Spring-Assisted Translatable Drive Roller for Draper Belt Alignment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Agricultural harvesting machines with draper platforms face long-term stress issues on belts due to diagonal stresses caused by flexing during field traversal, leading to potential misalignment and reduced operational efficiency.
Innovation Solution
The implementation of translatable drive rollers along their rotational axis, combined with a spring assembly to yieldably urge the rollers aft, alleviates diagonal stresses on the endless belt, ensuring extended operation without misalignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the drive roller is made translatable along its rotational axis to alleviate diagonal stresses on the belt, then the belt misalignment is reduced, but the device complexity increases due to the need for translation mechanisms and spring assemblies
Solution Approach 1:
The drive roller is designed to be translatable along its rotational axis rather than fixed, allowing it to dynamically adjust its position to accommodate belt flexure and diagonal stresses. This dynamic capability prevents misalignment while maintaining operational reliability.
Solution Approach 2:
The roller's position parameter (axial translation) is changed to accommodate varying operational conditions. The spring assembly provides a yieldable urging force that adjusts the roller's position based on the magnitude of diagonal stresses, effectively managing belt alignment through parameter variation.
2Productivity
If the float arm pivot point is positioned close to the field surface to reduce draft loads, then harvesting efficiency is improved, but diagonal stresses on the belt increase causing misalignment
Solution Approach 1:
The drive roller's translatable design allows it to dynamically compensate for the diagonal stresses induced by the float arm configuration. This enables the system to maintain belt alignment even when the pivot point is positioned low to reduce draft loads and improve harvesting efficiency.
Solution Approach 2:
The diagonal stresses caused by the float arm pivot configuration, which initially cause misalignment, are converted into a beneficial effect by using the spring assembly to yieldably urge the roller in the opposite direction. The stress that causes the problem is effectively used to drive the corrective action.
3Duration of action of stationary object
If a spring assembly is added to yieldably urge the drive roller aft, then long-term belt stress is alleviated, but the device complexity and manufacturing cost increase
Solution Approach 1:
The spring assembly provides self-regulating compensation for belt stress without requiring external control systems. The spring automatically adjusts the roller position based on operational conditions, enabling extended operational duration while managing complexity through a simple passive mechanism.
Solution Approach 2:
The spring assembly provides beforehand cushioning by continuously opposing the diagonal stresses before they can cause misalignment. This preventive approach extends the operational duration by maintaining belt alignment throughout extended use.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution effectively minimizes belt misalignment and maintains efficient operation over time by accommodating belt flexure and reducing draft loads, enhancing the harvesting capacity and reliability of agricultural machines.
Implementation Method 1
A spring assembly is provided which urges the carriage in an aft direction. The spring assembly includes a spring which urges the carriage in an aft direction.
Implementation Method 2
the drive rollers are acted on by gravity to move to a forward position
Data Source
Figure 1
Figure 2
Figure 3
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 (32) are guided by a drive rollers and idler rollers. The idler roller for each belt (32) 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. A spring assembly (98) is positioned on a frame (26) for the machine and acts to yieldably urge the drive rollers (70) in an aft condition to alleviate stresses for an extended period of operation.