爐(lu)門框(kuang)架采用槽(cao)鋼(gang)制作，側板(ban)(ban)和(he)底板(ban)(ban)采用Q235鋼(gang)板(ban)(ban)焊接，結(jie)構(gou)牢(lao)固(gu)可靠，不易變(bian)形(xing)和(he)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)(kong)(kong)制系統(tong)：主控(kong)(kong)(kong)系統(tong)控(kong)(kong)(kong)制柜(ju)采(cai)用國際流行立式(shi)組合柜(ju)。控(kong)(kong)(kong)制柜(ju)外(wai)表(biao)噴涂電(dian)腦色或(huo)淺駝色。電(dian)控(kong)(kong)(kong)面板上(shang)裝有(you)電(dian)流表(biao)、電(dian)壓表(biao)、溫度控(kong)(kong)(kong)制儀及(ji)控(kong)(kong)(kong)制開關等。

溫度控(kong)制(zhi)主(zhu)回路采(cai)用(yong)可控(kong)硅過(guo)零調功(gong)(gong)觸發，可控(kong)硅采(cai)用(yong)風(feng)冷形式，設(she)有過(guo)載、過(guo)熱(re)及過(guo)流保護等功(gong)(gong)能(neng)。溫度控(kong)制(zhi)儀表選用(yong)先(xian)進(jin)的上海國龍智(zhi)能(neng)高精度數顯PID自整定型儀表，控(kong)制(zhi)精度±1℃。該溫度控(kong)制(zhi)配有熱(re)電(dian)偶(ou)修(xiu)正功(gong)(gong)能(neng)、功(gong)(gong)率限制(zhi)功(gong)(gong)能(neng)及超溫報警功(gong)(gong)能(neng)。當爐門打開時自動(dong)切(qie)斷(duan)加熱(re)主(zhu)電(dian)路，實現(xian)聯(lian)鎖(suo)保護。

爐溫(wen)記錄采用(yong)南通達華記錄儀(yi)，對升溫(wen)及(ji)保(bao)溫(wen)時(shi)間過程實時(shi)打(da)印曲線、記錄溫(wen)度，同(tong)時(shi)對加熱主回路(lu)實現監控作用(yong)，有效地監視整(zheng)個生產(chan)工藝。