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ment consists of concrete silos, a
concrete scale and discharge screw
that are controlled using a frequency
inverter. Scales or - for gravel - radar
sensors are used to measure
the amount of material in the silos.
to prevent a lot of dust from being
produced, the concrete mixers have
to be equipped with air filters that
automatically remove dust using vibration
equipment. Additionally, it's
necessary to protect the silos from
excessive pressure using sensors.
Transporting gravel
gravel is weighed at the discharge
chute or on the loading conveyor
belt using strain gauge sensors. If
gravel loading trucks are used, they
are controlled by frequency inverters,
end position sensors and safety
end position sensors. gravel loading
silos consists of one or two vibrating
devices that guarantee precise material
loading. In extremely challenging
applications, the gravel quantity in
the loading silo is measured by radar
sensors. If necessary, radar rod sensors
are used to measure the amount
of moisture in the sand. In this way,
the concrete preparation process
can be corrected accordingly using
the measured data.
Water dosing
Water dosing is done using scales
with two control valves. A parallel
dosing flow meter ensures even
more precise dosing.
Adding ingredients
Concrete is produced for specific
purposes and different applications
each with unique characteristics. Today,
producing concrete without any
The control system visualization is
realized via connection to an OPC
server.
The X2X Link connection
used for the
I/O modules ensures
fast data communication.
additives is no longer conceivable.
these are mostly added in small
doses using pumps and scales.
In addition to optimized control procedures,
the B&R automation system
also supports implementation of
safety regulations for concrete mixers.
In this case, control systems not
only have to be able to create reports
and statistics using databases,
they also have to be able to connect
to higher level data systems at the
company.
Remote I/O arrangements reduce
costs
Qel uses X20/X67 System components
to control the new concrete
mixers. the modules are connected
in cabinets on-site. the X2X Link
connection guarantees extremely
fast data communication. An important
advantage is the simple distribution
of input and output modules.
the I/O modules are installed at the
location where they are needed.
Less wiring is required and costs are
reduced considerably.
the connection with the control
system for creating the statistics
and graphics as well as for database
management is made via an ethernet
bus with tCp/Ip protocol. the basis
for this is a pLC with OpC server. A
control system designed in this way
can be expanded without problems
- which results in a high level of flexibility
for the manufacturer.
In most cases, the controller used
for concrete mixers does not only
concentrate on the concrete mixer
itself, it also handles many other devices
that are not directly related to
producing concrete and are included
Qel:
Application
in the total equipment offered at Qel.
these include recycling, heating
gravel and water, thermal insulation,
equipment lighting, etc. Because of
its flexibility and open structures,
B&R technology is well-suited for
optimal integration in the various
systems and can meet various requirements.
Founded: 1994
Employees: 20
Turnover: 2.1 m euR (2007)
Locations: Bardejov (SK)
Products & Services: manufacturing
of electronic equipment for
concrete mixers and lines for concrete
production
www.qel.sk
automotion 07/2009
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