Powder Dosing Device with Movable Body and Segmented Cavities
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Solution Overview
Problem
Existing powder coating devices lack the ability to adjust powder discharge rates accurately across a wide range, and require minimum air flow speeds to function properly, limiting their adaptability to various coating applications.
Innovation Solution
A dosing device with a movable dosing body and open dosing cavities, where the powder discharge rate is adjustable by varying the relative speed of the dosing body and using a scraper to control the powder layer thickness, allowing for precise adaptation to different coating requirements without minimum air flow constraints.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional powder coating device is used, then the device can operate with simple structure, but the powder discharge rate cannot be adjusted accurately across a wide range
Solution Approach 1:
The dosing body is segmented into multiple dosing cavities that can be independently filled and emptied. Each cavity acts as a discrete dosing unit, allowing precise control of powder discharge. The segmentation enables the system to achieve accurate dosing across a wide range by controlling which cavities are active and their fill states.
Solution Approach 2:
The dosing body is made movable relative to the housing, allowing dynamic adjustment of the powder discharge rate. By varying the relative speed between the dosing body and housing, the system can precisely control the amount of powder discharged per unit time, achieving both high accuracy and wide adjustability from less than 50 g/h to over 2000 g/h.
2Reliability
If minimum air flow speed is required for operation, then the device can maintain stable powder flow, but the adaptability to different coating applications is limited
Solution Approach 1:
The dosing cavities self-regulate the powder flow through their controlled filling and emptying cycles. The system does not rely on minimum air flow speeds to maintain stability, as the cavities inherently control powder release timing and quantity. This self-service mechanism ensures reliable operation across varying air flow conditions and different coating applications.
3Manufacturing precision
If the inlet is precisely positioned for accurate dosing, then the dosing accuracy is improved, but the device complexity increases
Solution Approach 1:
The dosing cavities are pre-filled with powder before the dosing cycle begins. This preliminary filling action eliminates the need for complex inlet positioning during operation, as the cavities are already prepared with the required powder quantities. The scraper then simply needs to level the surface, simplifying the overall inlet configuration while maintaining high dosing accuracy.
4Quantity of substance
If the scraper leaves a powder layer on the dosing area, then more powder is available for discharge, but the dosing precision is reduced
Solution Approach 1:
The scraper creates a differentiated powder distribution: it removes excess powder from certain areas while leaving a controlled layer in specific zones where additional powder quantity is needed. This local quality variation allows the system to maintain precision in critical dosing areas while ensuring sufficient powder availability in areas requiring higher quantities, optimizing both precision and quantity simultaneously.
Data Source
AI summary
A dosing device for powder has an inlet and an outlet for powder. A dosing disc rotatable from inlet to outlet has a dosing area of sintered material, which is provided with cavities for the volumetric dosing of the powder. A dosing body having open dosing cavities is provided which is movable from the inlet and outlet. By changing the speed of rotation of the dosing disc the quantity of powder to be discharged can be set in a wide range.