Crible à vibrations linéaires

SIEBTECHNIK linear-motion screening machines are freely vibrating machines, that is, the vibration amplitude freely adjusts itself to suit the mass ratio of screen box and unbalance mass. Linear-motion screening machines are designed with a selectable steep (approx. 75°) or shallow (approx. 40°) throw angle and are therefore flexible with regard to the selection of the screen panel tilt, which ranges from upwards through horizontal to downwards. Examples are dewatering screens with an upwards tilt of between 3° and 5° and screening machines for classification that require a downwards tilt of up to approx. 40° (thin-layer screening).

Our HG (double unbalance gear units), DWS (dual-shaft screen) and HR (unbalance motors) series screening machines offer separation sizes of between 0.5 and 300 mm and a screen area of approx. 1 to approx. 60 m². These machines can be set up for a vibration amplitude of between 2 and 14 mm, depending on the product. The screen set-up can comprise between one and three screen decks.

Speed and vibration amplitude of the linear-motion screening machine can be varied specifically to suit the product and so ensure a lastingly perfect screening result.

The screen box is set up to hold lengthways or crossways tensioned screen panels or for level screen decks and naturally also for system screen cloths by different screen cloth manufacturers.

The screen box, consisting of side walls and cross-members, can withstand all static and dynamic forces. The vibration generating system is not arranged at the centre of gravity of the screen box. Double unbalance gear units or unbalance motors are mounted on a drive bridge. The important thing is that the resulting force direction runs through the centre of gravity. The same applies to the position of the two drive shafts on dual-shaft screening machines.

The linear-motion screening machine is driven by V-belt drive with intermediate transmission or by a direct drive with a universal joint shaft. Double unbalance gear units have an oil filling. Unbalance motors are grease-lubricated for life. Double shaft screens are optionally oil- or grease-lubricated.

The screen box is elastically supported against the substructure on 4 spring elements. Here different systems of helical compression springs, rubber buffers, vibration elements or air bellows are possible and, if required, combinable (hybrid suspension).

For dusty screened material we supply on request linear-motion screening machines with a dust cover or a closed dust protection box. Individually adapted screening aids in the form of beating devices or spraying systems are also available.

The robust construction using and combining standard component parts ensures high flexibility and customer-focused solutions, on the one hand, and, on the other, enables the construction of machines with low-maintenance running time and a long service life.

Les cribles à mouvement linéaire de SIEBTECHNIK sont des machines à vibration libre, c’est-à-dire que l’amplitude de vibration s’ajuste librement en fonction du rapport de masse entre le caisson de criblage et le balourd. Les cribles à mouvement linéaire sont conçus avec un angle de projection sélectionnable, raide (environ 75°) ou faible (environ 40°), et sont donc flexibles en ce qui concerne le choix de l’inclinaison du panneau de criblage, qui va du haut vers le bas en passant par l’horizontale. Les essoreurs ont une inclinaison vers le haut comprise entre 3° et 5° et les cribles de classification qui nécessitent une inclinaison vers le bas pouvant aller jusqu’à environ 40° (criblage en couche mince) en sont des exemples.

Nos cribles de la série HG (réducteurs à double balourd), DWS (crible à double arbre) et HR (moteurs à balourd) offrent des tailles de séparation comprises entre 0,5 et 300 mm et une surface de criblage d’environ 1 à 60 m². Ces machines peuvent être réglées pour une amplitude de vibration comprise entre 2 et 14 mm, en fonction du produit. La configuration du tamis peut comprendre entre un et trois étages de tamisage.

La vitesse et l’amplitude de vibration du crible à mouvement linéaire peuvent être adaptées au produit et garantissent ainsi un résultat de criblage parfait.

Le caisson de criblage est conçu pour recevoir des panneaux de criblage à tension longitudinale ou transversale ou pour des étages de criblage plats et, bien entendu, pour des toiles de criblage de différents fabricants.

Le caisson de criblage, composé de parois latérales et de traverses, peut résister à toutes les forces statiques et dynamiques. Le système générateur de vibrations n’est pas disposé au centre de gravité du caisson de criblage. Des réducteurs à double balourd ou des moteurs à balourd sont montés sur un pont d’entraînement. L’important est que la direction de la force résultante passe par le centre de gravité. Il en va de même pour la position des deux arbres d’entraînement sur les cribles à double arbre.

Le crible à mouvement linéaire est entraîné par un entraînement à courroie trapézoïdale avec transmission intermédiaire ou par un entraînement direct avec un arbre à cardan. Les réducteurs à double balourd ont un remplissage d’huile. Les moteurs à balourds sont lubrifiés à vie à la graisse. Les cribles à double arbre sont au choix lubrifiés à l’huile ou à la graisse.

Le caisson du crible est soutenu élastiquement contre la sous-structure par 4 éléments à ressort. Différents systèmes de ressorts de compression hélicoïdaux, de tampons en caoutchouc, d’éléments vibrants ou de soufflets d’air sont possibles et, si nécessaire, combinables (suspension hybride).

Pour les matériaux à tamiser poussiéreux, nous fournissons sur demande des cribles à mouvement linéaire avec un capotage anti-poussière ou un caisson de protection fermé.

La construction robuste utilisant et combinant des composants standards garantit d’une part une grande flexibilité et des solutions adaptées aux besoins du client, et d’autre part, permet la construction de machines nécessitant peu d’entretien et ayant une longue durée de vie.

Low-pressure dewatering screening machine

To meet a strong demand for low residual moisture

To meet especial demand for low residual moisture in e.g. sand, our low-pressure dewatering screening machine is an interesting alternative. It delivers lower residual moisture levels than linear-motion screening machines that are usually used for dewatering. This machine is based on the “dual-shaft screening machine” drive concept, because with this kind of vibration generation higher speeds can be reached. Higher speeds combined with a pneumatic low-pressure system have a marked lowering effect on residual moisture levels.

Advantages of our low-pressure dewatering screening machine:

• Customer-specific concept
• High dewatering performance
• Screen cloth to suit the screened material
• Low-clog dewatering
• Excellent vibration insulation
• Robust design
• Long-life time-tested components
• Optimally adapted drive concept
• Low-maintenance and repair-friendly

Hot standard screening machine

Hot-asphalt screening machine by SIEBTECHNIK TEMA with improved dust guard

For the manufacture of standard asphalt-bound base and surface layers stationary, semi-mobile or mobile asphalt mixing systems are employed. These consist essentially of a dry drum, bucket conveyor, screening machine, aggregate silos, weighing and mixing equipment and a shipment loading system.

The aggregates, which make up about 80 to 90 per cent by weight of the asphalt formulation, are heated to the required temperatures in the burner-heated dry drum. The quality of the asphalt layer depends on, amongst other things, the quality of the binding materials and the correct grain composition of the largest component by volume, the grainy aggregates. For this reason the screening machine is of especial importance

The SIEBTECHNIK TEMA type HN screening machine has the advantage that the drive mounting is positioned outside the fixed dust guard enclosure and so outside the heating zone. Hot chippings at temperatures of up to 450 °C have been reliably screened with this system in numerous applications.

Here the right choice of screen cloth and the kind of screen cloth tensioning is also important.

The excellent accessibility of the machines in combination with dust guard covers that enable temperatures to be rapidly lowered are an important requirement for short down-times in cases of maintenance or repair. The dust guard available since 2001 in the new, split version with fully extendable chute carrier brings a further improvement on earlier systems here.

Advantages of our hot standard screening machine:

• Customer-specific concept
• Temperature resistance of the components
• Drive system, screen box and screen cloth to suit the screened material
• Compact design
• Low-clog classification
• Excellent vibration insulation
• Robust design
• Long-life time-tested components
• Optimally adapted drive concept
• Low-maintenance and repair-friendly

Screening machines for the most varied applications have formed part of our production range for many years.

Even if your screening problems seem unsolvable, you should consult us. A well-trained team of engineers and almost 100 years’ industry-specific experience are at your service.

There is a comprehensive range of accessories available for all SIEBTECHNIK TEMA screening machines. Whether it’s a spraying system, wear protection, counter-vibration frame, air suspension, dust guard, dust covers, drive consoles, double unbalance gear units, hybrid suspension or special screen cloths – thanks to its decades of experience SIEBTECHNIK TEMA gets you the best result for your requirement

Naturally our machines can be perfectly combined and offer the optimum solution as a package.

Ask us, we’re there for you.