Ultrasonic vibrating screen is one of the most important equipment for 3D printing powder screening. Its simple structure and stable work are widely used in powder-related industries. For the ultrasonic vibrating screen, the most important thing is the screening efficiency. Improving the screening efficiency can greatly increase the yield rate and reduce the fluctuation between powder batches. There are many factors that affect the screening efficiency. This article takes die steel as an example to analyze the influence of the feed rate on the efficiency of ultrasonic vibration screening.
With the increase of the feed rate, the sieving completion time gradually decreases, the weight of the +105μm particle size segment continues to increase, and the particle size of the 45-105μm segment continues to decrease. Although the feed rate was increased, the intensity of the screen vibration did not increase, and the height and intensity of the material being thrown remained unchanged. The increase of the feeding speed makes the feeding amount increase, but when the material exceeds a certain amount, the material layer is too thick, the material particles are not easy to loosen, and the sieve holes are blocked, and the particles on the upper part of the material layer are difficult to pass through the sieve holes. Therefore, the particle size of +150μm The weight of the segment has increased significantly. With the increase of the feed rate, the weight of the 45-105μm, 15-53μm and -25μm particle size segments decreased. As the material passing through the upper screen is reduced, the weight of the corresponding remaining particle size segments will also be correspondingly reduced.
As the feed rate increases, the powder particle size D10 value continues to increase, and the D90 value continues to decrease. When the frequency exceeds a certain value, both D10 and D90 have exceeded the range of qualified product particle size requirements. The increase of the feed rate increases the probability of collision between materials. The agglomerated particles are knocked apart into small particles. The particles are easier to loosen, and the large and small particles are more likely to be stratified. However, the increase in the feed rate will also cause the screen to block the screen. The material with larger particles is blocked by the upper screen, and the particle size of the particles passing through the screen becomes finer.
In summary, when the feed rate is small, the screening time is longer and the screening efficiency is low. As the feed rate increases, the time to complete the screening gradually decreases. However, when the electric feeding speed exceeds a certain value, the particle size values D10 and D90 both exceed the specified range value.
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