If the drying cylinders are sanded during an overhaul, they must also be rebalanced afterwards. Particularly in older drying sections whose drying cylinders are synchronized via gears, balancing an individual cylinder on site is very complex because the transfer gears have to be removed and each cylinder has to be driven independently.
In order to avoid this high level of effort, so-called coupled rigid balancing can be used for synchronously running rotors. Here, vibration sensors are applied to all bearing points in the drying section and the first order is recorded at operating speed.
Depending on the number of bearing points, tare runs must be carried out with different mass distributions in the balancing planes. Identical to balancing with 2 levels, this also results in a linear system of equations with a number of unknowns that corresponds to the number of balancing levels. By solving the system of equations, the size and position of the balancing masses can be calculated.
