Harvester Sieve Clamping Assembly for Secure Alignment
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Solution Overview
Problem
Existing sieve assemblies in agricultural harvesters require manual adjustment of louvre spacing, which is time-consuming and inefficient, and lack a secure clamping mechanism for sieves, leading to potential misalignment and reduced cleaning efficiency.
Innovation Solution
A sieve assembly with a clamping mechanism using angled surfaces and pivoting bolts to securely attach sieves to a cleaning shoe, allowing for easy adjustment of louvre spacing and maintaining proper alignment during operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If manual adjustment of louvre spacing is used, then the structure remains simple, but the operation becomes time-consuming and inefficient
Solution Approach 1:
The patent implements adjustable louvre spacing mechanisms that allow dynamic reconfiguration of the sieve structure during operation. The louvres can be moved between fixed positions to adjust spacing, transforming a static structure into a dynamic one that adapts to different cleaning requirements, thereby improving productivity without excessive complexity
Solution Approach 2:
The sieve structure is divided into modular sections with individual louvres that can be independently adjusted. This segmentation allows for precise control of spacing between fingers while maintaining the overall structural integrity, enabling efficient adjustment through discrete, manageable components rather than complex continuous mechanisms
2Reliability
If no secure clamping mechanism is used, then the device complexity is reduced, but the sieve alignment becomes unstable and cleaning efficiency decreases
Solution Approach 1:
The clamping mechanism is pre-configured with angled surfaces and pivot points that automatically guide the sieve into proper alignment during the clamping process. This preliminary positioning action ensures correct alignment is achieved before final securing, eliminating the need for complex adjustment mechanisms while maintaining high reliability
Solution Approach 2:
Angled intermediate surfaces are introduced between the clamping bolts and the sieve structure. These intermediary surfaces facilitate smooth engagement and automatic alignment of the sieve during clamping, reducing the complexity of the overall mechanism while ensuring stable and reliable positioning
3Manufacturing precision
If angled surfaces with pivoting bolts are used for clamping, then the sieve attachment becomes secure and aligned, but the manufacturing complexity increases
Solution Approach 1:
Pivoting bolts with spherical or rounded features are used to engage with corresponding curved surfaces in the cleaning shoe. This curvature allows for automatic self-alignment during assembly, achieving high manufacturing precision through tolerance compensation rather than requiring extremely tight tolerances, thereby easing the manufacturing process
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) defining at least one second angled surface (124). The cleaning shoe (101) includes at least one first engagement surface (130) for engaging the at least one first angled surface (122), and a pair of bolts (134), with each of the bolts (134) being pivotally attached relative to a respective one of the side rails (103) and engageable with a respective second angled surface (124). Each of the bolts (134) has a longitudinal axis that is positioned at an acute angle (β) relative to the side rails (103) of the cleaning shoe (101) and biases the at least one first angled surface (122) into engagement with the at least one first engagement surface (130) when the bolts (134) are tightened against a respective second angled surface (124).