桥式起重机电气控制系统设计毕业论文
2022-03-05 21:59:25
论文总字数:17181字
摘 要
社会在不断地进步,同时电子行业也与时俱进,变频器在控制系统中得到了更加广泛的运用。现代工业中,桥式起重机在搬运物料中扮演了重要的角色,大大提高了劳动生产的效率。过去常用的桥式起重机电气控制方法是在电动机的同一条支路中加电阻来控制电动的转速,这种控制方法的缺点是操作越来越复杂,效率降低,而且出现故障的频率也会不断升高,以及电能供应不足等缺点。
此次设计桥式起重机的电气控制系统运用到了两个设备,一个是可编程控制器,另一个是变频器。对于可编程控制器来说,它的特点作用非常的明确。首先它能够存储来自于内部的的程序,其次在操作方面有着较好的逻辑运算能力。控制方面按顺序来进行控制。外加一系列的用户操作指令,如定时计数。控制工业过程的过程经常用到PLC,这会让生产制造自动化完成,这样会大大提高操作精度和稳定度,综合保护能力完善,故障率低且便于查找,节约能源。
关键词:桥式起重机 变频器 变频调速 可编程控制器[3]
Design of electric control system for bridge crane
Abstract
Social progress continuously, and the electronics industry with the times, Frequency converter has been more widely used in the control system. In modern industry, bridge crane plays an important role in the handling of materials, greatly improve the labor productivity. The commonly used bridge type crane electrical control method is added in the same line of resistance branch motor to control the electric speed control method, the disadvantage of this operation is more complex, lower efficiency, and frequency of failure will also increase, and the power supply and other shortcomings.
The design of the bridge crane electrical control system applied to the two devices, a programmable controller, a frequency converter. The role of programmable controller is the main internal procedures for storage, operation logic operation, sequence control and counting arithmetic, to complete the operation of the user requirements in digital or analog form, control the production to the output from the output end. Process control of industrial process often used PLC, this will make the production automation, this will greatly improve the operation accuracy and stability, improve the comprehensive protection ability, low failure rate and easy to find and save energy.
Key words: Overhead traveling crane; frequency converter; frequency conversion speed regulation ;PLC
目录
摘 要 I
ABSTRACT..............................................................................................II
第一章 绪论 1
1.1桥式起重机简介 1
1.2桥式起重机现况与发展 2
1.3可编程控制器的特点与发展 3
1.4设计的内容目的 4
第二章 控制系统硬件设计 5
2.1控制系统的结构工作原理 5
2.1.1 桥式起重机控制系统总体结构..........................................................5
2.1.2 变频调速的基本原理..........................................................................6
2.1.3 桥式起重机的控制要求......................................................................8
2.2电路的硬件设计 10
2.2.1 桥式起重机的电气接线图................................................................10
2.2.2 桥式起重机的plc硬件接线..............................................................11
2.2.3 桥式起重机系统电路图....................................................................12
2.3可编程控制器 13
2.3.1 可编程控制器的基本解释 13
2.3.2 可编程控制器的基本结构 13
2.3.3 可编程控制器的基本特征 14
2.3.4 PLC的工作原理 14
2.3.5 S7-200系列PLC 15
2.4 继电器 15
2.5 PLC的选型 15
2.6 变频器的选择 16
2.6.1 变频器的选型....................................................................................16
2.6.2 变频器主要参数................................................................................16
2.6.3 变频器的结构....................................................................................17
2.7 地址分配 18
第三章 控制系统软件设计 19
3.1 编程软件 19
3.2 控制流程图设计 19
3.3 PLC控制顺序功能图设计 20
3.4 PLC程序设计 21
3.5 梯形图重点程序段落分析 23
第四章 总结与展望 29
4.1 总结 29
4.2 展望 29
致谢.....................................................................................................................30
参考文献............................................................................................................31
第一章 绪论
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