爐門框(kuang)架采用槽(cao)鋼制(zhi)作，側板和底板采用Q235鋼板焊接，結構牢固可(ke)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)制系(xi)統(tong)：主控(kong)(kong)系(xi)統(tong)控(kong)(kong)制柜采用國(guo)際流(liu)行立(li)式組合柜。控(kong)(kong)制柜外表(biao)噴涂電腦(nao)色或淺駝色。電控(kong)(kong)面(mian)板上裝有(you)電流(liu)表(biao)、電壓表(biao)、溫度控(kong)(kong)制儀(yi)及控(kong)(kong)制開關等。

溫(wen)(wen)度(du)控(kong)(kong)(kong)制(zhi)(zhi)(zhi)(zhi)主(zhu)回路(lu)采用可(ke)控(kong)(kong)(kong)硅過零調(diao)功(gong)觸發，可(ke)控(kong)(kong)(kong)硅采用風冷形式(shi)，設有過載、過熱及(ji)過流(liu)保(bao)護(hu)等功(gong)能(neng)(neng)。溫(wen)(wen)度(du)控(kong)(kong)(kong)制(zhi)(zhi)(zhi)(zhi)儀(yi)表(biao)選用先進(jin)的(de)上(shang)海國龍智能(neng)(neng)高精(jing)度(du)數顯(xian)PID自整定(ding)型儀(yi)表(biao)，控(kong)(kong)(kong)制(zhi)(zhi)(zhi)(zhi)精(jing)度(du)±1℃。該溫(wen)(wen)度(du)控(kong)(kong)(kong)制(zhi)(zhi)(zhi)(zhi)配有熱電偶(ou)修正功(gong)能(neng)(neng)、功(gong)率(lv)限制(zhi)(zhi)(zhi)(zhi)功(gong)能(neng)(neng)及(ji)超溫(wen)(wen)報警功(gong)能(neng)(neng)。當爐門打開(kai)時自動(dong)切斷加熱主(zhu)電路(lu)，實現聯鎖(suo)保(bao)護(hu)。

爐(lu)溫(wen)(wen)記錄采用(yong)南通達(da)華記錄儀，對(dui)(dui)升(sheng)溫(wen)(wen)及保溫(wen)(wen)時(shi)間過程實時(shi)打印曲線、記錄溫(wen)(wen)度，同(tong)時(shi)對(dui)(dui)加(jia)熱(re)主回路實現監控作用(yong)，有效(xiao)地(di)監視(shi)整(zheng)個生產工藝。