爐門框架采(cai)用(yong)槽鋼制作，側板和底板采(cai)用(yong)Q235鋼板焊接，結構(gou)牢固可靠，不易變形和翹(qiao)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)制(zhi)系統(tong)：主(zhu)控(kong)系統(tong)控(kong)制(zhi)柜采用國際流行(xing)立式(shi)組合柜。控(kong)制(zhi)柜外表(biao)噴涂電(dian)腦色或淺(qian)駝(tuo)色。電(dian)控(kong)面板上裝有電(dian)流表(biao)、電(dian)壓表(biao)、溫度(du)控(kong)制(zhi)儀及控(kong)制(zhi)開關等。

溫(wen)(wen)度(du)控(kong)制(zhi)(zhi)主(zhu)回(hui)路采(cai)用可控(kong)硅(gui)過(guo)(guo)零(ling)調功(gong)(gong)(gong)觸發，可控(kong)硅(gui)采(cai)用風冷(leng)形(xing)式，設有過(guo)(guo)載、過(guo)(guo)熱(re)及過(guo)(guo)流保護等功(gong)(gong)(gong)能。溫(wen)(wen)度(du)控(kong)制(zhi)(zhi)儀表選用先進(jin)的上海國龍(long)智能高精度(du)數(shu)顯PID自(zi)整定(ding)型(xing)儀表，控(kong)制(zhi)(zhi)精度(du)±1℃。該溫(wen)(wen)度(du)控(kong)制(zhi)(zhi)配(pei)有熱(re)電(dian)偶修正功(gong)(gong)(gong)能、功(gong)(gong)(gong)率限制(zhi)(zhi)功(gong)(gong)(gong)能及超溫(wen)(wen)報警(jing)功(gong)(gong)(gong)能。當爐門打開時自(zi)動切斷加熱(re)主(zhu)電(dian)路，實現聯鎖保護。

爐溫(wen)(wen)(wen)記錄采用南通達華記錄儀，對(dui)升溫(wen)(wen)(wen)及(ji)保(bao)溫(wen)(wen)(wen)時間過(guo)程(cheng)實時打印曲線、記錄溫(wen)(wen)(wen)度，同(tong)時對(dui)加(jia)熱主(zhu)回路實現監(jian)控作用，有效地監(jian)視整個(ge)生(sheng)產工藝。