1问题的提出金堆城铝业公司百花岭选矿厂的PX1200ll800旋回破碎机是选矿生产的关胜设备。1994年5月于解体拆换破碎动推部件和横梁部件时发现，主轴悬挂部位的螺纹和闽槽均严重损坏。经检测，螺纹从什62处向下数的第4、5、6国螺纹牙损坏约占工作高度的213左右（见日1、2），谁槽 1 The question put forward Jinduicheng aluminum company Baihua Ridge beneficiation plant PX1200ll800 gyratory crusher is beneficiation production of Kwan-winning equipment. In May 1994, during the disassembly and replacement of broken movable parts and beam components, it was found that the threads of the spindle suspension parts and the Min-trough were severely damaged. After testing, the number of thread down from 62 to 4,5,6 number of thread damage accounts for about 213 of the working height (see day 1,2), who slot