Air Seed Meter Radially Adjustable Singulator
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Solution Overview
Problem
Existing seed meters, both mechanical and air-based, face challenges in ensuring accurate singulation and spacing of seeds, with air seed meters struggling to draw seeds from stagnant pools and experiencing seed ricochet or displacement due to housing proximity, and requiring cumbersome disc changes for varying conditions.
Innovation Solution
An air seed meter with a radially adjustable singulator featuring blades with ramps, allowing for adjustable aggressiveness and easy disc installation/removal, and a unique drive mechanism for precise seed spacing control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If air seed meters use a disc with apertures to create suction force for seed singulation, then singulation accuracy is improved across wider speed ranges, but the suction force becomes insufficient to draw seeds from stagnant seed pools
Solution Approach 1:
The patent introduces a radially adjustable singulator that can dynamically change its position relative to the seed disc. The singulator includes a radially movable member with fingers that can be adjusted to different radial positions to optimize seed singulation under varying conditions, allowing the system to adapt between drawing seeds from stagnant pools and maintaining singulation accuracy at different speeds.
Solution Approach 2:
The patent employs parameter changes by making the singulator radially adjustable. The radial position of the singulator fingers can be changed to modify the interaction with seeds on the disc, enabling the system to overcome insufficient suction force from stagnant pools while maintaining singulation accuracy across different operating conditions.
2Measurement precision
If seeds are released from at or near the edge of the seed disc, then seed spacing is improved, but seeds are susceptible to increased ricochet or bounce
Solution Approach 1:
The patent introduces a singulator as an intermediary element between the seed disc and the seed pool. The singulator includes fingers that gently guide and singulate seeds before they are released, reducing the harmful ricochet effect while maintaining accurate seed spacing. The singulator acts as a mediator that controls seed release without the harsh impact of housing sidewalls.
3Volume of moving object
If the housing sidewall is positioned close to the seed disc for compact design, then device compactness is improved, but seeds are knocked free of cells by the sidewall during rotation
Solution Approach 1:
The singulator serves as an intermediary between the compact housing sidewall and the seed disc. It provides a controlled interface for seed release that prevents the sidewall from directly knocking seeds free, thereby maintaining both compact housing design and reliable seed dispensing.
4Productivity
If mechanical fingers are used to grip and release seeds, then seed metering is achieved, but duplicate seeds and skips occur frequently
Solution Approach 1:
The patent replaces the mechanical finger gripping system with an air seed meter that uses a disc with apertures creating suction force. This substitution eliminates the mechanical contact that causes duplicate seeds and skips, achieving more reliable singulation through pneumatic principles.
Solution Approach 2:
The radially adjustable singulator provides dynamic control over seed singulation, allowing the system to adapt to different seed types and conditions, thereby improving singulation accuracy compared to fixed mechanical finger systems.
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
Improves seed singulation accuracy, reduces duplicate seeds, and simplifies the process of adjusting seed spacing and disc changes, enhancing planting efficiency and yield consistency across varying conditions.
Implementation Method 1
A pressure differential is formed across opposite sides of the seed disc, which generates a suction force at the seed cell apertures
Implementation Method 2
seeds are drawn onto or against the seed cells and remain thereon until the seed cell passes through a region of the housing with a reduced pressure differential
Data Source
AI summary
A seed metering system, for use on a row crop planter, selects individual seeds from a seed reservoir and dispenses the seeds singularly at a controlled rate. A direct drive seed metering system includes a seed disc having a plurality of suction apertures with a recessed pocket adjacent to an aperture. The recessed pockets act to agitate seeds in the seed reservoir and to direct seed flow towards the apertures. A seed path relief system aids in the placement of the seeds such that they are released from an outer edge of the seed disc. An adjustable seed singulator is mounted adjacent to the face of the seed disc where inner and outer blades are adjusted radially to compensate for the singulation of various seed sizes and shapes. The seed disc is driven via engagement of an internal gear with the external gear of an independent drive motor.