爐(lu)門框架采(cai)用槽鋼制作，側板(ban)(ban)和底板(ban)(ban)采(cai)用Q235鋼板(ban)(ban)焊接(jie)，結構牢(lao)固可靠(kao)，不易變形和翹曲，整體強度(du)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)制(zhi)系統：主控(kong)(kong)(kong)系統控(kong)(kong)(kong)制(zhi)柜采用國際流(liu)(liu)行立式組(zu)合(he)柜。控(kong)(kong)(kong)制(zhi)柜外表(biao)(biao)噴涂電(dian)腦色(se)或淺駝色(se)。電(dian)控(kong)(kong)(kong)面板(ban)上裝有電(dian)流(liu)(liu)表(biao)(biao)、電(dian)壓表(biao)(biao)、溫(wen)度控(kong)(kong)(kong)制(zhi)儀及控(kong)(kong)(kong)制(zhi)開(kai)關等。

溫(wen)(wen)度(du)(du)控(kong)制(zhi)(zhi)主回路采(cai)(cai)用(yong)可控(kong)硅過零調功(gong)觸發，可控(kong)硅采(cai)(cai)用(yong)風冷形(xing)式(shi)，設(she)有過載(zai)、過熱(re)及過流保(bao)護(hu)等功(gong)能(neng)(neng)。溫(wen)(wen)度(du)(du)控(kong)制(zhi)(zhi)儀(yi)表(biao)選(xuan)用(yong)先(xian)進的(de)上海國龍智能(neng)(neng)高精度(du)(du)數顯PID自整定(ding)型儀(yi)表(biao)，控(kong)制(zhi)(zhi)精度(du)(du)±1℃。該溫(wen)(wen)度(du)(du)控(kong)制(zhi)(zhi)配有熱(re)電(dian)偶修正功(gong)能(neng)(neng)、功(gong)率限制(zhi)(zhi)功(gong)能(neng)(neng)及超溫(wen)(wen)報警功(gong)能(neng)(neng)。當爐門打開時自動切斷加熱(re)主電(dian)路，實現(xian)聯鎖保(bao)護(hu)。

爐溫記錄(lu)采用南通達華記錄(lu)儀，對升溫及保溫時間過(guo)程實(shi)時打(da)印曲(qu)線(xian)、記錄(lu)溫度，同時對加(jia)熱(re)主(zhu)回路(lu)實(shi)現(xian)監(jian)(jian)控作用，有效地監(jian)(jian)視(shi)整個生產工藝(yi)。