文档介绍：课程设计说明书
(液压油缸的压力和速度控制)
班级:机自07-1班
姓名:卢锋
学号:10074789
日期:
目录
1、设计课题· ····································· 3
······································ 3
······································ 3
······································ 3
······································ 3
2、设计方案······································ 4
································· 4
······································ 6
3、机械部分计算······································ 9
······························ 9
······································ 12
····································· 15
····································· 17
4 、系统的验算····································· 20
····································· 20
系统温升的验算····································· 21
5、电气部分设计····································· 23
····································· 23
····································· 24
1 设计课题
设计目的
通过课程设计培养学生综合运用所学知识和技能、提高分析和解决实际问题能力的一个重要环节,专业课程设计是建立在专业基础课和专业方向课的基础上的,是学生根据所学课程进行的工程基本训练,课程设计的目的在于:
1、培养学生综合运用所学的基础理论和专业知识,独立进行机电控制系统(产品)的初步设计工作,并结合设计或试验研究课题进一步巩固和扩大知识领域。
2、培养学生搜集、阅读和综合分析参考资料,运用各种标准和工具书籍以及编写技术文件的能力,提高计算、绘图等基本技能。
3、培养学生掌握机电产品设计的一般程序和方法,进行工程师基本素质的训练。
4、树立正确的设计思想及严肃认真的工作作风。
执行元件:液压油缸;
传动方式:电液比例控制;
控制方式:PLC控制;
控制要求:速度控制;
控制精度:
油缸工作行程——600 mm;
额定工作油压——;
移动负载质量——1000 kg;
负载移动阻力——5000 N;
移动速度控制——;
设计方案
利用设计参数和控制要求设计出液压油缸,进而设计出液压系统,通过PLC对液压油缸进行速度控制。
2 设计方案
首先根据已知条件,绘制运动部件的速度循环图,。然后计算个阶段的外负载并绘制负载图。
液压缸所受负载F包括有效工作负载,摩擦阻力和惯性力三种类型,即
(2-1)
式中——有效工作负载,在本设计中即为题目给定的负载移动阻力Fw=5000N;
——运动部件速度变化时的惯性负载;
——导轨摩擦阻力负载,启动时为静摩擦阻力,启动后为动摩擦阻力,对于平导轨可由下式求得
——运动部件重力;
——垂直于导轨的工作负载,本设计中为零;
——导轨摩擦系数,,
(2-2)
(2-3)
上式中为静摩擦阻力,为动摩擦阻力。
(2-4)
式中 m——负载质量
——加速或减速时间,本次设计中取;
——时间内的速度变化量,,取=;
在本设计中
(2-5)
计算结果
Fw=5000N