Translatable Drive Roller for Draper Belt Alignment
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Solution Overview
Problem
Flexible draper belt assemblies in agricultural harvesting machines experience diagonal stresses and misalignment due to the flexing of float arms during field traversal, leading to increased load on the belt and potential plugging issues.
Innovation Solution
The implementation of translatable drive rollers along their axis, connected via pivoting links to float arms, alleviates diagonal stresses on the endless belt by allowing fore and aft movement, and the use of a carriage system with limited pivoting and sliding motions to maintain belt tension and alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If float arms are pivotally connected with the pivot point close to the field surface to reduce draft loads and improve crop collection, then harvesting efficiency is improved, but diagonal stresses and misalignment on the draper belt increase
Solution Approach 1:
The drive roller is made movable along the longitudinal axis of the belt instead of being fixed. This dynamic adjustment allows the roller to compensate for the diagonal stresses caused by float arm flexing, maintaining proper belt alignment while preserving the benefits of the low pivot-point float arm configuration for harvesting efficiency
Solution Approach 2:
The position of the drive roller along the longitudinal axis is changed dynamically in response to operational conditions. By adjusting this parameter, the system compensates for stress-induced misalignment while maintaining the optimized float arm geometry for reduced draft loads and effective crop collection
2Force
If the pivot point of float arms is positioned close to the field surface to reduce draft loads, then draft force is reduced, but diagonal stresses on the draper belt increase leading to misalignment
Solution Approach 1:
The movable drive roller acts as an intermediary element between the float arm and the belt. It absorbs and compensates for the diagonal stresses generated by the low pivot-point float arm configuration, allowing the system to maintain both reduced draft loads and proper belt alignment
Solution Approach 2:
The drive roller's ability to move longitudinally provides a dynamic response to the diagonal stresses. This movement compensates for the stress concentration caused by the optimized float arm pivot position, maintaining belt alignment without sacrificing draft load reduction
Data Source
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AI summary
An agricultural harvesting machine including a flexible cutterbar (22) and associated draper belts (32) for carrying cut agricultural material to a center location. The belts are guided by a drive rollers (70) and idler rollers. The idler roller for each belt is pivotable about an axis generally at 90 degrees to the axis of the belt and the drive roller for each belt is translatable axially to minimize diagonal stresses caused by flexing of the elongated endless belt.