Electrostatic Powder Coating Device with Radial Slits

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Solution Overview

Problem

Existing electrostatic coating devices require multiple guns or discs to coat all sides of artifacts efficiently, leading to increased costs and complexity, and larger booth sizes due to the need for extensive coating paths and rotation mechanisms.

Innovation Solution

An electrostatic powder coating device with a modular, shaped body housing internal chambers and slits for powder dispensing, allowing for efficient coating of all sides with a single device by modulating powder emission and electric charge through multiple internal chambers and slits, reducing the number of devices and booth size.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If multiple electrostatic coating guns are used to coat all sides of artifacts, then coating completeness is improved, but device quantity and cost increase

Engineering Contradiction:

Improvecoating completenessVSAvoidnumber of coating guns

Core Design Contradiction:

ReliabilityVSQuantity of substance

Solution Approach 1:

The coating device is segmented into multiple independent coating heads arranged around a central axis, each capable of coating different sides of the artifact. This allows a single integrated device to perform the function of multiple separate guns while maintaining complete side coverage.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Multiple coating functions are merged into a single integrated device with multiple coating heads that can operate simultaneously or sequentially. The device combines what would otherwise require multiple separate guns into one unified system, reducing the total number of devices needed.

Inventive Principle:

Principle #5Merging (Combining)

2Reliability

If artifact rotation is implemented to coat multiple sides, then coating completeness is improved, but device complexity and booth size increase

Engineering Contradiction:

Improvecoating completenessVSAvoidrotation mechanism complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

Instead of rotating the artifact to present different sides to a single coating gun, the invention inverts the approach by keeping the artifact stationary and rotating the coating heads around it. This eliminates the need for complex artifact rotation mechanisms while achieving the same coating completeness.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The coating heads act as intermediaries that can move independently around the artifact. Rather than moving the artifact itself through complex rotation mechanisms, the coating heads serve as mobile intermediaries that can access all sides of the stationary artifact.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Reliability

If multiple electrostatic coating discs are used to coat all sides of artifacts, then coating completeness is improved, but device quantity and booth extension increase

Engineering Contradiction:

Improvecoating completenessVSAvoidbooth extension

Core Design Contradiction:

ReliabilityVSLength of stationary object

Solution Approach 1:

The invention transitions from a linear arrangement of multiple discs along the transfer path to a radial arrangement of coating heads around a central axis. This dimensional change allows all coating heads to be positioned within a compact cylindrical volume rather than requiring extended linear space in the booth.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

The coating heads are nested around the central transfer axis in a radial configuration, similar to nested dolls. This compact nested arrangement allows multiple coating functions to be concentrated in a small radial space rather than requiring linear extension of the booth.

Inventive Principle:

Principle #7Nested doll (Nesting)

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

Enables effective coating of all sides of artifacts with a reduced number of devices and smaller booth space, allowing for easy adaptation and lower manufacturing costs while maintaining high reliability and efficiency.

Implementation Method 1

electrostatic powder coating device

Methodology Applied

Scientific EffectElectrostatic attraction: Electrostatics

Implementation Method 2

introducing pressurized air in the internal chamber

Methodology Applied

Scientific EffectFluidization: Fluidisation

Data Source

PatentUS20240307901A1Electrostatic powder coating device and related coating system

Publication Date: 2024.09.19 TRASMETAL

AI summary

An electrostatic powder coating device comprises a shaped body extending along a longitudinal axis and housing an internal chamber configured to contain a fluid bed of powder coating. A closing plate of the internal chamber comprises a first intake duct of a powder coating into the internal chamber and a second intake duct of pressurized air into the internal chamber. The shaped body comprises first and second elements extending along the longitudinal axis, the first element comprising a first surface defining a lower portion of the internal chamber, the second element comprising a second surface defining an upper portion of the internal chamber connected to the first element. The first and second elements each comprise respective peripheral edges facing each other to form slits putting the internal chamber in communication with the outside of the shaped body, a plurality of electrodes arranged at the slits and connected to voltage generators.