Fecha de publicación: 22/08/2023 Fuente: WIPO "processing tomato" A grading screening device for tomato seed processing relates to the technical field of seed screening and comprises a hopper, a stirring mechanism is arranged in the hopper, two groups of symmetrical mounting support frames are fixedly connected to the lower end of the hopper, and a secondary separation box is transversely fixed between the two groups of mounting support frames; two symmetrical suspension mounting plates are fixedly connected to the side end face of the lower portion of the hopper, the primary screening box is fixed between the two suspension mounting plates in the transverse direction, an airflow screening assembly is arranged in the primary screening box, and a vibration sorting assembly is arranged in the secondary separation box. A vertical transfer communicating pipe is fixedly connected into an opening in the lower end of the hopper, the lower end of the transfer communicating pipe extends into the primary screening box, and a flow dividing buffering mechanism is arranged in the transfer communicating pipe. The problems that when tomato seeds are classified and screened through a device in the traditional technology, the tomato seeds are prone to being bonded into blocks, screening and separation are not thorough, and the classification and screening effect is poor due to the single screening mode are solved.