Sacmi CCM001, User Manual

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002AZ001A
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MAINTENANCE
8
8.1.2.4.1 Overhauling the extruder auger
- Remove the plastic compound from the auger chamber with the extruder at its operating temperature. To do this,
carry out a by-pass operation until the plastic compound no longer flows out of the nozzle.
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ATTENTION!
Stop feeding plastic compound to the extruder when cleaning.
- Shut off the machine with the main switch located on the electrical cabinet.
- Install the guide extensions provided.
- Disconnect the pressure transducers (4) with the quick-connect couplers found beneath the extruder mounting
brackets. Unscrew the probe attached to the pump being careful not to twist or bend the transducer cable.
- Take off the cover (10).
- Disconnect the cables (20) from the electrical box with the quick-connect couplers.
- Remove the thermocouple (15) mounted on the nozzle body.
- Take off the covers that protect the connecting tube (14).
- Loosen the screws (13).
- Move the extruder to the end of the guides with the connecting tube attached. Clean up the plastic compound that
flows out of the tube and nozzle as soon as possible.
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ATTENTION!
Move the electrical cables away from under the extruder to avoid cutting them.
- Loosen the nuts (6) and remove the connecting tube. Clean up the plastic compound that flows out of the tube and
nozzle as soon as possible.
- Remove the heating elements (8) by loosening the mounting screw found under the volumetric pump (5).
Loosen the quick-connect coupler and take out thermocouples BT6 and BT7.
- Loosen the screw (9) to loosen the heating element.
- Remove the two screws (7) from the top of the volumetric pump and put in two longer screws passing them through
the eyebolts in the holes left free by screws (7). They are used to lift the pump.
- Loosen the screws (2) and remove the volumetric pump (5). Keep it up with the chains that have hooks attached
to the eyebolts previously installed.
- Remove the extruder filter (3).
- Disconnect the hydraulic lines mounted on the hydraulic motor (21).
- Loosen the screws (11) and remove the hydraulic motor (21).
- Put in the fixture supplied with the extruder, screwing it in the threaded holes in the thrust block (three screws 22
that secure the flange to the thrust block body have to be removed).
- Install the threaded extensions (12) provided with the extruder and tighten it until the auger comes out.
- Loosen the screw of the fixture used to remove the extruder auger (do not remove the plate).
- Clean the auger, filter and extruder chamber as directed below:
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ATTENTION!
This operation is to be performed with the plastic compound at room temperature.
- Thoroughly clean the auger with hand tools, removing the resin sheath. If the surface is opaque and has turned dark,
polish it with brushes and abrasive pastes.
- Clean the inside of the cylinder with a brush, removing any material stuck to the cylinder.
- Thoroughly clean the filter (3). Replace it if worn. To open the filter holes, use a drill bit with 2.3 mm Ø (max.).