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日照港西港区件杂货码头QLY25B型轮胎式起重机经过数年使用,近年行走机构故障频发,尤其是行走减速箱部分齿轮磨损严重,必须进行改造。阐述了起重机行走减速箱工作原理,分析了故障原因,提出了改进措施。改造后的行走减速箱使用良好,行走机构故障率明显下降。 相似文献
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舰船行星齿轮减速箱是舰船动力系统的重要组成部分,负责舰船的发动机速度调节。行星齿轮减速箱具有结构强度大,刚度大,可靠性高等优点。传统的行星齿轮减速箱动力学分析中,通常将减速箱视为一个刚体,忽略了齿轮减速箱的阻尼特性。由于行星齿轮减速箱在实际工作过程中某些构件的变形量很大,这部分结构采用刚体理论分析精确度较差。本文对船舶行星齿轮减速箱的阻尼特性进行系统的研究,结合Matlab仿真平台探究了行星齿轮减速箱的阻尼仿真。 相似文献
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大功率行星齿轮减速箱是船舶轮机系统的重要设备之一,由于减速箱在工作中承受的载荷大,且转速高、工作环境复杂,因此,舰船行星齿轮减速箱往往会出现噪声、振动和失稳等问题,影响舰船的正常运行。阻尼特性是弹性材料的一种特性,基于阻尼特性进行机械结构设计具有改善振动与噪声等优点,本文首先针对舰船行星齿轮的阻尼系统进行了阻尼建模,然后基于Ansys和Hypermesh等软件进行了行星齿轮减速箱的建模和有限元仿真,对改善行星齿轮减速箱的振动噪声等性能有重要的作用。 相似文献
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分析了门座起重机回转机构摆线针轮减速箱异响、传动无力等故障的原因,对回转机构减速箱的强制润滑系统进行了改进,保证了回转减速箱左右旋转工作的全过程润滑;增设了润滑压力传感系统对减速箱的强制润滑进行预警,大大改善了摆线针轮减速箱的运行状况。 相似文献
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针对某煤炭码头带式输送机的减速箱崩齿故障,分别从功率校核、使用习惯、维护保养情况、润滑油、齿轮轴选型、齿轮硬度、设计因素、对中情况等方面进行分析,得出可能造成减速箱崩齿的原因. 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
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