力士樂(lè)控制閥塊R901261927 M7-1940-30/7M7-25，德國(guó)REXROTH控制閥塊，購(gòu)買(mǎi)進(jìn)口液壓、氣動(dòng)、自動(dòng)化控制工業(yè)配件，
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行走機(jī)械是指能夠行走的工程機(jī)械、農(nóng)業(yè)機(jī)械、礦山機(jī)械和專(zhuān)用車(chē)輛，如推土機(jī)、挖掘機(jī)、壓路機(jī)、攤鋪機(jī)、起重機(jī)、叉車(chē)、裝載機(jī)、拖拉機(jī)、聯(lián)合收割機(jī)等。特別是工程機(jī)械，可以稱(chēng)之為行走機(jī)械的代表。
行走機(jī)械一般由發(fā)動(dòng)機(jī)、底盤(pán)和工作裝置三部分組成。而發(fā)動(dòng)機(jī)、傳動(dòng)系統(tǒng)和液壓系統(tǒng)是行走機(jī)械的關(guān)鍵部件，如液壓系統(tǒng)中的高壓柱塞泵/馬達(dá)、液壓閥、液力變速器和液壓電子控制器等。
對(duì)于行走機(jī)械關(guān)鍵技術(shù)的研究，主要集中在發(fā)動(dòng)機(jī)燃料燃燒與電控、液壓控制系統(tǒng)、自動(dòng)操縱、可視化駕駛、精確定位與作業(yè)、故障診斷與監(jiān)測(cè)、節(jié)能與環(huán)保等方面。
LUDV系統(tǒng)是力士樂(lè)等公司在改進(jìn)負(fù)荷傳感技術(shù)的基礎(chǔ)，上發(fā)展起來(lái)的，它是不受負(fù)載影響的流量分配系統(tǒng),它將常開(kāi)式壓力補(bǔ)償閥改為常閉式,泵所提供的流量與負(fù)載所需相匹配,避免了不必要的空流和節(jié)流損失。即使泵的流量小于系統(tǒng)復(fù)合動(dòng)作所需的流量,各動(dòng)作的相對(duì)速度也不會(huì)發(fā)生變化,從而保證動(dòng)作的協(xié)調(diào)性,避免動(dòng)作沖擊。
力士樂(lè)挖掘機(jī)液壓系統(tǒng)可以看作由以下4部分組成:
1.多路閥液壓系統(tǒng)(主油路)；
2.液壓泵控制液壓系統(tǒng)(包括與發(fā)動(dòng)機(jī)綜合控制)；
3.各液壓作用元件液壓子系統(tǒng)，包括動(dòng)臂、斗桿、鏟斗、回轉(zhuǎn)和行走液壓系統(tǒng)，還包括附屬裝置液壓系統(tǒng)；
4.多路閥操縱和控制液壓系統(tǒng)。
多路閥液壓系統(tǒng)是液壓挖掘機(jī)的主油路，它確定了液壓泵如何向.各液壓作用元件的供油方式，決定了液壓挖掘機(jī)的工作特性。力士樂(lè)采用的閉中位負(fù)載敏感壓力補(bǔ)償多路閥液壓系統(tǒng)。挖掘機(jī)力士樂(lè)主油路由工裝油路和回轉(zhuǎn)油路二個(gè)負(fù)載敏感壓力補(bǔ)償系統(tǒng)組成。
工裝油路
工作裝置和行走油路(除回轉(zhuǎn)外)簡(jiǎn)稱(chēng)工裝油路,用閥后補(bǔ)償分流比負(fù)載敏感壓力補(bǔ)償(LUDV)系統(tǒng)，具有抗飽和功能。在每個(gè)操縱閥閥桿節(jié)流口后，設(shè)壓力補(bǔ)償閥，然后通過(guò)方向閥向各液壓作用元件供油。
LUDV每個(gè)閥塊主要由操縱閥和壓力補(bǔ)償閥組成，為了便于理解閥的原理，把操縱閥進(jìn)行分解后可知，它實(shí)際上由閥的節(jié)流部分和閥的換向部分兩部分組成。閥塊原理壓力油進(jìn)入操縱閥先通過(guò)閥節(jié)流部分，后經(jīng)壓力補(bǔ)償閥，后通過(guò)閥換向部分去液壓作用元件。閥后補(bǔ)償壓力補(bǔ)償閥布置在操縱閥可變節(jié)流口之后，由于液壓作用元件一般都是雙作用，有A、B兩條油路，為了避免兩條油路都設(shè)壓力補(bǔ)償閥，因此油路換向部分必須設(shè)在壓力補(bǔ)償閥之后。為了簡(jiǎn)化閥的結(jié)構(gòu)，把節(jié)流部分和換向部分集成于一體(操縱閥中)，工作裝置和行走操縱閥雖基本相同，但中位油路連通有所區(qū)別。工作裝置操縱閥中位A、B油口封閉，行走操縱閥.中位A、B油口與回油路通過(guò)節(jié)流相通。對(duì)壓力補(bǔ)償閥取力平衡得: Pml =PLmax = Pm2。即壓力補(bǔ)償閥進(jìn)口壓力都相等，故經(jīng)各操縱閥的壓差都相等(△P1 = OP2 = OP = PP- PLmax) ,則通過(guò)各操縱閥的流量Q=kAP,只與反映閥桿行程(開(kāi)口量)的k有關(guān)，具有抗飽和的功能。負(fù)荷低的壓力補(bǔ)償閥產(chǎn)生壓力降:△PC =PLmax - PL2 (設(shè)PL1 = PLmax) ,此壓降正好補(bǔ)償負(fù)荷壓力差，因此壓力補(bǔ)償閥實(shí)際上起了負(fù)荷均衡器的作用。多路閥液壓系統(tǒng)工作原理圖1中，檢出負(fù)載壓力PLmax采用的是梭閥網(wǎng)，而實(shí)際液壓系統(tǒng)中，工裝和行走油路不采用梭閥網(wǎng)，而是采用三位三通的壓力補(bǔ)償閥來(lái)檢出負(fù)載壓力作為補(bǔ)償壓力。
回轉(zhuǎn)油路；力士樂(lè)把回轉(zhuǎn)獨(dú)立出來(lái)，采用閥前補(bǔ)償(減壓閥型壓力補(bǔ)償閥)負(fù)載敏感壓力補(bǔ)償油路。它與工作裝置油路并聯(lián)。回轉(zhuǎn)負(fù)載油壓通過(guò)單向閥與油泵負(fù)載敏感腔相通。當(dāng)工作裝置油路中各液壓元件單獨(dú)動(dòng)作或同時(shí)動(dòng)作時(shí)，就如同單泵閥后補(bǔ)償分流比負(fù)載敏感壓力補(bǔ)償系統(tǒng)一樣，油泵單獨(dú)供該系統(tǒng)。當(dāng)回轉(zhuǎn)單獨(dú)動(dòng)作時(shí)，為閥前補(bǔ)償負(fù)載敏感系統(tǒng)。回轉(zhuǎn)油路和工裝油路同時(shí)動(dòng)作情況:當(dāng)工裝油路高負(fù)載壓力高于回轉(zhuǎn)油路時(shí)，工裝油壓由于受單向閥阻隔，傳不到回轉(zhuǎn)油路，由于兩油路是并聯(lián)系統(tǒng)，油優(yōu)先流向負(fù)載壓力低的回轉(zhuǎn)油路;當(dāng)工裝油路高負(fù)載壓力低于回轉(zhuǎn)油路時(shí)，回轉(zhuǎn)油壓PC通過(guò)單向閥傳至工裝油路負(fù)載壓力補(bǔ)償，工裝和回轉(zhuǎn)負(fù)載壓力均衡平衡相等，按各自操縱閥的開(kāi)度大小向各執(zhí)行器分配供油。
液壓泵控制系統(tǒng)
力士樂(lè)挖掘機(jī)液壓泵控制系統(tǒng)有不同的配置,具有不同的控制功能。
恒功率閥和杠桿式恒功率裝置
恒功率閥是二位三通閥。在彈簧力作用下，恒功率閥處于右位,下油缸壓力油通過(guò)恒功率閥回油，在上油缸腔內(nèi)油壓和彈簧作用下油泵向大流量方向擺動(dòng)。油泵壓力油通過(guò)上油缸腔作用在頂桿上，頂桿頂推杠桿使杠桿繞支點(diǎn)擺動(dòng)，推動(dòng)A閥向右移動(dòng)，使恒功率閥處于左位，油泵壓力油通過(guò)恒功率閥經(jīng)閥進(jìn)入下油缸，推動(dòng)其活塞桿，克服上油缸液壓力并壓縮彈簧使油泵向小流量方向擺動(dòng)。同時(shí)由于上油缸活塞桿右移，頂.桿頂推杠桿的力臂減小，使杠桿推A閥的力下降，直至與A閥彈簧力相等，油泵擺角處于新的平衡位置。
這種恒功率裝置通過(guò)杠桿機(jī)構(gòu)來(lái)實(shí)現(xiàn)，只要杠桿系統(tǒng)設(shè)計(jì)得好，就能實(shí)現(xiàn)很理想的恒功率曲線。
油泵流量調(diào)節(jié)閥為二位三通閥，閥的左端受泵的出口油壓Pp作用，閥的右端受多路閥負(fù)載敏感腔的油壓PLmax和彈簀力FS2作用，此閥的作用是設(shè)定系統(tǒng)的補(bǔ)償壓力。流量調(diào)節(jié)閥的作用是使系統(tǒng)壓差OP ( P -PLmax) 保持定值。OP由設(shè)計(jì)確定稱(chēng)為系統(tǒng)的補(bǔ)償壓差，是系統(tǒng)各操縱閥的進(jìn)口壓加P與出口壓力Pm ( = PLmax) 之差，各操縱閥在保持補(bǔ)償壓差一定條件下，通過(guò)改變閥桿的開(kāi)口面積來(lái)控制去各液壓作用元件的流量。系統(tǒng)通過(guò)油泵流量調(diào)節(jié)，按司機(jī)操縱閥桿的開(kāi)度大小，提供所需流量，而且只供給比負(fù)載稍高一點(diǎn)(△P)的油壓。避免了系統(tǒng)的流量損失和過(guò)大的壓力損失。當(dāng)彈簧力和閥的受壓面積在設(shè)計(jì)時(shí)取定后，LRS 油泵控制系統(tǒng)是不變的，因此恒功率閥設(shè)定功率是不變的。油泵流量調(diào)節(jié)閥設(shè)定的補(bǔ)償壓力也是不變的，雖然可以停機(jī)通過(guò)調(diào)整彈簧來(lái)改變功率設(shè)定和補(bǔ)償壓力設(shè)定，但顯然是不方便和不理想的，但實(shí)際挖掘機(jī)工作中需要改變功率和改變補(bǔ)償壓力，這是LRS 系統(tǒng)的不足之處。
力士樂(lè)控制閥塊R901261927 M7-1940-30/7M7-25
力士樂(lè)行走機(jī)械液壓-移動(dòng)控制-控制塊M7-1
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R900702848 M7-1354-30/1M7-22
R900706432 M7-1355-20/7M7-20
R900704353 M7-1359-20=5M7-20G
R900706455 M7-1361-30/8M7-22
R900708187 M7-1362-10/3M7-22_
R900713786 M7-1363-20/8M7-20
R900762330 M7-1366-31/7M7-22
R900711319 M7-1369-30/3M7-22
R900711702 M7-1370-30=5M7-22G=CT
R900718989 M7-1371-30/7M7-22
R900719539 M7-1372-20/6M7-20
R900720598 M7-1373-30/4M7-22
R900721249 M7-1374-30=5M7-22G
R900721676 M7-1376-30/4M7-22
R900721679 M7-1377-30/4M7-22
R900722305 M7-1378-30/3M7-22
R900722781 M7-1379-30/3M7-22W=TA
R900722783 M7-1380-30/4M7-22W
R900727421 M7-1382-20/7M7-22
R900728157 M7-1384-30/5M7-22
R900728158 M7-1385-30/6M7-22
R901112918 M7-1385-31/6M7-22
R901111276 M7-1385-32/6M7-22
R901133437 M7-1385-33/6M7-22
R900770026 M7-1386-32/6M7-22
R901111279 M7-1386-33/6M7-22
R901133445 M7-1386-34/6M7-22
R900728249 M7-1388-20/5M7-22
R900730754 M7-1389-30=1M7-22
R900730755 M7-1390-30/2M7-22
R900731103 M7-1391-30/5M7-22
R900731671 M7-1392-21/7M7-20
R900731674 M7-1393-21/8M7-20
R900744256 M7-1394-30/8M7-22
R900735148 M7-1395-30/8M7-22
R900736568 M7-1396-21/7M7-20
R900736569 M7-1397-21/8M7-20
R900736570 M7-1398-20/7M7-20
R900736571 M7-1399-20/8M7-20
R900736631 M7-1400-30/3M7-22
R900736632 M7-1401-30/3M7-22
R900737095 M7-1402-20/6M7-20
R900737266 M7-1404-30/4M7-22W21
R900737430 M7-1405-30/8M7-22
R900737859 M7-1406-20/5M7-20H
R900740186 M7-1408-20/5M7-22
R901039252 M7-1408-21/5M7-22
R900741115 M7-1409-30/4M7-22H
R900741117 M7-1410-30/4M7-22H
R900742209 M7-1411-20/5M7-22
R900742986 M7-1413-20=5M7-20G
R900742988 M7-1414-20=5M7-20G
R900743340 M7-1415-30/4M7-22H
R900743493 M7-1416-01=3M7-25=TA
R900744062 M7-1418-30/4M7-22
R900744244 M7-1420-20/7M7-20
R900780188 M7-1420-30/6M7-20
R900744400 M7-1421-31/6M7-22
R900745798 M7-1422-30/4M7-22H
R900745799 M7-1423-30/4M7-22H
R900745822 M7-1424-30=2M7-22=TA
R900746017 M7-1425-30/3M7-22H
R900747701 M7-1426-30/3M7-22
R900748550 M7-1427-30/3M7-22JH
R900749631 M7-1428-30/6M7-22
R900751056 M7-1429-30/2M7-22
R900751058 M7-1430-30/2M7-22
R900751599 M7-1432-30/5M7-22
R900751796 M7-1433-20=7M7-20
R900758324 M7-1433-21=7M7-20
R900751797 M7-1434-20/7M7-20
R900758326 M7-1434-21/7M7-20
R900752473 M7-1435-30/3M7-22
R900752475 M7-1436-30/3M7-22W
R900752476 M7-1437-30/3M7-22
R900752477 M7-1438-30/3M7-22
R900756260 M7-1441-20/7M7-22
R901111240 M7-1441-30/7M7-22
R900758241 M7-1442-20=7M7-20
R901008070 M7-1442-31=7M7-20
R900758242 M7-1443-20=7M7-20
R900761692 M7-1445-30/6M7-22
R900761819 M7-1446-30/3M7-22
R900761825 M7-1447-30/5M7-22
R900761827 M7-1449-30/7M7-22
R900763163 M7-1450-31/4M7-22
R900763617 M7-1451-30/3M7-22
R900763625 M7-1452-30/3M7-22
R900763777 M7-1453-30=5M7-22G
R900767693 M7-1454-30/1M7-22JH
R900767695 M7-1455-30/4M7-22JH
R900767696 M7-1456-30/4M7-22JH
R900767697 M7-1457-31/4M7-22JH
R900768337 M7-1458-20/8M7-20
R900768755 M7-1459-30/3M7-22
R900770800 M7-1461-20/7M7-20
R900771235 M7-1462-30=5M7-22G
R900772198 M7-1463-30/3M7-22
R900772890 M7-1464-30/3M7-22
R900773508 M7-1465-30/3M7-22
R900774427 M7-1466-20/6M7-20
R901008092 M7-1466-31/6M7-20
R900775986 M7-1467-30/2M7-22
R900776854 M7-1468-30/6M7-22
R900775451 M7-1469-30/5M7-22
R900777001 M7-1470-30/5M7-22
R901481735 M7-1470-31/5M7-22H
R900777003 M7-1471-30/5M7-22
R901481736 M7-1471-31/5M7-22H
R900778182 M7-1472-30/3M7-22
R900778581 M7-1473-30/1M7-22JH
R901039464 M7-1474-31/9M7-22
R901125811 M7-1474-32/9M7-22
R900780307 M7-1475-30/3M7-22
R900780333 M7-1476-31/7M7-20
R900780494 M7-1477-20/6M7-22W
R900780831 M7-1478-30/6M7-22
R900784416 M7-1479-30/4M7-22JH
R900783989 M7-1480-13/3M7-22_
R900787325 M7-1483-20/6M7-20
R900787419 M7-1484-30/7M7-22WY
R900787897 M7-1485-31/4M7-22WY
R901000422 M7-1486-30/3M7-22
R901000757 M7-1489-30/6M7-22
R901111278 M7-1489-31/6M7-22
R901133439 M7-1489-32/6M7-22
R901001158 M7-1491-20/5M7-20H
R901003555 M7-1493-30/8M7-22 PROTOTYP
R901237385 M7-1494-33/7M7-20
R901011508 M7-1510-30/3M7-22
R901012025 M7-1511-30/5M7-22
R901013679 M7-1512-30/5M7-22
R901013683 M7-1513-30/4M7-22
R901013958 M7-1514-20/5M7-22
R901014348 M7-1515-31=4M7-22=CV
R901014360 M7-1516-31=4M7-22=CV
R901014363 M7-1517-31=4M7-22=CV
R901015414 M7-1518-30/6M7-22
R901016450 M7-1519-30/1M7-22
R901019219 M7-1520-30/4M7-22H
R901008848 M7-1521-30/3M7-22
R901008887 M7-1522-30/2M7-22
R901017488 M7-1523-30/3M7-22
R901017959 M7-1524-30/3M7-22
R901018053 M7-1525-30/5M7-22
R901021354 M7-1526-00/2M7-25
R901023116 M7-1527-30/6M7-22
R901024509 M7-1528-30/6M7-22
R901462053 M7-1528-31/6M7-22W
R901025858 M7-1529-20/5M7-22
R901083793 M7-1529-30/5M7-22
R901026179 M7-1530-30/3M7-22
R901026262 M7-1531-31/7M7-20
R901026991 M7-1532-30=7M7-22X
R901035601 M7-1532-31=7M7-22X
R901029930 M7-1533-30/3M7-22W
R901027741 M7-1534-31/3M7-22
R901028007 M7-1535-00/4M7-25W
R901030776 M7-1536-20/6M7-20
R901035602 M7-1546-30=7M7-22X
R901035595 M7-1547-30=7M7-22X
R901035596 M7-1548-30=7M7-22X
R901035932 M7-1549-30/4M7-22
R901036039 M7-1550-30/8M7-22
R901111280 M7-1550-31/8M7-22
R901133446 M7-1550-32/8M7-22
R901037199 M7-1551-20/6M7-20
R901038400 M7-1553-30/5M7-22
R901040199 M7-1554-30=7M7-22X
R901005809 M7-1495-30/3M7-22
R901000064 M7-1496-30/3M7-22
R901000077 M7-1497-30/2M7-22
R901000499 M7-1499-30/4M7-22
R901002430 M7-1500-30/2M7-22
R901004586 M7-1501-30/5M7-22
R901005499 M7-1502-30/3M7-22
R901007805 M7-1503-20/6M7-22=LH
R901008556 M7-1504-20/6M7-22
R901010290 M7-1508-31/5M7-22
R901056119 M7-1556-00/6M7-25
R901042386 M7-1557-31/4M7-22
R901043246 M7-1558-30/4M7-22
R901051539 M7-1559-20/6M7-20
R901044770 M7-1560-30/4M7-22H
R901044775 M7-1561-30/4M7-22H
R901043576 M7-1562-30/7M7-22
R901171013 M7-1562-31/7M7-22
R901045602 M7-1564-30/7M7-22
R901050775 M7-1565-30/3M7-22W
R901029201 M7-1537-30/9M7-22W21
R901029473 M7-1538-30/4M7-22H
R901029422 M7-1539-30/5M7-22
R901034728 M7-1540-30/5M7-22
R901036648 M7-1543-30/7M7-22
R901219800 M7-1543-31/7M7-22
R901035285 M7-1544-30=7M7-22
R901185840 M7-1544-31=7M7-22
R901233135 M7-1544-32/7M7-22
R901035598 M7-1545-30=7M7-22X
R901052627 M7-1566-30/6M7-22
R901053552 M7-1567-30/6M7-22
R901060631 M7-1569-30/6M7-22
R901060632 M7-1570-30/9M7-22
R901111281 M7-1570-31/9M7-22
R901133449 M7-1570-32/9M7-22
R901536285 M7-1570-32/9M7-22 *IAM
R901056037 M7-1571-20/5M7-20
R901057307 M7-1572-00/3M7-25
R901084401 M7-1572-01/3M7-25
R901064948 M7-1593-30/8M7-22
R901068259 M7-1596-10/6M7-25
R901066506 M7-1597-21/7M7-20
R901067184 M7-1598-30/6M7-22
R901067324 M7-1599-10/3M7-25
R901067712 M7-1601-30/2M7-22
R901067947 M7-1603-20=5M7-20
R901067952 M7-1604-20=5M7-20
R901067955 M7-1605-20=5M7-20
R901067956 M7-1606-30=5M7-22
R901133430 M7-1582-32/6M7-22
R901062848 M7-1585-20/5M7-20
R901062850 M7-1586-20/5M7-20
R901062854 M7-1587-20/5M7-20
R901062857 M7-1588-30/5M7-22
R901062858 M7-1589-30/5M7-22
R901062859 M7-1590-30/5M7-22
R901062860 M7-1591-30/5M7-22
R901066224 M7-1592-30/8M7-22
R901212406 M7-1592-31/8M7-22
R901067958 M7-1607-30=5M7-22
R901067959 M7-1608-30=5M7-22
R901067960 M7-1609-30=5M7-22
R901068982 M7-1611-31/4M7-22
R901069263 M7-1612-30/4M7-22
R901040772 M7-1614-30/4M7-22
R901070237 M7-1615-30/6M7-22
R901070238 M7-1616-30/6M7-22
R901070239 M7-1617-30/1M7-22
R901070333 M7-1619-20/5M7-22
R901070349 M7-1620-30/6M7-22
R901070368 M7-1621-30/4M7-22
R901072329 M7-1622-20/5M7-20
R901072332 M7-1623-20/5M7-20
R901541166 M7-1623-20/5M7-20 *IAM
R901072335 M7-1624-20/5M7-20
R901072336 M7-1625-30/5M7-22
R901073572 M7-1626-30/7M7-20
R901235434 M7-1626-31/7M7-20
R901073398 M7-1627-30/7M7-22WY
R901084091 M7-1640-30/6M7-22
R901084562 M7-1641-20/6M7-20
R901084563 M7-1642-20/6M7-20
R901084620 M7-1643-30/7M7-22
R901233137 M7-1643-31/7M7-22
R901084516 M7-1644-10/6M7-25
R901087613 M7-1645-10/5M7-25
R901087616 M7-1646-10/8M7-25
R901087731 M7-1647-10/5M7-25
R901088851 M7-1648-30/9M7-22W21
R901099203 M7-1649-10/5M7-25
R901090227 M7-1650-30/7M7-22
R901090557 M7-1651-30/5M7-22
R901091295 M7-1652-30/7M7-22
R901094194 M7-1654-30/4M7-22
R901189637 M7-1654-31/4M7-22
R901094200 M7-1655-30/4M7-22
R901150296 M7-1655-31/4M7-22
R901094262 M7-1656-20/1M7-20
R901133435 M7-1658-31/7M7-22
R901102115 M7-1680-30/4M7-22
R901102830 M7-1681-30/6M7-22
R901103210 M7-1683-10/5M7-25
R901103487 M7-1685-30=4M7-22=CV
R901103821 M7-1686-30/2M7-20
R901103863 M7-1687-30/3M7-22
R901104380 M7-1688-30/6M7-22
R901105381 M7-1691-10/5M7-25
R901106501 M7-1692-30=3M7-22=CV
R901106971 M7-1693-20/6M7-20
R901092321 M7-1659-30/6M7-22
R901092336 M7-1660-30/6M7-22
R901166129 M7-1660-31/7M7-22
R901092341 M7-1661-30/8M7-22
R901092370 M7-1662-30/9M7-22
R901096121 M7-1668-30/3M7-22
R901096122 M7-1669-30/3M7-22
R901096317 M7-1670-30/5M7-22
R901097459 M7-1671-10/5M7-25
R901098064 M7-1672-30/6M7-22
R901107179 M7-1694-30/4M7-22
R901107182 M7-1695-30/4M7-22
R901109244 M7-1696-30/5M7-22
R901111661 M7-1698-30/1M7-22
R901113039 M7-1699-30/5M7-22
R901113041 M7-1700-30/5M7-22
R901113589 M7-1701-30=3M7-22=CV
R901114051 M7-1702-30/5M7-22
R901115860 M7-1703-30/5M7-22
R901115919 M7-1704-30/4M7-22
R901119646 M7-1706-30/8M7-22
R901129742 M7-1707-30/5M7-22
R901119000 M7-1708-30/6M7-25
R901119634 M7-1709-20/5M7-20
R901122887 M7-1711-30/3M7-22
R901123022 M7-1712-30/3M7-22W
R901123399 M7-1713-30/4M7-22
R901123673 M7-1714-30/4M7-22
R901123688 M7-1715-30/7M7-22
R901127804 M7-1717-30/3M7-22W
R901529760 M7-1672-30/6M7-22 *IAM
R901098332 M7-1673-20/5M7-22
R901219455 M7-1673-30/4M7-22
R901098345 M7-1674-30/6M7-22
R901099526 M7-1675-30/6M7-22
R901099543 M7-1676-30/7M7-22
R901233133 M7-1676-31/7M7-22
R901099327 M7-1677-30/5M7-22
R901100211 M7-1678-30/5M7-22
R901101573 M7-1679-30/6M7-22
R901129356 M7-1730-30/6M7-20
R901130255 M7-1731-30/1M7-22H
R901132306 M7-1732-10/5M7-25H
R901132370 M7-1733-10/6M7-25H
R901132438 M7-1734-30=3M7-22=CV
R901133488 M7-1736-30/5M7-22
R901133490 M7-1737-30/4M7-22
R901133491 M7-1738-30/4M7-22
R901133493 M7-1739-30/3M7-22
R901133815 M7-1741-30/3M7-22W
R901127808 M7-1718-30/3M7-22W
R901127809 M7-1719-30/3M7-22W
R901126459 M7-1720-00/6M7-25
R901128717 M7-1721-30/6M7-22
R901127961 M7-1722-30/8M7-22
R901215076 M7-1723-32=4M7-22W=TA
R901130276 M7-1725-30/7M7-20
R901130280 M7-1726-30/7M7-20
R901235435 M7-1726-31/7M7-20
R901130283 M7-1727-30/7M7-20
R901139792 M7-1752-30/3M7-22
R901139794 M7-1753-30/3M7-22
R901144001 M7-1754-30/3M7-22H
R901140540 M7-1755-30/6M7-22
R901216707 M7-1755-31/6M7-22
R901140530 M7-1756-30/4M7-22W21
R901141162 M7-1757-00/5M7-25W21
R901141166 M7-1758-10/6M7-25W21
R901141843 M7-1759-30/3M7-22W21
R901142131 M7-1760-30/5M7-22H
R901152924 M7-1771-30/2M7-22H
R901152929 M7-1772-30/3M7-22H
R901152935 M7-1773-00/1M7-25
R901148770 M7-1774-30/3M7-22W21
R901154471 M7-1775-10/2M7-25=TA
R901154477 M7-1776-10/3M7-25W41=TA
R901169347 M7-1778-20/8M7-20
R901166057 M7-1780-30/6M7-22W21
R901166277 M7-1781-30/4M7-22
R901167132 M7-1782-30/6M7-22W21
R901183193 M7-1797-30/7M7-20
R901174735 M7-1798-30/6M7-20
R901176688 M7-1799-30/7M7-20
R901183220 M7-1800-30/5M7-22
R901179730 M7-1802-30/3M7-22W21
R901179733 M7-1803-30/3M7-22W21
R901184127 M7-1804-30/7M7-25
R901182072 M7-1805-30/4M7-22H
R901183776 M7-1808-30/6M7-22
R901184478 M7-1809-30/7M7-20
R901170723 M7-1784-10/4M7-25H
R901169174 M7-1785-30/6M7-22W21
R901169172 M7-1786-10/3M7-25
R901172725 M7-1788-30/6M7-20
R901169251 M7-1789-30/3M7-22W21
R901169253 M7-1790-30/3M7-22W21
R901169255 M7-1791-30/3M7-22W21
R901171390 M7-1792-30/6M7-22H
R901173119 M7-1795-30/6M7-22W21
R901175267 M7-1796-30/7M7-20
R901182862 M7-1810-30=4M7-22=CV
R901183622 M7-1811-30/3M7-22X
R901184114 M7-1812-30/3M7-22
R901184115 M7-1813-30/4M7-22
R901189248 M7-1814-30/5M7-22
R901189249 M7-1815-30/6M7-22
R901186707 M7-1816-30/6M7-22
R901184818 M7-1817-30/3M7-22=BE
R901189263 M7-1818-30/4M7-20X
R901185358 M7-1820-30/2M7-20X
R901199748 M7-1847-30/7M7-20
R901198792 M7-1848-30/1M7-22
R901199054 M7-1849-30/5M7-22
R901200756 M7-1850-30/6M7-22
R901204703 M7-1852-30/5M7-22
R901209524 M7-1853-30/6M7-22
R901207663 M7-1854-10/3M7-25H
R901203555 M7-1855-30/6M7-22
R901207665 M7-1856-30/6M7-22H
R901208749 M7-1857-30/9M7-22W21
R901209063 M7-1858-30/7M7-22
R901212360 M7-1859-30/4M7-20
R901212408 M7-1860-00/3M7-25
R901212335 M7-1861-30/7M7-22
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A11VO的LE2S控制系統(tǒng)
LE2S控制系統(tǒng)與LRS控制系統(tǒng)不同之處是采用了變功率比例電磁閥和變補(bǔ)償壓力比例電磁閥，可以實(shí)現(xiàn)變功率控制和變補(bǔ)償壓力控制。為此，在LRS控制系統(tǒng)中恒功率閥和油泵流量調(diào)節(jié)閥中都加上了比例電磁鐵，成為變功率比例電磁閥和變補(bǔ)償壓力比例電磁閥。
變功率比例電磁閥
在恒功率閥上加上比例電磁鐵，其電磁力作用在閥桿上，其功能實(shí)際上是改變彈簧作用力。油泵功率與彈簧力FS成正比，通過(guò)改變比例電磁鐵的輸入電流I使電磁力變化，從而改變了油泵的功率控制曲線。
為了充分利用發(fā)動(dòng)機(jī)功率，電控設(shè)定的大功率線高于發(fā)動(dòng)機(jī)額定功率線PH;電控失效后，功率線低于PH,電控小功率線更低。比例電磁鐵控制的恒功率曲線是一個(gè)區(qū)間。變功率控制在挖掘機(jī)有二大功用:
1.實(shí)現(xiàn)全功率控制:無(wú)變功率控制時(shí)，考慮到大氣狀態(tài)(氣壓，氣溫和濕度)變化、采用較差燃油和使用過(guò)程中發(fā)動(dòng)機(jī)性能惡化等原因都會(huì)使得發(fā)動(dòng)機(jī)功率有所下降，為了防止發(fā)動(dòng)機(jī)過(guò)載和熄火,一般油泵功率設(shè)定都低于發(fā)動(dòng)機(jī)額定功率。采用變功率閥，大功率設(shè)定高于發(fā)動(dòng)機(jī)額定功率，可采用轉(zhuǎn)速感應(yīng)控制使發(fā)動(dòng)機(jī)始終保持在發(fā)動(dòng)機(jī)額定轉(zhuǎn)速點(diǎn)工作，充分利用發(fā)動(dòng)機(jī)功率。
2.實(shí)現(xiàn)工況控制:挖掘機(jī)要求在不同工況下作業(yè)，例如重掘削工況、經(jīng)濟(jì)作業(yè)工況和精細(xì)作業(yè)工況等，要求油泵功率有不同的設(shè)定，變功率控制能實(shí)現(xiàn)這個(gè)要求。
油泵流量調(diào)節(jié)變補(bǔ)償壓力閥在油泵流量調(diào)節(jié)閥上加，上比例電磁鐵，通過(guò)改變電流可改變其電磁力，此電磁力作用在流量調(diào)節(jié)閥上，實(shí)際上是改變了彈簧力，上面己說(shuō)明油泵流量調(diào)節(jié)閥的補(bǔ)償壓力取決于彈簧力，改變彈簧力也就改變了補(bǔ)償壓力。補(bǔ)償壓力與電流I成直線關(guān)系。在不同的補(bǔ)償壓力下，供給液壓作用元件的流量與閥桿行程的關(guān)系。降低△PLS，供油量減少;閥稈行程增大，流量增加比較平緩。改變控制電流能使補(bǔ)償壓力變化，補(bǔ)償壓力變化能改變?nèi)ヒ簤鹤饔迷牧髁?起調(diào)速作用,變△PLS控制能更好地適應(yīng)不同作業(yè)工況的流量需要，特別是改善了精細(xì)作業(yè)微動(dòng)性能;另外隨著發(fā)動(dòng)機(jī)轉(zhuǎn)速改變，泵的流量隨著變化，補(bǔ)償壓力也應(yīng)隨之改變。應(yīng)當(dāng)說(shuō)明，補(bǔ)償壓力閥輸出的控制油直接操縱液壓泵變量油缸,而功率閥輸出的控制油經(jīng)補(bǔ)償壓力閥操縱液壓泵變量油缸，因此兩閥的控制關(guān)系為補(bǔ)償壓力閥優(yōu)先。各液壓作用元件液壓回路動(dòng)臂、斗桿和鏟斗液壓回路其特征為:1.在油缸的兩條油路中都設(shè)有限壓閥防止過(guò)載;2.動(dòng)臂和斗桿的液壓回路中若需要可采用再生閥桿，實(shí)現(xiàn)再生功能。
行走液壓回路由以下閥組成:限壓閥二個(gè) 分別限制行走馬達(dá)兩油路壓力，又起補(bǔ)油作用;平衡閥防止下坡時(shí)超速;制動(dòng)操縱閥由左右油路通過(guò)梭形閥引入壓力油，在壓力油作用下此閥打開(kāi)，壓力油通向制動(dòng)器;減壓閥在 壓力油通向制動(dòng)器的途中設(shè)減壓閥，使通向制動(dòng)器的油壓降低，制動(dòng)器承受較低壓力,
剪叉式高空作業(yè)平臺(tái)行走液壓系統(tǒng)
剪叉式高空作業(yè)平臺(tái)是- -種常用的高空作業(yè)專(zhuān)用設(shè)備,其主要作用是將工作人員運(yùn)送
高空進(jìn)行作業(yè)或者垂直運(yùn)送及卸載貨物，廣泛用于食品加工企業(yè)的設(shè)備檢修及材料運(yùn)送、倉(cāng)庫(kù)、建筑、橋梁及公路建設(shè)、電力維修、航空航天、船舶制造等領(lǐng)域。
因此,剪叉式高空作業(yè)平臺(tái)的整機(jī)安全性，行走的穩(wěn)定性,使用的舒適性就顯得尤為重要。
剪叉式高空作業(yè)平臺(tái)行走液壓系統(tǒng)。
行走液壓系統(tǒng)主用來(lái)實(shí)現(xiàn)剪叉式高空作業(yè)平臺(tái)平穩(wěn)行走,通過(guò)相應(yīng)液壓元件的控制，可實(shí)現(xiàn)行走制動(dòng)的啟停及高低速行走。電機(jī)泵為整個(gè)行走系統(tǒng)提供動(dòng)力，過(guò)濾器用來(lái)過(guò)濾液壓回油,調(diào)壓閥用來(lái)控制整個(gè)行走液壓系統(tǒng)的壓力,制動(dòng)器用來(lái)實(shí)現(xiàn)行走的啟停,通過(guò)電磁換向閥與電磁換向閥配合使用,可實(shí)現(xiàn)剪叉前進(jìn)與后退高低速行走，通過(guò)單向閥和的配合使用，可以防止馬達(dá)在系統(tǒng)停止供油時(shí)繼續(xù)行走出現(xiàn)吸空，保證馬達(dá)側(cè)管路充滿液壓油。
起重機(jī)液壓系統(tǒng)主要特點(diǎn)
微動(dòng)性能要求高
回轉(zhuǎn)微動(dòng)性:嚙合間隙、啟動(dòng)停止平穩(wěn)
變幅微動(dòng)性:油缸低速爬行，零泄漏與低摩擦
卷?yè)P(yáng)微動(dòng)性:比例閥閥口、低穩(wěn)定轉(zhuǎn)速、動(dòng)靜摩擦、馬達(dá)泄露
操控性能
速度的可控性:速度無(wú)極變化
舒適性與控制精度
液壓系統(tǒng)工作原理-起重機(jī)
調(diào)速性能廣
作業(yè)效率:
大作業(yè)速度:機(jī)構(gòu)的大轉(zhuǎn)速限制
重載低速、輕載高速:變量馬達(dá)
高可靠性
不會(huì)導(dǎo)致停機(jī)故障、不能完成相關(guān)動(dòng)作
節(jié)能與系統(tǒng)熱平衡
連續(xù)工作時(shí)間
工程機(jī)械行走制動(dòng)系統(tǒng)必須保證在惡劣條件下仍具有良好的制動(dòng)性能，并要求操縱輕便和高可靠性。目前大多數(shù)工程機(jī)械的制動(dòng)系統(tǒng)采用氣頂油的
結(jié)構(gòu)型式，以實(shí)現(xiàn)車(chē)輛的高壓制動(dòng)效能。近年來(lái)，國(guó)外工程機(jī)械出現(xiàn)采用全液壓制動(dòng)的方式，其主要.優(yōu)點(diǎn)是系統(tǒng)的制動(dòng)壓力高，產(chǎn)生的制動(dòng)力矩大，制動(dòng)靈敏，且液壓管路為全封閉的回路，污染性也很小。
液壓制動(dòng)系統(tǒng)一般由制動(dòng)傳動(dòng)裝置和制動(dòng)執(zhí)行元件兩部分組成。前者將制動(dòng)踏板控制的動(dòng)力源傳遞給制動(dòng)執(zhí)行元件;后者是裝在車(chē)輪上的制動(dòng)器，它將傳動(dòng)裝置傳來(lái)的動(dòng)力變成摩擦力矩。
雙回路液壓制動(dòng)系統(tǒng)原理，該系統(tǒng)中的雙路蓄能器充液閥控制蓄能器的充油量和壓力。蓄能器的充油量和高制動(dòng)壓力則根據(jù)制動(dòng)器的用油量、制動(dòng)力和緊急制動(dòng)的次數(shù)來(lái)決定。充液閥的流量和壓力預(yù)設(shè)一上限值，當(dāng)蓄能器的壓力達(dá)到該值時(shí)，充液閥使系統(tǒng)中的一少部分油回流，給蓄能器充壓，蓄能器的壓力達(dá)到設(shè)定值時(shí)，液壓泵卸荷。系統(tǒng)中的充液閥同時(shí)給兩個(gè)蓄能器供油，當(dāng)油泵出現(xiàn)故障時(shí)，兩個(gè)蓄能器分別給兩個(gè)回路的制動(dòng)器供油，既同時(shí)工作又互不影響。另外，系統(tǒng)中設(shè)置的低壓開(kāi)關(guān)可以隨時(shí)提醒駕駛員，當(dāng)蓄能器的壓力連續(xù)下降，并低于報(bào)警開(kāi)關(guān)的預(yù)定值時(shí)，應(yīng)檢查液壓制動(dòng)系統(tǒng)，注意安全。
液壓制動(dòng)系統(tǒng)設(shè)計(jì)
首先，根據(jù)車(chē)重、速度、路況等條件，估算工程機(jī)械行走制動(dòng)所需的制動(dòng)力矩;其次，初步選擇系統(tǒng)壓力，并據(jù)此確定制動(dòng)盤(pán)的直徑、制動(dòng)鉗的尺寸等參數(shù)。制動(dòng)盤(pán)的直徑在能夠安裝的大空間前提下確定，整車(chē)的制動(dòng)力矩是每個(gè)制動(dòng)器產(chǎn)生的制動(dòng)力矩之和，而每個(gè)制動(dòng)器上產(chǎn)生的力矩都取決于系統(tǒng)壓力、制動(dòng)缸活塞的尺寸和數(shù)量、制動(dòng)鉗的尺寸、制動(dòng)鉗與制動(dòng)盤(pán)之間的摩擦系數(shù)等。
根據(jù)制動(dòng)缸的行程和截面積，計(jì)算出單側(cè)制動(dòng)缸所需的油液體積。考慮到在實(shí)際使用中，制動(dòng)器逐漸磨損，為確保安全，應(yīng)以磨損后的舊制動(dòng)器進(jìn)行計(jì)算;然后，求得前、后橋制動(dòng)1次所需的油液總體積:后，按照設(shè)計(jì)要求，當(dāng)制動(dòng)泵不工作時(shí)，蓄能器至少應(yīng)該能夠完成緊急制動(dòng)次數(shù)不少于4~5次，將剛得到的油液總.體積擴(kuò)大5倍，液壓泵排量的確定液壓泵的排量根據(jù)蓄能器的充液時(shí)間來(lái)確定。為了安全，蓄能器的充液時(shí)間長(zhǎng)不能超過(guò)20s。已知蓄能器無(wú)油狀態(tài)時(shí)的容積為V，充滿油液時(shí)的容積為V3，且蓄能器的工作過(guò)程為絕熱過(guò)程,滿足P，Vi=P3 V3， 則一個(gè)蓄能器的體積變化量0V= V1- V3。根據(jù)系統(tǒng)中蓄能器數(shù)量，可求得需要油液的總體積，再根據(jù)充液時(shí)間，計(jì)算出系統(tǒng)流量。又因?yàn)榘l(fā)動(dòng)機(jī)的轉(zhuǎn)速是變化的，所以在計(jì)算泵的排量時(shí)，應(yīng)該按照發(fā)動(dòng)機(jī)在怠速時(shí)的轉(zhuǎn)速來(lái)考慮，再考慮到泵的容積效率為85%，計(jì)算泵的排量q,據(jù)此選擇合適的制動(dòng)泵。
目前液壓行走系統(tǒng)僅用于低速行駛的工程機(jī)械，其作業(yè)裝備也以液壓傳動(dòng)為主，主要是利用了液壓元件布置的獨(dú)立性。但其不適合應(yīng)用于批量生產(chǎn)的小
轎車(chē)以及高速車(chē)輛，原因是效率低，油耗高，而且液壓元件的生產(chǎn)批量也無(wú)法與小轎車(chē)相比。
