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井式爐

某鋼廠4臺老式井式滲碳爐的改造案例


摘  要

本文介紹針對現有的井式滲碳爐的弊端,利用工控機、PLC、智能儀表及網絡對原控制系統進行了自動控制的改造,使得工藝穩定性好,控制精度高,提高了工件的滲碳質量。生產現場工藝監控效果良好,操作方便。

 

原系統簡介

 

鋼管廠有四臺老式井式滲碳爐。它們的爐溫及碳勢控制系統都一樣。溫度控制采用四川省儀表廠生產的自動平衡記錄儀(型號為×WG一101)組成的位控系統(既開關量控制)。它的爐溫控制系統工作原理如下所述:當轉換開關置于手動檔時,人工操作中間繼電器吸合、分斷來帶動加熱接觸器吸合:分斷,使得電熱絲通電、斷電,使爐子達到升溫、降溫的目的。如轉換開關置于自動檔時,則由自動平衡記錄調節儀自動控制接觸器閉合、分斷,使爐子達到升溫、降溫的目的。碳勢控制則完全靠操作人員的經驗目測手控,對碳勢沒有任何自動控制。不但碳勢精度不高,而且對工人的操作技術水平及經驗要求較高。所以造成工件質量不穩定,廢品率高。


 

改造后系統控制方案

 

改造后的控制系統以機修井式加熱爐S7-300 PLC作為主站,通過Profibus—DP總線與智能儀表及變頻器作等從站進行通訊,同時S7—300 PLC經由工業以太網并入廠內原有的工業控制以太網,與廠內中控室的上位工業控制計算機進行數據交換。實現對整個井式加熱爐進行實時的遠程監控。由于智能儀表大部分只提供基于Modbus協議的485串口通訊口歷法與主站PLC通過Profibus協議直接通訊,因而采用了外置的485一DP網橋轉換器,PLC負責爐蓋升降、風機等整個系統的常規邏輯控制。智能儀表采用碳勢控制儀和溫控儀分別對爐里的碳勢、溫度進行實時測量和控制

 

 

詳細改造方案可來電咨詢027-82638412


 

 

輝達工控微信公眾號致力于打造一個高價值的工控交流分享平臺

歡迎大家掃描下方微信加入我們分享交流行列!


 


 

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