| 摘要 |
PURPOSE:To surely clean polishing grains by connection-forming a selecting device for separating pinball and polishing grains at an upper discharge port and freely selecting a circulation pipe for the direct return to a polishing grain feeding port and a cleaning circulation pipe for introducing the polishing grain into a polishing grain cleaning device and returning the dirty polishing grains after cleaning and by circulating the polishing grains. CONSTITUTION:A selecting device 10 is set in close to a discharge port 9 formed above a lift-feeding cylinder 1, and the mixture which is raised in the lift-feeding cylinder and discharged from the discharge port 9 is separated into pinballs (a) and polishing grains (b) by the selecting device 10. Further, a current transformation mechanism 18 for converting the flow-down direction of the polishing grains (b) supplied into a circulation pipe 15 and a cleaning circulation pipe 17 is installed, and the polishing grains (b) which flow-down from a polishing grain receiving plate 12 are introduced into a polishing grain cleaning part 16 through the free selective conversion to the cleaning circulation pipe 17 from the circulation pipe 15 by the current transformation mechanism 18. Therefore, the polishing grains can always be cleaned uniformly, free from the wasteful consumption. |
