Tumbler screen design
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Tumbler screen design
In the belly Tumbler screen design, the upper weight of the motor shaft rotates in a plane near the center of mass of the assembly. Rotation of the upper eccentric weights creates horizontal vibration, which causes the material to move toward the perimeter of the screen cloth and increases the horizontal throw, resulting in faster discharge of oversized material.
With the Tumbler screen design, the rotation of the upper eccentric weight creates horizontal vibration, causing material to move through the screen fabric toward the perimeter. Increasing the upper eccentric mass increases the horizontal throw, resulting in faster discharge of oversized material. The lower eccentric weight rotates below the center of mass, creating a tilt in the screen, providing vibration in the vertical and tangential planes. This increases the vertical component of motion, encouraging material turnover on the screen surface, helping to ensure maximum undersized material passes through the screen. The vertical motion also minimizes blinding of the screen by “near-size” particles.
Rotation of the upper eccentric weight creates horizontal vibration, causing the material to move toward the perimeter of the screen cloth. Increasing the upper eccentric mass increases the horizontal throw, resulting in faster discharge of oversized material. The lower eccentric weight rotates below the center of mass, creating a tilt on the screen, providing vibration in the vertical and tangential planes. This increases the vertical component of motion, encouraging material turnover on the screen surface to help ensure maximum undersized material passes through the screen. Vertical motion also minimizes blinding of the screen by “near-size” particles.
In the belly Tumbler screen design, the tangential component of the movement is controlled by the lead angle given to the bottom weights relative to the top weight. The change in the lead angle controlled the spiral pattern of material movement over the screen cloth. The rate of advancement and flow pattern of the material over the screen cloth can be adjusted by the operator for maximum throughput and screening efficiency for any screenable product, whether wet or dry, coarse or fine, heavy or light, hot or cold.
Typical material passes through the screen rapidly on its journey to the perimeter. Oversized material is continuously discharged through a tangential outlet. Below is an animation of the belly Tumbler screen design working principle….
Features and benefits
✓ Low power consumption;
✓ Various fields of application;
✓ High efficiency per screen area;
✓ Accurate separation of up to 5 fractions;
✓ Different blinding prevention systems can be applied;
✓ Modular design allows easy cleaning and maintenance;
Tumbler screen design are equipped with a screening platform made of wire mesh or perforated plate on which the solids to be controlled are loaded. An unbalanced motor (or 2, depending on the design) mounted on the chassis sends a vibration to the screening table, allowing solids smaller than the mesh of the sieve to pass. This product is then directed to the next unit operation. Parts larger than the sieve size do not remain on the sieve or do not move towards a rejection outlet, thanks to the direction given to the vibration waves by the motor settings.
Frequently asked questions
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In addition to Carbon steel and Stainless steel equipment, we design and manufacture process equipment with different metallurgies such as Hastelloy, Alloy20 and Incoloy.
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