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實(shí)驗(yàn)室用高速冷凍離心機(jī)結(jié)構(gòu)分析

時(shí)間:2011/10/14閱讀:567
分享:
      高速冷凍離心機(jī)主要是從液體混合物中提煉出需要的成分,根據(jù)每種物質(zhì)的密度不同,經(jīng)過高速旋轉(zhuǎn),密度大的液體沉在底層,密度小的液體浮在上面,這樣就將液體分層,提煉出我們所需要的純凈物。它應(yīng)用于醫(yī)藥、化工等許多領(lǐng)域。
    系統(tǒng)輸入有兩個(gè):轉(zhuǎn)速輸入和溫度輸入。轉(zhuǎn)速由光碼測量,每轉(zhuǎn)輸出六個(gè)脈沖,其控制采用上述算法。溫度由ADS90測量,當(dāng)溫度高于設(shè)定值2。C時(shí),壓縮機(jī)啟動(dòng);當(dāng)溫度低于設(shè)定值2~C時(shí),壓縮機(jī)停止。另外,系統(tǒng)有時(shí)間控制,當(dāng)電機(jī)轉(zhuǎn)速超過500轉(zhuǎn)時(shí)開始計(jì)時(shí)。當(dāng)計(jì)時(shí)達(dá)到設(shè)定時(shí)間時(shí)停機(jī)。系統(tǒng)輸出有繼電器輸出的變頻器啟/停、壓縮機(jī)啟停、門鎖控制和D/A輸出的0—5V或0一IOV的電壓控制轉(zhuǎn)速。故障檢測有變頻器故障、開門故障、失衡故障、超溫故障、超速故障。系統(tǒng)設(shè)有看門狗。
    1高速冷凍離心機(jī)軟件流程
    在樣機(jī)調(diào)試中已確定了七種轉(zhuǎn)子型號的控制子程序,適合于幾千轉(zhuǎn)至三萬轉(zhuǎn)的轉(zhuǎn)子。在應(yīng)用中,用戶只需通過鍵盤輸入用戶所使用的轉(zhuǎn)子型號。
    2系統(tǒng)運(yùn)行結(jié)果
    出控制失靈及系統(tǒng)機(jī)械故障等應(yīng)能及時(shí)檢測并報(bào)警,關(guān)閉所有控制對象,使系統(tǒng)損失減到zui小。同時(shí)在檢測到一些對生產(chǎn)不造成影響的故障如按鍵損壞、顯示不正常等,則應(yīng)報(bào)警提示操作員,但不停止生產(chǎn)
    液壓機(jī)實(shí)現(xiàn)壓力平衡的方式采用的是加壓與泄壓并存進(jìn)行的。當(dāng)壓差(需要壓力一實(shí)際壓力)較大時(shí)采用強(qiáng)加壓、泄壓為零輸出方式;壓差較小時(shí)采用弱加壓、泄壓為零輸出方式;負(fù)壓(需要壓力一實(shí)際壓力為負(fù))時(shí)剛要用如壓為零、泄壓輸出方式。這個(gè)過程理論上較簡單,但實(shí)際控制過程中由于系統(tǒng)響應(yīng)滯后現(xiàn)象產(chǎn)生,其算法應(yīng)在現(xiàn)場實(shí)際調(diào)試中加以調(diào)整,以求得zui為滿意的控制結(jié)果。
    3調(diào)試中出現(xiàn)的問題及解決方法
    (1)由于該生產(chǎn)車間的旁邊有一工頻淬火爐及一電焊車問,工業(yè)干擾較嚴(yán)重,對系統(tǒng)正常工作帶來根大影響,經(jīng)常使程序出現(xiàn)“跑飛”現(xiàn)象。為此,我們采取了一些抗干擾措施。其中包括:
    a.軟件抗干擾措施;
    b.硬件上除了采用白復(fù)位措施外,又加強(qiáng)了屏蔽隔離措施;
    c.采用獨(dú)立電源(和干擾源分相)或加裝UPS電源;
    d.繼電器線圈上加IRC吸收電路。有了這些措施后,系統(tǒng)即正常工作,再未出來過死機(jī)現(xiàn)象。
    (2)采樣信號不穩(wěn),影響了控制的可靠性。由于干擾嚴(yán)重,影響到輸^級信號的穩(wěn)定,導(dǎo)致采樣信號出現(xiàn)虛假現(xiàn)象,引起了誤動(dòng)作。我們根據(jù)現(xiàn)場中出現(xiàn)的現(xiàn)象進(jìn)行分析,zui后在前級加上硬件濾波電路解決了這一問題。

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