roller bucket 消能戽 ; 消力戽
slotted roller bucket 槽齿式戽
bucket line guide roller 斗链滚筒
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Geometry model of roller bit's sphere tooth, wedgy tooth and bucket shape tooth were established;
建立了牙轮钻头的球形齿、楔形齿和勺形齿三维空间的几何模型；
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