爐門(men)框(kuang)架采用槽鋼制作，側板(ban)和底板(ban)采用Q235鋼板(ban)焊接，結(jie)構(gou)牢固可靠，不(bu)易變形(xing)和翹曲，整體強度(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)制(zhi)(zhi)系統(tong)：主控(kong)(kong)系統(tong)控(kong)(kong)制(zhi)(zhi)柜采用國際流行(xing)立式組合柜。控(kong)(kong)制(zhi)(zhi)柜外表(biao)噴涂電腦色(se)或淺(qian)駝色(se)。電控(kong)(kong)面板上裝有電流表(biao)、電壓表(biao)、溫(wen)度控(kong)(kong)制(zhi)(zhi)儀及控(kong)(kong)制(zhi)(zhi)開關等。

溫度控(kong)(kong)制主回路采用(yong)可控(kong)(kong)硅過零調功(gong)(gong)(gong)觸發，可控(kong)(kong)硅采用(yong)風冷形(xing)式，設(she)有過載、過熱(re)及(ji)過流保(bao)護等功(gong)(gong)(gong)能。溫度控(kong)(kong)制儀表選用(yong)先進的上海國龍智能高精度數顯PID自(zi)整定(ding)型(xing)儀表，控(kong)(kong)制精度±1℃。該溫度控(kong)(kong)制配有熱(re)電(dian)偶修正功(gong)(gong)(gong)能、功(gong)(gong)(gong)率限制功(gong)(gong)(gong)能及(ji)超溫報警功(gong)(gong)(gong)能。當爐門打開時自(zi)動切斷加熱(re)主電(dian)路，實現聯(lian)鎖保(bao)護。

爐溫(wen)記錄采用南通達華(hua)記錄儀，對升溫(wen)及保溫(wen)時(shi)間過程(cheng)實時(shi)打印曲線、記錄溫(wen)度，同時(shi)對加熱主回(hui)路實現監(jian)控作(zuo)用，有效地監(jian)視整個生產工藝。