力士樂(lè)比例方向閥4WRKE16E1-200L-35/6EG24ETK31/A1D3M R901004332，德國(guó)REXROTH比例方向閥帶整體放大器，購(gòu)買進(jìn)口液壓、氣動(dòng)、自動(dòng)化控制工業(yè)配件，認(rèn)準(zhǔn)“上海韋米機(jī)電設(shè)備有限公司”，7年老店，保證產(chǎn)品原廠原裝，價(jià)格優(yōu)惠，售后無(wú)憂，歡迎新老客戶咨詢采購(gòu)！
 

比例控制技術(shù)是在開關(guān)控制技術(shù)和伺服控制技術(shù)之間的過(guò)渡技術(shù)，采用比例放大器控制比例電磁鐵，實(shí)現(xiàn)對(duì)比例閥的連續(xù)控制，從而實(shí)現(xiàn)對(duì)液壓系統(tǒng)壓力、流量、方向的無(wú)級(jí)調(diào)節(jié)；但是用比例方向閥進(jìn)行速度控制時(shí)，如果負(fù)載是變化的，那么執(zhí)行元件的速度就會(huì)受負(fù)載變化的影響（負(fù)載小時(shí)速度快，負(fù)載大時(shí)速度慢）；于是在系統(tǒng)設(shè)計(jì)時(shí)，人們引入了壓力補(bǔ)償器，它可以使比例閥閥口的壓差保持恒定，使執(zhí)行元件的速度不受負(fù)載變化的影響。

某鋼廠步進(jìn)梁式加熱爐中步進(jìn)梁升降液壓回路。 此回路使用了比例方向閥與進(jìn)口壓力補(bǔ)償。 由于步進(jìn)梁下降時(shí)，存在超越負(fù)載，所以在油缸無(wú)桿腔設(shè)置了平衡閥。 壓力補(bǔ)償器的彈簧調(diào)定后（這里為定值）,比例閥節(jié)流口的壓差 Δp 就近似為恒定值,即比例方向閥進(jìn)油口前后壓差 Δp 保持恒定值。 當(dāng)節(jié)流口前后壓差保持不變時(shí),通過(guò)節(jié)流口的流量只與節(jié)流口的開口面積成正比。 對(duì)比例方向閥而言, 進(jìn)油節(jié)流口的開口面積與比例方向閥的輸入電流信號(hào)有關(guān),而與負(fù)載的變化無(wú)關(guān)。 亦即升降油缸的供油流量 Q 只與比例方向閥的輸入電流信號(hào)有關(guān),與負(fù)載的變化無(wú)關(guān)。

補(bǔ)償器主要用于節(jié)流調(diào)速系統(tǒng) ，即補(bǔ)償比例閥口的壓差，在定量泵系統(tǒng)中得到了廣泛的應(yīng)用；但這種應(yīng)用不可避免地會(huì)產(chǎn)生一定的溢流損失；如果二通壓力補(bǔ)償器與泵控壓力補(bǔ)償器配合使用，則可以實(shí)現(xiàn)容積節(jié)流調(diào)速。 

變量泵+比例多路閥的形式， 組成了負(fù)載敏感回路；除每一聯(lián)多路閥都設(shè)有進(jìn)口壓力補(bǔ)償器外；變量泵還配有泵控壓力補(bǔ)償器；此補(bǔ)償器與反饋油路配合可實(shí)現(xiàn)負(fù)載敏感控制， 使此回路不僅降低了比例閥閥口的節(jié)流損失，也將液壓系統(tǒng)的溢流損失降到低。

液壓比例控制系統(tǒng)
以比例控制元件完成動(dòng)力與運(yùn)動(dòng)方向控制，分為比例壓力閥、比例流量閥、比例方向閥及比例方向流量閥，可為模擬量輸入或數(shù)字量輸入，視是否帶反饋分為開環(huán)控制與閉環(huán)控制，一般獲得頻率不是很高(10HZ)以內(nèi)，高頻響閥可實(shí)現(xiàn)較高頻率。
若精度要求不高可考慮使用電液比例控制系統(tǒng)，一般電液比例控制系統(tǒng)可達(dá)至以下精度
位置精度- 3 mm
速度精度帶壓力補(bǔ)償器- 3%
加減速斜坡時(shí)間-0.5秒
壓力帶位移傳感器的產(chǎn)品-比例壓力閥設(shè)定的0.3% (如壓力設(shè)定為200bar,精度可達(dá)0.6bar)
一般的多驅(qū)動(dòng)器液壓系統(tǒng)皆要求流量及壓力控制，提供比例壓力及流量控制系統(tǒng)
開環(huán)式比例壓力及流量控制可用于定量泵及變量泵系統(tǒng)。
速度和流量比例控制的分別是:
流量控制只控制供油量,并不控制驅(qū)動(dòng)元件的運(yùn)動(dòng)方向;
若系統(tǒng)負(fù)載及變速要求高，則要使用速度控制系統(tǒng)。
速度比例控制多用于自動(dòng)化控制、注塑機(jī)、壓力機(jī)等
使用閉環(huán)的主要原因:
保持設(shè)定值不受外來(lái)干擾所影響
→在不同的工作壓力下保持穩(wěn)定的速度
→在不同的輸出力下保證相同位置
→在帶偏載的情況下作同步移動(dòng)
提高精度要求
→位置誤差低于1 mm
→壓力誤差低于1 ba
→需要控制加減速度
高動(dòng)態(tài)要求的系統(tǒng)
→模擬應(yīng)用
→測(cè)驗(yàn)應(yīng)用


液壓伺服控制系統(tǒng)
以伺服控制元件完成動(dòng)力與運(yùn)動(dòng)方向控制，綜合壓力、流量、方向控制為一體，利用偏差控制進(jìn)行糾偏，以滿足精度控制需要，必須為閉環(huán)控制，可實(shí)現(xiàn)較高頻率( 100HZ以上) ,有滑閥式、噴嘴擋板式、射流管式等，常采用機(jī)械伺服、電液伺服、氣液伺服。
力士樂(lè)比例方向閥4WRKE16E1-200L-35/6EG24ETK31/A1D3M R901004332
力士樂(lè)REXROTH比例方向閥，先導(dǎo)式，帶整體電子放大版（OBE）和電氣位置反饋4WRKE
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上海韋米機(jī)電設(shè)備有限公司位于上海市浦東新區(qū)金橋禹洲國(guó)際，是一家從事經(jīng)營(yíng)國(guó)外進(jìn)口液壓氣動(dòng)備件、自動(dòng)化儀表的貿(mào)易型公司；專注于中國(guó)工業(yè)傳動(dòng)自動(dòng)化流體領(lǐng)域。公司本著誠(chéng)信為本、服務(wù)至上的理念。堅(jiān)決維護(hù)客戶利益，保障所屬品牌原裝產(chǎn)品，為客戶提供優(yōu)惠的價(jià)格，優(yōu)質(zhì)的產(chǎn)品及售后，實(shí)現(xiàn)合作雙贏，打造良好貿(mào)易合作伙伴關(guān)系。主營(yíng)產(chǎn)品電磁閥、比例閥、柱塞泵、壓力繼電器，壓力傳感器，伺服驅(qū)動(dòng)器、伺服電機(jī)、可編程控制器、PLC模塊、I/O模塊、傳感器、氣缸、氣動(dòng)閥，壓縮空氣處理單元、工業(yè)儀器儀表等。經(jīng)營(yíng)品牌有：博世力士樂(lè)REXROTH、安沃馳AVENTICS、阿托斯ATOS、迪普馬DUPLOMATIC、貝加萊B&R、本特利Bently、愛爾泰克AIRTEC、世格ASCO、穆格MOOG、PARKER派克、EATON VICKERS伊頓威格士、西門子Siemens等進(jìn)口品牌。 
我們熱誠(chéng)歡迎各界朋友咨詢、實(shí)地考察、洽談業(yè)務(wù)。

液壓系統(tǒng)的組成及其作用
一個(gè)完整的液壓系統(tǒng)由五個(gè)部分組成，即動(dòng)力元件、執(zhí)行元件、控制元件、輔助元件(附件)和液壓油。
動(dòng)力元件的作用是將原動(dòng)機(jī)的機(jī)械能轉(zhuǎn)換成液體的壓力能，指液壓系統(tǒng)中的油泵，它向整個(gè)液壓系統(tǒng)提供動(dòng)力。液壓泵的結(jié)構(gòu)形式一般有齒輪泵、葉片泵和柱塞泵。
執(zhí)行元件(如液壓缸和液壓馬達(dá))的作用是將液體的壓力能轉(zhuǎn)換為機(jī)械能，驅(qū)動(dòng)負(fù)載作直線往復(fù)運(yùn)動(dòng)或回轉(zhuǎn)運(yùn)動(dòng)。
控制元件(即各種液壓閥)在液壓系統(tǒng)中控制和調(diào)節(jié)液體的壓力、流量和方向。根據(jù)控制功能的不同，液壓閥可分為村力控制閥、流量控制閥和方向控制閥。壓力控制閥又分為益流閥(安全閥)、誠(chéng)壓閥、順序閥、壓力繼電器等;流量控制閥包括節(jié)流閥、調(diào)整閥、分流集流閥等，方向控制閥包括單向閥、液控單向閥、梭閥、換向閥等。根據(jù)控制方式不同，液壓閥可分為開關(guān)式控制閥、定值控制閥和比例控制閥。
輔助元件包括油箱、濾油器、油管及管接頭、密封圈、快換接頭、高壓球閥、膠管總成、測(cè)壓接頭、壓力表、油位油溫計(jì)等。
液壓油是液壓系統(tǒng)中傳遞能量的工作介質(zhì)，有各種礦物油、乳化液和合成型液壓油等幾大類。

液壓系統(tǒng)結(jié)構(gòu)
液壓系統(tǒng)由信號(hào)控制和液壓動(dòng)力兩部分組成，信號(hào)控制部分用于驅(qū)動(dòng)液壓動(dòng)力部分中的控制閥動(dòng)作。
液壓動(dòng)力部分采用回路圖方式表示，以表明不同功能元件之間的相互關(guān)系。液壓源含有液壓泵、電動(dòng)機(jī)和液壓輔助元件;液壓控制部分含有各種控制閥，其用于控制工作油液的流量、壓力和方向;執(zhí)行部分含有液壓缸或液壓馬達(dá)，其可按實(shí)際要求來(lái)選擇。
在分析和設(shè)計(jì)實(shí)際任務(wù)時(shí)，一般采用方框圖顯示設(shè)備中實(shí)際運(yùn)行狀況。空心箭頭表示信號(hào)流，而實(shí)心箭頭則表示能量流。
基本液壓回路中的動(dòng)作順序一控制元件(二位四通換向閥)的換向和彈簧復(fù)位、執(zhí)行元件(雙作用液壓缸)的伸出和回縮以及溢流閥的開啟和關(guān)閉。對(duì) 于執(zhí)行元件和控制元件，演示文稿都是基于相應(yīng)回路圖符號(hào)，這也為介紹回路圖符號(hào)作了準(zhǔn)備。
根據(jù)系統(tǒng)工作原理，您可對(duì)所有回路依次進(jìn)行編號(hào)。如果一個(gè)執(zhí)行元件編號(hào)為0，則與其相關(guān)的控制元件標(biāo)識(shí)符則為1。如果與執(zhí)行元件伸出相對(duì)應(yīng)的元件標(biāo)識(shí)符為偶數(shù)，則與執(zhí)行元件回縮相對(duì)應(yīng)的元件標(biāo)識(shí)符則為奇數(shù)。不僅應(yīng)對(duì)液壓回路進(jìn)行編號(hào)，也應(yīng)對(duì)實(shí)際設(shè)備進(jìn)行編號(hào)，以便發(fā)現(xiàn)系統(tǒng)故障。
DIN ISO1219-2 標(biāo)準(zhǔn)定義了元件的編號(hào)組成，其包括下面四個(gè)部分，設(shè)備編號(hào)、回路編號(hào)、元件標(biāo)識(shí)符和元件編號(hào)。如果整個(gè)系統(tǒng)僅有一種設(shè)備，則可省略設(shè)備編號(hào)。
實(shí)際中，另一種編號(hào)方式就是對(duì)液壓系統(tǒng)中所有元件進(jìn)行連續(xù)編號(hào)，此時(shí)，元件編號(hào)應(yīng)該與元件列表中編號(hào)相一致。這種方法特別適用于復(fù)雜液壓控制系統(tǒng)，每個(gè)控制回路都與其系統(tǒng)編號(hào)相對(duì)應(yīng)。

液壓或氣動(dòng)技術(shù)在工業(yè)中的應(yīng)用
液壓傳動(dòng)和氣壓傳動(dòng)統(tǒng)稱為流體傳動(dòng)，是根據(jù)17世紀(jì)帕斯卡提出的液體靜壓力傳動(dòng)原理，利用液體與氣體來(lái)傳遞能量的一門新興技術(shù)，是工農(nóng)業(yè)生產(chǎn)中廣為應(yīng)用的一門技術(shù)。液壓技術(shù)*初用水作為工作介質(zhì)，以水壓機(jī)的形式將其應(yīng)用于工業(yè)上，后來(lái)隨著技術(shù)的逐步進(jìn)步，介質(zhì)改為油，至今大部分的液壓機(jī)械仍然是使用油作為介質(zhì)，但制造出來(lái)的產(chǎn)品無(wú)論在性能、范圍、用途等各方面都是以往的技術(shù)所不能比及的。經(jīng)過(guò)二百多年的發(fā)展，到如今，流體與氣體傳動(dòng)技術(shù)水平的高低已成為一個(gè)國(guó)家工業(yè)發(fā)展水平的重要標(biāo)志。液壓與氣動(dòng)技術(shù)開始大范圍的應(yīng)用是在二十世紀(jì)，特別是1920年以后，發(fā)展更為迅速。液壓元件大約在19世紀(jì)術(shù)20世紀(jì)初的20年間，才開始進(jìn)入正規(guī)的工業(yè)生產(chǎn)階段。1925年維克斯發(fā)明了壓力平衡式葉片泵，為近代液壓元件工業(yè)或液壓傳動(dòng)標(biāo)準(zhǔn)的逐步建立奠定了基礎(chǔ)。20世紀(jì)初康斯坦丁尼斯克對(duì)能量波動(dòng)傳遞進(jìn)行了理論及實(shí)際研究。
液壓技術(shù)一般應(yīng)用于重型、大型、特大型設(shè)備，如冶金行業(yè)軋機(jī)壓下系統(tǒng)，連鑄機(jī)壓下系統(tǒng)等;高速響應(yīng)隨動(dòng)系統(tǒng)等工程機(jī)械，抗沖擊，要求功重比較高系統(tǒng)一般都采用液壓系統(tǒng)，這是應(yīng)用液壓技術(shù)的三個(gè)領(lǐng)域。

液壓傳動(dòng)基本原理
從原理上來(lái)說(shuō)，液壓傳動(dòng)所基于的基本的原理就是帕斯卡原理，就是說(shuō)，液體各處的壓強(qiáng)是一致的，這樣，在平衡的系統(tǒng)中，比較小的活塞上面施加的壓力比較小，而大的活塞上施加的壓力也比較大，這樣能夠保持液體的靜止。所以通過(guò)液體的傳遞，可以得到不同端上的不同的壓力，這樣就可以達(dá)到一個(gè)變換的目的。我們所常見到的液壓千斤頂就是利用了這個(gè)原理來(lái)達(dá)到力的傳遞。液壓傳動(dòng)中所需要的元件主要有動(dòng)力元件、執(zhí)行元件、控制元件、輔助元件等。其中液壓動(dòng)力元件是為液壓系統(tǒng)產(chǎn)生動(dòng)力的部件，主要包括各種液壓泵。液壓泵依靠容積變化原理來(lái)工作，所以一般也稱為容積液壓泵。齒輪泵是常見的一-種液壓泵，它通過(guò)兩個(gè)嚙合的齒輪的轉(zhuǎn)動(dòng)使得液體進(jìn)行運(yùn)動(dòng)。其他的液壓泵還有葉片泵、柱塞泵，在選擇液壓泵的時(shí)候主要需要注意的問(wèn)題包括消耗的能量、效率、降低噪音。液壓執(zhí)行元件是用來(lái)執(zhí)行將液壓泵提供的液壓能轉(zhuǎn)變成機(jī)械能的裝置，主要包括液壓缸和液壓馬達(dá)。液壓馬達(dá)是與液壓泵做相反的工作的裝置，也就是把液壓的能量轉(zhuǎn)換稱為機(jī)械能，從而對(duì)外做功。液壓控制元件用來(lái)控制液體流動(dòng)的方向、壓力的高低以及對(duì)流量的大小進(jìn)行預(yù)期的控制，以滿足特定的工作要求。正是因?yàn)橐簤嚎刂圃�器件的靈活性,使得液壓控制系統(tǒng)能夠完成不同的活動(dòng)。液壓控制元件按照用途可以分成壓力控制閥、流量控制閥、方向控制閥。按照操作方式可以分成人力操縱閥、機(jī)械操縱法、電動(dòng)操縱閥等。除了上述的元件以外，液壓控制系統(tǒng)還需要液壓輔助元件。這些元件包括管路和管接頭、油箱、過(guò)濾器.蓄能器和密封裝置。通過(guò)以上的各個(gè)器件，我們就能夠建設(shè)出一個(gè)液壓回路。所謂液壓回路就是通過(guò)各種液壓器件構(gòu)成的相應(yīng)的控制回路。根據(jù)不同的控制目標(biāo)，我們能夠設(shè)計(jì)不同的回路，比如壓力控制回路、速度控制回路、多缸工作控制回路等。根據(jù)液壓傳動(dòng)的結(jié)構(gòu)及其特點(diǎn)，在液壓系統(tǒng)的設(shè)計(jì)中，首先要進(jìn)行系統(tǒng)分析，然后擬定系統(tǒng)的原理圖，其中這個(gè)原理圖是用液壓機(jī)械符號(hào)來(lái)表示的。
之后通過(guò)計(jì)算選擇液壓器件，進(jìn)而再完成系統(tǒng)的設(shè)計(jì)和調(diào)試。這個(gè)過(guò)程中，原理圖的繪制是關(guān)鍵的。它決定了一個(gè)設(shè)計(jì)系統(tǒng)的優(yōu)劣。液壓傳動(dòng)的應(yīng)用性是很強(qiáng)的，比如裝卸堆碼機(jī)液壓系統(tǒng)，它作為一種倉(cāng)儲(chǔ)機(jī)械，在現(xiàn)代化的倉(cāng)庫(kù)里利用它實(shí)現(xiàn)紡織品包、油桶、木桶等貨物的裝卸機(jī)械化工作。也可以應(yīng)用在萬(wàn)能外圓磨床液壓系統(tǒng)等生產(chǎn)實(shí)踐中。這些系統(tǒng)的特點(diǎn)是功率比較大，生產(chǎn)的效率比較高，平穩(wěn)性比較好。