电液伺服的蝶阀设计

机械设计制造及其自动化论文，论文编号:JX1131  论文字数:12663.页数:30

摘     要
 
 一般蝶阀开闭角度由一气动比例阀与气缸控制的。由于充液罐容积比较小，压机工作时充液罐的液面波动较大，而气动比例阀控制精度较低，且气动阀长期在高频率大行程状态下工作，导致气动控制阀和气缸内部元件损坏造成停产事故，严重影响生产，因此有必要进行改造。于是把40MN快锻机充液罐液位控制由原气动比例阀和气缸控制蝶阀开闭角度改成电液伺服阀和液压缸控制方式。
 第一章，介绍了目前蝶阀的发展状况、结构组成和工作原理；液压缸的选用原则；以及电液伺服连续系统的不同控制方式。
 第二章，具体地给出了整个控制系统的构成，画出了系统的控制原理简图，以及在整个系统中，信号的传递过程。
 第三章，明确地说明了各主要功能元件的工作原理和设计准则、选用准则，并画出了蝶阀和液压缸的结构原理图。尤其明确了所需蝶阀的各项技术指标，并计算出了其流量系数、最大流量、最大流速等重要数据。
 第四章，根据机械设计手册，主要对蝶阀、转轴等主要零件进行了设计。并对蝶阀主轴、转轴、液压缸、螺钉和键等关键零件做了强度校核，其结果都满足设计要求。
 第五章，对整个设计过程的一个回顾，并对系统应用的一个展望。
  
关键词：蝶阀控制系统  工作原理  液压缸
 

Abstract
 
 The opening and closing angle of butterfly valve was controlled by a pneumatic proportional valve and cylinder. Due to the smaller cubage of liquid-filled tank, the bigger undulation of filled tank at compressor working time, moreover, the lower control precision of pneumatic proportional valve, and pneumatic valve always works in big state of high frequency and long journeys, the internal components of pneumatic control valve and cylinder are damaged and this will caused shutdown accident, which seriously affects producing. So it is necessary to be made again.By improving the maintenance mode, the proposed liquid level control in the filled tank of 40MN quick forging machine will be changed form the original mode that the pneumatic proportional valve and cylinder control opening and closing angle of butterfly valve into electro-hydraulic servo valve and hydraulic oil tank control mode.
 In the first chapter, I give the current state of butterfly valve development, structure form and working principle of butterfly valve; selection principle of hydraulic oil tank; and the different control modes of the electro-hydraulic servo system.
 In the second chapter, I describe the structure of the entire control system in detail, and draw the sketch of the system control principle. And the signal’s delivery in the whole system.
 In the third chapter, I show a clear illustration of the main components of the functional principles and design criteria, selection criteria, and map out the structure theory drawing of the butterfly valve and the hydraulic oil tank. Particularly, I nail down the required technical targets of the butterfly valve, and calculate its flow coefficient, the largest flow, the largest flow velocity and other important data.
 In the fourth chapter, based on the mechanical design manual, I mainly design the right butterfly valve, shafts and other major components. As well as butterfly valve spindle, rotating shafts, hydraulic oil tank, bonds and screws, and other key components to do the intensity checking, and the results are to meet design requirements.
In the fifth chapter, I review the whole design process and application of a prospect.

Keywords：Butterfly Valve Control System；Principle；Cylinder

目  录
中文摘要 i
英文摘要 ii
目录 iii
第一章     绪论 1
 1.1  课题背景即国内外发展概况 1
 1.1.1  调节型蝶阀 1
 1.1.2  可曲挠伸缩式蝶阀 2
 1.1.3  阀门传动装置 3
 1.1.4  液压缸 4
 1.1.5  电液比例/伺服系统的控制方式 5
 1.1.6  连续控制系统 5
 1.2  课题的研究意义及研究内容 7
 1.2.1  课题的研究意义 7
 1.2.2  技术指标 7
第二章     系统的结构与组成 8
 2.1   系统构成 8
 2.2  各主要元件功能 9
第三章     工作原理 10
 3.1   蝶阀 10
 3.2  液压缸 13
 3.3  角度传感器 14
 3.4  蝶阀的安装与维护 16
 3.4.1  蝶阀的安装的注意事项 16
 3.4.2  蝶阀的使用维护注意事项 16
第四章     强度校核 17
 4.1   蝶阀的各项参数 17
 4.2  轴的设计与校核 17
 4.3  其它零件的校核 22
第五章     结论与展望 24
参考文献 25
致谢 26