先導(dǎo)式溢流閥DB20K2-1X/315XY，力士樂(lè)REXROTH溢流閥，上海韋米機(jī)電設(shè)備有限公司主要優(yōu)勢(shì)供應(yīng)產(chǎn)品，銷(xiāo)售熱線(xiàn)： ，聯(lián)系人：雷青，移動(dòng)熱線(xiàn)： 。熱誠(chéng)歡迎新來(lái)客戶(hù)咨詢(xún)購(gòu)買(mǎi)！

 

先導(dǎo)溢流閥的主閥上腔壓力，是由先導(dǎo)閥加于控制的。如果先導(dǎo)閥正常工作，即主閥上腔有先導(dǎo)閥規(guī)定的壓力，則整個(gè)溢流閥就會(huì)在系統(tǒng)壓力到達(dá)調(diào)定壓力時(shí)其主閥口打開(kāi)一定的開(kāi)度，一方面能將系統(tǒng)多余流量流回油箱，另一方面又能維持系統(tǒng)的壓力為先導(dǎo)閥的調(diào)定值。可見(jiàn)，先導(dǎo)閥主要管壓力，主閥服從先導(dǎo)閥的領(lǐng)導(dǎo)，在先導(dǎo)閥動(dòng)作時(shí)將主閥口開(kāi)到合適大小，正好將多余流量流出去，又不影響系統(tǒng)壓力。

比例閥是一種具有伺服閥和開(kāi)關(guān)閥某些特點(diǎn)的新型閥。比例閥與伺服閥相比具有能量損耗小，對(duì)油液過(guò)濾精度要求低，價(jià)格適中等優(yōu)點(diǎn)，因而逐步在國(guó)內(nèi)鍛壓機(jī)械上得到推廣應(yīng)用。
在板料折彎?rùn)C(jī)上應(yīng)用的比例閥主要是比例溢流閥和比例調(diào)速閥。比例溢流閥一般控制板料折彎?rùn)C(jī)的折彎壓力；比例調(diào)速閥主要用作控制板料折彎?rùn)C(jī)滑塊的同步和進(jìn)深。比例閥在板料折彎?rùn)C(jī)上應(yīng)用時(shí)常與計(jì)算機(jī)控制技術(shù)相結(jié)合，成為電液比例控制同步的數(shù)控板料折彎?rùn)C(jī)，即液壓同步數(shù)控板料折彎?rùn)C(jī)。
先導(dǎo)式溢流閥DB20K2-1X/315XY
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力士樂(lè)REXROTH先導(dǎo)式溢流閥DBW…W65
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先導(dǎo)式溢流閥DB20K2-1X/315XY


比例溢流閥的壓力控制閥
比例溢流閥的特點(diǎn)是調(diào)定的壓力與輸入電流大小成正比，即輸入的電流大，調(diào)定的壓力高。
當(dāng)通過(guò)計(jì)算機(jī)鍵盤(pán)輸入被折板料的抗拉強(qiáng)度，厚度，長(zhǎng)度以及下模V型槽開(kāi)口寬度后，計(jì)算機(jī)按折彎力計(jì)算公式求得所需折彎力，經(jīng)數(shù)模轉(zhuǎn)換后，通過(guò)控制比例溢流閥的電控器，向比例溢流閥輸入適當(dāng)?shù)碾娏髦担瑥亩�達(dá)到控制折彎力大小的目的。板料折彎?rùn)C(jī)所需*小折彎力和允許的*大折彎力要與比例溢流閥的壓力特征曲線(xiàn)相對(duì)應(yīng)，并且使調(diào)定的壓力稍大于所需折彎力，以利于板料的順利折彎。
比例溢流閥的壓力控制一般為開(kāi)環(huán)，如接入壓力傳感器，可進(jìn)行閉環(huán)控制。

比例調(diào)速閥的同步控制
比例調(diào)速閥的特點(diǎn)是調(diào)定的流量與輸入電流大小成比例。即輸入電流大，調(diào)定的流量也大。板料折彎?rùn)C(jī)在負(fù)載或者偏載工況下，要求滑塊在工作速度折彎工件時(shí)，始終與工作臺(tái)保持平行運(yùn)動(dòng)，稱(chēng)為同步。采用計(jì)算機(jī)控制的電液比例同步控制系統(tǒng)由工業(yè)控制微型計(jì)算機(jī)，光柵檢測(cè)裝置，比例調(diào)速閥等器件組成。
先導(dǎo)式溢流閥DB20K2-1X/315XY
力士樂(lè)REXROTH先導(dǎo)式溢流閥DB...5X/...XC
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先導(dǎo)式溢流閥DB20K2-1X/315XY