Paint grinding device for graded cyclic grinding

The coating grinding device comprises a grinding cylinder, a feeding port is formed in the upper surface of the grinding cylinder, a primary grinding box is fixedly connected to the upper surface of the grinding cylinder, a rotating motor is fixedly connected to the bottom surface of the grinding cylinder, and a secondary grinding box is fixedly connected to the upper surface of the rotating motor. The output end of the rotating motor is fixedly connected with a rotating shaft through a speed reducer, a bearing is fixedly inlaid in the inner bottom wall of the grinding cylinder, the top end ofthe rotating shaft penetrates through the bearing and the feeding port in sequence and extends into the primary grinding box, and grinding rollers arranged at equal intervals are fixedly connected tothe outer surface of the rotating shaft; and the top end of the rotating shaft is fixedly connected with a grinding disc. According to the coating grinding device with the graded cyclic grinding function, grinding is conducte