回轉窯筒(tong)(tong)體是(shi)基本的組(zu)成部分之一，但(dan)是(shi)回轉窯(yao)筒(tong)(tong)體在高溫的烘烤下很容易被燒毀。為了保(bao)護筒(tong)(tong)體我們(men)會在回轉窯(yao)筒(tong)(tong)體內(nei)鑲砌耐火磚，但(dan)回轉窯(yao)筒(tong)(tong)體還(huan)是(shi)很可能產生徑(jing)向(xiang)變(bian)形(xing)，那么筒(tong)(tong)體徑(jing)向(xiang)變(bian)形(xing)究竟是(shi)什么引起的呢(ni)？下面紅星給(gei)大家分析一下。

回轉窯筒(tong)(tong)(tong)(tong)(tong)體靠幾(ji)個(ge)輪帶(dai)支承(cheng)在(zai)(zai)托輪上。由于筒(tong)(tong)(tong)(tong)(tong)體在(zai)(zai)自重(zhong)、耐火磚、物料等重(zhong)量作(zuo)用下，兩個(ge)輪帶(dai)之間的(de)(de)(de)(de)筒(tong)(tong)(tong)(tong)(tong)體上會產生軸(zhou)向彎曲變(bian)形和橫截面上的(de)(de)(de)(de)徑(jing)向變(bian)形。近(jin)(jin)(jin)二、三十年(nian)來，采用筒(tong)(tong)(tong)(tong)(tong)體徑(jing)向變(bian)形儀，對(dui)筒(tong)(tong)(tong)(tong)(tong)體進行了大量的(de)(de)(de)(de)實際測(ce)定及理論(lun)上的(de)(de)(de)(de)探討，認為筒(tong)(tong)(tong)(tong)(tong)體除了應具(ju)備足夠的(de)(de)(de)(de)強度(du)和軸(zhou)向剛(gang)度(du)外，更重(zhong)要的(de)(de)(de)(de)是(shi)應該具(ju)有(you)足夠的(de)(de)(de)(de)徑(jing)向剛(gang)度(du)。在(zai)(zai)臨近(jin)(jin)(jin)輪帶(dai)處的(de)(de)(de)(de)筒(tong)(tong)(tong)(tong)(tong)體上，測(ce)得(de)的(de)(de)(de)(de)筒(tong)(tong)(tong)(tong)(tong)體徑(jing)向變(bian)形的(de)(de)(de)(de)示意圖(tu)。筒(tong)(tong)(tong)(tong)(tong)體上每一(yi)點(dian)的(de)(de)(de)(de)曲率半徑(jing)，在(zai)(zai)一(yi)次(ci)回轉中，總是(shi)在(zai)(zai)變(bian)化著，它的(de)(de)(de)(de)軌(gui)跡近(jin)(jin)(jin)似于一(yi)個(ge)平放著的(de)(de)(de)(de)橢圓。

從測(ce)得的筒體(ti)徑向(xiang)(xiang)(xiang)變形(xing)的示意圖中得知(zhi)：橫截面上(shang)曲(qu)率半(ban)徑的變化，說明了有(you)(you)環(huan)(huan)向(xiang)(xiang)(xiang)彎(wan)(wan)曲(qu)應力的存(cun)在(zai)，我們曾在(zai)某窯輪帶(dai)下的筒體(ti)上(shang)，測(ce)得環(huan)(huan)向(xiang)(xiang)(xiang)彎(wan)(wan)曲(qu)應力比軸(zhou)向(xiang)(xiang)(xiang)彎(wan)(wan)曲(qu)應力數值大；另外筒體(ti)徑向(xiang)(xiang)(xiang)變形(xing)具有(you)(you)正負不(bu)斷變化和多次反復(fu)的特征，一次回轉中就有(you)(you)六次交變。

對于屬于脆性材料的耐(nai)火(huo)磚而言，承(cheng)受交變(bian)(bian)應(ying)力(li)是(shi)容易損壞(huai)和脫落(luo)的。這種變(bian)(bian)形(xing)主要(yao)是(shi)由于輪(lun)帶(dai)處存在(zai)著巨大(da)的支(zhi)反力(li)所引起(qi)的，因此筒體變(bian)(bian)形(xing)總(zong)是(shi)發生在(zai)輪(lun)帶(dai)附(fu)近，并向輪(lun)帶(dai)兩側(ce)伸(shen)展并遞減(jian)，在(zai)兩個輪(lun)帶(dai)中間部分，變(bian)(bian)形(xing)較(jiao)小。