REXROTH電磁換向閥4WE6GA62/EG24N9K4

REXROTH電磁換向閥4WE6GA62/EG24N9K4 德國(guó)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(dòng)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(diǎn)是啟動(dòng)力大，不需要專門的電源，吸合、釋放快，動(dòng)作時(shí)間約為0.01 ~0.03s。缺點(diǎn)是電源電壓下降15%以上，電磁鐵吸力明顯減小，若銜鐵不動(dòng)作，干式電磁鐵會(huì)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(shí)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(zhǎng)，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(shí)，在推桿處設(shè)置密封圈，避免了油液進(jìn)入電磁鐵，而且裝拆方便。為了防止回油進(jìn)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(dòng)密封，所以摩擦力小，復(fù)位性能好，冷卻潤(rùn)滑好，工作壽命長(zhǎng)。

特點(diǎn):

(1)動(dòng)作迅速，操作輕便，便于遠(yuǎn)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(hào)控制:如設(shè)備中的按鈕開關(guān)、限位開關(guān)、行程開關(guān)等; 

(4)換向快，易產(chǎn)生液壓沖擊。

折彎?rùn)C(jī)是鈑金行業(yè)工件折彎成形的重要設(shè)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?rùn)C(jī)結(jié)構(gòu)示意圖，主要由左右立柱、工作臺(tái)、橫梁組成機(jī)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(dǎo)軌上下運(yùn)動(dòng)，下模固定在工作臺(tái)上，上模安裝在滑塊下端，液壓系統(tǒng)提供動(dòng)力，電氣系統(tǒng)給出指令，在油缸作用下，滑塊帶動(dòng)上模向下與下模閉合實(shí)現(xiàn)板料的折彎。左右立柱、工作臺(tái)和滑塊（以下簡(jiǎn)稱三大件）是折彎?rùn)C(jī)的關(guān)鍵零件，三大件的重量之和占一臺(tái)折彎?rùn)C(jī)總重量的70%~80%。其強(qiáng)度和剛性直接決定機(jī)床的運(yùn)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(dòng)，滑塊部分由滑塊、油缸及機(jī)械擋塊微調(diào)結(jié)構(gòu)組成。左右油缸固定在機(jī)架上，通過液壓使活塞（桿）帶動(dòng)滑塊上下運(yùn)動(dòng)，機(jī)械擋塊由數(shù)控系統(tǒng)控制調(diào)節(jié)數(shù)值；

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

3、同步系統(tǒng)：該機(jī)由扭軸、擺臂、關(guān)節(jié)軸承等組成的機(jī)械同步機(jī)構(gòu)，結(jié)構(gòu)簡(jiǎn)單，性能穩(wěn)定可靠，同步精度高。機(jī)械擋塊由電機(jī)調(diào)節(jié)，數(shù)控系統(tǒng)控制數(shù)值；

4、擋料機(jī)構(gòu)：擋料采用電機(jī)傳動(dòng)，通過鏈操帶動(dòng)兩絲桿同步移動(dòng)，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(dòng)方向。

其結(jié)構(gòu)主要是由閥體、電磁鐵、滑閥以及復(fù)位彈簧等組成。在不通電的情況下被復(fù)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(dāng)電磁鐵斷電后，滑閥被復(fù)位彈簧重新推到原來的靜止位置上。在電磁鐵斷電時(shí)，用故障檢查按鈕推動(dòng)滑閥移動(dòng)。

液壓系統(tǒng)電磁閥型號(hào)

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汽缸是汽輪機(jī)的外殼，其作用是將汽輪機(jī)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(jī)內(nèi)部完成能量的轉(zhuǎn)換過程，汽缸內(nèi)安裝著噴嘴室、隔板、隔板套等零部件；汽缸外連接著進(jìn)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(jié)構(gòu)，低壓段可根據(jù)容量和結(jié)構(gòu)要求，采用鑄造結(jié)構(gòu)或由簡(jiǎn)單鑄件、型鋼及鋼板焊接的焊接結(jié)構(gòu)。