Agricultural Harvester Cutter Bar with Segmented Reciprocating Knives
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Solution Overview
Problem
The existing split blade systems in agricultural harvesters often result in non-shearing areas where crop material encounters a blade with no cutting action, leading to inefficiencies in crop cutting.
Innovation Solution
A multi-knife section cutter bar arrangement is introduced, featuring reciprocating knife sections that overlap a stationary knife section, ensuring a shearing action even with gaps between adjacent blades, and minimizing blade collision through coordinated movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a split blade system is used to reduce blade width and improve maneuverability, then the cutter bar can navigate tighter spaces, but non-shearing areas are created where crop material encounters blades with no cutting action
Solution Approach 1:
The blade is divided into multiple segments (first blade segment, second blade segment, third blade segment) arranged in a sequence. Each segment functions as an independent cutting element, ensuring that crop material encountered in any area of the cutter bar width experiences shearing action from at least one blade segment, thereby eliminating non-shearing areas while maintaining the compact segmented structure for maneuverability.
2Ease of operation
If reciprocating blades are used to achieve cutting action, then cutting functionality is provided, but blade collisions occur reducing reliability
Solution Approach 1:
The blade segments are configured with specific geometric relationships where the first blade segment reciprocates in a first plane, the second blade segment reciprocates in a second plane, and the third blade segment reciprocates in a third plane. The angles between these planes are specifically designed to ensure that the segments pass through each other's paths during reciprocation without collision, while still maintaining effective shearing action on crop material.
3Ease of manufacture
If gaps are introduced between adjacent blades to reduce complexity, then manufacturing is simplified, but non-shearing areas are created leading to poor crop cutting
Solution Approach 1:
Instead of arranging all blade segments in a single plane with overlapping paths, the invention utilizes three-dimensional spatial arrangement by reciprocating blade segments in different planes. The first, second, and third blade segments operate in respective planes at specific angles to each other, creating a three-dimensional cutting pattern that eliminates non-shearing areas while allowing gaps between segments for easier manufacturing and assembly.
Data Source
Figure 1
Figure 2~3
AI summary
A header (18) for use by an agricultural harvester (10). The header (18) includes a cutter bar (34) that cuts the crop material and includes a stationary knife section (72) and a plurality of reciprocating knife sections (74, 76, 78, 80) extending along a portion of the stationary knife section (72). A substantial part of the length of the reciprocating knife sections (74, 76, 78, 80) do not extend along any portion of the stationary knife section (72).