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液壓行走系統(tǒng)的組成和形式
工程機(jī)械液壓行走系統(tǒng)的要求和基本組成
工程機(jī)械作業(yè)時(shí)牽引力和車(chē)速的變化范圍大,并且負(fù)載變化劇烈、頻繁、工作條件苛刻、溫差大、泥土粉塵多,因而對(duì)液壓行走系統(tǒng)有如下要求:
(1)高功率密度;
(2)能耐受相對(duì)惡劣的工作環(huán)境和由于油箱容量限制而出現(xiàn)的高的油溫;
(3)泵需具備雙向變量的能力,泵和馬達(dá)均應(yīng)有可逆性;
(4)使用可靠、耐久、壽命長(zhǎng);
(5)體積小、結(jié)構(gòu)緊湊、價(jià)格低;
(6)噪聲振動(dòng)低。
液壓行走機(jī)械的基本組成;
定量馬達(dá)-沖洗溢流閥-真空壓力表-油箱-散熱器旁通閥-流量控制閥-控制手柄-雙向變量泵-伺服控制閥-油缸-多功能閥-補(bǔ)油泵-補(bǔ)油溢流閥-回路沖洗閥。
液壓行走系統(tǒng)的基本型式
根據(jù)不同的分類(lèi)方法,液壓行走系統(tǒng)的基本型式主要有以下幾種。
1.開(kāi)式和閉式系統(tǒng)
按油液循環(huán)方式的不同,可分為開(kāi)式系統(tǒng)和閉式系統(tǒng)。
(1)開(kāi)式系統(tǒng):系統(tǒng)結(jié)構(gòu)簡(jiǎn)單,構(gòu)成靈活,但油箱體積大,油液常與空氣接觸,工作機(jī)構(gòu)運(yùn)動(dòng)不平穩(wěn);要在回油路上加背壓以提高系統(tǒng)的穩(wěn)定性;換向過(guò)程中會(huì)出現(xiàn)液壓沖擊和能量損失;系統(tǒng)效率低,只是在一些小型車(chē)輛 上偶爾采用帶有平衡背壓的開(kāi)式回路。
(2)閉式系統(tǒng):結(jié)構(gòu)緊湊,傳動(dòng)平穩(wěn)性好。內(nèi)設(shè)補(bǔ)油泵,以補(bǔ)償系統(tǒng)的泄漏并對(duì)油液冷卻,同時(shí)也為控制機(jī)構(gòu)和某些低壓工作的輔助機(jī)構(gòu)提供動(dòng)力。工作機(jī)構(gòu)的變速和換向通過(guò)調(diào)節(jié)泵或馬達(dá)的變量機(jī)構(gòu)實(shí)現(xiàn),避免了在開(kāi)式系統(tǒng)換向過(guò)程中所出現(xiàn)的液壓沖擊和能量損失;系統(tǒng)效率較開(kāi)式系統(tǒng)高。
2.高速和低速方案
按驅(qū)動(dòng)輪是否直接由液壓馬達(dá)驅(qū)動(dòng),可分為低速和高速兩種方案。
(1)低速方案:低速大扭矩液壓馬達(dá)直接驅(qū)動(dòng)車(chē)輪。安裝空間小:功率損失小和機(jī)械噪聲低;降低了驅(qū)動(dòng)輪的轉(zhuǎn)動(dòng)慣量,有利于提高系統(tǒng)的調(diào)節(jié)品質(zhì)和減少?zèng)_擊負(fù)荷。但馬達(dá)要承受各種徑向和軸向載荷。
(2)高速方案:采用高速馬達(dá),通過(guò)減速器減速來(lái)提高輸出轉(zhuǎn)矩,利用中間傳動(dòng)環(huán)節(jié)來(lái)分擔(dān)徑向和軸向載荷。通過(guò)選擇減速比可方便地匹配主機(jī)參數(shù),對(duì)馬達(dá)的承載要求相對(duì)較低。
對(duì)于這兩種方案來(lái)講,高速方案應(yīng)用較多,主要是由于低速大扭矩馬達(dá)的制造工藝要求較高,難于制造;維修保養(yǎng)要求水平高;成本高。
REXROTH電磁閥R930063870 OD150217A000000
德國(guó)力士樂(lè)REXROTH電磁閥訂貨號(hào)和型號(hào):
R930063870 ODI50217A000000-VEI-016-NO-12G-A-02-0000
R930063874 ODI50221A000000-VEI-016-NO-16G-A-02-0000
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R930064102 ODI53217A000000-VEI-016-NO-12G-A-32-0000
R930064265 ODI50617A000000-VEI-016-NO-12G-A-06-0000
R930064334 ODI50617B000000-VEI-016-NO-12G-B-06-0000
R930064361 ODI50918A000000-VEI-016-NC-08A-A-09-0000
R930064362 ODI51117A000000-VEI-016-NC-12G-A-11-0000
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R930065029 ODI53218E000000-C1_SAMPLE_VEI-016-NO-08&
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R930065610 ODI50317A800000-VEI-S16-NC-12G-A-03-0000
R930065627
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R930065857 ODI50318D800000-VEI-S16-NC-08A-D-03-0000
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R930067157 ODI53217CP00000-VEI-016-NO-12G-C-32-P000
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R930067160 ODI53217C000000-VEI-016-NO-12G-C-32-0000
R930067161 ODI53217B000000-VEI-016-NO-12G-B-32-0000
R930067162 ODI53117D000000-VEI-016-NC-12G-D-31-0000
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R930067236 ODI53118DX00000-VEI-S16-NC-08A-D-31-0000
R930067428 ODI53118F000000-VEI-016-NC-08A-F-31-0000
R930067585 ODI53136A800000-VEI-S16-NC-10A-A-31-0000
R930067586 ODI53236A000000-VEI-016-NO-10A-A-32-0000
R930067587 ODI53236C000000-VEI-016-NO-10A-C-32-0000
R930067588 ODI53117D800000-VEI-S16-NC-12G-D-31-0000
R930067589 ODI53236B000000-VEI-016-NO-10A-B-32-0000
R930067786 ODI53217AV00000-VEI-016-NO-12G-A-32-V000
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R930068775 ODI50217B000000-VEI-016-NO-12G-B-02-0000
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R930068779 ODI50618B000010-C1_ SAMPLE_VEI-016-NO-0&
R930068784 ODI50518A8000V0-VEI-VS16-NC-08A-A05-0000
R930068786 ODI53136D800000-VEI-S16-NC-10A-D-31-0000
R930068881 ODI51119A800000-VEI-S16-NC-08S-A-11-0000
R930068927 ODI50121A800000-VEI-S16-NC-16G-A-01-0000
R930069046 ODI50489A000000-VEI-016-NO-12A-A-04-0000
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R930069351 ODI50618CP00010-VEI-016-NO-08A-C-06-P000
R930069352 ODI50617A000010-VEI-016-NO-12G-A-06-0000
R930069360 ODI53121A800000-VEI-S16-NC-16G-A-01-0000
R930069373 ODI50418CP00000-VEI-016-NO-08A-C-03-P000
R930069393 ODI50618A000020-C1_ SAMPLE_VEI-016-NO-0&
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R930069397 ODI53221C000000-VEI-016-NO-16G-C-32-0000
R930069415 ODI53117DP00000-VEI-016-NC-12G-D-31-P000
R930069496 ODI53136AV00000-VEI-016-NC-10A-A-31-V000
R930069497 ODI50536D800000-VEI-S16-NC-10A-D-05-0000
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R930069502 ODI50589A800000-VEI-S16-NC-12A-A-05-0000
R930069503 ODI53118AV00000-VEI-016-NC-08A-A-31-V000
R930069505 ODI53121D800000-VEI-S16-NC-16G-D-31-0000
R930069632
R930069633 ODI53221G000000-VEI-016-NO-16G-G-32-0000
R930069635 ODI50689C000000-VEI-016-NO-12A-C-06-0000
R930069699 ODI50321D000000-VEI-016-NC-16G-D-03-0000
R930069700 ODI50676A000000-VEI-016-NO-10A-A-06-0000
R930069701 ODI50676CP00000-VEI-016-NO-10A-C-06-P000
R930069810 ODI53221GP00000-VEI-016-NO-16G-G-32-P000
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R930069967 ODI50676A000010-VEI-016-NO-10A-A-06-0000
R930069968
R930069969
R930069970
R930070069 ODI50321A000000-VEI-016-NC-16G-A-03-0000
R930070148 ODI53117DV00000-VEI-016-NC-12G-D-31-V000
R930070199 ODI50321D800000-VEI-S16-NC-16G-D-03-0000
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R930070203 ODI50536DV00000-VEI-016-NC-10A-D-05-V000
R930070261 ODI50517D800000-VEI-S16-NC-12G-D-05-0000
對(duì)液壓油性能的要求
在液壓傳動(dòng)中,液壓油既是傳遞動(dòng)力的介質(zhì),又是潤(rùn)滑劑,在部分元件中又起密封作用,系統(tǒng)中的熱量也是通過(guò)油液擴(kuò)散出去的,因此又起到散熱作用。因此,為保證液壓系統(tǒng)可靠、有效、經(jīng)濟(jì)地工作,液壓油必須保證以下幾點(diǎn)要求:1)適當(dāng)?shù)恼扯。粘度是表示油液流?dòng)時(shí)分子間磨擦阻力的大小。粘度過(guò)大時(shí)油液流動(dòng)時(shí)阻力大,能量損失大,系統(tǒng)效率降低。此外,主機(jī)空載損失加大,溫升快且工作溫度高,在主泵吸油端易出現(xiàn)“空穴”現(xiàn)象。粘度過(guò)小時(shí)則不能保證液壓元件良好的潤(rùn)滑條件,加劇元件的磨損,泄漏增加,液壓系統(tǒng)效率也要降低。2)良好的粘溫特性。粘溫特性是指油液粘度升降隨溫度而變化的程度,通常用粘度指數(shù)表示。粘度指數(shù)越大,液壓系統(tǒng)工作中油液粘度隨溫度升高下降越小,從而使液壓系統(tǒng)的內(nèi)漏不致過(guò)大。粘度指數(shù)一般不得低于90。3)良好的抗磨性及潤(rùn)滑性。目的是為了降低機(jī)械磨擦,保證在不同的壓力、速度和溫度等條件下都有足夠的油膜強(qiáng)度。4)較高的化學(xué)反應(yīng)穩(wěn)定性能,不易氧化和變質(zhì)。實(shí)踐證明,油溫每升高10℃,其化學(xué)反應(yīng)速度提高約一倍。舒緩反應(yīng)安定性好的液壓油長(zhǎng)時(shí)間使用不易發(fā)生氧化變質(zhì),可以保證液壓油的正常循環(huán)。5)質(zhì)量應(yīng)純凈,應(yīng)盡量減少機(jī)械雜質(zhì)、水分和灰塵等的含量。6)對(duì)密封件的影響要小。7)抗乳化性要好,不易引起泡沫?谷榛允侵赣鸵褐谢烊肓怂⒔(jīng)攪動(dòng)后不成為乳化液、水從其中分離出來(lái)的能力。抗泡沫性是指油液中混入空氣并經(jīng)攪動(dòng)后不生成乳狀液、氣泡從油中分離出來(lái)的能力;烊胨蚩諝夂蠼档土艘簤河偷娜莘e模數(shù),可壓縮性加大,液壓元件動(dòng)作遲緩,并易產(chǎn)生沖擊和振動(dòng)。8)防銹性能好。液壓油覆蓋在零件表面,避免其被氧化銹蝕。9)抗剪力安定性好。為改善油液的粘度指數(shù),油液中往往加入聚甲基丙烯酯,聚異丁烯等高分子聚合物,這些物質(zhì)分子鏈較長(zhǎng),油液流經(jīng)液壓元件的狹縫時(shí)受到很大的剪切作用,往往會(huì)使分子斷鏈,油液粘溫特性下降。10)燃點(diǎn)、閃點(diǎn)應(yīng)滿足環(huán)境溫度,揮發(fā)性要小,以確保液壓油使用安全。
德國(guó)力士樂(lè)REXROTH螺紋插裝閥訂貨號(hào)和型號(hào):
R930070262 ODI50917D000000-VEI-016-NC-12G-D-09-0000
R930070263
R930070265 ODI50719A0DOC00-VEI-016-NC-08S-A-07-0DOC
R930070355
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R930070645 ODI50521A800010-VEI-S16-NC-16G-A-05-0000
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R930070835 ODI53275C000000-VEI-016-NO-16A-C-32-0000
R930070859 ODI53218BP00000-VEI-016-NO-08A-B-32-P000
R930071138 ODI53189D800000-VEI-S16-NC-12A-D-31-0000
R930071419 ODI53218CV00000-C1_SAMPLE_VEI-016-NO-08&
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