Plant engineering and construction
PRINTING INDUSTRY / ADJUSTMENT OF STANDS AND PRINTING CYLINDERS
A modern multi-color printing system consists of several separate units, one unit per primary color. To achieve high-quality print products, these units must be precisely aligned and adjusted when assembled.
Each single color unit provides horizontal and/or vertical reference faces, which must be used during the manufacturing process in the production plant as well as for the adjustment of the printing line. The positions of the reference faces must be adjusted in accordance to each other, measured, and a record must be printed. The positions of the printing cylinders must be precisely aligned to each other (horizontally).
POWER SUPPLY SECTOR / ALIGNMENT OF LARGE PUMP SHAFTS
During maintenance works on the pumps of the cooling circuit of a cooling tower in nuclear power plants, quick and precise methods for the required alignment works are indispensable. Large electro motors with vertical axis drive evenly large centrifugal pumps situated one floor below.
- The horizontal positions of the connecting lines between the bearing faces on the bearing ring for the stator must be checked. The flatness and the horizontal position of the bearing ring must be assured.
- The pump housing, one floor below, must be adjusted horizontally as well.
- The center points of the pump shaft and the drive shaft of the motor must be aligned to each other in order to assure that the transmission shaft can work free of any bending moment.
MONITORING OF A HIGH RACK WAREHOUSE
Automatic high rack warehouses can reach very large dimensions:
80 m length, 45 m width and 30 m height are no exceptions. Despite these dimensions and despite the high speed of the transportation system, each bin must be placed very accurately at its predefined location. In order to reach such accuracy, the alignment of the racks is of key importance. The exact verticality of each rack has therefore to be ensured. Already smallest deviations will change the distance to the transportation system and could cause errors. The bins could get blocked and get damaged or even fall.
Measuring task / Goal:
The verticality of each rack in the high rack warehouse must be monitored permanently.
POSITIONING OF A HEAVY PART WITH AN OVERHEAD CRANE
In a large production hall, a heavy part shall be positioned in the correct height with an overhead crane in order to allow a stress-free mounting. First tests show that the building is not stable enough: Depending on the weight of the part, vertical offsets are measured which are larger than the required positioning
In order to achieve the required accuracy, the bending of thebuilding respectively of the overhead crane should be measured.From these values, the vertical correction of the crane should be calculated.
ADJUSTMENT OF A CEMENT OVEN DRIVE
Cement is manufactured in a so-called turn-tube oven. The oven itself is a about 50 to 70 m long, slightly tilted steel tube with a diameter of 4 to 5 m which turns around its longitudinal axis (max. 20 rpm).
The inclination of the cement-oven drive- gear wheel (diameter approx. 1.5 m) should be the same as the inclination of the turn-tube oven gear wheel (diameter approx. 6 m). The required accuracy is 0.01° = 0.2 mm/m.
CONTROLLED CRADLE TO LIFT AND PLACE PAYLOAD FAIRING OF A ROCKET
The payload fairing covers the goods transported and provides aerodynamic to the leading end of the rocket. As the payload fairing is a highly complex unit, no scratches or even dents are acceptable. To lift and to position the payload fairing a cradle is used.
The balancing and weight distribution cross at the head of the cradle should be monitored in both axes. Deviation from horizontal alignment must be visualized at the cranes control panel.
Thresholds are defined regarding misalignment. Overshooting these limits must activate an alarm and disrupt the lifting actions.
ZEROTRONIC SENSORS IN STRONG MAGNETIC FIELDS
Measuring task / Goal:
The user of a particle accelerator would like to accurately measure and adjust the parts of his accelerator. The strong magnetic fields allow only the use of non-magnetic material. Only instruments that are not sensitive to heavy magnetic fields can be used.
MONITORING OF SYNCHROTRONS
Synchrotrons require a very accurate long-term monitoring of the alignment and the inclination of the girders carrying the electromagnets.
All girders must be monitored continuously. To achieve a high precision with this measuring task, an excellent long-term stability of the sensors is decisive.