Litchi sieving and grading machine and litchi sieving and grading method

Abstract

The invention discloses a litchi sieving and grading machine and a litchi sieving and grading method. The litchi sieving and grading machine consists of a fence type fruit discharging slot, a mesh-belt conveyor, a cull fruit conveyor and at least two size grading machines, wherein grids for filtering small foreign matters are arranged in the fence type fruit discharging slot; a spreading device and a sprinkling and cleaning device are arranged in the mesh-belt conveyor; rotten fruit throwing holes are arranged at both sides of the mesh-belt conveyor and led to the cull fruit conveyor; each group of size grading machine is provided with a flowing sieve which consists of two groups of chains and chain guide racks, a friction rack and a supporting roller; and the supporting roller space of the first group of size grading machine is smaller than that of the second group of size grading machine. The invention has simple structure, easy production and manufacture and convenient use and operation and is used for sieving and grading litchi with high precision and the lowered labor strength; and the sizes of the sieved litchi of the same grade are uniform, thus market demands are satisfied.

Description

technical field [0001] The invention relates to a device for size grading of litchis and a method for screening and grading litchis by using the device, belonging to the technical field of fruit processing machinery. Background technique [0002] The existing lychee size classification mainly relies on manual sorting, which not only has long working hours and high labor intensity, but also cannot ensure the same size of lychees sorted by the same grade, thus affecting the sorting accuracy. Although, existing fruit classifiers are a lot, for example, fruit classifiers such as apple, citrus, because the gap between supporting roller is too large, is not suitable for lychee classification. Along with social progress, people's living standard improves constantly, and people's selectivity to food fruit is strengthened, and the size of litchi sold on the market is mixed, can not satisfy people's demand. Contents of the invention [0003] The purpose of the present invention is ...

AI Technical Summary

Problems solved by technology

[0002] The existing lychee size classification mainly relies on manual sorting, which not only has long working hours and high labor intensity, but also cannot ensure that the lychees selected by the same grade are of the same size, thus affecting the sorting accuracy

Although there are many existing fruit grading machines, for example, apple, citrus and other fruit grading machines are not suitable for lychee grading because the gap between the rollers is too large

With the progress of society, people's living standards continue to improve, and people's choice of food and fruit is strengthened. The lychees sold in the market are of mixed sizes, which cannot meet people's needs.

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