Transverse Roller Pair for Grain Separation in Combine Harvesters
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Solution Overview
Problem
Combine harvesters face challenges in reducing the proportion of broken grain and losses during the threshing and separation process, particularly due to incomplete threshing and the lack of a protective straw mat in re-threshing, which affects the quality of harvested seeds.
Innovation Solution
Incorporating a pair of rollers arranged transversely to the longitudinal axis of the combine harvester, with relative speed between them, which can be used as a pre-threshing or post-threshing device to separate grain from ears and de-awn and de-husk crop material, reducing grain breakage and improving crop throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a conventional threshing mechanism with a threshing drum and blow bars is used, then threshing and separation of grain from ears is achieved, but the proportion of broken grain increases due to lack of protective straw mat
Solution Approach 1:
The patent applies preliminary action by introducing a pair of rollers before the conventional threshing drum to perform preliminary threshing and de-awning. This preliminary processing reduces the load on the main threshing drum and prevents excessive grain breakage during the subsequent threshing process, thereby maintaining grain quality while ensuring productive threshing.
Solution Approach 2:
The patent uses an intermediary approach by inserting a pair of rollers between the crop flow and the conventional threshing drum. These rollers act as a mediator that gently processes the crop material, performing initial threshing and de-awning without causing excessive grain breakage, thus protecting the grain quality while maintaining threshing efficiency.
2Reliability
If re-threshing is performed without protective straw mat, then incomplete threshing is addressed, but grain breakage increases
Solution Approach 1:
The patent applies preliminary action by performing preliminary threshing and de-awning with the roller pair before the crop enters the conventional threshing drum. This preliminary processing ensures more complete threshing while protecting grain quality, eliminating the need for subsequent re-threshing that would cause additional grain breakage.
3Manufacturing precision
If the cleaning device is overloaded to handle all crop material, then complete separation is achieved, but processing time increases
Solution Approach 1:
The patent applies preliminary action by using the roller pair to perform preliminary threshing and de-awning before the crop reaches the cleaning device. This preliminary processing reduces the volume and complexity of material that needs to be processed by the cleaning device, thereby maintaining separation quality while reducing processing time and preventing overload.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively reduces the proportion of broken grain and losses by partially threshing, de-awning, and de-husking crop material before it reaches the cleaning device, enhancing the quality of the harvested crop without overloading the cleaning system.
Implementation Method 1
the first roller and second roller have a relative speed to one another... the first roller and the second roller cause grain to be separated or rubbed out of the ears in the sense of a threshing process
Implementation Method 2
The rollers have a surface made of an elastic material. This design of the rollers is advantageous in order to avoid grain breakage during the treatment of the crop, i.e. threshing
Implementation Method 3
the cleaning device includes a blower and several sieves, which are subjected to an air flow by the blower
Data Source
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AI summary
The present invention relates to combine harvesters (1) with at least one device (3, 17) for separating a crop flow into at least two crop flows having different compositions of crop components, which deliver at least one crop flow to at least one conveying floor (12) associated with the device (3, 17), which transfers the crop flow to a cleaning device (4), wherein at least one pair of rollers (27) extending transversely to the longitudinal axis of the combine harvester (1) is provided as a device for separating the crop flow, the first roller (28) and second roller (29) of which have a relative velocity to each other.