Tandem Seal for Conveyor Roller Contamination
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Solution Overview
Problem
Conveyor rollers are prone to contamination by dust and debris, leading to unscheduled downtime and high maintenance costs due to roller failure, as existing solutions do not effectively prevent contamination of the roller mechanism.
Innovation Solution
A tandem seal system is implemented for conveyor rollers, comprising a combination of seals including a first contact seal between a guard and an end cap, and a second contact seal between the axle and the flanged housing, creating a convoluted path to prevent debris ingress, with a labyrinth seal configuration to further minimize contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single seal is used for the conveyor roller, then the structure is simple, but contamination by dust and debris occurs leading to roller failure
Solution Approach 1:
The seal is divided into two separate contact seals positioned at different locations. The first contact seal is located between the guard and end cap, while the second contact seal is located between the axle and flanged housing. This segmentation provides redundant sealing protection, ensuring that if one seal fails, the other continues to prevent contamination, thereby resolving the contradiction between reliability and structural simplicity.
Solution Approach 2:
The tandem seal arrangement nests multiple sealing functions within the existing roller structure. The first and second contact seals are integrated into the available spaces within the flanged housing and guard assembly, creating a compact multi-layer sealing system without significantly increasing overall device complexity.
2Object-affected harmful factors
If existing seal solutions are used, then the structure is simple, but contamination prevention is insufficient
Solution Approach 1:
The guard acts as an intermediary component between the external environment and the bearing assembly. The first contact seal is positioned between the guard and end cap, creating an additional barrier that intercepts contaminants before they can reach the critical bearing assembly, thereby enhancing contamination prevention while maintaining reasonable structural complexity.
3Reliability
If no seal is used, then the structure is simplest, but roller failure occurs due to contamination
Solution Approach 1:
The sealing system is segmented into two distinct contact seals positioned at different critical locations within the roller assembly. This segmentation provides comprehensive protection against contamination while keeping each individual seal component relatively simple in design, balancing reliability improvement with acceptable complexity.
Solution Approach 2:
The tandem seal configuration applies sealing measures at specific critical locations where contamination would have the most harmful effect. The first contact seal protects the bearing assembly from the guard side, while the second contact seal provides protection from the housing side, creating localized high-quality sealing zones that maximize reliability without requiring complete system-wide complexity.
Data Source
AI summary
A tandem seal, according to the present invention, is provided for a conveyor roller having a drum body with opposing ends rotatably mounted on an axle by way of a bearing assembly within a flanged housing attached at either end of the drum body. The tandem seal has an end cap rigidly mounted within the flanged housing, extending radially inwardly towards the axle and spaced apart therefrom. A guard is rigidly mounted on the axle and extends radially outwardly from the axle and is spaced apart from the end cap. A first contact seal seals the space between the guard and the end cap and a second contact seal seals the space between the axle and the flanged housing.