Strip Brush Assembly with Metal and Polymer Bristles
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Solution Overview
Problem
Existing strip brush assemblies for street sweepers either lack the aggressive cleaning capability of metal bristles or are structurally unsound due to the strong forces encountered, as they are typically made entirely of polypropylene or metal, with no efficient method to combine both materials effectively.
Innovation Solution
A strip brush assembly with both metal and polymer bristles, where metal bristles are supported by polymer bristles and mounted to a base that fits into a corresponding channel on a mandrel, manufactured using an extrusion process involving a conveyor belt and cooling device to form a secure and efficient structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If metal bristles are used in a strip brush assembly, then aggressive cleaning capability is improved, but structural integrity deteriorates because metal bristles bend and stay bent under strong contact forces with the street
Solution Approach 1:
The patent applies composite materials by combining metal bristles with polymer bristles in a single strip brush assembly. The metal bristles provide aggressive cleaning capability while the polymer bristles provide structural integrity and resilience. This composite structure allows the brush to withstand strong contact forces while maintaining both cleaning effectiveness and operational reliability.
2Reliability
If polypropylene bristles are used in a strip brush assembly, then structural integrity and resilience are improved, but aggressive cleaning capability deteriorates
Solution Approach 1:
The patent combines polymer bristles with metal bristles to create a composite structure where the polymer bristles maintain structural integrity and resilience, while the metal bristles provide aggressive cleaning capability. This resolves the contradiction by integrating both material properties into a single functional assembly.
Solution Approach 2:
The patent applies local quality by having different regions of the bristle assembly made from different materials - metal bristles in areas requiring aggressive cleaning and polymer bristles in areas requiring structural support and resilience. This localized material differentiation optimizes both cleaning capability and structural integrity.
3Adaptability or versatility
If a strip brush assembly is made entirely of polypropylene, then recyclability is improved, but aggressive cleaning capability deteriorates
Solution Approach 1:
The patent creates a composite strip brush assembly with both metal and polymer bristles, maintaining the ability to recycle the polymer components while incorporating metal bristles for enhanced cleaning capability. This resolves the contradiction by integrating recyclable polymer materials with metal cleaning elements in a unified structure.
4Object-generated harmful factors
If prior art methods are adapted to make strip brush assemblies with both polymer and metal bristles, then cleaning capability is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The patent merges the manufacturing processes for polymer and metal bristles into a single integrated operation. Both types of bristles are formed and assembled together in one continuous process, eliminating the need for separate manufacturing lines and reducing overall manufacturing complexity despite the dual-material composition.
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 combination of metal and polymer bristles provides effective and durable sweeping performance, with metal bristles offering deep cleaning and polymer bristles maintaining structural integrity, allowing for efficient street cleaning and reduced maintenance costs.
Implementation Method 1
manufactured using an extrusion process involving a conveyor belt and cooling device
Implementation Method 2
manufactured using an extrusion process involving a conveyor belt and cooling device
Data Source
AI summary
A strip brush assembly with a plurality of elongated polymer bristles forming a section and a plurality of elongated metal bristles forming another section adjacent the polymer bristles section, such that the metal bristles section is supported by the polymer bristles section. The polymer and metal bristles are bonded and encapsulated in a base formed by direct extrusion onto and around the polymer and metal bristles to secure them to the formed base. The strip brush assembly may be used on a tubular mandrel of a street sweeper.