聯(lián)系電話
參考價: | 面議 |
- 產(chǎn)品型號
- REXROTH/德國力士樂 品牌
- 經(jīng)銷商 廠商性質(zhì)
- 上海市 所在地
訪問次數(shù):615更新時間:2024-10-01 18:45:24
- 聯(lián)系人:
- 鄧潔
- 電話:
- 021-61116911
- 手機:
- 13524123373
- 地址:
- 上海市浦東新區(qū)金豫路100號禹洲金橋國際2期2號樓1017室
- 個性化:
- www.shweimi.com.cn
- 網(wǎng)址:
- www.wei-mi.com
掃一掃訪問手機商鋪
德國Rexroth力士樂伺服閥4WSE2EM10-5X/90B9-315K31DV
電液伺服閥廣泛地應用于電液位置,速度,加速度,力伺服系統(tǒng),以及伺服振動發(fā)生器中.它具有體積小,結(jié)
伺服閥
構(gòu)緊湊,功率放大系數(shù)高,控制精度高,直線性好,死區(qū)小,靈敏度高,動態(tài)性能好以及響應速度快等優(yōu)點.
參考書目 劉長年著《液壓伺服系統(tǒng)的分析與設(shè)計》,科學出版社,北京,1985。
4類型
[1] 防滯伺服活門
該伺服閥屬于兩級閥,*級為噴嘴檔板式,由控制信號控制其出口壓力,第二級為滑閥式,執(zhí)行控制級至剎車缸的壓力。當無信號作用時, 由於壓力噴嘴出口油壓力的作用,使伺服閥擋板靠在回油噴嘴上,此時壓力口的油壓作用在滑閥閥芯上,使剎車口同計量油口直接連通,剎車口壓力同飛行員控制的計量油壓相等,當機輪角速度檢測到滑行速度同基準滑行速度有偏差時,力矩馬達接收到偏差電信號,此時力矩馬達驅(qū)動檔板向壓力噴嘴偏轉(zhuǎn),使作用在閥芯上端油壓下降,在閥芯下端油壓作用下,閥芯上移,關(guān)小計量壓力油口,這將導致控制口壓力降低,控制口壓力降低到某一值時,就有對應的制動壓力。[1]
5空難
1991年3月3日,聯(lián)合航空585號班機為波音737-291型客機,從丹佛機場前往科羅拉多泉機場途中,飛機垂直尾翼的方向舵突然不受控制轉(zhuǎn)向右面,繼而翻滾,之后直墜地面,機上20名乘客和5名機組人員全部遇難。
1994年9月7日,全美航空427號班機為波音737-300型客機,從芝加哥奧黑爾機場前往匹茲堡機場途中,突然不受控制轉(zhuǎn)向,繼而翻滾,之后直墜地面,機上127名乘客和5名機組人員全部遇難。它的墜機方式與聯(lián)合航空585號班機與東風航空517號很相似。其后發(fā)現(xiàn)原來波音737客機的方向舵液壓器在溫差很大時(30,000呎的-50度到地面的30度,同時加入高溫液壓液體時)會卡住,并且會導致飛行員給方向盤控制后由反向偏轉(zhuǎn)的嚴重后果。這種故障不會有磨損過的痕跡,也是NTSB(National Transportation Safety Board)有史以來調(diào)查時間zui長的一系列空難事故之一。這是波音737自運行以來發(fā)現(xiàn)的zui大的致命設(shè)計錯誤(國家地理《空中浩劫》中S04E04中詳述)。
1996年6月9日,東風航空517號班機于準備降落在里奇蒙機場時,飛機突然發(fā)生故障,所幸只有一名空中服務員受輕傷。飛機亦成功降落。
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