Planter Closing Wheel with Interlocking Arches for Seed Coverage
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Solution Overview
Problem
Existing closing wheels in planters fail to provide adequate soil coverage for seeds, leading to poor seedling emergence and root formation due to inadequate width and material inefficiencies, resulting in low yield and high production costs.
Innovation Solution
A closing wheel assembly using a spiked wheel frame and shoulder frame formed by interlocking arch-shaped segments, with radial teeth to penetrate and displace soil, and a shoulder frame to cover seeds optimally, ensuring consistent germination and emergence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pressure is employed on the packing and/or closing wheels to compress and/or fracture the furrow sidewalls back, then the seed trench is closed and soil coverage is achieved, but the seedlings have inadequate soil coverage and difficulty pushing through dense soil layers, resulting in poor root formation
Solution Approach 1:
The closing wheel is divided into multiple functional segments: a spiked wheel frame for creating the seed trench, a shoulder frame for gentle soil displacement, and an inner rim shoulder for firming. This segmentation allows each component to perform its specific function without causing excessive compaction, resolving the contradiction between achieving coverage and avoiding harmful compaction.
Solution Approach 2:
Different parts of the closing wheel assembly have different structural properties tailored to their specific functions. The spiked wheel frame has aggressive teeth for trench creation, while the shoulder frame has a smoother profile for gentle soil displacement. This local differentiation ensures effective coverage without uniform compaction throughout the seed trench area.
2Reliability
If a steel closing wheel is made with adequate width to displace sufficient soil, then effective seed coverage is achieved, but the material cost increases due to cutting and machining requirements
Solution Approach 1:
The closing wheel assembly is segmented into multiple functional components (spiked wheel frame, shoulder frame, inner rim shoulder) that can be manufactured separately and assembled. This allows each segment to be optimized for its specific function without requiring a single large, material-intensive steel wheel, reducing overall material waste.
Solution Approach 2:
The closing wheel assembly uses composite construction with different materials for different components. The spiked wheel frame and shoulder frame can be made from different materials optimized for their specific functions, rather than using uniform steel throughout, reducing material waste and cost while maintaining performance.
3Ease of manufacture
If a rubber-tired or plastic closing wheel is used, then material cost is reduced and ease of manufacture is improved, but the wheel wears out easily and requires early replacement
Solution Approach 1:
The closing wheel assembly uses composite construction where the spiked wheel frame and shoulder frame can be made from different materials. This allows combining materials with different properties - some components can use durable materials for longevity while others use easier-to-manufacture materials, achieving both ease of manufacture and extended service life.
Solution Approach 2:
By segmenting the closing wheel into replaceable components, wear-prone parts can be replaced individually rather than replacing the entire wheel assembly. This extends the overall service life of the system while maintaining ease of manufacture for individual components.
4Reliability
If the closing wheel teeth have adequate width to displace sufficient soil, then effective seed trench closure is achieved, but the manufacturing complexity and cost increase due to cutting and finishing requirements
Solution Approach 1:
The closing wheel is segmented into multiple components that can be manufactured using simpler processes and then assembled. This reduces the manufacturing complexity of individual parts while achieving the same overall effectiveness in seed trench closure through the combined action of multiple segments.
Solution Approach 2:
Each segment of the closing wheel is designed with the specific local quality needed for its function. The spiked wheel frame has aggressive teeth for trench creation, while the shoulder frame has a smoother profile for gentle displacement. This localized optimization achieves effective closure without requiring complex manufacturing processes for the entire wheel.
Data Source
AI summary
A closing wheel assembly for a planter includes a spiked wheel frame and shoulder frame configured to securely mount onto a closing wheel hub. The spiked wheel frame includes a series of outwardly projected radial teeth configured to penetrate soil to form a seed trench. The spiked wheel frame is formed using a set of arch-shaped interlocking segments having a puzzle element and puzzle slot at its ends. Each puzzle element is configured to fit into the puzzle slot of the adjacent arch-shaped segment to form a circular loop. The shoulder frame evenly closes the seed trench formed by the spiked wheel frame as the closing wheel assembly rotates in the soil optimally covering the seed.