爐門框架采用槽鋼制作(zuo)，側板(ban)和(he)底板(ban)采用Q235鋼板(ban)焊接，結構牢固可靠，不易變形和(he)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)(kong)(kong)制(zhi)(zhi)系統(tong)：主控(kong)(kong)(kong)(kong)系統(tong)控(kong)(kong)(kong)(kong)制(zhi)(zhi)柜(ju)采用國際流(liu)行立式組合柜(ju)。控(kong)(kong)(kong)(kong)制(zhi)(zhi)柜(ju)外表噴(pen)涂電腦色(se)或淺(qian)駝色(se)。電控(kong)(kong)(kong)(kong)面板(ban)上裝(zhuang)有電流(liu)表、電壓(ya)表、溫度控(kong)(kong)(kong)(kong)制(zhi)(zhi)儀及控(kong)(kong)(kong)(kong)制(zhi)(zhi)開(kai)關等。

溫度(du)(du)控制主回路(lu)采用(yong)(yong)可(ke)控硅(gui)過零(ling)調功(gong)(gong)觸(chu)發，可(ke)控硅(gui)采用(yong)(yong)風冷形(xing)式，設(she)有(you)過載、過熱(re)及過流保護等功(gong)(gong)能。溫度(du)(du)控制儀表(biao)選(xuan)用(yong)(yong)先(xian)進的上海國龍智能高(gao)精度(du)(du)數顯PID自整定型儀表(biao)，控制精度(du)(du)±1℃。該溫度(du)(du)控制配有(you)熱(re)電偶修正(zheng)功(gong)(gong)能、功(gong)(gong)率限制功(gong)(gong)能及超(chao)溫報警功(gong)(gong)能。當爐門打開時自動切斷加(jia)熱(re)主電路(lu)，實現聯鎖保護。

爐(lu)溫(wen)記錄采用(yong)南(nan)通達華記錄儀，對升溫(wen)及保溫(wen)時(shi)間過程實時(shi)打印曲線(xian)、記錄溫(wen)度，同時(shi)對加熱(re)主回路實現監控作(zuo)用(yong)，有效地監視整個(ge)生產工藝。