先導式溢流閥DB20K2-1X/315XY，力士樂REXROTH溢流閥，上海韋米機電設備有限公司主要優(yōu)勢供應產(chǎn)品，銷售熱線： ，聯(lián)系人：雷青，移動熱線： 。熱誠歡迎新來客戶咨詢購買！

 

先導溢流閥的主閥上腔壓力，是由先導閥加于控制的。如果先導閥正常工作，即主閥上腔有先導閥規(guī)定的壓力，則整個溢流閥就會在系統(tǒng)壓力到達調(diào)定壓力時其主閥口打開一定的開度，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)的壓力為先導閥的調(diào)定值。可見，先導閥主要管壓力，主閥服從先導閥的領導，在先導閥動作時將主閥口開到合適大小，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關(guān)閥某些特點的新型閥。比例閥與伺服閥相比具有能量損耗小，對油液過濾精度要求低，價格適中等優(yōu)點，因而逐步在國內(nèi)鍛壓機械上得到推廣應用。
在板料折彎機上應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機的折彎壓力；比例調(diào)速閥主要用作控制板料折彎機滑塊的同步和進深。比例閥在板料折彎機上應用時常與計算機控制技術(shù)相結(jié)合，成為電液比例控制同步的數(shù)控板料折彎機，即液壓同步數(shù)控板料折彎機。
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先導式溢流閥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。
當通過計算機鍵盤輸入被折板料的抗拉強度，厚度，長度以及下模V型槽開口寬度后，計算機按折彎力計算公式求得所需折彎力，經(jīng)數(shù)模轉(zhuǎn)換后，通過控制比例溢流閥的電控器，向比例溢流閥輸入適當?shù)碾娏髦担瑥亩�達到控制折彎力大小的目的。板料折彎機所需*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相對應，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環(huán)，如接入壓力傳感器，可進行閉環(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。板料折彎機在負載或者偏載工況下，要求滑塊在工作速度折彎工件時，始終與工作臺保持平行運動，稱為同步。采用計算機控制的電液比例同步控制系統(tǒng)由工業(yè)控制微型計算機，光柵檢測裝置，比例調(diào)速閥等器件組成。
先導式溢流閥DB20K2-1X/315XY
力士樂REXROTH先導式溢流閥DB...5X/...XC
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