What Is The Shape Of The Wobbler Feeder Screen Discs And Why
In numerous industrial fields such as mining, building materials, and coal, the Wobbler Feeder is a material pretreatment device responsible for material screening and classification. The screen tray directly contacts the material and performs the screening function. The shape design directly determines the screening efficiency, anti-clogging ability, applicable material types, and the final classification accuracy of the equipment. The requirements for material processing vary greatly under different working conditions, and there are also various designs of screen discs of different shapes.
The types and working principles of Wobbler Feeder Screen Discs shapes
The sieve plate of the Wobbler Feeder is composed of multiple sets of sieve shafts connected in series to form a screening working surface. The difference in the shape of the sieve plate will directly change the movement state, force conditions and dynamic change rules of the sieve hole gap of the material on the working surface, resulting in different screening performances.
Circular Discs
Shape characteristics
The circular sieve tray is the most fundamental and earliest applied shape type of Wobbler Feeder sieve tray. It presents a standard circular outline as a whole, and the diameter of the same sieve tray is uniform and consistent, without obvious concave and convex or long and short axis differences.
Working principle
The screening function of the circular screen tray is mainly achieved through two parameters – the diameter of the screen tray itself and the distance between the screen trays on adjacent screen shafts. When the screen shaft drives the screen disc to rotate at a constant speed, the circular screen disc will exert a thrust on the material, and the material will be conveyed at a constant speed along the screening working surface.
Applicable scenarios
The circular sieve disk Wobbler Feeder is suitable for scenarios with relatively high requirements for the accuracy of sorting particle size, such as the classification and screening of sand and gravel materials in the building materials industry. Due to its uniform surface force and relatively small wear, it is also more suitable for processing dry materials with low abrasiveness.
Elliptical Discs
Shape characteristics
Unlike the symmetrical structure of the circular screen plate, the elliptical screen plate has distinct long and short axes. The length ratio can be customized according to the different material properties and screening requirements, presenting an overall asymmetrical elliptical outline.
Working principle
When the screen shaft drives the elliptical screen ring to rotate, the long shaft and the short shaft alternately come into contact with the material, exerting a periodically changing force on it. When the long shaft comes into contact with the material, it will exert a pushing force on the material, causing it to lift upwards. When the short shaft comes into contact with the material, the lifting force decreases, and the material falls under the action of gravity. The rotation of the screen plate will also drive the materials to move laterally, thus forming a composite vibration that combines up and down and laterally. This can effectively break the adhesive force between the materials, and the bonded materials will loosen, avoiding the blockage of the screen holes.
Functional advantages
It enhances the flipping and rubbing effects of materials, effectively preventing fine materials from adhering to the surface of the screen tray and clogging the screen holes. It also increases the contact probability between materials and the screen surface, thereby improving the screening efficiency of the Wobbler Feeder.
Irregular/Polygonal Discs
Shape characteristics
Common types include triangular, square, pentagonal and other polygonal structures. The surface usually has obvious sharp corners, edges or protruding parts, and the structure is relatively complex. Some screen discs are also designed as variable-diameter or thickened structures according to requirements.
Working principle
When the screen rotates, the sharp corners, edges and protruding parts on its surface will exert a strong impact and shearing effect on the materials, which can break large pieces of materials into smaller particles, making them meet the screening requirements. For heavily viscous or materials with high mud content, impact and shearing can effectively break the bonding structure of the materials, separate the fine materials wrapped in the coarse materials, and at the same time prevent the materials from caking on the surface of the screen plate.
Functional advantages
It has the ability to break and loosen, and can effectively handle difficult-to-process materials that are hard to cope with by other shaped screen discs, such as heavy stickiness, large pieces, and high mud content.
Why the Shapes
Realize dynamic screening
The traditional fixed screen screening mainly relies on the gravity of the material to achieve one-dimensional falling screening, which has a low screening efficiency and is prone to clogging. The combination of the shape of the Wobbler Feeder’s sieve plate and the rotation mode of the sieve shaft enables dynamic screening. The shape of the screen plate directly determines the movement trajectory of the material. Combined with the synchronous or differential rotation of the screen shaft, it can transform the simple horizontal conveying movement of the material into three-dimensional flipping, jumping and rubbing movements. Every material particle can constantly change its position and posture on the screening working surface, ensuring that all particles have sufficient opportunities to come into contact with the gaps between the screen plates. This avoids the “missed screening” phenomenon caused by material accumulation, significantly enhancing the thoroughness and efficiency of screening.
Determine the size of the sieve holes
The circular screen discs have uniform diameters. During rotation, the gaps between adjacent screen discs remain consistent, enabling relatively precise fixed-size screening. Elliptical, triangular and other non-circular screen discs, due to the periodic changes in their contour dimensions, the gaps between adjacent screen discs will periodically expand and contract during rotation. The expansion of the gaps allows agglomerated materials to pass through, and the contraction of the gaps enables them to be squeezed and loose. This can also meet the screening requirements of materials of different particle sizes and improve the versatility of the equipment.
Improve the efficiency of material conveying
While the Wobbler Feeder is performing the screening function, it also needs to ensure that the materials can be conveyed forward stably and efficiently, avoiding the accumulation of materials on the working surface. Through the eccentric design of the shape of the screen plate or the optimization of the contour curve, a continuous helical thrust or directional thrust can be exerted on the material during the rotation of the screen plate.
The matching of shape and material properties
Shape selection of viscous materials
Sticky materials, such as wet clay and coal slime, tend to adhere and form lumps on the surface of the sieve tray, causing blockage of the sieve holes and affecting the screening efficiency. When handling such materials, the Wobbler Feeder needs to select a sieve tray shape that can generate strong vibration, impact or rubbing effects.
The up and down and lateral combined vibration generated by the elliptical screen plate can effectively break the adhesive force between materials, causing the materials adhering to the surface of the screen plate to fall off. The irregular-shaped screen plate, through the impact and shearing effect on the materials by its sharp corners and protruding parts, can directly break and loosen the agglomerated materials, while preventing the continuous adhesion of materials on the surface of the screen plate.
Shape selection for high-wear materials
High-wear materials, such as iron ore, granite, and emery, will cause intense friction and impact on the surface of the screen plate during the screening process, which can easily lead to wear and deformation of the screen plate and shorten the service life of the equipment. For this type of material, it is necessary to choose a screen plate shape with a simple structure and good wear resistance.
The symmetrical structure of the circular screen plate ensures uniform force distribution during rotation, avoiding stress concentration caused by complex structures and reducing the unevenness of wear. For highly abrasive materials, a thickened circular screen plate can also be selected. By increasing the thickness of the screen plate, its service life can be prolonged.
Conclusion
The different-shaped sieve discs of the Wobbler Feeder, in combination with the rotational movement of the sieve shaft, achieve different screening performances. In practical applications, the selection of the shape of the sieve plate needs to comprehensively consider multiple factors such as the viscosity, abrasiveness, particle size distribution of the material, and the requirements for screening accuracy.
