Cold Jet 2A0388, Руководство оператора

Страница: 8 / 28

SYSTEM DESCRIPTION
The operator manual covers the COMBI PCS 110 DUAL. The main parts are described in the machine
structure section. Operating instructions for add-ons can be found in separate instructions and are not
included in this manual.
Functional Description
The main function of the COMBI PCS 110 DUAL is to produce dry ice pellets from liquid carbon dioxide and
dry ice blasting.
This is performed by a sequence of operations executed by the Beckhoff Panel PC. The Main steps in a
normal application are as follows and refer to the P&I diagram 2A0388, which is available through the
documentation packet or Cold Jet CONNECT.
1. Start up.
2. Production.
3. Blasting.
4. Standby.
5. Emptying.
6. Shutdown.
Production Description 2A0388
At every start-up the hydraulic cylinder =(G01-G1-MO1) for extruder piston is extracted to its max. position
to extrude the CO
2
snow in the chamber in case of an 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 COMBI PCS 110 DUAL. 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-G1-MO2) for the extruder plate changes to the up position – CO
2
in valve =(W01-Q1) and injection
valve =(G01-Q1) will open and purge gaseous CO
2
through the chamber, and the degassing filters and via
degassing pipes to CO
2
out. When the temperature =(W01-TT2) in the liquid CO
2
is -14°C (6.8°F) the
injection will proceed until a timer is reached. Degassing valve =(G01-Q2) on extruder will open to reduce
chamber pressure before hydraulic cylinder =(G01-G1-M01) for extruder piston will extract until fast
forward pressure set point is reached and the hydraulic cylinder will again retract. This will continue until
the plug thickness set point is reached. When the plug thickness is reached the hydraulic cylinder
(G01-G1-M01) for extruder plate changer will move the extruder plate in its down position and production
of dry ice can commence. At start up mode the dry ice cutter =(V1-M1) starts up and the motor is running
continually during production.
In production mode the CO
2
in valve =(W01-Q1) and injection valve =(G1-Q01) will open until a timer is
reached. Degassing valve =(G01-Q2) on the extruder chamber will open to reduce chamber pressure
hydraulic cylinder =(G01-G1-M01) for extruder piston will extract until plug set point is reached and the
hydraulic cylinder will retract again. This cycle will continue until a different step is selected.
COMBI PCS 110 DUAL
Operator’s Manual
Version: 1.0
Page: 7 of 28
Date: 10.05.2021