爐門框架采(cai)用槽鋼制作(zuo)，側板和(he)底(di)板采(cai)用Q235鋼板焊接(jie)，結構牢固可(ke)靠，不易變形和(he)翹曲，整體強(qiang)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)制系統(tong)(tong)：主控(kong)(kong)系統(tong)(tong)控(kong)(kong)制柜采用國際流(liu)行立式組合柜。控(kong)(kong)制柜外表(biao)噴(pen)涂(tu)電(dian)腦色(se)或淺駝色(se)。電(dian)控(kong)(kong)面板上裝(zhuang)有電(dian)流(liu)表(biao)、電(dian)壓表(biao)、溫度控(kong)(kong)制儀及控(kong)(kong)制開關(guan)等。

溫度(du)(du)控(kong)(kong)制(zhi)主(zhu)回路(lu)采(cai)用可控(kong)(kong)硅過零調功(gong)(gong)觸(chu)發，可控(kong)(kong)硅采(cai)用風冷形式，設有過載、過熱(re)及過流保(bao)護(hu)(hu)等功(gong)(gong)能(neng)(neng)(neng)。溫度(du)(du)控(kong)(kong)制(zhi)儀(yi)表(biao)選用先進的上(shang)海國龍智能(neng)(neng)(neng)高精(jing)度(du)(du)數(shu)顯PID自整(zheng)定型(xing)儀(yi)表(biao)，控(kong)(kong)制(zhi)精(jing)度(du)(du)±1℃。該溫度(du)(du)控(kong)(kong)制(zhi)配有熱(re)電偶修(xiu)正功(gong)(gong)能(neng)(neng)(neng)、功(gong)(gong)率限制(zhi)功(gong)(gong)能(neng)(neng)(neng)及超溫報警功(gong)(gong)能(neng)(neng)(neng)。當爐門打開時自動切斷加(jia)熱(re)主(zhu)電路(lu)，實現聯鎖(suo)保(bao)護(hu)(hu)。

爐溫(wen)(wen)記錄采用南通(tong)達華記錄儀，對(dui)(dui)升溫(wen)(wen)及(ji)保溫(wen)(wen)時(shi)間過程實時(shi)打印(yin)曲(qu)線、記錄溫(wen)(wen)度，同時(shi)對(dui)(dui)加(jia)熱主(zhu)回(hui)路實現監控作用，有效地監視整個生產工藝(yi)。