Dings Magnetic Group PERMA DRUM User Manual

BULLETIN NO. 1121F

DATE: 05/13

PERMA DRUM

INSTRUCTIONS

DESCRIPTION

The Perma Drum is a self-cleaning permanent magnet type
magnetic separator. It’s designed to protect processing machinery
against damage from tramp iron, and to protect processed materials
against ferrous metal impurities.

The Perma Drum operates with a motor driven stainless steel shell
that revolves around a stationary internal magnet assembly. Material
to be separated is fed against the shell. Magnetics in the feed are
attracted to the shell, and held against it until reaching a discharge
location. Here the separated magnetics are automatically released.

This type separator is manufactured in 2 models. One, the Type PC,
includes the magnetic drum, but not a housing or drive motor. The
other model is the Type FC. It does include a housing and a drive
motor with the magnetic drum.

IMPORTANT

This installation bulletin has 2 sections. Section 1 covers the Type
PC only. Section 2 covers the Type FC only. Read Section 1 before
installing a Type PC. Read Sections 1 and 2 before installing a
Type FC.

OPERATING TEMPERATURE

• Operating temperature for ceramic magnets is -40°F through 250°F

(-40°C through 120°C).

• Operating temperature for rare earth magnets is 176°F (80°C) or less.

NOTE: Extreme temperatures may affect the performance of the
magnet. Refer to Bulletin 1214T.

SECTION 1

MOUNTING - TYPE PC

Check all packaged material for shortage of parts and possible
damage. Report shortages or damage to the delivering carrier.
Use care in uncrating to avoid damage.

The Type PC is shipped fully assembled and ready for mounting.
Mount it by supporting it on the drive side (the keyway in shaft side)
with a pillow block bearing, and on the opposite side with a shaft
clamp.

The pillow block bearing allows the drive side shaft to turn, and
the drum shell to revolve around the stationary internal magnet
assembly. The shaft clamp holds the internal magnet assembly in
place. A pillow block bearing and a shaft clamp are optional items
available from Dings.

ADJUSTMENT OF MAGNETIC ARC -TYPE PC

After the drum is mounted, adjust the position of the magnetic arc,
as shown in Figure 2. This is done by adjusting the location of the
internal magnet assembly, using a steel rod to turn the shaft. Insert
the rod into the hole that’s in the shaft extension on the non-drive
side. Move the rod to rotate the magnet assembly upward until you
can feel the magnetism in the strongest part of the magnetic arc at
the 3 o’clock position. Then, hold the rod in place and tighten the
shaft clamp.

4740 W. Electric Ave. s Milwaukee, WI 53219 s 414/672-7830 s 414/672-5354 Fax s www.dingsmagnets.com

TYPE PC PERMA DRUM

TYPE FC PERMA DRUM

Figure 1

FEED CHUTE -TYPE PC

The drum should be fed at the 12 o’clock position. Feed material
will be carried through the magnetic arc by the rotating shell.
Nonmagnetic material in the feed will fall away from the shell in a
normal trajectory. Magnetic objects in the feed will be attracted
against the shell, and held in place until carried past the influence
of the magnetic field (past the magnetic arc).

Figure 3 shows the arrangement of feed and the separating actions.
It also shows that a typical installation needs a feed chute, a feed
leveler and a splitter plate. These items must be provided for, and
installed by the user of a Type PC Drum.

Make a feed chute out of nonmagnetic metal. It should be the same
width as the drum shell. Locate it where shown in Figure 3. Keep
the lower edge close to the shell. The gap should be as small as
possible.

FEED LEVELER -TYPE PC

An adjustable feed leveler plate is needed to regulate the depth
of feed material passing over the drum. It will keep the feed rate
consistent. It should be made from nonmagnetic metal, and be the
same width as the drum shell. Locate it where shown in Figure 3.
Install it so that the gap between its edge and the shell can be
adjusted, and locked at a desired setting.

The leveler will keep the flow of feed at a uniform depth across
the shell for good separating performance. Do not set the leveler
gap greater than necessary for best efficiency. Magnetics are more
easily separated from a thin burden than from a thick burden. Do
not operate with a gap that is so narrow it causes plugging.

Density of the feed material can affect the gap setting. The gap is
usually narrower on dense, compact material than on light, loosely
packed material. Find the best setting from trial settings when

material is being fed to the drum.

SPLITTER PLATE -TYPE PC

An adjustable splitter plate is needed to keep the nonmagnetic and
magnetic products separated when these products are discharged
off the drum. This plate should be made from nonmagnetic metal,
and be the same width as the drum shell. Locate it where shown in
Figure 3.

Install it so that the splitting edge can be moved towards and away
from the shell. The closer this edge is to the drum, the cleaner the
magnetic product will be (less nonmagnetic material in the magnetic
product). However, in some applications, this can mean some loss
of magnetic product with nonmagnetic product. The opposite can
happen when the splitting edge is moved away from the drum. The
correct setting will depend upon whether a clean magnetic or a
clean nonmagnetic product is desired. In some applications, some
amount of contamination of one product into the other cannot be
avoided. Find the best setting from trial settings when material is
being fed to the drum.

ARRANGEMENT OF DRIVE -TYPE PC

The Type PC can be driven by several means - by pulley (sheave)
and V-belt, by sprocket and chain, or by direct drive off a
motor/reducer with a coupling connecting the drive and drum shaft.

Recommended drum speeds are:

12” dia. drum - 48 to 64 RPM
18” dia. drum - 31 to 42 RPM

24” dia. drum - 24 to 32 RPM
All speeds above convert to a peripheral drum speed of 150 to 200
FPM. Speeds exceeding this range may result in poor separating
performance.

MAINTENANCE -TYPE PC

Two cartridge bearings should be lubricated periodically, using
fittings provided. Use a lithium base grease conforming to NLGI
Grade #2. A schedule of lubrication can be in accordance with a
schedule for other equipment in the area.

Watch for excessive wear on the drum shell. Replace it when
wear becomes excessive. If your feed material is highly abrasive,
consider a replaceable stainless steel wear cover, available from
the Dings Company.

Figure 2

Figure 3