Spray Coating Gun Metering System for Quick-Drying Materials
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Solution Overview
Problem
Conventional spray coating guns are prone to faults when using quick-drying coating liquids, as the liquids can sediment on movable components, leading to unpredictable metering.
Innovation Solution
A spray coating apparatus that replaces the conventional liquid discharge valve with a metering system external to the gun body, using a metering pump to control the coating material flow, and incorporates a vortex tube cooler to prevent sedimentation by cooling the atomizer air, thus avoiding the need for a liquid valve and associated control air.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a liquid discharge valve with movable components is used to control coating material flow, then the metering of coating liquid can be adjusted, but the coating liquid can sediment on the movable components, causing the valve to become inoperative
Solution Approach 1:
The liquid discharge valve with movable components is completely removed from the spray gun. Instead, a diaphragm valve with a stationary needle seat is used, where the coating material flows over a stationary needle without movable parts that can clog. This extracts the problematic movable components from the system while maintaining metering control functionality.
Solution Approach 2:
The conventional mechanical liquid discharge valve is replaced with a diaphragm valve system that uses a stationary needle and flexible diaphragm. This substitution eliminates the movable valve body and needle assembly that were prone to sedimentation, replacing them with a design where only the stationary needle can be easily cleaned.
2Ease of operation
If a liquid discharge valve with control air chamber is used to open the valve, then the valve can be actuated, but the control air system becomes more complex
Solution Approach 1:
The control air chamber and associated control air system are completely removed from the spray gun design. The diaphragm valve is actuated directly without requiring a separate control air system, thereby extracting the complexity of the control air mechanism while maintaining valve actuation functionality.
3Productivity
If quick-drying coating liquids are sprayed, then high productivity is achieved, but the liquids sediment on gun components rapidly, causing faults
Solution Approach 1:
All movable components within the gun body that could accumulate quick-drying coating liquid are removed. The design uses only stationary components that can be easily cleaned, eliminating the reliability issue while maintaining high productivity with fast-drying materials.
Solution Approach 2:
The design accepts that quick-drying coating liquids will deposit on surfaces, but by making all surfaces stationary and easily accessible, the deposits can be quickly discarded through simple cleaning procedures rather than requiring complex valve disassembly and recovery procedures.
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 ensures reliable operation with quick-drying coatings by preventing sedimentation on gun components, simplifying the apparatus, reducing the need for control air, and lowering maintenance and operational costs.
Implementation Method 1
incorporates a vortex tube cooler to prevent sedimentation by cooling the atomizer air
Implementation Method 2
provide spray guns of this type with at least one electrode, which can be connected to a high DC voltage for the electrostatic charging of the coating liquid
Implementation Method 3
feed to the spray gun a compressed air as atomizing air, which positively influences the atomization of the coating liquid
Data Source
AI summary
In a spray coating apparatus having a spray coating gun with a gun body and a coating material tube, a nozzle provided at the front end of the coating material tube, the coating material tube extends from the nozzle at the front end of the coating material tube to a connection piece at the rear end of the coating material tube. A metering system which can be connected to the coating material tube by the connection piece is provided for setting the amount of coating material that is fed to the nozzle per unit of time.