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电磁换向阀和电液换向阀
1.结构和工作原理
WE型电磁换向阀采用湿式交流或直流电磁铁。该阀是通过电磁铁控制阀芯的不同工作位置。当电磁铁断电时，阀芯靠弹簧压力保持在中间或终端位置(脉冲式阀除外)。电磁铁通电，阀芯被推到工作位置上，断电后又恢复到初始状态。这时用手推动故障检查按钮可使阀芯移动。
由于湿式电磁铁内部与回油腔相通，这样衔铁油里移动，可以减少磨损、缓冲，并且提高了散热性能，提高了使用寿命。交流电磁铁具有动作时间短，电气控制线路简单，不需特殊的触头保护等特点。直流电磁铁是切换特性软，动作频率高，对过载或低电压反应不敏感，工作可靠。
WE型换向阀是由电磁铁控制的滑阀式换向阀，它主要用于控制液体的通断和流动方向。
其结构主要是由阀体、电磁铁、滑阀以及复位弹簧等组成。在不通电的情况下被复位弹簧保持在中间位置或初始位置上(脉冲阀除外)。电磁铁的推力通过推杆作用在滑阀上，并且把它从静止位置推到工作位置上(终端位置)，由此改变了液流的方向P→A和B→T或者P→B和A→T。当电磁铁断电后，滑阀被复位弹簧重新推到原来的静止位置上。在电磁铁断电时，用故障检查按钮推动滑阀移动。
详解举例：4WE6D6X/EG24N9K4
4→4通（也有3通）4个方向油口
6→通经为6
D→机能符号（也有C、D、E、EA、EB等）
6X→60至69系列 安装和油口尺寸不变
斜杠（/）后面：无符号→弹簧复位
O→无弹簧复位
OF→无弹簧复位带.作用
E→高功率电磁铁带可拆卸线圈的湿式电磁铁
G→直流电压（W代表交流如W230代表交流230V电压 50/60Hz,G205代表直流电压205V等其它电压和频率）
24→24V电压
N9→代表有隐式手动应急操作（标准）（只有N代表带有手动应急操作，无手动应急操作无代号）
K4→电气接线形式（单独接线，带有插头.销DIN43 650-AM2,无导线插座）（DL指代集中接线在盖上有引线，有亮灯显示；DKL在盖上有集中插头，有亮灯显示（不带直角插座）
K4后面：无标识→无插入式节流口
B08→节流口fl 0.8mm
B10→节流口fl 1.0mm
B12→节流口fl 1.2mm
B08后面：无标识→丁晴橡胶密封
V→佛橡胶密封 （注意所用液压油与密封件的适应性）
V后面：无标识→不带.销孔
/60→带.销孔
注塑机是将熔融塑料注射进模具，冷却后即为产品．用途非常广泛，根据塑料不同，使用的地方也不同．注塑机是塑料加工业中使用量大的加工机械，不仅有大量的产品可用注塑机直接生产，而且它还是组成注拉吹工艺的关键设备。
吹塑是制造中空热塑性制品的常用方法，主要产品是筒膜和中空容器。吹塑机可以通过加温使预成型制品塑化，然后进入模具吹制成型，这种方法主要用于高速高产量的PET瓶和BOPP瓶生产，即二步法工艺；吹塑也可以与注塑工艺相结合成为注拉吹一体机，这也是生产PET中容器的常用方法；吹塑工艺还可与挤出工艺相结合，挤出吹塑设备的适应范围更广泛，能够生产的产品也更为丰富，产品包括多层复合薄膜和各类聚烯烃中空容器，广泛用于食品和化妆品行业
吹膜机是将塑料粒子加热融化再吹成薄膜。吹膜机分很多种，有PE，POF等等。吹膜机生产的是膜适用于各种薄膜包装。这种膜由于其阻隔性好，保鲜，防湿，防霜冻，隔氧，耐油，可广泛用于轻重包装。如各种鲜果、肉食品、酱菜、鲜牛奶、液体饮料用品等。
塑料机械中压延机通常和物料输送、筛析、计量、捏合和塑炼等先导装置，引离、牵引、压花、冷却、测厚、卷取、截断等后续装置，以及传动、监控和加热装置等组成完整的压延生产线，生产软硬薄膜、片材、人造革、墙纸和铺地卷材等产品。
挤出机是属于塑料机械的种类之一
挤出机依据机头料流方向以及螺杆中心线的夹角，可以将机头分成直角机头和斜角机头等。
螺杆挤出机是依靠螺杆旋转产生的压力及剪切力，能使得物料可以充分进行塑化以及均匀混合，通过口模成型。塑料挤出机可以基本分类为双螺杆挤出机，单螺杆挤出机以及不多见的多螺杆挤出机以及无螺杆挤出机。
失电关闭电磁阀4WE6D62/EG24N9K4
德国力士乐REXROTH电磁阀订货号和型号：
R900930035 4WE6D6X/EG24N9K4
R900930035 4WE6D62/EG24N9K4
R900561274 4WE6D6X/EG24N9K4
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R900951268 4WE6D6X/EG24N9K4=LB
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R900617005 4WE6D6X/EG24N9K4SO407=AN
R978022817 4WE6D6X/EG24N9K4SO43A-1042
R978027152 4WE6D6X/EG24N9K4SO43A-1755
R901123778 4WE6D6X/EG24N9K4/60
R901146821 4WE6D6X/EG24N9K4/60SO407
R978017922 4WE6D6X/EG24N9K4/62
R901218760 4WE6D6X/EG24N9K4/62SO407
R978890668 4WE6D6X/EG24N9K4/62SO43A-1042
R978900996 4WE6D6X/EG24N9K4/62SO43A-1511
R978915238 4WE6D6X/EG24N9K4/62SO43A-1671
R978013496 4WE6D6X/EG24N9K4/62SO43A-1755
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R901262824 4WE6D6X/EG24N9K4/B10/62
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R901329538 4WE6D6X/EG24N9K4/B30/62=CSA
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R901289230 4WE6D6X/EG24N9K4/V=CSA
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R901068622 4WE6D6X/EG24N9K4/ZVSO407
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R901434740 4WE6D6X/EG24N9K4/ZV=AN
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液压系统及液压元件介绍
一、液压系统的组成：动力部分、控制部分、执行部分、辅助装置 液压泵；用以将机械能转化为液体的压力能，有时也将蓄能器作为紧急或辅助动力源
各类压力、流量、方向等控制阀；用以实现对执行元件的运动速度、方向、作用力等的控制、也用于实现过载保护、程序控制等
液压缸、液压马达等；用以将液体压力转化为机械能
管路、蓄能器、过滤器、油箱、冷却器、加热器、压力表、流量计等
二、液压传动的优点 质量轻体积小 容易实现无级调速 易于实现过载保护 液压元件能够自动润滑 简化机构 便于实现自动化
三、液压传动的缺点 液压元件制造精度要求高 实现定比传动困难 油液受温度的影响 不适宜远距离输送动力 油液中混入空气易影响工作性能 油液容易污染 发生故障不易检查和排除。 四、液压部件及图形符号
上海韦米机电设备有限公司主营产品：
液压元件：柱塞泵、叶片泵、齿轮泵、马达、截止阀、方向阀、减压阀、溢流阀、手动阀、流量控制阀、比例阀、伺服阀、插装阀、电液换向阀、电磁阀、换向阀、电磁球阀、蓄能器、放大版、压力继电器、压力传感器。
气动元件：气动阀、阀岛、阀组、电磁阀、手动阀、换向阀、压力调节阀、流量控制阀，止回阀、气缸和驱动装置、压缩空气气源处理单元、真空技术、传感器、气动连接技术，电气连接技术。
电控伺服：伺服驱动器，伺服电机、PLC模块、I/O模块、框架模块、电源模块、数据接口模块、键相位模块、继电器模块、测速模块、温度模块、显示屏、传感器、探头、前置器、延伸电缆。