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我国自主开发研制成功具有国际领先水平的新型高压低噪声机电控制式径向柱塞泵在通过了国家权威部门的测试和鉴定后,已广泛应用到冶金、重机及矿山等行业,取得了非凡的业绩和良好的信誉。液压泵是液压设备的动力源,是液压系统的核心设备。按其结构可分为齿轮泵、叶片泵、螺杆泵和柱塞泵等。按其性能可分为中、低压泵和高压泵。齿轮泵、叶片泵和螺杆泵一般属于中低压泵;柱塞泵为高压泵;柱塞泵又分为轴向柱塞泵和径向柱塞泵两种。新型径向柱塞泵是国际上近一、二十年才发展起来的一种新型泵。这种新型高压径向柱塞泵以其结构简单、工艺性… 相似文献
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本文通过对广钢双膛石灰窑液压系统在生产运行过程中的噪音和振动原因进行了分析,认为柱塞泵的噪音是液压系统噪音产生的主要原因,而柱塞泵出口的流量脉动和压力脉动则是造成次级噪音的原因。并提出解决问题的途径之一是采用具有P—Q控制降噪新技术的柱塞泵,认为这种柱塞泵能够更有效地减少柱塞泵泵体产生的噪音量以及柱塞泵出口流量脉动和压力脉动引起的次级噪音量。 相似文献
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针对进口液压柱塞泵的软寿命进行分析,详尽地介绍了影响液压柱塞泵软寿命的因素,提出了液压柱塞泵在线监测与检测的方法及检测维修制度。 相似文献
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通过分析Parker恒压变量柱塞泵的参数和运行环境,将Parker恒压变量柱塞泵的参数和运行环境和国产泵进行一一对比,证明了Parker恒压变量柱塞泵完全可以进行国产化改进。 相似文献
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通过对力士乐A4VSO系列液压轴向柱塞泵的控制方式、调试设定、故障维护和影响轴向柱塞泵寿命的因素和监测的分析,给出了A4VSO系列液压轴向柱塞泵在使用设计、维护、故障处理上的注意事项。 相似文献
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石横特殊钢厂连铸机、电炉液压系统中采用A2F6.1型斜轴式柱塞泵替代原柱塞泵,经合理选型,正确安装,使柱塞泵的使用寿命提高了2~4倍,大大减少了维修次数和热停机时间,年节约资金44.2万元。 相似文献
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Insertion of electrically floating wires along the axis of a squid giant axon produces an apparent increase in diameter in the region where the wire surface has been treated to give it a low resistance. The shape of action potentials propagating into this region depend upon the surface resistance (and the length) of the wire. As this segment's internal resistance is lowered by reducing the wire's surface resistance, the following characteristic sequence of changes in the action potential is seen at the transition region: (a) the duration increases; (b) two peaks develop, the first one generated in the normal axon region and the second one generated later in the axial wire region, and; (c) blockage occurs (for a very low resistance wire). Action potentials recorded at the membrane region near the tip of the axial wire in (b) resemble those recorded at the initial segment of neurons upon antidromic invasions. Squid axon action potentials propagated from a normal region into that containing the low resistance wire also resemble antidromic invasions recorded in neuron somas. Hyperpolarizing current pulses applied through the wire act as if the wire surface resistance was momentarily reduced. For example, the two components of the action potential recorded at the axial wire membrane region noted in (b) can be sequentially blocked by the application of increasing hyperpolarizing current through the wire. Similar effects are seen when hyperpolarizing currents are injected into motoneuron somas. It is concluded that the geometrical properties of the junction of a neuron axon with its soma may be in themselves sufficient to determine the shape of the action potentials usually recorded by microelectrodes. 相似文献
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介绍了酒钢微合金高碳钢硬线轧制工艺研究。与普通高碳钢相比,铌元素的加入使微合金高碳钢的A→P转变温度区间扩大,开始转变温度升高,转变结束温度降低,转变完成所需时间增加。与普通高碳钢相比,含铌高碳钢受冷却速度的影响较大:随着控冷冷速的提高,线材内部索氏体含量增加,珠光体和先共析铁素体的含量降低,线材的强度、塑性向着有利于深加工的方向发展。 相似文献
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S. Sathikh S. Rajasekaran Jayakumar C. Jebaraj 《Canadian Metallurgical Quarterly》2000,126(2):132-139
A general discrete thin rod model to study the preslip response of a strand of helical wires having wires-to-core friction contacts under constant curvature free bending has been developed for the case of Coulomb stick friction that considers together (a) all the three wire forces and three wire couples; (b) more appropriate equations for the wire shear forces; (c) the wire normal force as one of the contributors to strand bending moment; (d) wire external equilibrium; and (e) wire rolling with or without zero net shear on the strand cross section. The individual contributions of wire forces and couples to the strand bending moment for 10 models including EPRI model are compared. Several earlier models are shown to be special cases of the present general model. 相似文献
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宝钢高速线材硬线钢夹杂物处理技术探讨 总被引:4,自引:0,他引:4
概述了高碳硬线钢夹杂物处理的几种工艺情况,通过从钢坯取样,对夹杂物尺寸,组成和形态及钢坯中夹杂物总量进行分析测定,并对几种工艺处理夹杂物效果进行评价,其结果表明:常规真空处理及喷吹高碱度粉剂可满足一般要求高碳钢丝的生产要求,采用RH和Ca处理工艺,可提高高碳钢丝的疲劳寿命,对高碳钢丝中夹杂物进行无害化处理,可满足高品质的钢丝生产要求。 相似文献
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钢丝绳是起重机械的重要部件,维护钢丝绳的安全是保证起重机械正常运行的基础,合理地对钢丝绳进行选型及更换,有利于生产的正常进行,减少安全事故的发生. 相似文献
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提升系统是矿山正常生产的前提,是矿山经济效益的保证,因此选择合适的提升系统是关键。首先根据斜井提升绞车的改造要求,再结合各种结构钢丝绳的优缺点,对钢丝绳和提升绞车各参数进行计算,通过计算结果选择适合的钢丝绳和提升绞车型号并校核。 相似文献
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