Automatic feeding and discharging device of internal grinding machine

An automatic feeding and discharging device of an internal grinding machine comprises a feeding sliding rail, a discharging assembly, a material taking assembly and a discharging sliding rail, the feeding sliding rail is a falling type sliding rail, and the lower end of the feeding sliding rail is located on a feeding groove in the discharging assembly; the discharging assembly comprises a feeding groove, a vertically-arranged stacking groove is formed in a discharging opening of the feeding groove, and a machining station is arranged below the stacking groove. The material taking assembly comprises a telescopic material taking plate, a first abutting piece is arranged on the telescopic material taking plate, the first abutting piece is located below the machining station and used for blocking workpieces, and when the telescopic material taking plate stretches out in the direction of the machining station, the workpieces fall into the inner side of the first abutting piece and enter the discharging position.