EN. then explain the motion of particles inside the separator and how to adjust the weights to Efficiency is the percentage of on-specification materials extracted from incoming feed materials during the screening process. If a screen is delaminating or separating into layers on the tension ring, this could indicate a temperature issue. A third option, which is a mix between the slider self-cleaning kit and the ball tray, is the self-cleaning screen, shown in Figure 5. © Copyright 2020 | CSC Publishing Inc. All Rights Reserved. The new "E-Z Slide" Unbalanced Weight System design (patent applied for) will make adjustments simple. However, before calling in an expert, there are a few corrective actions you can consider to make sure the machine is set up correctly or at least within its standard parameters, which could potentially fix the issue. Premature screen failure, screen blinding, and irregular material movement are a few of the most conventional — and easily fixable — issues that separators experience. To minimize the risk of screen failure at the center of the screen, there are a few things that should be checked. Feeding material onto the screen off-center will also affect how the However, keeping the Screen Tips - Volume 9, Number 1 Spring, 1994. The effect of the input control parameters: top weight force, bottom weight force and lead angle are defined to create an understanding of vibration generation. This high capacity vibrating circular screener industrial separator is highly used in industrial screener grading applications in numerous industries, such as food, metallurgy, ceramic, chemical, pharmaceutical, powder coatings and others. The lead angle is the most important factor in what determines materials pattern on the screen surface. When the separator vibrates, the ball bearings bounce and hit the ring’s interior surfaces, resulting in secondary vibrations rippling out to the screen area closest to it, which assists the material there through. When this occurs, the screen’s center is flooded with material, and the weight of the material compromises the integrity of the mesh, causing the screen to tear or wear out. The vibrating rim cleaner is better for cleaning synthetic screens that are easily damaged by sliders and balls; however, since the secondary vibrations ripple out from the edge, they unfortunately only clean a 2-inch area around the screen’s outer edge. The preceding information was just a few tricks of the trade to look out for when your vibratory separator equipment isn’t performing optimally, although it doesn’t cover all scenarios. information discussed here in mind will help you be better prepared to For the majority of applications, the lead is set at between 60° and 120° . Find more information on this topic in articles listed under “Screening and classifying” in the article archive. Making these eccentric weight adjustments in traditional machines took considerable time. material moves on the screen. The lead angle is adjusted at  the bottom weight assembly and can be set at an angle anywhere between 0 to 120  degrees. An incorrect lead angle is the likeliest cause of center congregation. The lead angle is the number of degrees separating the motor shaft’s bottom weight assembly resultant force and the top weight assembly resultant force. Here we’ll discuss these issues, what causes them, and how to resolve them. If the weight around the separator’s perimeter is not evenly distributed, the material pattern will be affected. angle lead graduated adjustment Separators Work which causes material to move Basically, the SWECO Separa- across the screen cloth to the tor is a screening device that vibrates periphery. A self-cleaning screen is comprised of a working mesh on top of the tension ring with a coarser mesh (support screen) attached to the bottom of the ring. Many separator problems can be easily fixed with simple adjustments or changes to the machine’s components. Depending on your process needs, it might be beneficial to invest in one or more specialty or customized screens to fit the application of the materials being processed. separator in the center of the screen. Also, bristles from the brush can fall into the material stream and contaminate it, so the bristles must be cleaned intermittently. If, how-ever, a different flow pattern is desired, the lead angle of the lower weight may be changed without damage to the motor. Typically, circular vibratory screen separator operators adjust upper and lower eccentric weights as well as the lead angle between the eccentrics to achieve the best screening efficiency for the material. The center of the separator screen is another focal point for premature failure. Lead Other miscellaneous factors. Ultrasonic system maintenance includes replacing the transducer on the tension ring during screen replacement, which can be costly. Elastic balls, like the ones in Figure 4, are placed on a coarse screen, which is then mounted two inches below the sizing screen. Delamination. As the name suggests, vibratory separators separate bulk materials by particle size; however, as the equipment ages and experiences wear and tear, you may find yourself running into issues with the machine. However, there are other factors Custom Advanced Connections Sifter Separator DM18S33WC. When a percentage of the material is close in size to the screen mesh hole aperture size, that material tends to get lodged in the holes; this material is referred to as near-size. pattern. Opposite of the bottom-side self-cleaning kits are top-side self-cleaning kits. A higher lead angle will produce a more spiral pattern on the screen, resulting in longer material retention time. To fix an incorrect lead angle, the weight settings and lead angle need to be adjusted to move the materials off the screen. The relatively inexpensive necklace ring dam requires minimal maintenance and provides material yield similar to that of a larger machine. efficiency don’t suffer. These resolutions help limit the stress on the mesh from the added weight of the material feed. Article: Optimizing Vibratory Screen Separator Performance. Another issue that vibratory separator operators experience is that material on the screen moves in an irregular direction or not at all during processing.