A kind of tea winnowing and color sorting machine

Abstract

The invention discloses a tea leaf winnowing and color-sorting machine capable of preventing to-be-fermented tea leaves from being damaged. The tea leaf winnowing and color-sorting machine uses a pneumatic feed wheel which applies air force to push a tea leaf flow to enter a winnowing chamber rather than applying thrust to up-throw tea leaves; the pneumatic feed wheel rotates at a low speed so that damages to the tea leaves are minimized from the feed wheel. The tea leaf winnowing and color-sorting machine further uses a first air distribution plate and a second air distribution plate capable of realizing segmented air-flow control, and air force of the air distribution plates can be regulated according to actual sorting needs. In addition, due to a control unit which is used for controlling the overall sorting process, the tea leaf flow inside the tea leaf winnowing and color-sorting machine is uniform in rate, and error discharging due to overload sorting during the winnowing stage is avoided. By the tea leaf winnowing and color-sorting machine, only high-quality tea leaves are fed to a fermentation process.

Description

technical field [0001] The invention relates to a tea sorting machine, which belongs to the field of tea sorting 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 lig...

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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