A kind of winnowing and color sorting method of tea leaves to be fermented

Abstract

The invention discloses a winnowing and color sorting method of tea leaves to be fermented. According to the method, a throw path is preset for a pneumatic feed wheel; adjustment of a first air distribution plate allowing for stage air control is utilized; accordingly, sorting of tea leaf flows are precisely adjusted. In addition, wind force upon a second air distribution plate can be adjusted according to actual sorting needs, and accordingly the angle of down-curved air in a secondary winnowing stage is adjusted. A control unit for controlling the whole sorting process is used in a tea leaf winnowing and color sorting machine, so that tea leaf flows in the tea leaf winnowing and color sorting machine are even and smooth and misarrangement caused by sorting overload in the winnowing stage is prevented.

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

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