CONVEYING AND SCREENING DEVICE, SPIRAL PUSHING TYPE PEANUT KERNEL GRADING MACHINE AND METHOD THEREOF

A conveying and screening device (III), a spiral pushing type peanut kernel grader, and a method thereof. The conveying and screening device (III) comprises a conveying and screening drum, which comprises at least two stages of drums having equal diameters; the drum of each stage is defined by a plurality of round tubes (III-01) uniformly, and round tube gaps of the drums of different stages are different; the drum proximate to a feed port is the first-stage drum and has the smallest round tube gap, and the round tube gap of the latter-stage drum is increased stage by stage compared with the round tube gap of the former-stage drum. By using the conveying and screening device, the spiral pushing type peanut kernel grader, and the method thereof for screening peanut kernels, a conveying speed and grading efficiency are improved, a uniform particle size of the graded peanut kernels is guaranteed, and the probability of screen blockage is low.