爐門(men)框(kuang)架(jia)采用槽(cao)鋼(gang)制作，側板(ban)和底板(ban)采用Q235鋼(gang)板(ban)焊接，結構牢固可(ke)靠，不易變形和翹曲，整(zheng)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(zhi)系統：主控(kong)(kong)系統控(kong)(kong)制(zhi)柜采用(yong)國(guo)際流(liu)行立式(shi)組合柜。控(kong)(kong)制(zhi)柜外表噴涂(tu)電(dian)腦色或淺駝(tuo)色。電(dian)控(kong)(kong)面板上(shang)裝(zhuang)有電(dian)流(liu)表、電(dian)壓(ya)表、溫(wen)度(du)控(kong)(kong)制(zhi)儀及控(kong)(kong)制(zhi)開關等。

溫(wen)度控(kong)(kong)制主回路采用(yong)可(ke)控(kong)(kong)硅(gui)過零調功(gong)(gong)觸發(fa)，可(ke)控(kong)(kong)硅(gui)采用(yong)風冷形式，設有過載、過熱及(ji)過流保護等功(gong)(gong)能(neng)(neng)。溫(wen)度控(kong)(kong)制儀表(biao)選用(yong)先進的上(shang)海國龍(long)智能(neng)(neng)高精度數顯PID自整定型(xing)儀表(biao)，控(kong)(kong)制精度±1℃。該溫(wen)度控(kong)(kong)制配(pei)有熱電(dian)偶(ou)修正功(gong)(gong)能(neng)(neng)、功(gong)(gong)率限制功(gong)(gong)能(neng)(neng)及(ji)超溫(wen)報警功(gong)(gong)能(neng)(neng)。當(dang)爐門打開時自動(dong)切(qie)斷加熱主電(dian)路，實現聯鎖(suo)保護。

爐溫記錄采用南通達華記錄儀，對(dui)升溫及保(bao)溫時(shi)間(jian)過(guo)程實時(shi)打印曲線(xian)、記錄溫度，同時(shi)對(dui)加熱主回路(lu)實現監控(kong)作用，有效地監視整個(ge)生(sheng)產工藝(yi)。