4WEH16J7X/6EG24N9ETK4
4WEH16J7X/6EG24N9ETK4 是上海韋米機(jī)電設(shè)備有限公司主營(yíng)產(chǎn)品之一,全國(guó) 何洋,報(bào)價(jià)
4WEH16J7X/6EG24N9ETK4力士樂(lè)液控?fù)Q向閥 德國(guó)力士樂(lè)優(yōu)質(zhì)商品 低價(jià)銷售 *現(xiàn)貨 庫(kù)存清倉(cāng) 全國(guó)聯(lián)保 咨詢
上海韋米機(jī)電設(shè)備有限公司
何洋
我公司專業(yè)代理博世力士樂(lè)(BOSCH-REXROTH)、阿托斯ATOS、派克Parker、迪普馬DUPLOMATIC、油研YUKEN;本特利bentley、貝加萊B&R、西門子、光洋KOYO,美國(guó)ASCO,美國(guó)PARKER派克 等系列進(jìn)口產(chǎn)品
4WEH16J7X/6EG24N9ETK4力士樂(lè)液控?fù)Q向閥 電液閥是由一個(gè)主閥和兩個(gè)電磁閥組成,主閥響應(yīng)速度的控制是兩個(gè)柱塞閥,安裝于主閥的入口和出口。通過(guò)兩個(gè)柱塞閥細(xì)微調(diào)節(jié)主閥的啟閉速度。調(diào)整這些裝置(柱塞閥)以控制流入和流出活塞上方介質(zhì)的流量。達(dá)到主閥啟閉速度能基于介質(zhì)的粘度及壓力調(diào)整的目的。
常開(kāi)(N.O)和常閉(N.C)電磁閥分別安裝在主閥的進(jìn)油回路和出油回路中,用于控制主閥的動(dòng)作,當(dāng)兩電磁閥通電時(shí),進(jìn)油孔(上游閥)回路關(guān)閉,先導(dǎo)孔(下游閥)回路打開(kāi),活塞上腔泄壓,活塞上行,主閥打開(kāi)。反之,活塞下行,主閥關(guān)閉。在主閥開(kāi)啟和關(guān)閉過(guò)程中,可將流量(流速)信號(hào)及閥塞位置信號(hào)傳送給計(jì)算機(jī),經(jīng)過(guò)計(jì)算機(jī)處理后發(fā)出相應(yīng)的指令,控制兩個(gè)電磁導(dǎo)閥的通、斷電狀態(tài),使活塞的上下腔的液壓差產(chǎn)生變化,從而將活塞控制在所需的開(kāi)啟度上,實(shí)現(xiàn)對(duì)管道介質(zhì)流量的控制。
電液比例閥簡(jiǎn)稱比例閥。普通液壓閥只能通過(guò)預(yù)調(diào)的方式對(duì)液流的壓力、流量進(jìn)行定值控制。但是當(dāng)設(shè)備機(jī)構(gòu)在工作過(guò)程中要求對(duì)液壓系統(tǒng)的壓力、流量參數(shù)進(jìn)行調(diào)節(jié)或連續(xù)控制,例如.要求工作臺(tái)在工作進(jìn)給時(shí)按慢、快、慢連續(xù)變化的速度實(shí)現(xiàn)進(jìn)給,或按一定精度模擬某個(gè)*控制曲線實(shí)現(xiàn)旅力控制.普通液壓閥則實(shí)現(xiàn)不了。這時(shí)可以用電液比例閥對(duì)液壓系統(tǒng)進(jìn)行控制。
電液比例閥是一種按輸入的電信號(hào)連續(xù)地、按比例地控制液壓系統(tǒng)的液流方向、流量和壓力的閥類。它山電-機(jī)械比例轉(zhuǎn)換裝置和液壓控制閥本體兩大部分構(gòu)成.前者將輸入的電信號(hào)連續(xù)地按比例地轉(zhuǎn)換為機(jī)械力和位移輸出,后者在接受這種機(jī)械力和位移之后、按比例連續(xù)地輸出壓力和流量.
電液比例閥的發(fā)展主要有兩個(gè)途徑一是用比例電磁鐵取代傳統(tǒng)液壓閥的手動(dòng)調(diào)節(jié)裝置或取代普通電磁鐵發(fā)展起來(lái)的;二是由電液伺服閥簡(jiǎn)化結(jié)構(gòu)、降低精度發(fā)展起來(lái)的。下面介紹的比例閥均指前者,它是當(dāng)今比例閥的主流。與普通液壓閥可以互換。
比例電磁閥的結(jié)構(gòu)如圖5-27所示。比例電磁鐵是直流電磁鐵,但它與普通直流電磁鐵不同。普通直流電磁鐵的銜鐵只有吸合和斷開(kāi)兩個(gè)工作位置,并且在吸合時(shí)磁路中幾乎沒(méi)有氣隙.而比例電磁鐵要求吸合力或位移與給定電流成比例。并在銜鐵的全部工作行程上,磁路中保持一定的氣隙‘.其結(jié)構(gòu)主要由極靴1、線圈2、殼體5和銜鐵10等組成。線圈2中通電后產(chǎn)生磁場(chǎng),因隔磁環(huán)4的存在。使磁力線主要部分通過(guò)銜鐵10、氣隙和極靴1,形成回路口極靴對(duì)銜鐵產(chǎn)生吸力門在線圈中電流一定時(shí)。吸力的大小因極靴1與銜鐵間的距離不同而變化。但銜鐵在氣隙適中的一段行程中,吸力隨位置的改變發(fā)生的變化很小。
設(shè)計(jì)中就使比例電磁鐵的銜鐵在這段行程中工作。因此。改變線圈中的電流,即可在銜鐵上得到與其成正比的吸力。用比例電磁鐵代替螺旋手柄來(lái)調(diào)整液壓閥,就能使輸出樂(lè)力或流量與輸人電流對(duì)應(yīng)成比例地發(fā)生變化。
比例閥用于模擬控制,是介于普通開(kāi)關(guān)控制與伺服控制之間的控制方式,它也特別適合于
設(shè)備的革新或改造。使設(shè)備自動(dòng)化控制水平大為提高。其在現(xiàn)代液雌系統(tǒng)中占比例很大口
與普通液壓閥相比.比例閥的優(yōu)點(diǎn)是①能簡(jiǎn)單地實(shí)現(xiàn)遠(yuǎn)距離控制②能連續(xù)地、按比例地控制液壓系統(tǒng)的壓力和流量。從而實(shí)現(xiàn)對(duì)執(zhí)行機(jī)構(gòu)的位置、速度和力的連續(xù)控制,并能防止或減小壓力、速度變換時(shí)的沖擊;③油路簡(jiǎn)化,元件數(shù)量少。
比例閥適用于既要求能連續(xù)控制脹力、流量.和方向.而又不需要很I的控制精度的場(chǎng)合。
比例閥也分為壓力閥、流量閥和方向閥幾大類。近來(lái)又出現(xiàn)了功能復(fù)合化的趨勢(shì)。
4WEH系列電液換向閥WEH型電液換向閥是電磁閥作為先導(dǎo)控制的滑閥式換向閥,用于控制液流的通段和流動(dòng)方向。-----板式連接。-----直流或交流濕式電磁鐵。-----帶或不帶故障檢查按鈕
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力士樂(lè)REXROTH比例閥,REXROTH閥工作原理
REXROTH力士樂(lè)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(shuō)來(lái),好像伺服系統(tǒng)都是閉環(huán)控制,比例多用于開(kāi)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?kù)`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)!
伺服閥與比例閥的區(qū)別
REXROTH力士樂(lè)比例閥與比例閥之間的差別并沒(méi)有嚴(yán)格的規(guī)定,因?yàn)楸壤y的性能越來(lái)越好,逐漸向伺服閥靠近,所以近些年出現(xiàn)了比例伺服閥。
力士樂(lè)REXROTH比例閥,REXROTH閥工作原理REXROTH力士樂(lè)比例閥非要說(shuō)差別,主要體現(xiàn)在一下幾點(diǎn)
伺服閥中位沒(méi)有死區(qū),比例閥有中位死區(qū);
伺服閥的頻響(響應(yīng)頻率)更高,可以高達(dá)200Hz左右,比例閥一般zui高幾十Hz;
伺服閥對(duì)液壓油液的要求更高,需要精過(guò)濾才行,否則容易堵塞,比例閥要求低一些。
REXROTH力士樂(lè)比例伺服閥性能介于伺服閥和比例閥之間。
REXROTH力士樂(lè)比例換向閥屬于比例閥的一種,用來(lái)控制流量和流向。
力士樂(lè)REXROTH比例閥,REXROTH閥工作原理
力士樂(lè)Rexroth比例閥在使用過(guò)程中,應(yīng)注意對(duì)感載比例閥的檢查調(diào)整.當(dāng)感載彈簧過(guò)松時(shí),后輪制動(dòng)力就會(huì)減小,此時(shí)應(yīng)調(diào)整感載彈簧,但不可調(diào)得過(guò)緊,否則會(huì)使后輪制動(dòng)力太大而失去側(cè)向控制能力,發(fā)生甩尾。正確的調(diào)整方法是.在平坦的地面上使車身落地,車輛空載,調(diào)整感載彈簧,使杠桿與活塞間無(wú)間隙即可.在有條件的情況下,可采用精確的調(diào)整方法.通過(guò)測(cè)量前后輪制動(dòng)管路壓力,繪制壓力分配特性曲線,確認(rèn)調(diào)整是否合格。
德國(guó)Rexroth力士樂(lè)比例閥的工作原理,REXROTH力士樂(lè)比例閥結(jié)構(gòu),力士樂(lè)比例閥作用
REXROTH力士樂(lè)比例閥當(dāng)左側(cè)受力大于右側(cè)受力與感載彈簧預(yù)緊力之和時(shí)(此時(shí)的壓力為Ps),活塞不斷右移,zui后使閥門與閥座接觸而關(guān)閉,將輸入輸出油路隔絕,達(dá)到平衡狀態(tài)。P1若進(jìn)一步升高時(shí),則活塞左移,閥門再度打開(kāi),制動(dòng)液流入出油口,使P2也升高。
德國(guó)rexroth比例閥VT-NE30-2X的輸入壓力為零.即.;時(shí),輸出腔的壓力通過(guò)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(jiàn)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.,1994.№為零時(shí)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),輸入輔出壓力符合即為合格。
Rexroth力士樂(lè)比例閥奧迪四輪驅(qū)動(dòng)轎車制動(dòng)系統(tǒng)在關(guān)閉ABS后,感載比例閥可用于防止后輪的過(guò)制動(dòng)。當(dāng)汽車直線行駛時(shí),兩后輪的制動(dòng)壓力可根據(jù)車輛載荷增減;當(dāng)汽車左轉(zhuǎn)彎時(shí),左后輪載荷下降,由于感載比例閥位于左后輪附近,可同樣起作用使兩后輪的制動(dòng)壓力都下降.而當(dāng)汽車右轉(zhuǎn)彎時(shí),右后輪載荷減小,汽車的側(cè)向加速度使感載比例閥起作用,降低右后輪的制動(dòng)壓力。這樣的自動(dòng)調(diào)節(jié)使前、后輪的制動(dòng)力分配和左、右后輪的制動(dòng)力分配都接近理想的制動(dòng)力分配,從而提高了制動(dòng)安全性。
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R901210524 4WEH 10 HD4X/OF6EG205N9ETS2K4/B10
R901210701 4WEH 10 J4X/6EG205N9ETS2K4/B10
R901210802 4WEH 10 J4X/6EW110N9ES2K4/B10
R901210821 4WEH 10 R4X/6EG24N9ETS2K4/B10
R901211007 4WEH 22 E7X/6EG24N9ESK4/B10
R901211678 H-4WEH 16 G7X/6EW230N9ETS2K4/B10P4,5D3
R901211808 4WEH 16 HD7X/6EG24N9ETS2K4/B10
R901221040 4WEH 10 J4X/6EG24N9EK4/B10
R901223604 H-4WEH 16 Q7X/6EG24N9ES2K4/B10D3
R901223606 H-4WEH 25 J6X/6EG24NES2K4/B10D3
R901223613 H-4WEH 25 HD6X/OF6EG24NES2K4/B10D3
R901223635 4WEH 16 Y7X/6EG24N9K4/B10D3
R901224159 4WEH 22 D7X/6EW230N9ETK4/B10
R901224780 H-4WEH 32 E6X/6EW230N9S2K4/B10D3
R901224981 4WEH 16 JA7X/6EG24N9ETK4/B10
R901225447 4WEH 16 D7X/6EG24N9ETSK4/B10D3
R901225451 4WEH 32 HD6X/OF6EG24N9ETSK4/B10D3
R901225453 H-4WEH 16 HD7X/OF6EG24N9ETSK4/B10D3
R901226047 H-4WEH 25 EA6X/6EG24N9EK4/B10D3
R901233070 4WEH 10 T4X/6EG24N9ETK4/B10
R901234274 4WEH 16 JB7X/6EG24N9EK4/B10
R901235461 4WEH 16 D7X/6EW230N9K4/B15
R901235462 4WEH 16 J7X/6EW230N9K4/B15
R901235463 4WEH 16 J7X/6EG24N9ETK4QMABG24/B10
R978029807 4WEH 16 H7X/6EG24N9ETS2K4/B10P4,5D3
WEH型電液換向閥是用電磁換向閥作為先導(dǎo)控制的滑閥式換向閥, 用于控制液流的通斷和流動(dòng)方向