REXROTH电磁插装阀OD150118A000000 R930058697,德国力士乐螺纹插装阀,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,现货库存,价格优惠;热诚欢迎新老客户咨询购买!
螺纹插装阀的发展趋势在很大程度上就代表了液压阀的发展趋势但又有它自身的特点。
1.压力的不断提升液压技术的优点之一就是能容比大,其中就是压力高。目前泵的工作压力已达到42MPa,尖峰压力为48MPa,这就要求阀的压力也必须在42-48MPa以上。而螺纹插装阀与二通插装阀都是能承受这压力的阀种。而且承受更高的压力也是有可能的。目前从材料与应用的角度看,35-42MPa是正走向经济合理。
2.阀的通径和流量
阀的通径增加意味阀的流量的不断加大。螺纹插装阀的大通径是M48×2,节流阀流量可达1600l/min;逻辑阀流量达800l/min;单向阀流量640l/min;平衡阀、流量阀等200-480l/min。这一通径是目前所有的螺纹插装阀中的大通径。另一方向是阀可向更小方向减少,用于小流量范围,如小于5l/min以下,这在其他阀种已经比较困难。
3.综合功能的专用阀品种的增加
螺纹插装阀优于其他阀种的大特点之一就是便于开发而且周期短。这方面的发展是随液压应用的要求而发展的。如果主机行业的设计人员不仅熟知主机的工艺要求,还要对液压螺纹插装阀了解更多。
4.提高控制阀的控制精度
目前螺纹插装阀的比例控制、平衡阀、分流阀等的控制精度还不及板式阀。从大多数螺纹插装阀厂商生产的螺纹插装比例阀来看,滞环在3-10%,频响(-3db)在10-25Hz以下,线性度较差与板式阀相比还差一个数量级。这是因为目前螺纹插装阀的主要市场还是工程机械,其负载要求的控制精度不高,可以满足基本要求。但螺纹插装阀要进入工业液压的领域,这一控制精度是不能满足要求的,因此尚有很大的发展空间。
5.提出更多的材质研究要求,进入水液压领域
螺纹插装阀的材质可选性与产品性能、寿命的联系密切,而不像板式阀已经定型。需要深入研究。发展不锈钢、有色金属、表面处理等材质或工艺,使螺纹插装阀进入水液压等领域。由于螺纹插装阀摆脱了阀体的束缚,在材质上的应用余地更大,是今后用于水液压等场合的很好可选阀种。
6.总线技术等新技术进入电磁控制阀
总线技术的时代已经到来,目前已经发展了可用于液压所有元件的总线通讯控制系统,使液压控制系统从电控的方面又加强了先进性与可靠性。这在工程技术又特别的重要,因为这是工程机械发展的方向之一。
7.数字控制技术的发展
目前的数字阀大多数是采用了螺纹插装的结构,因为数字阀主要是作为先导阀使用,通径较小,比较适合用螺纹插装结构。也是今后寻求更易于计算机技术结合并可靠廉价的新的控制方式的方向之一。
8.螺纹插装阀对生产管理技术的挑战
螺纹插装阀的零件小规格多,品种成千,单个的总体价值又有限,因此与板式阀等的生产管理方式有不同。
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德国力士乐REXROTH螺纹插装阀订货号物料号和型号:
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各种行走传动系统比较
工程机械行走系统初主要采用机械传动和液力传动(全液压挖掘机除外)。现在,液压和电传动也出现在工程机械行走驱动装置中,对这一-领域起到了巨大的推动作用。
机械传动
结构简单、工作可靠、成本低、稳态传动效率高并可利用柴油机运动零件的惯性进行作业。但一般只能进行有级变速,并且布局方式受到限制,司机劳
动强度高。因此,机械传动适用于行驶阻力比较稳定的连续作业机械。
2.液力传动
具有分段无级调速能力;输出轴和输入轴之间没有刚性的机械联系,减小了传动系及发动机零件的冲击、振动;变矩器的功率密度大而负荷应力较低;成本不高。这些特点使它广泛应用于大中型铲士、起重、运输等工程机械中。但与液压传动相比,液力传动存在很多缺点:
(1)加速性能较差,不能利用发动机制动;
(2)液力传动缺乏固定速比,不能准确调速;
(3)起动力矩小,低速传动效率低;
(4)液压传动的区比液力传动区范围广;
(5)变矩器不能反转,倒档需采用机械传动,会引起换挡时的动力中断;
(6)布局受限。
电传动
动力装置和车轮之间无刚性联系,便于总体布置及维修;电动轮通用性强,可简单地实现任意多驱动轮驱动的方式来满足不同机械对牵引性能和通过性能的要求;容易实现自动操纵;以电子调节系统调节电动机轴上的转速和转向,调速范围宽广。但它的功率密度低、成本高(据统计电传动系统的成本要比液力机械传动的成本高20%左右)。目前仅用于大功率的自卸式载重汽车及轮式装载机上。
液压传动
与机械传动相比,液压传动更容易实现运动参数(流量)和动力参数(压力)的控制,而液压传动较之液力传动具有良好的低速负荷特性。由于具有传递效率高,输出转速无级调速,可正、反向运转,速度刚性大,动作实现容易等突出优点,液压传动在工程机械中应用广泛。特别是发动机转速控制的恒转矩、恒功率组合调节的变量系统的开发,为液压传动应用于工程机械行走系统提供了广阔的发展前景。
液压行走机械发展展望
1.向中型、大型工程机械发展。近年来,随着生产制造工艺和技术的发展,液压元件质量不断提高,液压行走系统已开始应用于中型(功率为100KW左右)推土机、装载机及大型运输车辆。
2.向高速车辆发展。高速条件下,管路的压力损失限制了其在高速车辆的发展。一种采用液压传动系统的小型车辆中 ,将泵和马达做成一体,使泵直接驱动马达,除去了管路压力损失。此小型车耐久性好和可靠性高,为液压传动应用于高速车辆开辟了道路。
3.发展液压储能行走系统。在减速和制动工况进行能量回收用于其它工况,以节省燃油、减少排放,同时又提高车辆的性能。如果在公共汽车这种经常制动、启动的行走系统采用液压驱动,其理论和实际应用价值都是巨大的。
4.发展液压与机械、液力、电力等的复合传动方式,利用各传动方式的优势适应行走机械多功能和个性化的发展趋势。借助电子技术与液压技术的结合, 可以很方便地实现对液压系统的各种调节和控制。而计算机控制的引入和各类传感元件的应用,更扩展了液压元件的工作范围,使车辆在整个工作范围内实现自动化控制,机器的燃料经济性、动力性、作业生产率均达到值。
采用液压驱动可使工程机械易于实现智能化、节能化和环保化,而这已成为当前和未来工程机械的发展趋势。