Curved Crop Separator Edge Reduces Wear
Solution Overview
Problem
Existing crop separation devices, such as axial threshing separating rotors, suffer from high wear rates of crop treatment elements due to abrasive effects from crop materials, leading to short service lives and frequent replacement needs.
Innovation Solution
The use of crop treatment elements with a fluidically optimized, curved front edge and a high-hardness coating, along with a cuboid cross-section, reduces surface pressure and wear, while adaptable design accommodates different crop types, and materials like hardenable steel can be case-hardened for enhanced durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If sharp-edged strips are used for threshing, then aggressiveness for threshing is achieved, but wear on the strips increases due to high surface pressure
Solution Approach 1:
The front edge of the strip is designed with a curved, fluidically optimized course instead of a sharp edge. This curvature distributes the crop load more evenly along the front edge, reducing peak surface pressure and consequently reducing wear on the strip while maintaining threshing effectiveness
Solution Approach 2:
The strip design differentiates between the front edge region and the body region. The front edge has a curved, fluidically optimized shape for reduced wear, while the body maintains a cuboid cross-section for structural integrity and threshing function. This local differentiation allows each region to optimize its specific function
2Force
If ramp-shaped support elements with rectangular cross section are used, then threshing aggressiveness is achieved, but surface pressure on the front edge increases leading to high wear
Solution Approach 1:
The front edge of the support element is designed with a curved, fluidically optimized course that replaces the sharp rectangular edge. This curvature distributes the crop load along a longer path, reducing the concentration of surface pressure at any single point while maintaining the aggressiveness needed for effective threshing
3Object-affected harmful factors
If strips with circular cross section are used, then grain breakage is reduced, but wear protection coating is removed by crop at short intervals
Solution Approach 1:
The front edge is designed with a curved, fluidically optimized course that reduces peak surface pressure and distributes crop loads more evenly. This reduces the abrasive stress on the wear protection coating, extending its service life while maintaining the rounded geometry that prevents grain breakage
Solution Approach 2:
The strip combines a base material with a wear protection coating. The curved front edge design reduces the rate of coating removal by distributing mechanical stresses, thereby extending the functional life of the composite structure before replacement is needed
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
This design significantly extends the service life of crop treatment elements by reducing wear and allowing for adaptation to various crop types, ensuring consistent performance and reduced maintenance.
Implementation Method 1
the front edge pointing counter to a conveying direction of the crop with a fluidically optimized, curved course
Implementation Method 2
The front edge is at least partially provided with a coating to increase wear resistance
Implementation Method 3
The aggressiveness with which the crop is affected during the threshing process is ensured by the essentially cuboid cross-section
Data Source
Figure 1
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Figure 3
AI summary
The present invention relates to a separation device (2, 4) comprising rotatingly driven components (11, 19) and stationary components with at least one crop treatment element (30, 31, 32) extending at least partially transversely to the direction of rotation (R) of the components for processing crops, wherein the at least one crop treatment element (30, 31, 32), which has a substantially cuboid cross-section, has a leading edge (40) pointing in the direction of rotation (R) or against a conveying direction (FR) of the crop with a flow-optimized, curved profile.