Dynamic Sensor Sorting Dissimilar Metals
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for sorting copper wiring and other non-ferrous metals from waste streams are inefficient and costly, particularly due to limitations in existing sensors and separation technologies such as magnets, eddy current separators, and inductive sensors, which struggle with speed and sensitivity.
Innovation Solution
A dynamic sensor system that uses a modified inductive sensor to detect metallic objects by processing the rate of change of current rather than magnitude, coupled with a computer-controlled material diverter unit to efficiently sort and divert metallic objects from a conveyor belt, allowing for faster processing and higher volume throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If standard inductive sensors are used to detect metallic materials, then metal detection capability is achieved, but processing speed is limited and sensitivity to varying sizes is poor
Solution Approach 1:
The patent applies dynamics by transitioning from static inductive sensors to dynamic sensors that measure the rate of change of inductance over time. This dynamic measurement approach enables the system to detect metallic objects at higher speeds while maintaining sensitivity, as the rate of change signal provides more distinct information about metallic materials passing through the sensor field.
Solution Approach 2:
The patent changes the measurement parameter from static inductance magnitude to the rate of change of inductance (dL/dt). This parameter transformation allows the sensor to distinguish metallic objects more effectively and process materials at higher speeds, resolving the contradiction between detection sensitivity and processing speed.
2Reliability
If eddy current separators are used to separate non-ferrous metals, then separation capability is achieved, but performance deteriorates on small and irregularly shaped heavier metals such as copper wire
Solution Approach 1:
The patent replaces the mechanical eddy current separation system with an electromagnetic sensing and detection system. Instead of using physical forces to separate materials, the system uses dynamic inductive sensors to detect metallic objects and directs them through pneumatic or mechanical actuators, enabling effective separation of small irregular metals like copper wire that were previously difficult to handle.
3Measurement precision
If manual sorting by laborers is used, then sorting accuracy is maintained, but labor cost becomes too high to be sustainable
Solution Approach 1:
The patent implements self-service by equipping the system with dynamic sensors and automated detection capabilities that enable the sorting system to identify and separate metallic materials autonomously without human intervention. The dynamic sensors automatically detect metallic objects and trigger actuators to divert them, replacing manual labor while maintaining sorting accuracy.
4Productivity
If faster processing speed is implemented, then productivity increases, but detection sensitivity and accuracy may deteriorate
Solution Approach 1:
The patent employs periodic action by using dynamic sensors that continuously measure the rate of change of inductance as materials pass through the sensor field. This time-based periodic measurement approach captures transient signals from rapidly moving metallic objects, enabling accurate detection at high processing speeds where static sensors would fail.
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 dynamic sensor system effectively increases processing speed and efficiency, enabling cost-effective sorting of copper wiring and other metals, reducing labor costs and improving material recovery rates by accurately detecting metallic objects at higher speeds and volumes compared to traditional inductive sensors.
Implementation Method 1
An inductive sensor consists of an induction loop. The inductance of the loop changes according to the types of material that pass inside it. Metallic materials are greater inductors than wood, plastic, or other materials typically found in a recycle waste stream.
Implementation Method 2
Eddy current separators create a field of energy around non-ferrous metals, which repels the non-ferrous metal.
Implementation Method 3
While ferrous and non-ferrous recycling has been automated for some time, mainly through the use of magnets
Data Source
Figure 1
Figure 2
Figure 3
AI summary
Processing metallic materials, such as copper, from waste materials. The systems and methods employ a dynamic sensor, which measures the rate of change of current generated by metallic objects that pass by the sensor to identify metallic objects in a waste stream. The dynamic sensor may be coupled to a computer system that controls a material diverter unit, which diverts the detected metallic objects for collection and possible further processing. The systems or methods may employ stages of sensors for sequential recovery of materials.