爐(lu)門框(kuang)架采(cai)(cai)用槽鋼制(zhi)作，側板和底板采(cai)(cai)用Q235鋼板焊接，結(jie)構牢(lao)固可靠，不(bu)易變形(xing)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(kong)制(zhi)系統(tong)(tong)：主控(kong)系統(tong)(tong)控(kong)制(zhi)柜(ju)采用國際流行立式組合(he)柜(ju)。控(kong)制(zhi)柜(ju)外表(biao)噴涂電(dian)腦色(se)或淺駝(tuo)色(se)。電(dian)控(kong)面板(ban)上裝有(you)電(dian)流表(biao)、電(dian)壓表(biao)、溫(wen)度控(kong)制(zhi)儀及控(kong)制(zhi)開(kai)關等。

溫度(du)控(kong)制(zhi)(zhi)主回(hui)路采(cai)(cai)用可(ke)控(kong)硅過零(ling)調功(gong)(gong)(gong)(gong)觸發(fa)，可(ke)控(kong)硅采(cai)(cai)用風冷形(xing)式，設有過載、過熱(re)及過流(liu)保護(hu)等功(gong)(gong)(gong)(gong)能(neng)。溫度(du)控(kong)制(zhi)(zhi)儀(yi)表選(xuan)用先進(jin)的上海國(guo)龍智(zhi)能(neng)高(gao)精度(du)數(shu)顯(xian)PID自整(zheng)定型(xing)儀(yi)表，控(kong)制(zhi)(zhi)精度(du)±1℃。該(gai)溫度(du)控(kong)制(zhi)(zhi)配有熱(re)電偶(ou)修正功(gong)(gong)(gong)(gong)能(neng)、功(gong)(gong)(gong)(gong)率限制(zhi)(zhi)功(gong)(gong)(gong)(gong)能(neng)及超溫報警功(gong)(gong)(gong)(gong)能(neng)。當爐門打開時自動切斷加熱(re)主電路，實現聯鎖保護(hu)。

爐溫(wen)(wen)記錄(lu)(lu)采(cai)用南(nan)通達華記錄(lu)(lu)儀，對升溫(wen)(wen)及(ji)保溫(wen)(wen)時(shi)(shi)間(jian)過程實(shi)時(shi)(shi)打(da)印曲線、記錄(lu)(lu)溫(wen)(wen)度，同時(shi)(shi)對加熱主回路實(shi)現監控作用，有(you)效地(di)監視整(zheng)個生(sheng)產工(gong)藝。