Row Unit Coupling With Swing Arms for Ground Following
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Solution Overview
Problem
Agricultural planters face challenges in maintaining consistent seed planting depth and spacing due to ground undulations, leading to deviations in planting depth and spacing between crop rows, which existing row unit coupling devices fail to adequately address.
Innovation Solution
A row unit coupling device with an upper and lower main linkage, swing arm, and walking beam arrangement or parallelogram linkage, allowing for vertical adjustment and angular orientation of row units to maintain perpendicular planting depth and accommodate narrow crop row spacing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If row units are positioned in a side-by-side arrangement with equal distance from the tool bar, then the structure is simple and symmetric, but the spacing between crop rows cannot be reduced to narrow distances
Solution Approach 1:
The patent transitions from a simple side-by-side arrangement to a staggered configuration where row units are positioned at different longitudinal distances from the tool bar. This dimensional change allows narrow crop row spacing while maintaining structural integrity through the complex coupling mechanism involving swing arms and walking beams.
2Manufacturing precision
If row units are rigidly coupled to the tool bar, then the structure is stable and simple, but ground undulations cause deviations in planting depth and seed spacing
Solution Approach 1:
The patent employs dynamic coupling mechanisms including swing arms that pivot and walking beams that can adjust vertically, allowing row units to adapt to ground undulations. This dynamic structure maintains planting depth precision while navigating uneven terrain, contrasting with rigid couplings that would transmit ground variations directly to the row units.
3Adaptability or versatility
If existing rocker arm coupling devices are used, then vertical balancing of row units is achieved, but adaptation to different depths and soil profiles is insufficient
Solution Approach 1:
The patent divides the coupling system into multiple independent components: swing arms for vertical adjustment, walking beams for depth adaptation, and individual row unit couplings. This segmentation allows each component to specialize in specific adaptation functions while maintaining overall vertical balance, providing superior ground following capability compared to unified rocker arm designs.
Data Source
Figure 1
Figure 2
Figure 3A~3B
AI summary
A row unit coupling device (300) for securing a first row unit (50a) and a second row unit (50b) to a tool bar (22) of an agricultural implement is disclosed. The row unit coupling device (300) comprising: an upper main linkage (304a) having a first end (310a) and a second end (3 10b), the second end (310b) of the upper main linkage (304a) configured to be pivotally coupled to the tool bar (22); a lower main linkage (304b) having a first end (310a) and a second end (310a), the second end (310b) of the lower main linkage (304b) configured to be pivotally coupled to the tool bar (22), the lower main linkage (304b) being positioned below, and parallel to, the upper main linkage (304a); a base unit (302) having an upper portion (324) and a lower portion (326), the upper portion (324) being pivotally coupled to the first end (310a) of the upper main linkage (304a) and the first end (310a) of the lower main linkage (304b); an upper arm (306) pivotally coupled to a lower portion (326) of the base unit (302) to rotate about a first axis of rotation (356e), the upper arm (306) having an upper central segment (346), an upper proximal end (368), and an upper distal end (370), the upper proximal and distal ends (368, 370) being at opposing ends of the upper arm (306) and offset from each other in a direction that is parallel to the first axis of rotation (356e), the upper proximal end (368) adapted for pivotal coupling to the first row unit (50a), the upper distal end (370) configured for pivotal coupling to the second row unit (50b); and a lower arm (308) pivotally coupled to the lower portion (326) of the base unit (302) to rotate about a second axis of rotation (356f), the lower arm (308) having a lower central segment (346), a lower proximal end (368), and a lower distal end (370), the lower proximal and distal ends (368, 370) being at opposing ends of the lower arm (308) and offset from each other in a direction that is parallel to the second axis of rotation (356f), the lower proximal end (368) adapted for pivotal coupling to the first row unit (50a), the lower distal end (370) configured for pivotal coupling to the second row unit (50b).