Planter Seed Meter Accelerator Wheel Timing Correction
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Solution Overview
Problem
Modern farming practices face challenges in maintaining seed depth placement and spacing accuracy at faster travel speeds, leading to seed tumble and inconsistent seed spacing during planting operations.
Innovation Solution
The implementation of an accelerator wheel system in seed meters that corrects timing and spacing anomalies by catching seeds from seed disks and accelerating them to match the planter's travel speed, ensuring consistent release and minimizing seed tumble.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If planter travel speed is increased to reduce operating time, then productivity improves, but seed spacing accuracy deteriorates due to seed tumble and inconsistent release
Solution Approach 1:
The accelerator wheel acts as an intermediary device between the seed disk and the seed trench. It receives seeds from the seed disk, accelerates them to match planter travel speed, and delivers them to the trench. This mediator ensures that even at high planter speeds, seeds are delivered with the correct relative velocity to maintain spacing accuracy and prevent tumble.
Solution Approach 2:
The system changes the velocity parameter of seeds by using the accelerator wheel to increase seed delivery speed to match planter travel speed. The accelerator wheel rotates at a speed that imparts horizontal velocity to seeds, transforming them from a downward trajectory to a horizontal trajectory that matches the planter's movement, thereby maintaining consistent spacing at higher travel speeds.
2Loss of time
If planter travel speed is increased, then operating time is reduced, but seed depth placement deteriorates due to seed tumble
Solution Approach 1:
The accelerator wheel serves as a mediator that controls seed velocity and trajectory. By accelerating seeds to match planter speed and delivering them horizontally rather than dropping them vertically, it prevents seed tumble in the furrow that would cause inconsistent depth placement, allowing high-speed operation without sacrificing planting precision.
Solution Approach 2:
The accelerator wheel applies preliminary acceleration to seeds before they enter the seed trench, giving them the horizontal velocity needed to match planter travel speed. This preliminary action prevents the harmful effect of seed tumble and ensures consistent depth placement even at high travel speeds.
3Productivity
If seeds are delivered at faster equipment speeds, then productivity improves, but seed spacing consistency deteriorates due to timing anomalies and bounce down seed tube
Solution Approach 1:
The accelerator wheel mediates between the seed disk release mechanism and the seed trench delivery. It captures seeds with timing anomalies, holds them in its pockets, and releases them at consistent intervals matched to planter speed. This eliminates the bounce-down effect and timing variations that occur at higher speeds, maintaining uniform seed spacing.
Solution Approach 2:
The accelerator wheel uses periodic rotation to deliver seeds at consistent intervals. Each pocket on the wheel delivers one seed at a time in a regular, periodic manner that is synchronized with planter travel speed. This periodic action ensures consistent seed spacing regardless of the planter's travel speed or variations in seed disk release timing.
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 accelerator wheel system significantly improves seed spacing and timing by increasing seed velocity, eliminating seed tumble and ensuring seeds are released with a relative velocity of approximately zero mph with respect to the ground, maintaining planting quality at higher speeds.
Implementation Method 1
The accelerator wheel system corrects timing and thus spacing anomalies of seeds being released from seed disks by catching all of the seeds from the seed disks, including any seeds mis-released from the seed disks, and properly spacing the seeds by moving and receiving them into equally spaced pockets of an accelerator wheel
Implementation Method 2
Spacing and timing is also improved by reducing delivery variation typically attributable to bounce down a seed tube by smoothly rotationally redirecting seeds from a generally downward delivery direction from a seed disk to a generally horizontal delivery direction out of the accelerator wheel system, opposite the tractor and implement travel direction
Implementation Method 3
The accelerator wheel increases the velocity of the seeds to release the seeds from the accelerator wheel system with a horizontal velocity component that is the same as the travel speed of the planter. This provides a relative velocity of the released seeds with respect to the ground or field of approximately zero mph, substantially eliminating seed tumble during planting
Data Source
AI summary
A planter includes seed meters with accelerator wheel systems. Each accelerator wheel system receives singulated seeds from a respective seed meter and spaces the seeds with respect to each other to correct timing and thus spacing anomalies of seeds being released from seed disks of the seed meters at incorrect seed disk release events. Each accelerator wheel system adjusts and to adjust the velocity of the seeds to correspond to planter travel speed for releasing the seeds to drop straight down onto the field, without a horizontal velocity. Seeds are rotationally redirected from a generally downward delivery direction from a seed disk to a generally horizontal delivery direction out of the accelerator wheel system, opposite the tractor and implement travel direction.