爐門框架采用(yong)槽(cao)鋼制(zhi)作，側(ce)板和底板采用(yong)Q235鋼板焊接(jie)，結構牢固可(ke)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)制(zhi)(zhi)系統(tong)：主(zhu)控(kong)(kong)系統(tong)控(kong)(kong)制(zhi)(zhi)柜采用(yong)國際流行立(li)式組合柜。控(kong)(kong)制(zhi)(zhi)柜外表噴涂電(dian)腦色或淺駝色。電(dian)控(kong)(kong)面板(ban)上(shang)裝有電(dian)流表、電(dian)壓表、溫度控(kong)(kong)制(zhi)(zhi)儀及控(kong)(kong)制(zhi)(zhi)開關等(deng)。

溫度(du)控(kong)(kong)(kong)(kong)制主回路采用(yong)可控(kong)(kong)(kong)(kong)硅(gui)過(guo)零調功(gong)觸(chu)發，可控(kong)(kong)(kong)(kong)硅(gui)采用(yong)風冷形式，設(she)有過(guo)載、過(guo)熱(re)及過(guo)流(liu)保護等功(gong)能。溫度(du)控(kong)(kong)(kong)(kong)制儀表選用(yong)先進(jin)的上海國(guo)龍智能高精(jing)度(du)數顯PID自整定型儀表，控(kong)(kong)(kong)(kong)制精(jing)度(du)±1℃。該溫度(du)控(kong)(kong)(kong)(kong)制配有熱(re)電偶修正功(gong)能、功(gong)率限制功(gong)能及超溫報警功(gong)能。當爐門打開(kai)時自動切斷(duan)加熱(re)主電路，實現(xian)聯鎖保護。

爐溫記(ji)錄(lu)采(cai)用南通達(da)華記(ji)錄(lu)儀(yi)，對升溫及(ji)保溫時間(jian)過程實時打印曲線、記(ji)錄(lu)溫度(du)，同(tong)時對加熱(re)主回(hui)路實現監控作用，有效地監視整個生產工藝。