Flip-Flow Vibrating Screens are used to screen materials that are highly moist or sticky in nature, where circular motion or conventional mechanical vibrating screens fall short of meeting the operational requirements.

The BMPE flip-flow screen offers a versatile motion compared to alternative flip-flow technologies. The particle motion follows an elliptical path, creating a powerful “trampoline effect” across the screening media. Through this dynamic action, exceptionally high acceleration forces of up to 50g are achieved.

The flip-flow screen consists of two baskets (inner and outer) mounted on a common shaft. However, the center axes of these baskets are slightly offset, giving the inner basket a subtle eccentricity. The modular screen mats are made of high-quality polyurethane and are securely connected to the tie pipes of both the inner and outer baskets. As the screen shaft rotates, it causes the screen media to alternately stretch and compress at rapid intervals.

Both baskets feature two robust side plates fabricated from fully killed steel plates, connected by rectangular or hollow section (pipe) tie members. Additionally, both baskets are mounted on damping springs. This advanced design enables BMPE screens to efficiently process wet bulk materials containing a high percentage of fines or near-sized particles.

This screening technology is particularly suited for a wide range of demanding industries, including:

The machine consists of two distinct screen frames: an inner frame and an outer frame. These frames are driven to oscillate counter-currently by an eccentric shaft. The circular movement of the drive shaft is transformed into a precise oscillation of the screen frames via helical springs.

The outer screen frame is suspended from the inner frame by guide springs to allow controlled horizontal movement, while the inner screen case is securely supported by rubber-insulated springs. The crossbeams supporting the elastic screen mats are alternately connected to the inner and outer screen cases.

This relative movement between the frames changes the spacing between the crossbars, causing the screen mats to tension and detension 8 to 16 times per second. This rapid motion creates a high-energy “trampoline effect” for the screening mats, resulting in accelerations of up to 50g that effectively loosen, separate, and stratify the material.