耳軸主要用(yong)于(yu)水(shui)平敷設的管(guan)(guan)(guan)道(dao)承重(zhong)。當(dang)水(shui)平管(guan)(guan)(guan)道(dao)拐(guai)彎且其跨度超出(chu)標準要求(qiu)的最(zui)大允(yun)許值時(shi)，可以(yi)借助于(yu)該形(xing)式的支(zhi)(zhi)(zhi)架(jia)(jia)承重(zhong)。該支(zhi)(zhi)(zhi)架(jia)(jia)一般僅(jin)(jin)作承重(zhong)用(yong)，而且僅(jin)(jin)能用(yong)于(yu)允(yun)許支(zhi)(zhi)(zhi)架(jia)(jia)與(yu)(yu)管(guan)(guan)(guan)子直接焊接的情況。當(dang)管(guan)(guan)(guan)道(dao)有保溫時(shi)，它可與(yu)(yu)滑動(dong)管(guan)(guan)(guan)托配合使(shi)用(yong)，此時(shi)的滑動(dong)管(guan)(guan)(guan)托形(xing)式與(yu)(yu)直接支(zhi)(zhi)(zhi)承在(zai)管(guan)(guan)(guan)子上(shang)的形(xing)式相同。

  耳軸的最大(da)長(chang)度視不(bu)同管徑(jing)而定，一般(ban)最大(da)不(bu)應(ying)超過2000mm。

  圖9-30的A型(xing)適用于(yu)向(xiang)下拐彎的情(qing)(qing)況，B型(xing)適用于(yu)向(xiang)上(shang)拐彎的情(qing)(qing)況，C型(xing)適用于(yu)水平拐彎的情(qing)(qing)況。