爐門框架采用槽鋼制作，側板(ban)(ban)和底板(ban)(ban)采用Q235鋼板(ban)(ban)焊接，結構牢(lao)固可靠，不易變形和翹曲，整體強度好。

爐門升降為電動葫蘆驅動。箱式預熱爐廠家在爐門上有一斷路裝置，該裝置與輪軸連鎖，當爐門打開時即切斷加熱元件電源以保證操作人員安全。爐門上裝有調節式密封機構，有效使爐門密封。在爐頂上有一熱電偶孔，在使用時將熱電偶插入爐膛通過電爐控制柜來控制爐膛工作溫度。

控制(zhi)(zhi)系統(tong)：主控系統(tong)控制(zhi)(zhi)柜采用國際(ji)流行(xing)立式(shi)組合柜。控制(zhi)(zhi)柜外表噴涂(tu)電腦色(se)或淺駝色(se)。電控面板上裝有電流表、電壓表、溫(wen)度控制(zhi)(zhi)儀及(ji)控制(zhi)(zhi)開關等。

溫度(du)控(kong)(kong)制(zhi)主回路采用可控(kong)(kong)硅過零調功(gong)(gong)(gong)觸發，可控(kong)(kong)硅采用風冷形式，設有過載(zai)、過熱(re)及過流保(bao)護等功(gong)(gong)(gong)能(neng)。溫度(du)控(kong)(kong)制(zhi)儀表選用先進的上海國龍智能(neng)高精度(du)數顯PID自整定型儀表，控(kong)(kong)制(zhi)精度(du)±1℃。該溫度(du)控(kong)(kong)制(zhi)配有熱(re)電偶修(xiu)正功(gong)(gong)(gong)能(neng)、功(gong)(gong)(gong)率(lv)限制(zhi)功(gong)(gong)(gong)能(neng)及超溫報警(jing)功(gong)(gong)(gong)能(neng)。當爐門打開時自動(dong)切斷加(jia)熱(re)主電路，實(shi)現(xian)聯(lian)鎖保(bao)護。

爐溫記錄(lu)采用南通達華(hua)記錄(lu)儀，對升溫及(ji)保溫時(shi)間過(guo)程實時(shi)打印(yin)曲線、記錄(lu)溫度，同時(shi)對加熱主回路實現(xian)監(jian)(jian)控作用，有效地監(jian)(jian)視整(zheng)個生產工藝。