爐門框架采(cai)用(yong)槽鋼制作，側(ce)板(ban)和底板(ban)采(cai)用(yong)Q235鋼板(ban)焊接，結構牢固可(ke)靠(kao)，不(bu)易變形和翹曲(qu)，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)(kong)制(zhi)(zhi)(zhi)(zhi)系(xi)統(tong)：主控(kong)(kong)(kong)系(xi)統(tong)控(kong)(kong)(kong)制(zhi)(zhi)(zhi)(zhi)柜(ju)采用國際(ji)流(liu)行立式組合柜(ju)。控(kong)(kong)(kong)制(zhi)(zhi)(zhi)(zhi)柜(ju)外表(biao)噴(pen)涂電(dian)腦(nao)色或淺(qian)駝色。電(dian)控(kong)(kong)(kong)面(mian)板上裝有電(dian)流(liu)表(biao)、電(dian)壓表(biao)、溫度控(kong)(kong)(kong)制(zhi)(zhi)(zhi)(zhi)儀及控(kong)(kong)(kong)制(zhi)(zhi)(zhi)(zhi)開關等(deng)。

溫度(du)控(kong)制(zhi)主回路(lu)采(cai)用可控(kong)硅過零調(diao)功(gong)(gong)(gong)觸發(fa)，可控(kong)硅采(cai)用風冷形式，設有過載、過熱及過流保護等功(gong)(gong)(gong)能(neng)(neng)(neng)。溫度(du)控(kong)制(zhi)儀表(biao)選(xuan)用先(xian)進(jin)的上海國龍智(zhi)能(neng)(neng)(neng)高精度(du)數顯(xian)PID自整定(ding)型儀表(biao)，控(kong)制(zhi)精度(du)±1℃。該溫度(du)控(kong)制(zhi)配有熱電偶修(xiu)正功(gong)(gong)(gong)能(neng)(neng)(neng)、功(gong)(gong)(gong)率限制(zhi)功(gong)(gong)(gong)能(neng)(neng)(neng)及超(chao)溫報警功(gong)(gong)(gong)能(neng)(neng)(neng)。當爐門(men)打(da)開時(shi)自動切斷(duan)加熱主電路(lu)，實現聯鎖(suo)保護。

爐溫(wen)記(ji)錄采用(yong)南通達華記(ji)錄儀，對(dui)升溫(wen)及保溫(wen)時間過程實時打印曲線、記(ji)錄溫(wen)度，同(tong)時對(dui)加熱主回路實現監(jian)控作(zuo)用(yong)，有(you)效地監(jian)視整個生產工(gong)藝。