爐(lu)門框架采(cai)用槽鋼(gang)制作，側板和底板采(cai)用Q235鋼(gang)板焊接，結構牢固可靠(kao)，不易變形和翹曲，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)(kong)制(zhi)系統：主(zhu)控(kong)(kong)系統控(kong)(kong)制(zhi)柜采用國際(ji)流行立式組合柜。控(kong)(kong)制(zhi)柜外表(biao)噴涂電(dian)(dian)腦色或淺駝色。電(dian)(dian)控(kong)(kong)面(mian)板上裝有電(dian)(dian)流表(biao)、電(dian)(dian)壓表(biao)、溫度控(kong)(kong)制(zhi)儀及控(kong)(kong)制(zhi)開關(guan)等。

溫(wen)度(du)控(kong)(kong)制(zhi)(zhi)(zhi)主回(hui)路(lu)(lu)采用(yong)(yong)可(ke)控(kong)(kong)硅(gui)過零調功(gong)(gong)觸發，可(ke)控(kong)(kong)硅(gui)采用(yong)(yong)風冷形式，設(she)有(you)過載、過熱及過流(liu)保(bao)護等(deng)功(gong)(gong)能(neng)。溫(wen)度(du)控(kong)(kong)制(zhi)(zhi)(zhi)儀表選用(yong)(yong)先進的上(shang)海國龍智能(neng)高精度(du)數(shu)顯PID自整(zheng)定型儀表，控(kong)(kong)制(zhi)(zhi)(zhi)精度(du)±1℃。該溫(wen)度(du)控(kong)(kong)制(zhi)(zhi)(zhi)配有(you)熱電偶修正功(gong)(gong)能(neng)、功(gong)(gong)率限(xian)制(zhi)(zhi)(zhi)功(gong)(gong)能(neng)及超溫(wen)報警功(gong)(gong)能(neng)。當爐門打開時自動切斷加熱主電路(lu)(lu)，實現(xian)聯(lian)鎖保(bao)護。

爐溫記錄(lu)采(cai)用南(nan)通達華(hua)記錄(lu)儀，對升溫及保溫時間過程實時打(da)印曲線、記錄(lu)溫度(du)，同時對加熱(re)主回路實現監(jian)控作用，有效地(di)監(jian)視整個生產工藝。