Equal-diameter roller type fresh tea grading device and method

Abstract

The invention discloses an equal-diameter roller type fresh tea grading device and method, and belongs to the field of agricultural machinery and equipment. According to the equal-diameter roller type fresh tea grading device, a roller is installed in an inclined manner, each segment of the roller is equal in diameter and length, working parameters can be displayed and adjusted, an air outlet of an air separation fan is located below a feeding belt of a feeding mechanism, and an air outlet of a screen cleaning fan is located above the roller. Due to the equal-diameter structural design, the grading rate and grading speed are improved; and a controller is used for monitoring the working process, so that the grading precision is improved, and the labor intensity is reduced. The air separation fan is used for separating leaves and buds to realize primary grading; the screen cleaning fan is used for blowing the fresh tea leaves blocking the meshes to the roller, so that the screen blockage rate is reduced, and the grading rate and grading speed are increased. The screen mesh can be replaced so as to adapt to different grading requirements. The equal-diameter roller type fresh tea grading device can realize regulation and control of the roller inclination angle, the roller rotation speed and the feeding rate.

Description

technical field [0001] The invention belongs to the field of agricultural machinery equipment, and in particular relates to a method for grading fresh tea leaves. Background technique [0002] The fresh tea leaf classifier is an important tea processing machine in modern agriculture. The fresh tea leaves are classified by the classifying device before processing, which can improve the quality of the finished tea leaves. At present, the working principle of the main fresh tea classifiers at home and abroad is basically the same. They all use sieve holes with different apertures to separate different grades of fresh tea leaves, so as to achieve the purpose of classification. [0003] After retrieving the invention patent 200810059580.6, the drum of the classifier is designed as a cone-shaped cylinder to facilitate the discharge of fresh tea leaves, but the diameter of the feed port of the drum is small, which limits the classification output of the classifier; the sieve apertu...

AI Technical Summary

Problems solved by technology

[0003] After retrieving the invention patent 200810059580.6, the drum of the classifier is designed as a cone-shaped cylinder to facilitate the discharge of fresh tea leaves, but the diameter of the feed port of the drum is small, which limits the classification output of the classifier; the sieve aperture is fixed at 0.5cm, 1.5 cm, 2.0cm, so that the first level is mainly used for the classification of fine broken leaves. The fresh tea leaves can only be divided into 3 levels by the two sizes of 1.5cm and 2.0cm. The drum speed and drum inclination angle are fixed during classification , can only manually control the feed rate to ensure the overall classification rate, the working method is extensive, the feed rate is difficult to control, and the classification efficiency is low

Invention patent 201210037886.8 uses multi-layer screens to achieve grading, but the smallest fresh tea leaves need to be graded multiple times, causing greater damage; the drum inclination and feed rate can be adjusted manually, but it is time-consuming, laborious, imprecise, and complex in mechanical structure

In the invention patent 2013100339166.1, the drum inclination and drum speed are still not adjustable, and the feed rate can only be controlled manually, which results in extensive work and low efficiency

Invention patent 201210273704.7 uses flat sieve vibration to classify fresh tea leaves, because the fresh tea leaves collide with the grading sieve continuously during the grading process, the final fresh tea leaves are seriously damaged

In the utility model patent 201120157386.9, fresh tea leaves are classified by means of a high-power fan. Due to the complexity of the fresh tea leaves and the small difference in the floating speed of fresh leaves at different levels, the classification effect is not good and the energy consumption is large.

[0004] There is a drum-type fresh tea leaf classifier in the form of a round table, with a minimum diameter of 42cm, a maximum diameter of 73cm, and a length of 130cm. The drum is divided into 3 sections, and the size of the sieve holes is 5mm×5mm, 7mm×7mm, and 9mm×9mm. The length of each section is basically equal, the inclination angle of the screen is 6.7°, and the rotating speed of the drum is 13r / min. Short lead to insufficient classification of fresh tea leaves, and fresh tea leaves are easy to block the sieve holes

Another kind of fresh leaf classifier, the minimum diameter is 32cm, the maximum diameter is 70cm, and the length is 115cm. The drum is divided into two sections. The sieve hole specifications are 11mm×11mm and 20mm×20mm square holes respectively. The length of the two sections is equal. The speed of classification is 17r / min , the inclination angle is 9.5°, and the particularly large fresh tea leaves are separated from the discharge end of the drum, but the size of the fresh tea leaves under the first-stage and second-stage drums is very different, and the purpose of grading is not achieved

The above fresh tea classifiers have low grading output and low grading rate. The fresh tea leaves are easy to block the sieve holes and need to be manually fed. The labor intensity is high, and the sieve cannot be replaced. Leaf grading needs, applicability is not strong

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