The present invention relates to the technical field of tea preparation and screening, and discloses a screening device for preparing rose
black tea and a screening process thereof, comprising a base, a screen cylinder, a cleaning cylinder and a driving
assembly; the screen cylinder and the cleaning cylinder are installed side by side on the base, a negative pressure feeding
pipe is provided on the top of the screen cylinder, a
powder collecting box is built-in at the bottom, and a screening motor and a reversing motor are respectively installed on the side walls; a blower is provided on the top of the cleaning cylinder, and a debris collecting bucket and a debris collecting box are provided at the bottom in sequence; a fixed shaft which can be raised and lowered is provided on the driving
assembly, and the present invention simulates the shaking of an artificial screen plate, which is characterized by
low frequency and
high amplitude, so that the raw materials can jump and rotate forward in a parabolic manner on the filter plate, and this
screening method has less
impact force on the petals than the violent
impact and friction of a high-frequency vibrating screen, and can greatly reduce the risk of breakage caused by repeated collisions, and at the same time simulates artificial shaking to keep the material in a loose
jumping state, and the sliding friction
contact time between the petals and between the petals and the screen is short, and it is not easy to be broken by squeezing or scraping.