Seed Metering Disc Recesses for Uniform Canola Seeding
Solution Overview
Problem
Current seed metering devices for air seeders face challenges in achieving uniform seed spacing, particularly for crops like canola, where the small seed size and high desired plant population lead to uneven seed distribution due to the pulsing nature of seed flow and vibration issues at low rotational speeds.
Innovation Solution
A seed metering apparatus featuring a feed shaft with a plurality of disc recesses that rotate at a higher speed than conventional feed rollers, with a shield plate to seal the feed opening and direct seeds into a seed receiver, reducing pulsations and vibration effects, and allowing for interchangeable disc assemblies for different seed sizes and rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional feed roller with recesses is used to meter seeds, then the device can dispense seeds in pulses, but the pulsing nature of seed flow causes uneven seed spacing particularly for small seeds like canola
Solution Approach 1:
The feed roller surface is segmented into multiple recesses distributed around the circumference, with each recess capable of holding multiple seeds. This segmentation allows the roller to dispense seeds in controlled groups rather than continuous pulses, smoothing the overall seed flow pattern and improving spacing uniformity for small seeds like canola.
Solution Approach 2:
The invention changes the parameters of the metering device by increasing the number of recesses on the feed roller and adjusting their distribution. This parameter change transforms the pulsing seed flow into a more continuous and uniform flow, reducing the harmful pulsing effect while maintaining efficient seed dispensing.
2Productivity
If the feed roller rotates at high speed to increase seed dispensing rate, then productivity increases, but vibration effects become more significant and disrupt seed flow uniformity
Solution Approach 1:
By segmenting the feed roller surface into multiple recesses distributed around the circumference, the invention allows the roller to rotate at higher speeds while distributing the seed dispensing action across multiple locations. This segmentation reduces the impact of vibration at any single point while maintaining high productivity through increased rotational speed.
Solution Approach 2:
The recesses on the feed roller act as intermediaries that buffer the relationship between rotational speed and seed dispensing. These recesses absorb and smooth out vibration effects while still allowing high-speed rotation to maintain productivity, effectively mediating between the conflicting requirements of high speed and vibration reduction.
3Manufacturing precision
If the feed roller rotates at low speed to reduce vibration effects, then seed flow uniformity improves, but productivity decreases
Solution Approach 1:
The feed roller is segmented into multiple recesses that can dispense seeds simultaneously at different locations around the circumference. This segmentation allows the roller to rotate at moderate speeds while maintaining seed flow uniformity through distributed dispensing, avoiding the need for extremely low speeds that would reduce productivity.
Solution Approach 2:
The periodic rotation of the feed roller with multiple recesses creates a rhythmic dispensing pattern that smooths out seed flow. This periodic action with multiple phases allows the system to operate at higher speeds while maintaining uniformity, as the periodic dispensing from multiple recesses averages out to create consistent seed flow.
4Adaptability or versatility
If a single feed roller configuration is used for all seed types, then device simplicity is maintained, but adaptability to different seed sizes and rates is limited
Solution Approach 1:
The feed roller design with multiple recesses of varying sizes and distributions provides universal functionality across different seed types. By having recesses that can accommodate different seed dimensions and by adjusting the number and arrangement of recesses, a single roller design can adapt to metering various seed types including corn, canola, and wheat without requiring completely different roller configurations.
Solution Approach 2:
The invention introduces dynamic adjustability to the feed roller system, allowing the number, size, and distribution of recesses to be modified based on the specific seed type being metered. This dynamic capability enables the same basic roller structure to adapt to different seed types and seeding rates, improving versatility without requiring multiple specialized rollers.
Data Source
AI summary
A seed metering apparatus includes a seed container with a feed opening in a bottom thereof. A feed shaft is rotatably mounted across the feed opening. A feed disc is mounted to the shaft and disc recesses are spaced along a periphery thereof An upright shield plate extends across the feed opening adjacent to the shaft and defines a disc slot having a width corresponding to a thickness of the disc. An output portion of the feed disc extends through the disc slot forward of a front face of the shield plate. The feed shaft, feed disc, and shield plate are configured such that the shield plate seals the feed opening, and such that an intake portion of the feed disc is in the feed opening exposed to seeds. Rotation of the feed shaft carries seeds out of the seed container in the disc recesses and into a seed receiver.