The pin bead mill adopts a unique large-area tubular mesh centrifugal separator, with accurate separation and smooth discharge, which solves the problems of slow discharge speed and grinding medium blockage. Ultra fine grinding media can be used. Pin (nail) grinding system and high-power driver can realize the high efficiency and reliable performance of wet grinding. Non clogging patented dynamic screening system is equipped with high yield and narrow grinding medium size. These needle ball mills are suitable for paints, coatings, inks and other products.