Powder Supply Device with Chamber Segmentation for Doctor Blade Load Reduction
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Solution Overview
Problem
Existing powder supply devices face challenges in quantitative powder dispensing due to the load applied to the doctor blade, which can cause it to curve, leading to excessive powder discharge.
Innovation Solution
A powder supply device design featuring a storage tank with a partition member that restricts the opening between two chambers, where the powder is charged into one chamber and transferred to another where the doctor blade is located, reducing the load on the blade and allowing for controlled powder discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the doctor blade is used to scrape powder from the spray roller, then powder supply is achieved, but the doctor blade may curve due to load and cause excessive powder discharge
Solution Approach 1:
The internal space is divided into a first chamber for charging powder and a second chamber for the doctor blade operation. This segmentation separates the powder storage function from the powder scraping function, reducing the load on the doctor blade and preventing curvature while maintaining quantitative supply precision.
Solution Approach 2:
A restricting portion is introduced as an intermediary element between the first chamber and second chamber. This restricting portion controls the powder flow from the first chamber to the second chamber, ensuring that the doctor blade receives an appropriate amount of powder without excessive load, thus preventing curvature and maintaining precise quantitative supply.
2Productivity
If the spray roller rotates to supply powder, then powder discharge is achieved, but the doctor blade becomes curved under powder load
Solution Approach 1:
By dividing the internal space into separate chambers, the system isolates the powder discharge function from the doctor blade function. The first chamber holds powder while the second chamber contains the doctor blade, preventing direct contact between excessive powder load and the blade, thereby maintaining its straight shape.
Solution Approach 2:
The restricting portion acts as a mediator that regulates powder flow to the doctor blade area. It ensures only a controlled amount of powder reaches the doctor blade, preventing the blade from bending under excessive load while still allowing continuous powder discharge through the rotating spray roller.
3Quantity of substance
If powder is stored in the storage tank, then powder supply is enabled, but excessive powder accumulates and increases doctor blade load
Solution Approach 1:
The storage tank is segmented into two functional chambers: the first chamber for bulk powder storage and the second chamber for the doctor blade operation area. This segmentation limits the amount of powder that can accumulate near the doctor blade, reducing the force load on the blade while maintaining adequate powder supply capability.
Solution Approach 2:
The restricting portion serves as a flow control intermediary between the powder storage chamber and the doctor blade chamber. It regulates the powder flow rate, ensuring that powder is supplied at a controlled rate that prevents excessive accumulation and reduces the force load on the doctor blade while maintaining continuous supply.
Data Source
AI summary
Provided is a powder supply device including a storage tank in which an internal space that stores powder and a discharge port that discharges the powder from the internal space to outside are formed, a roller that has an outer peripheral surface formed of a rough surface and is rotatably provided, in the discharge port, to face both the internal space and the outside, and a doctor blade that is provided at the discharge port and faces the outer peripheral surface of the roller. The internal space includes a first chamber into which the powder is charged and a second chamber in which the doctor blade is disposed. The first chamber communicates with the second chamber via an opening. A partition member that restricts the width of the opening is provided between the first chamber and the second chamber. The powder charged into the first chamber moves to the second chamber through the opening.