構(gòu)上的改動(dòng)也可實(shí)現(xiàn)壓力控制等），既然是節(jié)流控制，就必然有能量損失，伺服閥和其它閥不同的是，它的能量損失更大一些，因?yàn)樗枰欢ǖ牧髁縼砭S持前置級(jí)控制油路的工作。
德國(guó)力士樂REXROTH比例閥一般來說和換向閥一樣是滑閥結(jié)構(gòu)，只不過閥芯的換向不是靠電磁鐵來推動(dòng)，而是靠前置級(jí)閥輸出的液壓力來推動(dòng)，這一點(diǎn)和電液換向閥比較相似，只不過電液換向閥的前置級(jí)閥是電磁換向閥，而伺服閥的前置級(jí)閥是動(dòng)態(tài)特性比較好的噴嘴擋板閥或射流管閥。
德國(guó)力士樂REXROTH比例閥也就是說，伺服閥的主閥是靠前置級(jí)閥的輸出壓力來控制的，而前置級(jí)閥的壓力則來自于伺服閥的入口p，假如p口的壓力不足，前置級(jí)閥就不能輸出足夠的壓力來推動(dòng)主閥芯動(dòng)作。
德國(guó)力士樂REXROTH比例閥其實(shí)缺點(diǎn)極多：能耗浪費(fèi)大、容易出故障、抗污染能力差、價(jià)格昂貴等等等等，好處只有一個(gè)：動(dòng)態(tài)性能是所有液壓閥中zui高的。就憑著這一個(gè)優(yōu)點(diǎn)，在很多對(duì)動(dòng)態(tài)特性要求高的場(chǎng)合不得不使用伺服閥，如飛機(jī)火箭的舵機(jī)控制、汽輪機(jī)調(diào)速等等。動(dòng)態(tài)要求低一點(diǎn)的，基本上都是比例閥的天下了。一般說來，好像伺服系統(tǒng)都是閉環(huán)控制，比例多用于開環(huán)控制；其次比例閥類型要多，有比例壓力、流量控制閥等，控制比伺服藥靈活一些。從他們內(nèi)部結(jié)構(gòu)看，伺服閥多是零遮蓋，比例閥則有一定的死區(qū)，控制精度要低，向應(yīng)要慢。但從發(fā)展趨勢(shì)看，特別在比例方向流量控制閥和伺服閥方面，兩者性能差別逐漸在縮小，另外比例閥的成本比伺服閥要低許多，抗污染能力也強(qiáng)！
德國(guó)REXROTH力士樂比例閥的輸入壓力為零.即.;時(shí),輸出腔的壓力通過比例閥皮圈凸筋間空酸從唇口泄去高壓,同時(shí),當(dāng)比例閥芯所受的彈簧力大于向右的液壓力時(shí),比例閥彈簧將比例閥芯推回原始位置,使比例閥芯與比例閥皮圈內(nèi)孔*分離而*泄壓.此時(shí)輸入輸出壓力為零.隨著輸入壓力.增大,即左增大,使比例滑閥單向力平衡遭破壞.當(dāng)6-時(shí),比例閥芯左移與比例閥皮圈產(chǎn)生間隙形成節(jié)流并混合比倒閥常見的故障為:1,輸入輸出壓力同步.2,低壓時(shí)輔人輸出壓力同步,高壓時(shí)輸入輸出壓力正常.3,低壓時(shí)輸入輸出壓力正常,高壓時(shí)輸入輸出壓力不正常.,輸入壓力1994.№為零時(shí)（不制動(dòng)時(shí)）,輸出壓力不為零等等.為混合比倒圉工作性能試驗(yàn)示意圖.試驗(yàn)時(shí),先將管內(nèi)的空氣排凈,然后分別取低,中,高三個(gè)壓力進(jìn)行試驗(yàn),輸入輔出壓力符合表1所示即為合格.表混合比例閥試驗(yàn)參數(shù)表單位:表2為混合比例悶常見故障和處理方法.混合比例向在拆卸維修過程中,若污染嚴(yán)重,可用變性酒精清詵,然后烘干后裝配.橡膠件裝配時(shí)表面需涂上清潔的制動(dòng)液,橡膠件不允許被機(jī)油,汽油等污染.表2混合比例閥常見故障和處理故障現(xiàn)象對(duì)制動(dòng)性的膨響常見故障處理方法輸入輸出空載制動(dòng)時(shí)汽車沒有.點(diǎn),比髑閥油封唇口,更換比例悶油封
（1）頭"的感覺.有效制動(dòng)距開裂,破損壓力同步2,正確裝配離加長(zhǎng)2,維修時(shí)裝配錯(cuò)誤低壓時(shí)輸入輸出,比例閥芯（2）事動(dòng)卡,檢查比例悶芯表而是壓力同步,高壓影響不太明顯滯否碰傷2,比例閥皮圈侶1邊過時(shí)正常2更換比倒閥皮圈人低壓時(shí)輸入輸出緊急制動(dòng)時(shí)汽車沒有.點(diǎn)壓力正常,高壓頭"的感覺.有效制動(dòng)距混合閥堵（6）膨脹變形童換混合閥堵麗×如）時(shí)異常離加大.,檢查比倒悶彈簧是否1,比倒閥芯不回位已失效,比仞閥芯小頭表輸入壓力回零時(shí)兩后輪制動(dòng)鼓過熱,后制2,混合比例閥殼體盯肭面是否碰傷動(dòng)蹄早期磨損,油耗增比例閥腔小端盲孔臟堵2,清洗干凈混合比仞闊輸出壓力不回加3,比倒悶皮圈國(guó)）膨脹失殼體效3,更換比例悶皮囤國(guó)）如圖6）制動(dòng)力不夠,制動(dòng)距離過1,檢查進(jìn)出油管接頭輸出壓力低滲漏2,檢查混合悶堵塞火3,檢查比例閻端塞目枷雌。
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