Vibrating Powder Squeegee Layout for Uniform Coating Weight
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Solution Overview
Problem
Conventional powder coating methods result in variations in coating weight due to uneven powder layer structures, particularly when a sinusoidal standing wave shape is formed, which affects the uniformity and quality of the coating.
Innovation Solution
A powder coating device with a drive device, a powder supply device, and multiple squeegees that vibrate at a natural frequency between 2 kHz to 300 kHz, where the squeegees are positioned to adjust the powder thickness and weight uniformly, with the second squeegee shifted by a quarter wavelength from the first squeegee along the width direction, ensuring even coating weight distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a single squeegee vibrates at natural frequency to improve powder fluidity, then powder clogging is prevented, but the powder layer develops sinusoidal standing wave unevenness affecting coating uniformity
Solution Approach 1:
The single squeegee is divided into multiple squeegees (first squeegee and second squeegee) arranged in sequence. Each squeegee independently vibrates at its natural frequency to prevent powder clogging, while their combined action eliminates sinusoidal standing waves. The first squeegee frequency is set to 2-300 kHz and the second to 1-200 kHz, with their respective sinusoidal patterns offset by quarter-wavelength to achieve uniform coating.
Solution Approach 2:
Different vibration frequencies are applied to different squeegees to resolve the contradiction. The first squeegee operates at 2-300 kHz and the second at 1-200 kHz, creating different sinusoidal standing wave patterns. This parameter differentiation allows each squeegee to effectively fluidize powder while the combined effect cancels out unevenness, achieving both good fluidity and uniform coating.
2Productivity
If high frequency vibration is applied to squeegee to improve powder fluidity, then coating without powder clogging is realized, but powder layer unevenness increases due to sinusoidal standing wave
Solution Approach 1:
The coating process is segmented into multiple stages with separate squeegees. The first squeegee (2-300 kHz) and second squeegee (1-200 kHz) each contribute to powder fluidity at different frequency ranges, maintaining high coating efficiency while their combined action eliminates the harmful sinusoidal standing wave effect that would otherwise degrade powder layer uniformity.
Solution Approach 2:
The system uses a composite vibration approach where multiple squeegees with different natural frequencies work together. This composite action combines the benefits of high-frequency vibration for powder fluidity while the frequency differentiation and quarter-wavelength offset cancel out the sinusoidal standing wave pattern, achieving both productivity and precision.
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 solution effectively reduces variations in coating weight and enhances the uniformity and quality of the powder layer, preventing powder clogging and improving fluidity, resulting in a high-quality, environmentally friendly coating process.
Implementation Method 1
the first squeegee and the second squeegee vibrate at a natural frequency at a frequency from 2 kHz to 300 kHz inclusive
Implementation Method 2
squeegee 26 vibrates at high frequency in the vicinity of the ultrasonic band (a frequency from 2 kHz to 300 kHz inclusive)
Implementation Method 3
the vibration is transmitted to powder 23 to improve the fluidity of powder 23
Implementation Method 4
the second squeegee is shifted from the first squeegee by a quarter wavelength of the natural frequency along a width direction of the powder supplied to the surface of the member
Data Source
AI summary
A powder coating device includes first-stage squeegee (11) and second-stage squeegee (12) that adjust a thickness of supplied powder (3), in which first-stage squeegee (11) and second-stage squeegee (12) vibrate at a natural frequency at a frequency from 2 kHz to 300 kHz inclusive, and second-stage squeegee (12) is shifted from first-stage squeegee (11) by a quarter wavelength of the natural frequency in a width direction of powder (3) supplied to a surface of sheet (4).