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Pulverizer ZERMA PM
The PM series high speed precision pulverizer are centrifugal mills that are
primarily used for the fine grinding of regrind or primary products for pipe,
profile or sheet extrusion as well as rotomolding.
General description
The ground material (or new material), which is pre-crushed to approx. 6 mm, is fed via a pneumatic dosing chute and finely ground between the stationary and rotating disk. The material has a final fineness of almost 100 % less than or equal to 1 mm.
The centrifugal force, together with a pneumatic suction system carries the material from the grinding area.
Finenesses of less than or equal to 1 mm are achieved. By using an optional screening machine, it is possible to define the maximum upper limit of the final fineness. The adjustable distance between the grinding disks and the use of segments with different corrugations also influence the quality of the ground material.
Discs with diameters of 300, 500 and 800 mm are available.
An automatic cooling system permanently controls the temperature of the material during the grinding process to prevent thermal damage. The maximum temperature of the material
and the amount of water required for cooling are preset.
Options
Rotomoulding in particular is subject to upper limits
with regard to the quality of the regrind. To achieve a max. final fineness 100 % of, for example 0,63 mm, the use of a screening machine is required. The fines that are larger than the upper limit is
returned to the fine mill for a further grinding
process. The return is carried out pneumatically
or (usually) via a screw conveyor.
To protect the sensitive surface of the grinding disks we recommend the use of an upstream all-metal separator. It reliably separates metallic impurities.
ZERMA PM-Details (Peview)
Automatic cooling system
The temperature of the ground material is measured at the outlet of the grinder. If the preset maximum temperature is exceeded, water is vaporized directly into the grinding chamber. In most cases, the temperature of the material drops. If the desired effect is not achieved, the pneumatic dosing chute stops the feed.
Setting the distance between grinding disks
The distance between the stationary and rotating disk is set or checked using a long feeler gauge over 4 control points.
Water injection control valve
The right-hand control valve regulates the
pressure of thewater injection. The flow meter next to it can be used to set the the amount of water to be supplied.
Front door
If required, a water flow cooling system can be connected to the front door for the stator disk (= bottom connection). The upper connection is used for water injection
between the grinding disks.
All information about the PM can be found in the data sheet
Series
PM
| Typ | 300 | 500 | 800 |
|---|---|---|---|
| Disc diameter (mm) | 300 | 500 | 800 |
| Drive (kW) | 22 | 55 | 90 |
| Weight (kg) | 800 | 1800 | 2500 |
| Grinding segments option | – | + | + |
| Stator disk cooling | + | + | + |
| Water injection | + | + | + |
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