摘 要

維卡水泥檢測儀是一種檢測儀器，用于水泥凝結時間的測定。水泥的凝結時間是水泥的重要參數(shù)，而我國目前關于水泥凝結時間測定的技術水平很低，甚至基本上停留在手工操作階段，這種測試方式不僅操作人員勞動強度高，而且測試結果受人為因素影響很大。國外雖然出現(xiàn)了自動維卡儀，可以實現(xiàn)測試過程的自動化，可是測試方法并不符合標準；測試結果需要經(jīng)過人工分寫得出，受到一定認為因素的影響；測試儀器不滿足水泥凝結時間測試對溫度、濕度的要求。因此，研制能滿足水泥凝結時間測試國家標準、操作方便、測試精度高、測試結果能自動分析的全自動維卡儀器，對提高水泥檢測的自動化水平和檢測質(zhì)量具有十分重要的工程實用價值。
本文對現(xiàn)有的手動式維卡儀的工作原理和性能特點對比分析，指出了其存在的缺陷和急需解決的問題。在此基礎上，進行了以下研究工作：
模仿人工測試，進行相應的機構設計。采用機電一體化技術，實現(xiàn)了凝結時間測定過程的自動化；
針對國外維卡儀不能準確測得試針的沉入深度，首次提出了“自找平技術”和現(xiàn)代傳感器技術應用于試針沉入深度的測定，通過自找平裝置的設計和容柵位移傳感器的安裝設計，實現(xiàn)了試針每一個沉入深度的精確測定；
針對國外維卡水泥檢測儀需要人工進行采集分析得出凝結時間，提出了數(shù)據(jù)自動分析和處理。通過軟件設計對傳感器采集的數(shù)據(jù)適時分析，實現(xiàn)了實驗的自動結束，提高了測試效率；對數(shù)據(jù)組的自動分析計算，實現(xiàn)了初凝和終凝時間的精確測定，從此形成真正意義上的全自動維卡儀。
該儀器的研制成功不但填補了國內(nèi)空白，而且技術上優(yōu)于國外的自動維卡儀，價格確只有國外自動維卡儀的三分之一，不僅滿足了廣大客戶的需要，而且也代表了普通實驗室最先進經(jīng)濟的解決方案。
關鍵詞：維卡儀，水泥，容柵傳感器，機電一體化，自動測試。








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 錄

中文摘要 Ⅰ
ABSTRACT Ⅱ
1緒論 1
1.1問題得提出及研究意義 1
1.1.1問題的提出 1
1.1.2研究的意義 1
1.2國內(nèi)外維卡儀的研究現(xiàn)狀 1
1.3本課題所設計的維卡水泥見檢測儀的.原理 2
1.4課題任務 3
1.5重點研究內(nèi)容 3
1.6實現(xiàn)途徑 3
2全自動維卡儀關鍵技術的研究 5
2.1自找平技術 5
2.1.1自動找平信號產(chǎn)生的研究 5
2.1.2試針停留在水泥表面準確度的研究 6
2.2位移傳感器的應用研究 7
2.2.1位移傳感器的選擇 7
2.2.2容柵傳感器的作用原理及特點 8
2.2.3容柵位移傳感器應用于全自動維卡儀的適宜性研究 11
2.2.4容柵位移傳感器在維卡儀上的定位于安裝設計 12
2.3數(shù)據(jù)自動分析的應用研究 13
2.4本章小結 14
3全自動維卡儀各執(zhí)行機構設計及外觀設計 15
3.1總體設計 15
3.2試針起升和釋放機構設計 15
3.3.試模移位機構設計 17
3.4插針機構設計 18
3.5機構外殼設計 19
3.6保濕箱設..