In fishing,the sliding cone blocks enter the fish cavity easily acted by a guide shoe and a guide cone,slide downward by its own weight,produce relative displacement to the guide rail slope,and the radial distance between its tooth face and the spear rod increases until it touches the inner wall of the fish cavity; while lifting the drilling string,the guide rail slope on the spear rod forces the sliding cone blocks to bite the inner wall of the tubing fished.

打撈時在引鞋和導錐的作用下滑牙塊能夠順利進入魚腔并依靠自重下滑国产高清一区二区亚，沿導軌外伸直至其齒面與魚腔內(nèi)壁接觸；隨后上提鉆柱www.久久com，矛桿上的導軌斜面迫使滑牙塊咬緊被打撈油管內(nèi)壁，當油管嚴重偏磨使一對滑牙塊卡在磨穿位置時，另一對能有效卡在未磨損部位人人操人人看操女人B，同時外筒限制了油管外脹變形。