Parallel Link Furrow Opener Maintains Constant Angle
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Solution Overview
Problem
Trailing arm furrow opener assemblies face challenges in maintaining consistent seed depth in uneven terrain due to varying frame height, leading to inconsistent furrow depth and presentation angles, which affect seed placement and furrow formation.
Innovation Solution
A trailing arm furrow opener apparatus where the furrow opener is attached only to the rear link of a parallel link assembly, and the packer wheel is fixed to one of the parallel arms, allowing the furrow opener to maintain a constant presentation angle while adjusting the depth by varying the implement frame's vertical position, ensuring consistent seed placement across varying terrain.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a trailing arm furrow opener assembly is used where the furrow opener is attached to the middle portion of the trailing arm, then the structure is simpler, but the furrow depth becomes inconsistent when the frame height varies in uneven terrain
Solution Approach 1:
The trailing arm assembly is segmented into multiple independent components: the trailing arm itself, a parallel link assembly with upper and lower links, and a furrow opener assembly. The furrow opener is detachably connected to the parallel link assembly, allowing independent adjustment and maintenance of each component. This segmentation enables the system to maintain furrow depth consistency by isolating the depth control function to the parallel link mechanism while keeping the overall structure manageable.
Solution Approach 2:
The parallel link assembly introduces dynamic adjustment capability to the trailing arm system. The upper and lower links can pivot relative to each other, allowing the furrow opener depth to be adjusted independently of the frame height variations. This dynamic mechanism compensates for terrain changes and maintains consistent furrow depth despite variations in implement frame position.
2Manufacturing precision
If the furrow opener is rigidly attached to the trailing arm, then the presentation angle varies with terrain, but if the presentation angle is kept constant, then the depth control becomes more complex
Solution Approach 1:
The parallel link assembly acts as an intermediary mechanism between the trailing arm and the furrow opener. It decouples the presentation angle control from the depth control functions. The upper and lower links transmit motion while maintaining a relatively constant presentation angle of the furrow opener, even as the depth is adjusted through the pivoting action of the links. This intermediary mechanism resolves the conflict between angle consistency and depth control.
3Manufacturing precision
If the packer wheel is attached to move with the furrow opener in parallel link assemblies, then furrow depth is maintained, but seed placement accuracy deteriorates on hard and lumpy soil
Solution Approach 1:
The system segments the functions of depth control and seed placement into separate mechanisms. The parallel link assembly controls furrow depth through its geometric constraints, while the furrow opener's cutting action and seed tube positioning are independently optimized for accurate seed placement. This segmentation allows the packer wheel to follow the furrow opener's depth adjustments without directly coupling their motions, reducing the transmission of erratic movements to the seed placement mechanism.
Data Source
AI summary
A trailing arm furrow opener apparatus includes a furrow opener bracket attached to the rear link of a parallel link assembly such that the furrow opener bracket and furrow opener attached thereto is maintained in a constant fore and aft angular orientation as the assembly moves up and down. A pucker wheel arm is fixed to one of the upper and lower parallel arm members of the parallel link assembly, and extends rearward from the rear link, and a packer wheel is mounted to the packer wheel arm. A bias device exerts a downward force on the assembly. The presentation angle of the furrow opener with respect to the ground is maintained constant while the assembly moves up and down.