Straw Distribution System for Wide Header Harvesters
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Solution Overview
Problem
Current straw spreaders face difficulties in evenly spreading straw across the wide headers of combine harvesters, especially in adverse weather conditions, and are unable to effectively manage the increased width of modern 18 m headers.
Innovation Solution
A straw processing system with a distribution system that diverts the straw feed stream into multiple divergent paths using a chamber with multiple outlets and adjustable guide surfaces, combined with vacuum sources and chutes to ensure even distribution across the width, and a straw chopper with shredder rotors to chop the straw into manageable pieces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If current straw spreaders are used, then the system is simple and easy to operate, but the straw cannot be spread evenly across wide headers (up to 18 m) especially in adverse weather conditions
Solution Approach 1:
The distribution system is divided into multiple independent outlets (first outlet, second outlet, third outlet, fourth outlet, and central outlet) that can operate semi-independently. Each outlet handles a specific fraction of the straw stream and directs it in a specific direction, allowing the system to cover the entire 18 m width more evenly while maintaining manageable complexity through modular design
Solution Approach 2:
The distribution system incorporates adjustable guide surfaces and movable outlets that can be repositioned to optimize straw distribution patterns. This dynamic capability allows the system to adapt to different weather conditions and header widths, maintaining even spread across varying operational parameters without requiring a completely different system design
2Productivity
If the header width is increased to 18 m, then the harvesting productivity is improved, but the current spreading technology cannot achieve even distribution across the increased width
Solution Approach 1:
The 18 m width is divided into multiple discharge zones corresponding to different outlets positioned at specific locations (first outlet for left side, second outlet for right side, third and fourth outlets for intermediate zones, and central outlet for center zone). This segmentation allows each outlet to manage a manageable portion of the total width, achieving even distribution across the entire 18 m span while maintaining high productivity
Solution Approach 2:
The system transitions from a single-dimensional linear distribution approach to a multi-dimensional distribution pattern by incorporating outlets at different positions and angles. The divergent directions of different outlets create a three-dimensional distribution pattern that effectively covers the entire 18 m width, allowing the system to handle increased header width while maintaining uniform straw distribution
3Adaptability or versatility
If a single straw stream is used, then the system is simple, but the straw cannot be distributed evenly across wide areas in all weather conditions
Solution Approach 1:
The single straw stream is divided into multiple fractions that are directed to different outlets (first outlet, second outlet, third outlet, fourth outlet, and central outlet). Each outlet can be independently adjusted to compensate for weather-related variations in straw flow characteristics, allowing the system to maintain even distribution across wide areas in various weather conditions while keeping the overall structure relatively simple
Solution Approach 2:
The distribution system with multiple outlets serves multiple functions: it can handle different header widths, adapt to various weather conditions, and distribute straw evenly across the entire width. This multi-functionality is achieved through a unified chamber structure with multiple outlets that can be adjusted to meet different operational requirements, providing versatility without proportionally increasing complexity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system achieves an even spread of straw across up to 18 m widths, improving efficiency and adaptability in various weather conditions by creating divergent straw streams that are accelerated by vacuum sources for uniform distribution.
Implementation Method 1
vacuum sources one of each in fluid communication with respective outlets, wherein the vacuum sources are operable to draw a fraction of straw associated with the outlet to a discharge point
Data Source
AI summary
A straw processing system includes a straw pickup assembly, a straw chopper, and a straw distribution system. The straw pickup assembly picks up straw and passes it to the straw chopper for producing a straw feed stream flowing in a feed direction. The straw distribution system has a chamber with a feed inlet for receiving the straw feed stream, a central outlet, and at least a first outlet. The straw distribution system diverts at least a first fraction of straw from the straw feed into the first outlet in a first direction which is divergent from the feed direction. The central outlet discharges a fraction of the straw feed stream that continues to flow in the feed direction.