爐(lu)門框架采用槽鋼制作，側板(ban)和底板(ban)采用Q235鋼板(ban)焊接，結構牢固可靠(kao)，不易變形和翹曲，整體強(qiang)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。

控制系(xi)統：主控系(xi)統控制柜采用國際流行立(li)式組合柜。控制柜外(wai)表噴涂電(dian)(dian)(dian)腦色或(huo)淺駝色。電(dian)(dian)(dian)控面板上裝有電(dian)(dian)(dian)流表、電(dian)(dian)(dian)壓表、溫度控制儀及(ji)控制開(kai)關等。

溫度(du)(du)控(kong)制(zhi)主回路(lu)(lu)采(cai)(cai)用可(ke)控(kong)硅(gui)過(guo)零調功(gong)(gong)(gong)觸發，可(ke)控(kong)硅(gui)采(cai)(cai)用風冷形式，設有過(guo)載、過(guo)熱(re)及過(guo)流保(bao)護等功(gong)(gong)(gong)能。溫度(du)(du)控(kong)制(zhi)儀表選用先進的(de)上海國龍(long)智能高(gao)精度(du)(du)數(shu)顯(xian)PID自整定型儀表，控(kong)制(zhi)精度(du)(du)±1℃。該溫度(du)(du)控(kong)制(zhi)配有熱(re)電偶修(xiu)正功(gong)(gong)(gong)能、功(gong)(gong)(gong)率限制(zhi)功(gong)(gong)(gong)能及超溫報警功(gong)(gong)(gong)能。當爐門(men)打開時自動切斷加熱(re)主電路(lu)(lu)，實(shi)現聯鎖保(bao)護。

爐溫記(ji)錄(lu)采用南通達華記(ji)錄(lu)儀，對升(sheng)溫及(ji)保溫時間過程實時打印曲線、記(ji)錄(lu)溫度，同時對加熱主回(hui)路實現監控作(zuo)用，有效(xiao)地監視整個(ge)生產工(gong)藝。