Drum Conveyor Third Axle Wear Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Drum conveyors in agricultural harvesting heads experience significant wear in plastic bushings, which is costly to mitigate with ball or roller bearings due to the high number of fingers involved.
Innovation Solution
A drum conveyor design featuring a third axle supported by bearings for free rotation, with fingers rotating on this axle and driven by friction, reducing wear by optimizing the friction distribution between the fingers and the axle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If plastic bushings are used for finger rotation, then manufacturing cost is reduced, but wear resistance deteriorates
Solution Approach 1:
A third axle is introduced as an intermediary component between the stationary shaft and the fingers. This axle rotates freely within the stationary shaft and carries the fingers, which are supported by bearings. The intermediary axle distributes the rotational load and reduces direct wear between the plastic bushings and the stationary shaft, thereby improving wear resistance while maintaining the use of cost-effective plastic materials.
Solution Approach 2:
The patent replaces the direct rotational support mechanism (plastic bushing on stationary shaft) with a bearing-supported axle system. The third axle with bearings substitutes the worn plastic bushing arrangement, transferring the rotational function to a more durable bearing mechanism while keeping the plastic fingers for cost-effectiveness.
2Reliability
If ball or roller bearings are used instead of plastic bushings, then wear resistance is improved, but manufacturing cost increases
Solution Approach 1:
The rotational support function is segmented into two parts: the third axle with bearings for high-load rotational support, and the plastic finger bushings for low-cost finger mounting. This segmentation allows bearings to be used only where necessary (on the third axle) rather than in all finger mounting points, reducing overall cost while improving wear resistance at critical locations.
Solution Approach 2:
Bearings are applied locally at the third axle where the highest rotational loads occur, rather than uniformly across all finger mounting points. The plastic bushings are retained at the finger level where loads are lower. This localized application of high-performance bearings optimizes wear resistance while controlling manufacturing costs.
3Device complexity
If fingers are mounted on a stationary shaft, then structural simplicity is maintained, but wear on bushings increases
Solution Approach 1:
The system transitions from a completely stationary shaft to a dynamic configuration where the third axle rotates freely within the stationary shaft. This dynamic element allows the third axle to carry the rotational motion and bearing loads, reducing wear on the stationary shaft and plastic bushings while maintaining overall structural simplicity.
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 design significantly reduces wear on the bearing portions of the fingers, extending their lifespan and reducing the need for costly replacement parts while maintaining synchronized rotation with the drum.
Implementation Method 1
friction between the plurality of fingers and the third axle drives the third axle in rotation
Implementation Method 2
The third axle is supported for free rotation on the first link member and the second link member by bearings
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
A drum conveyor has a laterally extending drum (120), first and second stub axles (204, 206) extending into the ends of the drum; two link members (208, 210) that are fixed to the stub axles inside the drum and that support a third axle (212) inside the drum for free rotation with respect to the two link members.