爐(lu)門框架采用槽鋼制作，側板(ban)和底板(ban)采用Q235鋼板(ban)焊(han)接(jie)，結構牢(lao)固可靠，不(bu)易變形和翹曲，整體強(qiang)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)制系統(tong)：主控(kong)系統(tong)控(kong)制柜采(cai)用國際流行(xing)立式組合柜。控(kong)制柜外表(biao)噴(pen)涂(tu)電(dian)腦色或淺駝色。電(dian)控(kong)面板上裝有電(dian)流表(biao)、電(dian)壓表(biao)、溫度控(kong)制儀及控(kong)制開(kai)關(guan)等。

溫(wen)(wen)(wen)度(du)(du)控(kong)(kong)(kong)制(zhi)主(zhu)回路采(cai)用(yong)可控(kong)(kong)(kong)硅過零調功(gong)觸發，可控(kong)(kong)(kong)硅采(cai)用(yong)風冷形式，設有過載、過熱及過流保護等(deng)功(gong)能(neng)(neng)。溫(wen)(wen)(wen)度(du)(du)控(kong)(kong)(kong)制(zhi)儀表選用(yong)先進(jin)的上海國龍智能(neng)(neng)高精度(du)(du)數顯PID自(zi)整(zheng)定型儀表，控(kong)(kong)(kong)制(zhi)精度(du)(du)±1℃。該溫(wen)(wen)(wen)度(du)(du)控(kong)(kong)(kong)制(zhi)配有熱電偶修(xiu)正功(gong)能(neng)(neng)、功(gong)率限(xian)制(zhi)功(gong)能(neng)(neng)及超溫(wen)(wen)(wen)報(bao)警功(gong)能(neng)(neng)。當爐(lu)門打開時自(zi)動切斷(duan)加熱主(zhu)電路，實現聯鎖保護。

爐溫記錄(lu)采(cai)用(yong)南(nan)通達華記錄(lu)儀，對升溫及保溫時(shi)間過程實(shi)時(shi)打印曲線、記錄(lu)溫度，同(tong)時(shi)對加熱主回路實(shi)現監控作(zuo)用(yong)，有效地監視整個生產工藝。