力士乐内部培训资料2ppt课件.ppt

1,14th15thJanuary2004,BoschRexrothinChina,直动式溢流阀的结构,简单价廉经典结构:缓冲间隙导向,防偏置.偏流盘：流线型泄油口,平衡液动力.将整个调压范围分区，采用不同刚度的调压弹簧，以使特性曲线更加理想大流量的场合压力波动大、装配调节困难,2,14th15thJanuary2004,BoschRexrothinChina,锥阀结构球阀结构,3,14th15thJanuary2004,BoschRexrothinChina,插装式结构：,4,14th15thJanuary2004,BoschRexrothinChina,应用举例：,直动式阀的缺陷：大流量的场合压力波动大、稳定性差装配调节困难,5,14th15thJanuary2004,BoschRexrothinChina,先导式溢流阀的基本原理,由直动式的缺陷而来.液压力与弹簧力;液压力与液压力液压半桥,6,14th15thJanuary2004,BoschRexrothinChina,先导式溢流阀的结构,7,14th15thJanuary2004,BoschRexrothinChina,8,14th15thJanuary2004,BoschRexrothinChina,泄荷阀：,9,14th15thJanuary2004,BoschRexrothinChina,泄荷阀的泄荷缓冲板,利用电信号泄荷响应很快，易造成系统的压力尖峰，噪音等，为了解决上述问题，加装缓冲板，见图示,10,14th15thJanuary2004,BoschRexrothinChina,多级调压模块：DB3U,11,14th15thJanuary2004,BoschRexrothinChina,ForconstantpumpForvariablepump,relationshiptoDR-control.Softoperation,unloadingstart.(与DBW相同）,12,14th15thJanuary2004,BoschRexrothinChina,13,14th15thJanuary2004,BoschRexrothinChina,直动式三通减压阀的结构,14,14th15thJanuary2004,BoschRexrothinChina,应用举例,15,14th15thJanuary2004,BoschRexrothinChina,16,14th15thJanuary2004,BoschRexrothinChina,先导式减压阀的结构(两通式）,17,14th15thJanuary2004,BoschRexrothinChina,先导式、滑阀结构、三通减压阀,力士乐独特设计大通径3通减压阀最大流量400l/min.,18,14th15thJanuary2004,BoschRexrothinChina,先导式、滑阀结构、三通减压阀,19,14th15thJanuary2004,BoschRexrothinChina,20,14th15thJanuary2004,BoschRexrothinChina,21,14th15thJanuary2004,BoschRexrothinChina,顺序阀,利用压力来控制油路的通断，相当于一个液控的二位二通的方向阀。与溢流阀类似，只是后接工作油路，一般控制油需外泄。,22,14th15thJanuary2004,BoschRexrothinChina,先导式顺序阀的结构,先导控制油经4.1作用于阀芯5,来改变主阀芯上腔的压力,23,14th15thJanuary2004,BoschRexrothinChina,卸荷溢流阀的结构和工作原理,先导阀一次开启通过球阀9;此时阀杆6处于力平衡状态,开启后,主阀上腔压力下降.二次保持通过顶杆6;此时,顶杆6一侧卸荷;顶杆6的作用面积比球阀的作用面积大10%或17%.,24,14th15thJanuary2004,BoschRexrothinChina,25,14th15thJanuary2004,BoschRexrothinChina,26,14th15thJanuary2004,BoschRexrothinChina,27,14th15thJanuary2004,BoschRexrothinChina,流量控制阀,分类：节流阀调速阀分流集流阀刹车阀(平衡阀)防管路爆破阀（限速切断阀）,28,14th15thJanuary2004,BoschRexrothinChina,节流阀,MG/MK630,29,14th15thJanuary2004,BoschRexrothinChina,MK-52102,30,14th15thJanuary2004,BoschRexrothinChina,节流阀,31,14th15thJanuary2004,BoschRexrothinChina,精密节流阀F-510,32,14th15thJanuary2004,BoschRexrothinChina,双节流阀,33,14th15thJanuary2004,BoschRexrothinChina,调速阀:,原理:节流调速:与负载有关,期望达到与负载无关的效果,即:如何使p保持恒定!,34,14th15thJanuary2004,BoschRexrothinChina,结构举例：,35,14th15thJanuary2004,BoschRexrothinChina,结构举例：,36,14th15thJanuary2004,BoschRexrothinChina,应用举例：,37,14th15thJanuary2004,BoschRexrothinChina,启动冲击：,油液压缩量,启动冲击,后果：刀具折断系统冲击,起始阶段的“启动阶跃”问题：由于其中的定差减压阀为常开，所以，突然启动时，全压差作用于全开的阀口；从而引起“启动阶跃”效应；另外，负载阶跃变化时，由于定差减压阀响应滞后，对于性能较差的元件也会产生类似现象！改善办法：利用阀上预留的外接平衡孔。（见回路图举例）,38,14th