Research and design of a semi-automatic tea leaves sorting system

Zhou, Hong, (2018) Research and design of a semi-automatic tea leaves sorting system. 2018. (Submitted)

PDF (Final report) - Accepted Version

Abstract or Summary

The purpose of this project is to design an automatic tea leaves sorting system that separates these leaves according to their shape mechanically. The designed system would be integrated into a machinery that would be manufactured and sent to Zealong factory. This system could save the company more than $250,000 a year, where they usually hire overseas labour to hand-pick the tea leaves from New Zealand only tea plantation situated in Hamilton. As a first step, a trimming tractor would cut the tea bushes at 750mm from the ground. Then the machinery would separate the trimmed samples into classes from 1 to 5, where the number represents the number of leaves per branch. From the morphological study, it was concluded that the higher the number of leaves, the higher the weight and diameter. From five experiments that used a centrifugal fan, only one that was successful in separating Class 3 leaves from the rest. This was experiment 5 with 70% where 67% of class 3 drops between 0mm and 400mm in x-axis, and between 200mm and 800mm in y-axis, 20% of same class drops between 350mm and 650mm in x-axis and between 150mm and 700mm in y-axis, and the rest which is 13% finishes the track as it was too flat to be blown by air. Experiment 1, 2 and 3 were a complete failure with 0% efficiency. This is because the system is to sort out a product of same density by air, which usually more efficient to sort out materials with different densities. However, each of these experiments could be re-set up and tested at different angles. Experiment 4 should to be re-designed and make the fan closer to the conveyor’s end, preferably at 70mm, and re-tested. Experiment 6 aimed to sort out class 1

Item Type:Supervise fellow researcher or student work
Keywords that describe the item:tea, tea leaves, engineering, Zealong, Tea production
Subjects:T Technology > T Technology (General)
Divisions:Schools > Centre for Engineering and Industrial Design
ID Code:6681
Deposited By:
Deposited On:18 Dec 2018 01:17
Last Modified:18 Dec 2018 01:19

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