Modular Secondary Belt Cleaner With Torsion-Tensioned Replaceable Tips
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Solution Overview
Problem
Conventional secondary belt cleaners are sensitive to temperature changes and require full replacement when the cleaning element wears out, leading to increased rebuild costs.
Innovation Solution
A secondary belt cleaning system using a stainless steel torsion spring to rotatably bias a replaceable carbide blade tip against the conveyor belt surface, allowing for independent replacement of the blade tip without affecting other components, and featuring a modular design to minimize temperature sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If rubber or urethane tensioning elements are used with the cleaning arm, then the cleaning device can provide flexibility and tensioning, but the performance changes as temperature rises and falls
Solution Approach 1:
The patent changes the material parameter from rubber/urethane to stainless steel torsion spring, which has vastly different thermal expansion characteristics and maintains consistent mechanical properties across temperature variations, eliminating the temperature sensitivity problem while preserving the necessary flexibility
Solution Approach 2:
The patent uses a composite structure combining stainless steel torsion spring with carbide blade tip, where each material is selected for its specific properties - the stainless steel provides temperature-insensitive elastic behavior while the carbide provides wear-resistant cleaning capability
2Device complexity
If the cleaning element is molded into the cleaning arm, then the structure is integrated and simple, but the entire cleaning device requires replacement when the cleaning element becomes worn
Solution Approach 1:
The patent segments the cleaning device into distinct replaceable components - specifically the carbide blade tip can be independently replaced from the blade support and torsion spring assembly. This modular design maintains structural simplicity while enabling selective replacement of only the worn blade tip, significantly reducing repair costs
Solution Approach 2:
The patent enables recovery and reuse of expensive components like the stainless steel torsion spring and blade support by allowing only the worn carbide blade tip to be discarded and replaced, rather than replacing the entire assembled unit
3Reliability
If the entire cleaning device is replaced when the cleaning element wears, then the cleaning performance is restored, but the rebuild costs greatly increase
Solution Approach 1:
The cleaning device is segmented into replaceable blade tips and a reusable support structure, allowing only the worn blade tips to be replaced while retaining functional components, thereby restoring cleaning performance at minimal cost
Solution Approach 2:
The design enables discarding only the consumable blade tips while recovering and reusing the expensive torsion spring and support structure, dramatically reducing rebuild costs compared to complete device replacement
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 system maintains cleaning effectiveness across temperature variations and reduces rebuild costs by enabling quick onsite replacement of worn blade tips, improving operational efficiency and cost-effectiveness.
Implementation Method 1
each one of the plurality of blade devices comprising a torsion spring (e.g., stainless steel torsion spring) to rotatably bias a replaceable blade tip (e.g., a carbide blade tip) against the return surface of the conveyor belt
Data Source
AI summary
A secondary belt cleaner system for cleaning the surface of the return side of an endless conveyor belt. The system includes a plurality of blade devices that are rotatably biased against the return side surface using a respective torsion spring therein. Each blade device includes a head portion formed by a blade support and a replaceable blade tip that is releasably secured to the blade support. The head portion is connected to one end of a blade arm and the other end of the blade arm is coupled to a rotatable shaft inside a housing that is fixedly secured to a support shaft having mounting brackets at each end for mounting the system transversely to the conveyor belt frame. Adjacent blade devices have different blade arm lengths in order to have the blade coverage overlap with no gaps in between. Because these blade arm lengths are different and to maintain each blade tip in contact with the return side surface, the respective torsion springs in adjacent blade devices are pretensioned to different angular amounts.