针对一些复杂井大修作业中出现的“落鱼”不清、“鱼顶”不明 ,现有方法难以打捞的大直径“落鱼” ,以及“落鱼”中夹有硬质材料落物等特殊情况 ,经过大量的实验和实践 ,开发研制了系列空心磨鞋 ,基本解决了这些问题。介绍了空心磨鞋的结构原理、使用范围及现场应用效果 Aiming at the problems such as unclear “falling fish”, “big fish” unknown in some complicated well overhaul operations, large diameter “falling fish” that is hard to be salvaged by existing methods, and special objects such as falling fish with hard materials The situation, after a large number of experiments and practices, developed a series of hollow grinding shoes, the basic solution to these problems. Introduced the structural principle of hollow grinding shoes, the scope of application and field application effects