力士樂 2WRCE32S480R-2X/PG24K31/A1M-130

伺服控制閥

伺服控制閥輸入信號(hào)(電量、機(jī)械量)多為偏差信號(hào)(輸入信號(hào)與反饋信號(hào)的差值),閥的輸出量(壓力、流量)也按照其輸入量連續(xù)、成比例地進(jìn)行控制的閥。這類閥的工作性能類似于比例控制閥,但具有較高的動(dòng)態(tài)瞬應(yīng)和靜態(tài)性能,多用于要求較高的、響應(yīng)快的閉環(huán)液壓控制系統(tǒng)。

大型鋼廠現(xiàn)場采用的主要伺服閥如:伺服閥，

1、基本結(jié)構(gòu)：

主閥體（閥芯/閥套）、先導(dǎo)閥（伺服射流管）、電氣控制盒（放大版）

2、工作原理

伺服射流管先導(dǎo)級(jí)

射流管先導(dǎo)級(jí)主要由力矩馬達(dá)、射流管和接收器組成。

當(dāng)線圈中有電流通過時(shí),產(chǎn)生的電磁力使射流管噴嘴偏離零位,管內(nèi)的大部分液流集中射向一側(cè)的接收器,而另一側(cè)接收 器所得到的流量減少,由此造成兩接收器的壓力變化。主閥閥芯因此壓差而產(chǎn)生位移。

先導(dǎo)級(jí)的泄漏油通過噴嘴環(huán)形區(qū)域處的排出通道直接回油箱。

液壓伺服控制系統(tǒng)

以伺服控制元件完成動(dòng)力與運(yùn)動(dòng)方向控制，綜合壓力、流量、方向控制為一體，利用偏差控制進(jìn)行糾偏，以滿足精度控制需要，必須為閉環(huán)控制，可實(shí)現(xiàn)較高頻率( 100HZ以上) ,有滑閥式、噴嘴擋板式、射流管式等，常采用機(jī)械伺服、電液伺服、氣液伺服。

液壓伺服系統(tǒng)的特點(diǎn)如下:

(1)反饋。把輸出量的一部分或全部按一定方式回送到輸入端，并和輸入信號(hào)進(jìn)行比較，這就是反饋。在上例中，反饋(檢測時(shí)速裝置輸出)電壓和給定(輸入信號(hào))電壓是異號(hào)的，即反饋信號(hào)不斷地抵消輸入信號(hào)，這是負(fù)反饋。自動(dòng)控制系統(tǒng)大多數(shù)是負(fù)反饋。

(2)偏差。要使液壓缸輸出一定的力和速度，伺服閥必須有一定的開口量，因此輸入和輸出之間必須有偏差信號(hào)。液壓缸運(yùn)動(dòng)的結(jié)果又力圖消除這個(gè)誤差。但在伺服系統(tǒng)工作的任何時(shí)刻都不能完全消除這一-偏差，伺服系統(tǒng)正是依靠這一-偏差信號(hào)進(jìn)行工作的。

(3)放大。執(zhí)行元件(液壓缸)輸出的力和功率遠(yuǎn)遠(yuǎn)大于輸入信號(hào)的力和功率，其輸出的能量是液壓能源供給的。

(4)跟進(jìn)。液壓缸的輸出量完全跟進(jìn)輸入信號(hào)的變化。

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。

型號(hào) 2WRCE…/P and 3WRCE…/P 

高頻響方向閥（塊狀安裝），先導(dǎo)式，帶集成電控器（OBE）和電位反饋

規(guī)格32至50

元件系列2X

安裝尺寸按照DIN ISO 7368 (2WRCE型)

適合位置、速度和壓力的閉環(huán)控制

通過比例閥控制

結(jié)構(gòu)緊固

通過感應(yīng)位置監(jiān)測器對(duì)控制閥芯進(jìn)行位置感應(yīng)

規(guī)格63和80，請(qǐng)?jiān)儐柋竟?

力士樂REXROTH三位三通方向高響應(yīng)閥，先導(dǎo)操作，電感位置傳感器3WRCBH

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力士樂REXROTH三位三通高響應(yīng)方向閥（插裝閥）與集成控制電子3WRCBEE

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力士樂REXROTH二通高響應(yīng)插裝閥2WRCE...-2X/P

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力士樂REXROTH三通高速響應(yīng)插裝閥3WRCE...-2X/P

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力士樂REXROTH二通高響應(yīng)插裝閥2WRC(E)...-1X/S

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