本科毕业论文(设计)
题 目基于西门子PLC洗碗机控制系统设计
学 院 机电工程学院
专 业 机械设计制造及其自动化
班 级 级4班
学 号
学生姓名 徐嘉伟
指引教师 谭栓斌
完毕日期 -04-28
西安思源学院教务处制
二〇一 四 年 四 月
摘要
在平时寻常生活中咱们避免不了要洗餐具,但是大某些人还是选取用手洗,因此设计出一种家用洗碗机是本次设计重要目。本设计在控制系统方面采用是西门子PLC控制,依照输入、输出端口数量来选取西门子PLCCPU详细型号。本设计输入端口总共12个,输出端口总共10个,因此选取CPU226型号PLC满足本设计规定。硬件选取方面,依照普通家用洗碗机铭牌可得知其额定功率和额定转速,再由公式可算得其额定转矩,依照此额定转矩查找有关资料可选取本设计所需电动机。电动机型号拟定后,依照电动机交流负载选取相应接触器,再依照公式算得接触器额定电流,查找有关资料选取接触器详细型号。热继电器和熔断器选取也是依照电动机额定电流,再依照公式算出其额定电流,根据其数值查找有关资料选取详细型号。软件选取方面,在编写程序之前先画好系统控制程序流程图,再用S7-200编程软件编写程序梯形图和语句表,再将编写好程序导入S7-200仿真软件中进入最后调试,检查洗碗机各个部件与否可以正常工作,如果浮现错误再修改相应程序,直至可以正常工作。
核心词:洗碗机 PLC 自动化
Abstract
In everyday life we can't avoid to wash the dishes,but most people still choose to use hand wash,so to design a home dishwasher is the main purpose of this design. This design used in the control system is Siemens PLC control,to select the CPU specific models Siemens PLC according to the number of input,output port. The design of a total of 12 input ports,output ports of a total of 10,so the choice of model CPU226 PLC meet the requirements of the design. The choice of hardware,according to the general household dishwasher nameplate can know its rated power and rated speed,then the formula can be considered as the rated torque Rated torque,according to the search for relevant information can be selected for the design of the motor. The motor model is established according to the motor AC load,select the corresponding contactor,then according to the rated current formulas of the contactor,the specific model to find relevant information selection. Thermal relay and fuse selection is according to the rated current of the motor,and according to the formula to calculate the rated current,on the basis of the numerical search for relevant information to choose the s
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