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20V2A 叶片泵
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20V2A-1B22R
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20V2A-1D22R
20V3A
20V3A-1A22R
20V3A-1B22R
20V3A-1C22R
20V3A-1D22R
20V4A
20V4A-1A22R
20V4A-1B22R
20V4A-1C22R
20V4A-1D22R
20V5A
20V5A-1A22R
20V5A-1B22R
20V5A-1C22R
20V5A-1D22R
20V6A
20V6A-1A22R
20V6A-1B22R
20V6A-1C22R
20V6A-1D22R
20V7A
20V7A-1A22R
20V7A-1B22R
20V7A-1C22R
20V7A-1D22R
20V8A
20V8A-1A22R
20V8A-1B22R
20V8A-1C22R
20V8A-1D22R
20V9A
20V9A-1A22R
20V9A-1B22R
20V9A-1C22R
20V9A-1D22R
20V10A
20V10A-1A22R
20V10A-1B22R
20V10A-1C22R
20V10A-1D22R
20V11A
20V11A-1A22R
20V11A-1B22R
20V11A-1C22R
20V11A-1D22R
20V12A
20V12A-1A22R
20V12A-1B22R
20V12A-1C22R
20V12A-1D22R
20V14A
20V14A-1A22R
20V14A-1B22R
20V14A-1C22R
20V14A-1D22R
25V10A
25V10A-1A22R
25V10A-1B22R
25V10A-1C22R
25V10A-1D22R
25V12A
25V12A-1A22R
25V12A-1B22R
25V12A-1C22R
25V12A-1D22R
25V14A
25V14A-1A22R
25V14A-1B22R
25V14A-1C22R
25V14A-1D22R
25V15A
25V15A-1A22R
25V15A-1B22R
25V15A-1C22R
25V15A-1D22R
25V17A
25V17A-1A22R
25V17A-1B22R
25V17A-1C22R
25V17A-1D22R
25V19A
25V19A-1A22R
25V19A-1B22R
25V19A-1C22R
25V19A-1D22R
25V21A
25V21A-1A22R
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25V21A-1D22R
35V21A
35V21A-1A22R
35V21A-1B22R
35V21A-1C22R
35V21A-1D22R
35V25A
35V25A-1A22R
35V25A-1B22R
35V25A-1C22R
35V25A-1D22R
35V30A
35V30A-1A22R
35V30A-1B22R
35V30A-1C22R
35V30A-1D22R
35V32A
35V32A-1A22R
35V32A-1B22R
35V32A-1C22R
35V32A-1D22R
35V35A
35V35A-1A22R
35V35A-1B22R
35V35A-1C22R
35V35A-1D22R
35V38A
35V38A-1A22R
35V38A-1B22R
35V38A-1C22R
35V38A-1D22R
45V42A
45V42A-1A22R
45V42A-1B22R
45V42A-1C22R
45V42A-1D22R
45V45A
45V45A-1A22R
45V45A-1B22R
45V45A-1C22R
45V45A-1D22R
45V50A
45V50A-1A22R
45V50A-1B22R
45V50A-1C22R
45V50A-1D22R
45V57A
45V57A-1A22R
45V57A-1B22R
45V57A-1C22R
45V57A-1D22R
45V60A
45V60A-1A22R
45V60A-1B22R
45V60A-1C22R
45V60A-1D22R
45V66A
45V66A-1A22R
45V66A-1B22R
45V66A-1C22R
45V66A-1D22R
45V76A
45V76A-1A22R
45V76A-1B22R
45V76A-1C22R
45V76A-1D22R
2520V双联
3525V双联
20V2A-86A22R
20V2A-86B22R
20V2A-86C22R
20V2A-86D22R
4535V双联
20V3A-86A22R
20V3A-86B22R
20V3A-86C22R
20V3A-86D22R
20V4A-86A22R
20V4A-86B22R
20V4A-86C22R
20V4A-86D22R
20V5A-86A22R
20V5A-86B22R
20V5A-86C22R
20V5A-86D22R
20V6A-86A22R
20V6A-86B22R
20V6A-86C22R
20V6A-86D22R
20V7A-86A22R
20V7A-86B22R
20V7A-86C22R
20V7A-86D22R
20V8A-86A22R
20V8A-86B22R
20V8A-86C22R
20V8A-86D22R
20V9A-86A22R
20V9A-86B22R
20V9A-86C22R
20V9A-86D22R
20V10A-86A22R
20V10A-86B22R
20V10A-86C22R
20V10A-86D22R
20V11A-86A22R
20V11A-86B22R
20V11A-86C22R
20V11A-86D22R
20V12A-86A22R
20V12A-86B22R
20V12A-86C22R
20V12A-86D22R
20V14A-86A22R
20V14A-86B22R
20V14A-86C22R
20V14A-86D22R
25V10A-86A22R
25V10A-86B22R
25V10A-86C22R
25V10A-86D22R
25V12A-86A22R
25V12A-86B22R
25V12A-86C22R
25V12A-86D22R
25V14A-86A22R
25V14A-86B22R
25V14A-86C22R
25V14A-86D22R
25V15A-86A22R
25V15A-86B22R
25V15A-86C22R
25V15A-86D22R
25V17A-86A22R
25V17A-86B22R
25V17A-86C22R
25V17A-86D22R
25V19A-86A22R
25V19A-86B22R
25V19A-86C22R
25V19A-86D22R
25V21A-86A22R
25V21A-86B22R
25V21A-86C22R
25V21A-86D22R
35V21A-86A22R
35V21A-86B22R
35V21A-86C22R
35V21A-86D22R
35V25A-86A22R
35V25A-86B22R
35V25A-86C22R
35V25A-86D22R
35V30A-86A22R
35V30A-86B22R
35V30A-86C22R
35V30A-86D22R
35V32A-86A22R
35V32A-86B22R
35V32A-86C22R
35V32A-86D22R
35V35A-86A22R
35V35A-86B22R
35V35A-86C22R
35V35A-86D22R
35V38A-86A22R
35V38A-86B22R
35V38A-86C22R
35V38A-86D22R
45V42A-86A22R
45V42A-86B22R
45V42A-86C22R
45V42A-86D22R
45V45A-86A22R
45V45A-86B22R
45V45A-86C22R
45V45A-86D22R
45V50A-86A22R
45V50A-86B22R
45V50A-86C22R
45V50A-86D22R
45V57A-86A22R
45V57A-86B22R
45V57A-86C22R
45V57A-86D22R
45V60A-86A22R
45V60A-86B22R
45V60A-86C22R
45V60A-86D22R
45V66A-86A22R
45V66A-86B22R
45V66A-86C22R
45V66A-86D22R
45V76A-86A22R
45V76A-86B22R
45V76A-86C22R
45V76A-86D22R
(2)电力电子和变频电机为动力元件,以提高动力流的能效为导向。大家看到现在好多泵站,采用了变频或者伺服电机驱动+定量泵技术,来取代传统的变量泵。从这方面看,液压最大的竞争是交流伺服系统,尤其在固定设备里,好多液压系统被踢出来了。但在移动设备比如工程机械里,液压的地位还是比较巩固的。
现代电气传动系统以其优良、方便的调速性能,很强的负载动、静态模拟能力,便于实现能量回收,在液压测试技术中的应用主要包括:
液压驱动的电气化。液压泵试验台的交流变频驱动,泵驱动的调速更加灵活、方便。
液压测试中的关键技术
液压测试技术的趋势是自动化、网络化、多电化,随之,出现很多傻瓜型试验台,使用简单、功能强大,给我们的感觉好像是每个人都可以做好液压测试了,大家说自动化以后对人的要求降低了,这其实是误导,甚至会造成危险,因为它让我们认为不需要思考了。实际上,简单只是对操作人员,而对液压测试人员的专业化要求是越来越高。做测试,如果对整个元件、系统,包括试验装置不了解的话,要把元件测试做好几乎是不可能的。如果我们假设被测对象的模型不正确,如果我们用不正确的测量方式,如果我们不考虑测量方法的不确定性,那么我们就可能得到完全错误的结果,更可怕的是我们并不知道。传感器、仪器仪表等测量设备的性能越来越高,过去0.1%的精度就被认为是高精度,今天便宜、简单数字测量设备就能提供0.05%的测量精度。但是要发挥好这些测量设备的效能,需要液压测试技术人员测试系统(从传感器、信号调理器,到仪器仪表、计算机采集系统)对进行正确的精度分析,这对测量至关重要。所以自动化只是对操作人员的要求降低了,但对测试专家来说,它的要求不是降低了而是提高了。这是自动化带来的问题,我们需要特别重视。
1、关键技术之一:加载技术(机械、液压、测功机)
(1)机械加载。可用于-或可通过-进行的测试。摩擦片加载、扭板弹簧加载、惯性盘加载等方法。这些方法一般都简单易行,但由于各种-均不适合于大功率、无级加载的情况,在工程机械中很少应用。
(2)液压加载。可用溢流、节流、二次调节元件进行加载。
溢流阀:受限于最小调节压力,加载压力不能从零开始,低压、大流量特性测试时效果差。
节流阀:虽然可从零开始加压,但加载压力与流量成平方关系,大流量时节流口微小变化都会引起加载压力很大变化,加载压力调节困难;流量变化时,加载压力需要反复调节。
二次调节元件:可恒扭矩和恒转速加载,四象限工作,具备功率回收能力,但控制复杂,技术难度大。
(3)测功机加载。该加载方式主要是配合-一起使用,将液压能通过-转换为机械能,测功机吸收机械能,从而实现加载,是现在广泛采用的一种技术,目前常用的测功机主要分为磁滞测功机、磁粉测功机、电涡流测功机、水力测功机、电力测功机。除电力测功机外,磁滞测功机、磁粉测功机、电涡流测功机、水力测功机等都是要耗能的,一般都是讲其吸收的机械能转成热能给消耗掉了。电力测功机目前在液压测试领域应用的还不是很多,所谓电力测功机简单的讲就是电力逆变装置+变频电机或交流伺服电机,这里变频电机既可以做发电机,将机械能转换为电能返回电网,也可以从电网取电将电能转换为机械能,类似液压中的二次元件,可以在四象限工作,可以能量回收,而且扭矩控制精度可以到千分之二。未来,这种加载方式应该会成为液压试验与测试装置加载的主流。