我局七二三地质队在煤田地质中钻探，由于地层松软，常易造成孔壁坍塌，钻孔超径。当钻杆折断在超径孔段中，往往贴靠孔壁的一边，用捞锥及其它打捞工具下去打捞，不容易找到孔内钻杆断头，造成事故处理时间长，甚至报废管材和钻探工作量，使钻孔达不到预期目的。这种事故钻探工作者认为是“老大难”问题。经过无产阶级文化大革命战斗洗礼的该队职工，遵照伟大领袖毛主席关于“在生产斗争和科学实验范围内，人类总是不断发展的，自然界也总是不断发展的，永远不会停止在一个水平上。因此，人类总得不断地总结经验，有所发现，有所发明，有所创造，有所前进”的教导，积极着手解决这一困难问题。在省局及队的领导和大力支持下，倾听了老工人的意见设计了永磁打捞器。永磁打捞器中的永久磁 Our Bureau 723 geological team drilled in coalfield geology. Due to the loose stratum, the wall of the hole often collapsed and the borehole exceeded its diameter. When the drill pipe is broken in the over-diameter hole section, often abutting one side of the hole wall, fishing with the fishing gear and other fishing tools, it is not easy to find the broken drill pipe hole, resulting in long processing time of the accident or even scrapped the pipe and drilling The workload, so that drilling can not achieve the desired purpose. Drilling workers of this accident consider it a “dilemma.” After the proletarian Cultural Revolution, the team members and staff, as well as the great leader Chairman Mao, stated that “mankind always develops continuously within the scope of the struggle for production and scientific experiments. Nature will always continue to develop and will never stop at a certain level Therefore, mankind always has to sum up experiences, discoveries made, inventions made, advances made and advances, ”and actively tackles this difficult issue. In the provincial bureau and the team’s leadership and strong support, listening to the advice of the old workers designed permanent magnetic salvage. Permanent magnet in permanent fishing