The present utility model belongs to the technical field of automatic bottle rejecting devices, and specifically relates to an automatic bottle rejecting device for an injection blow molding machine, comprising a conveyor belt, a light source, sample bottles, a backlight plate, a linear motor and a push rod. The light source is arranged on one side of the conveyor belt, the sample bottles are placed on the conveyor belt, the backlight plate is arranged on the other side of the conveyor belt and is located in the optical path direction of the light source, the linear motor is arranged on one side of the conveyor belt, and the push rod is connected to a mover seat of the linear motor. The present utility model projects the sample bottles onto the backlight plate through the light source, judges whether there are black spots on the sample bottles through the bright and dark areas of the backlight plate. If there are black spots, the bottles are defective, the linear motor drives the push rod to push the defective bottles into the defective bottle collection basket, while the sample bottles without black spots enter the qualified bottle collection basket along the conveyor belt. The device is time-saving and labor-saving, reduces the labor intensity of workers, improves the work efficiency, and greatly increases the yield rate of the sample bottles.

Country Code: CN

Application Number: CN202121926889.8