测控技术与仪器毕设_论文_焊接冷却水的温度控制.docVIP

天津职业技术师范大学 Tianjin University of Technology and Education 毕 业 设 计 专 业： 测控技术与仪器 班级学号： 测控0702班 - 20 学生姓名： 卢富志 指导教师： 张思祥 教授 二〇一一年六月 天津职业技术师范大学本科生毕业设计 焊接冷却水的温度控制 Welding of cooling water temperature control 专业班级：测控0702班 学生姓名：卢富志 指导教师：张思祥 教授 学 院：自动化与电气工程学院 2011年6月 摘 要 不锈钢复合板是一种以碳钢为基材，不锈钢等钢材为副材，两种金属经滚焊成型的高效节能材料。它的主要特点是碳钢和不锈钢形成牢固的冶金结合，可以进行热压、冷弯、切割、焊接等各种加工，有良好的工艺性能，材质和厚度可以自由组合，满足不同用户的需要。它充分发挥两种材料特性优势，即具有不锈钢的耐腐蚀，耐磨性，抗磁性，豪华性和装饰性；又具有碳钢良好的可焊性，成型性，拉延性和导热性，因而它是一种多功能材料。同时由于它可节约镍铬合金，可降低成本，价格低廉，作为一种资源节约型的产品，减少贵重金属的消耗，大幅度降低工程造价，实现低成本和高性能的完美结合。因而已经被广泛应用于石油、化工、盐业、水利电力等行业，用于取代全不锈钢，具有巨大的社会经济效益。 本论文主要研究两种金属经滚焊过程中冷却水温度的控制。当冷却水的实际温度产生变化时，装置通过温度检测单元将测出的温度信号转换成电信号，经A/D转换，送至PLC,经过PID控制算法计算后由D/A单元输出给变频器。变频器再通过输出不同的电压及频率来控制给水泵的转速，从而改变给水泵的供水量。 关键词：Pt100温度传感器；PLC；MM440变频器；水泵 ABSTRACT Stainless steel composite board is a kind of carbon steel as base material, stainless steel as vice material, welding the two metals by roll forming energy-efficient materials.Its main feature is the Metallurgical bond of solid carbon steel and stainless steel, metallurgical bonding can be hot, cold, cutting, welding and other processing, a good process performance, material and thickness can be freely combined, to meet the needs of different users. It features full advantage of the two materials, which have stainless steel corrosion resistance, wear resistance, anti-magnetic, luxury and decoration; but also has good weld ability of carbon steel, molding, drawing ductility and thermal conductivity, so it is a multifunctional material. And because it can save nickel-chromium alloy, can reduce costs, low prices, as a resource-saving products, to reduce the consumption of precious metals, a significant reduction in project cost, to achieve the perfect combination of low cost and high performance. Which has been widely used in petroleum, chemical, salt, water conservancy and electric power industries, to replace stainless steel, with great social and economic benefits. In this t