Sieve Installation Arrangement in Agricultural Harvester Cleaning System
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Solution Overview
Problem
Existing agricultural harvester cleaning systems face challenges in securely mounting and adjusting sieves to optimize grain separation and airflow efficiency.
Innovation Solution
A sieve assembly with a sieve clamped against a cleaning shoe using an angled structure at the upstream end and a pivoting bolt arrangement at the downstream end, allowing for secure mounting and adjustable louvre spacing for optimal separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sieve is mounted in a cleaning shoe using traditional mounting methods, then the sieve can be installed, but the mounting is not secure and reliable enough for optimal grain separation
Solution Approach 1:
The mounting structure incorporates a pivoting bolt arrangement that allows dynamic adjustment of the sieve position and spacing. The bolt can pivot to accommodate different sieve positions while maintaining secure clamping, transforming a static mounting system into a dynamic one that adapts to operational requirements.
Solution Approach 2:
The mounting structure is divided into separate functional components: an angled clamping structure at the upstream end and a pivoting bolt arrangement at the downstream end. This segmentation allows each component to perform its specific function optimally while simplifying the overall design and maintenance.
2Adaptability or versatility
If louvre spacing is fixed in the sieve, then manufacturing is simplified, but the ability to adjust spacing for optimal separation of different grain and chaff sizes is lost
Solution Approach 1:
The sieve incorporates adjustable louvre spacing that can be modified during operation. The louvres are positioned on adjustable supports that can be moved along the sieve structure, allowing the spacing to be dynamically changed to match different grain and chaff size requirements.
Solution Approach 2:
The sieve is pre-manufactured with louvre supports at predetermined positions, but these supports can be repositioned before operation. This preliminary preparation simplifies manufacturing while maintaining adaptability, as the basic structure is ready-made but can be customized for specific operational needs.
3Productivity
If the sieve is tightly clamped to maximize separation efficiency, then grain separation improves, but airflow efficiency may be reduced
Solution Approach 1:
The clamping force applied to the sieve can be dynamically adjusted during operation. The mounting structure allows for variable clamping pressure, enabling optimization of the balance between separation efficiency and airflow efficiency based on operational conditions.
Solution Approach 2:
The distance between the sieve and cleaning shoe can be adjusted as a variable parameter. By changing this spacing parameter, the system can optimize both the separation efficiency (requiring closer spacing) and airflow efficiency (requiring adequate spacing), allowing adaptation to different operational requirements.
Data Source
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AI summary
A sieve assembly (100) for use in an agricultural harvester (10) includes a cleaning shoe (101) having a pair of opposed side rails (103), and a sieve (48, 50) which is removably installed within the cleaning shoe (101) at a selected location against the side rails (103). The sieve (48, 50) has an upstream end (120) defining at least one first angled surface (122), and a downstream end (118). The cleaning shoe (101) includes at least one first engagement surface (130) for engaging the at least one first angled surface (122), wherein the at least one first engagement surface (130) comprises a resilient surface (704) extending at least partially across the cleaning shoe (101) between the side rails (103), wherein the resilient surface (704) is configured to apply a force onto the first angled surface (122) of the sieve (48, 50) in order to retain the sieve (48, 50) in position.