爐門框架采用(yong)槽鋼制作，側板和底板采用(yong)Q235鋼板焊接，結構牢(lao)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)制(zhi)系(xi)統(tong)(tong)：主控(kong)系(xi)統(tong)(tong)控(kong)制(zhi)柜(ju)(ju)采用國際流(liu)(liu)行立式組合柜(ju)(ju)。控(kong)制(zhi)柜(ju)(ju)外表噴涂電腦色(se)或淺駝色(se)。電控(kong)面板上裝有電流(liu)(liu)表、電壓表、溫(wen)度控(kong)制(zhi)儀(yi)及控(kong)制(zhi)開關等(deng)。

溫(wen)度控(kong)(kong)(kong)制(zhi)(zhi)主回(hui)路采(cai)用(yong)可控(kong)(kong)(kong)硅過零調功(gong)(gong)觸(chu)發，可控(kong)(kong)(kong)硅采(cai)用(yong)風冷形式，設有過載、過熱(re)及過流保護(hu)等功(gong)(gong)能(neng)(neng)。溫(wen)度控(kong)(kong)(kong)制(zhi)(zhi)儀(yi)表選用(yong)先進(jin)的上海國龍智(zhi)能(neng)(neng)高精度數顯PID自整定型儀(yi)表，控(kong)(kong)(kong)制(zhi)(zhi)精度±1℃。該溫(wen)度控(kong)(kong)(kong)制(zhi)(zhi)配有熱(re)電偶修正功(gong)(gong)能(neng)(neng)、功(gong)(gong)率限制(zhi)(zhi)功(gong)(gong)能(neng)(neng)及超溫(wen)報警功(gong)(gong)能(neng)(neng)。當(dang)爐門打開時自動切斷加熱(re)主電路，實現聯(lian)鎖保護(hu)。

爐溫(wen)(wen)記(ji)錄采用南(nan)通達(da)華(hua)記(ji)錄儀，對升溫(wen)(wen)及保溫(wen)(wen)時間過程實(shi)時打印曲線、記(ji)錄溫(wen)(wen)度，同時對加熱主回路實(shi)現監(jian)控作(zuo)用，有效地(di)監(jian)視整(zheng)個生產工藝(yi)。