Offset Twin Disk Seeder for Uniform Seed Placement
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Solution Overview
Problem
Existing agricultural seeders with twin disk drills often result in non-uniform seed rows due to soil and residue being carried and deposited in front of the disks, leading to uneven seed placement and depth.
Innovation Solution
The disks are longitudinally offset relative to each other, allowing soil to be released instead of carried, resulting in uniform seed placement and depth, achieved by positioning the disks on a common fork to displace soil towards each other as they rotate, with possible asymmetrical alignment or different diameters to enhance soil release.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If twin disk drills are mounted in mirror image relation and directly opposed, then the disks can squeeze soil and residue together as they rotate, but soil and residue are held between the disks and deposited in front of the disks resulting in non-uniform seed row and uneven seed placement depth
Solution Approach 1:
The patent applies asymmetry by offsetting the two disk drills longitudinally so they are not directly opposed. Instead of being in mirror image relation facing each other, the disks are positioned at different longitudinal locations, creating an asymmetric configuration that prevents soil and residue from being trapped between them. This asymmetric arrangement allows soil to be released rather than carried forward, eliminating the harmful soil buildup that causes non-uniform seed placement.
2Device complexity
If twin disk drills are directly opposed, then the structure is simpler with fewer components, but the seed row becomes non-uniform and requires additional maintenance
Solution Approach 1:
The patent modifies the simple directly-opposed configuration by introducing longitudinal offset between the two disks. This asymmetric positioning maintains structural simplicity while fundamentally improving reliability by preventing soil accumulation that would otherwise cause non-uniform seed rows and require maintenance. The offset configuration is the minimal structural change needed to achieve reliable operation.
3Manufacturing precision
If soil is released instead of carried by the disks, then uniform seed placement is achieved, but this requires longitudinally offsetting the disks which increases structural complexity
Solution Approach 1:
The patent achieves uniform seed placement through asymmetric longitudinal offsetting of the disks, where the two disk drills are positioned at different distances from the trailing edge of the implement. This creates the necessary soil release condition without requiring complex additional structures. The asymmetry is implemented through straightforward positioning adjustments rather than complex mechanisms.
Solution Approach 2:
The patent applies local quality by making the offset distance adjustable, allowing the configuration to be optimized for different soil conditions and seeding requirements. This enables local adaptation of the disk positioning to achieve uniform seed placement across varying field conditions without requiring a completely complex structure.
4Productivity
If non-offset twin disk drills are used, then the implement can operate at lower speeds with simpler structure, but productivity is reduced and fuel usage increases due to uneven seed placement requiring re-seeding
Solution Approach 1:
The asymmetric longitudinal offset configuration enables the implement to operate at higher speeds while maintaining uniform seed placement. By preventing soil buildup in front of the disks, the offset arrangement allows consistent seed depth even at increased operating speeds, thereby improving productivity without sacrificing placement precision.
Data Source
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AI summary
A seeder implement (125) includes a fork (146) having a first spindle support arm (150) that supports a first spindle (164) and a second spindle support arm (152) that supports a second spindle (168). A first disk (160) is supported on the first spindle (164), wherein the first spindle (164) is oriented in a first orientation and at a first acute angle relative to a lateral line. The first disk (160) is oriented at a second acute angle relative to the ground surface. A second disk (166) is supported on the second spindle (168), wherein the second spindle (168) is oriented in a second orientation and at a third acute angle relative to the lateral line. The second disk (166) is oriented at a fourth acute angle relative to the ground surface. The first disk (160) is longitudinally offset ahead of the second disk (166), and there are no structural components between the first and second disks (160, 166) other than the first and second spindles (164, 168). In one embodiment, a packing wheel (142) is disposed to close and compact furrows opened by the disks (160, 166) and is disposed in the same orientation as one of the disks (160, 166).