Crop Unloader Drive Tensioner for Consistent Belt Load

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Solution Overview

Problem

Existing agricultural unloader systems face challenges in maintaining consistent tension in their endless flexible drives during varying orientations and movements, which can lead to inefficiencies and potential damage.

Innovation Solution

The proposed crop unloader system incorporates an elevator assembly, a boom assembly, an endless flexible drive, and a tensioning assembly. The tensioning assembly, comprising a tensioner link, control link, and idler wheel, maintains the tension load on the endless flexible drive within a predetermined range throughout the range of motion of the boom frame relative to the elevator frame.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the unloader is made movable to different orientations, then the equipment becomes more maneuverable and can navigate through smaller spaces, but the tension in the endless flexible drive becomes inconsistent during varying orientations and movements

Engineering Contradiction:

Improvemovability of unloaderVSAvoidtension consistency of endless flexible drive

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The tensioning assembly is designed with movable components including a tensioning pulley that can shift position, a tensioning arm that can rotate, and a spring that can compress and extend. These dynamic elements automatically adjust to maintain consistent tension on the endless flexible drive regardless of the unloader's orientation or position changes

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The spring-based tensioning mechanism changes the physical state of the tensioning system by utilizing spring compression and extension to dynamically adjust tension parameters. This allows the system to compensate for varying orientations and movements while maintaining optimal tension levels in the endless flexible drive

Inventive Principle:

Principle #35Parameter changes

2Adaptability or versatility

If the unloader is made movable between stowed and operative positions, then the equipment becomes more maneuverable, but the endless flexible drive may become loose or overly tight during movement, leading to potential damage

Engineering Contradiction:

Improveposition adjustability of unloaderVSAvoidintegrity of endless flexible drive

Core Design Contradiction:

Adaptability or versatilityVSStrength

Solution Approach 1:

The spring element in the tensioning assembly is pre-loaded to provide continuous tension compensation before any damage can occur. This beforehand cushioning ensures that the endless flexible drive maintains proper tension throughout the full range of motion from stowed to operative positions, preventing loose conditions that could lead to derailment or damage

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

3Reliability

If a tensioning assembly is added to maintain consistent tension, then the reliability of the endless flexible drive is improved, but the device complexity increases

Engineering Contradiction:

Improvetension consistency of endless flexible driveVSAvoidstructure of tensioning assembly

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The tensioning assembly is designed as a self-regulating system where the spring automatically adjusts tension based on the unloader's position and orientation. The movable pulley and tensioning arm move passively with the system, requiring no external control or additional actuators, thus maintaining reliability while minimizing added complexity

Inventive Principle:

Principle #25Self-service

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 configuration ensures consistent and stable operation of the unloader system, maintaining optimal tension in the endless flexible drive across different positions and movements, thereby enhancing efficiency and reducing the risk of damage.

Implementation Method 1

an idler wheel operatively connected to the tensioner link, and configured to generate a tension load on the endless flexible drive

Methodology Applied

Scientific EffectFriction: Friction

Data Source

PatentUS12234099B2Crop unloader drive with tensioner

Publication Date: 2025.02.25 BLUE LEAF I P INC

AI summary

A crop unloader system comprising: an elevator assembly, a boom assembly, a flexible drive, and a tensioning assembly. The elevator assembly has a frame, an elevator drive and drive motor, and an elevator drive output. The boom assembly has a frame connected to the elevator frame at a boom pivot axis to rotate through a range of motion, and an unloader drive input. The flexible drive is operatively connected between the elevator drive output and the unloader drive input. The tensioning assembly has a tensioner link and a control link that are pivotally to each other and with one of the two links each pivotally connected to one of the boom and elevator frame. An idler wheel is on the tensioner link. The tensioning assembly maintains a tension load on the endless flexible drive within a predetermined range, throughout the range of motion of the boom frame.