Draper Header Multi-Sided Barrier Interface for Crop Infiltration
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Solution Overview
Problem
Existing draper headers face issues with cut crop and material infiltration between the cutter bar and draper canvas, leading to increased friction and wear, as well as premature degradation of components due to single-sided seal arrangements that fail over time.
Innovation Solution
A multiple-sided barrier interface is created between the cutter bar and draper canvas, comprising a resilient strip with angularly related barrier elements that form a three-sided enclosure, requiring cut crop and material to change direction and pass through multiple interfaces, minimizing contact and friction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single-sided seal arrangement is used between the cutter bar and draper canvas, then the structure is simple, but cut crop and material infiltration occurs leading to increased friction and wear
Solution Approach 1:
The seal is divided into multiple independent barrier elements (first barrier element extending from cutter bar, second barrier element extending from draper canvas, and third barrier element forming a lower barrier) that work together to create a multi-sided enclosure. This segmentation allows each element to perform a specific sealing function while collectively preventing material infiltration more effectively than a single seal arrangement.
Solution Approach 2:
The seal arrangement transitions from a single-sided linear seal to a multi-sided three-dimensional enclosure. The barrier elements extend in multiple directions (laterally, vertically, and longitudinally) to create a volumetric barrier that blocks material infiltration from multiple angles, adding spatial dimensions to the sealing function.
2Reliability
If the draper canvas contacts the cutter bar extensively, then sealing is improved, but friction and wear increase
Solution Approach 1:
The sealing function is extracted from continuous surface contact between the draper canvas and cutter bar. Instead of relying on extensive friction-based sealing, the invention uses discrete barrier elements that block material paths without requiring sustained contact, thereby separating the sealing function from the friction-generating contact mechanism.
Solution Approach 2:
The resilient strip acts as an intermediary element between the cutter bar and draper canvas. It provides the necessary sealing contact while its resilient properties allow it to deform and recover, reducing permanent wear on both the strip and the draper canvas while maintaining effective material exclusion.
3Reliability
If a thicker fabric sealing strip is used, then sealing is improved, but friction and wear on the strip increase
Solution Approach 1:
The sealing strip is made resilient rather than thick and rigid, changing the local material quality from mass-based sealing to elasticity-based sealing. This resilient property allows the strip to maintain effective contact with barrier elements while reducing friction and wear through elastic deformation rather than rigid sliding contact.
Data Source
AI summary
The draper canvas of the header includes a strip of a resilient material that stands outwardly and forwardly of a front edge thereof and has an outer barrier surface, an inner barrier surface, and a front barrier surface received and contained in structure of a cutter bar and a front draper support plate having a plurality of barrier elements in face-to-face closely spaced relation with the barrier surfaces to form a multiple sided barrier interface between the cutter bar and draper fabric for excluding cut crop from the interior of the header. The strip runs within the container structure with minimal contact to reduce friction and wear.