Secondary impurity cleaning device

Abstract

The invention discloses a secondary impurity cleaning device which comprises a secondary impurity cleaning screen, a secondary impurity cleaning screen frame, a connecting supporting plate and a zigzag guiding plate, wherein the secondary impurity cleaning device is arranged between an upper screen and an impurity auger discharging hole. The secondary impurity cleaning device has a novel and simple structure, is convenient to disassemble, assemble and adjust, not only prevents the impurity from entering a re-threshing roller and further avoids increase of kernel damage, but also enables the impurity delivered by an impurity auger to be distributed uniformly through the zigzag guiding plate, has certain cleaning capacity, and can effectively achieve the functions of cleaning, sorting and screening.

Description

technical field [0001] The invention relates to a secondary residue cleaning device of a harvesting machine, which is mainly used for screening and uniformly distributing the secondary residue of various crops such as rice, wheat, barley and rapeseed. Background technique [0002] When the full-feed rice, wheat and oil combine harvester is working, the mixture composed of grains, broken stems and chaff, which are threshed by the threshing drum and separated from the concave plate sieve, enters the vibrating cleaning screen. Under the action of the vibrating sieve, the grains are separated from the mixture and enter the grain auger under the vibrating sieve to be sent to the grain collection box. However, there are still some broken ears, short stalks, grass blades and grains that have not been completely threshed and have mature grains, which are pushed to the second half of the vibrating screen and the tail sieve to fall. If they enter the grain collecting box after enteri...

AI Technical Summary

Problems solved by technology

At present, there are two ways to deal with the collected residues. One is that the residues enter the re-extraction device for secondary threshing, enter the cleaning screen from the separation concave plate, and perform cleaning operations again. This method has a complicated structure and the grain The second entry into the threshing drum increases the number of times the kernel is hit, resulting in increased kernel damage

Another way is to spray the residue directly on the screen surface of the upper sieve for secondary cleaning. Due to the direct spraying, the material will be unevenly distributed on the screen surface, which will reduce the cleaning performance.

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