The flip flop screen is a new type of screening equipment. Its uniqueness lies in the dual vibration principle, that is, a single drive generates dual vibrations, with one driver providing two vibrations.
The linear vibration generated by the vibration exciter fixed frame is the basic vibration, and the vibration generated by the floating screen frame is the additional vibration. The two vibrate relative to each other.
The two ends of the elastic polyurethane screen surface are respectively installed on the crossbeam of the fixed frame and the crossbeam of the floating frame. During the screening process, the polyurethane screen surface continuously expands and contracts (more than 800 times per minute) to obtain a very high vibration intensity (50g), which is more conducive to the loosening, stratification, and screening of the materials.

The flip flop screen, also known as the crank and link flip flop screen, operating principle as follows:

Two eccentric wheels with a 180° phase difference enable the screen frames of the system to perform a clear linear reciprocating motion. This means that the crossbeams of the two systems also perform this motion, causing the clamped screen plates to alternately tension and release. This tensioning and releasing action makes the screen mesh, which is mounted across the machine's cross-section, produce a trampoline-like motion, and this is the characteristic feature of the mechanical flip-flow screening machine. The screen mesh's elasticity, resilience, and high wear resistance are key features. The screening machine operates at a low rotational speed, generating a stress of only about 2-3G acceleration. However, the dual - system drive allows the screen panels to achieve a much higher acceleration of approximately 50G.

According to the pre-tension of the screen plate, the acceleration transmitted to the material screening can reach 50G or more. After the screen mesh is finely processed, the pre-tension is adjustable within a certain range.

Flip Flop Screen Structure

The screening machine mainly consists of a combined screening body (screen frame, flexible screen plate, crank transmission device, end transmission, motor, motor support, screening body support, vibration-damping springs, sealing cover, etc.).

The screen frame is connected by enhanced carbon fiber elastic elements provided by a German manufacturer. These elastic elements remain intact even after millions of reciprocating deflections.

The reciprocating distance between the components is determined by the inherent characteristics of the equipment and does not change with the load size of the screening machine. Therefore, the stability of this type of screening machine is an unparalleled advantage compared to other types of flip flop screens

Flip Flop Screen Structure

Box

Transmission Device

Support Guide Spring

Screen Mesh

Thrust Rod Spring

01/ High Screening Efficiency

The high acceleration causes the screened materials to be thoroughly loosened and separated quickly. Compared with conventional screening machines, a greater amount of fine particles can reach the sieve opening. As a result, the sieve hole through rate of the screened material is high, and the bouncy effect reduces the particle carrying of some of the materials on the sieve surface.

02/ Stable Screening

The inner and outer screen frames are driven by the eccentric shaft for forced movement. The distance of their mutual movement is determined by the design characteristics of the screening machine. The distance of mutual movement between the inner and outer screen frames is not affected by external factors such as the material. Therefore, their screening characteristics remain constant under any working conditions, and the screening effect is always excellent.

03/ No Blockage Of Sieve Holes

The constant flexing of the elastic sieve plate prevents particle adhesion. The extension of the sieve plate causes a slight change in the opening of the sieve holes in the tension direction, which can be described as the "breathing" of the sieve holes. Combined with high acceleration force, it prevents particles close to the size of the sieve holes from blocking the sieve holes.

04/ Low Speed With High Reliability

Compared to the rotational speed of traditional screening machines, the mechanical flip flop screen has a running speed of less than 600 rpm. The screening machine itself generates stress with only about 2-3G of acceleration. Therefore, the screening machine itself will have higher reliability. Both theoretical design and practical verification have proved that products of the same type have achieved industrial durability verification.

05/ No Impact On Foundation

The rubber springs supporting the screening machine only bear the weight of the screening machine in the vertical direction during operation. In the inclined installation direction, they bear the inertial force of the screening machine. However, the low rotational speed characteristic of the screening machine results in no vertical impact on the foundation, reducing the load requirements for the foundation and minimizing additional investment.

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Flip Flop Screen Applications

Flip flop screen is used in coal, mining operations, aggregate production, metallurgy, transportation, power industry, suitable for dry and wet screening of materials.

Processes:
Dewatering Screening	Fine Removal/Desliming
Dry Classification	Discharge Screening
Wet Screening	Secondary Screening
Fine wet Screening	Tertiary Screening
Material:
Coal	Sand	Anthracite
Coal Coke	Gravel	Ashes
Coal Gangue	Shale	Basalt
Lignite	Slag	Rumble
Gold	Gypsum	Recovered Glass
Copper	Diamond	Mixed Construction
Bauxite	Rare Earth......

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Flip Flop Screen On Site

Applications in the coal chemical industry : It resolves technical challenges in fine screening for industries with ultra-high - capacity, such as the coal chemical industry, where the screening radius is 12mm. In cases where over 90% of the material is retained on the screen in ultra-high-capacity screening, it has been applied at Henan Yima Gasification and Xinjiang Guanghui New Energy, successfully solving screening tasks that vibratory Flip flop screen couldn't accomplish.

Applications in the coal industry: It solves the technical challenges of screening fine, moist, and sticky coal particles. With a screening range as small as 3mm, it has been applied at State energy Group's Wanli No.1 Mine and Lijiahao Coal Mine. This equipment is capable of handling sticky and fine coal particles, offering a high screening efficiency and precision that post-screening equipment cannot match.

Other industrial applications: In industries like aggregates and nonferrous metals, especially in the aggregates industry, screening 3 - 5mm moist and sticky materials remains a challenge. The application of mechanical Flip flop screen will resolve this industry issue and promote its development.

A high quality mechanical products, must have excellent tooling equipment. In order to ensure its accuracy and meet the needs of large orders. Henan Excellent Machinery Co.,Ltd owns 140 sets of professional equipment, including Five-axis Gantry Machining-center, CNC Boring And Milling Machining Center, Vertical Machining Center, Vertical CNC Machining Center, Gantry Machining Center, Laser Cutting Machine, Laser Pipe Cutting Machine, Welding Robot Workstation, Lengthen Lathe, CNC Horizontal Machining Center, etc. Advanced processing and manufacturing equipment including Environmental Spraying Room and Heat Trea equipment and ultra large Surface Heat Treatment.

Left And Right Side Plate Blanking Process

Mineral Sizers Front And Rear End Cover Machining Process

Front And Rear End Cover processing

Mineral Sizers Left And Right Side Plate Machining Process

Left And Right Side Plate processing

Mineral Sizers Teeth Ring Internal Surface Machining Process

Teeth Ring Internal Surface processing

Teeth Base Processing

Teeth Roller Heat Treatment

At present, EXCT has fully passed ISO9001-2008 international quality system certification, complete quality system make sure that from the product development and design, production, procurement and supply to sales and service process has been effective quality controlled.

EXCT has a rigorous and skilled inspection team to ensure the success of product quality control. The quality inspection department has a strict testing process that runs through the stages of raw material procurement, production, and installation to ensure that every piece of equipment delivered to customers is qualified.

Mineral Sizers Currency Test When Running

Current Detection

Voltage Detection

Shaft Temperature Detection

Vibration Detection

Noise Detection

Ultrasonic Flaw Detection

Hardness Detection

Coating Thickness Detection

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EXCT flip flop screen are customized for each application material to provide the best configuration and meet all your requirements. For more configurations please contact our technical engineers.

Model	*Screen Spec WL (m)**	Screen Area (㎡)	Meshsize(mm)	Inclination Angle Of Screen Surface (°)	Feed Size (mm)	Power (KW)	Handling Capacity (t/h )
MFF2.0-6.30	2.0X6.3	12.6	3－13	20－30	≤80	22	150－400
2MFF2.0-6.30	2.0X6.3	25.2	Upper screen 14－30 Lower screen 3－13	20－30	≤80	37	350－650
MFF2.2-7.56	2.2X7.56	16.6	3－13	20－30	≤80	37	250－500
2MFF2.2-7.56	2.2×7.56	33.2	Upper screen 14－30 Lower screen 3－13	20－30	≤80	45	450－750
MFF2.2-8.82	2.2×8.82	19.4	3－13	20－30	≤80	37	250－600
2MFF2.2-8.82	2.2×8.82	38.8	Upper screen 14－30 Lower screen 3－13	20－30	≤80	45	500－900
MFF2.6-8.82	2.6X8.82	22.9	3－13	20－30	≤100	37	350－750
2MFF2.6-8.82	2.6×8.82	45.8	Upper screen 14－30 Lower screen 3－13	20－30	≤100	45	650－1100
MFF3.0-8.82	3.0X8.82	26.4	3－13	20－30	≤100	45	400－950
2MFF3.0-8.82	3.0X8.82	52.8	Upper screen 14－30 Lower screen 3－13	20－30	≤100	75	800－1400