爐門框架采(cai)(cai)用槽鋼(gang)制作，側(ce)板和底板采(cai)(cai)用Q235鋼(gang)板焊接，結構牢固可靠，不易變形和翹(qiao)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(kong)制(zhi)(zhi)系統(tong)(tong)：主控(kong)系統(tong)(tong)控(kong)制(zhi)(zhi)柜采用國際流行立式組(zu)合(he)柜。控(kong)制(zhi)(zhi)柜外表(biao)噴涂電(dian)腦色(se)或淺駝色(se)。電(dian)控(kong)面(mian)板上裝有電(dian)流表(biao)、電(dian)壓表(biao)、溫度控(kong)制(zhi)(zhi)儀及控(kong)制(zhi)(zhi)開(kai)關等。

溫(wen)度控(kong)(kong)(kong)制(zhi)(zhi)主回路采用可控(kong)(kong)(kong)硅過(guo)零調功(gong)(gong)觸發，可控(kong)(kong)(kong)硅采用風冷形式，設有(you)過(guo)載、過(guo)熱(re)及過(guo)流保護等功(gong)(gong)能。溫(wen)度控(kong)(kong)(kong)制(zhi)(zhi)儀(yi)表選用先進(jin)的上海國龍智能高(gao)精(jing)度數顯PID自(zi)整定型(xing)儀(yi)表，控(kong)(kong)(kong)制(zhi)(zhi)精(jing)度±1℃。該溫(wen)度控(kong)(kong)(kong)制(zhi)(zhi)配有(you)熱(re)電偶修正(zheng)功(gong)(gong)能、功(gong)(gong)率(lv)限(xian)制(zhi)(zhi)功(gong)(gong)能及超溫(wen)報警(jing)功(gong)(gong)能。當爐門打開時自(zi)動切斷加熱(re)主電路，實現聯鎖保護。

爐溫記錄(lu)采用(yong)南通(tong)達華記錄(lu)儀，對升溫及保溫時間(jian)過程實(shi)時打印曲線、記錄(lu)溫度，同時對加熱主回(hui)路(lu)實(shi)現(xian)監控(kong)作用(yong)，有效地監視整個生產工藝。