Combine Grain Cleaning Sieve With Progressive Louver Adjustment
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Solution Overview
Problem
Existing agricultural combine sieves struggle to achieve optimal grain loss levels by allowing either excessive MOG passage or reduced grain throughput due to uniform louver spacing and angular orientation, which is inadequate for varying grain sizes and conditions.
Innovation Solution
A sieve with independently rotatable louvers, where subsets of louvers can pivot differently along the sieve length to adjust opening sizes progressively, allowing grain passage while preventing MOG, using sensors and motors for independent control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If uniform louver spacing and angular orientation are used, then the sieve structure is simple, but the grain separation efficiency is reduced due to inability to adapt to varying grain sizes and conditions
Solution Approach 1:
The sieve is divided into multiple sections along its length, with each section having independently adjustable louvers. This segmentation allows different portions of the sieve to be optimized for different grain sizes and conditions, enabling adaptation without requiring complete redesign of the entire sieve structure.
Solution Approach 2:
The louvers are made dynamically adjustable through independent rotation mechanisms for each louver or louver group. This allows the sieve to adapt its opening size and angular orientation in real-time based on grain conditions, transforming a static structure into a dynamic one that can respond to varying requirements.
2Productivity
If larger opening size is used to increase grain throughput, then more grain passes through the sieve, but excessive MOG (material other than grain) is allowed to pass through
Solution Approach 1:
Different sections of the sieve are equipped with louvers that can be independently adjusted to have different opening sizes. This allows the upstream sections to have larger openings for high grain throughput while downstream sections maintain smaller openings for precise MOG separation, enabling both high productivity and high separation precision simultaneously.
3Manufacturing precision
If smaller opening size is used to prevent MOG passage, then grain separation precision is improved, but grain throughput is reduced
Solution Approach 1:
The sieve structure is segmented into multiple sections with independently adjustable louvers, allowing the system to optimize for both precision and throughput by configuring different sections appropriately rather than using a single uniform opening size throughout.
4Adaptability or versatility
If manually or automatically movable adjustors are used to change louver angular orientation, then the sieve can be customized for particular grain sizes, but the device complexity and control system complexity increase
Solution Approach 1:
The louver adjustment mechanism is designed to be self-contained and self-adjusting, with each louver or louver group having its own independent adjustment capability. This self-service approach reduces the need for complex external linkage and cable arrangements, simplifying the overall control system while maintaining customization capability.
Data Source
AI summary
A progressive sieve assembly for an agricultural vehicle includes a sieve having a frame, a first subset of louvers that are pivotably connected to the frame, and a second subset of louvers that are also pivotably connected to the frame. The second subset of louvers are positioned downstream of the first subset of louvers as viewed in a direction of travel of grain across the sieve assembly. The first subset of louvers are configured to pivot independently of the second subset of louvers, and the second subset of louvers are configured to pivot independently of the first subset of louvers.