Belt Routing Mechanism for Round Baler Bale Core Formation
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Solution Overview
Problem
Existing round balers face challenges in maintaining proper belt tension and tracking, leading to uneven bale formation and increased crop wastage due to aggressive belt surfaces and asymmetric bale chamber shapes.
Innovation Solution
The design includes a belt tensioning apparatus with a pivotally connected tension arm positioned above the bale forming chamber, featuring first and second tension rolls aligned parallel to each other, and guide rolls positioned to minimize unguided belt spans, ensuring optimal bale core formation and reduced crop wastage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the belts span between two guide rolls to define the bale chamber, then the bale chamber can be formed, but the unguided belt span becomes long causing poor belt tracking
Solution Approach 1:
The single long unguided belt span is segmented into multiple shorter spans by introducing additional guide rolls (first and second lower guide rolls, first and second forward guide rolls) that divide the belt path into manageable sections, each properly supported and guided
Solution Approach 2:
Additional guide rolls are introduced as intermediary elements between the existing guide rolls to provide intermediate support and guidance points for the belts, reducing the length of unguided spans and improving belt tracking stability
2Manufacturing precision
If aggressive belt surfaces are used to promote initial bale core formation, then bale formation is improved, but more crop material is pulled from the incoming crop mat resulting in increased wastage
Solution Approach 1:
Different belt surfaces are assigned different functions: the initial bale formation belts maintain aggressive surfaces for core formation, while subsequent belts have smoother surfaces that reduce crop material pull and wastage during later stages of bale formation
3Shape
If the bale chamber shape is asymmetric due to belts spanning between two guide rolls, then the chamber can be formed, but the shape is not optimal for efficient bale formation
Solution Approach 1:
The positions and configurations of the guide rolls are deliberately asymmetrically arranged to create an optimized bale chamber shape that improves bale formation efficiency, with guide rolls positioned at specific locations to achieve the desired chamber geometry
Data Source
Figure 1~2
Figure 3~4
AI summary
An improved mechanism for directing movement of a plurality of side-by-side belts (20) in a round baler wherein a bale chamber (18) is optimally configured for bale core formation thereby reducing the need for an aggressive surface on the belts to initiate rotation of the incoming crop material. As the bale (100) expands, the improved mechanism enables the unguided span (20a,20b) of belts (20) surrounding the periphery of the bale to be minimized by positioning intermediate guide rolls (44,45) generally equidistantly from idler rolls (41,42) bounding the belt guides defining the bale forming chamber. Further, the improved mechanism reduces the friction force between the crop and the belts necessary to initiate crop rolling for bale core formation enabling smooth-surfaced belts to be used which reduce trash generation.