Parallel Link Trailing Arm for Consistent Furrow Depth
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Solution Overview
Problem
Existing agricultural seeders face challenges in maintaining consistent seed and fertilizer furrow depths, especially in uneven terrain, leading to variations in furrow depth and reduced operating speeds due to the need to place furrow openers close to the packer wheel to minimize depth variations.
Innovation Solution
A parallel link trailing arm apparatus is used, where a front link is attached to a lateral frame member, and upper and lower parallel arm members are pivotally attached to maintain the rear link horizontal, allowing front and rear furrow openers to maintain consistent orientation with a depth-controlling packer wheel, enabling adjustable furrow depths and increased operating speeds by positioning furrow openers farther from the packer wheel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the furrow opener is positioned close to the packer wheel to minimize depth variations in uneven terrain, then furrow depth consistency is improved, but operating speed is reduced due to insufficient time for soil to fall back into the furrow before packing
Solution Approach 1:
The trailing arm is divided into multiple segments (first trailing arm portion, second trailing arm portion) connected by a pivot joint, allowing independent movement of each segment. This segmentation enables the furrow opener to be positioned farther from the packer wheel while maintaining depth control, as the pivot joint compensates for terrain variations.
Solution Approach 2:
The trailing arm system uses a pivot joint that allows dynamic adjustment of the angle between arm segments in response to terrain changes. This dynamic mechanism maintains furrow depth consistency even when the furrow opener is positioned at a greater distance from the packer wheel, enabling higher operating speeds.
2Productivity
If the trailing arm is positioned at a greater angle from vertical to increase operating speed, then furrow depth consistency deteriorates in uneven terrain
Solution Approach 1:
The pivot joint between trailing arm portions allows the system to dynamically adjust to maintain proper geometry. Even when the entire assembly is at a greater angle from vertical for speed, the pivot joint compensates for terrain variations to maintain furrow depth consistency.
Solution Approach 2:
The trailing arm system combines rigid arm portions with a flexible pivot joint connection. This composite structure provides both the stability needed for depth control and the flexibility to operate at various angles for improved speed.
3Device complexity
If a single trailing arm is used for both seed and fertilizer furrow openers, then device complexity is reduced, but the ability to independently control furrow depths is lost
Solution Approach 1:
The trailing arm is segmented into multiple portions that can be independently positioned. The first trailing arm portion supports the seed furrow opener while the second portion supports the fertilizer furrow opener, allowing independent depth control for each furrow type while using a single integrated trailing arm structure.
Solution Approach 2:
The single trailing arm structure serves multiple functions by supporting both seed and fertilizer furrow openers. The pivot joint mechanism provides universal adaptability, allowing each opener to be independently positioned for its specific depth requirements while sharing the common trailing arm support structure.
Data Source
AI summary
A furrow opener apparatus includes a parallel link trailing arm having a rear link that is maintained substantially horizontal as the arm moves up and down. Front and rear furrow openers are attached to the rear link. A packer wheel arm is attached to the rear link and extends rearward and downward from the rear link, and a packer wheel is mounted to the packer wheel arm and aligned with one of the furrow openers. A bias device exerts a downward bias force on the trailing arm, furrow openers, and packer wheel. The furrow openers, the packer wheel, and the rear link are maintained in rigid orientation with respect to each other when in a working mode, and a vertical operating position of at least one of the furrow openers with respect to the packer wheel is adjustable to vary a depth of the furrow.