During high-precision screening, material blockage of the screen is the most common and difficult problem. Blockage can lead to a sharp drop in screening efficiency, reduced output, unstable product quality, and even frequent machine downtime for cleaning, severely impacting production efficiency.
The Rotary Vibrating Sieve, through its unique design and dynamic principles, offers multiple mechanisms to effectively address this challenge.
Coreal Machinery has compiled some information for your reference.
I. Methods for Blockage Prevention in Rotary Vibrating Sieve Screening
1. Composite Screen Cleaning System: Some Rotary Vibrating Sieve systems integrate elastic rubber balls and ultrasonic oscillators beneath the screen. The rubber balls vibrate with the machine, striking the screen approximately 120 times per minute, removing surface debris. The ultrasonic waves create microscopic vibrations in the screen, preventing fine particles from adhering due to van der Waals forces, providing dual protection and reducing blockage.
2. Optimized Material Distribution: The Rotary Vibrating Sieve utilizes eccentric weights at the upper and lower ends of the vertical vibrating motor to convert rotary motion into a combination of horizontal, vertical, and tilted motions. Adjusting the 45° phase angle creates a spiral diffusion path for the material, achieving over 90% screen surface utilization. Compared to linear vibrating screens, material distribution uniformity is approximately 2.3 times greater, and screen blockage caused by localized accumulation is reduced by 80%.
3. Improved Screen Structure: Some Rotary Vibrating Sieve systems incorporate a cavity within the screen mesh and incorporate bouncing balls. The cavity is a hollow, closed polygonal cylinder with minimal clearance between the bouncing balls and the sides. When the screen mesh vibrates, the bouncing balls bounce within the cavity at a higher frequency than the equipment's vibration frequency, effectively dislodging particles near the separation point within the sieve mesh near the cavity, thus preventing screen blockage.
4. Use a sealed mesh: The Rotary Vibrating Sieve utilizes a mother-and-child mesh structure, secured with special clamping rings. This seal creates a gap of less than 0.1mm, preventing material from seeping into the frame gaps and forming hardened aggregates that can cause screen blockage. This reduces screen blockages caused by material accumulation from three times per week to zero, and also extends screen life.
II. How to Select the Suitable Rotary Vibrating Sieve for High-Precision Anti-Blocking Screening?
1. Identify Material Characteristics: Material particle size, moisture content, viscosity, electrostatic effects, specific gravity, and other factors form the basis for selecting an anti-blocking solution.
2. Select a Vibration Mode: Standard three-dimensional vibration is suitable for most slightly sticky materials. If the risk of screen blockage is high, a model equipped with a bouncing ball system is preferred.
3. Consider an Ultrasonic System: For extremely fine materials, those with static electricity, or those containing a slight amount of oil or moisture, a Rotary Vibrating Sieve equipped with an ultrasonic cleaning system is strongly recommended. While the initial investment is higher, it completely eliminates screen blockage issues and offers significant returns in terms of increased production and quality.
4. Choose the right screen: Select a high-quality screen with a smooth surface and precise pore size.
5. Equipment Material: If the material is corrosive or requires food or pharmaceutical grade, be sure to choose SUS304 or 316L stainless steel.
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