维卡水泥检测仪（本科毕业论文设计）.doc

摘 要

维卡水泥检测仪是一种检测仪器，用于水泥凝结时间的测定。水泥的凝结时间是水泥的重要参数，而我国目前关于水泥凝结时间测定的技术水平很低，甚至基本上停留在手工操作阶段，这种测试方式不仅操作人员劳动强度高，而且测试结果受人为因素影响很大。国外虽然出现了自动维卡仪，可以实现测试过程的自动化，可是测试方法并不符合标准；测试结果需要经过人工分写得出，受到一定认为因素的影响；测试仪器不满足水泥凝结时间测试对温度、湿度的要求。因此，研制能满足水泥凝结时间测试国家标准、操作方便、测试精度高、测试结果能自动分析的全自动维卡仪器，对提高水泥检测的自动化水平和检测质量具有十分重要的工程实用价值。
本文对现有的手动式维卡仪的工作原理和性能特点对比分析，指出了其存在的缺陷和急需解决的问题。在此基础上，进行了以下研究工作：
模仿人工测试，进行相应的机构设计。采用机电一体化技术，实现了凝结时间测定过程的自动化；
针对国外维卡仪不能准确测得试针的沉入深度，首次提出了“自找平技术”和现代传感器技术应用于试针沉入深度的测定，通过自找平装置的设计和容栅位移传感器的安装设计，实现了试针每一个沉入深度的精确测定；
针对国外维卡水泥检测仪需要人工进行采集分析得出凝结时间，提出了数据自动分析和处理。通过软件设计对传感器采集的数据适时分析，实现了实验的自动结束，提高了测试效率；对数据组的自动分析计算，实现了初凝和终凝时间的精确测定，从此形成真正意义上的全自动维卡仪。
该仪器的研制成功不但填补了国内空白，而且技术上优于国外的自动维卡仪，价格确只有国外自动维卡仪的三分之一，不仅满足了广大客户的需要，而且也代表了普通实验室最先进经济的解决方案。
关键词：维卡仪，水泥，容栅传感器，机电一体化，自动测试。








ABSTRACT

Vicat apparatus is a kind of testing instrument,used for measuring cement coagulation time which is one of the crucial parameters of cement performance.But at home the technical level about coagulation time is much low,basically remaining the level of manual operating. In this testing method, not only high labor intensity will be needed., but also will the man-made factors greatly affect on the testing results. Although automatic Vicat apparatus has been appearing ,achieving the automatization of testing course.However,this method don’t fit the testing standord;testing results analysised and gaided by workers are affected by man-made factors;instrument can’t satisfy the demand for tempreture with humidity of cement coagulation time.So, to develop full automatic Vicat apparatus with the character of fitting the testing standard, convenient operation,the high testing operation and auto-analyzing and computing the testing results, will be valuable to improve the automatic level and testing quality of cement testing.
This paper presents the comparative analasis of working principle and performance character between existing manual Vicat apparatus and automatic Vicat apparatus,pointing out the exsiting shortages and problem in dire need of solving.On this basis,following researches have been carried out:
Corrsponding mechanism has been designed,imitated manual testing.Mechatronice technology has been adopted to realize the mensuration course autoimmunization of coagulation time.
While overseas automatic Vicat apparatus can’t truly measure the inserting depth of testing pin,the technology of searching the right point automatically and modern sensor technology have been have been advanced for the first time to apply to the measuring of testing pin’inserching depth.Because of the design of serching the right point automatically device and installation desine of Capacitance-grate sisplacement transducers,accurate mensuration has been achieved for each inserting depth of testing pin.
This apparatus successfully developed not only fills up the demestic blank but also precedes the overseas automatic Vicat apparatus in technology,where its price is only as one third as overseas Vicat appatatus.It will bdelegate the solving scheme of the most advanced economy om ordinary laboratory as well as satisfy the demand vasr users.
Key words：Vicat apparatus,cement,capacitance-grating sensor,mechatronics,Automatic testing.






























目 录

中文摘要 Ⅰ
ABSTRACT Ⅱ
1绪论 1
1.1问题得提出及研究意义 1
1.1.1问题的提出 1
1.1.2研究的意义 1
1.2国内外维卡仪的研究现状 1
1.3本课题所设计的维卡水泥见检测仪的.原理 2
1.4课题任务 3
1.5重点研究内容 3
1.6实现途径 3
2全自动维卡仪关键技术的研究 5
2.1自找平技术 5
2.1.1自动找平信号产生的研究 5
2.1.2试针停留在水泥表面准确度的研究 6
2.2位移传感器的应用研究 7
2.2.1位移传感器的选择 7
2.2.2容栅传感器的作用原理及特点 8
2.2.3容栅位移传感器应用于全自动维卡仪的适宜性研究 11
2.2.4容栅位移传感器在维卡仪上的定位于安装设计 12
2.3数据自动分析的应用研究 13
2.4本章小结 14
3全自动维卡仪各执行机构设计及外观设计 15
3.1总体设计 15
3.2试针起升和释放机构设计 15
3.3.试模移位机构设计 17
3.4插针机构设计 18
3.5机构外壳设计 19
3.6保湿箱设..