企业培训_力士乐内部企业知识管理培训资料

1 14th 15thJanuary2004 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 14th 15thJanuary2004 BoschRexrothinChina 锥阀结构球阀结构 3 14th 15thJanuary2004 BoschRexrothinChina 插装式结构 4 14th 15thJanuary2004 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 14th 15thJanuary2004 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 14th 15thJanuary2004 BoschRexrothinChina 先导式溢流阀的结构 7 14th 15thJanuary2004 BoschRexrothinChina 8 14th 15thJanuary2004 BoschRexrothinChina 泄荷阀 9 14th 15thJanuary2004 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 14th 15thJanuary2004 BoschRexrothinChina 多级调压模块 DB3U 11 14th 15thJanuary2004 BoschRexrothinChina ForconstantpumpForvariablepump relationshiptoDR control Softoperation unloadingstart 与DBW相同 12 14th 15thJanuary2004 BoschRexrothinChina 13 14th 15thJanuary2004 BoschRexrothinChina 直动式三通减压阀的结构 14 14th 15thJanuary2004 BoschRexrothinChina 应用举例 15 14th 15thJanuary2004 BoschRexrothinChina 16 14th 15thJanuary2004 BoschRexrothinChina 先导式减压阀的结构 两通式 17 14th 15thJanuary2004 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 14th 15thJanuary2004 BoschRexrothinChina 先导式 滑阀结构 三通减压阀 19 14th 15thJanuary2004 BoschRexrothinChina 20 14th 15thJanuary2004 BoschRexrothinChina 21 14th 15thJanuary2004 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 14th 15thJanuary2004 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 14th 15thJanuary2004 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 14th 15thJanuary2004 BoschRexrothinChina 25 14th 15thJanuary2004 BoschRexrothinChina 26 14th 15thJanuary2004 BoschRexrothinChina 27 14th 15thJanuary2004 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 14th 15thJanuary2004 BoschRexrothinChina 节流阀 MG MK 6 30 29 14th 15thJanuary2004 BoschRexrothinChina MK 52 102 30 14th 15thJanuary2004 BoschRexrothinChina 节流阀 31 14th 15thJanuary2004 BoschRexrothinChina 精密节流阀F 5 10 32 14th 15thJanuary2004 BoschRexrothinChina 双节流阀 33 14th 15thJanuary2004 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 14th 15thJanuary2004 BoschRexrothinChina 结构举例 35 14th 15thJanuary2004 BoschRexrothinChina 结构举例 36 14th 15thJanuary2004 BoschRexrothinChina 应用举例 37 14th 15thJanuary2004 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 15thJanuary2004 BoschRexrothinChina 调速阀的启动