REXROTH管式單向閥S20A1.0 R900420525，德國力士樂管式單向閥，購買進口液壓、氣動、自動化控制工業配件，
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流量控制閥
作用:
依靠改變閥口通流面積(節流口局部阻力)的大小或通流通道的長短來控制流量，從而實現執行元件所要求的運動速度。
類型:
普通節流閥、調速閥、單向節流閥、單向調速閥等。
一、流量控制原理及節流口形式
1、影響流量穩定性的因素
節流口通常有三種基本形式:薄壁小孔、細長小孔和短孔。
(1)壓差對流量的影響。
(2)溫度對流量的影響。
(3)節流口的抗堵塞性。
為保證流量穩定，節流口的形式以薄壁小孔較為理想。
2、節流口的形式
針閥式、偏心槽式、軸向三、角槽式、周向縫隙式、軸向縫隙式
二、普通節流閥
1、結構及工作原理
2、普通節流閥的調速特性
三、單向節流閥
四、調速閥
組成:
普通節流閥+穩壓閥：減壓閥(串接)、溢流閥(并接)
保證節流閥前后壓差基本不變
換向閥是液壓系統中必不可少的方向控制閥，其合理選擇與應用是保證液壓系統正常工作的關鍵。
合理選用三位換向閥的中位機能
三位換向閥中位機能要與液控單向閥匹配
液控單向閥因其良好的單向密封性而廣泛應用于平衡、保壓、鎖緊等回路中，為了保證液控單向閥能夠良好地鎖定，一般采用H型或Y型中位機能的三位換向閥和液控單向閥配合使用。但現場上常出現0型或M型機能換向閥的情況，其鎖定性能當然不會很好。
1.2選用卸荷式中位機能電液換向閥要考慮控制壓力的建立
電液換向閥由電磁換向閥和液動換向閥組成，其中電磁換向閥起先導作用，即用來改變液動換向閥控制壓力油的方向;液動換向閥作為主閥，其工作位置由電磁換向閥的工作位置相應確定。電液換向閥根據控制油和回油方式分為:內控內泄式、內控外泄式、外控內泄式、外控外泄式四種。對于外控式閥，由于控制油是從電液換向閥之外的油路單獨引入的，在使用時，無論內泄還是外泄，均不存在什么問題。對以內控方式供油的電液動換向閥，由于先導閥的供液口與主閥的P口是溝通的，若在中間位置是使泵卸荷的狀態，如M、H、K等中位機能，在中位時主油路不能為控制油路提供主閥芯換向所必須的控制壓力，因此不宜采取這種具有中位卸荷機能的內控式電液換向閥。如果要采取這種形式，在應用時一定注意配以預控壓力閥，使在卸荷狀態仍然具有一定的控制油壓,足以操縱主閥芯換向，否則不能正常工作，即先導閥換向而主閥不能換向。
2、換向閥過渡狀態機能要與系統匹配
換向閥閥芯相對于閥體的工作位置決定了其相應的左位機能、右位機能和中位機能(對于三位閥)。閥芯由一個工作位置向另一個工作位置切換的過程中，還存在著過渡位置，而過渡狀態機能往往容易被忽視而引發許多故障。
3、充分利用換向閥的設計功能
在選擇換向閥時，應盡量減少換向閥的“位’與“通”從而減少系統的復雜性,并降低制造成本,符合技術經濟的要求。在液壓系統中，由于換向閥閥芯的運動間隙較小，而液壓油中存在的污染物易造成換向閥堵塞或卡死，且液壓系統中出現故障不易檢查，如選擇的換向閥存在多余的“位”與“通”，就會增加發生事故的幾率，增加故障查找的難度。
4、避免換向閥動作不同步
液壓系統中經常有多個電磁換向閥控制同一個液壓缸的情況，對二位或三位電磁換向閥來說，存在因換向時間不等而帶來的故障。
5、工作壓力和通流量是確定換向閥規格選擇的依據
換向閥的規格應依據工作壓力和通流量來選擇而實際選用中卻經常會出現按油泵供油量Q來選擇的情況致使通過換向閥的實際流量遠大于該閥的額定流量引起系統故障
6、選用換向閥時不能只注意其位數和通路數滿足系統工作原理的要求更要考慮中位機能過渡位機能這樣一些結構方面的因素以及換向閥的規格多，換向閥動作的相互協調系統的簡化及制造成本等問題否則就會顧此失彼使液壓 系統不能正常工作，甚至出現事故。
REXROTH管式單向閥S20A1.0 R900420525
力士樂REXROTH管式單向閥S6…S30 A..-1X/...
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力士樂REXROTH插裝式單向閥M-SR 6...30
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折彎機是鈑金行業工件折彎成形的重要設備，其作用是將鋼板根據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，液壓系統提供動力，電氣系統給出指令，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，機械擋塊由數控系統控制調節數值；
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，并由數控系統控制移動的距離，其小讀數為0.01毫米（前后位置均有行程開關限位）；
3、同步系統：該機由扭軸、擺臂、關節軸承等組成的機械同步機構，結構簡單，性能穩定可靠，同步精度高。機械擋塊由電機調節，數控系統控制數值；
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，數控系統控制擋料尺寸。
液壓板料折彎機的吊運和安裝
1、液壓板料折彎機整機重心較高，前重后輕，因此在吊運和搬運及安裝過程中必須注意重心位置，以免造成機器翻身事故，吊運時，起吊鋼絲夾角盡量小，以保證機床精度不變。
2、液壓板料折彎機左右立柱處在工作臺面為測量水平的基準處，縱橫方向均應小于或等于1000：0.2，按地基圖預先做好基礎，將液壓板料折彎機安裝在基礎上，同時裝好地腳螺栓，后灌漿，待水泥全部凝固后，緊定螺栓，校對水平。
液壓折彎機壓力的調試
1 液壓折彎機核算壓力是依據板材的搞拉強度核算的。假如你板材功能紛歧樣，固然核算出來一樣，但實踐需求的力天然紛歧樣。
2 假如外界要素一樣，只是液壓折彎機的問題，可以經過兩個當地調整，一是調整系統里面板才的抗拉強度，二是調整系統設置里面的DA值。
液壓折彎機的液壓控制系統對于折彎機本身而言是中樞般的大腦，在折彎機的生產中，要求有高的自動化率和標準化率。因此，液壓系統也限制在液壓控制方式上，這些方式的不同結構型式和原理，已普遍得到市場認可。
1、中央控制塊
中央控制塊形式就是將三個控制塊合成為一個控制塊。它主要應用在某些特殊結構的折彎機中。由于控制的原因，控制塊與兩個沖壓液壓缸間的連接管道必須要對稱布置，而且要保證不超過兩只液壓缸間的大允許間距(約3m)，因此，中央控制塊要盡可能布置在機器的中央。
2、三控制塊
這種款式擁有三個控制塊。兩個帶有所屬的中間板充液閥的主控制塊直接安裝在液壓缸上，實現了主控制塊與液壓缸腔之間的無管道連接。折彎機主控制塊主要由重要的比例換向閥、位置監控換向閥和背壓組件組成。
3、傳感器和軸的接口分配器
中央控制塊在折彎機的應用中，將全部電磁閥都集中在一個控制塊中，同樣地，也將各閥的電連線集中在一條電纜線上，實現了公共連線。為此，在折彎機中央控制塊上也設置了一個接口分配器。
比例閥是一種具有伺服閥和開關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，價格適中等優點，因而逐步在國內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速閥。比例溢流閥一般控制板料折彎機的折彎壓力；比例調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相結合，成為電液比例控制同步的數控板料折彎機，即液壓同步數控板料折彎機。
比例溢流閥的壓力控制閥
比例溢流閥的特點是調定的壓力與輸入電流大小成正比，即輸入的電流大，調定的壓力高。
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，經數模轉換后，通過控制比例溢流閥的電控器，向比例溢流閥輸入適當的電流值，從而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，如接入壓力傳感器，可進行閉環控制。
比例調速閥的同步控制
比例調速閥的特點是調定的流量與輸入電流大小成比例。即輸入電流大，調定的流量也大。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由工業控制微型計算機，光柵檢測裝置，比例調速閥等器件組成。
