Rotatable Hood Assembly for Agricultural Harvester Spreader
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Solution Overview
Problem
Current combine harvesters are ineffective in spreading and windrowing agricultural materials such as straw and chaff, often resulting in uneven distribution and interference between different materials during the harvesting process.
Innovation Solution
A spreader system for agricultural harvesters that includes a hood assembly and door mechanism to control airflow and material flow, allowing for separate and efficient distribution of chaff and straw, with the hood assembly blocking upward airflow and redirecting straw to create windrows while spreading chaff laterally, and the door adjusting positions to facilitate either spreading or windrowing based on operator needs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a single distribution blower is used to discharge agricultural materials, then the device complexity is reduced, but the manufacturing precision of material distribution becomes insufficient
Solution Approach 1:
The distribution system is segmented into two separate distribution blowers (first distribution blower and second distribution blower) positioned at different locations. Each blower handles specific agricultural materials (straw and chaff respectively) to achieve precise and uniform distribution across the field, resolving the contradiction by dividing the distribution function into specialized segments rather than using a single general-purpose blower
2Adaptability or versatility
If shields are made stationary, then the device complexity is reduced, but the adaptability of distribution patterns becomes insufficient
Solution Approach 1:
The shields are designed as rotatable components that can be dynamically adjusted to different angular positions. The first shield and second shield can independently rotate to create various distribution patterns (e.g., concentrated, dispersed, directional), allowing the system to adapt to different field conditions and material types without increasing overall system complexity
3Manufacturing precision
If chaff and straw are discharged together without separation, then the device complexity is reduced, but the manufacturing precision of material placement becomes insufficient
Solution Approach 1:
The discharge system is segmented into separate discharge paths for chaff and straw. The first distribution blower discharges chaff through a first outlet while the second distribution blower discharges straw through a second outlet. This segmentation allows precise placement of each material type in different locations on the field, preventing mixing and enabling targeted distribution according to agricultural requirements
4Adaptability or versatility
If the spreader system uses fixed discharge positions, then the device complexity is reduced, but the adaptability to different field conditions becomes insufficient
Solution Approach 1:
The discharge positions are made dynamic through rotatable shields that can be adjusted to different angular positions. The first shield and second shield can be independently positioned to direct materials to various locations behind the harvester, allowing adaptation to different field widths, crop types, and weather conditions without requiring multiple fixed discharge stations
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 ensures effective spreading and windrowing of agricultural materials, maintaining separation between chaff and straw, and allowing for adjustable distribution patterns to suit different harvesting requirements, enhancing the efficiency of material decomposition or collection processes.
Implementation Method 1
the hood assembly blocking an upward airflow generated by the spreader discs and redirecting the airflow rearward
Implementation Method 2
spreader discs rotating within a hub, with the spreader discs distributing the chaff laterally
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
A spreader system (12) for an agricultural harvester (10), including a first spreader disc (42) and a second spreader disc (88). The first (42) spreader disc and second spreader disc (88) have at least one paddle (46, 90) and are configured to receive a first agricultural material, a second agricultural material, or a combination thereof, and to distribute the first agricultural material, the second agricultural material, or the combination thereof, throughout a field. The spreader system (12) is characterized by a hood assembly (30) including a rotatable first hood (48, 84, 120) and a rotatable second hood (49, 85, 122). The first hood (48, 84, 120) and second hood (49, 85, 122) cover a portion of a respective first disc (42) and second disc (88) and are configured to rotate between a first position and a second position. In the first position the first hood (48, 84, 120) and second hood (49, 85, 122) block upward and rearward flow of a first agricultural material, a second agricultural material, an airflow, or a combination thereof. In the second position the first hood (48, 84, 120) and second hood (49, 85, 122) are configured to facilitate upward and rearward flow of the first agricultural material, the second agricultural material, the airflow, or the combination thereof.