Positive Operating Combine Unloader Discharge Door

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing unloading tube discharge systems face issues with grain loss due to spring-loaded dribble doors that are susceptible to wind drift and irregular discharge streams, especially when small amounts of grain are present, leading to inefficiencies and unintentional grain loss during transportation.

Innovation Solution

A discharge door arrangement with a pivotally attached door that is positively controlled by actuators to open and close independently of grain presence, minimizing obstruction and ensuring a cohesive grain flow path, combined with support struts oriented to reduce grain flow disruption.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a spring-loaded dribble door is used to control grain discharge, then the door can be biased toward a closed position to prevent grain loss, but the door may only partially open or vary in position with changing grain amounts, resulting in an irregular discharge stream susceptible to wind drift

Engineering Contradiction:

Improvegrain discharge controlVSAvoiddischarge stream regularity

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The patent replaces the spring-loaded mechanical door system with a positively controlled door system. The door is moved to an open position by a motor-driven mechanism that engages with gear teeth on the door, providing positive mechanical control rather than relying on spring force and grain pressure balance. This substitution eliminates the partial opening and position variation problems while maintaining reliable discharge control.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The discharge door system is integrated with the auger operation such that the door automatically opens when the auger is operating and closes when the auger stops. The control system monitors auger operation and automatically actuates the door, eliminating the need for separate manual control while ensuring the door position always matches the operational state of the grain discharge system.

Inventive Principle:

Principle #25Self-service

2Loss of substance

If a spring-loaded dribble door is used, then the spring can oppose door opening to reduce grain dribbling when the auger is not operating, but this same spring force prevents the door from opening fully when small amounts of grain are present

Engineering Contradiction:

Improvegrain dribbling preventionVSAvoiddischarge efficiency

Core Design Contradiction:

Loss of substanceVSProductivity

Solution Approach 1:

The patent employs a dynamically adjustable door control system that adapts its behavior based on operational conditions. The motor-driven mechanism can apply varying forces to move the door fully open during active discharge operations, regardless of grain amount. The system transitions from a static spring-loaded design to a dynamic controlled system that optimizes door position for both prevention and efficiency requirements.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The control system changes the operational parameters of the door based on the state of the auger and discharge requirements. When the auger is operating, the door is moved to a fully open position (parameter change from partially closed to fully open). The system monitors operational parameters and adjusts door position accordingly, enabling full opening even with small grain amounts while preventing dribbling when idle.

Inventive Principle:

Principle #35Parameter changes

3Reliability

If the discharge door is positioned to cover the discharge outlet, then grain loss is prevented when closed, but the door obstructs the grain flow when open, influencing the position and flow path of the discharge stream

Engineering Contradiction:

Improvegrain discharge controlVSAvoiddischarge stream coherence

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The patent segments the door structure into distinct functional zones. The door is designed with a grain-flow-friendly geometry that separates the sealing function (when closed) from the flow guidance function (when open). The door edge is configured to clear the discharge stream path when open, eliminating obstruction while maintaining the ability to seal the discharge outlet when closed. This segmentation of functions resolves the conflict between coverage and flow coherence.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent addresses the obstruction problem by changing the spatial relationship between the door and discharge stream. The door is positioned and dimensioned such that when open, it occupies a different spatial plane that does not intersect with the grain flow path. This dimensional adjustment allows the door to provide full coverage when closed while being transparent to the grain stream when open, eliminating the influence on discharge stream coherence.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Data Source

PatentUS7584836B2Positive operating combine unloader discharge door arrangement

Publication Date: 2009.09.08 BLUE LEAF I P INC

AI summary

A positive operating combine unloading discharge door which operates independent of the presence of grain in the unloading tube and is attached to the unloading tube to minimize opposition and obstruction to grain flow and completely cover the open end of the unloading tube when the unloading cycle is complete to minimize or eliminate grain loss due to grain dribble.