Conveyor Position Limiter Roller Design
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Solution Overview
Problem
Current position limiters for power-driven conveyors are prone to trapping dirt and debris, making them difficult to disassemble or replace, and they often compete with belt scrapers for space, posing food safety risks due to harborage zones for bacteria, especially in conveyor systems with flights.
Innovation Solution
A position limiter assembly with spaced rollers mounted to a mounting bar between opposing end plates, allowing for proper engagement of the conveyor belt with the drive sprocket while accommodating flights, and featuring a design that facilitates cleaning and easy assembly/disassembly, with angled roller mounting arms and a double wheel design to ensure proper alignment and hygiene.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If current position limiters are fixed to a mounting shaft, then proper engagement of the belt and drive is achieved, but dirt and debris are trapped and the position limiter becomes difficult to disassemble and replace
Solution Approach 1:
The position limiter is divided into separate modular components: a mounting bar with mounting arms, individually mounted rollers, and a detachable connection system. This segmentation allows each component to be independently accessed, removed, and replaced without disassembling the entire assembly, resolving the contradiction between reliable engagement and ease of repair.
Solution Approach 2:
The mounting arms are designed to be adjustable and repositionable along the mounting bar, allowing dynamic configuration of the position limiter. This enables easy adjustment and replacement while maintaining proper engagement, as components can be dynamically repositioned rather than fixed in static positions.
2Reliability
If the position limiter is placed at 165° of wrap where the belt naturally falls away, then proper belt positioning is achieved, but it competes for space with the belt scraper and creates harborage zones for bacteria
Solution Approach 1:
The position limiter is repositioned to a different angular location on the drive sprocket, moving from the traditional 165° wrap position to a new position that eliminates competition with belt scrapers. This dimensional repositioning in angular space resolves the space conflict and eliminates bacterial harborage zones while maintaining effective belt positioning through the roller mechanism.
3Reliability
If conventional position limiters are axially aligned with drive sprockets, then proper engagement is achieved, but locking collars or fasteners are required that become harborage zones for bacteria
Solution Approach 1:
The design extracts and eliminates locking collars and fasteners from the position limiter assembly. The mounting bar and mounting arms use a simplified attachment system that achieves stable axial alignment without requiring traditional fastening mechanisms, thereby removing bacterial harborage zones while maintaining engagement stability.
Solution Approach 2:
The position limiter components are designed as easily replaceable units that can be quickly removed and replaced without complex fastening systems. This disposable-like design approach eliminates the need for permanent fasteners and locking collars, reducing bacterial harborage while maintaining operational reliability through easy replacement.
4Reliability
If a fixed position limiter design is used, then proper belt engagement is achieved, but it becomes difficult to accommodate flights in the conveyor belt
Solution Approach 1:
The mounting arms are designed with adjustable positioning capabilities along the mounting bar, allowing the rollers to be dynamically repositioned to accommodate different flight configurations in the conveyor belt. This dynamic adjustability enables the same position limiter design to work with various belt types including those with flights, resolving the contradiction between reliable engagement and adaptability.
Data Source
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AI summary
A conveyor employs an assembly at a drive end having a position limiter assembly configured to accommodate flights in a conveyor belt while ensuring proper engagement between the conveyor belt and a drive. The end assembly includes opposing end plates, a drive extending between the end plates and a position limiter assembly extending between the end plates below the drive for ensuring proper engagement of a conveyor belt with the drive. The position limiter comprises a series of spaced apart rollers mounted to and spaced from a mounting bar extending between the end plates. Roller mounting arms connect the rollers to the mounting bars.