下載威格士VICKERS換向閥的技術(shù)文章
VICKERS電磁換向閥出來的先導(dǎo)油控制主換向閥閥芯的移動(dòng)，使工作泵的來油進(jìn)入動(dòng)臂油缸實(shí)現(xiàn)動(dòng)臂上升。比例先導(dǎo)減壓閥的輸出壓力越大，控制主換向閥閥芯的位移越大，主換向閥通過的流量越大，動(dòng)臂上升的速度越快。當(dāng)操作手柄拉限位置時(shí)，手柄中的限位電磁鐵通電，手柄在極限位置被吸合。動(dòng)臂以zui大的速度上升，當(dāng)升至動(dòng)臂上位限位開關(guān)所限定的位置時(shí)，操作手柄限位電磁鐵斷電，手柄自動(dòng)恢復(fù)到中位，動(dòng)臂就可保持在所限定的位置。在動(dòng)臂上升的過程中，若需要?jiǎng)颖墼谀骋晃恢猛Ａ簦瑒t需將操作手柄退回中位。
VICKERS電磁換向閥主要用在電氣液壓伺服系統(tǒng)中作為執(zhí)行元件(見液壓伺服系統(tǒng))。在伺服系統(tǒng)中，液壓執(zhí)行機(jī)構(gòu)同電氣及氣動(dòng)執(zhí)行機(jī)構(gòu)相比，具有快速性好、單位重量輸出功率大、傳動(dòng)平穩(wěn)、抗*力強(qiáng)等特點(diǎn)。另一方面，在伺服系統(tǒng)中傳遞信號(hào)和校正特性時(shí)多用電氣元件。因此，現(xiàn)代高性能的伺服系統(tǒng)也都采用電液方式，伺服閥就是這種系統(tǒng)的必需元件。
美國VICKERS威格士比例換向閥*型號(hào)
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