Transfer Roller Rib Design for Crop Header Efficiency

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Solution Overview

Problem

Existing crop harvesting headers with rotary cutters face inefficiencies in transferring cut crop material from the cutting plane to the conditioning rolls, leading to suboptimal processing and potential blockages.

Innovation Solution

A crop harvesting header design featuring a transfer roller with a cylindrical body and angularly spaced ribs, positioned to align with the cutting plane and conditioning rolls, ensures effective crop transfer by providing a large surface area for contact while rotating at a slower speed than the conditioning rolls, ensuring efficient movement of crop material to the nip between the top and bottom conditioning rolls.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If a conventional transfer roller is used to move crop material from the cutting plane to the conditioning rolls, then the structure is simple, but the crop transfer efficiency is insufficient and blockages occur

Engineering Contradiction:

Improvecrop transfer efficiencyVSAvoidtransfer roller structure

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The transfer roller is segmented into multiple functional zones: a cutting plane engagement zone with ribs for gripping crop material, a transport zone for moving material upward and rearward, and a discharge zone near the conditioning rolls. This segmentation allows each zone to be optimized for its specific function, improving overall transfer efficiency while maintaining a relatively simple single-roller structure.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The transfer roller features non-uniform rib spacing and height along its circumference, with denser rib spacing near the cutting plane for effective gripping and sparser spacing near the discharge point for smoother material flow. This local variation in quality optimizes crop material handling at different positions along the roller, preventing blockages while maintaining structural simplicity.

Inventive Principle:

Principle #3Local quality

2Speed

If the transfer roller rotates at high speed to match the conditioning rolls, then the processing speed is high, but crop material transfer becomes inefficient and blockages increase

Engineering Contradiction:

Improveprocessing speedVSAvoidcrop material transfer efficiency

Core Design Contradiction:

SpeedVSProductivity

Solution Approach 1:

The transfer roller operates at a controlled rotational speed that is intentionally different from the conditioning rolls, creating a dynamic speed relationship that optimizes material transfer. The roller's rotation speed is adjusted to maintain optimal contact with both the cutting plane and the conditioning rolls, ensuring efficient crop material movement without causing blockages, thereby balancing speed and transfer efficiency.

Inventive Principle:

Principle #15Dynamics

3Area of moving object

If the transfer roller has a small surface area for compact design, then the device size is reduced, but contact with crop material is insufficient leading to poor transfer

Engineering Contradiction:

Improvetransfer roller surface areaVSAvoidcrop material contact effectiveness

Core Design Contradiction:

Area of moving objectVSEase of operation

Solution Approach 1:

The transfer roller utilizes the vertical dimension by extending its rib structure from the cutting plane upward toward the conditioning rolls. This vertical engagement allows the roller to contact crop material at multiple heights, increasing the effective contact area without significantly increasing the horizontal footprint. The ribs project vertically to grip and lift material, providing effective transfer while maintaining a compact overall design.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

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

The improved transfer roller arrangement enhances crop transfer efficiency, reducing the likelihood of blockages and improving the overall processing of cut crop material by ensuring effective surface contact and movement to the conditioning rolls, thus optimizing the harvesting process.

Implementation Method 1

a transfer roller mounted behind the disks and in front of the nip for transferring the crop upwardly and rearwardly from the disks to the nip

Methodology Applied

Scientific EffectFriction: Friction

Data Source

PatentUS7454888B2Crop harvesting header with rotary disks and a transfer roller carrying the cut crop to the nip of a pair of conditioning rolls

Publication Date: 2008.11.25 MACDON INDS

AI summary

A crop harvesting header has a cutter bar with a plurality of generally horizontal flail disks mounted thereon for driven rotation about generally upright axes spaced along the cutter bar. At least one of the disks is mounted outwardly of the discharge opening and carries an “hour glass” shape impeller to carry the crop inwardly. A pair of conditioner rolls is mounted in the discharge opening and a transfer roller is mounted behind the disks and in front of the nip for transferring the crop upwardly and rearwardly from the disks to the nip. The transfer roller is of the same diameter as the bottom roll and carries high ribs preferably forwardly inclined for an aggressive action on the crop. The roller is mounted with its axis above the cutting plane and its uppermost edge of the ribs at or above the axis of the bottom roll.