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If the motor is running clockwise or the weights are moving right to left, the motor rotation is wrong, and the motor leads will need to be reversed in the control box. Also, bristles from the brush can fall into the material stream and contaminate it, so the bristles must be cleaned intermittently. This screen type isn’t always an option for food and other sanitary applications, so be sure to speak with the screen manufacturer to find out about other options; however, these same issues can occur with differing screen types. If you’re experiencing a problem with oversized-material discharge, adjust the lead angle on the bottom weight assembly to assist in facilitating material discharge. If working with a larger screen that uses a center tie-down, ensure that the tie-down is holding the screen level. Get the latest Food Manufacturing trends delivered FREE to your inbox! An incorrect lead angle is the likeliest cause of center congregation. The Ranger Separator™ is a high performance round industrial vibratory separator designed to improve products quality. These devices are primarily designed for use in dry powder applications to break up materials while assisting them through the screen. The separator’s vibrations cause the rings to move quietly around the screen, giving larger particles more opportunities to pass through the screen. While quiet in operation and useful in high-accuracy screening applications, the ultrasonic system is 10 to 20 times the cost of sliders and balls. 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. He holds a BA in marketing and an MBA, both from Northern Kentucky University in Highland Heights, KY. Jeff has more than 27 years of experience with bulk solids processing equipment. Keep in mind that general advice is no substitute for having the separator manufacturer’s experts come on-site to diagnose and resolve a separator problem in person. This device is made up of a perforated plate mounted below the screen surface with sliders placed between the perforated plate and the working mesh. Several screen cleaners or antiblinding devices are available to counter screen blinding, and they come at a reasonable cost. The pH level of the materials being processed also needs to be taken into account, as it affects the screen. Most of the time, troubleshooting can help solve these concerns. Top-side self-cleaning devices provide a lightweight scrubbing action on the screen’s surface to keep dry materials from sticking to the wires and improve material yield through the screen. Irregular material movements can be due to any number of problems, and it Near-size materials tend to lodge in the screen’s mesh holes, blinding the screen mesh and prohibiting additional materials from passing through the screen, as shown in Figure 1. The center of the separator screen is another focal point for premature failure. This article discusses different concerns associated with vibratory separators, the cause of the issues, and solutions for remedying these challenges. You’ll need to replace any problematic springs immediately, which can be easily done through the separator’s manufacturer. Additional screen-cleaning devices. Lead angle and motor rotation. lead angle adjustment Vibro-Energy® Separators - Interior View 0 Lead – Material is thrown straight and gives insufficient separation 15 Lead – Material begins to spiral 35 Lead – Gives material maximum efficient screening pattern 90 Lead – Keeps oversize material from being discharged and assists in receiving maximum throughput Sweco • Florence, KY800-807-9326 • www.sweco.com. The necklace ring dam is made up of plastic rings linked together via a stainless steel or polyurethane cord; aligned at the separator screen’s periphery, this configuration forms a dam or one large ring. Ultrasonic system maintenance includes replacing the transducer on the tension ring during screen replacement, which can be costly. Linguee. 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. If materials are running in the opposite direction of how they usually run on the screen, check the rotation of the motor. 3. Here we’ll discuss these issues, what causes them, and how to resolve them. Practical guidelines are introduced for weight 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. Some limits are as low as 120ºF (49ºC) while others are as high as 200ºF (93ºC). One of the most common problems that operators face with their vibratory separator is premature screen failure. parameter measurements techniques for: horizontal motion, vertical motion, and phase The lower weight acts to about its center of mass. Blinding primarily occurs in one of two ways. 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. There are several ways that a separator screen becomes blinded, but there are also several ways to counteract this issue. If this happens, the screen mesh will wear at that point, leading to breakage. Vibratory separator screens are considered a wear item in that they’ll eventually wear out and need replacing. obtain the optimum vibratory motions. Top-side self-cleaning kits are less commonly used than bottom-side cleaners and are typically used when standard sliders or balls won’t work. An incorrect lead angle is the likeliest cause of center congregation. These features are especially helpful for processors that use the same unit for different applications that may require frequent amplitude adjustments. Also, make sure the center tie-down assembly is tightened properly. 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. Also, because the sliders and balls bounce off a mesh screen instead of a perforated plate like the self-cleaning kit uses, the self-cleaning screen runs at a much lower decibel level than the self-cleaning kit, so it is more tolerable during operation; however, it is still recommended that you wear hearing protection while operating the cleaners. The assembly should only be tightened after the exterior clamp ring assembly is seated and fully torqued. Owning and operating a vibratory separator is generally a smooth experience…until it’s not. It’s imperative that oversized materials discharge properly. If the material temperature exceeds the screen’s limit, the epoxy will begin to weaken and fail, causing the screen to delaminate. This new eccentric weight adjustment system, as the saying goes, requires "no tools, no talent and almost no time" Yet "E-Z Slide" Unbalanced Weight System (patent applied for) is effective and cannot be shaken out of position by machine lurching during shutdown. The separator vibrates in action, which causes the balls to bounce against the working mesh’s screen underside, dislodging any near-size materials. There are many possible causes for premature screen failure. Kason engineers have designed a new system for adjusting the unbalanced weights which produce vibratory motion on the VIBROSCREEN circular screen separator.
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