6.5.5 Logic Control
The control system of the extruder was designed as simple as possible
for the operator. When everything is functioning normally, there is no
need of touching the basic settings and adjustments of the extruder. In a
normal state, the extruder works as one automatic part of the whole process.
The control system has been built up so that all manual extruder
operations needed (e.g. during maintenance and repair) can be carried
out directly from operation control board OS1.
Note! When manual control is used, all lockings are not necessarily
functioning to protect the operator or machines.
Interlocking of machines
The machines on the line just before the extruder (plate feeding conveyors
and plate feeder) and after it (cutter and stacker) affect the extruder
operation. Additionally, the concrete surface level in the feeder hopper
affects the extruder operation. Any malfunction occurring in these machines
stops also the extruder.
The extruder has an automatic detector for gaps between base molds.
The operation of the extruder (screws, vibrators, rollers and mixer) stops,
if a gap between the base molds is detected before the extruder. The
plate feeder conveyors work until the gap is closed.
In automatic operation, the screw drives, the vibrators and the mixer
work as one unit, assuming that also the plate feeder is in automatic operation
(OS3).
Planned operation
Normally the extruder has four operating stages:
- starting
- operating
- finishing
- cleaning
Note! Each work shift must carefully clean the extruder and also other
equipment!
Starting
The starting work steps are to be made before feeding concrete into the
feeder hopper. The extruder is kept in manual operation, and the base
molds coming from the plate feeder are driven through the extruder.The
plate feeder stops when a half of the first base mold has come out of the
extruder
6.5.5 Logic ControlThe control system of the extruder was designed as simple as possiblefor the operator. When everything is functioning normally, there is noneed of touching the basic settings and adjustments of the extruder. In anormal state, the extruder works as one automatic part of the whole process.The control system has been built up so that all manual extruderoperations needed (e.g. during maintenance and repair) can be carriedout directly from operation control board OS1.Note! When manual control is used, all lockings are not necessarilyfunctioning to protect the operator or machines.Interlocking of machinesThe machines on the line just before the extruder (plate feeding conveyorsand plate feeder) and after it (cutter and stacker) affect the extruderoperation. Additionally, the concrete surface level in the feeder hopperaffects the extruder operation. Any malfunction occurring in these machinesstops also the extruder.The extruder has an automatic detector for gaps between base molds.The operation of the extruder (screws, vibrators, rollers and mixer) stops,if a gap between the base molds is detected before the extruder. Theplate feeder conveyors work until the gap is closed.In automatic operation, the screw drives, the vibrators and the mixerwork as one unit, assuming that also the plate feeder is in automatic operation(OS3).Planned operationNormally the extruder has four operating stages:- starting- operating- finishing- cleaningNote! Each work shift must carefully clean the extruder and also otherequipment!StartingThe starting work steps are to be made before feeding concrete into thefeeder hopper. The extruder is kept in manual operation, and the basemolds coming from the plate feeder are driven through the extruder.Theplate feeder stops when a half of the first base mold has come out of theextruder
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