Wrapping Ring Contact Assembly for Low-Wear Power Transfer
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Solution Overview
Problem
Existing wrapping machines with horizontal rotating rings face issues of frequent wear and tear of contacting brushes and annular conductive bars due to centrifugal forces, leading to laborious maintenance, prolonged downtime, and potential malfunctions from interruptions in electric current supply.
Innovation Solution
The wrapping machine features removable and interchangeable supporting rings with conductive bars on the outer side wall, allowing easy replacement of brushes and conductive bars, and includes a detector device to monitor current interruptions, ensuring continuous power supply through a backup battery and reducing wear by minimizing centrifugal force impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If brushes and conductive bars are positioned inside the rotating ring to abut the annular tracks, then power and signal transmission is achieved, but wear and tear increases due to centrifugal force during rotation
Solution Approach 1:
The patent inverts the conventional arrangement by positioning the conductive bars on the outer periphery of the rotating ring instead of inside. This inversion places the wear-resistant conductive bars in a position where they experience reduced centrifugal force effects, while the brushes remain stationary or move with the carriage. This resolves the contradiction by maintaining reliable power transmission while significantly reducing wear and extending maintenance intervals.
Solution Approach 2:
The patent applies local quality by using different materials with specific properties at different locations: conductive bars made of wear-resistant material (e.g., copper alloy or carbon composite) are positioned on the rotating ring's outer periphery, while brushes made of softer, self-lubricating material are positioned to abut these bars. This localized material differentiation optimizes both power transmission reliability and wear resistance.
2Reliability
If brushes are kept in abutment with conductive bars using elastic elements to prevent detachments, then continuous power supply is maintained, but friction and wear increase
Solution Approach 1:
The patent changes the physical parameters of the contact interface by using conductive bars with larger contact surface area compared to traditional point-contact brushes. This parameter change distributes the contact force over a larger area, reducing pressure and friction while maintaining reliable electrical contact. The elastic elements are designed to apply just enough force to ensure continuous contact without excessive friction.
3Use of energy by moving object
If annular conductive bars are made of metallic material with high electrical conductivity, then power transmission efficiency is improved, but wear resistance decreases
Solution Approach 1:
The patent employs composite materials for the conductive bars, combining materials with high electrical conductivity (such as copper or copper alloy) with materials providing enhanced wear resistance (such as ceramic coatings, carbon-based composites, or hardened surface treatments). This composite approach simultaneously achieves high power transmission efficiency and improved wear resistance, resolving the contradiction between these two properties.
4Ease of operation
If sliding electric contact means are provided for power and control signals, then unwinding unit operation is enabled, but frequent maintenance is required due to brush wear
Solution Approach 1:
The patent segments the sliding electric contact system into modular components: stationary brush assemblies, modular conductive bar segments on the rotating ring, and replaceable support structures. This segmentation allows individual components to be inspected, replaced, or maintained independently without shutting down the entire unwinding unit, significantly reducing maintenance frequency and improving ease of repair while maintaining operational capability.
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 extends maintenance intervals, reduces downtime, and facilitates quick replacements, while maintaining consistent power and signal transmission, thus enhancing operational reliability and efficiency.
Implementation Method 1
The brushes are kept in abutment with the conductive bars with a predefined pushing force by means of elastic elements, such as springs
Implementation Method 2
the wear of the brushes is also accentuated by the centrifugal force that acts on the brushes during the rotation of the rotating ring and that contributes with the springs to keep the brushes in contact with the annular tracks
Implementation Method 3
The brushes include sliding elements made of material with high electrical conductivity and low friction coefficient, generally graphite-based sintered material. Although the brushes are made of material with a low friction coefficient, they are still subject to progressive wear
Data Source
AI summary
A wrapping machine for wrapping a load with a film or band comprises a main frame which slidably supports a supporting carriage movable along a working direction, a moving ring rotatably supported by said supporting carriage and rotatable about a wrapping axis which supports an unwinding unit provided with a reel of film and pre-stretching rollers, a sliding electric contact assembly for supplying electric current to, and/or exchanging electric signals with, said unwinding unit and comprising a brush assembly fixed to the moving ring and arranged to slidably abut a conductive bar assembly fixed to a supporting ring connected to the supporting carriage to receive electric current and/or to exchange electric signals; the supporting ring is removably connected to the supporting carriage and interchangeable.