"Slab
track for high-speed trains"
M2D laser scanners
are controlling precast concrete parts |
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| The
situation |
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For
the trackway of high speed trains, precast concrete parts with maximum accuracy
are needed. During concrete production, process-related tolerances of
some millimeters arise. To reach the required accuracy of 0,1 mm, the
precast parts have to be sized and possibly reworked. With the present,
tactile instruments, the complete measuring lasts 15 minutes. In the process,
the system achieves only a few measuring points.
The laser measurement is recording over 200 measuring points in less than
2 minutes.
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| Raw
part measurement |
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Once,
without stopping, the system runs over forth and back the pre-fabricated
part.
Two M2DF laser scanners are recording at a speed of 15 until 20 m/min.
(49 until 65 ft./min.) the entire concrete element. Thereby, all important
dimensions are entered and transmitted to CNC control unit.
On the following grinding, the measured data are serving as correction
values.
In proof of the required accuracy, a control survey is implemented after
grinding .
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| Double
control system |
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The system encloses a PLC and a
CNC unit. The PLC is responsible for the movement of the system (issuing
start and stop signals). For the exact positioning of the axes, for machining
and for measurement the CNC is responsible.
Therefore, the MEL sensor technology has to serve two interfaces at the
same time.
As online computer a MEL-i-Control,
industrial PC was installed. To PLC, there is a Profibus connection; the
time-critical start signals are send to i-Control by the fast digital
outputs of the PLC. The CNC gets data by file transfer via Ethernet.
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The MEL
software is running without mouse and monitor, the operation of the system
is fully controlled by CNC. For maintenance and parameter adjustments,
it is possible at any time to work with keyboard, mouse and monitor.
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Mechanical
integration
On grinding process, heavy water vortexes are generated in the environment
of the fast rotating grinding disks. Therefore, the laser scanners have
been protected with a pneumatically controlled protective lid, including
a compressed-air flushing unit.
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For over 20 years,
MEL is the most innovative producer of intelligent sensors. Take
advantage of our experience.
We cope with tasks of automation by using sensor technology and build
hard- and software as ideal solution. Alternatively, we deliver modular
solutions for integration into OEM projects.
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