4WE6E62 REXROTH比例减压阀、Rexroth蓄能器、电磁阀

REXROTH比例减压阀、Rexroth蓄能器、电磁阀

REXROTH力士乐比例阀一般采用两端承压面积不等的差径活塞结构。比例阀不工作时，差径活塞2在弹簧3的作用下处于上极限位置，此时阀门1保持开启，因而在输入控制压力P1与输出压力P2从零同步增长的初始阶段，总是P1等于P2。但是压力P1的作用面积A1为π（D2-d2）/4，压力P2的作用面积A2为πD2/4，因而A2大于A1，故活塞上方液压作用力大于活塞下方液压作用力。在P1、P2同步增长过程中，当活塞上、下两端液压作用之差超过弹簧3的预紧力时，活塞便开始下移。当P1和P2增长到一定值PS时活塞2内腔中的阀座与阀门1接触，进油腔与出油腔即为隔绝，使比例阀进入平衡状态。若进一步提高P1则活塞将回升，阀门再度开启，油液继续流入出油腔而使P2不断升高，但由于A2大于A1，P2尚未增长到新的P1值，活塞又下降到平衡位置。在任一平衡状态下，差径活塞的力的平衡方程为：P2路A2=P1路A1+F（此处F为平衡状态下的弹簧力）
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REXROTH比例减压阀、Rexroth蓄能器、电磁阀

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REXROTH比例减压阀、Rexroth蓄能器、电磁阀

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它是工程机械分配阀的更新换代产品。出于制造成本的考虑和工程机械控制精度要求不高的特点，一般比例多路阀内不配置位移感应传感器，也不具有电子检测和纠错功能。所以，阀芯位移量容易受负载变化引起的压力波动的影响，操作过程中要靠视觉观察来保证作业的完成。在电控、遥控操作时更应注意外界干涉的影响。近来，由于电子技术的发展，人们越来越多地采用内装的差动变压器（ＬＤＶＴ）等位移传感器构成阀芯位置移动的检测，实现阀芯位移闭环控制。这种由电磁比例阀、位置反馈传感器、驱动放大器和其它电子电路组成的高度集成的比例阀，具有一定的校正功能，可以有效地克服一般比例阀的缺点，使控制精度得到较大提高。
REXROTH比例减压阀、Rexroth蓄能器、电磁阀

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