Weed Seed Harvester Control via Dynamic Screening and Air Classification
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Solution Overview
Problem
Current methods for controlling weeds during harvesting, such as chemical application and tillage, are expensive and harmful, and weed seeds often escape to propagate in subsequent growing seasons, reducing crop yield.
Innovation Solution
A harvester system equipped with a controller that adjusts working members based on real-time data about forthcoming weed seeds, using sensors and preharvest maps to dynamically manage weed seed interaction, including screening, air flow, chopping, and discharge, to optimize weed seed handling and reduce energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If chemical application and tillage are used to control weeds, then weed growth is suppressed, but cost and environmental harm increase
Solution Approach 1:
The patent extracts and removes weed seeds from the harvested grain stream using screening mechanisms and air classifiers, separating them physically from the crop before discharge. This eliminates the need for chemical weed control by directly removing the propagative element (weed seeds) from the system.
Solution Approach 2:
The system converts the harmful effect of weed seeds being discharged with grain into a beneficial separation process. By using air classifiers and screens, the harmful weed seeds are identified and removed, while the grain is preserved. The air classification process uses air flow to separate lighter weed seeds from heavier grain particles, turning a potential harm into a controlled separation benefit.
2Productivity
If working members operate continuously at high capacity, then harvesting speed increases, but energy consumption increases
Solution Approach 1:
The patent implements dynamic control of working members based on real-time detection of weed seed presence and density. The controller adjusts the operation of screens, air classifiers, and choppers dynamically - increasing their activity when weed seeds are detected and reducing or stopping them when weed seed density is low. This dynamic adaptation allows the system to maintain high harvesting speed while consuming energy only when necessary for weed seed removal.
Solution Approach 2:
The system changes operational parameters of working members based on detected conditions. The controller modifies air flow rates, screen rotation speeds, and chopper engagement based on real-time weed seed detection data. These parameter changes allow the system to optimize energy consumption by matching working member intensity to actual weed seed presence rather than operating at constant high capacity.
3Productivity
If weed seeds are not removed during harvesting, then harvesting efficiency is maintained, but weed seed dispersal increases
Solution Approach 1:
The patent implements preliminary action by detecting and removing weed seeds during the harvesting process itself, before the grain and weed seeds are discharged to the field. The screening and air classification occur while the crop is being processed, preventing weed seed dispersal at the source without requiring separate post-harvest weed control operations.
Solution Approach 2:
The system introduces intermediary mechanisms (screens, air classifiers, choppers) between the harvesting process and field discharge. These intermediaries capture and remove weed seeds from the grain stream, acting as a barrier that prevents weed seed dispersal while allowing grain to proceed to storage. The air classifier serves as an intermediary that uses air flow to separate and remove weed seeds before they can be dispersed.
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 effectively adapts to varying weed densities, improving harvester throughput and reducing weed seed dispersal, thereby enhancing crop yield and minimizing environmental impact.
Implementation Method 1
an air classifier to receive the combined material and separate weed seeds from the combined material
Data Source
AI summary
A harvester may include a crop path along which crops are moved, a working member to interact with weed seeds moving along the crop path and a controller. The controller is to receive data indicating forthcoming weed seeds and is to output control signals controlling the working member based on the data.