爐(lu)門框架采用槽(cao)鋼制作，側板(ban)和(he)底板(ban)采用Q235鋼板(ban)焊接，結構牢固可靠，不易(yi)變形和(he)翹(qiao)曲，整體(ti)強度(du)好(hao)。

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)(ju)采用國際流行(xing)立式組合(he)柜(ju)(ju)。控(kong)(kong)(kong)(kong)制柜(ju)(ju)外表(biao)噴(pen)涂電腦色或(huo)淺駝色。電控(kong)(kong)(kong)(kong)面板上裝有(you)電流表(biao)、電壓表(biao)、溫度控(kong)(kong)(kong)(kong)制儀(yi)及(ji)控(kong)(kong)(kong)(kong)制開關等(deng)。

溫度(du)控(kong)制主回路采用可控(kong)硅(gui)過(guo)(guo)(guo)零調功(gong)(gong)觸(chu)發，可控(kong)硅(gui)采用風冷形式，設有過(guo)(guo)(guo)載、過(guo)(guo)(guo)熱及過(guo)(guo)(guo)流保護等功(gong)(gong)能。溫度(du)控(kong)制儀(yi)(yi)表選用先進的上海國龍(long)智能高精(jing)度(du)數顯(xian)PID自整定型儀(yi)(yi)表，控(kong)制精(jing)度(du)±1℃。該(gai)溫度(du)控(kong)制配有熱電偶修正(zheng)功(gong)(gong)能、功(gong)(gong)率(lv)限制功(gong)(gong)能及超溫報警功(gong)(gong)能。當(dang)爐門打開時自動切(qie)斷加熱主電路，實(shi)現聯鎖保護。

爐溫(wen)(wen)(wen)記錄(lu)采用(yong)南(nan)通達華(hua)記錄(lu)儀，對升溫(wen)(wen)(wen)及保溫(wen)(wen)(wen)時間(jian)過程實(shi)時打印(yin)曲線、記錄(lu)溫(wen)(wen)(wen)度，同時對加熱主回(hui)路實(shi)現監控作(zuo)用(yong)，有(you)效地監視整(zheng)個生產工藝。