REXROTH管式单向阀S20A1.0 R900420525，德国力士乐管式单向阀，购买进口液压、气动、自动化控制工业配件，认准“上海韦米机电设备有限公司”，7年老店，产品实拍，保证产品原厂原装，价格优惠，售后无忧，欢迎新老客户咨询采购！
 
流量控制阀
作用:
依靠改变阀口通流面积(节流口局部阻力)的大小或通流通道的长短来控制流量，从而实现执行元件所要求的运动速度。
类型:
普通节流阀、调速阀、单向节流阀、单向调速阀等。
一、流量控制原理及节流口形式
1、影响流量稳定性的因素
节流口通常有三种基本形式:薄壁小孔、细长小孔和短孔。
(1)压差对流量的影响。
(2)温度对流量的影响。
(3)节流口的抗堵塞性。
为保证流量稳定，节流口的形式以薄壁小孔较为理想。
2、节流口的形式
针阀式、偏心槽式、轴向三、角槽式、周向缝隙式、轴向缝隙式
二、普通节流阀
1、结构及工作原理
2、普通节流阀的调速特性
三、单向节流阀
四、调速阀
组成:
普通节流阀+稳压阀：减压阀(串接)、溢流阀(并接)
保证节流阀前后压差基本不变

换向阀是液压系统中必不可少的方向控制阀，其合理选择与应用是保证液压系统正常工作的关键。
合理选用三位换向阀的中位机能
三位换向阀中位机能要与液控单向阀匹配
液控单向阀因其良好的单向密封性而广泛应用于平衡、保压、锁紧等回路中，为了保证液控单向阀能够良好地锁定，一般采用H型或Y型中位机能的三位换向阀和液控单向阀配合使用。但现场上常出现0型或M型机能换向阀的情况，其锁定性能当然不会很好。
1.2选用卸荷式中位机能电液换向阀要考虑控制压力的建立
电液换向阀由电磁换向阀和液动换向阀组成，其中电磁换向阀起先导作用，即用来改变液动换向阀控制压力油的方向;液动换向阀作为主阀，其工作位置由电磁换向阀的工作位置相应确定。电液换向阀根据控制油和回油方式分为:内控内泄式、内控外泄式、外控内泄式、外控外泄式四种。对于外控式阀，由于控制油是从电液换向阀之外的油路单独引入的，在使用时，无论内泄还是外泄，均不存在什么问题。对以内控方式供油的电液动换向阀，由于先导阀的供液口与主阀的P口是沟通的，若在中间位置是使泵卸荷的状态，如M、H、K等中位机能，在中位时主油路不能为控制油路提供主阀芯换向所必须的控制压力，因此不宜采取这种具有中位卸荷机能的内控式电液换向阀。如果要采取这种形式，在应用时一定注意配以预控压力阀，使在卸荷状态仍然具有一定的控制油压,足以操纵主阀芯换向，否则不能正常工作，即先导阀换向而主阀不能换向。
2、换向阀过渡状态机能要与系统匹配
换向阀阀芯相对于阀体的工作位置决定了其相应的左位机能、右位机能和中位机能(对于三位阀)。阀芯由一个工作位置向另一个工作位置切换的过程中，还存在着过渡位置，而过渡状态机能往往容易被忽视而引发许多故障。
3、充分利用换向阀的设计功能
在选择换向阀时，应尽量减少换向阀的“位’与“通”从而减少系统的复杂性,并降低制造成本,符合技术经济的要求。在液压系统中，由于换向阀阀芯的运动间隙较小，而液压油中存在的污染物易造成换向阀堵塞或卡死，且液压系统中出现故障不易检查，如选择的换向阀存在多余的“位”与“通”，就会增加发生事故的几率，增加故障查找的难度。
4、避免换向阀动作不同步
液压系统中经常有多个电磁换向阀控制同一个液压缸的情况，对二位或三位电磁换向阀来说，存在因换向时间不等而带来的故障。
5、工作压力和通流量是确定换向阀规格选择的依据
换向阀的规格应依据工作压力和通流量来选择而实际选用中却经常会出现按油泵供油量Q来选择的情况致使通过换向阀的实际流量远大于该阀的额定流量引起系统故障
6、选用换向阀时不能只注意其位数和通路数满足系统工作原理的要求更要考虑中位机能过渡位机能这样一些结构方面的因素以及换向阀的规格多，换向阀动作的相互协调系统的简化及制造成本等问题否则就会顾此失彼使液压 系统不能正常工作，甚至出现事故。
REXROTH管式单向阀S20A1.0 R900420525
力士乐REXROTH管式单向阀S6…S30 A..-1X/...
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力士乐REXROTH截止阀S52...S150
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力士乐REXROTH插装式单向阀M-SR 6...30
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折弯机是钣金行业工件折弯成形的重要设备，其作用是将钢板根据工艺需要压制成各种形状的零件。如图所示为液压板料折弯机结构示意图，主要由左右立柱、工作台、横梁组成机架，左右油缸固定在立柱上，滑块与油缸的活塞连接、沿固定在立柱上的导轨上下运动，下模固定在工作台上，上模安装在滑块下端，液压系统提供动力，电气系统给出指令，在油缸作用下，滑块带动上模向下与下模闭合实现板料的折弯。左右立柱、工作台和滑块（以下简称三大件）是折弯机的关键零件，三大件的重量之和占一台折弯机总重量的70%~80%。其强度和刚性直接决定机床的运行精度、使用寿命，以及工件的精度。
1、滑块部分：采用液压传动，滑块部分由滑块、油缸及机械挡块微调结构组成。左右油缸固定在机架上，通过液压使活塞（杆）带动滑块上下运动，机械挡块由数控系统控制调节数值；
2、工作台部分：由按钮盒操纵，使电动机带动挡料架前后移动，并由数控系统控制移动的距离，其小读数为0.01毫米（前后位置均有行程开关限位）；
3、同步系统：该机由扭轴、摆臂、关节轴承等组成的机械同步机构，结构简单，性能稳定可靠，同步精度高。机械挡块由电机调节，数控系统控制数值；
4、挡料机构：挡料采用电机传动，通过链操带动两丝杆同步移动，数控系统控制挡料尺寸。


液压板料折弯机的吊运和安装
1、液压板料折弯机整机重心较高，前重后轻，因此在吊运和搬运及安装过程中必须注意重心位置，以免造成机器翻身事故，吊运时，起吊钢丝夹角尽量小，以保证机床精度不变。
2、液压板料折弯机左右立柱处在工作台面为测量水平的基准处，纵横方向均应小于或等于1000：0.2，按地基图预先做好基础，将液压板料折弯机安装在基础上，同时装好地脚螺栓，后灌浆，待水泥全部凝固后，紧定螺栓，校对水平。
液压折弯机压力的调试
1 液压折弯机核算压力是依据板材的搞拉强度核算的。假如你板材功能纷歧样，固然核算出来一样，但实践需求的力天然纷歧样。
2 假如外界要素一样，只是液压折弯机的问题，可以经过两个当地调整，一是调整系统里面板才的抗拉强度，二是调整系统设置里面的DA值。

液压折弯机的液压控制系统对于折弯机本身而言是中枢般的大脑，在折弯机的生产中，要求有高的自动化率和标准化率。因此，液压系统也限制在液压控制方式上，这些方式的不同结构型式和原理，已普遍得到市场认可。
1、中央控制块
中央控制块形式就是将三个控制块合成为一个控制块。它主要应用在某些特殊结构的折弯机中。由于控制的原因，控制块与两个冲压液压缸间的连接管道必须要对称布置，而且要保证不超过两只液压缸间的大允许间距(约3m)，因此，中央控制块要尽可能布置在机器的中央。
2、三控制块
这种款式拥有三个控制块。两个带有所属的中间板充液阀的主控制块直接安装在液压缸上，实现了主控制块与液压缸腔之间的无管道连接。折弯机主控制块主要由重要的比例换向阀、位置监控换向阀和背压组件组成。
3、传感器和轴的接口分配器
中央控制块在折弯机的应用中，将全部电磁阀都集中在一个控制块中，同样地，也将各阀的电连线集中在一条电缆线上，实现了公共连线。为此，在折弯机中央控制块上也设置了一个接口分配器。


比例阀是一种具有伺服阀和开关阀某些特点的新型阀。比例阀与伺服阀相比具有能量损耗小，对油液过滤精度要求低，价格适中等优点，因而逐步在国内锻压机械上得到推广应用。
在板料折弯机上应用的比例阀主要是比例溢流阀和比例调速阀。比例溢流阀一般控制板料折弯机的折弯压力；比例调速阀主要用作控制板料折弯机滑块的同步和进深。比例阀在板料折弯机上应用时常与计算机控制技术相结合，成为电液比例控制同步的数控板料折弯机，即液压同步数控板料折弯机。

比例溢流阀的压力控制阀
比例溢流阀的特点是调定的压力与输入电流大小成正比，即输入的电流大，调定的压力高。
当通过计算机键盘输入被折板料的抗拉强度，厚度，长度以及下模V型槽开口宽度后，计算机按折弯力计算公式求得所需折弯力，经数模转换后，通过控制比例溢流阀的电控器，向比例溢流阀输入适当的电流值，从而达到控制折弯力大小的目的。板料折弯机所需小折弯力和允许的大折弯力要与比例溢流阀的压力特征曲线相对应，并且使调定的压力稍大于所需折弯力，以利于板料的顺利折弯。
比例溢流阀的压力控制一般为开环，如接入压力传感器，可进行闭环控制。

比例调速阀的同步控制
比例调速阀的特点是调定的流量与输入电流大小成比例。即输入电流大，调定的流量也大。板料折弯机在负载或者偏载工况下，要求滑块在工作速度折弯工件时，始终与工作台保持平行运动，称为同步。采用计算机控制的电液比例同步控制系统由工业控制微型计算机，光栅检测装置，比例调速阀等器件组成。