The operation of an Archimedean screw is based on the difference between friction and sliding. The product rubs inside the tube as it slides on the spiral. The friction is greater than the sliding, the product moves linearly.
Our Archimedean screw conveyors are specially adapted to transport, extract and dosing of dry bulk products, non-volatile, and come with many options and variations according to the type of products and the working environment.
An Archimedean screw is mainly composed of:
- A shaft
- A tubular sheath or trough
- From a spiral shaft
- A rotor
The screw length will essentially depend on their diameters. ISERCO screws start from Ø 20 mm with 500 mm up to 800 mm in length. They can be up to 10 m long (without intermediate bearing).
Although its design is very old (Archimedes), the screw is an extremely complex mechanical element working “full powder”. In some configurations, the screws meet the ATEX and Food Contact criteria.
The ISERCO design of ARCHIMEDEAN screws minimizes any mechanical component in the product. Thus, the intermediate bearings do not exist in our products.
Screws can be used in very high temperatures justifying external cooling (water jacket).
In some cases (dosing), the screws can be vibrated.
ISERCO offers a Tubular sheath or trough as spare parts in case of need.
This tubular sheath or trough “imprisons the shaft” so that the product can move inside. The inside part of the sheath is also subject to frictions and then wear. The wear will depend on the conditions of use and do not require preventive replacement. However, we recommend that both the shaft and sheath are always kept in stock.
There are on the market many kinds of shaft manufacturing (continuous welds, rolled spiral or constant thickness). The shaft spiral allows the movement of a powder in a closed chamber using friction. There is always wearing on spire tops. The wearing of the shafts spiral depends on their uses. Their replacement will be immediately realized as soon as a loss of flow capacity will be noticed. Shaft spirals are made upon demand according to their specific side. That’s why we suggest keeping spare parts available near the workplace.