力士乐插入式电磁逆止阀R930063870 OD150217A000000，德国REXROTH螺纹插装阀电磁阀，力士乐机械插装阀电磁阀，上海韦米机电设备有限公司主营销售产品，原厂原装，质量保障，销售热线：13524123009，在线QQ：2896079243，传真：021-51334670；联系人：雷青。热诚欢迎新老客户咨询购买！

无反馈比例电子控制
轮式工程机械有一类机械边行走边工作，常常需行走转移,例如:装载机、叉车和平地机等。这类机械其行走系统的驱动和操纵，希望像汽车自动变速器一样，能自动变速和变矩，并能防止发动机熄火，要求对液压传动进行自动控制功。车辆型液压行走系统的控制要求如以下几点:
1.只需通过油门操纵就能控制车速，操纵简单方便;
2.液压行走系统能自动变速(和轿车自动变速器类似)，与发动机匹配具有良好的动力性和经济性;
3.有过载保护，能防止发动机熄火,特别是行走和工作装置同时工作，超.负荷时发动机不熄火;
4.实现无载启动，即发动机启动时，液压泵处于零排量;
5.能直接对液压行走系统泵(和马达)的排量进行超越控制，实现微动和爬行;
6.与行走制动实现联动控制，即制动时，先液压制动，再制动器起作用。

车辆静压传动数字电子式自动控制，采用开式无反馈电液比例控制，主要用于叉车、装载机之类需要同时进行装卸作业和行走运输的机械。其具体功能包括:
(1)油泵和油马达电子控制自动变排量通过转速传感器检出发动机转速，转换后输入控制器，经处理输出控制信号，通过电磁比例减压阀来控制变量油泵的排量，同时控制两位马达或线性马达排量，这类机械的操纵如汽车一样，司机只需通过油门踏板来操纵，液压系统油泵和油马达不需操纵，随着发动机转速和系统油压自动改变排量。
1)油泵自动控制
考虑工作装置和附属装置的动力需要，按充分利用发动机转矩(特性)来设定油泵自动控制特性。
2)马达自动控制
两位马达控制:马达排量自动转换点与发动机转速、系统压力有关;马达变排量比例控制:按马达自动控制曲线进行，此控制曲线是发动机转速的函数，排量变化也与系统压力有关。
3)模式控制
根据机械使用工况(作业/运输)分别设置两种模式，通过模式开关，选用两种不同的独立的泵和马达自动控制曲线。
(2)行走方向和停车控制
应用FNR开关可以选择行驶方向(前进或后退),实现停车控制(中位),其加减速延迟时间可以调整。
(3)人工操纵微动控制和爬行控制(微动模式和爬行模式)
1)微动模式:采用脚踏板电操纵(电位器) ,降低电磁比例减压阀的电流,使油泵排量减小。此功能可以实现发动机高转速、泵大排量时，行走保持低车速。微动传感器在车辆设定时必须标定(或传感仪器预先调正)。
2)爬行模式:具体原理同微动模式。爬行模式需要通过一个数字输入(开关)来启动，爬行模式启动后，爬行速度可以通过一个电位器旋钮调整。要设定一个可调的加速/减速延迟时间，防止改变车速时产生冲击。
(4)发动机超速保护
下坡时，液压系统处于制动工况，泵在系统中成为马达，如果此时踩下微动踏板，控制电流降低，油泵排量减小，会引起泵转速的增加，就可能引起发动机超速。NFPE控制系统的控制器检测到发动机超速，其输出电流就会增至大，油泵排量增至大，以防止发动机超速。要预先设置发动机过载保护起始点(控制电流增加点)和终止点(泵排量大点)。
(5)制动连动控制
1)手制动(开关)信号输入，FNR信号失效，即手制动起作用，相当于FNR处于中位时的停车模式。
2)集成停车制动控制，停车制动防止油泵在中位时机械滚动。停车制动器采用两位四通电磁阀操纵，通过输入电磁比例减压阀的电流或微动阀踏板行程
进行控制。当电磁阀断电或微动阀踏板达到一定行程时，制动器抱死。车辆一旦启动，发动机达到某一设定转速， 电磁阀通电，制动器自动松开。
3)液压制动和机械制动连动控制，独立于微机控制采用直接电操纵，当踩制动踏板，制动油压达到一定值时，压力开关起作用，通过电操纵旁通电磁阀,
使变量泵伺服油缸的油路连通，斜盘回中位，同时制动油路与制动器相通，制动器制动，制动力与制动踏板行程(制动油路压力)成正比。液压制动先于机械制动起作用。(旁通电磁阀一般由用户外接)

力士乐插入式电磁逆止阀R930063870 OD150217A000000

德国力士乐REXROTH插入式电磁逆止阀订货号和型号：

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起重机械，是指用于垂直升降或者垂直升降并水平移动重物的机电设备，其范围规定为额定起重量大于或者等于0.5t的升降机；额定起重量大于或者等于1t，且提升高度大于或者等于2m的起重机和承重形式固定的电动葫芦等。 
起重机械分为：桥式起重机、门式起重机、塔式起重机、流动式起重机、门座式起重机、升降机、缆索式起重机、桅杆式起重机、机械式停车设备。

起重机械通过起重吊钩或其它取物装置起升或起升加移动重物。起重机械的工作过程一般包括起升、运行、下降及返回原位等步骤。起升机构通过取物装置从取物地点把重物提起，经运行、回转或变幅机构把重物移位，在指定地点下放重物后返回到原位。

起重机操作系统
通过电气、液压系统控制操纵起重机各机构及整机的运动，进行各种起重作业。控制操纵系统包括各种操纵器、显示器及相关元件和线路，是人机对话的接口。安全人机学的要求在这里得到集中体现。该系统的状态直接关系到起重作业的质量、效率和安全。

桥式起重机是横架于车间、仓库和料场上空进行物料吊运的起重设备。由于它的两端坐落在高大的水泥柱或者金属支架上，形状似桥。桥式起重机的桥架沿铺设在两侧高架上的轨道纵向运行，可以充分利用桥架下面的空间吊运物料，不受地面设备的阻碍。它是使用范围广、数量多的一种起重机械。

桥式起重机是现代工业生产和起重运输中实现生产过程机械化、自动化的重要工具和设备。 所以桥式起重机在室内外工矿企业、钢铁化工、铁路交通、港口码头以及物流周转等部门和场所均得到广泛的运用。

门式起重机是桥式起重机的一种变形，又叫龙门吊。主要用于室外的货场、料场货、散货的装卸作业。门式起重机具有场地利用率高、作业范围大、适应面广、通用性强等特点，在港口货场得到广泛使用。
它的金属结构像门形框架，承载主梁下安装两条支脚，可以直接在地面的轨道上行走，主梁两端可以具有外伸悬臂梁。


压实机械，利用机械力使土壤、碎石等填层密实的土方机械。广泛用于地基、道路、飞机场、堤坝等工程。
压实机械按工作原理分为：静力碾压式，有取代静力碾压式压实机的趋势。冲击式，振动式和复合作用式等。力碾压式压实机械利用碾轮的重力作用，振动作用的振动式压路机，使被压层产生永久变形而密实。碾压和冲击作用的冲击式压路碾等。其碾轮分为：光碾、槽碾、羊足碾和轮胎碾等。槽碾、羊足碾单位压力较大，压实层厚，适用于路基、堤坝的压实。轮胎式压路机轮胎气压可调节，可增减压重，单位压力可变，压实过程有揉搓作用，使压实层均匀密实，适用于道路、广场等垫层的压实。且不伤路面，适用于道路、广场等垫层的压实。


桩工机械是指在各种桩基础施工中，用来钻孔、打桩、沉桩的机械。
桩工机械一般由桩锤与桩架两部分组成。除专用桩架外，也可以在挖掘机或者起重机上设置桩架，完成打桩任务。桩工机械的主要特点是，专用性强，生产批量小。

混凝土机械，利用机器取代人工把水泥、河沙、碎石、水按照一定的配合比进行搅拌，生产出建筑工程等生产作业活动所需的混凝土的机械设备，常用的设备有混凝土泵车，水泥仓，配料站等
混凝土机械分类：混凝土泵、混凝土泵车、混凝土搅拌机、混凝土搅拌楼输送泵浇注机、混凝土布料杆、混凝土振动器、混凝土搅拌输送车、混凝土粉碎器、混凝土振动台、混凝土搅拌站、混凝土制品机械液压砂浆泵车载泵、混凝土输送泵深层搅拌机、混凝土喷射机水泥仓、混凝土配料机、混凝土清洗回收设备、混凝土路面摊铺整平机、混凝土罐车配料站。

德国力士乐REXROTH螺纹插装阀电磁阀订货号和型号：

R934000895 OD1505193AS000 VEI8A2A06.19K05.3ANCC218&
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R934001205 OD1505176205OC VEI7A2A09S17K05.62NCL622&
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