竹内挖掘机回转支承/大齿圈/大转盘TB140-TB150-TB175-TB180凯斯挖掘机回转支承/大齿圈/大转盘CX55-CX75-CX210-CX240-CX360加藤挖掘机回转支承/大齿圈/大转盘)