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液壓閥塊的投入使用對(duì)液壓系統(tǒng)的集成效果有 了質(zhì)的提高，同時(shí)簡(jiǎn)化了系統(tǒng)，增加了系統(tǒng)運(yùn)行的可 靠性。目前國(guó)內(nèi)液壓生產(chǎn)廠家已經(jīng)設(shè)計(jì)、制造出用 于各種液壓系統(tǒng)的液壓閥塊，并且漸趨形成定型化＼ 標(biāo)準(zhǔn)化產(chǎn)品。
隨著計(jì)算機(jī)輔助設(shè)計(jì)在液壓閥塊方面工作的發(fā) 展，閥塊設(shè)計(jì)軟件除了能完成孔道設(shè)計(jì)和校驗(yàn)外，還 可輸出閥塊的平面圖，直接用于生產(chǎn)加工，這樣就大 大提高生產(chǎn)效率。
組合式液壓缸是 近幾年出來的一種新型液壓缸，也是工程與應(yīng)用需要而產(chǎn)生的一種液壓缸。
目前大致有2種組合式液壓缸：
1、活塞式液壓缸
構(gòu)成：采用兩個(gè)活塞式液壓缸組成一個(gè)組合式液壓缸：其中一個(gè)活塞式液壓缸的活塞桿為另一個(gè)活塞式液壓缸的缸體。
特點(diǎn)：1）工作可靠，性能穩(wěn)定，結(jié)構(gòu)簡(jiǎn)單，可實(shí)現(xiàn)多個(gè)壓力腔的組合；
2）便于實(shí)現(xiàn)速度控制，特別是能夠滿足鉆機(jī)、修井機(jī)的大鉤的各種速度要求。
適用范圍：液壓蓄能石油鉆機(jī)、液壓蓄能石油修井機(jī)等大型液壓設(shè)備用組合式液壓缸。
使用經(jīng)驗(yàn)：為液壓蓄能石油鉆機(jī)及液壓蓄能石油修井機(jī)等大型液壓設(shè)備提供一種便于加工、維修和控制的組合式液壓缸。
缺點(diǎn)：不具備大型液壓缸，長(zhǎng)行程等液壓缸等的作用。適合小動(dòng)力，短行程等動(dòng)力和動(dòng)作需求。
2、筒體組合式液壓缸
原理與構(gòu)成：采用多節(jié)缸筒與缸筒組合聯(lián)接型式為圓錐面嚙合定位聯(lián)接；聯(lián)接用的緊固件采用液壓螺母緊固技術(shù)；活塞密封結(jié)構(gòu)采用二級(jí)交替密封技術(shù)。
應(yīng)用優(yōu)點(diǎn)：1）由至少兩節(jié)缸筒組合一體的長(zhǎng)度數(shù)倍于常規(guī)單支缸筒的長(zhǎng)度，只要是活塞桿能實(shí)現(xiàn)的長(zhǎng)度都可以與其匹配，從而達(dá)到液壓缸超長(zhǎng)行程動(dòng)作以及恒定輸出力的理想值；
2）便于安裝、調(diào)整、拆卸和檢修，特別是在安裝置放，拆卸困難的狹窄或特殊工作地點(diǎn)使用；
3) 可直接降低使用成本，液壓缸在工作中不可避免的會(huì)出現(xiàn)的內(nèi)孔損傷或磨損，本結(jié)構(gòu)型式可僅對(duì)某節(jié)段缸筒進(jìn)行修復(fù)或更新不需要更換全長(zhǎng)缸筒。
缺點(diǎn)：不具備大型液壓缸，長(zhǎng)行程等液壓缸等的作用。適合小動(dòng)力，短行程等動(dòng)力和動(dòng)作需求。
圓油SOB,SOD,ROB,ROD,HROA,HROB,HROE,HROD液壓油缸：
HSG型工程用液壓缸是說作用單活塞桿缸，主要用于各種工程機(jī)械、起重機(jī)械及礦山機(jī)械等的液壓傳動(dòng)。
工作媒介為標(biāo)準(zhǔn)的液壓油?？刹捎枚喾N安裝方式（前法蘭、后耳環(huán)、后法蘭、中間擺軸、等）
適用壓力范圍0.3mpa-31.5mpa，適用溫度范圍為-10度-70度。
對(duì)于液壓油缸的選用，我們一般在選用液壓油缸的過程當(dāng)中都會(huì)依照內(nèi)徑、行程、使用壓力、安裝型式去選擇液壓油缸，其實(shí)除了這些外還有以下幾點(diǎn)是值得我們?nèi)プ⒁獾?，首先液壓缸?fù)載后作動(dòng)速度達(dá)到某一標(biāo)準(zhǔn)以上時(shí)，必須需用有緩沖裝置的液壓缸?；蛘哌_(dá)到更高速度時(shí)必須在液壓缸外，加裝減速閥。其次是慎選液壓油與油封。不同的液壓油滴用不同材質(zhì)的油封，以保證液壓缸的壽命。
因?yàn)橐簤河透滓惺芎艽蟮膲簭?qiáng)，負(fù)載越重，它的壓強(qiáng)就會(huì)越大，因此，做好液壓油缸的保養(yǎng)工作是整個(gè)液壓系統(tǒng)的維護(hù)***重要的一環(huán)。
液壓油缸就相當(dāng)于液壓系統(tǒng)的心臟，心臟出問題很難修補(bǔ)，所以液壓油缸的維護(hù)就是要謹(jǐn)慎細(xì)致。
首先，要防銹。因?yàn)橐簤河透椎幕钊糠衷诠ぷ鳡顟B(tài)中是要伸出油缸的，自然就會(huì)受到氧化物的、酸性氣體的侵蝕，這就需要我們給它涂敷適量的油脂進(jìn)行保護(hù)，以免作為承重部件的活塞受侵蝕而在工作中可能發(fā)生斷折。
其次，要開箱換油。因?yàn)殚L(zhǎng)時(shí)間使用，難免會(huì)有異物進(jìn)入液壓油缸中，這樣在使用中就會(huì)發(fā)生摩擦增大現(xiàn)象，另外，液壓油也是有一定的使用壽命，長(zhǎng)時(shí)間不換油會(huì)損壞或者侵蝕液壓油缸內(nèi)部。
治不如防，因此在液壓油缸的工作中要控制速度適當(dāng)，不要超過2m/s，這樣可以延長(zhǎng)液壓油缸的使用壽命，另外為了保護(hù)機(jī)構(gòu)和安全起見，內(nèi)部安裝緩沖裝置對(duì)于液壓油缸的保護(hù)是十分有效
精密減壓閥是可自動(dòng)降低管路工作壓力的一種裝置，它可以將閥前管路較高的液體壓力減少至閥后管路所需的水平。精密減壓閥廣泛用于高層建筑、城市給水管網(wǎng)水壓過高的區(qū)域、礦井及其他場(chǎng)合，來保證給水系統(tǒng)中各用水點(diǎn)都能獲得適當(dāng)?shù)乃畨汉土髁?。市?chǎng)上的精密減壓閥品牌是有很多的，下面我們就一起來詳細(xì)了解一下吧！

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