Lorünser - Customizable Hoisting and Hauling Pulleys
Lorünser offers a comprehensive range of hoisting and hauling pulleys designed to meet diverse operational needs, from simple cable pulleys to custom-engineered solutions. Their production process employs advanced CAD and FEM methodologies, ensuring optimal performance and reliability. The pulleys are primarily cast using permanent mould casting, yielding products with superior mechanical properties and precise dimensional accuracy. These pulleys can be fabricated from materials such as cast aluminium, wrought aluminium alloy, or steel, and weigh from a few grams to over 60 kilograms. Additionally, Lorünser provides companion parts, manufactured according to original blueprints archived for consistency. Special attention is given to the development of bearings and axles, offering maintenance-free options or relubrication-friendly designs. The pulleys feature protection from dust and water, further enhanced by advanced insert rings available in rubber, plastic, or Robalon, catering to various operational demands and ensuring the integrity of the cable and pulley structure.
Customized products
Depending on the customer’s specifications, Lorünser can offer a fast and market-driven solution for a wide range of parameters. It uses state-of-the-art manufacturing equipment and CAD or FEM processes to do this. In addition to new pulleys, it can also supply spare parts for older pulleys. They are made according to the original drawing in the Lorünser archive.
In one piece
Lorünser casts standard pulleys mainly in the mould; the bearing seats in the pulley body are surface-compacted. Depending on requirements, the flanged pulleys are made of cast aluminium, wrought aluminium alloy or steel.
Permanent mould casting is particularly suitable for medium to large runs. The moulded castings are used in a wide variety of applications. They can weigh from a few grammes to over 60 kilos. The advantage is that workpieces produced in this way have a finer and denser grain structure in contrast to the sand-casting process. The result: a product with better mechanical properties and greater dimensional accuracy.
Full steam ahead
Standard pulleys or special designs are available in different materials, sizes and bearing types depending on the application. Lorünser has developed special computer programs for designing the bearings and axles. At the customer’s request, it is possible to install maintenance-free sealed bearings or relubricatable bearings.
The pulleys are provided as standard with additional plastic or steel cover plates for protection against dust or water. The hardened and tempered axles are galvanized but can also be supplied in stainless steel.
Used in the harshest conditions
Lorünser offers different types and materials for pulley insert rings depending on the application and load.
Rubber
On the one hand, high-quality rubber compounds protect the cable, pulley, bearing and supporting structure. On the other hand, rubber insert rings ensure quiet running both mechanically and acoustically.
Plastic
Plastic insert rings are used specifically for extremely high loads.
Robalon
Side discs made of Robalon are used for special pulleys, such as inclined or curve pulleys. This protects the cable and the flanged pulley.