爐(lu)門框架采用槽鋼制作，側板和底(di)板采用Q235鋼板焊接，結構牢(lao)固可靠，不易變形和翹(qiao)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)制(zhi)(zhi)系(xi)統(tong)：主控(kong)系(xi)統(tong)控(kong)制(zhi)(zhi)柜采用國際(ji)流(liu)行立(li)式組合柜。控(kong)制(zhi)(zhi)柜外(wai)表噴涂電(dian)腦色或淺駝色。電(dian)控(kong)面板上裝有電(dian)流(liu)表、電(dian)壓表、溫度控(kong)制(zhi)(zhi)儀及控(kong)制(zhi)(zhi)開關等。

溫度(du)(du)控(kong)(kong)(kong)制主回路采(cai)用(yong)可控(kong)(kong)(kong)硅(gui)過零調功(gong)(gong)觸發(fa)，可控(kong)(kong)(kong)硅(gui)采(cai)用(yong)風冷形式，設有過載、過熱及過流保護(hu)(hu)等功(gong)(gong)能。溫度(du)(du)控(kong)(kong)(kong)制儀表選(xuan)用(yong)先進的上海國龍智能高(gao)精(jing)度(du)(du)數(shu)顯PID自整定(ding)型儀表，控(kong)(kong)(kong)制精(jing)度(du)(du)±1℃。該溫度(du)(du)控(kong)(kong)(kong)制配有熱電偶(ou)修正功(gong)(gong)能、功(gong)(gong)率限制功(gong)(gong)能及超溫報警功(gong)(gong)能。當爐門打開時(shi)自動切斷加熱主電路，實(shi)現聯鎖(suo)保護(hu)(hu)。

爐溫(wen)(wen)記(ji)錄采用南通達華記(ji)錄儀，對升(sheng)溫(wen)(wen)及保溫(wen)(wen)時間過程(cheng)實(shi)時打印曲線、記(ji)錄溫(wen)(wen)度(du)，同時對加熱(re)主(zhu)回路實(shi)現監(jian)控作用，有效地監(jian)視整(zheng)個生產工藝(yi)。