REXROTH電磁換向閥4WE6GA62/EG24N9K4

REXROTH電磁換向閥4WE6GA62/EG24N9K4 德國博世力士樂REXROTH電磁閥 電磁換向閥

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REXROTH電磁換向閥4WE6GA62/EG24N9K4

電磁換向閥

工作原理:

利用電磁鐵的通電吸合與斷電釋放而直接推動閥芯來控制液流方向的。

類型:

交流(D,36V或220V或380V)

直流(E,24V或100V )

干式、濕式

交流電磁鐵:使用電壓為交流110、220、380V。特點是啟動力大，不需要專門的電源，吸合、釋放快，動作時間約為0.01 ~0.03s。缺點是電源電壓下降15%以上，電磁鐵吸力明顯減小，若銜鐵不動作，干式電磁鐵會在10~15min (濕式1~1.5h) 后燒壞線圈，且沖擊及噪聲大，壽命低，允許切換頻率為10次1分。

直流電磁鐵:使用電壓為直流110和24V,工作可靠，吸合釋放時間約為0.05~ 0.08s,切換頻率般為120次/分，沖擊小、體積小、壽命長，但需要專門的直流電源，成本高。

交流本整型電磁鐵:電磁鐵是直流的，電磁鐵本身帶整流器，通入交流電經(jīng)整流后再供給直流電磁鐵。

干式電磁鐵:電磁鐵線圈、鐵芯與軛鐵處于空氣中而不和油液接觸。電磁鐵與閥連接時，在推桿處設置密封圈，避免了油液進入電磁鐵，而且裝拆方便。為了防止回油進入干式電磁鐵中，要求換向閥的回油壓力不能太高。

濕式電磁鐵:濕式電磁鐵的推桿與閥芯連成一體,取消了推桿處的動密封，所以摩擦力小，復位性能好，冷卻潤滑好，工作壽命長。

特點:

(1)動作迅速，操作輕便，便于遠距離控制;

(2)因受電磁鐵尺寸與推力的限制，僅能控制小流量(小于63 L (min)的液流;

(3)電磁鐵通斷電需電信號控制:如設備中的按鈕開關、限位開關、行程開關等; 

(4)換向快，易產生液壓沖擊。

折彎機是鈑金行業(yè)工件折彎成形的重要設備，其作用是將鋼板根據(jù)工藝需要壓制成各種形狀的零件。如圖所示為液壓板料折彎機結構示意圖，主要由左右立柱、工作臺、橫梁組成機架，左右油缸固定在立柱上，滑塊與油缸的活塞連接、沿固定在立柱上的導軌上下運動，下模固定在工作臺上，上模安裝在滑塊下端，液壓系統(tǒng)提供動力，電氣系統(tǒng)給出指令，在油缸作用下，滑塊帶動上模向下與下模閉合實現(xiàn)板料的折彎。左右立柱、工作臺和滑塊（以下簡稱三大件）是折彎機的關鍵零件，三大件的重量之和占一臺折彎機總重量的70%~80%。其強度和剛性直接決定機床的運行精度、使用壽命，以及工件的精度。

1、滑塊部分：采用液壓傳動，滑塊部分由滑塊、油缸及機械擋塊微調結構組成。左右油缸固定在機架上，通過液壓使活塞（桿）帶動滑塊上下運動，機械擋塊由數(shù)控系統(tǒng)控制調節(jié)數(shù)值；

2、工作臺部分：由按鈕盒操縱，使電動機帶動擋料架前后移動，并由數(shù)控系統(tǒng)控制移動的距離，其小讀數(shù)為0.01毫米（前后位置均有行程開關限位）；

3、同步系統(tǒng)：該機由扭軸、擺臂、關節(jié)軸承等組成的機械同步機構，結構簡單，性能穩(wěn)定可靠，同步精度高。機械擋塊由電機調節(jié)，數(shù)控系統(tǒng)控制數(shù)值；

4、擋料機構：擋料采用電機傳動，通過鏈操帶動兩絲桿同步移動，數(shù)控系統(tǒng)控制擋料尺寸。

WE型換向閥是由電磁鐵控制的滑閥式換向閥，它主要用于控制液體的通斷和流動方向。

其結構主要是由閥體、電磁鐵、滑閥以及復位彈簧等組成。在不通電的情況下被復位彈簧保持在中間位置或初始位置上(脈沖閥除外)。電磁鐵的推力通過推桿作用在滑閥上，并且把它從靜止位置推到工作位置上(終端位置)，由此改變了液流的方向P→A和B→T或者P→B和A→T。當電磁鐵斷電后，滑閥被復位彈簧重新推到原來的靜止位置上。在電磁鐵斷電時，用故障檢查按鈕推動滑閥移動。

液壓系統(tǒng)電磁閥型號

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汽缸是汽輪機的外殼，其作用是將汽輪機的通流部分與大氣隔開，形成封閉的汽室，保證蒸汽在汽輪機內部完成能量的轉換過程，汽缸內安裝著噴嘴室、隔板、隔板套等零部件；汽缸外連接著進汽、排汽、抽汽等管道。

汽缸的高、中壓段一般采用合金鋼或碳鋼鑄造結構，低壓段可根據(jù)容量和結構要求，采用鑄造結構或由簡單鑄件、型鋼及鋼板焊接的焊接結構。