REXROTH比例減壓閥、Rexroth蓄能器、電磁閥

REXROTH力士樂比例閥一般采用兩端承壓面積不等的差徑活塞結(jié)構(gòu)。比例閥不工作時(shí)，差徑活塞2在彈簧3的作用下處于上極限位置，此時(shí)閥門1保持開啟，因而在輸入控制壓力P1與輸出壓力P2從零同步增長的初始階段，總是P1等于P2。但是壓力P1的作用面積A1為π（D2-d2）/4，壓力P2的作用面積A2為πD2/4，因而A2大于A1，故活塞上方液壓作用力大于活塞下方液壓作用力。在P1、P2同步增長過程中，當(dāng)活塞上、下兩端液壓作用之差超過彈簧3的預(yù)緊力時(shí)，活塞便開始下移。當(dāng)P1和P2增長到一定值PS時(shí)活塞2內(nèi)腔中的閥座與閥門1接觸，進(jìn)油腔與出油腔即為隔絕，使比例閥進(jìn)入平衡狀態(tài)。若進(jìn)一步提高P1則活塞將回升，閥門再度開啟，油液繼續(xù)流入出油腔而使P2不斷升高，但由于A2大于A1，P2尚未增長到新的P1值，活塞又下降到平衡位置。在任一平衡狀態(tài)下，差徑活塞的力的平衡方程為：P2路A2=P1路A1+F（此處F為平衡狀態(tài)下的彈簧力）
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REXROTH比例減壓閥、Rexroth蓄能器、電磁閥

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REXROTH比例減壓閥、Rexroth蓄能器、電磁閥

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它是工程機(jī)械分配閥的更新?lián)Q代產(chǎn)品。出于制造成本的考慮和工程機(jī)械控制精度要求不高的特點(diǎn)，一般比例多路閥內(nèi)不配置位移感應(yīng)傳感器，也不具有電子檢測和糾錯(cuò)功能。所以，閥芯位移量容易受負(fù)載變化引起的壓力波動(dòng)的影響，操作過程中要靠視覺觀察來保證作業(yè)的完成。在電控、遙控操作時(shí)更應(yīng)注意外界干涉的影響。近來，由于電子技術(shù)的發(fā)展，人們?cè)絹碓蕉嗟夭捎脙?nèi)裝的差動(dòng)變壓器（ＬＤＶＴ）等位移傳感器構(gòu)成閥芯位置移動(dòng)的檢測，實(shí)現(xiàn)閥芯位移閉環(huán)控制。這種由電磁比例閥、位置反饋傳感器、驅(qū)動(dòng)放大器和其它電子電路組成的高度集成的比例閥，具有一定的校正功能，可以有效地克服一般比例閥的缺點(diǎn)，使控制精度得到較大提高。
REXROTH比例減壓閥、Rexroth蓄能器、電磁閥

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