Adjustable Draper Seal for Harvester Header Gap Sealing
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Solution Overview
Problem
Agricultural harvesters often lose crop material due to gaps between the upper cutter bar plate and the draper belt, as existing header frames are rarely straight, leading to inconsistent sealing and crop material accumulation.
Innovation Solution
A draper seal is attached to the draper frame, with multiple perpendicular portions that surround the bead seal, ensuring a consistent clearance along the draper deck and allowing vertical adjustment to accommodate manufacturing variances, thus sealing the gap between the draper belt and the header frame effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If a traditional header frame with upper cutter bar plate is used, then the structure is simple, but gaps exist between the cutter bar plate and draper belt causing crop material loss
Solution Approach 1:
The seal assembly is divided into multiple segments including a first seal portion, second seal portion, third seal portion, and fourth seal portion that can independently contact the draper belt. This segmentation allows each portion to adapt to local variations in the draper belt position while maintaining overall sealing effectiveness, thereby reducing crop material loss without requiring complete structural redesign
Solution Approach 2:
The seal assembly acts as an intermediary component between the upper cutter bar plate and the draper belt. It fills the gap that naturally exists due to manufacturing tolerances and frame non-straightness, preventing crop material from passing through while maintaining the simplicity of the original header structure
2Loss of substance
If the header frame is made perfectly straight to eliminate gaps, then crop material loss is reduced, but manufacturing precision requirements increase significantly
Solution Approach 1:
The seal assembly incorporates vertical movement capability through guide slots and adjustable mounting mechanisms. This allows the seal portions to dynamically adjust their vertical position to maintain contact with the draper belt even when the header frame is not perfectly straight, eliminating the need for high manufacturing precision while preventing crop material loss
Solution Approach 2:
The seal assembly allows for adjustment of vertical position parameters to compensate for frame non-straightness. By making the seal height adjustable rather than fixed, the system can adapt to variations in draper belt position caused by manufacturing tolerances, thereby reducing crop material loss without requiring perfect frame straightness
3Reliability
If a fixed seal is used between cutter bar plate and draper belt, then sealing is provided, but the seal cannot accommodate manufacturing variances and crop material still accumulates
Solution Approach 1:
The seal assembly transitions from a fixed seal design to a dynamic design where seal portions can move vertically within guide slots. This dynamic capability allows the seal to adapt to manufacturing variances in draper belt position while maintaining reliable sealing contact, preventing both crop material loss and accumulation
Solution Approach 2:
The seal is segmented into multiple independent portions that can adjust vertically to accommodate local variations in draper belt position. This segmentation provides both reliability through continuous sealing contact and adaptability through independent adjustment of each seal portion, eliminating the trade-off between fixed sealing and variance accommodation
Data Source
Figure 1
Figure 2
AI summary
A header for an agricultural harvester including a draper frame. A conveyor having a fore end and an aft end is supported by the draper frame and a draper seal is adjustably attached to the draper frame adjacent the fore end of the conveyor. The draper seal covers a bead seal at the fore end of the conveyor and extends substantially along the width of the fore end of the conveyor. The draper seal includes a first portion attached to the draper frame, a second portion extending forwardly from the first portion, a third portion extending upwardly from the second portion, and a fourth portion extending rearwardly from the third portion. The second, third and fourth portions surround and cover the conveyor bead seal.