Sifter Drum With Conical Body For Uniform Powder Distribution
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Solution Overview
Problem
Conventional sifters with a fixed diameter rotating shaft at the center of the sieving chamber lead to uneven powder distribution, excessive load on partial screen areas, reduced sieving efficiency, and accelerated screen deterioration due to localized powder accumulation and large pressure losses.
Innovation Solution
A sifter design featuring a hollow drum with a conical body and a larger diameter than the rotating shaft, where the drum is coaxially arranged with the sieve assembly, and rotating blades attached to the drum's outer circumference to homogeneously disperse powder and reduce pressure loss, ensuring uniform sieving and extended screen life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a fixed diameter rotating shaft is used at the center of the sieving chamber, then the structure is simple and easy to manufacture, but the powder distribution becomes uneven and sieving efficiency decreases
Solution Approach 1:
The rotating shaft is segmented into two distinct parts: a central shaft portion and a drum portion with a larger diameter. This segmentation allows each part to serve different functions - the central shaft provides structural support while the drum portion creates effective powder circulation, thereby improving sieving efficiency without overcomplicating the overall structure.
Solution Approach 2:
The invention transitions from a one-dimensional (single diameter) shaft to a two-dimensional structure by adding the drum portion with a larger diameter that extends radially outward. This dimensional change enables the shaft to occupy more space in the sieving chamber, improving powder distribution and circulation efficiency.
2Device complexity
If a fixed diameter rotating shaft is used, then the device complexity is low, but the screen area utilization becomes uneven and screen life decreases
Solution Approach 1:
The shaft is divided into a central shaft and a drum portion, allowing the drum to specifically address screen utilization issues by creating better powder circulation patterns, while the central shaft maintains structural simplicity.
Solution Approach 2:
The drum portion with its larger diameter proactively distributes powder more evenly across the screen surface before excessive accumulation can occur in any single area, thereby preventing premature screen deterioration and extending screen life.
3Quantity of substance
If a large sieving chamber space is provided, then the powder flow capacity is sufficient, but the pressure loss increases and air consumption increases
Solution Approach 1:
The drum portion extends radially outward to occupy more space within the existing sieving chamber volume, improving powder circulation and reducing the effective chamber volume. This reduces the air-powder mixture volume that needs to be processed, thereby reducing pressure loss and air consumption while maintaining powder flow capacity.
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 design enhances sieving efficiency by evenly distributing powder across the screen, reducing pressure loss, and extending the screen's lifespan while minimizing powder retention and separation issues in mixtures of varying grain sizes.
Implementation Method 1
a beater to push the material to be sifted from an inner area to an outer area of a sieving chamber
Implementation Method 2
said drum having a conical body to reduce a pressure loss
Data Source
Figure 1(a)~1(b)
Figure 2
Figure 3
AI summary
A sifter comprising: a receiver having a supply chamber; a sieve assembly having a sieving chamber coupled to the supply chamber; a rotator having a rotating shaft laterally arranged to pass through the supply chamber and the sieving chamber; a drum having a circular cross-section and having a larger diameter than the diameter of the rotating shaft, the drum being extended in at least space of the sieving chamber and arranged coaxially with the sieve; a cylindrical sieve located inside the sieving chamber and arranged coaxially with the rotating shaft; a stirring rotor located in an inner area of the sieving chamber inside the sieve comprising a rotating blade attached to the rotating shaft; an extraction member; and an outlet for discharging powder passing through the sieve from the inner area to the outer area.