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伺服控制閥

伺服控制閥輸入信號(電量、機械量)多為偏差信號(輸入信號與反饋信號的差值),閥的輸出量(壓力、流量)也按照其輸入量連續、成比例地進行控制的閥。這類閥的工作性能類似于比例控制閥,但具有較高的動態瞬應和靜態性能,多用于要求較高的、響應快的閉環液壓控制系統。

大型鋼廠現場采用的主要伺服閥如:伺服閥，

1、基本結構：

主閥體（閥芯/閥套）、先導閥（伺服射流管）、電氣控制盒（放大版）

2、工作原理

伺服射流管先導級

射流管先導級主要由力矩馬達、射流管和接收器組成。

當線圈中有電流通過時,產生的電磁力使射流管噴嘴偏離零位,管內的大部分液流集中射向一側的接收器,而另一側接收 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生位移。

先導級的泄漏油通過噴嘴環形區域處的排出通道直接回油箱。

液壓伺服控制系統

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

液壓伺服系統的特點如下:

(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，并和輸入信號進行比較，這就是反饋。在上例中，反饋(檢測時速裝置輸出)電壓和給定(輸入信號)電壓是異號的，即反饋信號不斷地抵消輸入信號，這是負反饋。自動控制系統大多數是負反饋。

(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。液壓缸運動的結果又力圖消除這個誤差。但在伺服系統工作的任何時刻都不能完全消除這一-偏差，伺服系統正是依靠這一-偏差信號進行工作的。

(3)放大。執行元件(液壓缸)輸出的力和功率遠遠大于輸入信號的力和功率，其輸出的能量是液壓能源供給的。

(4)跟進。液壓缸的輸出量完全跟進輸入信號的變化。

電液比例閥是比例控制系統中的主要功率放大元件,按輸入電信號指令連續地成比例地控制液壓系統的壓辦流量等參數。與伺 服控制系統中的伺服閥相比,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),但它顯著的優點是抗污染能力強,大大地減少了由污染而造成的工作故障,提高了液壓系統的工作穩定性和可靠性。另一方面比例閥的成本比伺服閥低，結構也簡單,已在許多場合獲得廣泛應用。

型號 2WRCE…/P and 3WRCE…/P 

高頻響方向閥（塊狀安裝），先導式，帶集成電控器（OBE）和電位反饋

規格32至50

元件系列2X

安裝尺寸按照DIN ISO 7368 (2WRCE型)

適合位置、速度和壓力的閉環控制

通過比例閥控制

結構緊固

通過感應位置監測器對控制閥芯進行位置感應

規格63和80，請詢問本公司

力士樂REXROTH三位三通方向高響應閥，先導操作，電感位置傳感器3WRCBH

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