The SIEBTECHNIK TEMA banana screening machine is used for screening granular bulk materials. It is driven either by double unbalance gears (type BHG), circular vibratory drives (type BV) or by unbalance motors (type BHR).
Our banana screening machine achieves good separation efficiency at extremely high feed rates and with difficult-to-screen material. Its operating behavior is similar to that of a high-speed screen. Compared to conventional vibrating screens, the banana screen can handle a much larger feed rate with a constant screening surface.
We manufacture single and multi-deck geared screens. Different gearbox sizes enable excellent adaptation to your individual application. The balancing masses and speeds can be adjusted in stages. This allows the linear vibration amplitude and acceleration of the screen box to be optimally adapted to the process engineering requirements.
Our SIEBTECHNIK TEMA gearboxes are quick and easy to install and offer high availability of the screening machine.
We recommend this drive concept, for example, for classifying a feed material with a high proportion of undersized particles.
The drive concept of this banana screening machine is based on the proven vibration generation of our circular vibration screening machine.
A bearing-mounted drive shaft with imbalances is driven in rotation. The resulting movement of the screen box is therefore circular – as with a conventional circular vibrating screen.
We recommend this drive concept, for example, for control screening of fine sand to protect against probable oversize particles.
A drive with one or two unbalance motors can be an economical alternative to the double unbalance gearbox or the design with one or two drive shafts – mainly in the area of narrow nominal widths. The resulting movement of the screen box is therefore either linear or circular.
These rather smaller banana vibrating screens are used, for example, in the classification of sand, chippings or in recycling.
SIEBTECHNIK TEMA banana screening machines are free-swinging machines, which means that the diameter of the oscillating circuit is freely adjustable according to the mass ratio of the screen box and the unbalance. Banana screening machines can be designed with a steep (approx. 75°) or flat (approx. 40°) throw angle. This flexibility makes it possible to realize different screen bottom inclinations in one screening machine, from steeply sloping (approx. 40°) to horizontal to slightly ascending (approx. 5°).
Examples are combined classifying and dewatering screens in the salt sector (thin-layer screening with subsequent dewatering).
Our banana screening machines are high-speed screens in terms of their operating behavior. Due to the steep inclination of the screen bottom, a high transport speed is achieved.
A very thin layer is formed, with most of the fines being screened out by the long meshes. The screen inclination decreases in the middle and outlet sections, which reduces the transport speed. In this part, a good separation of boundary particles takes place.
For example, the screen bottom inclination can be 25° to 40° in the steep section, 15° to 25° in the middle section and 0° to 15° or even + 5° in the flat section. The number of inclination steps and their angle can be determined individually as required (e.g. in the event of restrictions due to existing steel structures).
Our screening machines in the BHG (double unbalance gearbox), BV (circular vibrating screen) and BHR (unbalance motors) series offer separation sizes from 0.5 to 150 mm and a screening surface of approx. 1 to approx. 40 m². Depending on the product, the machines can be designed for a vibration amplitude of 2 – 14 mm. The screen structure can comprise between one and two screen decks.
The speed and oscillation width of the banana screening machine can be varied to suit the specific product, thus ensuring a consistently perfect screening result.
The screen box is designed to accommodate either longitudinally tensioned screen panels or flat screen panels and, of course, system screen panels from different screen panel manufacturers.
The screen box, consisting of side walls and cross beams, absorbs all static and dynamic forces. The vibration generation is located in the center of gravity of the circular vibration variant. In contrast, double unbalance gearboxes or unbalance motors mounted on a drive bridge are not located in the center of gravity of the screen box. It is important that the resulting direction of force action passes through the center of gravity.
The banana screening machine is driven by a V-belt drive with primary reduction gear or by a direct drive using a cardan shaft. The double unbalance gears are oil-filled. The unbalance motors have lifetime grease lubrication. Circular vibrating screens are optionally lubricated with oil or grease.
The screen box is elastically supported against the substructure on 4 spring elements. Various systems of spiral compression springs, rubber buffers, vibration elements or air bellows are possible and can be combined if required (hybrid suspension).
For dusty screening material, we can supply screening machines with a dust hood or a closed dust protection box on request. Screening aids in the form of knocking devices or spray nozzles are also available as an option and can be customized.
The robust design using and combining standard components ensures a high degree of flexibility and customer-oriented solutions on the one hand, and on the other hand produces machines with low-maintenance running times and a long service life.
Screening machines for a wide range of applications have been part of our production program for many years.
Even for seemingly unsolvable screening problems, you should contact us. A well-trained team of engineers and more than 100 years of industry experience are at your disposal.
Here you will find an overview of our extensive range of screening machine accessories, e.g. atomization, wear protection, drive consoles, air suspension, counter-swing frame, dust protection, double imbalance gearbox, hybrid suspension or special screen linings.
The elliptical vibrating screen combines the advantages of linear and circular vibrating screens with space-saving horizontal installation and high material throughput.
A SIEBTECHNIK circular motion screening machine is the classic solution for process engineering tasks in screen classification.
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