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(han)接，結構牢固可靠，不易變形和翹曲(qu)，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)(kong)(kong)(kong)制系統：主控(kong)(kong)(kong)(kong)系統控(kong)(kong)(kong)(kong)制柜(ju)采(cai)用國際(ji)流(liu)行立式組(zu)合(he)柜(ju)。控(kong)(kong)(kong)(kong)制柜(ju)外表(biao)噴涂電(dian)(dian)腦色(se)或淺(qian)駝色(se)。電(dian)(dian)控(kong)(kong)(kong)(kong)面板(ban)上裝有(you)電(dian)(dian)流(liu)表(biao)、電(dian)(dian)壓(ya)表(biao)、溫度控(kong)(kong)(kong)(kong)制儀及控(kong)(kong)(kong)(kong)制開關等。

溫(wen)(wen)度(du)(du)控(kong)制(zhi)(zhi)主(zhu)回路(lu)(lu)采用可(ke)控(kong)硅過零調(diao)功觸(chu)發，可(ke)控(kong)硅采用風冷形式，設有(you)過載、過熱(re)(re)及(ji)(ji)過流保護等功能(neng)。溫(wen)(wen)度(du)(du)控(kong)制(zhi)(zhi)儀表選用先(xian)進(jin)的上海國(guo)龍智(zhi)能(neng)高精(jing)度(du)(du)數(shu)顯PID自整定型儀表，控(kong)制(zhi)(zhi)精(jing)度(du)(du)±1℃。該(gai)溫(wen)(wen)度(du)(du)控(kong)制(zhi)(zhi)配(pei)有(you)熱(re)(re)電偶修正功能(neng)、功率(lv)限(xian)制(zhi)(zhi)功能(neng)及(ji)(ji)超溫(wen)(wen)報警功能(neng)。當爐門打(da)開(kai)時自動切斷加熱(re)(re)主(zhu)電路(lu)(lu)，實現聯鎖(suo)保護。

爐溫記錄(lu)采用(yong)南(nan)通達(da)華記錄(lu)儀，對(dui)升溫及保(bao)溫時(shi)間過程實時(shi)打印曲線、記錄(lu)溫度，同時(shi)對(dui)加熱主回路實現(xian)監(jian)控(kong)作用(yong)，有效地監(jian)視整個生產工(gong)藝(yi)。