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毕业设计[论文]题目：选煤厂压滤机控制系统系别：电气与电子工程系专业：电气工程及其自动化姓名：杨伟学号：1214040514指导教师：王广1成绩评定·毕业设计（论文）成绩评定成绩评定说明一、答辩前每个学生都要将自己的毕业设计（论文）在指定的时间内交给指导，教师，由指导教师审阅，写出评语并预评分。二、答辩工作结束后，答辩小组应举行专门会议按学校统一的评分标准和评分办法，在参考指导教师预评结果的基础上，评定每个学生的成绩。系对专业答辩小组提出的优秀和不及格的毕业设计（论文），要组织系级答辩,最终确定成绩，并向学生公布。三、各专业学生的最后成绩应符合正态分布规律。四、具体评分标准和办法见《平顶山工学院毕业设计（论文）工作条例》中附录2。五、答辩小组评分包括两部分：（1）学生答辩情况的得分和评阅教师评分；（2）指导教师对学生毕业设计（论文）的评分班级姓名学号综合成绩：分（折合等级）答辩小组组长签字年月日2成绩评定·毕业设计（论文）成绩评定成绩评定说明一、答辩前每个学生都要将自己的毕业设计（论文）在指定的时间内交给指导，教师，由指导教师审阅，写出评语并预评分。二、答辩工作结束后，答辩小组应举行专门会议按学校统一的评分标准和评分办法，在参考指导教师预评结果的基础上，评定每个学生的成绩。系对专业答辩小组提出的优秀和不及格的毕业设计（论文），要组织系级答辩,最终确定成绩，并向学生公布。三、各专业学生的最后成绩应符合正态分布规律。四、具体评分标准和办法见《平顶山工学院毕业设计（论文）工作条例》中附录2。五、答辩小组评分包括两部分：（1）学生答辩情况的得分和评阅教师评分；（2）指导教师对学生毕业设计（论文）的评分班级姓名学号综合成绩：分（折合等级）答辩小组组长签字年月日3·答辩小组评定意见·一、评语（根据学生答辩情况及其论文质量综合评定）。二、评分（按下表要求评定）评分项目答辩小组评分评阅教师评分合计（40分）完成任务情况（5分）毕业设计（论文）质量（5分）表达情况（5分）回答问题情况（5分）质量（正确性、条理性、创造性、实用性）（10分）成果的技术水平（科学性、系统性）（10分）答辩小组成员签字年月日毕业答辩说明1、答辩前，答辩小组成员应详细审阅每个答辩学生的毕业设计（论文），为答辩做好准备，并根据毕业设计（论文）质量标准给出实际得分。2、严肃认真组织答辩，公平、公正地给出答辩成绩。3、指导教师应参加所指导学生的答辩，但在评定其成绩时宜回避。4、答辩中要有专人作好答辩记录。。4·指导教师评定意见·一、对毕业设计（论文）的学术评语（应具体、准确、实事求是）：签字：年月日二、对毕业设计（论文）评分[按下表要求综合评定]。（1）理工科评分表评分项目（分值）工作态度与纪律（10分）毕业设计（论文）完成任务情况与水平（工作量与质量）（20分）独立工作能力（10分）基础理论和基本技能（10分）创新能力（10分）合计（60分）得分（2）文科评分表评分项目（分值）文献阅读与文献综述（10分）外文翻译（10分）论文撰写质量（10分）学习态度（10分）学术水平（20）论证能力与创新（40分）合计（100分）得分指导教师签字：年月日5摘要·····························································································6ABSTRACT···················································································7第一章压滤机概述········································································8第一节压滤机的发展及现状·········································································8第二节压滤机的主要结构············································································9第二章可编程序控制器（PLC）的概况··············································10第一节PLC的概念及发展·········································································10一、PLC发展回顾···············································································10二、PLC发展过程···············································································11三、PLC在中国的发展··········································································12四、PLC的现状···················································································12五、PLC的发展趋势············································································14六、软PLC技术··················································································15第二节可编程序控制器的结构及工作原理······················································15一、可编程序控制器的基本结构·····························································16二、可编程序控制器的工作原理·····························································17三、PLC的应用领域·············································································19四、可编程序控制器与计算机之间的通信·················································20第三章压滤机控制系统总体设计·····················································20第一节压滤机控制系统流程图·····································································20第二节压滤机控制系统的设计中还应考虑其它因素：······································22第四章PLC的选型·········································································22第一节压滤机控制系统的工作过程分析·························································22第二节可编程序控制器PLC的选型·····························································23一、可编程序控制器物理结构及控制方式的选择········································24二、CPU的能力··················································································25三、I/O点数的确定············································································25四、响应速度····················································································26五、存储容量的选择···········································································27六、可编程序控制器的指令系统·····························································28七、机型选择的其他考虑······································································28八、FX2n-48MR-001型PLC···································································29第五章硬件设计············································································31第一节PLC的使用环境···············································································31一、物理环境····················································································32二、电气环境·····················································································32第二节电动机的选型·················································································32第三节压滤机控制系统所用电器的选型·························································33一、按钮··························································································33二、接近开关·····················································································34三、拉线开关·····················································································37四、接触器························································································38五、热继电器····················································································40六、中间继电器···························