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为探索船舶柴油机连杆伸腿事故原因对船舶柴油机连杆螺栓的材料和结构特点、连杆螺栓受力等进行了深入探讨,在此基础上进一步综合分析了螺栓断裂的原因。为此,提出了防止连杆螺栓断裂管理要点,对保证船舶和人命安全,降低事故率有重大现实意义。 相似文献
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柴油机斜切连杆的大端的紧固螺栓是柴油机重要联接螺栓,由于连杆自身的运动和受力比较复杂,导致螺栓的损坏时有发生,从船员的反映情况看,人为的装配和使用不当是螺栓损坏的重要因素,一旦紧固螺栓发生断裂性事故,其后果不堪设想,本文从连杆的受力和人为的两个角度出发,论述其损坏原因。 相似文献
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柴油机连杆部件变形和曲轴红套处滑移的修理工艺 总被引:3,自引:1,他引:2
文章结合实际介绍了柴油机连杆变形的检查方法、连杆变形的校正方法、连杆大端轴承内孔变形的修复工艺、连杆螺栓防断裂措施、连杆螺栓的维护措施等连杆部件修理工艺和曲轴红套处滑移的修理工艺。 相似文献
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《船舶标准化工程师》2017,(4)
目前大型的船用低速柴油机都是用主机底脚螺栓进行固定,对底脚螺栓孔的开孔方式都以传统的钻孔为主,此类开孔方式时间长,消耗大,劳动强度高。文章详细介绍了江南长兴造船的新型主机底脚螺栓孔开孔工艺,新工艺采用火焰切割的方法,质量上能够满足主机底脚螺栓的安装要求,同时具有速度快、成本低等优点。 相似文献
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随着造船工业的发展,特别是通过承造万吨级出口船舶,我国造船工艺水平有了一定提高。本文仅就主机轴系安装工艺方面的现状综述于下: 一、主机安装215艺1.主机座板钻孔低速重型柴油机的底脚螺栓孔,数量甚多,例如B&W 6L67GFG机有M56底脚螺栓136只,均为松配螺栓。为了提高抗疲劳强度和防止运行中松动,底脚螺栓设计成加长型,其下部采用可调球螺母,机座左右和后部布置支撑,此时,底脚螺栓孔的钻孔方法有二: 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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