Wind and color sorting method to prevent tea leaves to be fermented from being damaged

Abstract

The invention discloses a winnowing and color sorting method capable of preventing tea leaf damage. The method has the advantages that tea leaf flow sorting can be adjusted accurately by the joint action of a wind-driven feeding wheel and a first wind distribution plate capable of controlling wind quantity in dividedly, and the wind force of a second wind distribution plate can be adjusted according actual sorting needs so as to adjust the angle of the wind bending downwards during secondary winnowing; a tea leaf winnowing and color sorting machine uses a control unit for controlling the whole sorting process to allow the tea leaf flow inside the machine to be even and smooth, error discharging caused by sorting overload during winnowing can be prevented, and tea leaves with excellent quality enters a fermentation process.

Description

technical field [0001] The invention relates to a tea selection method, which belongs to the field of tea selection and separation. Background technique [0002] Black tea is a fully fermented tea with a certain bitterness and astringency, sweet and mellow. "Fermentation" refers to the oxidation and hydrolysis process that tea undergoes when certain endogenous enzymes come into contact with a substrate, such as the mechanical disruption of cells by leaf maceration. During this process, the colorless catechins in the leaves are transformed into a complex mixture of yellow and orange to dark brown polyphenols. And good black tea is not only pure in taste, but also its appearance and impurity rate should have higher level requirements, which puts forward higher requirements for the sorting of tea leaves before entering the fermentation process. In the field of tea sorting, winnowing is to use the difference in weight, volume, shape and windshield size of young tea leaves and ...

AI Technical Summary

Problems solved by technology

Existing tea sorting machines use a large number of feeding vibrating tables or thrust impellers in the wind. The high-frequency vibration of the feeding vibrating table can easily damage the leaves of the tea leaves, and the thrust impeller is to throw the tea flow into the air by rotating during feeding. The air selection area, and the stage of feeding and applying thrust is easy to damage the tea leaves

However, since modern tea selection is mostly mechanized, the contradiction between mechanized sorting and tea loss reduction cannot be resolved for a long time.

[0003] On the other hand, the accuracy of winnowing is also what those skilled in the art want to improve for a long time. Because the wind power of winnowing is not easy to control, there are often problems such as wrong discharge of fine tea or residual impurities, which will lead to sorting failure and affect the quality of tea.

[0004] On the other hand, in the modern tea sorting process, multiple winnowing and color sorting are often integrated, and the sorting capacity and sorting flow in each stage are not easy to coordinate

Images