可退式捞矛是修井打捞作业的主要工具之一。它的质量直接影响着修井打捞作业的经济效益。因此,制造质量高、性能可靠的零件是十分重要的。可退式捞矛由矛杆、卡瓦、释放环和引鞋等四个零件组成(图1)。其主要动作的原理是:具有通长开口且外径略大于落鱼内径的 Retractable spear is one of the main tools for workover salvage. Its quality directly affects the economic benefits of workover and salvage operations. Therefore, the manufacture of high quality, reliable parts is very important. Retractable spear by the spear, slip, release ring and shoes and other four parts (Figure 1). The principle of its main action is: with a long opening and the outer diameter slightly larger than the inner diameter of the fish