Stepped Lateral Surface for Combine Harvester Separation
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Solution Overview
Problem
The existing separation units in combine harvesters face limitations in increasing separation performance due to restricted installation space and higher power consumption when increasing rotor speed, leading to straw compaction and reduced grain separation efficiency.
Innovation Solution
A separation unit with a stepped or edged lateral surface on the lid, which deflects the crop flow and reduces friction, incorporating guide elements and a rake to enhance mixing and segregation, thereby improving separation performance without increasing the separation area or rotor speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the separation rotor speed is increased to improve separation efficiency, then separation performance is improved, but power consumption increases and straw destruction increases
Solution Approach 1:
The lateral surface is segmented into multiple steps arranged in the circumferential direction, creating multiple impaction zones that repeatedly deflect and mix the crop flow, improving separation efficiency without increasing rotor speed
Solution Approach 2:
The invention introduces a stepped structure in the circumferential dimension of the lateral surface, adding a new spatial dimension to the crop flow path. This creates multiple deflection planes that enhance mixing and separation without requiring higher rotational speeds
2Productivity
If the separation rotor speed is increased to improve separation efficiency, then separation performance is improved, but straw compaction increases
Solution Approach 1:
The stepped structure divides the continuous crop flow into multiple segmented impaction zones, creating repeated deflections that prevent straw from compacting into a continuous mat on the separation surface
Solution Approach 2:
The stepped lateral surface creates periodic impactions as the crop flow repeatedly strikes each step in sequence, providing continuous mixing and preventing the formation of a compact straw mat that would block grain passage
3Productivity
If the separation area is enlarged to improve separation efficiency, then separation performance is improved, but the device complexity increases
Solution Approach 1:
Instead of uniformly increasing the entire separation area, the invention applies a localized stepped structure to the lateral surface, creating high-energy mixing zones at specific locations to enhance separation efficiency without proportionally increasing overall device complexity
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 stepped or edged lateral surface design reduces power consumption, prevents straw compaction, and enhances grain separation efficiency by repeatedly deflecting and mixing the crop flow, achieving improved separation performance within existing constraints.
Implementation Method 1
The centrifugal forces exerted by the separating rotor act equally on the grain to be separated from a crop stream and on the straw contained in the crop stream
Implementation Method 2
A crop flow guided along the lateral surface experiences impulses from the stepped lateral surface, deflecting the crop flow away from the lateral surface. This reduces friction on the lateral surface
Data Source
Figure 1
Figure 2
Figure 3a~3b
AI summary
The invention relates to a separation unit (7) for a self-propelled combine harvester (1), which operates according to the axial flow principle, comprising a rotatably mounted separator rotor (24) which is arranged in a housing (25) which includes a separator basket (26) provided with openings and a cover (27) having a closed outer surface (31), wherein the outer surface (31) is stepped on its side facing the separator rotor (24).