Optical Powder Flow Detection via Light Intensity Analysis
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Solution Overview
Problem
Existing powder coating material application systems face challenges in accurately detecting flow/no flow conditions and changes in flow rate, leading to potential waste and inefficiencies in the coating process.
Innovation Solution
A method and apparatus utilizing a light source and detector to analyze light intensity through a transparent portion of the powder flow path, determining changes in flow rate by calculating average values of time-variant output signals, and generating alarms for flow rate changes or no flow conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional powder coating systems are used without advanced detection, then the system structure remains simple, but the ability to detect flow conditions and flow rate changes is insufficient leading to waste and inefficiency
Solution Approach 1:
The patent replaces complex mechanical flow detection mechanisms with an optical detection system. A light source emits light through the transparent portion of the powder flow path, and a light detector measures light intensity to determine flow conditions. This optical substitution provides precise flow detection without the mechanical complexity of traditional sensors, resolving the contradiction between measurement precision and device complexity.
Solution Approach 2:
The patent introduces a transparent portion in the powder flow path as an intermediary element that allows optical interaction between the light source and light detector. This intermediary enables accurate flow measurement while keeping the detection system relatively simple, as the transparent portion facilitates light transmission without requiring complex sensor assemblies.
2Reliability
If real-time flow monitoring is implemented, then coating process quality improves, but the system complexity and cost increase
Solution Approach 1:
The patent implements a feedback mechanism where the light detector continuously monitors light intensity and generates signals indicating flow conditions and flow rate changes. This feedback is processed by a controller that can trigger alarms or adjust the coating process in real-time, ensuring consistent coating quality. The feedback loop provides reliable monitoring while maintaining relatively simple system architecture through straightforward optical-to-electrical signal conversion.
Solution Approach 2:
The patent replaces complex mechanical monitoring systems with an optical-based real-time monitoring solution. The light source and light detector provide continuous flow information without mechanical moving parts, reducing system complexity while improving reliability for coating process consistency.
3Loss of substance
If no flow detection system is used, then the system remains simple and cost-effective, but powder waste occurs due to undetected flow issues
Solution Approach 1:
The patent uses an optical detection system instead of complex mechanical sensors to detect flow conditions and prevent powder waste. The light-based detection method provides sufficient information to identify flow problems without the complexity of mechanical flow meters or sensors, achieving waste reduction with minimal added complexity.
Solution Approach 2:
The transparent portion of the powder flow path serves as an intermediary that enables optical detection of flow conditions. This simple structural modification allows the system to detect flow issues and prevent powder waste without requiring complex detection apparatus.
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 solution enables real-time monitoring of powder flow, reducing waste by alerting operators to flow issues and ensuring consistent coating processes, thereby improving efficiency and quality.
Implementation Method 1
directing, by a light source, a light into said portion of said powder flow path; detecting, by a light detector, intensity of light that passes through said portion of said powder flow path
Data Source
Figure 1
Figure 2~3
Figure 4A~4C
AI summary
Apparatus for detecting powder flow along a powder flow path includes a light source and a light detector for detecting light from the light source directed across the powder flow path as powder flows through said powder flow path. A circuit receives the output from the light detector and determines an average or RMS of the signal received by the light detector. The circuit may determine whether there is flow or no flow of powder or whether there is a change in flow rate of powder. Preferably, the apparatus is used in combination with a dense phase powder pump, which causes the powder to flow in pulses from the pump outlet into the powder flow path. More preferably, the light source and detector are enclosed in a housing that is connected between the pump outlet and a powder feed hose which supplies powder to a spray gun or hopper.