Dings Magnetic Group PERMA DRUM - Manual (Page 2)

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