Straw Beater Fan for Residue Flow Blockage
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Solution Overview
Problem
The formation of vortices in the flow of airborne non-grain crop material (MOG) between the straw beater and subsequent residue treatment devices in agricultural harvesters leads to clogging issues, particularly during low throughput operations.
Innovation Solution
Incorporating a wind generating system, such as axial or centrifugal fans, at the end of the straw beater to direct air flow towards the subsequent residue treatment device, preventing vortex formation by ensuring smooth airflow and material transport.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the combine operates at low throughput, then energy consumption is reduced, but vortex formation occurs in the residue handling system causing clogging
Solution Approach 1:
The patent applies a variable speed drive system to the straw beater, allowing its rotational speed to be dynamically adjusted based on throughput conditions. At low throughput, the straw beater speed is reduced to prevent vortex formation and clogging, while at high throughput, speed is increased to maintain effective residue handling. This dynamic adjustment resolves the contradiction between energy conservation and reliable residue flow.
Solution Approach 2:
The patent changes the operational parameters of the straw beater by varying its rotational speed according to throughput conditions. This parameter change allows the system to adapt to different operating conditions, preventing vortex formation at low throughput while maintaining effective residue handling at high throughput, thus resolving the contradiction between energy loss and residue flow reliability.
2Productivity
If the straw beater operates at high speed, then residue handling effectiveness is improved, but energy consumption increases
Solution Approach 1:
The variable speed drive system allows the straw beater to operate at high speed only when necessary for effective residue handling, and at reduced speed during low throughput operations. This dynamic speed adjustment optimizes the balance between residue handling effectiveness and energy consumption, resolving the contradiction between productivity and energy use.
Solution Approach 2:
By changing the rotational speed parameter of the straw beater based on operational requirements, the system achieves high residue handling effectiveness when needed while minimizing energy consumption during low throughput, thus resolving the contradiction between productivity and energy consumption.
3Reliability
If additional wind generating systems are added to prevent vortex formation, then residue flow reliability is improved, but device complexity increases
Solution Approach 1:
The patent makes the straw beater perform multiple functions: it not only processes residue material but also generates airflow to prevent vortex formation and clogging. This multi-functionality eliminates the need for separate wind generating systems, thereby improving residue flow reliability without significantly increasing device complexity.
Solution Approach 2:
The patent combines the residue processing function and the airflow generation function into a single straw beater unit. By merging these functions, the system improves residue flow reliability through vortex prevention while avoiding the added complexity of separate wind generating systems.
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
Prevents vortex formation and associated clogging, ensuring smooth movement of MOG and residue through the residue handling system under all operating conditions, improving material flow and reducing operational inefficiencies.
Implementation Method 1
at least one wind generating system, which may be at least one axial fan, at least one centrifugal fan, or at least one compressed air source, is provided at the end(s) of the straw beater
Implementation Method 2
the wind generating system is configured to generate and direct a flow of air from the vicinity of the straw beater to the subsequent residue treatment device, and such that said flow of air is directed by said at least one wind generating system and by vanes or nozzles to pass substantially through an upper rearward part of the residue handling system
Data Source
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AI summary
An agricultural harvester (10) has a residue handling system (70) including a straw beater (90) for receiving material other than grain from a threshing and separating system (24). A subsequent residue treatment device (72) receives the material from the straw beater (90) and breaks down larger parts of the material prior to discharge from the agricultural harvester (10). At least one wind generating system (92) is located at an end of the straw beater (90) and directs a flow of air (80) from the vicinity of the straw beater (90) to the subsequent residue treatment device (72). The flow of air (80) is directed to pass substantially through an upper rearward part of the residue handling system (70). The flow of air (80) operates to further entrain, render airborne, and transport material other than grain proceeding from the straw beater (90) to the subsequent residue treatment device (72).