Offset Knife Set for Stalk Residue Harvesting
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Solution Overview
Problem
Current row-crop harvesting headers do not efficiently harvest stalk residue along with corn ears, requiring separate operations to collect and process the residue, which can result in residue impacting the ground instead of being directed to a baler for further processing.
Innovation Solution
A row-crop harvesting header with transversely spaced row units, gathering mechanisms, snap rolls, and a knife set with offset cutting protrusions that cut stalks within a passageway, allowing for efficient collection of stalk residue while preventing hair pinning and ensuring continuous cutting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a traditional combine harvester is used to sever stalks from the ground, then corn ears can be harvested, but stalk residue is left on the ground requiring separate collection operations
Solution Approach 1:
The patent combines the corn ear harvesting function with the stalk residue collection function into a single integrated header unit. The knife set cuts stalks while the gathering mechanism simultaneously collects both ears and stalks into the same passageway, eliminating the need for separate collection operations and reducing time loss.
Solution Approach 2:
The header unit is designed to perform multiple functions simultaneously: harvesting corn ears, cutting stalks, and gathering both materials through the same passageway system. This multi-functional design allows the equipment to handle both grain and residue collection in one operation, improving overall productivity.
2Quantity of substance
If stalks are cut close to the ground, then more residue is available for baling, but hair pinning occurs blocking the passageway
Solution Approach 1:
The knife set is designed with asymmetric cutting protrusions where one blade extends further into the passageway than the other. This asymmetric configuration allows the knives to cut stalks close to the ground for maximum residue collection while the offset positioning prevents the cut material from pinning and blocking the passageway.
Solution Approach 2:
The knife set consists of multiple discrete cutting protrusions rather than a single continuous blade. This segmentation allows the cutting action to occur at multiple points along the passageway, enabling close ground cutting while maintaining open pathways for material flow and preventing hair pinning.
3Ease of operation
If gathering chains are used to convey crop material, then ears are transported to the cross auger, but stalk residue is not effectively collected for the baler
Solution Approach 1:
Instead of using gathering chains to convey material forward to the cross auger, the patent inverts the approach by using snap rolls to pull stalks downward through a passageway toward the rear of the header. This inverted conveyance direction directs both ears and stalks toward the baler pickup, significantly improving residue collection efficiency.
Data Source
AI summary
A harvesting header for a row crop machine has a plurality of row units having fore-and-aft extending arms forming a passageway, a gathering mechanism to gather stalks into the passageway, snap rolls to pull the stalks downwardly through the passageway, and a knife set to cut the stalks in the passageway. The knife set includes a pair of opposing blades, each blade having a main portion with an inner edge located on a first side of a centerline of the passageway and a cutting protrusion with a sharpened cutting edge extending across the centerline toward the opposing blade. The cutting protrusions are offset longitudinally from one another such that the cutting protrusion of one of the blades is a different distance from a mouth of the passageway than the cutting protrusion of the opposing blade such that there is a continuous gap between the blades along the length of blades.