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產品簡介
2711-NMCC 2711-NMCC
2711-NMCC 2711-NMCC
產品價格:¥99
上架日期:2015-09-08 10:04:16
產地:美國
發(fā)貨地:廈門
供應數量:不限
最少起訂:1個
瀏覽量:21
資料下載:暫無資料下載
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詳細說明

    2711-NMCC產品描述:

    2711-NMCC

    -----------------------------------------------------       
    廈門卡庫電氣有限公司
    嚴小姐
    電話:0592-5709823
    手機:18030229052
    傳真:0592-5709828
    誠信經營,質量為首,誠信至上,廈門卡庫電氣竭誠為您服務!
    ------------------------------------------------------


    廈門卡庫電氣有限公司實力雄厚,重信用、守合同、保證產品質量,以多品種經營特色和薄利多銷的原則,贏得了廣大客戶的信任。


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         1996年5月某廠擴建2號回轉窯700t/d熟料生產線,生料均化庫選用一座Φ15m×30m的混合室?guī)?,其充氣控制的初步設計方案是:選用空氣分配器。在建設過程中,通過實際考察,對PLC+電磁閥控制和空氣分配器方案進行比較: 1)空氣分配器控制充氣的時間是固定的,生產中不能根據工況的具體條件進行改變,均化的效果很難保證。而采用電磁閥控制,電磁閥的動作時間能用PLC程序任意調節(jié),并且根據不同的情況用程序可以實現(xiàn)多種控制方式,使生料均化的效果達到最佳。 2)3臺空氣分配器的價格共計12.5萬元,而20只電磁閥PLC的價格只有7.4萬元。因此,1997年5月該廠決定采用PLC+電磁閥控制方案,并且修改設計、安裝和調試全部由本廠自行承擔。1997年12月生料均化控制系統(tǒng)投入運行一年多,控制設備運行正常,均化效果良好。  混合室?guī)炀? 混合室均化庫主要包括:貯存庫、混合室、庫頂分配器、庫內充氣系統(tǒng)和庫側卸料裝置。其中庫內充氣系統(tǒng)包括:環(huán)形區(qū)卸料充氣槽、混合室攪拌充氣槽和隧道區(qū)輸送充氣槽,生料送入庫頂分配器,呈流態(tài)化均勻地分配到輸送斜槽中,通過斜槽下料口進入貯存庫形成料層。庫底環(huán)形充氣槽分成四個區(qū),由一臺羅茨風機供氣,每個區(qū)包括三個充氣單元。通過電磁閥控制單個充氣單元的循環(huán)充氣,分塊切割料層,卸入混合室。混合室充氣槽也分成四個區(qū),由兩臺羅茨風機供氣。通過電磁閥控制,以“一區(qū)強其余三區(qū)弱”的方式,輪換充氣攪拌混合室內的生料,形成一定高度的流態(tài)化料層,后由隧道區(qū)上卸料口卸出。  PLC控制電氣設計 2.1 硬件設計 為滿足PLC控制與S7400PCS系統(tǒng)連接及設備控制要求,設置了S1自動/手動/機旁切換和S2中控/本控切換。當S1在自動位置時,S2可以選擇中控計算機起/停操作或本控PLC控制柜起/停操作。當S1在手動位置時,可由PLC控制柜上的按鈕來控制設備開、停。當S1在機旁位置時,可由機旁控制箱上的按鈕來控制設備開、停。選用日本三菱公司的PLC:FX2-32MR擴展FX-16EYR,對4臺羅茨風機和20只電磁閥進行控制。 2.2 軟件設計 程序設計采用梯形圖語言。根據控制原理,設計程序共分4個部分:1)外環(huán)區(qū)順序控制部分。2)內環(huán)區(qū)“一強三弱”控制部分。3)羅茨風機電機控制部分。4)方式切換和報警檢測部分。為適應生產工況的變化,程序中外環(huán)區(qū)和內環(huán)區(qū)的時間可隨時調整并有記憶功能。均化周期為55min。  PLC系統(tǒng)安裝調試 電氣設計完畢后即可進行控制系統(tǒng)的安裝、調試。在控制柜中安裝PLC,連接電源及輸入、輸出控制線路,輸入控制程序進行調試。首先采用模擬調試,即切斷輸出電源,模擬各種輸入信號并對所有輸出信號進行測試,看程序各個部分的功能是否符合控制過程的要求,用以考察PLC控制程序的完整性和可靠性。然后接通PLC輸出電源,進行空載聯(lián)動試車,最后進行帶負荷聯(lián)動試車。  使用效果 1)PLC控制系統(tǒng)投入運行后,出庫生料CaCO3的指標全部合格,均化系數可達5.4,系統(tǒng)運行良好。 2)每個充氣單元的時間參數可根據工藝的要求隨時調整,且有記憶功能,不受停電等因素的影響,修改參數方便。對各區(qū)充氣單元充氣順序的不同組合,可實現(xiàn)多種均化方式。還可控制環(huán)形區(qū)的卸料速度,使混合室內的生料充分攪拌保持一定的流態(tài)化料層高度,保證了均化效果,滿足了工藝的要求。 3)控制功能軟件化簡化了控制設備,節(jié)省了設備投資,同時增加了設備運行的可靠性,減少了維修工作量,降低了維修費用。系統(tǒng)切換靈活,操作簡單方便,崗位工人容易掌握。



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