机械制造与自动化毕业论文3000字怎么写的

发个样例给你看看卡瓦的设计摘要本课题研究内容属于修井井口作业自动化系统中动力卡瓦的结构设计。课题主要目的就是用动力卡瓦实现对管柱的提升，卡紧及悬挂。设计中，利用液压缸施加作用力，经连杆机构的传递，推动卡瓦楔体沿卡瓦座体内锥面上下运动，上行时，卡瓦牙板内径不断增大，使管柱通过；下行时，卡瓦牙板收拢，内径变小，从而卡紧管柱。对于管柱的卡紧与悬挂，在井口作业中是一个重要的组成部分。动力卡瓦是卡住并悬挂下井的油管、钻杆、钻铤等管柱的必要工具，但是每一种结构的卡瓦都有它的优点和缺点。本课题主要是对动力卡瓦进行结构设计以及对动力卡瓦承载零件的受力分析和强度校核。关键词：卡瓦；结构；强度；悬挂能力AbstractThe content of this research are workover operations wellhead automation system dynamics of the structural design of S The main purpose of the subject is to use power to achieve string slips upgrading cards and hanging Design, use of force to exert hydraulic cylinder, the transmission linkage, and promote slips kava wedge blocks along the upper and lower body movement cone, on the line, slips increasing diameter of dental lamina, so that through the string; downlink, the slips drawing in dental lamina, smaller diameter, thereby card string For the string tight and the suspension of the card, operating in well-head is an important Driving force for slips is jammed and flying to go down the pipeline, drill pipe, drill collar, such as an essential tool string, but the structure of each slip has its own advantages and The main issue is the driving force for the structural design of Slips and Slips bearing parts of the power and strength check of force Key words: slips; Structure; Strength; Hoisting capacity三人行资料网提供！打字不易，如满意，望采纳。