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(shí)在引鞋和導(dǎo)錐的作用下滑牙塊能夠順利進(jìn)入魚腔并依靠自重下滑一级老女人特黄A片，沿導(dǎo)軌外伸直至其齒面與魚腔內(nèi)壁接觸啊啊啊网站免费观看；隨后上提鉆柱，矛桿上的導(dǎo)軌斜面迫使滑牙塊咬緊被打撈油管內(nèi)壁91丨九色丨18，當(dāng)油管嚴(yán)重偏磨使一對(duì)滑牙塊卡在磨穿位置時(shí)欧美亚洲中文激情，另一對(duì)能有效卡在未磨損部位，同時(shí)外筒限制了油管外脹變形亚洲另类网站。