热电厂输煤传送带控制系统 二

^论文字数:19303,页数:38  附任务书，开题报告，文献综述，电路原理图

摘  要:卸煤及上煤控制系统是热电厂中较为庞大的一个公用系统,它的输送过程是通过皮带输送机来完成,整个系统由多台输送距离较长的带式输送机串接而成.这种皮带运输机在建材、化工、食品、机械、钢铁、冶金、煤矿等生产中得到广泛使用.由于传统的继电器控制陈旧而且存在众多弊端,在设计中,本人采用了PLC控制.
  该卸煤及上煤系统采用了三菱公司的FX2N系列PLC作为控制核心.整个系统采用了两台互不相通信的PLC控制12台皮带机，两台PLC分设两个控制室.一控室的PLC控制1～3号皮带机,完成卸煤任务;二控室的PLC控制4～7号及0号皮带机,其中4～7号皮带机有A、B两条输送线,完成上煤任务.整个系统控制具有单机和联动控制选择、路径选择、系统起停指令和故障报警.并且在所有梨煤机上装设有接近开关,控制其处于工作或停止状态的显示.等功能,联锁控制方便.另外,由于该卸煤及上煤系统现场受控设备繁多,为了便于运行人员能在控制室及时地了解现场设备运行的情况.本设计配置了指示灯来显示运行情况.
  本系统采用了PLC为控制核心,基本上解决了传统的继电器控制逻辑所存在的弊端,利用到现场,可以减轻运行人员的劳动强度,提高工作效率和安全经济运行水平.
 关键词:可编程逻辑控制器    联锁控制     继电器控制逻辑
      
   Unloads the coal and goes up the coal control system in the heat and power plant
 Abstract: Unloading coal and the going up coal control system to be a public system comparatively huge in the heat and power plant ,its transport course is accomplishing byes way of the leather belt conveyer ,and the whole system carries the longer ribbon conveyer of distance to be gone here and there and come into contact with by many, this kind of leather belt transport plane gets extensively the use in builing productions such as material, chemical industry, foodstuff, machinery, iron and steel, metallurgy and coal mine etc. The bang﹣bang control owing to the tradition is outmoded and exists multitudinous malpractices, and I adopted PLC to control in the design.
   Unloading coal and the going up coal measures should be unloading all to adopt three FX2N’s series of ling company PLCs as controlling the nucleus. PLC that the whole system adopted two tai not to communicate by letter mutually controls 12 tai leather belt machines ,and two tai PLCs set up tow control rooms. PLC of  the first control room controls the leather belt machine of 1﹣3, and accomplishes unloading the coal assignment; PLC of the second control room control 4﹣7 and the leather belt machine of 0, among them the leather belt machines of 4﹣7 have two transport threads A and Bs, and accomplish the coal assignment. The whole system control possesses the mono-device and linkages to be controlled selection, route selection and system rising to stop instruction and the trouble warning and installs the proximity switch at all plough coals on the machine, and his is in work or stops the demonstration of state control. Waiting the function, it is convenient that the interlock is controlled. Moreover owing to should unload to be controlled equipment various at coal and going up coal measures all scene, and runs personnel in order to be easy to can understand the equipment operating circumstance at scene in the control room in time. This design was disposed the pilot lamp and was come the display device operating circumstances.
   This system adopted PLC to serve control nucleus, and solved the malpractice that the bang﹣bang control of the tradition logic exists basically, and uses to the scene, and can lighten labour intensity that runs personnel, and raises work efficiency and safety economy operating standard.
Keyword:  Programmable logic controller   Interlock control   Bang﹣bang control logic   

目录
 
 摘要………………………………………………………………………………I
 Abstract…………………………………………………………………………II
第1章 绪论……………………………………………………………………1
 1.1电厂输煤传送带控制系统的历史…………………………………1
 1.2 电厂输煤传送带控制系统的技术特点………………………………1
第2章 带式输送机……………………………………………………………3
 2.1 带式输送机的优点及选型布置………………………………………3
  2.1.1 输送机的优点………………………………………………………3
  2.1.2 带式输送机的选型布置……………………………………………3
  2.2 输送带的维护…………………………………………………………4
 第3章 PLC控制系统设计……………………………………………………7
    3.1 系统分析与调研………………………………………………………7
    3.2 系统总体方案设计……………………………………………………7
  3.2.1 系统总体方案设计的主要内容……………………………………7
    3.3可编程序控制器的选择………………………………………………9
  3.3.1 明确目标……………………………………………………………10
  3.3.2 控制方式选择………………………………………………………10
  3.3.3 实时性………………………………………………………………10
  3.3.4 功能选择……………………………………………………………10
  3.3.5 输入/输出模块选择………………………………………………10
  3.3.6 确定 I/O 点数……………………………………………………11
  3.3.7 存储器类型及其容量选择…………………………………………11
  3.3.8 控制系统结构………………………………………………………11
  3.4 PLC控制系统的设计流程………………………………………………12
    3.5 硬件电路设计…………………………………………………………15
   3.5.1 元件的选择…………………………………………………………15
  3.5.2 外部电路设计………………………………………………………18
    3.6 软件设计………………………………………………………………19
  3.6.1 控制要求……………………………………………………………19
  3.6.2 确定 I/O 地址表……………………………………………………20
  3.6.3 控制系统程序流程分析与设计……………………………………21
    3.7 控制版面设计…………………………………………………………29
 参考文献…………………………………………………………………………31
 结束语……………………………………………………………………………32
 致谢………………………………………………………………………………33
 附录………………………………………………………………………………34
附录A    卸煤系统梯形图及指令表
附录B    上煤系统梯形图及指令表
附录C    卸煤系统接线图
附录D    上煤系统接线图

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