IceTech PR350H, Руководство пользователя

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Industrivej 62
DK-6740 Bramming
Denmark
Original
Version: 2.0
IceTech PR350H
User’s manual
Page: 3 of 20
Date: 2017.07.03
Init: JM
SYSTEM DESCRIPTION
This user’s manual covers the IceTech PR350H. The main parts are described in the machine structure section. Operating
instruction for add-ons can be found in separate instructions, and is not included in this manual.
Functional description
The main function of IceTech PR350H is to produce dry ice pellets from liquid carbon dioxide. This is performed by a
sequence of operations executed by the Beckhoff IPC. The main steps in a normal production are as following and refer
to PI diagram P296-1-14201-B for IceTech PR350H:
1. Start up
2. Production
3. Standby
4. Shut down
At every start-up the hydraulic cylinder =G01-G1-MO1 for extruder piston is extracted to its maximum position to extrude
the CO
2
snow in the chamber in case of emergency stop or machine error.
Liquid CO
2
is fed from an external CO
2
tank (not part of this description – see supplier information) through an insulated
pipe to the IceTech PR750H. It is recommended to use a gas separator to eliminate gaseous CO
2
from the liquid CO
2
.
When the hydraulic cylinder =G01-G1-MO1 for extruder piston is retracted and hydraulic cylinder =G01-Q3-MO1 for
extruder plate changer is in middle position - CO
2
In valve =W01-Q1 and Injection valve =G01-Q1 will open and purge
gaseous CO
2
through the chamber, degassing filters and via degassing pipes to CO
2
out. When temperature =W01-TT1 in
the liquid CO2 is -14°C injection will proceed until the timer is reached. The degassing valve =G01-Q5 on the extruder
chamber will open to reduce chamber pressure before the hydraulic cylinder =G01-G1-MO1 for the extruder piston will
extract until fast forward pressure set point is reached and the hydraulic cylinder will again retract. This will continue until
plug thickness set point is reached. When plug thickness is reached the hydraulic cylinder =G01-Q3-MO1 for the extruder
plate changer will move to the selected extruder plate position and production will commence.
In production mode CO
2
In valve =W01-Q1 and the Injection valve =G01-Q1 will open until the timer is reached. The
degassing valve =G01-Q5 on the extruder chamber will open to reduce chamber pressure before the hydraulic cylinder
=G01-G1-MO1 for the extruder piston will extract until plug set point is reached and the hydraulic cylinder will again retract.
This cycle will continue until a different step is selected. During production it is possible to set IceTech PR350H in standby.
When maximum standby time is reached, the IceTech PR350H will run a shutdown sequence.
The shutdown sequence ensures that IceTech PR350H is stopped in a proper position to empty the extruder chamber of
dry ice snow and avoid moisture in the extruder chamber. The hydraulic cylinder =G01-Q3-MO1 for the extruder plate
changer will move to the selected position and the hydraulic cylinder =G01-G1-MO1 for the extruder piston will extract to
maximum position and return to shut down set point position. The hydraulic cylinder =G01-Q3-MO1 for the extruder plate
changer is in the middle position and all valves are closed.