上海韦米机电设备有限公司

4WRA10EA00-2X/G24K4/V-872 REXROTH比例阀由上海韦米机电设备有限公司有经验提供

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4WRA10EA00-2X/G24K4/V-872 REXROTH比例阀

比例阀是一种按输入的电信号连续地、按比例地控制液压系统的液流方向、流量和压力的阀类。它山电-机械比例转换装置和液压控制阀本体两大部分构成.前者将输入的电信号连续地按比例地转换为机械力和位移输出，后者在接受这种机械力和位移之后、按比例连续地输出压力和流量.

特点

1)可实现压力、速度的无较调节，避免了常通的开关式气阀换向时的冲击现象。

2)能实现远程控制和程序控制。

3)与断续控制相比，系统简化，元件大大减少。

4)与液压比例阀相比，体积小、重量轻、结构简单、成本较低，但响应速度比液压系统慢得多，对负载变化也比较敏感。

5)使用功率小、发热少、噪声低。

6)不会发生火灾，不污染环境。受温度变化的影响小。

比例溢流阀

1)比例环节

比例环节也称为无惯性环节,对液压缸或马达，忽略液压油的可压缩性和泄漏,液压缸的流量Q= VA。其中V为活塞速度;A为活塞面积。其传递函数为: g(s)= V (s)/Q(s)= 1/A =式中K为比例环节放大系数或增益,表示输入量经过放大K倍后输出。

(2)比例控制系统

比例控制系统根据有无反馈分为开环控制和闭环控制。如比例阀控制液压缸或马达系统可以实现速度位移转速和转矩等的控制。

由于开环控制系统的精度比较低,无级调节系统输入量就可以无级调节系统输出量力速度以及加减速度等。这种控制系统的结构组成简单,系统的输出端和输入端不存在反馈回路,系统输出量对系统输入控制作用没有影响,没有自动纠正偏差的能力,其控制精度主要取决于关键元器件的特性和系统调整精度，所以只能应用在精度要求不高并且不存在内外干扰的场合。开环控制系统一.般不存在所谓稳定性问题。

闭环控制系统(即反馈控制系统)的优点是对内部和外部干扰不敏感，系统工作原理是反馈控制原理或按偏差调整原理。这种控制系统有通

过负反馈控制自动纠正偏差的能力。但反馈带来了系统的稳定性问题，只要系统稳定，闭环控制系统可以保持较高的精度。因此, 目前普遍采用闭环控制系统。

力士乐REXROTH比例方向阀

力士乐REXROTH比例方向阀，直动式

力士乐REXROTH二位四通和三位四通比例方向阀直控式，阀芯不带位移电反馈，不带集成式放大版（OBE）4WRA

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力士乐REXROTH二位四通和三位四通比例方向阀直控式，阀芯不带位移电反馈，带集成式放大版（OBE）4WRAE

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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。

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R901290623 4WRAE6W15-2X/G24N9K31/A1V-280

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R900914844 4WRAE6W30-2X/G24N9Z31/A1V-612

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R900783251 4WRAE6WA07-2X/G24K31/F1V

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R900901182 4WRAE6WA15-2X/G24N9K31/F1V

R900905675 4WRAE6WA15-2X/G24N9Z31/A1V

R900954082 4WRAE6WA30-2X/G24K31/A1V

R901100348 4WRAE6WA30-2X/G24K31/F1V

R900962407 4WRAE6WA30-2X/G24N9K31/A1V

R900752021 4WRAE6WA30-2X/G24N9K31/F1V

R900903760 4WRAE6WA30-2X/G24N9Z31/A1V

R901170924 4WRAE6WB07-2X/G24N9K31/F1V

R900913647 4WRAE6WB15-2X/G24N9K31/A1V

R901239200 4WRAE6WB15-2X/G24N9K31/F1V

R900941851 4WRAE6WB30-2X/G24N9K31/A1V

力士乐REXROTH比例方向阀，直控式4WRA ...XE

R901158548 4WRA6E07-2X/G24XEJ/V

R901097419 4WRA6E15-2X/G24XEJ/V

R901154863 4WRA6E30-2X/G24XEJ/V

R901254509 4WRA6EA03-2X/G24XEJ/V

R901262600 4WRA6EA07-2X/G24XEJ/V

R901393419 4WRA6EA15-2X/G24XEJ/V

R901173051 4WRA6EA30-2X/G24XEJ/V

R901271117 4WRA6EB07-2X/G24XEJ/V

R901061252 4WRA6W07-2X/G24XEJ/V

R901368290 4WRA6W1-07-2X/G24XEJ/V

R901066698 4WRA6W1-15-2X/G24XEJ/V

R901028052 4WRA6W1-30-2X/G24XEJ/V

R901177023 4WRA6W15-2X/G24XEJ/V

R901053397 4WRA6W30-2X/G24XEJ/V

R901123241 4WRA6WA30-2X/G24XEJ/V

力士乐REXROTH二位四通和三位四通比例方向阀直控式，阀芯带位移电反馈，不带集成式放大版（OBE）4WRE

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R900726605 4WRE10E1-25-2X/G24K4/V

R900954103 4WRE10E1-50-2X/G24K4/V

R900954104 4WRE10E1-75-2X/G24K4/V

R902435414 4WRE10E25-2X/24Z4/V-93

R900954100 4WRE10E25-2X/G24K4/V

R902650773 4WRE10E25-2X/G24K4V-93

R901048036 4WRE10E3-75-2X/G24K4/V

R900954101 4WRE10E50-2X/G24K4/V

R900954102 4WRE10E75-2X/G24K4/V

R901039213 4WRE10EA25-2X/G24K4/V

R900752971 4WRE10EA50-2X/G24K4/V

R900969351 4WRE10EA75-2X/G24K4/V

R900703186 4WRE10EB50-2X/G24K4/V

R901151585 4WRE10V1-25-2X/G24K4/V

R901415922 4WRE10V1-50-2X/G24K4/M

R901017446 4WRE10V1-50-2X/G24K4/V

R901414444 4WRE10V1-75-2X/G24K4/V

R900954115 4WRE10V25-2X/G24K4/V

R900954116 4WRE10V50-2X/G24K4/V

R901236220 4WRE10V50-2X=G24K4/V

R900954117 4WRE10V75-2X/G24K4/V

R900974152 4WRE10W1-25-2X/G24K4/V

R900954113 4WRE10W1-50-2X/G24K4/V

R900954114 4WRE10W1-75-2X/G24K4/V

R900954105 4WRE10W25-2X/G24K4/V

R900608420 4WRE10W3-75-2X/G24K4/V

R900954106 4WRE10W50-2X/G24K4/V

R900954107 4WRE10W75-2X/G24K4/V

R901436393 4WRE10WA25-2X/G24K4/V

R901086329 4WRE10WA50-2X/G24K4/V

R901030897 4WRE10WA75-2X/G24K4/V

R901339372 4WRE10WB75-2X/G24K4/V

R901031274 4WRE6E04-2X/G24K4/V

R900933478 4WRE6E08-2X/G24K4/V

R900968149 4WRE6E1-08-2X/G24K4/V

R900954093 4WRE6E1-16-2X/G24K4/V

R900954094 4WRE6E1-32-2X/G24K4/V

R900954092 4WRE6E16-2X/G24K4/V

R900926366 4WRE6E32-2X/G24K4/V

R900783105 4WRE6EA08-2X/G24K4/V

R900720198 4WRE6EA16-2X/G24K4/V

R900752799 4WRE6EA32-2X/G24K4/V

R901364823 4WRE6Q2-08-2X/G24K4/V

R900246943 4WRE6V04-2X/G24K4/V

R900954097 4WRE6V08-2X/G24K4/V

R902650793 4WRE6V08-2X/G24K4V-822

R900966805 4WRE6V1-16-2X/G24K4/V

R901403868 4WRE6V16-2X/G24K4/M

R900954098 4WRE6V16-2X/G24K4/V

R902651062 4WRE6V16-2X/G24K4/V-916

R902650794 4WRE6V16-2X/G24K4V-822

R900954099 4WRE6V32-2X/G24K4/V

R901246418 4WRE6W04-2X/G24K4/V

R900941264 4WRE6W08-2X/G24K4/V

R900953729 4WRE6W1-08-2X/G24K4/V

R900954095 4WRE6W1-16-2X/G24K4/V

R901236264 4WRE6W1-16-2X=G24K4/V

R900954096 4WRE6W1-32-2X/G24K4/V

R900775379 4WRE6W1-32-2X/G24K4/V=LB

R900944121 4WRE6W16-2X/G24K4/V

R900773304 4WRE6W16-2X/G24K4/V=LB

R900933480 4WRE6W32-2X/G24K4/V

R901433171 4WRE6W9-32-2X/G24K4/V

R901022178 4WRE6WA08-2X/G24K4/V

R900965434 4WRE6WA16-2X/G24K4/V

R901300969 4WRE6WA16-2X/G24K4/V-303

R901011624 4WRE6WA32-2X/G24K4/V

R902437398 4WRE6V08-2X/G24Z4/V-822

R902437418 4WRE6V16-2X/G24Z4/V-822

R902461723 4WRE6V16-2X/G24Z4/V-916

R902437419 4WRE6V32-2X/G24Z4/V-822

力士乐REXROTH二位四通和三位四通比例方向阀直控式，阀芯带位移电反馈，带集成式放大版（OBE）4WREE

稳压作用：溢流阀串联在回油路上，溢流阀产生背压，运动部件平稳性增加。

系统卸荷作用：在溢流阀的遥控口串接溢小流量的电磁阀，当电磁铁通电时，溢流阀的遥控口通油箱，此时液压泵卸荷。溢流阀此时作为卸荷阀使用。

安全保护作用：系统正常工作时，阀门关闭。只有负载超过规定的较限（系统压力超过调定压力）时开启溢流，进行过载保护，使系统压力不再增加（通常使溢流阀的调定压力比系统高工作压力高10%～20%）。