Screw Conveyor Transition Runner for Combine Harvester Clogging
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Solution Overview
Problem
Conventional screw conveyor assemblies in combine harvesters face issues with material transfer, particularly with moist or fine-grained crops, leading to clogging and mechanical damage due to the spatial distance between conveyor elements and inadequate conveying behavior.
Innovation Solution
Incorporating a runner or additional conveyor element with a ramp-like helical portion in the transition housing between the first and second conveyor screws, which conducts material from the first conveyor screw to the second, and a drive connection shielded by a covering to enhance conveying efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a transition housing with drive elements (propeller shafts) is used to connect the first and second conveyor screws, then the conveyor system can transfer material between vertical and horizontal portions, but spatial distance arises between conveyor elements and clogging occurs with certain crop conditions
Solution Approach 1:
A runner is introduced as an intermediary passive element in the transition housing to bridge the gap between the first and second conveyor screws. The runner conducts material from the first screw to the second screw, eliminating the spatial distance that causes clogging while maintaining the structural transition between vertical and horizontal conveyor portions.
Solution Approach 2:
The transition housing is segmented into functional zones: the runner provides passive material conduction, while additional actively driven conveyor elements (blades or paddles) are added to the first conveyor screw helix to enhance material output. This segmentation allows each element to address specific aspects of the material transfer problem.
2Reliability
If conveyor elements (blades, paddles) are fitted to a connecting shaft in the transition housing to improve conveying behavior, then material transfer improves, but the connecting shaft and joints cannot be covered and grain contacts lubricant causing mechanical damage
Solution Approach 1:
The runner serves as a mediator that enables material conduction without requiring the connecting shaft and its joints to be exposed. By providing a dedicated passive conduction path through the runner, the design allows the drive connection to be shielded from the material flow, preventing grain contact with lubricant and joint elements.
Solution Approach 2:
The harmful elements (connecting shaft joints and lubricant) are extracted from the material flow path. The runner provides an alternative material conduction route that bypasses the drive connection area, allowing the shaft to be covered and isolated from grain contact while maintaining conveying function.
3Volume of stationary object
If the cross section of the transition housing is tapered from the first toward the second screw conveyor, then space is optimized, but transfer problems and clogging occur with moist grain or small grain dimensions
Solution Approach 1:
The runner acts as a mediator that ensures reliable material transfer through the tapered transition housing. By providing a dedicated conduction path along the helix of the first conveyor screw, the runner maintains material flow control even in the constrained geometry of the tapered cross-section, preventing clogging of moist or fine-grained crops.
Solution Approach 2:
The transition housing employs local quality variations: the cross-section is tapered to optimize overall space utilization, while the runner provides localized material conduction guidance along the helix. This allows the housing to be compact while the material flow path maintains sufficient clearance to prevent clogging.
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
Improves material output behavior by reducing clogging and mechanical damage, ensuring smooth transfer of granular materials like grain, even under challenging conditions.
Implementation Method 1
The runner is arranged to conduct the material being conveyed from the first conveyor screw to the second conveyor screw
Implementation Method 2
fasten an additional conveyor element to the helix of the first conveyor screw
Data Source
AI summary
A screw conveyor assembly includes a first screw conveyor with a first housing and a first conveyor screw arranged therein, a second screw conveyor with a second housing and a second conveyor screw arranged therein, a transition housing to which the first housing and the second housing are connected forming a transition angle, and a runner disposed in the transition housing and arranged to conduct material being conveyed from the first conveyor screw to the second conveyor screw. The first conveyor screw is arranged upstream of the second conveyor screw. An additional conveyor element is disposed on a helix of the first conveyor screw, such that the helix is directly adjacent to the transition housing.