爐(lu)門框架采(cai)用槽鋼制作，側(ce)板和底板采(cai)用Q235鋼板焊接，結(jie)構牢固可靠(kao)，不易變形和翹曲，整(zheng)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(zhi)系(xi)統：主控(kong)(kong)系(xi)統控(kong)(kong)制(zhi)柜(ju)(ju)采(cai)用(yong)國(guo)際流(liu)行立(li)式組合柜(ju)(ju)。控(kong)(kong)制(zhi)柜(ju)(ju)外表噴涂(tu)電(dian)(dian)(dian)腦色(se)或淺駝色(se)。電(dian)(dian)(dian)控(kong)(kong)面板上裝(zhuang)有(you)電(dian)(dian)(dian)流(liu)表、電(dian)(dian)(dian)壓表、溫度控(kong)(kong)制(zhi)儀及(ji)控(kong)(kong)制(zhi)開關等。

溫(wen)(wen)度控制主回路采用可控硅過(guo)零(ling)調功(gong)(gong)(gong)觸發(fa)，可控硅采用風(feng)冷(leng)形式，設有(you)過(guo)載(zai)、過(guo)熱及過(guo)流保護等功(gong)(gong)(gong)能(neng)。溫(wen)(wen)度控制儀表選(xuan)用先進的上海國龍(long)智能(neng)高(gao)精度數(shu)顯(xian)PID自整定(ding)型儀表，控制精度±1℃。該溫(wen)(wen)度控制配(pei)有(you)熱電偶修正功(gong)(gong)(gong)能(neng)、功(gong)(gong)(gong)率限制功(gong)(gong)(gong)能(neng)及超溫(wen)(wen)報警功(gong)(gong)(gong)能(neng)。當爐門打(da)開時自動切斷加熱主電路，實現聯鎖保護。

爐溫(wen)記(ji)錄采用南通達華記(ji)錄儀(yi)，對(dui)升(sheng)溫(wen)及保溫(wen)時間過程實時打(da)印曲(qu)線、記(ji)錄溫(wen)度(du)，同時對(dui)加熱主回路實現監控(kong)作(zuo)用，有效地監視(shi)整個(ge)生(sheng)產工藝。