Vibration isolation at the source – example of a mechanical press
Machine bearing – Why?
Industrial plants generate considerable vibrations that are transferred to floors, walls and ceilings. These are therefore perceived as disturbing not only in the immediate vicinity, but also at a greater distance. The transfer to neighbouring offices or – due to the growth of cities – to adjacent residential areas is particularly undesirable. At the same time, this vibration load can also cause damage to buildings or other machines. Here the well-known principle applies: constant dripping hollows out the stone.
How vibrations are transmitted
Noise from machines can reach the receiver directly through the air. Vibrations of the machine can also be transmitted to the building (so-called structure-borne sound) and thus be sensed or felt. At the same time, the components radiate the vibrations again elsewhere as airborne noise. This leads to an extensive impairment of the quality of life and work.
Polyurethane mats as a solution
Polyurethane (PUR) products from KRAIBURG have been used in vibration isolation for many years. There are two ways to do this:
The disturbing vibrations are only suppressed at the receiver. This may be necessary if the source of the interference is not or not sufficiently isolated. On the other hand, the insulation may only be required on a small area.
The vibrations are reduced here before they are transferred to the building. Structural changes in the environment are therefore not necessary.
Depending on the existing boundary conditions, one or the other variant can be aimed for. For various reasons, source insulation is particularly suitable for machines:
- The contact surface of the machine is usually comparatively small compared to the surfaces on which no disturbing vibrations are to occur.
- The solution is optimally adapted to the machine.
- The building is not exposed to harmful vibrations.
- Source insulation is usually cheaper than retrofitting the building and is also more flexible.
The design of the solution depends on various factors, including the geometry and weight of the machine. This means that bearing can be carried out under the machine in points or strips. A flat bearing or the insulation of only individual machine components can also be implemented.
Advantages of polyurethane products
- Favourable material
- Longer service life
- Can be cut to machine dimensions
- High insulation effect
- Low tuning frequencies
- Compensation of unevenness
- Easy to process, no maintenance
- Small sinking in
- Properties can be optimally adapted for application.
In contrast to rubber products, polyurethanes are characterized by significantly better insulation properties. This can also significantly reduce very low-frequency interference.