?4WRPEH10C3B100L-2X/G24K0/F1M德國力士樂伺服比例閥現(xiàn)貨

經(jīng)營產(chǎn)品：

閥類：電磁閥、換向閥、單向閥、溢流閥、減壓閥、平衡

閥、插裝閥、比例閥等

泵類：齒輪泵、柱塞泵、葉片泵等

承諾：保證原裝正品，假一賠十?量大價(jià)格好商量?。?/p>

武穴黎翔機(jī)電設(shè)備有限公司REXROTH力士樂銷售部

詢價(jià)聯(lián)系人：陳工

詢價(jià)熱線：????0713-8529058，18995766168 ??????????????????????

詢價(jià)QQ:??1477538929，???2593165857?

歡迎您的來電！

傳真：0713-6542758

廣泛應(yīng)用于鋼鐵、冶金、鋁行業(yè)、石油化工、航天、船舶制造、煤炭、水泥、電力、汽車、工程機(jī)械、食品、藥業(yè)、林業(yè)、紡織、皮革、造紙等行業(yè)領(lǐng)域

?力士樂伺服閥的工作原理：Rexroth伺服閥由永磁力矩馬達(dá)、噴嘴、檔板、閥芯、閥套和控制腔組成(見圖)。當(dāng)輸入線圈通入電流 ?伺服閥時(shí)，檔板向右移動(dòng)，使右邊噴嘴的節(jié)流作用加強(qiáng)，流量減少，右側(cè)背壓上升；同時(shí)使左邊噴嘴節(jié)流作用減小，流量增加，左側(cè)背壓下降。閥芯兩端的作用力失去平衡, 閥芯遂向左移動(dòng)。高壓油從S流向C2，送到負(fù)載。負(fù)載回油通過 C1流過回油口，進(jìn)入油箱。閥芯的位移量與力矩馬達(dá)的輸入電流成正比，作用在閥芯上的液壓力與彈簧力相平衡，因此在平衡狀態(tài)下力矩馬達(dá)的差動(dòng)電流與閥芯的位移成正比。如果輸入的電流反向，則流量也反向。表中是伺服閥的分類。
力士樂伺服閥主要用在電氣液壓伺服系統(tǒng)中作為執(zhí)行元件（見液壓伺服系統(tǒng)）。在伺服系統(tǒng)中，液壓執(zhí)行機(jī)構(gòu)同電氣及氣動(dòng)執(zhí)行機(jī)構(gòu)相比，具有快速性好、單位重量輸出功率大、傳動(dòng)平穩(wěn)、抗干擾能力強(qiáng)等特點(diǎn)。另一方面，在伺服系統(tǒng)中傳遞信號(hào)和校正特性時(shí)多用電氣元件。因此，現(xiàn)代高性能的伺服系統(tǒng)也都采用電液方式，力士樂伺服閥就是這種系統(tǒng)的必需元件。力士樂伺服閥結(jié)構(gòu)比較復(fù)雜，造價(jià)高，對油的質(zhì)量和清潔度要求高。新型的伺服閥正試圖克服這些缺點(diǎn)，例如利用電致伸縮元件的伺服閥，使結(jié)構(gòu)大為簡化。另一個(gè)方向是研制特殊的工作油（如電氣粘性油）。這種工作油能在電磁的作用下改變粘性系數(shù)。利用這一性質(zhì)就可通過電信號(hào)直接控制油流。
力士樂伺服電磁閥4WRPH系列
直控式，帶電氣位置反饋，帶內(nèi)置放大器
通徑：6 和 10
2X系列
最高工作壓力350 bar
6通徑最大流量40 L/min
10通徑最大流量1000L/min

4WRPEH10
2X系列
最大工作壓力315bar
最大流量100L/min(△p =70bar)
特點(diǎn)
－10通徑直動(dòng)式比例伺服方向控制閥，采用帶有伺服閥性能的閥芯閥套結(jié)構(gòu)
－具有安全位置的4位4通結(jié)構(gòu)，電磁鐵單邊驅(qū)動(dòng)，斷電時(shí)處于安全位置
－帶有電氣位移反饋的高頻響比例電磁鐵
－集成數(shù)字式控制器，CPU采用32位高速處理器，最優(yōu)化的PID位置控制算法
－差分指令信號(hào)輸入，A1型為0…±10V，F(xiàn)1型為4…20mA
－適用于控制精度要求高的電液伺服控制系統(tǒng)
－底板安裝，安裝面按DIN24 340 A型，ISO 4401和CETOP-RP 121 H
－電氣連接為6P+PE

?比例閥伺服閥的主閥一般來說和換向閥一樣是滑閥結(jié)構(gòu)，只不過閥芯的換向不是靠電磁鐵來推動(dòng)，而是靠前置級(jí)閥輸出的液壓力來推動(dòng)，這一點(diǎn)和電液換向閥比較相似，只不過電液換向閥的前置級(jí)閥是電磁換向閥，而伺服閥的前置級(jí)閥是動(dòng)態(tài)特性比較好的噴嘴擋板閥或射流管閥。也就是說，伺服閥的主閥是靠前置級(jí)閥的輸出壓力來控制的，而前置級(jí)閥的壓力則來自于伺服閥的入口p，假如p口的壓力不足，前置級(jí)閥就不能輸出足夠的壓力來推動(dòng)主閥芯動(dòng)作。而我們知道，當(dāng)負(fù)載為零的時(shí)候，如果四通滑閥完全打開，p口壓力=t口壓力+閥口壓力損失（忽略油路上的其它壓力損失），如果閥口壓力損失很小，t口壓力又為零，那么p口的壓力就不足以供給前置級(jí)閥來推動(dòng)主閥芯，整個(gè)伺服閥就失效了。所以伺服閥的閥口做得偏小，即使在閥口全開的情況下，也要有一定的壓力損失，來維持前置級(jí)閥的正常工作。伺服閥其實(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最高的。就憑著這一個(gè)優(yōu)點(diǎn)，在很多對動(dòng)態(tài)特性要求高的場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。一般說來，好像伺服系統(tǒng)都是閉環(huán)控制，比例多用于開環(huán)控制；其次比例閥類型要多，有比例壓力、流量控制閥等，控制比伺服要靈活一些。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，響應(yīng)要慢。但從發(fā)展趨勢看，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)！
2X2X Software Ltd（簡稱2X）是一家面向快速發(fā)展的基于服務(wù)器計(jì)算架構(gòu)市場的軟件開發(fā)商，全球領(lǐng)先致力于為企業(yè)提供應(yīng)用軟件訪問解決方案的供應(yīng)商。2X在美國、德國、英國、法國、澳大利亞、日本、塞浦路斯、馬耳他分別設(shè)有辦事處。
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【R901382524 4WRPEH6C5B04L-3X/M/24A1德國力士樂比例閥】今日行情
力士樂高頻響比例閥是比例閥中動(dòng)態(tài)響應(yīng)性能最接近伺服閥的一種產(chǎn)品，雖然頻率和敏感度比不上伺服閥，但是它無零位死區(qū)、高精度、高頻響、對油液的清潔度要求比伺服閥低，因此它具有更高的工作可靠性。
采用力士樂高頻響比例閥時(shí)應(yīng)同時(shí)采用蓄能器或增設(shè)緩沖回路以消除液壓沖擊，因?yàn)楣苈返臎_擊也影響著高頻響比例閥的穩(wěn)定響應(yīng)。油路長度是否合理、管路壁厚是否合理、管路是否緊固、直接影響到管路的固有頻率，從而影響著比例閥的穩(wěn)定響應(yīng)。
一、高頻響比例閥工作原理
下面以某鋼鐵廠煉鐵分廠爐頂料流調(diào)節(jié)閥液壓控制系統(tǒng)采用的高頻響比例控制為例來說明，基本結(jié)構(gòu)如圖1。

這是BOSCHRESROTH公司生產(chǎn)的一種直接作用滑閥式比例閥，驅(qū)動(dòng)是帶位置反饋和放大器的電磁鐵。工作原理如圖2所示，高頻響比例電磁鐵驅(qū)動(dòng)閥芯，位移由位置傳感器反饋，由內(nèi)置電子線路進(jìn)行閥芯的閉環(huán)控制。經(jīng)計(jì)算機(jī)運(yùn)算處理后執(zhí)行機(jī)構(gòu)動(dòng)作的電氣信號(hào)由放大器放大后，電磁鐵線圈中就有電流通過，在電液轉(zhuǎn)換器中將電氣信號(hào)轉(zhuǎn)換成液壓信號(hào)，使比例閥主閥芯移動(dòng)。一個(gè)帶放大器的系統(tǒng)，比無放大器的系統(tǒng)重復(fù)精度要高得多，而精度直接與放大器的增益有關(guān)。
由圖3可以看出，由實(shí)際輸出的速度和位置所對應(yīng)的液壓信號(hào)轉(zhuǎn)變成電氣信號(hào)，與計(jì)算機(jī)所給的指令系統(tǒng)信號(hào)進(jìn)行比較，得出的電氣信號(hào)轉(zhuǎn)換成液壓信號(hào)得出油缸的輸出，這個(gè)輸出是個(gè)動(dòng)態(tài)響應(yīng)不斷調(diào)整的過程。

該調(diào)節(jié)閥的輸入控制信號(hào)為標(biāo)準(zhǔn)4～20mA電流，通過調(diào)節(jié)信號(hào)電流的大小控制液流的方向和流量大小。比例閥的中間位為12mA，此時(shí)閥的開度為0;12～20mA為正向開度控制（正向0～最大開度），12～4mA為反向開度控制（反向0～最大開度）。接口控制原理圖見圖4。

其流量輸出穩(wěn)態(tài)調(diào)節(jié)特性無中位死區(qū)，它允許的油液污染等級(jí)按NAS1638標(biāo)準(zhǔn)為7、8、9級(jí)，采用βx=75的過濾器就可以達(dá)到要求，它的滯


環(huán)≤0.2%，制造公差<10%，響應(yīng)時(shí)間（信號(hào)變化從100%）≤25ms，溫漂在ΔT=40℃時(shí)，零點(diǎn)位移量<1%。負(fù)載腔達(dá)80%供油壓力，工作頻寬和性能已達(dá)高水準(zhǔn)的伺服閥，而成本只是伺服閥的1/3。
二、故障分析
1、閥門反應(yīng)速度太慢，動(dòng)態(tài)失效，原因可能是閥太臟，節(jié)流孔被堵住，不過最好不要自己拆，應(yīng)該找廠家配合清洗伺服閥。
2、油路通，卻無法靜載啟動(dòng)即系統(tǒng)無法平衡可能是密封件失效，更換密封件即可。
3、測試時(shí)油缸出現(xiàn)抖動(dòng)，經(jīng)過調(diào)試程序時(shí)發(fā)現(xiàn)放大器的增益太高，適當(dāng)減小放大器的增益不會(huì)對系統(tǒng)有影響，不過也不能太低，否則系統(tǒng)可能會(huì)不穩(wěn)定。高頻響比例控制閥的調(diào)節(jié)主要是靠放大器的調(diào)節(jié)。
4、在調(diào)試過程中，遇到油缸速度低并且有時(shí)不能驅(qū)動(dòng)的現(xiàn)象時(shí)，排除液壓系統(tǒng)的故障后，經(jīng)查找發(fā)現(xiàn)是由于伺服放大器的供電線路過長、且供電線路線徑過小，使得閥門在工作時(shí)供電電流增加引起線路壓降增大，從而使得到放大器的驅(qū)動(dòng)電壓低于系統(tǒng)要求的規(guī)定值使閥門無法被驅(qū)動(dòng)。后更換了放大器的供電電纜（由4×0.75mm2更換為4×2.5mm2的控制電纜）后問題得以解決。0811404643 4WRPEH6C3B25P-2X/G24K0/A1M
力士樂液壓元件: 柱塞泵A10VSO、電磁閥4WE、溢流閥DBW、節(jié)流閥Z2S、Z2F、葉片泵PV7、齒輪泵PH2,PH4,PGF、壓力繼電器HED、博世放大器 閥0811、0820 、齒輪泵0510、減壓閥DR、ZDR、4WREE、4WRPE等系列特價(jià)現(xiàn)貨優(yōu)勢供應(yīng)
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力士樂比例閥,比例流量閥 液壓閥
帶位置反饋的先導(dǎo)式比例方向閥有10通徑和35通徑兩種規(guī)格，高工作壓力350 bar，大流量3000 L/min.
特點(diǎn)：
先導(dǎo)控制二級(jí)比例方向閥；閥用于控制液流的方向和大小；
通過比例電磁鐵控制；
使用電位置反饋；
主閥芯彈簧對中；
先導(dǎo)控制為單級(jí)比例方向閥；
內(nèi)置放大器。
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