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随着当今科技飞速发展,液压技术获了长足进步,近年来在轮机工程领域应用越来越广泛。本文通过简要介绍液压技术在轮机工程上应用情况,其中包括回顾应用历程、总结现状、展望未来发展方向和难点等,为液压设备改造和设计提供了参考依据,同时也指明了液压技术设计优化方向。 相似文献
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武汉某发电厂煤炭堆场的2台斗轮机已使用10多年,其夹轨器(见图1)经常出现故障,十天半月就需要对液压系统进行维修,液压元件经常需要更换. 相似文献
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根据实船使用经验,本文介绍了国产63kNm液压舵机的主要特点及正确使用应注意的有关问题,以期对使用管理此类舵机的轮机人员有所帮助。 相似文献
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本文以某轮舱口盖液压系统压力不稳定故障的分析、排除为例,列举了船舶液压系统压力不稳定的现象及其处理方法,仅供轮机管理人员参考. 相似文献
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本文总结了船舶液压设备产生故障的内在原因和外在原因,并结合船舶实际提出了故障的诊断和步骤,可供轮机管理人员参考。 相似文献
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近年在轮机方面逐渐采用液压拉伸紧配螺栓代替传统的冷冻式紧配螺栓。本文针对液压拉伸紧配螺栓的设计理念、使用、优点等方面作了分析和介绍。 相似文献
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本文介绍了船舶舵机液压锁定报警的定义和规范要求,详细分析了各种类型船舶舵机液压锁定报警原理,总结了该报警的原因和测试方法,本文可为船舶轮机人员和相关的轮机管理者提供一定的借鉴和参考。 相似文献
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介绍了我国港口资源的整合现状,指出港口整合可以提升港口的形象和地位,也为区域经济和城市的发展注入强大的动力。最后指出在港口资源整合中要避免的几个问题。 相似文献
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广州集装箱码头的轮胎式场桥小车制动器使用10多年后,出现了许多问题,故进行了改造.分析了轮胎式集装箱龙门起重机小车制动器的主要故障现象,提出了改造方案,并加以实施. 相似文献
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本文对现有的选定球面轴承的三种工程方法进行了分析比较.引入了“合力系数”,并给出了合力方向上投影面积的精确解. 相似文献
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分析柴油机故障中常见的机体裂纹故障原因,认为由于设计缺陷和管理及操作不当,易造成船舶柴油机缸体上的裂纹多发生在气缸套凸肩处。如不及时处理这些裂纹和故障,就会造成缸套的裂纹直至出现缸套漏水等严重后果,针对NANTAIQUEEN轮柴油机对该类型故障的检修提出具体措施。 相似文献
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The hydrophysical and hydrochemical structure of the Sea of Azov, with developed bottom anoxia, was studied during the RV “Akvanavt” cruise from July 31 to August 03, 2001. The anoxic zone with a thickness from 0.5 to 4 m above the bottom was found in all deep regions of the Sea. Concentrations of hydrochemical parameters were similar to the pronounced anoxic conditions (about 90 mmol m− 3 of hydrogen sulfide, 17 mmol m− 3 of ammonia, 6 mmol m− 3 of phosphate, 7 mmol m− 3 of total manganese). The hydrophysical structure was characterized by the uniform distribution of temperature in the upper 6–7 m mixed layer (UML). Below this a thin (0.4–0.8 m) thermocline layer was observed, just above the anoxic waters. Formation of this phenomenon was connected with that summer weather conditions. Intensive rains led to increased influx of river waters in June. That resulted in large input of allochtonous organic matter (OM) and inorganic nutrients; the latter were consumed on the additional autochthonous organic matter production. In July the weather was characterized by a significant rise in the daily averaged air temperature and large oscillations of temperature during the day. In this period a wind of constant direction was absent, but wind bursts were observed. The completed analyses showed that the formation of such a structure could be connected with the following factors: (i) positive growth trends of the daily averaged temperature and the daily oscillations of temperature, (ii) presence of wind bursts. The joint action of these factors resulted in the formation of the UML. The amplitude of wind bursts determined the depth of UML, and the value of trend determined the value of the temperature change in the thermocline. An initial presence of bottom halocline (caused by the Black Sea water influx to the bottom of the Sea of Azov) prevented the heating of the bottom layer and therefore led to an increase of vertical gradient of temperature in the thermocline. The spatial distribution of the turbulent exchange coefficient confirmed the existence of a “stagnation” area located above the anoxia zone, which is also, apparently, the reason for its occurrence. 相似文献