Planter Row Unit Steering for Equal Row Spacing in Turns
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional agricultural machines face issues with varying lateral spacing between rows during turning operations, leading to overlap, seed competition, and uneven distribution of fertilizer, which affects crop yield and increases weed growth.
Innovation Solution
Agricultural implements are designed with steerable wheels and tool bars to maintain consistent lateral spacing between rows by configuring furrow openers to contact the ground along parallel lines, using oppositely steerable wheel pairs to pivot in opposite directions, and pivotable tool bars to ensure equal spacing during turns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If multiple ranks of row units are used to achieve narrow row spacing, then the lateral distance between rows varies greatly during turning operations, but this causes overlap, seed competition, and uneven fertilizer distribution
Solution Approach 1:
The patent applies dynamics by making the tool bar pivotable relative to the main frame, allowing it to rotate during turning operations. This dynamic adjustment ensures that the furrow openers maintain consistent lateral spacing throughout the turn, preventing overlap and ensuring uniform seed and fertilizer distribution across all row units.
Solution Approach 2:
The patent employs asymmetry through the differential steering of wheel pairs - the first pair steers in one direction while the second pair steers in the opposite direction. This asymmetric steering configuration creates the necessary rotational motion about the turning center axis to maintain equal spacing of contact lines during the turning operation.
2Adaptability or versatility
If the implement turns about a turning center axis, then the implement can change direction, but the lateral distance between rows varies greatly causing operational problems
Solution Approach 1:
The tool bar is designed to be pivotable relative to the main frame, enabling dynamic adjustment during turning operations. This allows the system to adapt to the rotational motion while maintaining stable, consistent lateral spacing between rows, thus preserving row spacing stability during direction changes.
Solution Approach 2:
The patent segments the implement into multiple independent steerable wheel pairs (first pair and second pair), each capable of pivoting independently in opposite directions. This segmentation allows the complex turning motion to be controlled through coordinated action of individual wheel pairs, maintaining row spacing stability during the overall turning operation.
3Device complexity
If conventional row units are used without steerable wheels, then the structure is simpler, but the lateral spacing between rows varies during turning operations
Solution Approach 1:
The patent introduces dynamic steering capability to the wheel pairs, allowing them to pivot during operation. This dynamic feature, while increasing device complexity, enables the system to maintain precise and consistent lateral spacing between rows during turning operations, justifying the added complexity through improved manufacturing precision.
Solution Approach 2:
The differential steering mechanism provides implicit feedback control during turning operations. By steering the first wheel pair in one direction and the second wheel pair in the opposite direction, the system automatically adjusts the tool bar orientation to maintain consistent row spacing, eliminating the need for external feedback systems.
Data Source
AI summary
An agricultural planting system comprises an implement configured to be coupled to a work machine, row units of the implement, and first and second pairs of wheels configured to pivot and rotate to facilitate a turning operation during forward travel of the planting system. The row units are arranged in first and second ranks depending on their forward-aft placement. Furrow openers of the first rank of row units are configured to contact the ground along a first contact line, and furrow openers of the second rank of row units are configured to contact the ground along a second contact line. During a turning operation, the implement turns about a turning center axis, and the first and second pairs of wheels pivot in opposite directions, which allows the first and second contact lines to remain equidistant from the turning center axis during the turn.