韦米机电供应四位四通伺服电磁阀4WRPEH6C3B25P-30/M/24A1,上海韦米机电设备有限公司供应产品,德国力士乐REXROTH比例阀,现货库存,价格优惠;
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。
(1)根据用途和被控对象选择比例阀的类型;
(2)正确了解比例阀的动静态指标主要有额定输出流量、起始电流滞环重复精度额定压力损失温飘、响应特性频率特性等;
(3)根据执行器的工作精度要求选择比例阀的精度,内含反馈闭环阀的稳态性动态品质好。如果比例阀的固有特性如滞环非线性等无法使被控系统达到理想的效果时,可以使用软件程序改善系统的性能;
(4)如果选择带先导阀的比例阀,要注意先导阀对油液污染度的要求。-般应符合ISO 18/5标准,并在油路上加装过滤精度为10um以下的进油过滤器;
(5)比例阀的通径应按执行器在高速度时通过的流量来确定,通径选得过大,会使系统的分辨率降低:
(6)比例阀必须使用与之配套的放大器,阀与放大器的距离应尽可能地短。
电液比例阀是采用了比例控制技术,介于开关型液压阀和电液伺服阀之间的-种液压元件,在工业生产中获得了广泛的应用,输入的电信号有模拟式和数字式两大类,可以用于控制位置(转角)、速度(转速)、加速度(角加速度)、压力(压差)、力(力矩)等参数。电液比例阀等元件可以组成如下三类控制回路和系统
(1)电液比例压力控制回路和系统。例如:用于带钢热连轧机卷取机液压辅助系统的电液比例压力控制回路,用于板带轧机辊缝控制的液压推上系统电液比例压力控制回路,用于带材卷取设备恒张力的闭环电液比例压力控制回路;
(2)电液比例流量控制回路和系统。例如:用于带钢热连轧机精轧机平衡液压系统的电液比例压力控制回路,用于机床微进给的电液比例控制回路,用于旋压机折板机同步的电液比例控制回路,用于电梯的电液比例控制回路;
(3)电液比例多参数控制回路和系统。例如:用于带钢热连轧机精轧换辊液压系统的电液比例压力控制回路,用于液压缸垂直配置而采用wI型阀芯的比例控制回路,用于热轧钢卷步进链式运输机的速度、加减速度控制回路。
韦米机电供应四位四通伺服电磁阀4WRPEH6C3B25P-30/M/24A1
力士乐REXROTH伺服电磁阀四位四通高频单向阀门,直接驱动,带有集成电子和电气位置反馈(OBE)4WRPEH 6 -3X
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电液比例阀种类和形式
电液比例阀包括比例流量阀、比例压力阀、比例换向阀。工程机械液压操作特点,以结构形式划分电液比例阀主要有两类:一类是螺旋插装式比例阀,另一类是滑阀式比例阀。
滑阀式比例阀又称分配阀,是移动式机械液压系统基本元件之一,是能实现方向与流量调节复合阀。电液滑阀式比例多路阀是比较理想电液转换控制元件,它保留了手动多路阀基本功能,还增加了位置电反馈比例伺服操作和负载传感等先进控制手段。它是工程机械分配阀更新换代产品。
出于制造成本考虑和工程机械控制精度要求不高特点,--般比例多路阀内不配置位移感应传感器,具有电子检测和纠错功能。,阀芯位移量容易受负载变化引起压力波动影响,操作过程中要靠视觉观察来保证作业完成。电控、遥控操作时更应注意外界千涉影响。近来,电子技术发展,人们越来越多采用内装差动变压器(LDVT)等位移传感器构成阀芯位置移动检测,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高度集成比例阀,具有一定校正功能,可以有效克服一.般比例阀缺点,使控制精度到较大提高。
电液比例多路阀负载传感与压力补偿技术
节约能量、降低油温和提高控制精度,同时也使同步动作几个执行元件运动时互不干扰,现较先进工程机械都采用了负载传感与压力补偿技术。负载传感与压力补偿是一一个很相似概念,都是利用负载变化引起压力变化去调节泵或阀压力与流量以适应系统工作需求。负载传感对定量泵系统来讲是将负载压力负载感应油路引至远程调压溢流阀上,当负载较小时,溢流阀调定压力也较小;负载较大,调定压力也较大,但也始终存一定溢流损失。变量泵系统是将负载传感油路引入到泵变量机构,使泵输出压力随负载压力升高而升高(始终为较小固定压差),使泵输出流量与系统实际需要流量相等,无溢流损失,实现了节能。压力补偿是提高阀控制性能而采取一种保证措施。将阀口后负载压力引入压力补偿阀,压力补偿阀对阀口前压力进行调整使阀口前后压差为常值,这样节流口流量调节特性流经阀口流量大小就只与该阀口开度有关,而不受负载压力影响。
工程机械电液比例阀先导控制与遥控
电液比例阀和其它专用器件技术进步使工程车辆挡位、转向、制动和工作装置等各种系统电气控制成为现实。一般需要位移输出机构可采用比例伺服控制手动多路阀驱动器完成。电气操作具有响应快、布线灵活、可实现集成控制和与计算机接口容易等优点,现代工程机械液压阀已越来越多采用电控先导控制电液比例阀(或电液开关阀)代替手动直接操作或液压先导控制多路阀。采用电液比例阀(或电液开关阀)另一个显著优点是工程车辆上可以大大减少操作手柄个数,这使驾驶室布置简洁,能够有效降低操作复杂性,对提高作业质量和效率都具有重要实际意义。
C4-X20X/DC24V RF-5619 R
C5-A30/DC110V RF-5647 R
C5-A30/DC220V RF-5648 R
C5-E20D/DC12V RF-5437 R
C5-M10/DC110V RF-5633 R
C5-M10/DC220V RF-5611 R
C5-M10/DC24V RF-5610 R
C5-M10/DC24V RF-5629 R
C5-M10D/DC24V RF-5658 R
C5-M20/DC24V RF-5640 R
C5-S10D/DC12V RF-5436 R
C5-X10D/DC24V RF-5665 R
C5-X10X/DC24V RF-5628 R
C7-T21XT/AC230V R
C7-T21XT/AC24V R
C7-T21XT/DC24V R
C7-X10/DC24V RF-5654 R
MR 311/AC230V R
MR 312/AC115V R
MR 312/AC230V R
MR 313/AC115V R
MR 313/AC24V R
MR 313/AC400V R
MR 313P/AC115V R
MR 511/DC110V R
MR 511/DC24V R
MR 512/DC110V R
MR 512/DC12V R
MR 512/DC220V R
MR 512/DC24V R
MR 512/DC24V+ L40W RF-5217 R
MR 512/DC60V R
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MR 513/DC220V R
MR 513/DC24V RF-5176 R
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MR 513P/DC12V R
MR 513P/DC12V RF-5429 R
MR 563/DC24V RF-5493 R
MR 611 012D (N) RF-5522 R
R7-A20DT/DC110V RF-5572 R
CHA1/UC24V
B103/AC110-127V R
B103/AC220-240V R
B103/UC24V R
B103/UC48V R
B103/UC8-12V R
C20301/AC110-127V R
C20301/AC220-240V R
C20301/DC12V R
C20301/UC24V R
C20301/UC48V R
CHI14/UC24-240V R
CR16CX/AC230V R
CR16CX/DC24V R
C20304/DC12-15V R
C20304/DC24V R
C20304/DC48V R
C30104/DC12-15V R
C30104/DC24V R
C30104/DC48V R
CR11C/DC24V R
CR33A/DC24V R
CRS1C/AC230V R
CRS1C/DC24V R
KDW3-24/UC24-240V R
RAC20-110/UC230V
RAC20-110/UC24V
RAC20-200/UC230V
RAC20-200/UC24V
RAC25-400/UC230V
RAC25-400/UC24V
RBC-AUX11
RBC-AUX20
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RIC-AUX-02
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RIC-DIST
RIC-SEAL20
RIC-SEAL25
RIC-SEAL40/63
RIC20-020/UC230V
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RIC20-110/UC230V
RIC20-110/UC24V
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RIC20-200/UC110V
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RIC25-040/AC400V
RIC25-040/UC230V
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RIC40-040/UC230V
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RIC40-220/UC24V
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RIC63-220/UC230V
RIC63-220/UC24V
RIC63-400/UC230V
RIC63-400/UC24V
CMS-10ACDF/DC12-48V R
CMS-10ACDFKIT/DC12-48V R
CMS-10ADF/DC12-48V R
CMS-10ADFKIT/DC12-48V R
CMS-10F/AC110-240V R
CMS-10F/DC12-48V R
CMS-10FKIT/AC110-240V R
CMS-10FKIT/DC12-48V R
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CMS-ANT-KAB/5M
CMS-ANT-MAG/25M
CMS-ANT-SPEZ/5M
CMS-GSM-MOD
CMS-RS232
CMS-SMA
CMS-USB
MV LKM 254
MV LKM 274
RTBSB-001-010
AF-10MR-A-CAP/AC110-240V
AF-10MR-A-LCD/AC110-240V
AF-10MR-D-CAP/DC24V
AF-10MR-D-LCD/DC24V
AF-10MT-GD-CAP/DC24V
AF-10MT-GD-LCD/DC24V
AF-20MR-A-CAP/AC110-240V
AF-20MR-A-LCD/AC110-240V
AF-20MR-D-CAP/DC24V
AF-20MR-D-LCD/DC24V
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AF-20MT-GD-LCD/DC24V
AF-ATL
AF-AUD
AF-BC
AF-CAP
AF-D232
AF-LCD
AF-M232
CT2-A30/L UC20-65V R
CT2-A30/M UC90-150V R
CT2-A30/S DC95-18V R
CT2-A30/U UC180-265V R
CT2-B30/H UC90-265V R
CT2-B30/L UC20-65V R
CT2-B30/S DC95-18V R
CT2-E30/H UC90-265V R
CT2-E30/L UC20-65V R
CT2-E30/S DC95-18V R
CT2-K30/L UC20-65V R
CT2-K30/M UC90-150V R
CT2-K30/S DC95-18V R
CT2-K30/U UC180-265V R
CT2-W30/H UC90-265V R
CT2-W30/L UC20-65V R
CT2-W30/S DC95-18V R
CT3-A30/L UC20-65V R
CT3-A30/M UC90-150V R
CT3-A30/S DC95-18V R
CT3-A30/U UC180-265V R
CT3-B30/H UC90-265V R
CT3-B30/L UC20-65V R
CT3-B30/S DC95-18V R
CT3-E30/H UC90-265V R
CT3-E30/L UC20-65V R
CT3-E30/S DC95-18V R
CT3-E30/UP UC132-265V R
CT3-K30/L UC20-65V R
CT3-K30/M UC90-150V R
CT3-K30/S UC95-18V R
CT3-K30/U UC180-265V R
CT3-W30/H UC90-265V R
CT3-W30/L UC20-65V R
CT3-W30/S DC95-18V R
CT30/UC110-240V R
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C85/UC24-240V R
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AM2/AC220-240V R
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CIM33/UC24-240V
CIM33R/UC24-240V
CIM3R/UC24-240V
CM3/DC12-24V R
CM3/DC24-48/AC24-240V R
CMD11-A/AC115V R
CMD11-A/AC230V R
CMD11-A/UC12V R
CMD11-A/UC24V R
CMD11-E/AC115V R
CMD11-E/AC230V R
CMD11-E/UC12V R
CMD11-E/UC24V R
CNR1/UC110-240V R
CNR1/UC24-60V R
CPF11/DC24V R
CRV3/AC230V R
CRV3/UC24V R
CSV4/DC12-36V R
CY1/UC110-240V R
CY1/UC24-60V R
SSU31/AC208V
SSU31/AC400V
SSU33L/AC230V 50HZ
SSU33L/AC400V 50HZ
TSR19/AC230V
TSR19/UC24-48V
ECR-3D-05/UC110-240V
ECR-3D-05/UC24V
EOCR-AR-05/AC115V
EOCR-AR-05/AC230V
EOCR-AR-05/UC24V
EOCR-AR-30/AC115V
EOCR-AR-30/AC230V
EOCR-AR-30/UC24V
EOCR-AR-60/AC115V
EOCR-AR-60/UC24V
ESU-D2/UC110-240V
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ESU-D2R/UC24-48V
EUCR-BR-05/AC230V
EUCR-BR-05/UC24V
EUCR-BR-30/AC115V
EUCR-BR-30/AC230V
EUCR-BR-30/UC24V
EUCR-BR-60/AC115V
EUCR-BR-60/UC24V
MRI11/UC110-240V
MRI11/UC12-48V
MRI11R/UC110-240V
MRI11R/UC12-48V
MRI32/UC110-240V
MRI32/UC12-48V
MRI32R/UC110-240V
MRI32R/UC12-48V
MRM11/UC110-240V
MRM11/UC12-48V
MRM11R/UC110-240V
MRM11R/UC12-48V
MRM32/UC110-240V
MRM32/UC12-48V
MRM32R/UC110-240V
MRM32R/UC12-48V
MRU11/UC110-240V
MRU11/UC12-48V
MRU11R/UC110-240V
MRU11R/UC12-48V
MRU32/UC110-240V
MRU32/UC12-48V
MRU32R/UC110-240V
MRU32R/UC12-48V
MV53/AC115V 50/60HZ
MV53/AC230V 50/60HZ
SSU34/AC100V 50HZ
SSU34/AC400V 50HZ
SSU34/AC500V 50HZ
SSU36/AC208V 60HZ
SSU36/AC460V 60HZ
SSU36/AC480V 60HZ
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