爐(lu)門(men)框(kuang)架(jia)采用槽鋼(gang)制作，側(ce)板(ban)和底板(ban)采用Q235鋼(gang)板(ban)焊接(jie)，結構(gou)牢固可靠，不(bu)易變形和翹曲，整(zheng)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)制(zhi)(zhi)系(xi)統：主控(kong)(kong)系(xi)統控(kong)(kong)制(zhi)(zhi)柜(ju)(ju)采用(yong)國(guo)際流(liu)行立式組合柜(ju)(ju)。控(kong)(kong)制(zhi)(zhi)柜(ju)(ju)外表噴涂電(dian)(dian)腦色或淺駝(tuo)色。電(dian)(dian)控(kong)(kong)面板(ban)上裝(zhuang)有電(dian)(dian)流(liu)表、電(dian)(dian)壓(ya)表、溫度控(kong)(kong)制(zhi)(zhi)儀(yi)及控(kong)(kong)制(zhi)(zhi)開關等。

溫(wen)(wen)度控(kong)制(zhi)主(zhu)回路采用可控(kong)硅過零調功(gong)(gong)觸發(fa)，可控(kong)硅采用風(feng)冷形式，設有(you)過載、過熱及過流(liu)保(bao)護(hu)(hu)等功(gong)(gong)能(neng)(neng)。溫(wen)(wen)度控(kong)制(zhi)儀表選用先進的上海國(guo)龍智能(neng)(neng)高精度數顯PID自整定型儀表，控(kong)制(zhi)精度±1℃。該(gai)溫(wen)(wen)度控(kong)制(zhi)配(pei)有(you)熱電偶修正(zheng)功(gong)(gong)能(neng)(neng)、功(gong)(gong)率(lv)限制(zhi)功(gong)(gong)能(neng)(neng)及超溫(wen)(wen)報警功(gong)(gong)能(neng)(neng)。當(dang)爐門打開時自動切斷加(jia)熱主(zhu)電路，實現(xian)聯鎖(suo)保(bao)護(hu)(hu)。

爐溫(wen)記錄采用(yong)南通(tong)達華記錄儀，對升溫(wen)及保溫(wen)時間(jian)過(guo)程實(shi)時打(da)印曲線、記錄溫(wen)度(du)，同時對加熱主回路實(shi)現監控作用(yong)，有效地(di)監視整個生產工(gong)藝。