Cable-Type Load Sensor Using Conductive Rubber
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional load sensors face challenges in achieving high precision and low cost due to complex electrical processing circuits and low noise tolerance, with existing cable-type sensors struggling to accurately detect load intensity without mechanical deterioration.
Innovation Solution
A cable-type load sensor comprising a linear member of electrically conductive rubber with a hollow central part and a cladding layer of the same rubber material, filled with conductive fillers like carbon black, allowing for precise load detection without directional restrictions and mechanical degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional electrical sensors or optical fiber sensors are used, then load detection capability is provided, but the structure becomes complex and cost increases
Solution Approach 1:
The patent replaces complex electrical processing circuits and optical sensing systems with a simple conductive rubber-based sensor that directly converts mechanical load into electrical resistance changes. The conductive rubber element with conductive particles provides load detection through pure mechanical-electrical conversion, eliminating the need for complex signal processing hardware.
Solution Approach 2:
The patent utilizes changes in electrical resistance parameters of the conductive rubber material in response to mechanical deformation. By monitoring resistance variations caused by particle redistribution during compression, the system achieves accurate load measurement with simple circuitry.
2Measurement precision
If conventional load sensors with complex circuits are used, then load detection is enabled, but noise tolerance decreases
Solution Approach 1:
The patent replaces electronic signal processing systems with a direct mechanical-to-electrical conversion mechanism using conductive rubber. This eliminates multiple electronic stages where noise could be introduced, providing inherently higher noise tolerance while maintaining detection accuracy.
3Measurement precision
If sheet-type conductive rubber sensors are used, then pressure detection is enabled, but bending direction is restricted
Solution Approach 1:
The patent transitions from a two-dimensional sheet-type sensor to a three-dimensional cable-type structure. This dimensional change allows the sensor to accept loads from multiple directions and bend in various orientations, providing spatial versatility while maintaining pressure detection capability through the conductive rubber's volumetric deformation.
4Adaptability or versatility
If cable-type pressure sensor is used, then layout flexibility is improved, but load intensity discrimination capability is lost
Solution Approach 1:
The patent employs continuous electrical resistance parameter changes in the conductive rubber material that correspond to varying load intensities. Unlike binary contact sensors, this system provides analog resistance values that directly reflect the magnitude of applied load, enabling precise intensity discrimination while maintaining cable-type layout flexibility.
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 enables high-precision, low-cost load sensing with reduced mechanical deterioration and flexibility in layout, allowing for accurate load detection across various bending directions and positions.
Implementation Method 1
a linear member composed of electrically conductive rubber and having a hollow part extending in the longitudinal direction at the central part of the cross section
Implementation Method 2
the rubber material is composed of silicone rubber or ethylene-propylene rubber having volume elasticity modulus between 105 Pa and 108 Pa
Implementation Method 3
the electrically conductive rubber is composed of the rubber material filled with electrically conductive filler
Data Source
AI summary
A cable-type load sensor having an advantage in layout and being capable of sensing the load precisely is provided. The cable-type load sensor comprises a linear member composed of electrically conductive rubber and having a hollow part extending in the longitudinal direction at the central part of the cross section, and a cladding layer composed of the same kind of rubber material as the linear member and covering the circumference on the linear member.