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Flexible manufacturing syste,

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									                         MPS – modular production system
            Learning system for automation - The Gifhorn arrangement


1. Description of the function
  Distributing station          Touch Panel for order management
  Sorting station               Distribution center
  Distributing station          Robot station
  Sorting station               Positioning axis with gripper
  Distributing station
  Sorting station




         Picture 2: MPS arrangement of the BBS II Gifhorn




   Picture 1: The MPS concept of Gifhorn
The MPS arrangement represents an industrial plant, from
the order, over the production, up to the distribution. The
system produces small plungers of three different versions,
the red, the black, and the metallic plungers.
At the distributing station first, the different cylinders are
carried by a swiveldrive from a magazin to the subsequent
station. At this station, the separating station, cylinders are     Picture 2: The product. Three
                                                                    versions of plunger
sorted according to the colour and put down on three
different slides.

At the order management you can enter the customer’s order.
A gripper takes the right cylinders and carried them to the
robot- station by a positioning axis.
The robot assembles the cylinder, the piston, the clip and the
cylinder cover.
After assembling, the gripper takes the workpiece and carried
it to the distripution center. The gripper put it on a special
numbered place in the store, the slides 1 – 6.                       Picture 3: Order management


The Distributing Station for teaching the basics

“The Distributing station separates workpieces. Up to eight
workpieces are stored in the magazine tube of the stacking
magazine. A double-acting cylinder pushes the workpieces
out one at a time. The Changer module grips the separated
workpiece via a suction gripper. The swivel arm of the
changer, which is driven by a rotary actuator, moves the
workpiece to the transfer point of the downstream station.

Special technology: Semi-rotary actuator
The Distributing station utilises various actuators, all of which   Picture 4: Distributing station

are industrial components. The rotary actuator of the swivel
                                                     .
arm can be set to various angles between 90° and 270° The end positions are sensed by
means of micro switches. A double-acting linear cylinder pushes workpieces out of the
stacking magazine. The end positions are sensed using proximity sensors.
Special grippers: Suction gripper
The suction gripper of the Changer module grips the workpiece. The vacuum is generated in
the vacuum slice of the CP valve terminal by means of the venturi principle and is monitored
by a pressure switch. The switching point of the pressure switch is adjustable.”
(www.festo-didactic.com)




2. Didactic thoughts

The MPS arrangement of the BBS II Gifhorn comprehends some special didactic thoughts.


Diffrent technologies
We are able to teach different technologies with our MPS. The different station are
programmed with programmable controller. We used the Siemens program Step 7 with
continious function chart. It is also possible to network with AS Interface on the sensor- actor
level or to network with PROFIBUS between the controllers of the different stations.


Modular composition
The modular character of the MPS offers us to teach automation from the basics to higher
qualification. At first we begin only with the distributing station. After that we are able to make
it more complex when we connect the distributing station with the sorting station. At special
themes we can teach robotics and the positioning axis. At last we can have a look at the
whole MPS under the aspect of the network.
Because of this modular arrangement we are able to use the MPS for diffrent grades of
apprentice and also for diffrent professions like mechanics or electricians.


Learning by doing
The distributing station is ordered pluggable, so the
studendts are able to build the System by their own.
They have to create the technical documentation,
they have to place sensors and actors and they
have to program by their own. From the beginning
they have to learn by their own fault.


Work- same assignement
                                                           Picture 3: Student are building the distributing
                                                           station
Work-same assignement


In order to organize the learning process effectively we arranged the system with many
stations, which are identical in construction. We ordered the distributing station six times,
because we need it for the basics. The sorting station we ordered three times for the
connecting with the distributing station for the constitutive learning process.

								
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