门座式起重机电气控制系统中起升部分的PLC设计-毕业设计.docx

毕 业 设 计学生姓名： 学 号：0110802219学 院：电气工程学院专 业： 自动化题 目：门座式起重机电气控制系统中起升部分的PLC设计指导教师：评阅教师：毕业设计中文摘要门座式起重机是港口码头数量和使用最多的、结构复杂、机构最多的、最典型的电动装卸机械。它具有较好的工作性能和独特的优越结构，通用性好，被广泛的应用于港口杂货码头。要求门座式起重机在不同的场合，用相对应的速度进行工作，它的目的在与是起重机在各种合理的速度下有效的工作，从而提高生产率并且确保安全生产。目前门座式起重机的电气控制由PLC和变频器配合来实现。交流变频调速相比其它起重机调速方案有明显的优点。首先，调速时平滑性好，效率高。低速时，特性静关率较高，相对稳定性好；其次，调速范围较大，精度高；再次，起动电流低，对系统及电网无冲击，节电效果明显。同时交流变频器体积小，便于安装、调试、维修简便，易于实现过程自动化。基于PLC的电气控制系统也具有可靠性高、抗干扰能力强、实时性好、安装简单、维修改造方便等优点。本论文以门座式起重机为背景，对门座式起重机起升部分的电气控制系统进行研究。主要内容包括主要供电线路设计，起升部分PLC程序的设计以及PLC与变频器的现场通讯研究。关键词 门座式起重机 PLC PROFIBUS 变频器毕业设计外文摘要Title Gantry crane electrical control system design of PLC lifting mechanismAbstractThe portal crane is the number of port terminal and use the most complex structure, organization the most, the most typical electric handling machinery. It has better performance and unique superior structure, common good, is widely used in port cargo terminal. The portal crane requirements on different occasions, with the corresponding speed work, its purpose and cranes at various reasonable speed work effectively to improve productivity and ensure safety in production.Currently electric door controlled by PLC and inverter to match the implementation. AC variable speed governor and other crane program, has obvious advantages. First, the governor smoothness, and high efficiency. At low speeds, the characteristics of static clearance rate is higher, the relative stability; Secondly, greater speed range, high precision; Again, low starting current, no impact on the system and the power grid, energy-saving effect is obvious. Meanwhile, AC drives small size, easy installation, commissioning, maintenance is simple and easy to implement process automation. PLC-based electrical control system also has high reliability, strong anti-jamming capability, real-time, simple installation, easy maintenance and reconstruction and so on.In this thesis, portal cranes in the background, door pedestal crane electrical control system up part