Disassembling/assembling the screw, Assembling

CONAIR

MARTIN

7.3Disassembling/assembling the screw

7.3.1Disassembling

•Release the cover on the bearing housing.

•Straighten the locking lug on the folding washer and loosen the KM- nut on the clamping ring.

•Tap the KM-nut so that the clamping ring releases from the shaft.

•Lift away the end cover and place an extractor (1) there.

•Screw in the screw (2), which should reach at least 15 mm in the thread in the granulator screw.

•Alternately tighten the lifting screws (3) so that the whole time the extractor is parallel with the end of the cutter housing. To reduce the pulling force, pressure oil can be used as described below.

Disassembling the screw using pressure oil

In the screw shaft close to the worm gear unit there is a plugged hole for connecting to a pressure-oil pump, for example a separate pump to a hydraulic jack. In this way, oil is pumped into the shrinkage fit via an oil duct, which means that considerably less force is required to pull the screw from the gear.

7.3.2Assembling

Before assembling the screw, the shaft and hole should be dry and clean. The shaft is sprayed with Molykote anti-slipping lacqueur.

•Place two 0.2 mm feeler gauges together between the seal-ring and the cutter housing so that the distance between these is 0.4 mm.

•Heat the screw shaft to 225 0C and place it on the gear shaft.

•Cool the screw shaft with cutting fluid until it has cooled down to under 100 0C.

•Release the feeler gauge and fit the end cover.

•The ball bearing is locked in the middle of the bearing housing in axially in such a way that the bearing can take up the axial change as a consequence of the generation of heat in the granulator.

•The bearing is locked on the clamping ring by a KM-nut, which is locked with the folding washer.

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