Polymer Idler Roller Labyrinth Seal for Grit Infiltration
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Solution Overview
Problem
Conveyor belt idlers face issues with grit infiltration into bearings, leading to premature failure and increased operational costs due to the need for frequent replacements.
Innovation Solution
The idler design features polymer idler ends that are press-fit into the idler sleeve, with a bearing assembly that includes a double ball bearing and a labyrinth seal to prevent particulate debris from entering the bearing assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional seals are used to protect bearings from grit infiltration, then some protection is provided, but the seals are not entirely effective and grit eventually infiltrates the bearing assembly causing failure
Solution Approach 1:
The patent introduces a polymer seal as an intermediary component between the bearing assembly and the external environment. This seal acts as a mediator that physically blocks grit and particulate debris from reaching the bearing, providing effective protection while allowing the bearing to function independently without direct exposure to contaminants.
Solution Approach 2:
The patent employs a flexible polymer seal that forms a protective barrier around the bearing assembly. This thin film structure effectively prevents grit infiltration while maintaining the operational integrity of the bearing, addressing the limitation of traditional seals that allowed contamination to penetrate.
2Strength
If solid steel shafts are used for idler construction, then structural strength is ensured, but the idlers become heavy increasing construction and shipping costs
Solution Approach 1:
The patent transitions from solid steel shafts to a composite construction using a polymer idler body combined with a metal bearing assembly. This composite approach maintains the necessary structural strength for supporting conveyor belts while dramatically reducing the overall weight, thereby lowering construction and shipping costs.
Solution Approach 2:
The patent changes the material parameter of the idler shaft from solid steel to polymer composite material. This parameter change preserves the functional requirements for strength and support while significantly reducing density and weight, addressing the contradiction between strength and weight.
3Ease of manufacture
If polymer idler ends are press fit into the idler sleeve, then weight is reduced and manufacturing is simplified, but the connection must withstand significant mechanical stress
Solution Approach 1:
The patent divides the idler into separate components: a polymer idler body and a metal bearing assembly that is press fit into the polymer. This segmentation allows each component to be manufactured independently using optimal processes, then assembled together, simplifying manufacturing while maintaining connection strength through the press fit interface.
Solution Approach 2:
The patent uses a composite construction where a metal bearing assembly is press fit into a polymer idler body. This composite approach provides a strong mechanical connection that can withstand conveyor belt stresses while maintaining ease of manufacture through modular assembly rather than monolithic steel construction.
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
This design significantly reduces the risk of idler failure due to grit infiltration, extends the lifespan of conveyor belt idlers, and lowers operational costs by minimizing the need for premature replacements.
Implementation Method 1
Each idler end includes a polymer body that is overmolded onto a bearing that rotatably supports an axle
Implementation Method 2
The body defines a outwardly facing face that defines a series of concentric grooves and/or ridges that confront corresponding ridges and/or grooves on a cap so as to allow for rotational motion while providing a labyrinth seal that resists infiltration of particulate debris into the bearing assembly
Implementation Method 3
The bearing assembly can define, for example, a double ball bearing that enhances the stability and support of the axle
Implementation Method 4
polymer idler ends that are press fit into the opposing edges of an idler sleeve
Data Source
AI summary
This invention provides an idler for use in a framework that supports a conveyor belt having polymer idler ends that are press fit into the opposing edges of an idler sleeve. Each idler end includes a polymer body that is overmolded onto a bearing that rotatably supports an axle, which that engages an upright of the framework. The body defines an outwardly facing face that defines a series of concentric grooves and/or ridges that confront corresponding ridges and/or grooves on a cap so as to allow for rotational motion while providing a labyrinth seal that resists infiltration of particulate debris into the bearing assembly. The bearing assembly can define a double row ball bearing. The body can include a set of concentric grooves along a base that engages an inner surface of the sleeve thereby enhancing the press fit and further resisting infiltration of debris into the bearing assembly.