Sealed Conveyor Sprocket Bore Interface Against Contamination
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Solution Overview
Problem
Conveyor sprockets are prone to contamination from dirt, bacteria, and liquids entering through the bore hole, compromising hygiene and creating a potential source of contamination due to the interface between the sprocket and shaft.
Innovation Solution
A seal system comprising a seal cap housing ring and annular seals is used to seal the interface between the sprocket and shaft, including radially inner and outer o-rings or alternative seals, and a tolerance ring to ensure a secure and hygienic connection, preventing contamination from entering the sprocket bore.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional sprocket with an open bore hole is used, then the structure is simple and easy to manufacture, but dirt, bacteria and liquid can enter the bore hole compromising hygiene
Solution Approach 1:
The sprocket is divided into separate components: the sprocket body, the seal cap, and the sealing elements (O-rings). This segmentation allows the sealing function to be added as a distinct module, preventing contamination while maintaining the simplicity of the individual components and enabling easy manufacturing of each part.
Solution Approach 2:
A seal cap is introduced as an intermediary component between the sprocket body and the shaft. This seal cap, combined with sealing elements, creates a barrier that prevents dirt, bacteria, and liquid from entering the bore hole, thereby improving hygiene without fundamentally altering the sprocket's core structure.
2Object-affected harmful factors
If a seal system is added to prevent contamination, then hygiene is improved, but the device complexity increases
Solution Approach 1:
Flexible O-ring seals are used to create effective barriers against contamination. These thin, flexible sealing elements can conform to the interfaces between components, providing reliable protection against dirt, bacteria, and liquid ingress while adding minimal structural complexity.
Solution Approach 2:
The sealing elements (O-rings) are nested within grooves in the seal cap and sprocket body, and the seal cap itself is nested within the sprocket assembly. This nested arrangement integrates the sealing function into the existing structure without requiring separate, complex sealing systems.
3Reliability
If the interface between sprocket and shaft is exposed, then assembly is simple, but bacteria and debris can accumulate creating contamination sources
Solution Approach 1:
The sealing function is extracted as a separate, pre-assembled seal cap module that can be easily installed into the sprocket. This extraction allows the sealing system to be manufactured and tested independently, then simply integrated into the sprocket assembly, maintaining ease of manufacture while preventing contamination at the shaft interface.
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 seal system effectively prevents contamination from entering the sprocket, enhancing hygiene and reliability by creating a sealed interface between the sprocket and shaft, thereby reducing the risk of bacterial growth and debris ingress.
Implementation Method 1
a first annular seal compressively seated in a groove for sealing an interface between the sprocket and the annular seal cap
Implementation Method 2
a second annular seal compressively seated in a groove for sealing an interface between the annular seal cap and the shaft
Data Source
AI summary
A sealed sprocket for a conveyor belt comprises a sprocket mounted on a drive shaft and a seal system sealing an interface between the sprocket and the drive shaft. The seal system comprises a seal cap housing ring seals for sealing interfaces between the sprocket and seal cap and between the seal cap and drive shaft.