爐門框架(jia)采(cai)用槽鋼制作，側(ce)板(ban)和底(di)板(ban)采(cai)用Q235鋼板(ban)焊接，結構(gou)牢(lao)固可靠，不易(yi)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)制(zhi)系統(tong)：主控(kong)系統(tong)控(kong)制(zhi)柜(ju)采用國際(ji)流(liu)(liu)行立式組合(he)柜(ju)。控(kong)制(zhi)柜(ju)外表(biao)(biao)噴涂電(dian)腦色(se)或淺駝色(se)。電(dian)控(kong)面板上裝有電(dian)流(liu)(liu)表(biao)(biao)、電(dian)壓表(biao)(biao)、溫度控(kong)制(zhi)儀及控(kong)制(zhi)開關等(deng)。

溫(wen)度(du)(du)控(kong)(kong)制(zhi)主(zhu)回(hui)路(lu)采用可(ke)控(kong)(kong)硅過(guo)零調功(gong)(gong)(gong)觸(chu)發，可(ke)控(kong)(kong)硅采用風冷形式，設有過(guo)載(zai)、過(guo)熱(re)及過(guo)流保(bao)護等功(gong)(gong)(gong)能(neng)(neng)。溫(wen)度(du)(du)控(kong)(kong)制(zhi)儀表(biao)選(xuan)用先進的上海國龍(long)智能(neng)(neng)高精度(du)(du)數顯PID自整定(ding)型儀表(biao)，控(kong)(kong)制(zhi)精度(du)(du)±1℃。該溫(wen)度(du)(du)控(kong)(kong)制(zhi)配有熱(re)電(dian)偶(ou)修正功(gong)(gong)(gong)能(neng)(neng)、功(gong)(gong)(gong)率限制(zhi)功(gong)(gong)(gong)能(neng)(neng)及超溫(wen)報警功(gong)(gong)(gong)能(neng)(neng)。當爐門(men)打開時自動(dong)切(qie)斷加熱(re)主(zhu)電(dian)路(lu)，實現(xian)聯(lian)鎖(suo)保(bao)護。

爐溫(wen)記錄(lu)采用南通達(da)華記錄(lu)儀(yi)，對升溫(wen)及保溫(wen)時間(jian)過程實時打印曲線、記錄(lu)溫(wen)度，同時對加熱(re)主回路實現監控作用，有效地監視整(zheng)個(ge)生(sheng)產(chan)工(gong)藝。