Metering Feeder Scraper Segmentation for Powder Accuracy
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Solution Overview
Problem
Existing metering feeders for powder/granular materials face issues with accuracy in small supply due to 'dripping' and retention, especially when rotating speed is lowered, and insufficient filling in the discharge groove.
Innovation Solution
A metering feeder with a vertically-movable scraper for large supply and a fixed small scraper for small supply, along with a recessed portion and loosening rod, ensures accurate metering by preventing retention and improving filling efficiency through controlled discharge and return mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the rotating speed of the rotating disc is lowered for small supply, then the final supply amount can be adjusted, but dripping of the powder/granular material occurs
Solution Approach 1:
The single discharge scraper is divided into two separate scrapers: a vertically-movable scraper for large supply and a fixed small scraper for small supply. This segmentation allows each scraper to be optimized for its specific function, with the fixed small scraper preventing dripping during low-speed operation while the vertically-movable scraper handles bulk material discharge.
Solution Approach 2:
The vertically-movable scraper can change its position dynamically between a lowered position (for large supply) and a raised position (for small supply). This dynamic adjustment allows the system to adapt to different supply requirements, enabling the fixed small scraper to function properly during small supply operations without interference.
2Device complexity
If a single discharge scraper is used, then the device structure is simple, but retention of powder/granular material occurs on the return side of the rotating disc
Solution Approach 1:
The discharge function is segmented between two scrapers with different configurations. The fixed small scraper is positioned to prevent retention on the return side by maintaining continuous contact with the discharge groove, while the vertically-movable scraper handles the bulk discharge. This segmentation of functions eliminates the retention problem without requiring a completely complex system.
3Measurement precision
If the rotating speed is reduced for accurate small supply, then supply precision improves, but filling efficiency of the discharge groove decreases
Solution Approach 1:
The recessed portion is provided in the discharge groove to pre-position and accumulate powder/granular material before the discharge刮per acts on it. This preliminary accumulation ensures that even at reduced rotating speeds, the discharge groove remains adequately filled, maintaining filling efficiency while allowing for precise control during small supply operations.
Data Source
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AI summary
The present invention is a metering feeder provided with the following: an annular transport space (5) formed by an outer cylinder (2), an inner cylinder (1), and a bottom plate (4); a central rotating blade (7) provided on a rotating shaft in the center of the bottom plate (4); an outer rotating ring (8) connected to the tip of the central rotating blade (7); a plurality of outer rotating blades (9) provided on the outer rotating ring (8) so as to point inwards; and a rotating disc (10) in which a powder/granular-material discharge groove (17) is formed, the top surface of said rotating disc (10) lying in the same plane as the top surface of the bottom plate (4). The outer rotating blades (9) scrape the powder/granular material in the annular transport space (5) into the powder/granular-material discharge groove (17), which transports said powder/granular material outside the outer cylinder (2). This metering feeder is further provided with a vertically-movable scraper (18) for supplying large amounts of the powder/granular material and a fixed small scraper (19) for supplying small amounts thereof. Said scrapers block the flow of the powder/granular material in the powder/granular-material discharge groove (17) in the rotating disc (10) and guide same to a discharge opening (13). This configuration makes it possible to increase the precision with which the powder/granular material is supplied.