Multilayer Cable Protection Tube for Friction and Static Dissipation
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Solution Overview
Problem
Multilayer tubes for conduits and cables in automated systems, such as those in the automotive industry, face issues with friction-induced electrostatic charge accumulation, mechanical stress, and limited flexibility, which can lead to damage and safety risks due to friction and potential explosive environments.
Innovation Solution
A multilayer tube with an inner layer of PTFE for low friction and electrostatic discharge, intermediate reinforcement layers, and an outer antistatic and conductive layer, including a reinforcement spiral for maintaining shape, reduces friction and charge accumulation while ensuring mechanical strength and flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the multilayer tube uses conventional materials for intermediate reinforcement layers, then mechanical strength is improved, but electrostatic charge accumulation increases due to friction
Solution Approach 1:
The patent applies composite materials by using a multilayer structure where the intermediate reinforcement layer is made of electrically conductive material (such as metal mesh or conductive polymer) combined with the reinforcing function. This composite approach simultaneously provides mechanical strength through the reinforcement layer and electrostatic discharge capability through the conductive material, resolving the contradiction between strength and charge accumulation.
Solution Approach 2:
The patent converts the harmful electrostatic charge accumulation into a beneficial feature by using the conductive intermediate reinforcement layer to actively dissipate charges. The friction that previously caused harmful charge buildup now generates charges that are immediately conducted away through the conductive layer, transforming the harmful effect into a controlled electrical conduction process.
2Strength
If the multilayer tube uses conventional materials for outer covering layer, then mechanical protection is improved, but friction with metallic parts increases leading to more charge accumulation
Solution Approach 1:
The outer covering layer is designed as a composite structure combining a mechanical protection layer (such as polyurethane or nylon) with an embedded conductive layer or conductive coating. This composite material provides both the mechanical protection needed for durability and the electrostatic discharge capability to reduce charge accumulation from friction with metallic parts.
Solution Approach 2:
The conductive outer covering layer acts as an intermediary between the friction contact with metallic parts and the internal cable/conduit. It mediates the friction interaction by providing a controlled electrical path that dissipates charges generated during sliding contact, preventing charge accumulation while maintaining mechanical protection.
3Ease of operation
If the multilayer tube uses smooth internal surface, then cable sliding is improved, but friction reduction may compromise mechanical strength
Solution Approach 1:
The patent segments the tube into distinct functional layers: the inner layer provides smooth cable sliding (ease of operation), the intermediate reinforcement layer provides mechanical strength, and the outer layer provides environmental protection. This segmentation allows each layer to be optimized for its specific function without compromising the others, resolving the contradiction between sliding ease and mechanical strength.
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 solution effectively prevents electrostatic charge accumulation, reduces friction, and maintains mechanical strength and flexibility, enhancing safety and performance by allowing smooth sliding and easy maintenance of conduits and cables in high-stress automated environments.
Implementation Method 1
an inner layer 11 made of polymeric material, which is electrically at least antistatic, with a smooth internal surface 12... The inner layer 11, according to the invention, is made of PTFE. PTFE in fact notoriously has the characteristic of an extremely low static and dynamic friction coefficient
Implementation Method 2
an inner layer 11 made of polymeric material, which is electrically at least antistatic... one or more intermediate layers 13 of electrically at least antistatic reinforcement, an outer layer 14 made of electrically at least antistatic polymeric material, a covering and finishing layer 15, which is electrically at least antistatic
Data Source
Figure 1~2
AI summary
A multilayer containment and protection tube (10, 110) for conduits, cables and the like, comprising - an inner layer (11, 111) made of polymeric material, which is electrically at least antistatic, with a smooth internal surface (12, 112), which forms a duct for supporting conduits or cables, - one or more intermediate layers (13, 113) of electrically at least antistatic reinforcement, - an outer layer (14) made of electrically at least antistatic polymeric material, - a covering and finishing layer (15), which is electrically at least antistatic.