爐門(men)框架采用槽鋼制作，側板和底(di)板采用Q235鋼板焊接(jie)，結構牢固可靠，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)(kong)制(zhi)系統：主控(kong)(kong)(kong)系統控(kong)(kong)(kong)制(zhi)柜采用(yong)國際流行立式組(zu)合柜。控(kong)(kong)(kong)制(zhi)柜外表噴(pen)涂電腦色(se)或(huo)淺駝色(se)。電控(kong)(kong)(kong)面板上裝有電流表、電壓表、溫度控(kong)(kong)(kong)制(zhi)儀及控(kong)(kong)(kong)制(zhi)開關等。

溫(wen)度控(kong)制主(zhu)回路采(cai)(cai)用可(ke)控(kong)硅過零調功(gong)(gong)觸發，可(ke)控(kong)硅采(cai)(cai)用風冷形式(shi)，設有過載、過熱(re)及過流保護等(deng)功(gong)(gong)能(neng)(neng)。溫(wen)度控(kong)制儀表選用先進的上海(hai)國(guo)龍智能(neng)(neng)高精(jing)度數顯(xian)PID自整定型儀表，控(kong)制精(jing)度±1℃。該溫(wen)度控(kong)制配有熱(re)電偶修正(zheng)功(gong)(gong)能(neng)(neng)、功(gong)(gong)率限(xian)制功(gong)(gong)能(neng)(neng)及超(chao)溫(wen)報警功(gong)(gong)能(neng)(neng)。當爐門打開時(shi)自動(dong)切斷加熱(re)主(zhu)電路，實現聯(lian)鎖保護。

爐溫(wen)記(ji)錄(lu)(lu)采(cai)用(yong)南通達華記(ji)錄(lu)(lu)儀，對升溫(wen)及(ji)保(bao)溫(wen)時(shi)(shi)間過程實時(shi)(shi)打印(yin)曲線、記(ji)錄(lu)(lu)溫(wen)度(du)，同(tong)時(shi)(shi)對加熱主(zhu)回(hui)路(lu)實現監控作用(yong)，有效地監視(shi)整個生(sheng)產工藝。