Row Unit Trench Depth Adjustment via Gauge Wheel Position
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Solution Overview
Problem
Conventional agricultural planters lack effective systems for controlling and measuring the depth of the trench opened by the planter, leading to inconsistent seed planting depths due to soil conditions and insufficient down-pressure, which affects seed emergence and yield.
Innovation Solution
The implementation of a depth adjustment assembly with primary and secondary adjustment mechanisms, including actuators and rockers, to precisely control the trench depth by adjusting the position of gauge wheels relative to the frame, allowing for manual or automated adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional planters use only maximum depth adjustment apparatus, then device complexity is reduced, but manufacturing precision of trench depth is insufficient
Solution Approach 1:
The depth adjustment system is segmented into two independent subsystems: a primary depth adjustment assembly with a first adjustment mechanism for setting maximum depth, and a secondary depth adjustment assembly with a second adjustment mechanism for maintaining actual trench depth. This segmentation allows each mechanism to specialize in one aspect of depth control, improving overall precision without requiring a single complex system.
Solution Approach 2:
The patent implements dynamic depth control where the secondary adjustment mechanism actively responds to changing soil conditions and down-pressure variations during operation. The system transitions from static maximum depth setting to dynamic actual depth maintenance by continuously adjusting the trench depth based on real-time conditions, ensuring consistent planting depth despite operational variations.
2Manufacturing precision
If down-pressure on planter row unit is increased to maintain trench depth, then manufacturing precision improves, but device complexity and operational complexity increase
Solution Approach 1:
The patent introduces depth adjustment mechanisms as intermediary devices between the down-pressure force and the trench opening process. Rather than directly controlling down-pressure to achieve depth consistency, the adjustment mechanisms mediate the relationship by modifying the geometric configuration of the trench opening components, thereby maintaining depth precision without requiring complex down-pressure control systems.
3Adaptability or versatility
If soil conditions vary, then adaptability is improved, but trench depth consistency deteriorates
Solution Approach 1:
The dual adjustment mechanism system enables dynamic adaptation to varying soil conditions while maintaining trench depth consistency. The primary mechanism allows operators to set maximum depth based on overall field conditions, while the secondary mechanism dynamically compensates for local soil variations and down-pressure changes, ensuring consistent actual trench depth despite environmental variability.
4Measurement precision
If sensors are added to detect trench depth loss, then measurement capability is improved, but actual planting depth determination remains insufficient
Solution Approach 1:
The patent replaces sensor-based detection systems with a mechanical measurement system using a gauge wheel and circumference-based calculation. Instead of using electronic sensors that detect depth loss but cannot determine actual depth, the mechanical gauge wheel directly measures the rotational distance traveled, which corresponds to the actual trench depth through circumferential calculation, providing complete depth information without electronic components.
Data Source
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AI summary
Apparatus for adjusting the depth of a trench opened by a row unit (10) of an agricultural planter. The row unit (10) includes a trench depth adjustment assembly (90) configured to modify the trench depth. The trench depth adjustment assembly (90) includes a depth adjustment body (94) pivotally connected via a pivot (92) to a frame member (14) of the row unit (10). An electric motor (3030) is operable to cause rotation of a shaft (3034) operably coupled with the depth adjustment body (94), whereby rotation of the shaft (3034) causes the depth adjustment body (94) to pivotally move about the pivot (92) thereby changing a position of contact of the depth adjustment body (94) with a gauge wheel arm (54), thus changing the amount of upward travel of the gauge wheel (52) with respect to a trench opening disc (62) and thus the depth of the trench.