Seed Guide Element Tapered Profile
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Solution Overview
Problem
Existing seed drills with circular cross-section seed guide elements experience uneven seed or fertilizer distribution due to varying grain speeds, leading to zigzag movements and uneven longitudinal distribution, resulting in suboptimal field utilization.
Innovation Solution
A seed guide element with a tapered cross-sectional profile, featuring a narrower bottom section and wider top section, restricts transverse movement and promotes grains to slide one on top of the other, reducing wobbling and ensuring consistent longitudinal distribution by minimizing transverse movements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a circular cross-section seed guide element is used, then the structure is simple and easy to manufacture, but the seeds execute zigzag tumbling motion resulting in uneven longitudinal distribution
Solution Approach 1:
The patent applies asymmetry by changing the seed guide element from a circular cross-section to an oval cross-section with different dimensions in longitudinal and transverse directions. The transverse dimension is specifically designed to be smaller to restrict lateral movement, while the longitudinal dimension allows sufficient passage. This asymmetric geometry eliminates the zigzag tumbling motion of seeds and ensures uniform longitudinal distribution without significantly complicating manufacturing.
2Manufacturing precision
If the transverse dimension of the seed guide element is reduced, then the tumbling motion is restricted and longitudinal distribution improves, but the seed guide element width must be precisely optimized
Solution Approach 1:
The patent applies parameter changes by establishing specific dimensional relationships for the oval cross-section. The transverse dimension is set to 60-80% of the longitudinal dimension, creating an optimized geometric parameter range that effectively restricts tumbling motion while maintaining ease of manufacture. This parameter optimization provides a clear design guideline without excessive complexity.
3Quantity of substance
If seeds are discharged at low application rate with large distances between grains, then individual grain guidance is improved, but transverse velocity components cause zigzag motion in circular sections
Solution Approach 1:
The asymmetric oval cross-section with reduced transverse dimension creates lateral confinement that stabilizes grain trajectories. Even at low application rates where grains are spaced far apart, the transverse walls of the oval section prevent velocity vector deviations and zigzag motion, ensuring each grain follows a stable path to the outlet.
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 tapered design enhances the uniformity of seed or fertilizer distribution, reducing wobbling and overlay issues, resulting in a more consistent and efficient application across the field.
Implementation Method 1
the seed guide element, viewed in cross-section, has a base section on its underside facing the field soil and a top section on its top side facing away from the field soil, the base section having a smaller width than the top section
Implementation Method 2
The velocity vectors of the grains released into the conveyor channel by the metering device in free fall can be aligned both in the conveying direction and transversely to the conveying direction
Data Source
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AI summary
The present invention relates to a seed guide element (5) of a seed coulter (7) of a seed drill (1), which applies seed supplied by a metering device (4) from a container (2) to a field surface (22), wherein the seed guide element (5), which has a closed hollow profile, is connected to a conveying channel (11) of the metering device (4) having a metering outlet (13), wherein the seed guide element (5) has an outlet opening (21) oriented against the direction of travel in the area of the seed coulter (7), wherein the seed guide element (5) has, in cross-section, on its underside (23) facing the field surface (22) a bottom section (25) and on its upper side (24) facing away from the field surface (22) a top section (26), wherein the bottom section (25) has a smaller guiding width (32) than the Ceiling section (26).