Electrostatic Spray Tip Recess Design for Pin Cleaning
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Solution Overview
Problem
Electrostatic spray tools face inefficiencies due to material accumulation on charging pins, which disrupts the electric field and leads to inconsistent coating application, as the charged material does not completely transfer from the spray tip to the target surface.
Innovation Solution
The electrostatic spray system incorporates recesses in the air cap to prevent material buildup on charging pins, ensuring they remain free from stray particles and maintain effective charging, utilizing a combination of air atomization and electric field generation to ensure consistent coating application without frequent air cap changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If material is sprayed using electrostatic charging, then coating efficiency is improved, but material accumulates on the spray tip blocking the electric field
Solution Approach 1:
The harmful accumulation of charged material on the spray tip is prevented by extracting or removing the charged particles from the vicinity of the spray tip using a grounded finger or rod, which is moved across the distal surface to discharge accumulated material
Solution Approach 2:
A grounded finger or rod serves as an intermediary element between the charged spray tip and the grounded target, providing a controlled path for discharging accumulated material and maintaining electric field consistency
2Productivity
If charged material is sprayed toward a grounded target, then material adheres to the target surface, but incomplete transfer causes material to stick to the spray tip
Solution Approach 1:
The system performs self-maintenance by using a grounded finger or rod to periodically discharge and remove accumulated material from the spray tip, allowing continuous operation without frequent cleaning or replacement of the spray tip
3Productivity
If the electric field is used to charge material, then coating application is enhanced, but material accumulation blocks the electric field production
Solution Approach 1:
The grounded finger or rod is periodically moved across the distal surface of the spray tip during or between spraying operations to continuously discharge and remove accumulated material, ensuring the electric field remains consistent throughout operation
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 allows for continuous spraying without material accumulation on charging pins, enhancing the consistency and efficiency of material transfer to the target surface, thereby improving the overall coating process by maintaining a stable electric field and reducing material waste.
Implementation Method 1
The first and second conductive members are configured to help generate an electric field in the region downstream from the first outlet
Implementation Method 2
the material is charged when it leaves a spray tip of the electrostatic tool and travels toward the object, which is grounded
Implementation Method 3
a spray tip assembly configured to receive a coating material and an airflow to atomize and charge the coating material
Data Source
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AI summary
An electrostatic spray system (8) includes an electrostatic tool, a spray tip assembly (22) configured to receive a coating material, and an airflow to atomize and charge the coating material, and spray the coating material in an airflow direction. The spray tip assembly (22) includes a first air cap horn having a recess in a first distal surface, a first charging pin (106) disposed within the recess, and a grounded pin (90) coupled to the spray tip assembly (22). The first charging pin (106) and the grounded pin (90) are configured to produce an electric field that charges the coating material.