What is the Meaning of Flip Flow Screen
Flip flow screen
The flip screen screen is a device used for screening difficult-to-sieve materials such as fine, sticky, and wet substances (such as highly moisture-containing raw coal and coke with medium and fine particle sizes). Its design principle is to generate dual vibrations through a single drive, that is, through resonance, with one driver providing two vibrations: the linear vibration generated by the exciter driving the fixed frame and the vibration generated by the floating screen frame, which move relative to each other. Especially when the processed materials are prone to blocking the screen mesh, the Flip flow screen can achieve a very high screening efficiency with a relatively small screen area and ensure that the screen mesh does not get clogged. It is widely used in industries such as coal, power, coal chemical industry, metallurgy, and building materials.
The Flip flow screen has evolved from the traditional circular vibrating screen and adopts the dual vibration principle of basic vibration and additional vibration. The basic vibration is the circular vibration generated by the eccentric block rotating, and the additional vibration is the elliptical vibration driven by the basic vibration. The two vibrating masses vibrate relative to each other at the same frequency. Due to the installation of the vibrating screen surface at both ends on the fixed frame and the floating frame, the polyurethane screen surface continuously expands and contracts, thereby achieving a higher acceleration. The relative linear movement of the two vibrating masses is adjustable and can be adjusted according to different screening materials.
Screening problem
Pegging of wedge-shaped particles
Wedge-shaped or conical particles present in the material get stuck in the sieve holes during the screening process. Under the action of gravity and the squeezing force of the material, they form a tight fit with the sieve holes and cannot pass through the holes smoothly, nor can they be discharged from the normal sieve surface vibration. This results in sieve hole blockage.
Prevention measures
By optimizing the vibration system of the Flip flow screen, it is made capable of generating sufficient strong acceleration to shake the wedge-shaped particles stuck in the sieve holes. At the same time, the tension of the sieve surface is adjusted to enable the sieve surface to generate more powerful bouncing during vibration, helping the wedge-shaped particles to leave the sieve holes.
Fine wet material adhesion and blockage
When processing materials containing a large amount of fine particles and high moisture content, the fine particles will collide and squeeze with the edge of the sieve holes and other particles under the vibration effect of the sieve surface, gradually adhering to the periphery of the sieve holes and forming a viscous material layer, blocking the sieve holes and preventing the materials from passing normally, thereby affecting the screening efficiency.
Prevention measures
Use materials with excellent anti-adhesion properties such as polyurethane and rubber to make the screen panel, which has good elasticity and wear resistance, and can reduce the friction coefficient between the material and the sieve surface during the screening process, reducing the probability of fine wet materials adhering to the sieve surface.
Increase the vibration acceleration of the Flip flow screen, which will exert a strong inertial force on the materials on the sieve surface, disintegrating the agglomerated fine particles and restoring them to a dispersed state.
During the operation of the Flip flow screen, the screen panel will undergo periodic bending and reset movements driven by the vibration system. When the stress exceeds the strength limit of the adhered material, the adhered material will break and decompose into fine particles.
Advantages of the Flip flow screen
- The high-frequency oscillation of the screen surface can impart a 50g acceleration to the materials, effectively solving the screening of sticky and wet materials and ensuring that the screen holes are not clogged.
- The eccentric flywheel exciter with high reliability has a large bearing capacity and a long service life.
- The high-performance oscillating screen plate has good wear resistance and excellent physical properties, with a longer service life and better screening effect.
- It has strong adaptability to coal quality fluctuations and low operating costs.
- The high-elastic polyurethane screen plate has excellent wear resistance, with a designed service life of over 4000 hours. The screen plate is installed by pressing in and pulling out, making it convenient for screen plate replacement and maintenance.
- It has low noise and a design vibration isolation effect of over 97%.
- For the same screening area, the screening equipment requires less motor power.
- The screening efficiency can reach over 95%.
- The excitation intensity can reach 50g, which can solve the screening of sticky and fine materials.
- It adopts the eccentric flywheel single-axis inertial exciter. The bearing design of the exciter has a service life of over 20,000 hours. The excitation force of the exciter can be adjusted by adjusting the angle of the eccentric flywheel.
The structure of the Flip flow screen
Transmission device
The transmission device of the Flip flow screen usually includes a motor, belt or gearbox, which is connected to an eccentric shaft or crankshaft to generate the main vibration and provide power for the relative movement between the frames. During the operation of the Flip flow screen, the dual vibration principle is activated, applying linear force to make the material move along the screen.
Support structure
The support frame provides structural stability for the Flip flow screen, connects the screen to the base, and helps absorb vibrations to ensure the machine remains balanced during high-frequency operation.
Guiding spring
The guiding spring is used to guide the movement of the floating frame relative to the fixed frame, maintain alignment and control the direction of vibration, prevent irregular movement, and provide the necessary flexibility for the flipping action.
Box body
The main screen box or frame body, which accommodates the screen mesh panels and supports the internal components, is usually composed of a fixed outer frame and a floating inner frame. The box surrounds the screen mesh fabric and guides the material flow.
Spring
The integrated universal springs in the system are used for suspension and vibration isolation, which helps to reduce the overall machine vibration transmitted to the ground or supporting structure.
Spring push rods
These are push rods or connecting components with springs, used to achieve push-pull actions between the frames. For the alternating tension and relaxation on the screen pad that generates “push force”, thereby achieving the flipping flow effect.
Inclined base
The base supports the entire screen mesh at a certain angle (usually 15-30 degrees), and the inclination utilizes gravity to assist the material to move downward along the screen, thereby improving output and separation efficiency. Cover plate
A top cover that protects the internal components from dust, debris or environmental influences can help prevent material leakage and reduce noise.
Conclusion
The Flip flow screen effectively addresses the industry challenges of screen blockage and low efficiency by leveraging the dual vibration principle and high-performance components. Its durability, adaptability and energy-saving features make it an indispensable core equipment in heavy industries such as coal processing and metallurgy.
