A sieve bend, also known as a curved screen, plays a crucial role in coal preparation plants and ore dressing plants for pre-dewatering, desliming, and grading operations, as well as for recovering coal mud. It can also work in conjunction with a hydrocyclone to effectively classify, dewater, deslime, and desilt fine-grained materials. Industries such as papermaking, water treatment, and coal preparation frequently use sieve bends.
Maintenance Methods for Sieve Bend:
The typical maintenance for a stationary sieve bend system involves rotating and replacing the curved screen surface. However, some other components also require periodic replacement, such as the screen surface fixation system, the counterweight system, and related feed gate parts, as well as the repositioning and rotation of the wear-resistant lining support components fixed on the feed end and discharge end of the sieve box. The replacement of key components of the curved screen, such as the screen surface support device, the base rotation system, and the feed box rotation system.
Assembly, Replacement, and Rotation of Sieve Bend:
The metal wires on the sieve surface, specially designed and woven, have sharp cutting edges in the opposite direction of material flow. These sharp cutting edges (noticeable when moving your fingers vertically on the sieve surface) facilitate cutting moisture from the flowing material on the sieve surface. Each sieve surface features arrows indicating the correct direction of material flow. The sieve bend must be installed in the direction indicated by the arrows, away from the feed box, or the screen surface will not function correctly.
The decision of when to replace the screen surface depends on the experience level with the specific product. After a certain period of use, the initial cutting edges of the sieve bars may become dull, reducing the efficiency of the sieve surface. When the initial cutting edges are dull, rotating the sieve box to reverse the direction of material flow on the sieve surface will restore its original effectiveness. Sieve surfaces may undergo several rotations before replacement is necessary.
Before rotating the sieve surface, it is necessary to conduct a thorough inspection to ensure that one side is not dulled while the other remains sharp, as premature rotation can diminish the effectiveness of the sieve surface. When checking the sieve surface, use your fingers to move vertically from top to bottom and then from bottom to top. If the upper edge feels dull while the lower edge is sharp during the upward movement, it’s time to rotate the sieve box to change the direction of material flow relative to the sieve surface. If the lower edge feels dull and the upper edge is sharp during the downward movement, rotating the sieve box is not necessary.