上海韋米機(jī)電設(shè)備有限公司

4WRBA10EA75-2X/G24K4/M-828液壓比例控制閥由上海韋米機(jī)電設(shè)備有限公司有經(jīng)驗(yàn)提供

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4WRBA10EA75-2X/G24K4/M-828液壓比例控制閥

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

電液比例閥是比例控制系統(tǒng)中的主要功率放大元件,按輸入電信號(hào)指令連續(xù)地成比例地控制液壓系統(tǒng)的壓辦流量等參數(shù)。與伺 服控制系統(tǒng)中的伺服閥相比,在某些方面還有一-定的性能差距(主要性能比較如表1所示),但它顯著的優(yōu)點(diǎn)是抗污染能力強(qiáng),大大地減少了由污染而造成的工作故障,提高了液壓系統(tǒng)的工作穩(wěn)定性和可靠性。另一方面比例閥的成本比伺服閥低，結(jié)構(gòu)也簡單,已在許多場合獲得廣泛應(yīng)用。

比例閥供應(yīng)型號(hào)

力士樂REXROTH比例方向閥，直動(dòng)式

力士樂REXROTH二位四通和三位四通比例方向閥直控式，閥芯不帶位移電反饋，不帶集成式放大版（OBE）4WRA

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力士樂REXROTH二位四通和三位四通比例方向閥直控式，閥芯不帶位移電反饋，帶集成式放大版（OBE）4WRAE

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液壓閥的作用

液壓閥是用來控制液壓系統(tǒng)中油液的壓力、流量和液體流動(dòng)方向。

二、液壓閥的分類

按功能分:

方向控制閥(單向閥、換向閥)

壓力控制閥(溢流閥、減壓閥、順序閥、壓力繼電器)

流量控制閥(節(jié)流閥、調(diào)速閥)

按操縱方式分:

手動(dòng)和腳踏、機(jī)動(dòng)、電動(dòng)、液動(dòng)、電液動(dòng)等。

共同點(diǎn)

(1) 在結(jié)構(gòu)上，所有的閥都有閥體、閥芯(轉(zhuǎn)閥或滑閥)和驅(qū)使閥芯動(dòng)作的部件(如彈簧、電磁鐵)組成。

(2)在工作原理上，所有閥的開口大小，閥進(jìn)、出口壓差以及流過閥的流量之間的關(guān)系都符合孔口流量公式，僅是各種閥控制的參數(shù)各不相同而已。

三、對(duì)液壓閥的基本要求

(1)動(dòng)作靈敏，使用可靠，工作時(shí)沖擊和振動(dòng)小。

(2)油液流過的壓力損失小。

(3)密封性能好。

(4)結(jié)構(gòu)緊湊，安裝、調(diào)整、使用、維護(hù)方便，通用性大。

方向控制閥

類型:單向閥、換向閥

一、單向閥

類型:普通單向閥、液控單向閥

1、普通單向閥

作用:只允許油液沿一個(gè)方向流動(dòng)，不允許油液反向倒流(起止回作用)

對(duì)單向閥的性能要求:

(1) 正向?qū)�通時(shí)，壓力損失要小;

(2)反向截止時(shí)，密封性要好。

2、

液控單向閥

作用:

(1)起止回作用;

(2)必要時(shí)解除逆止，允許油液反向通過。

3、單向閥用途

(1)止回作用:安裝在泵的出口，p.=0.3~0.5 bar

(2)作背壓閥用:防止液壓缸前沖或爬行，使系統(tǒng)作平穩(wěn)。

(3)作鎖緊裝置用:起重機(jī)支腿、夾緊回路等。

(4)保持控制油路有必要的壓力: Pr≥P液挖

(5)作復(fù)合閥使用:單向節(jié)流閥、單向順序閥、單向減壓閥、單向調(diào)速閥等。

(6)局部回路作安全閥使用: Ppr>P換熱器正常工作的距力

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力士樂REXROTH比例方向閥，直控式4WRA ...XE

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力士樂REXROTH二位四通和三位四通比例方向閥直控式，閥芯帶位移電反饋，不帶集成式放大版（OBE）4WRE