Adjustable Mechanical Linkage for Disk Drill Closing Wheel Angle
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Solution Overview
Problem
Certain soil conditions, such as wetter soils or those with high clay or silt content, hinder the closing system of disk drills from collapsing the sidewall of seed trenches, negatively impacting seed germination and yield.
Innovation Solution
An adjustable mechanical linkage assembly is introduced, allowing the closing wheel's angle to be adjusted relative to its arm via a pivot joint, enabling effective closure of seed trenches even in challenging soil conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the closing wheel uses a fixed angle configuration, then the structure is simple and reliable, but it cannot adapt to different soil conditions (wet soils, high clay/silt content, heavy residue) which prevents effective trench closure
Solution Approach 1:
The closing wheel assembly transitions from a fixed angle configuration to a dynamic, adjustable angle system. The linkage assembly allows the closing wheel shaft to be positioned at multiple discrete angle settings relative to the closing wheel arm, enabling the system to adapt to varying soil conditions while maintaining structural reliability through controlled adjustability rather than continuous complexity.
Solution Approach 2:
The invention changes the angular parameter of the closing wheel shaft relative to the closing wheel arm. By providing multiple discrete angle positions (including substantially orthogonal and acute angles), the system modifies its geometric parameters to optimize performance for different soil types and conditions, directly addressing the adaptability need without requiring complete redesign for each condition.
2Reliability
If the closing wheel shaft angle is adjusted to accommodate different soil conditions, then trench closure effectiveness improves, but the mechanism requires additional components (linkage assembly, pivot joints) increasing complexity
Solution Approach 1:
The closing wheel assembly is segmented into distinct functional components: the closing wheel arm, the closing wheel shaft, and the linkage assembly. This segmentation allows independent optimization of each component and facilitates adjustment of the shaft angle without compromising the integrity of the entire system, thereby improving reliability through modular adaptability.
Solution Approach 2:
The linkage assembly serves as an intermediary mechanism between the closing wheel arm and the closing wheel shaft. It mediates the transmission of force and enables angle adjustment through pivot joints, providing the necessary complexity only where needed to achieve reliable trench closure across varying conditions while keeping the rest of the system simple.
3Adaptability or versatility
If the closing wheel shaft moves about the pivot joint to adjust angle, then adaptability to soil conditions improves, but the structural stability may be compromised
Solution Approach 1:
The system implements controlled dynamics where the closing wheel shaft can pivot about the joint to adjust its angle for different soil conditions, but once positioned, the linkage assembly maintains a stable, rigid configuration. This dynamic positioning capability is balanced with structural stability through the rigid linkage design that prevents unwanted movement while allowing intentional angle changes.
Data Source
AI summary
A row unit closing wheel assembly includes a closing wheel, a closing wheel arm, and a closing wheel shaft having a first end and a second end. The closing wheel is coupled to the first end and the closing wheel arm is coupled to the second end via a pivot joint. The row unit closing wheel assembly includes an adjustable mechanical linkage assembly coupled both to the closing wheel shaft and to the closing wheel arm. The adjustable mechanical linkage is configured to adjust an angle of the closing wheel shaft relative to the closing wheel arm along a horizontal plane via movement of the closing wheel shaft about the pivot joint. The horizontal plane is orthogonal to a rotational axis of the pivot joint.