Many breakdown reasons, such as design, mount and overhaul of cylindrical steel ball pulverizer, which cause the inlet-and-outlet spiral bushing to come off.

• 摘要探讨圆筒式钢球磨煤机因设计、安装、检修等诸多原因，造成磨煤机进出口螺旋套脱出的现象，并根据设备的现状提出了改进的措施。