德國(guó)進(jìn)口力士樂(lè)二級(jí)方向伺服閥,力士樂(lè)4WS(E)2EM... 型閥為電控制二級(jí)伺服方向閥,孔型符合DIN 24 340 A16 形。它們主要用於位置,力和速度控制閉環(huán)。這類閥由一個(gè)電機(jī)械轉(zhuǎn)換器(力矩馬達(dá))(1),一個(gè)液壓放大器(噴嘴擋板原理)(2),一個(gè)閥套(第 2 級(jí))內(nèi)的控制閥芯(3)組成,閥芯通過(guò)一機(jī)械反饋連接到力矩馬達(dá)上。
力士樂(lè)4WS(E)2EM16型四通方向伺服閥在力矩馬達(dá)的線圈(4)輸入一電信號(hào),通過(guò)電樞的*磁鐵(5)產(chǎn)生一個(gè)力,這個(gè)力連到扭矩管(6)上產(chǎn)生一個(gè)扭矩,通過(guò)扭矩管(6)的連桿連接到擋板(7),使其離開(kāi)兩噴嘴(8)之間的中心位置,這樣就導(dǎo)致一個(gè)壓力差,作用於控制閥芯的端面。壓力差使得閥芯移動(dòng),由此壓力腔連到一執(zhí)行器上,同時(shí)另一執(zhí)行器與回油腔連接??刂崎y芯通過(guò)一反饋彈簧(機(jī)械反饋)(9)連到噴嘴擋板和力矩馬達(dá)上??刂崎y芯不斷改變位置,直到反饋彈簧的反饋扭矩和力矩馬達(dá)的電磁轉(zhuǎn)矩相平衡,噴嘴擋板系統(tǒng)的壓差變?yōu)榱?。閥芯的行桯和通過(guò)先導(dǎo)控制閥的流量實(shí)現(xiàn)了閉環(huán)控制,與輸入電信號(hào)成正比。必須注意到,流量由閥的壓力差決定的。
外控電子放大器,型號(hào) 4WS2EM 16-2X/...(另行訂貨)外控電子放大器(伺服放大器),用於控制閥,將模擬輸入信號(hào)(控制量)放大,這使得輸出控制電流能夠驅(qū)動(dòng)閥。內(nèi)置放大器,型號(hào)4WSE2EM16-2X/...和4WSE2ED16-2X/...電子放大器(10)用於模擬輸入信號(hào)的放大,與閥相配套。
它內(nèi)置於力矩馬達(dá)的蓋板內(nèi)。閥的零點(diǎn)位置通過(guò)一外部電位器進(jìn)行調(diào)節(jié)。
4WSE2ED 16-2X/...
這類閥除了通過(guò)反饋彈簧的機(jī)械控制,還有閥芯位置電信號(hào)的採(cǎi)集和控制。閥芯位置通過(guò)一個(gè)感應(yīng)位移傳感器(11)獲得。通過(guò)內(nèi)置放大器(10),位移傳感器信號(hào)與給定值比較。任何可能的控制偏差進(jìn)行電放大,作為一控制信號(hào)傳到力矩馬達(dá)上。有了這個(gè)附加的電反饋,由於電信號(hào)的閉環(huán)放大,使得在小信號(hào)範(fàn)圍內(nèi)有可能比機(jī)械式有更高的動(dòng)態(tài)值。機(jī)械反饋保證了在電力供應(yīng)故障情況下閥芯位於零點(diǎn)。
這類閥只配置內(nèi)置放大器供貨。閥的零點(diǎn)可以通過(guò)外部電位計(jì)進(jìn)行調(diào)節(jié)。
力士樂(lè)4WS(E)2EM16型四通二級(jí)方向伺服閥的全部型號(hào)如下所示:
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力士樂(lè)電液伺服閥,Rexroth方向伺服閥,力士樂(lè)四通伺服閥,Rexrtoh二級(jí)伺服閥,力士樂(lè)成都經(jīng)銷
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力士樂(lè)4WS(E)2EM16型方向伺服閥的特征:用於閉環(huán)位置,力和速度的控制;二級(jí)伺服閥帶機(jī)械或機(jī)械與電反饋;*級(jí)是噴嘴擋板放大器 ;板式連接結(jié)構(gòu): 底板符合:DIN 24 340 A16 型,端口 X 和 Y 參考樣本 RC 45 054(另行訂貨);干扭矩馬達(dá),磁隙間壓力油無(wú)污染;也可用作三通型閥;耐磨損閥芯反饋元件;三種控制方式; 控制:外控電路以歐洲制式或模塊式, (另行訂貨),或閥內(nèi)置電子放大器;閥和電子放大器已調(diào)整和測(cè)試;控制油油泵,不用拆閥可進(jìn)行控制油內(nèi)外形式的供油、 回油切換;可互換控制閥套;*級(jí)的過(guò)濾可利用插頭外部進(jìn)行。Rexroth電控伺服閥,力士樂(lè)4WS(E)2EM16型伺服閥,Rexroth二級(jí)方向伺服閥,力士樂(lè)西南區(qū)總經(jīng)銷