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岸桥作为装卸集装箱的专业设备,在现代化集装箱码头得到广泛应用。集装箱码头岸桥吊具电缆卷盘系统一般选用丹佛斯VLT 5000变频器,该变频器运行不稳定,经常出现故障,加之其结构紧凑,造成拆装复杂、维修困难且耗时较长等问题。考虑到码头作业的时效性,用运行稳定的ABB 800变频器取代丹佛斯VLT 5000变频器来驱动吊具电缆卷盘系统电机。 相似文献
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为了精确、有效地控制岸桥吊具电缆卷盘系统,并降低卷盘系统内变频器的采购成本,缩短变频器的供货周期,以加拿大HALIFAX岸桥项目的吊具电缆卷盘系统为对象,将三菱FR-A800变频器应用于该系统中。基于吊具电缆卷盘的运行特性,设计FR-A800变频器的硬件、主回路和控制回路,并利用FR Configurator 2软件设置变频器的相应参数,对吊具电缆卷盘系统进行调试和波形分析。实际应用的结果表明,与西门子PM240变频器相比,在应用该变频器后吊具电缆的跟随性和系统的稳定性有所改善,且该变频器的经济性也更佳。 相似文献
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为了解决磁滞式电缆卷盘驱动装置经常因电缆松缆造成设备停机或电缆损坏等问题,对驱动装置故障原因进行分析。针对不同的故障类型,分别从驱动装置的结构型式和PLC程序控制方式上进行优化改进,防止电缆松缆,从而降低电缆卷盘驱动装置的故障率。 相似文献
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目前,全变频吊具电缆卷筒系统已在港口生产中得到广泛应用,但在控制方式以及机械结构上仍存在不足,表现为系统控制电路复杂,故障环节较多,极易发生系统故障,掉电缆、损坏电缆事故,时常造成岸边集装箱起重机(以下简称岸桥)长时间停机现象.本文根据实际工况设计实施了一套新的吊具卷缆系统.该系统使用带编码器的变频电机进行闭环控制,机械机构以卷筒与缓冲器配合使用,通过机车PLC控制程序,根据不同工况输出力矩给定至变频器,变频器驱动电机,通过减速箱直接带动卷筒.这种控制方式有效提高了系统的运行可靠性. 相似文献
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本文是针对安川电控系统集装箱桥吊吊具电缆采用两种配置的DTC电动卷缆子系统在使用过程中发现的缺陷而进行的改造.通过修改安川PLC主程序,实现了用软件代替吊具卷缆系统力矩给定硬件的思想.节约了成本,提高了稳定性与可靠性.实践证明,改造后的卷缆系统工作稳定可靠,值得同类设备推广应用. 相似文献
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正岸边集装箱起重机(以下简称"岸桥")大车电缆卷盘系统是为岸桥整机提供动力电源的装置。作为岸桥大车行走系统的重要组成部分,大车机构和电缆供电装置是决定岸桥使用率的关键因素。为了降低岸桥大车电缆卷盘系统故障率,提高岸桥整体效率,在系统中引入可编程逻辑控制器(programmable logic controller,PLC)全变频闭环控制模式,实现速度闭环控制,从而避免磁滞联轴器控制模式下的松缆故障,使岸桥运行更加稳定。 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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