Harrow Disc Recess Geometry for Soil Mixing and Blockage Prevention
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Solution Overview
Problem
Conventional harrow discs face issues with soil mixing efficiency and stability, particularly when working with liquid manure or wet soil conditions, leading to blockages, increased weight, and higher energy requirements due to their closed disc surface design.
Innovation Solution
A harrow disc design featuring recesses with a larger surface area outside the base circle, arranged between a root and tip circle, which allows for effective soil passage and distribution, enhancing mixing while maintaining stability through a balanced distribution of surface areas and recess geometry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If recesses are formed in the disc surface to allow soil passage, then soil mixing efficiency is improved, but the effective disc surface area is reduced
Solution Approach 1:
The recesses are strategically positioned and sized to create local variations in surface properties. The larger surface area outside the base circle provides optimized soil passage zones while maintaining sufficient effective working surface area within the base circle for stable soil engagement and mixing.
2Stability of the object's composition
If the disc surface is closed to maintain structural stability, then stability is improved, but soil accumulation and blockages occur
Solution Approach 1:
The disc surface is segmented into distinct zones: a base circle providing structural stability and a surrounding area with recesses that enables soil passage. This segmentation allows the disc to maintain overall stability while preventing harmful soil accumulation through the strategically designed recesses.
3Productivity
If recesses are positioned close to the edge to increase soil passage, then soil mixing is improved, but the recesses become completely filled with soil at working depths
Solution Approach 1:
The recesses extend in multiple dimensions with portions both inside and outside the base circle. This dimensional arrangement ensures that the outer portions remain accessible for soil passage while the inner portions maintain structural integrity, preventing complete filling at working depths.
4Productivity
If the disc surface area is increased to improve mixing, then mixing efficiency is improved, but the weight and energy consumption increase
Solution Approach 1:
The recess geometry parameters are optimized to achieve the desired mixing efficiency. By controlling the size, shape, and distribution of recesses, the design achieves effective soil passage and mixing while minimizing the additional weight compared to a solid disc, thereby reducing energy consumption.
Data Source
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AI summary
The invention relates to a harrow disc (10) for a disc harrow (40) with a) a circular outer contour (15) and b) recesses (11.1 to 11.i) formed between a center point (12) of the harrow disc (10) and the outer contour (15), wherein c) the recesses (11.1 to 11.i) are arranged on a base circle (18) with a base radius (r18) that is half the distance between the center point (12) and the outer contour (15), and the recesses (11.1 to 11.i) extend inside and outside the base circle (18), and d) a portion of the area of a recess (11.i) located outside the base circle (18) is larger than a portion of the area of the recess (11.i) located inside the base circle (18), characterized in that e) the Sum of the areas of the recesses (11.1 to 11.i) between 10% and 25%, preferably between 15% and 25%, particularly preferably between 15% and 20% of the area of the circular shape (16) of the outer contour (15).