爐門框架采用槽鋼制(zhi)作(zuo)，側板(ban)和底板(ban)采用Q235鋼板(ban)焊接，結構牢固可(ke)靠，不易(yi)變形和翹曲，整體(ti)強度(du)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)(zhi)系統(tong)(tong)：主控(kong)(kong)(kong)系統(tong)(tong)控(kong)(kong)(kong)制(zhi)(zhi)柜采用(yong)國(guo)際流(liu)行立式組合柜。控(kong)(kong)(kong)制(zhi)(zhi)柜外表噴涂(tu)電腦色或淺駝(tuo)色。電控(kong)(kong)(kong)面板上(shang)裝有電流(liu)表、電壓(ya)表、溫度控(kong)(kong)(kong)制(zhi)(zhi)儀及控(kong)(kong)(kong)制(zhi)(zhi)開關等。

溫(wen)度控(kong)(kong)(kong)制(zhi)(zhi)主回路(lu)采用(yong)可控(kong)(kong)(kong)硅(gui)過零(ling)調功觸(chu)發，可控(kong)(kong)(kong)硅(gui)采用(yong)風冷形式，設有過載、過熱(re)及(ji)過流保護(hu)(hu)等(deng)功能(neng)。溫(wen)度控(kong)(kong)(kong)制(zhi)(zhi)儀表選用(yong)先(xian)進的(de)上海國龍智(zhi)能(neng)高精度數顯PID自整定(ding)型儀表，控(kong)(kong)(kong)制(zhi)(zhi)精度±1℃。該(gai)溫(wen)度控(kong)(kong)(kong)制(zhi)(zhi)配有熱(re)電(dian)(dian)偶修正功能(neng)、功率限制(zhi)(zhi)功能(neng)及(ji)超溫(wen)報警功能(neng)。當(dang)爐(lu)門打開時自動(dong)切斷加(jia)熱(re)主電(dian)(dian)路(lu)，實現(xian)聯鎖保護(hu)(hu)。

爐溫(wen)記(ji)錄(lu)采用南通達華記(ji)錄(lu)儀，對升(sheng)溫(wen)及保溫(wen)時(shi)間過程實時(shi)打印曲線、記(ji)錄(lu)溫(wen)度(du)，同時(shi)對加(jia)熱(re)主回路實現監控作(zuo)用，有效地監視(shi)整個(ge)生產工藝。